X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng-sessiond%2Fmain.c;h=de95fad311fa0c0c09fdb7a0b0bcf9793edcef9d;hp=1fbfb1b0549383cd77e5334aad25338320cb6d56;hb=e534f206492213fddf8c45012dd6a03c0b6d858d;hpb=4ec029ed8d032ac98d8dc158a751841b7c150639

diff --git a/src/bin/lttng-sessiond/main.c b/src/bin/lttng-sessiond/main.c
index 1fbfb1b05..de95fad31 100644
--- a/src/bin/lttng-sessiond/main.c
+++ b/src/bin/lttng-sessiond/main.c
@@ -1,20 +1,10 @@
 /*
- * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
- *                      Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *               2013 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
+ * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
+ * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ * Copyright (C) 2013 Jérémie Galarneau <jeremie.galarneau@efficios.com>
  *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License, version 2 only,
- * as published by the Free Software Foundation.
+ * SPDX-License-Identifier: GPL-2.0-only
  *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
 #define _LGPL_SOURCE
@@ -59,23 +49,21 @@
 #include "consumer.h"
 #include "context.h"
 #include "event.h"
+#include "event-notifier-error-accounting.h"
 #include "kernel.h"
 #include "kernel-consumer.h"
-#include "modprobe.h"
-#include "shm.h"
-#include "ust-ctl.h"
+#include "lttng-ust-ctl.h"
 #include "ust-consumer.h"
 #include "utils.h"
 #include "fd-limit.h"
 #include "health-sessiond.h"
 #include "testpoint.h"
-#include "ust-thread.h"
+#include "notify-apps.h"
 #include "agent-thread.h"
 #include "save.h"
 #include "notification-thread.h"
 #include "notification-thread-commands.h"
 #include "rotation-thread.h"
-#include "lttng-syscall.h"
 #include "agent.h"
 #include "ht-cleanup.h"
 #include "sessiond-config.h"
@@ -86,6 +74,7 @@
 #include "register.h"
 #include "manage-apps.h"
 #include "manage-kernel.h"
+#include "modprobe.h"
 
 static const char *help_msg =
 #ifdef LTTNG_EMBED_HELP
@@ -95,8 +84,18 @@ NULL
 #endif
 ;
 
+#define EVENT_NOTIFIER_ERROR_COUNTER_NUMBER_OF_BUCKET_MAX 65535
+#define EVENT_NOTIFIER_ERROR_BUFFER_SIZE_BASE_OPTION_STR \
+		"event-notifier-error-buffer-size"
+#define EVENT_NOTIFIER_ERROR_BUFFER_SIZE_KERNEL_OPTION_STR \
+		EVENT_NOTIFIER_ERROR_BUFFER_SIZE_BASE_OPTION_STR "-kernel"
+#define EVENT_NOTIFIER_ERROR_BUFFER_SIZE_USERSPACE_OPTION_STR \
+		EVENT_NOTIFIER_ERROR_BUFFER_SIZE_BASE_OPTION_STR "-userspace"
+
+
 const char *progname;
 static int lockfile_fd = -1;
+static int opt_print_version;
 
 /* Set to 1 when a SIGUSR1 signal is received. */
 static int recv_child_signal;
@@ -131,6 +130,8 @@ static const struct option long_options[] = {
 	{ "load", required_argument, 0, 'l' },
 	{ "kmod-probes", required_argument, 0, '\0' },
 	{ "extra-kmod-probes", required_argument, 0, '\0' },
+	{ EVENT_NOTIFIER_ERROR_BUFFER_SIZE_KERNEL_OPTION_STR, required_argument, 0, '\0' },
+	{ EVENT_NOTIFIER_ERROR_BUFFER_SIZE_USERSPACE_OPTION_STR, required_argument, 0, '\0' },
 	{ NULL, 0, 0, 0 }
 };
 
@@ -155,8 +156,6 @@ static int apps_cmd_notify_pipe[2] = { -1, -1 };
  */
 static struct ust_cmd_queue ust_cmd_queue;
 
-static const char *module_proc_lttng = "/proc/lttng";
-
 /*
  * Section name to look for in the daemon configuration file.
  */
@@ -187,56 +186,56 @@ static void close_consumer_sockets(void)
 {
 	int ret;
 
-	if (kconsumer_data.err_sock >= 0) {
-		ret = close(kconsumer_data.err_sock);
+	if (the_kconsumer_data.err_sock >= 0) {
+		ret = close(the_kconsumer_data.err_sock);
 		if (ret < 0) {
 			PERROR("kernel consumer err_sock close");
 		}
 	}
-	if (ustconsumer32_data.err_sock >= 0) {
-		ret = close(ustconsumer32_data.err_sock);
+	if (the_ustconsumer32_data.err_sock >= 0) {
+		ret = close(the_ustconsumer32_data.err_sock);
 		if (ret < 0) {
 			PERROR("UST consumerd32 err_sock close");
 		}
 	}
-	if (ustconsumer64_data.err_sock >= 0) {
-		ret = close(ustconsumer64_data.err_sock);
+	if (the_ustconsumer64_data.err_sock >= 0) {
+		ret = close(the_ustconsumer64_data.err_sock);
 		if (ret < 0) {
 			PERROR("UST consumerd64 err_sock close");
 		}
 	}
-	if (kconsumer_data.cmd_sock >= 0) {
-		ret = close(kconsumer_data.cmd_sock);
+	if (the_kconsumer_data.cmd_sock >= 0) {
+		ret = close(the_kconsumer_data.cmd_sock);
 		if (ret < 0) {
 			PERROR("kernel consumer cmd_sock close");
 		}
 	}
-	if (ustconsumer32_data.cmd_sock >= 0) {
-		ret = close(ustconsumer32_data.cmd_sock);
+	if (the_ustconsumer32_data.cmd_sock >= 0) {
+		ret = close(the_ustconsumer32_data.cmd_sock);
 		if (ret < 0) {
 			PERROR("UST consumerd32 cmd_sock close");
 		}
 	}
-	if (ustconsumer64_data.cmd_sock >= 0) {
-		ret = close(ustconsumer64_data.cmd_sock);
+	if (the_ustconsumer64_data.cmd_sock >= 0) {
+		ret = close(the_ustconsumer64_data.cmd_sock);
 		if (ret < 0) {
 			PERROR("UST consumerd64 cmd_sock close");
 		}
 	}
-	if (kconsumer_data.channel_monitor_pipe >= 0) {
-		ret = close(kconsumer_data.channel_monitor_pipe);
+	if (the_kconsumer_data.channel_monitor_pipe >= 0) {
+		ret = close(the_kconsumer_data.channel_monitor_pipe);
 		if (ret < 0) {
 			PERROR("kernel consumer channel monitor pipe close");
 		}
 	}
-	if (ustconsumer32_data.channel_monitor_pipe >= 0) {
-		ret = close(ustconsumer32_data.channel_monitor_pipe);
+	if (the_ustconsumer32_data.channel_monitor_pipe >= 0) {
+		ret = close(the_ustconsumer32_data.channel_monitor_pipe);
 		if (ret < 0) {
 			PERROR("UST consumerd32 channel monitor pipe close");
 		}
 	}
-	if (ustconsumer64_data.channel_monitor_pipe >= 0) {
-		ret = close(ustconsumer64_data.channel_monitor_pipe);
+	if (the_ustconsumer64_data.channel_monitor_pipe >= 0) {
+		ret = close(the_ustconsumer64_data.channel_monitor_pipe);
 		if (ret < 0) {
 			PERROR("UST consumerd64 channel monitor pipe close");
 		}
@@ -287,72 +286,65 @@ static void sessiond_cleanup(void)
 	sessiond_close_quit_pipe();
 	utils_close_pipe(apps_cmd_pipe);
 	utils_close_pipe(apps_cmd_notify_pipe);
-	utils_close_pipe(kernel_poll_pipe);
+	utils_close_pipe(the_kernel_poll_pipe);
 
-	ret = remove(config.pid_file_path.value);
+	ret = remove(the_config.pid_file_path.value);
 	if (ret < 0) {
-		PERROR("remove pidfile %s", config.pid_file_path.value);
+		PERROR("remove pidfile %s", the_config.pid_file_path.value);
 	}
 
 	DBG("Removing sessiond and consumerd content of directory %s",
-		config.rundir.value);
+			the_config.rundir.value);
 
 	/* sessiond */
-	DBG("Removing %s", config.pid_file_path.value);
-	(void) unlink(config.pid_file_path.value);
+	DBG("Removing %s", the_config.pid_file_path.value);
+	(void) unlink(the_config.pid_file_path.value);
 
-	DBG("Removing %s", config.agent_port_file_path.value);
-	(void) unlink(config.agent_port_file_path.value);
+	DBG("Removing %s", the_config.agent_port_file_path.value);
+	(void) unlink(the_config.agent_port_file_path.value);
 
 	/* kconsumerd */
-	DBG("Removing %s", kconsumer_data.err_unix_sock_path);
-	(void) unlink(kconsumer_data.err_unix_sock_path);
+	DBG("Removing %s", the_kconsumer_data.err_unix_sock_path);
+	(void) unlink(the_kconsumer_data.err_unix_sock_path);
 
-	DBG("Removing directory %s", config.kconsumerd_path.value);
-	(void) rmdir(config.kconsumerd_path.value);
+	DBG("Removing directory %s", the_config.kconsumerd_path.value);
+	(void) rmdir(the_config.kconsumerd_path.value);
 
 	/* ust consumerd 32 */
-	DBG("Removing %s", config.consumerd32_err_unix_sock_path.value);
-	(void) unlink(config.consumerd32_err_unix_sock_path.value);
+	DBG("Removing %s", the_config.consumerd32_err_unix_sock_path.value);
+	(void) unlink(the_config.consumerd32_err_unix_sock_path.value);
 
-	DBG("Removing directory %s", config.consumerd32_path.value);
-	(void) rmdir(config.consumerd32_path.value);
+	DBG("Removing directory %s", the_config.consumerd32_path.value);
+	(void) rmdir(the_config.consumerd32_path.value);
 
 	/* ust consumerd 64 */
-	DBG("Removing %s", config.consumerd64_err_unix_sock_path.value);
-	(void) unlink(config.consumerd64_err_unix_sock_path.value);
+	DBG("Removing %s", the_config.consumerd64_err_unix_sock_path.value);
+	(void) unlink(the_config.consumerd64_err_unix_sock_path.value);
 
-	DBG("Removing directory %s", config.consumerd64_path.value);
-	(void) rmdir(config.consumerd64_path.value);
+	DBG("Removing directory %s", the_config.consumerd64_path.value);
+	(void) rmdir(the_config.consumerd64_path.value);
 
 	pthread_mutex_destroy(&session_list->lock);
 
-	wait_consumer(&kconsumer_data);
-	wait_consumer(&ustconsumer64_data);
-	wait_consumer(&ustconsumer32_data);
+	DBG("Cleaning up all per-event notifier domain agents");
+	agent_by_event_notifier_domain_ht_destroy();
 
 	DBG("Cleaning up all agent apps");
 	agent_app_ht_clean();
-
 	DBG("Closing all UST sockets");
 	ust_app_clean_list();
 	buffer_reg_destroy_registries();
 
-	if (is_root && !config.no_kernel) {
-		DBG2("Closing kernel fd");
-		if (kernel_tracer_fd >= 0) {
-			ret = close(kernel_tracer_fd);
-			if (ret) {
-				PERROR("close");
-			}
-		}
-		DBG("Unloading kernel modules");
-		modprobe_remove_lttng_all();
-		free(syscall_table);
-	}
-
 	close_consumer_sockets();
 
+	wait_consumer(&the_kconsumer_data);
+	wait_consumer(&the_ustconsumer64_data);
+	wait_consumer(&the_ustconsumer32_data);
+
+	if (is_root && !the_config.no_kernel) {
+		cleanup_kernel_tracer();
+	}
+
 	/*
 	 * We do NOT rmdir rundir because there are other processes
 	 * using it, for instance lttng-relayd, which can start in
@@ -367,86 +359,11 @@ static void sessiond_cleanup_options(void)
 {
 	DBG("Cleaning up options");
 
-	sessiond_config_fini(&config);
+	sessiond_config_fini(&the_config);
 
 	run_as_destroy_worker();
 }
 
-/*
- * Setup necessary data for kernel tracer action.
- */
-static int init_kernel_tracer(void)
-{
-	int ret;
-
-	/* Modprobe lttng kernel modules */
-	ret = modprobe_lttng_control();
-	if (ret < 0) {
-		goto error;
-	}
-
-	/* Open debugfs lttng */
-	kernel_tracer_fd = open(module_proc_lttng, O_RDWR);
-	if (kernel_tracer_fd < 0) {
-		DBG("Failed to open %s", module_proc_lttng);
-		goto error_open;
-	}
-
-	/* Validate kernel version */
-	ret = kernel_validate_version(kernel_tracer_fd, &kernel_tracer_version,
-			&kernel_tracer_abi_version);
-	if (ret < 0) {
-		goto error_version;
-	}
-
-	ret = modprobe_lttng_data();
-	if (ret < 0) {
-		goto error_modules;
-	}
-
-	ret = kernel_supports_ring_buffer_snapshot_sample_positions(
-			kernel_tracer_fd);
-	if (ret < 0) {
-		goto error_modules;
-	}
-
-	if (ret < 1) {
-		WARN("Kernel tracer does not support buffer monitoring. "
-			"The monitoring timer of channels in the kernel domain "
-			"will be set to 0 (disabled).");
-	}
-
-	DBG("Kernel tracer fd %d", kernel_tracer_fd);
-	return 0;
-
-error_version:
-	modprobe_remove_lttng_control();
-	ret = close(kernel_tracer_fd);
-	if (ret) {
-		PERROR("close");
-	}
-	kernel_tracer_fd = -1;
-	return LTTNG_ERR_KERN_VERSION;
-
-error_modules:
-	ret = close(kernel_tracer_fd);
-	if (ret) {
-		PERROR("close");
-	}
-
-error_open:
-	modprobe_remove_lttng_control();
-
-error:
-	WARN("No kernel tracer available");
-	kernel_tracer_fd = -1;
-	if (!is_root) {
-		return LTTNG_ERR_NEED_ROOT_SESSIOND;
-	} else {
-		return LTTNG_ERR_KERN_NA;
-	}
-}
-
 static int string_match(const char *str1, const char *str2)
 {
 	return (str1 && str2) && !strcmp(str1, str2);
@@ -471,9 +388,9 @@ static int set_option(int opt, const char *arg, const char *optname)
 			WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
 				"-c, --client-sock");
 		} else {
-			config_string_set(&config.client_unix_sock_path,
+			config_string_set(&the_config.client_unix_sock_path,
 					strdup(arg));
-			if (!config.client_unix_sock_path.value) {
+			if (!the_config.client_unix_sock_path.value) {
 				ret = -ENOMEM;
 				PERROR("strdup");
 			}
@@ -487,17 +404,17 @@ static int set_option(int opt, const char *arg, const char *optname)
 			WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
 				"-a, --apps-sock");
 		} else {
-			config_string_set(&config.apps_unix_sock_path,
+			config_string_set(&the_config.apps_unix_sock_path,
 					strdup(arg));
-			if (!config.apps_unix_sock_path.value) {
+			if (!the_config.apps_unix_sock_path.value) {
 				ret = -ENOMEM;
 				PERROR("strdup");
 			}
 		}
 	} else if (string_match(optname, "daemonize") || opt == 'd') {
-		config.daemonize = true;
+		the_config.daemonize = true;
 	} else if (string_match(optname, "background") || opt == 'b') {
-		config.background = true;
+		the_config.background = true;
 	} else if (string_match(optname, "group") || opt == 'g') {
 		if (!arg || *arg == '\0') {
 			ret = -EINVAL;
@@ -507,9 +424,9 @@ static int set_option(int opt, const char *arg, const char *optname)
 			WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
 				"-g, --group");
 		} else {
-			config_string_set(&config.tracing_group_name,
+			config_string_set(&the_config.tracing_group_name,
 					strdup(arg));
-			if (!config.tracing_group_name.value) {
+			if (!the_config.tracing_group_name.value) {
 				ret = -ENOMEM;
 				PERROR("strdup");
 			}
@@ -522,10 +439,9 @@ static int set_option(int opt, const char *arg, const char *optname)
 		}
 		exit(ret ? EXIT_FAILURE : EXIT_SUCCESS);
 	} else if (string_match(optname, "version") || opt == 'V') {
-		fprintf(stdout, "%s\n", VERSION);
-		exit(EXIT_SUCCESS);
+		opt_print_version = 1;
 	} else if (string_match(optname, "sig-parent") || opt == 'S') {
-		config.sig_parent = true;
+		the_config.sig_parent = true;
 	} else if (string_match(optname, "kconsumerd-err-sock")) {
 		if (!arg || *arg == '\0') {
 			ret = -EINVAL;
@@ -535,9 +451,10 @@ static int set_option(int opt, const char *arg, const char *optname)
 			WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
 				"--kconsumerd-err-sock");
 		} else {
-			config_string_set(&config.kconsumerd_err_unix_sock_path,
+			config_string_set(
+					&the_config.kconsumerd_err_unix_sock_path,
 					strdup(arg));
-			if (!config.kconsumerd_err_unix_sock_path.value) {
+			if (!the_config.kconsumerd_err_unix_sock_path.value) {
 				ret = -ENOMEM;
 				PERROR("strdup");
 			}
@@ -551,9 +468,10 @@ static int set_option(int opt, const char *arg, const char *optname)
 			WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
 				"--kconsumerd-cmd-sock");
 		} else {
-			config_string_set(&config.kconsumerd_cmd_unix_sock_path,
+			config_string_set(
+					&the_config.kconsumerd_cmd_unix_sock_path,
 					strdup(arg));
-			if (!config.kconsumerd_cmd_unix_sock_path.value) {
+			if (!the_config.kconsumerd_cmd_unix_sock_path.value) {
 				ret = -ENOMEM;
 				PERROR("strdup");
 			}
@@ -567,9 +485,10 @@ static int set_option(int opt, const char *arg, const char *optname)
 			WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
 				"--ustconsumerd64-err-sock");
 		} else {
-			config_string_set(&config.consumerd64_err_unix_sock_path,
+			config_string_set(
+					&the_config.consumerd64_err_unix_sock_path,
 					strdup(arg));
-			if (!config.consumerd64_err_unix_sock_path.value) {
+			if (!the_config.consumerd64_err_unix_sock_path.value) {
 				ret = -ENOMEM;
 				PERROR("strdup");
 			}
@@ -583,9 +502,10 @@ static int set_option(int opt, const char *arg, const char *optname)
 			WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
 				"--ustconsumerd64-cmd-sock");
 		} else {
-			config_string_set(&config.consumerd64_cmd_unix_sock_path,
+			config_string_set(
+					&the_config.consumerd64_cmd_unix_sock_path,
 					strdup(arg));
-			if (!config.consumerd64_cmd_unix_sock_path.value) {
+			if (!the_config.consumerd64_cmd_unix_sock_path.value) {
 				ret = -ENOMEM;
 				PERROR("strdup");
 			}
@@ -599,9 +519,10 @@ static int set_option(int opt, const char *arg, const char *optname)
 			WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
 				"--ustconsumerd32-err-sock");
 		} else {
-			config_string_set(&config.consumerd32_err_unix_sock_path,
+			config_string_set(
+					&the_config.consumerd32_err_unix_sock_path,
 					strdup(arg));
-			if (!config.consumerd32_err_unix_sock_path.value) {
+			if (!the_config.consumerd32_err_unix_sock_path.value) {
 				ret = -ENOMEM;
 				PERROR("strdup");
 			}
@@ -615,34 +536,37 @@ static int set_option(int opt, const char *arg, const char *optname)
 			WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
 				"--ustconsumerd32-cmd-sock");
 		} else {
-			config_string_set(&config.consumerd32_cmd_unix_sock_path,
+			config_string_set(
+					&the_config.consumerd32_cmd_unix_sock_path,
 					strdup(arg));
-			if (!config.consumerd32_cmd_unix_sock_path.value) {
+			if (!the_config.consumerd32_cmd_unix_sock_path.value) {
 				ret = -ENOMEM;
 				PERROR("strdup");
 			}
 		}
 	} else if (string_match(optname, "no-kernel")) {
-		config.no_kernel = true;
+		the_config.no_kernel = true;
 	} else if (string_match(optname, "quiet") || opt == 'q') {
-		config.quiet = true;
+		the_config.quiet = true;
 	} else if (string_match(optname, "verbose") || opt == 'v') {
 		/* Verbose level can increase using multiple -v */
 		if (arg) {
 			/* Value obtained from config file */
-			config.verbose = config_parse_value(arg);
+			the_config.verbose = config_parse_value(arg);
 		} else {
 			/* -v used on command line */
-			config.verbose++;
+			the_config.verbose++;
 		}
 		/* Clamp value to [0, 3] */
-		config.verbose = config.verbose < 0 ? 0 :
-			(config.verbose <= 3 ? config.verbose : 3);
+		the_config.verbose = the_config.verbose < 0 ?
+				      0 :
+				      (the_config.verbose <= 3 ? the_config.verbose :
+								 3);
 	} else if (string_match(optname, "verbose-consumer")) {
 		if (arg) {
-			config.verbose_consumer = config_parse_value(arg);
+			the_config.verbose_consumer = config_parse_value(arg);
 		} else {
-			config.verbose_consumer++;
+			the_config.verbose_consumer++;
 		}
 	} else if (string_match(optname, "consumerd32-path")) {
 		if (!arg || *arg == '\0') {
@@ -653,9 +577,9 @@ static int set_option(int opt, const char *arg, const char *optname)
 			WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
 				"--consumerd32-path");
 		} else {
-			config_string_set(&config.consumerd32_bin_path,
+			config_string_set(&the_config.consumerd32_bin_path,
 					strdup(arg));
-			if (!config.consumerd32_bin_path.value) {
+			if (!the_config.consumerd32_bin_path.value) {
 				PERROR("strdup");
 				ret = -ENOMEM;
 			}
@@ -669,9 +593,9 @@ static int set_option(int opt, const char *arg, const char *optname)
 			WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
 				"--consumerd32-libdir");
 		} else {
-			config_string_set(&config.consumerd32_lib_dir,
+			config_string_set(&the_config.consumerd32_lib_dir,
 					strdup(arg));
-			if (!config.consumerd32_lib_dir.value) {
+			if (!the_config.consumerd32_lib_dir.value) {
 				PERROR("strdup");
 				ret = -ENOMEM;
 			}
@@ -685,9 +609,9 @@ static int set_option(int opt, const char *arg, const char *optname)
 			WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
 				"--consumerd64-path");
 		} else {
-			config_string_set(&config.consumerd64_bin_path,
+			config_string_set(&the_config.consumerd64_bin_path,
 					strdup(arg));
-			if (!config.consumerd64_bin_path.value) {
+			if (!the_config.consumerd64_bin_path.value) {
 				PERROR("strdup");
 				ret = -ENOMEM;
 			}
@@ -701,9 +625,9 @@ static int set_option(int opt, const char *arg, const char *optname)
 			WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
 				"--consumerd64-libdir");
 		} else {
-			config_string_set(&config.consumerd64_lib_dir,
+			config_string_set(&the_config.consumerd64_lib_dir,
 					strdup(arg));
-			if (!config.consumerd64_lib_dir.value) {
+			if (!the_config.consumerd64_lib_dir.value) {
 				PERROR("strdup");
 				ret = -ENOMEM;
 			}
@@ -717,8 +641,9 @@ static int set_option(int opt, const char *arg, const char *optname)
 			WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
 				"-p, --pidfile");
 		} else {
-			config_string_set(&config.pid_file_path, strdup(arg));
-			if (!config.pid_file_path.value) {
+			config_string_set(
+					&the_config.pid_file_path, strdup(arg));
+			if (!the_config.pid_file_path.value) {
 				PERROR("strdup");
 				ret = -ENOMEM;
 			}
@@ -744,7 +669,8 @@ static int set_option(int opt, const char *arg, const char *optname)
 				ERR("Port overflow in --agent-tcp-port parameter: %s", arg);
 				return -1;
 			}
-			config.agent_tcp_port.begin = config.agent_tcp_port.end = (int) v;
+			the_config.agent_tcp_port.begin =
+					the_config.agent_tcp_port.end = (int) v;
 			DBG3("Agent TCP port set to non default: %i", (int) v);
 		}
 	} else if (string_match(optname, "load") || opt == 'l') {
@@ -756,8 +682,9 @@ static int set_option(int opt, const char *arg, const char *optname)
 			WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
 				"-l, --load");
 		} else {
-		        config_string_set(&config.load_session_path, strdup(arg));
-			if (!config.load_session_path.value) {
+			config_string_set(&the_config.load_session_path,
+					strdup(arg));
+			if (!the_config.load_session_path.value) {
 				PERROR("strdup");
 				ret = -ENOMEM;
 			}
@@ -771,8 +698,9 @@ static int set_option(int opt, const char *arg, const char *optname)
 			WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
 				"--kmod-probes");
 		} else {
-			config_string_set(&config.kmod_probes_list, strdup(arg));
-			if (!config.kmod_probes_list.value) {
+			config_string_set(&the_config.kmod_probes_list,
+					strdup(arg));
+			if (!the_config.kmod_probes_list.value) {
 				PERROR("strdup");
 				ret = -ENOMEM;
 			}
@@ -786,13 +714,51 @@ static int set_option(int opt, const char *arg, const char *optname)
 			WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
 				"--extra-kmod-probes");
 		} else {
-			config_string_set(&config.kmod_extra_probes_list,
+			config_string_set(&the_config.kmod_extra_probes_list,
 					strdup(arg));
-			if (!config.kmod_extra_probes_list.value) {
+			if (!the_config.kmod_extra_probes_list.value) {
 				PERROR("strdup");
 				ret = -ENOMEM;
 			}
 		}
+	} else if (string_match(optname, EVENT_NOTIFIER_ERROR_BUFFER_SIZE_KERNEL_OPTION_STR)) {
+		unsigned long v;
+
+		errno = 0;
+		v = strtoul(arg, NULL, 0);
+		if (errno != 0 || !isdigit(arg[0])) {
+			ERR("Wrong value in --%s parameter: %s",
+					EVENT_NOTIFIER_ERROR_BUFFER_SIZE_KERNEL_OPTION_STR, arg);
+			return -1;
+		}
+		if (v == 0 || v >= EVENT_NOTIFIER_ERROR_COUNTER_NUMBER_OF_BUCKET_MAX) {
+			ERR("Value out of range for --%s parameter: %s",
+					EVENT_NOTIFIER_ERROR_BUFFER_SIZE_KERNEL_OPTION_STR, arg);
+			return -1;
+		}
+		the_config.event_notifier_buffer_size_kernel = (int) v;
+		DBG3("Number of event notifier error buffer kernel size to non default: %i",
+				the_config.event_notifier_buffer_size_kernel);
+		goto end;
+	} else if (string_match(optname, EVENT_NOTIFIER_ERROR_BUFFER_SIZE_USERSPACE_OPTION_STR)) {
+		unsigned long v;
+
+		errno = 0;
+		v = strtoul(arg, NULL, 0);
+		if (errno != 0 || !isdigit(arg[0])) {
+			ERR("Wrong value in --%s parameter: %s",
+					EVENT_NOTIFIER_ERROR_BUFFER_SIZE_USERSPACE_OPTION_STR, arg);
+			return -1;
+		}
+		if (v == 0 || v >= EVENT_NOTIFIER_ERROR_COUNTER_NUMBER_OF_BUCKET_MAX) {
+			ERR("Value out of range for --%s parameter: %s",
+					EVENT_NOTIFIER_ERROR_BUFFER_SIZE_USERSPACE_OPTION_STR, arg);
+			return -1;
+		}
+		the_config.event_notifier_buffer_size_userspace = (int) v;
+		DBG3("Number of event notifier error buffer userspace size to non default: %i",
+				the_config.event_notifier_buffer_size_userspace);
+		goto end;
 	} else if (string_match(optname, "config") || opt == 'f') {
 		/* This is handled in set_options() thus silent skip. */
 		goto end;
@@ -878,6 +844,10 @@ end:
 	return ret;
 }
 
+static void print_version(void) {
+	fprintf(stdout, "%s\n", VERSION);
+}
+
 /*
  * daemon configuration loading and argument parsing
  */
@@ -964,7 +934,7 @@ end:
  */
 static int create_lockfile(void)
 {
-        return utils_create_lock_file(config.lock_file_path.value);
+	return utils_create_lock_file(the_config.lock_file_path.value);
 }
 
 /*
@@ -1001,7 +971,7 @@ static void sessiond_cleanup_lock_file(void)
 	 * release the file system lock.
 	 */
 	if (lockfile_fd >= 0) {
-		ret = remove(config.lock_file_path.value);
+		ret = remove(the_config.lock_file_path.value);
 		if (ret < 0) {
 			PERROR("remove lock file");
 		}
@@ -1023,7 +993,12 @@ static int set_permissions(char *rundir)
 	int ret;
 	gid_t gid;
 
-	gid = utils_get_group_id(config.tracing_group_name.value);
+	ret = utils_get_group_id(
+			the_config.tracing_group_name.value, true, &gid);
+	if (ret) {
+		/* Default to root group. */
+		gid = 0;
+	}
 
 	/* Set lttng run dir */
 	ret = chown(rundir, 0, gid);
@@ -1044,30 +1019,34 @@ static int set_permissions(char *rundir)
 	}
 
 	/* lttng client socket path */
-	ret = chown(config.client_unix_sock_path.value, 0, gid);
+	ret = chown(the_config.client_unix_sock_path.value, 0, gid);
 	if (ret < 0) {
-		ERR("Unable to set group on %s", config.client_unix_sock_path.value);
+		ERR("Unable to set group on %s",
+				the_config.client_unix_sock_path.value);
 		PERROR("chown");
 	}
 
 	/* kconsumer error socket path */
-	ret = chown(kconsumer_data.err_unix_sock_path, 0, 0);
+	ret = chown(the_kconsumer_data.err_unix_sock_path, 0, 0);
 	if (ret < 0) {
-		ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
+		ERR("Unable to set group on %s",
+				the_kconsumer_data.err_unix_sock_path);
 		PERROR("chown");
 	}
 
 	/* 64-bit ustconsumer error socket path */
-	ret = chown(ustconsumer64_data.err_unix_sock_path, 0, 0);
+	ret = chown(the_ustconsumer64_data.err_unix_sock_path, 0, 0);
 	if (ret < 0) {
-		ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
+		ERR("Unable to set group on %s",
+				the_ustconsumer64_data.err_unix_sock_path);
 		PERROR("chown");
 	}
 
 	/* 32-bit ustconsumer compat32 error socket path */
-	ret = chown(ustconsumer32_data.err_unix_sock_path, 0, 0);
+	ret = chown(the_ustconsumer32_data.err_unix_sock_path, 0, 0);
 	if (ret < 0) {
-		ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
+		ERR("Unable to set group on %s",
+				the_ustconsumer32_data.err_unix_sock_path);
 		PERROR("chown");
 	}
 
@@ -1083,12 +1062,12 @@ static int create_lttng_rundir(void)
 {
 	int ret;
 
-	DBG3("Creating LTTng run directory: %s", config.rundir.value);
+	DBG3("Creating LTTng run directory: %s", the_config.rundir.value);
 
-	ret = mkdir(config.rundir.value, S_IRWXU);
+	ret = mkdir(the_config.rundir.value, S_IRWXU);
 	if (ret < 0) {
 		if (errno != EEXIST) {
-			ERR("Unable to create %s", config.rundir.value);
+			ERR("Unable to create %s", the_config.rundir.value);
 			goto error;
 		} else {
 			ret = 0;
@@ -1110,13 +1089,13 @@ static int set_consumer_sockets(struct consumer_data *consumer_data)
 
 	switch (consumer_data->type) {
 	case LTTNG_CONSUMER_KERNEL:
-		path = config.kconsumerd_path.value;
+		path = the_config.kconsumerd_path.value;
 		break;
 	case LTTNG_CONSUMER64_UST:
-		path = config.consumerd64_path.value;
+		path = the_config.consumerd64_path.value;
 		break;
 	case LTTNG_CONSUMER32_UST:
-		path = config.consumerd32_path.value;
+		path = the_config.consumerd32_path.value;
 		break;
 	default:
 		ERR("Consumer type unknown");
@@ -1134,7 +1113,16 @@ static int set_consumer_sockets(struct consumer_data *consumer_data)
 		goto error;
 	}
 	if (is_root) {
-		ret = chown(path, 0, utils_get_group_id(config.tracing_group_name.value));
+		gid_t gid;
+
+		ret = utils_get_group_id(the_config.tracing_group_name.value,
+				true, &gid);
+		if (ret) {
+			/* Default to root group. */
+			gid = 0;
+		}
+
+		ret = chown(path, 0, gid);
 		if (ret < 0) {
 			ERR("Unable to set group on %s", path);
 			PERROR("chown");
@@ -1265,7 +1253,7 @@ static void set_ulimit(void)
 
 static int write_pidfile(void)
 {
-        return utils_create_pid_file(getpid(), config.pid_file_path.value);
+	return utils_create_pid_file(getpid(), the_config.pid_file_path.value);
 }
 
 static int set_clock_plugin_env(void)
@@ -1273,12 +1261,12 @@ static int set_clock_plugin_env(void)
 	int ret = 0;
 	char *env_value = NULL;
 
-	if (!config.lttng_ust_clock_plugin.value) {
+	if (!the_config.lttng_ust_clock_plugin.value) {
 		goto end;
 	}
 
-        ret = asprintf(&env_value, "LTTNG_UST_CLOCK_PLUGIN=%s",
-			config.lttng_ust_clock_plugin.value);
+	ret = asprintf(&env_value, "LTTNG_UST_CLOCK_PLUGIN=%s",
+			the_config.lttng_ust_clock_plugin.value);
 	if (ret < 0) {
 		PERROR("asprintf");
 		goto end;
@@ -1292,7 +1280,7 @@ static int set_clock_plugin_env(void)
 	}
 
 	DBG("Updated LTTNG_UST_CLOCK_PLUGIN environment variable to \"%s\"",
-			config.lttng_ust_clock_plugin.value);
+			the_config.lttng_ust_clock_plugin.value);
 end:
 	return ret;
 }
@@ -1322,8 +1310,8 @@ static void destroy_all_sessions_and_wait(void)
 			goto unlock_session;
 		}
 		(void) cmd_stop_trace(session);
-		(void) cmd_destroy_session(session,
-				notification_thread_handle);
+		(void) cmd_destroy_session(
+				session, the_notification_thread_handle, NULL);
 	unlock_session:
 		session_unlock(session);
 		session_put(session);
@@ -1336,6 +1324,92 @@ static void destroy_all_sessions_and_wait(void)
 	DBG("Destruction of all sessions completed");
 }
 
+static void unregister_all_triggers(void)
+{
+	enum lttng_error_code ret_code;
+	enum lttng_trigger_status trigger_status;
+	struct lttng_triggers *triggers = NULL;
+	unsigned int trigger_count, i;
+	const struct lttng_credentials creds = {
+		.uid = LTTNG_OPTIONAL_INIT_VALUE(0),
+	};
+
+	DBG("Unregistering all triggers");
+
+	/*
+	 * List all triggers as "root" since we wish to unregister all triggers.
+	 */
+	ret_code = notification_thread_command_list_triggers(
+			the_notification_thread_handle, creds.uid.value,
+			&triggers);
+	if (ret_code != LTTNG_OK) {
+		ERR("Failed to list triggers while unregistering all triggers");
+		goto end;
+	}
+
+	trigger_status = lttng_triggers_get_count(triggers, &trigger_count);
+	assert(trigger_status == LTTNG_TRIGGER_STATUS_OK);
+
+	for (i = 0; i < trigger_count; i++) {
+		uid_t trigger_owner;
+		const char *trigger_name;
+		const struct lttng_trigger *trigger =
+				lttng_triggers_get_at_index(triggers, i);
+
+		assert(trigger);
+
+		trigger_status = lttng_trigger_get_owner_uid(
+				trigger, &trigger_owner);
+		assert(trigger_status == LTTNG_TRIGGER_STATUS_OK);
+
+		trigger_status = lttng_trigger_get_name(trigger, &trigger_name);
+		trigger_name = trigger_status == LTTNG_TRIGGER_STATUS_OK ?
+				trigger_name : "(anonymous)";
+
+		DBG("Unregistering trigger: trigger owner uid = %d, trigger name = '%s'",
+				(int) trigger_owner, trigger_name);
+
+		ret_code = cmd_unregister_trigger(&creds, trigger,
+				the_notification_thread_handle);
+		if (ret_code != LTTNG_OK) {
+			ERR("Failed to unregister trigger: trigger owner uid = %d, trigger name = '%s', error: '%s'",
+					(int) trigger_owner, trigger_name,
+					lttng_strerror(-ret_code));
+			/* Continue to unregister the remaining triggers. */
+		}
+	}
+end:
+	lttng_triggers_destroy(triggers);
+}
+
+static int run_as_worker_post_fork_cleanup(void *data)
+{
+	struct sessiond_config *sessiond_config = data;
+
+	sessiond_config_fini(sessiond_config);
+	return 0;
+}
+
+static int launch_run_as_worker(const char *procname)
+{
+	/*
+	 * Clean-up before forking the run-as worker. Any dynamically
+	 * allocated memory of which the worker is not aware will
+	 * be leaked as the process forks a run-as worker (and performs
+	 * no exec*()). The same would apply to any opened fd.
+	 */
+	return run_as_create_worker(
+			procname, run_as_worker_post_fork_cleanup, &the_config);
+}
+
+static void sessiond_uuid_log(void)
+{
+	char uuid_str[LTTNG_UUID_STR_LEN];
+
+	lttng_uuid_to_str(the_sessiond_uuid, uuid_str);
+	DBG("Starting lttng-sessiond {%s}", uuid_str);
+}
+
 /*
  * main
  */
@@ -1353,7 +1427,11 @@ int main(int argc, char **argv)
 	/* Queue of rotation jobs populated by the sessiond-timer. */
 	struct rotation_thread_timer_queue *rotation_timer_queue = NULL;
 	struct lttng_thread *client_thread = NULL;
+	struct lttng_thread *notification_thread = NULL;
+	struct lttng_thread *register_apps_thread = NULL;
+	enum event_notifier_error_accounting_status event_notifier_error_accounting_status;
 
+	logger_set_thread_name("Main", false);
 	init_kernel_workarounds();
 
 	rcu_register_thread();
@@ -1368,14 +1446,14 @@ int main(int argc, char **argv)
 		goto exit_set_signal_handler;
 	}
 
-	page_size = sysconf(_SC_PAGESIZE);
-	if (page_size < 0) {
+	the_page_size = sysconf(_SC_PAGESIZE);
+	if (the_page_size < 0) {
 		PERROR("sysconf _SC_PAGESIZE");
-		page_size = LONG_MAX;
-		WARN("Fallback page size to %ld", page_size);
+		the_page_size = LONG_MAX;
+		WARN("Fallback page size to %ld", the_page_size);
 	}
 
-	ret = sessiond_config_init(&config);
+	ret = sessiond_config_init(&the_config);
 	if (ret) {
 		retval = -1;
 		goto exit_set_signal_handler;
@@ -1385,7 +1463,7 @@ int main(int argc, char **argv)
 	 * Init config from environment variables.
 	 * Command line option override env configuration per-doc. Do env first.
 	 */
-	sessiond_config_apply_env_config(&config);
+	sessiond_config_apply_env_config(&the_config);
 
 	/*
 	 * Parse arguments and load the daemon configuration file.
@@ -1407,29 +1485,36 @@ int main(int argc, char **argv)
 	 * since daemonizing causes the sessiond's current working directory
 	 * to '/'.
 	 */
-	ret = sessiond_config_resolve_paths(&config);
+	ret = sessiond_config_resolve_paths(&the_config);
 	if (ret) {
 		goto exit_options;
 	}
 
 	/* Apply config. */
-	lttng_opt_verbose = config.verbose;
-	lttng_opt_quiet = config.quiet;
-	kconsumer_data.err_unix_sock_path =
-			config.kconsumerd_err_unix_sock_path.value;
-	kconsumer_data.cmd_unix_sock_path =
-			config.kconsumerd_cmd_unix_sock_path.value;
-	ustconsumer32_data.err_unix_sock_path =
-			config.consumerd32_err_unix_sock_path.value;
-	ustconsumer32_data.cmd_unix_sock_path =
-			config.consumerd32_cmd_unix_sock_path.value;
-	ustconsumer64_data.err_unix_sock_path =
-			config.consumerd64_err_unix_sock_path.value;
-	ustconsumer64_data.cmd_unix_sock_path =
-			config.consumerd64_cmd_unix_sock_path.value;
+	lttng_opt_verbose = the_config.verbose;
+	lttng_opt_quiet = the_config.quiet;
+	the_kconsumer_data.err_unix_sock_path =
+			the_config.kconsumerd_err_unix_sock_path.value;
+	the_kconsumer_data.cmd_unix_sock_path =
+			the_config.kconsumerd_cmd_unix_sock_path.value;
+	the_ustconsumer32_data.err_unix_sock_path =
+			the_config.consumerd32_err_unix_sock_path.value;
+	the_ustconsumer32_data.cmd_unix_sock_path =
+			the_config.consumerd32_cmd_unix_sock_path.value;
+	the_ustconsumer64_data.err_unix_sock_path =
+			the_config.consumerd64_err_unix_sock_path.value;
+	the_ustconsumer64_data.cmd_unix_sock_path =
+			the_config.consumerd64_cmd_unix_sock_path.value;
 	set_clock_plugin_env();
 
-	sessiond_config_log(&config);
+	sessiond_config_log(&the_config);
+	sessiond_uuid_log();
+
+	if (opt_print_version) {
+		print_version();
+		retval = 0;
+		goto exit_options;
+	}
 
 	if (create_lttng_rundir()) {
 		retval = -1;
@@ -1444,11 +1529,11 @@ int main(int argc, char **argv)
 	}
 
 	/* Daemonize */
-	if (config.daemonize || config.background) {
+	if (the_config.daemonize || the_config.background) {
 		int i;
 
-		ret = lttng_daemonize(&child_ppid, &recv_child_signal,
-			!config.background);
+		ret = lttng_daemonize(&the_child_ppid, &recv_child_signal,
+				!the_config.background);
 		if (ret < 0) {
 			retval = -1;
 			goto exit_options;
@@ -1467,7 +1552,7 @@ int main(int argc, char **argv)
 		}
 	}
 
-	if (run_as_create_worker(argv[0]) < 0) {
+	if (launch_run_as_worker(argv[0]) < 0) {
 		goto exit_create_run_as_worker_cleanup;
 	}
 
@@ -1480,24 +1565,24 @@ int main(int argc, char **argv)
 	 * Initialize the health check subsystem. This call should set the
 	 * appropriate time values.
 	 */
-	health_sessiond = health_app_create(NR_HEALTH_SESSIOND_TYPES);
-	if (!health_sessiond) {
+	the_health_sessiond = health_app_create(NR_HEALTH_SESSIOND_TYPES);
+	if (!the_health_sessiond) {
 		PERROR("health_app_create error");
 		retval = -1;
-		goto exit_health_sessiond_cleanup;
+		goto stop_threads;
 	}
 
 	/* Create thread to clean up RCU hash tables */
 	ht_cleanup_thread = launch_ht_cleanup_thread();
 	if (!ht_cleanup_thread) {
 		retval = -1;
-		goto exit_ht_cleanup;
+		goto stop_threads;
 	}
 
 	/* Create thread quit pipe */
 	if (sessiond_init_thread_quit_pipe()) {
 		retval = -1;
-		goto exit_init_data;
+		goto stop_threads;
 	}
 
 	/* Check if daemon is UID = 0 */
@@ -1509,32 +1594,32 @@ int main(int argc, char **argv)
 		if (!kernel_channel_monitor_pipe) {
 			ERR("Failed to create kernel consumer channel monitor pipe");
 			retval = -1;
-			goto exit_init_data;
+			goto stop_threads;
 		}
-		kconsumer_data.channel_monitor_pipe =
+		the_kconsumer_data.channel_monitor_pipe =
 				lttng_pipe_release_writefd(
-					kernel_channel_monitor_pipe);
-		if (kconsumer_data.channel_monitor_pipe < 0) {
+						kernel_channel_monitor_pipe);
+		if (the_kconsumer_data.channel_monitor_pipe < 0) {
 			retval = -1;
-			goto exit_init_data;
+			goto stop_threads;
 		}
 	}
 
 	/* Set consumer initial state */
-	kernel_consumerd_state = CONSUMER_STOPPED;
-	ust_consumerd_state = CONSUMER_STOPPED;
+	the_kernel_consumerd_state = CONSUMER_STOPPED;
+	the_ust_consumerd_state = CONSUMER_STOPPED;
 
 	ust32_channel_monitor_pipe = lttng_pipe_open(0);
 	if (!ust32_channel_monitor_pipe) {
 		ERR("Failed to create 32-bit user space consumer channel monitor pipe");
 		retval = -1;
-		goto exit_init_data;
+		goto stop_threads;
 	}
-	ustconsumer32_data.channel_monitor_pipe = lttng_pipe_release_writefd(
-			ust32_channel_monitor_pipe);
-	if (ustconsumer32_data.channel_monitor_pipe < 0) {
+	the_ustconsumer32_data.channel_monitor_pipe =
+			lttng_pipe_release_writefd(ust32_channel_monitor_pipe);
+	if (the_ustconsumer32_data.channel_monitor_pipe < 0) {
 		retval = -1;
-		goto exit_init_data;
+		goto stop_threads;
 	}
 
 	/*
@@ -1545,7 +1630,7 @@ int main(int argc, char **argv)
 	rotation_timer_queue = rotation_thread_timer_queue_create();
 	if (!rotation_timer_queue) {
 		retval = -1;
-		goto exit_init_data;
+		goto stop_threads;
 	}
 	timer_thread_parameters.rotation_thread_job_queue =
 			rotation_timer_queue;
@@ -1554,13 +1639,13 @@ int main(int argc, char **argv)
 	if (!ust64_channel_monitor_pipe) {
 		ERR("Failed to create 64-bit user space consumer channel monitor pipe");
 		retval = -1;
-		goto exit_init_data;
+		goto stop_threads;
 	}
-	ustconsumer64_data.channel_monitor_pipe = lttng_pipe_release_writefd(
-			ust64_channel_monitor_pipe);
-	if (ustconsumer64_data.channel_monitor_pipe < 0) {
+	the_ustconsumer64_data.channel_monitor_pipe =
+			lttng_pipe_release_writefd(ust64_channel_monitor_pipe);
+	if (the_ustconsumer64_data.channel_monitor_pipe < 0) {
 		retval = -1;
-		goto exit_init_data;
+		goto stop_threads;
 	}
 
 	/*
@@ -1570,7 +1655,16 @@ int main(int argc, char **argv)
 	if (ust_app_ht_alloc()) {
 		ERR("Failed to allocate UST app hash table");
 		retval = -1;
-		goto exit_init_data;
+		goto stop_threads;
+	}
+
+	event_notifier_error_accounting_status = event_notifier_error_accounting_init(
+			the_config.event_notifier_buffer_size_kernel,
+			the_config.event_notifier_buffer_size_userspace);
+	if (event_notifier_error_accounting_status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) {
+		ERR("Failed to initialize event notifier error accounting system");
+		retval = -1;
+		goto stop_threads;
 	}
 
 	/*
@@ -1580,9 +1674,14 @@ int main(int argc, char **argv)
 	if (agent_app_ht_alloc()) {
 		ERR("Failed to allocate Agent app hash table");
 		retval = -1;
-		goto exit_init_data;
+		goto stop_threads;
 	}
 
+	if (agent_by_event_notifier_domain_ht_create()) {
+		ERR("Failed to allocate per-event notifier domain agent hash table");
+		retval = -1;
+		goto stop_threads;
+	}
 	/*
 	 * These actions must be executed as root. We do that *after* setting up
 	 * the sockets path because we MUST make the check for another daemon using
@@ -1590,22 +1689,14 @@ int main(int argc, char **argv)
 	 * kernel tracer.
 	 */
 	if (is_root) {
-		if (set_consumer_sockets(&kconsumer_data)) {
+		if (set_consumer_sockets(&the_kconsumer_data)) {
 			retval = -1;
-			goto exit_init_data;
+			goto stop_threads;
 		}
 
 		/* Setup kernel tracer */
-		if (!config.no_kernel) {
+		if (!the_config.no_kernel) {
 			init_kernel_tracer();
-			if (kernel_tracer_fd >= 0) {
-				ret = syscall_init_table();
-				if (ret < 0) {
-					ERR("Unable to populate syscall table. "
-						"Syscall tracing won't work "
-						"for this session daemon.");
-				}
-			}
 		}
 
 		/* Set ulimit for open files */
@@ -1614,45 +1705,39 @@ int main(int argc, char **argv)
 	/* init lttng_fd tracking must be done after set_ulimit. */
 	lttng_fd_init();
 
-	if (set_consumer_sockets(&ustconsumer64_data)) {
-		retval = -1;
-		goto exit_init_data;
-	}
-
-	if (set_consumer_sockets(&ustconsumer32_data)) {
+	if (set_consumer_sockets(&the_ustconsumer64_data)) {
 		retval = -1;
-		goto exit_init_data;
+		goto stop_threads;
 	}
 
-	/* Set credentials to socket */
-	if (is_root && set_permissions(config.rundir.value)) {
+	if (set_consumer_sockets(&the_ustconsumer32_data)) {
 		retval = -1;
-		goto exit_init_data;
+		goto stop_threads;
 	}
 
 	/* Get parent pid if -S, --sig-parent is specified. */
-	if (config.sig_parent) {
-		ppid = getppid();
+	if (the_config.sig_parent) {
+		the_ppid = getppid();
 	}
 
 	/* Setup the kernel pipe for waking up the kernel thread */
-	if (is_root && !config.no_kernel) {
-		if (utils_create_pipe_cloexec(kernel_poll_pipe)) {
+	if (is_root && !the_config.no_kernel) {
+		if (utils_create_pipe_cloexec(the_kernel_poll_pipe)) {
 			retval = -1;
-			goto exit_init_data;
+			goto stop_threads;
 		}
 	}
 
 	/* Setup the thread apps communication pipe. */
 	if (utils_create_pipe_cloexec(apps_cmd_pipe)) {
 		retval = -1;
-		goto exit_init_data;
+		goto stop_threads;
 	}
 
 	/* Setup the thread apps notify communication pipe. */
 	if (utils_create_pipe_cloexec(apps_cmd_notify_pipe)) {
 		retval = -1;
-		goto exit_init_data;
+		goto stop_threads;
 	}
 
 	/* Initialize global buffer per UID and PID registry. */
@@ -1667,16 +1752,16 @@ int main(int argc, char **argv)
 	/* Check for the application socket timeout env variable. */
 	env_app_timeout = getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV);
 	if (env_app_timeout) {
-		config.app_socket_timeout = atoi(env_app_timeout);
+		the_config.app_socket_timeout = atoi(env_app_timeout);
 	} else {
-		config.app_socket_timeout = DEFAULT_APP_SOCKET_RW_TIMEOUT;
+		the_config.app_socket_timeout = DEFAULT_APP_SOCKET_RW_TIMEOUT;
 	}
 
 	ret = write_pidfile();
 	if (ret) {
 		ERR("Error in write_pidfile");
 		retval = -1;
-		goto exit_init_data;
+		goto stop_threads;
 	}
 
 	/* Initialize communication library */
@@ -1687,102 +1772,122 @@ int main(int argc, char **argv)
 	/* Create health-check thread. */
 	if (!launch_health_management_thread()) {
 		retval = -1;
-		goto exit_health;
+		goto stop_threads;
 	}
 
 	/* notification_thread_data acquires the pipes' read side. */
-	notification_thread_handle = notification_thread_handle_create(
-			ust32_channel_monitor_pipe,
-			ust64_channel_monitor_pipe,
+	the_notification_thread_handle = notification_thread_handle_create(
+			ust32_channel_monitor_pipe, ust64_channel_monitor_pipe,
 			kernel_channel_monitor_pipe);
-	if (!notification_thread_handle) {
+	if (!the_notification_thread_handle) {
 		retval = -1;
 		ERR("Failed to create notification thread shared data");
-		goto exit_notification;
+		goto stop_threads;
 	}
 
 	/* Create notification thread. */
-	if (!launch_notification_thread(notification_thread_handle)) {
+	notification_thread = launch_notification_thread(
+			the_notification_thread_handle);
+	if (!notification_thread) {
 		retval = -1;
-		goto exit_notification;
+		goto stop_threads;
 	}
 
 	/* Create timer thread. */
 	if (!launch_timer_thread(&timer_thread_parameters)) {
 		retval = -1;
-		goto exit_notification;
+		goto stop_threads;
 	}
 
 	/* rotation_thread_data acquires the pipes' read side. */
 	rotation_thread_handle = rotation_thread_handle_create(
-			rotation_timer_queue,
-			notification_thread_handle);
+			rotation_timer_queue, the_notification_thread_handle);
 	if (!rotation_thread_handle) {
 		retval = -1;
 		ERR("Failed to create rotation thread shared data");
 		stop_threads();
-		goto exit_rotation;
+		goto stop_threads;
 	}
 
 	/* Create rotation thread. */
 	if (!launch_rotation_thread(rotation_thread_handle)) {
 		retval = -1;
-		goto exit_rotation;
+		goto stop_threads;
 	}
 
 	/* Create thread to manage the client socket */
 	client_thread = launch_client_thread();
 	if (!client_thread) {
 		retval = -1;
-		goto exit_client;
+		goto stop_threads;
+	}
+
+	/* Set credentials of the client socket and rundir */
+	if (is_root && set_permissions(the_config.rundir.value)) {
+		retval = -1;
+		goto stop_threads;
 	}
 
 	if (!launch_ust_dispatch_thread(&ust_cmd_queue, apps_cmd_pipe[1],
 			apps_cmd_notify_pipe[1])) {
 		retval = -1;
-		goto exit_dispatch;
+		goto stop_threads;
 	}
 
 	/* Create thread to manage application registration. */
-	if (!launch_application_registration_thread(&ust_cmd_queue)) {
+	register_apps_thread = launch_application_registration_thread(
+			&ust_cmd_queue);
+	if (!register_apps_thread) {
 		retval = -1;
-		goto exit_reg_apps;
+		goto stop_threads;
 	}
 
 	/* Create thread to manage application socket */
 	if (!launch_application_management_thread(apps_cmd_pipe[0])) {
 		retval = -1;
-		goto exit_apps;
+		goto stop_threads;
 	}
 
 	/* Create thread to manage application notify socket */
 	if (!launch_application_notification_thread(apps_cmd_notify_pipe[0])) {
 		retval = -1;
-		goto exit_apps_notify;
+		goto stop_threads;
 	}
 
 	/* Create agent management thread. */
 	if (!launch_agent_management_thread()) {
 		retval = -1;
-		goto exit_agent_reg;
+		goto stop_threads;
 	}
 
 	/* Don't start this thread if kernel tracing is not requested nor root */
-	if (is_root && !config.no_kernel) {
+	if (is_root && !the_config.no_kernel) {
 		/* Create kernel thread to manage kernel event */
-		if (!launch_kernel_management_thread(kernel_poll_pipe[0])) {
+		if (!launch_kernel_management_thread(the_kernel_poll_pipe[0])) {
 			retval = -1;
-			goto exit_kernel;
+			goto stop_threads;
+		}
+
+		if (kernel_get_notification_fd() >= 0) {
+			ret = notification_thread_command_add_tracer_event_source(
+					the_notification_thread_handle,
+					kernel_get_notification_fd(),
+					LTTNG_DOMAIN_KERNEL);
+			if (ret != LTTNG_OK) {
+				ERR("Failed to add kernel trigger event source to notification thread");
+				retval = -1;
+				goto stop_threads;
+			}
 		}
 	}
 
 	/* Load sessions. */
-	ret = config_load_session(config.load_session_path.value,
-			NULL, 1, 1, NULL);
+	ret = config_load_session(
+			the_config.load_session_path.value, NULL, 1, 1, NULL);
 	if (ret) {
 		ERR("Session load failed: %s", error_get_str(ret));
 		retval = -1;
-		goto exit_load_session;
+		goto stop_threads;
 	}
 
 	/* Initialization completed. */
@@ -1794,35 +1899,33 @@ int main(int argc, char **argv)
 	 */
 
 	/* Initiate teardown once activity occurs on the quit pipe. */
-	sessiond_wait_for_quit_pipe(-1U);
+	sessiond_wait_for_quit_pipe(-1);
+
+stop_threads:
 
 	/*
 	 * Ensure that the client thread is no longer accepting new commands,
 	 * which could cause new sessions to be created.
 	 */
-	if (!lttng_thread_shutdown(client_thread)) {
-		ERR("Failed to shutdown the client thread, continuing teardown");
+	if (client_thread) {
+		lttng_thread_shutdown(client_thread);
 		lttng_thread_put(client_thread);
-		client_thread = NULL;
 	}
 
 	destroy_all_sessions_and_wait();
-exit_load_session:
-exit_kernel:
-exit_agent_reg:
-exit_apps_notify:
-exit_apps:
-exit_reg_apps:
-exit_dispatch:
-exit_client:
-exit_rotation:
-exit_notification:
-	lttng_thread_list_shutdown_orphans();
-exit_health:
-exit_init_data:
-	if (client_thread) {
-		lttng_thread_put(client_thread);
+
+	/*
+	 * At this point no new trigger can be registered (no sessions are
+	 * running/rotating) and clients can't connect to the session daemon
+	 * anymore. Unregister all triggers.
+	 */
+	unregister_all_triggers();
+
+	if (register_apps_thread) {
+		lttng_thread_shutdown(register_apps_thread);
+		lttng_thread_put(register_apps_thread);
 	}
+	lttng_thread_list_shutdown_orphans();
 
 	/*
 	 * Wait for all pending call_rcu work to complete before tearing
@@ -1837,6 +1940,39 @@ exit_init_data:
 	rcu_thread_online();
 	sessiond_cleanup();
 
+	/*
+	 * Wait for all pending call_rcu work to complete before shutting down
+	 * the notification thread. This call_rcu work includes shutting down
+	 * UST apps and event notifier pipes.
+	 */
+	rcu_barrier();
+
+	if (notification_thread) {
+		lttng_thread_shutdown(notification_thread);
+		lttng_thread_put(notification_thread);
+	}
+
+	/*
+	 * Error accounting teardown has to be done after the teardown of all
+	 * event notifier pipes to ensure that no tracer may try to use the
+	 * error accounting facilities.
+	 */
+	event_notifier_error_accounting_fini();
+
+	/*
+	 * Unloading the kernel modules needs to be done after all kernel
+	 * ressources have been released. In our case, this includes the
+	 * notification fd, the event notifier group fd, error accounting fd,
+	 * all event and event notifier fds, etc.
+	 *
+	 * In short, at this point, we need to have called close() on all fds
+	 * received from the kernel tracer.
+	 */
+	if (is_root && !the_config.no_kernel) {
+		DBG("Unloading kernel modules");
+     		modprobe_remove_lttng_all();
+	}
+
 	/*
 	 * Ensure all prior call_rcu are done. call_rcu callbacks may push
 	 * hash tables to the ht_cleanup thread. Therefore, we ensure that
@@ -1866,18 +2002,18 @@ exit_init_data:
 	 * session daemon's teardown in order to allow it to be notified
 	 * of the active session and channels at the moment of the teardown.
 	 */
-	if (notification_thread_handle) {
-		notification_thread_handle_destroy(notification_thread_handle);
+	if (the_notification_thread_handle) {
+		notification_thread_handle_destroy(
+				the_notification_thread_handle);
 	}
 	lttng_pipe_destroy(ust32_channel_monitor_pipe);
 	lttng_pipe_destroy(ust64_channel_monitor_pipe);
 	lttng_pipe_destroy(kernel_channel_monitor_pipe);
-exit_ht_cleanup:
 
-	health_app_destroy(health_sessiond);
-exit_health_sessiond_cleanup:
+	if (the_health_sessiond) {
+		health_app_destroy(the_health_sessiond);
+	}
 exit_create_run_as_worker_cleanup:
-
 exit_options:
 	sessiond_cleanup_lock_file();
 	sessiond_cleanup_options();