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Fix: consumerd: unbalanced subbuffer 'get' when checking operation availability
[lttng-tools.git]
/
src
/
common
/
kernel-consumer
/
kernel-consumer.c
diff --git
a/src/common/kernel-consumer/kernel-consumer.c
b/src/common/kernel-consumer/kernel-consumer.c
index 083c8c0c7143b5c1048221f3868916885e3d90bf..4f734294caa553477f46eb0858edc45b3476b1e9 100644
(file)
--- a/
src/common/kernel-consumer/kernel-consumer.c
+++ b/
src/common/kernel-consumer/kernel-consumer.c
@@
-1699,8
+1699,15
@@
int put_next_subbuffer(struct lttng_consumer_stream *stream,
static
bool is_get_next_check_metadata_available(int tracer_fd)
{
static
bool is_get_next_check_metadata_available(int tracer_fd)
{
- return kernctl_get_next_subbuf_metadata_check(tracer_fd, NULL) !=
- -ENOTTY;
+ const int ret = kernctl_get_next_subbuf_metadata_check(tracer_fd, NULL);
+ const bool available = ret != -ENOTTY;
+
+ if (ret == 0) {
+ /* get succeeded, make sure to put the subbuffer. */
+ kernctl_put_subbuf(tracer_fd);
+ }
+
+ return available;
}
static
}
static
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