[v2,16/23] trace2: destroy context stored in thread-local storage

Commit Message

Patrick Steinhardt Sept. 26, 2024, 11:46 a.m. UTC

Each thread may have a specific context in the trace2 subsystem that we
set up via thread-local storage. We do not set up a destructor for this
data though, which means that the context data will leak.

Plug this leak by installing a destructor. This leak is exposed by
t7814, but plugging it alone does not make the whole test suite pass.

Signed-off-by: Patrick Steinhardt <[e-mail]>
---
 trace2/tr2_tls.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

Patch

diff --git a/trace2/tr2_tls.c b/trace2/tr2_tls.c
index 4f75392952..7b023c1bfc 100644
--- a/trace2/tr2_tls.c
+++ b/trace2/tr2_tls.c
@@ -152,11 +152,19 @@  uint64_t tr2tls_absolute_elapsed(uint64_t us)
 	return us - tr2tls_us_start_process;
 }
 
+static void tr2tls_key_destructor(void *payload)
+{
+	struct tr2tls_thread_ctx *ctx = payload;
+	free((char *)ctx->thread_name);
+	free(ctx->array_us_start);
+	free(ctx);
+}
+
 void tr2tls_init(void)
 {
 	tr2tls_start_process_clock();
 
-	pthread_key_create(&tr2tls_key, NULL);
+	pthread_key_create(&tr2tls_key, tr2tls_key_destructor);
 	init_recursive_mutex(&tr2tls_mutex);
 
 	tr2tls_thread_main =