[PATCH lttng-ust 1/2] Fix: reset cached vpid context on fork

[PATCH lttng-ust 1/2] Fix: reset cached vpid context on fork

[Michael Jeanson]

We currently reset the cached vtid on fork but not the vpid. This is not
a problem on Linux because we don't cache the vpid internally but call
getpid() directly and rely on the glibc pid cache.

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
---
 liblttng-ust/lttng-ust-comm.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/liblttng-ust/lttng-ust-comm.c b/liblttng-ust/lttng-ust-comm.c
index 4391446..d4add1c 100644
--- a/liblttng-ust/lttng-ust-comm.c
+++ b/liblttng-ust/lttng-ust-comm.c
@@ -2011,6 +2011,7 @@ void ust_after_fork_child(sigset_t *restore_sigset)
 {
 	if (URCU_TLS(lttng_ust_nest_count))
 		return;
+	lttng_context_vpid_reset();
 	lttng_context_vtid_reset();
 	DBG("process %d", getpid());
 	/* Release urcu mutexes */
-- 
2.7.4

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Re: [PATCH lttng-ust 1/2] Fix: reset cached vpid context on fork

[Mathieu Desnoyers]

Both patches merged into master, 2.10, 2.9, thanks!

Mathieu

----- On Mar 2, 2018, at 5:36 PM, Michael Jeanson mjeanson@efficios.com wrote:

> We currently reset the cached vtid on fork but not the vpid. This is not
> a problem on Linux because we don't cache the vpid internally but call
> getpid() directly and rely on the glibc pid cache.
> 
> Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
> ---
> liblttng-ust/lttng-ust-comm.c | 1 +
> 1 file changed, 1 insertion(+)
> 
> diff --git a/liblttng-ust/lttng-ust-comm.c b/liblttng-ust/lttng-ust-comm.c
> index 4391446..d4add1c 100644
> --- a/liblttng-ust/lttng-ust-comm.c
> +++ b/liblttng-ust/lttng-ust-comm.c
> @@ -2011,6 +2011,7 @@ void ust_after_fork_child(sigset_t *restore_sigset)
> {
> 	if (URCU_TLS(lttng_ust_nest_count))
> 		return;
> +	lttng_context_vpid_reset();
> 	lttng_context_vtid_reset();
> 	DBG("process %d", getpid());
> 	/* Release urcu mutexes */
> --
> 2.7.4

-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com
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