ACK/Cmnt: [PATCH 0/1][linux-5.15] trace events WARN

Tim Gardner tim.gardner at
Mon Aug 29 12:37:26 UTC 2022

On 8/27/22 20:02, Krister Johansen wrote:
> Dear Ubuntu Kernel Team:
> I'm requesting a cherry-pick of a patch that has been merged to both Linus's
> tree and the 5.15 stable branches.  It showed up for my team on
> linux-aws-5.15.0-1015, but I believe that it's common to all 5.15-based
> releases.
> This bug results in a WARN about an incorrect reference count if a program that
> is configuring uprobes receives a signal before it can complete the uprobe
> setup.  I believe that I have followed the KernelPatches procedure documented
> here (  I've tested this patch
> on an Ubuntu 5.15 branch as well as mainline.
> The issue is tracked in Launchpad as bug 1987232
> (
> The impact for my team is that we see this WARN many times a day and it does get
> picked up by our logging that tracks potential kernel problems.  If you'd be
> willing to target this at an upcoming 5.15 SRU release ahead of adopting the
> stable release that it's in right now, I'd be much obliged.
> Sincerely,
> -K
> Steven Rostedt (Google) (1):
>    tracing/perf: Fix double put of trace event when init fails
>   kernel/trace/trace_event_perf.c | 7 ++++---
>   1 file changed, 4 insertions(+), 3 deletions(-)
Acked-by: Tim Gardner <tim.gardner at>

Will also be included with v5.15.63 (whenever that gets applied)

Tim Gardner
Canonical, Inc

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