linux-kernel - Re: "[PATCH] selftests/ftrace: Correctly enable event in instance-event.tc"

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Date:   Wed, 6 Sep 2023 10:37:18 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Naresh Kamboju <naresh.kamboju@...aro.org>
Cc:     zhengyejian1@...wei.com, akaher@...are.com,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-trace-kernel@...r.kernel.org, mhiramat@...nel.org,
        shuah@...nel.org, skhan@...uxfoundation.org, yeweihua4@...wei.com
Subject: Re: "[PATCH] selftests/ftrace: Correctly enable event in
 instance-event.tc"

On Wed,  6 Sep 2023 19:56:52 +0530
Naresh Kamboju <naresh.kamboju@...aro.org> wrote:

> [my two cents]
> 
> I do see similar kernel panic while running ftrace testing on today's
> Linux next-20230906 tag. This crash is from qemu-arm64.
> 
> Here I am providing steps to reproduced link and scripts by using tuxrun tool.
>   - https://tuxapi.tuxsuite.com/v1/groups/linaro/projects/lkft/tests/2V0OqxEZUXIPNqWhQnnsuFOGYxR/reproducer
>   

[..]

> Log details,
> -------------
> # ok 45 ftrace - test tracing error log support
> <47>[ 1373.662292] systemd-journald[90]: Sent WATCHDOG=1 notification.
> # ok 46 Test creation and deletion of trace instances while setting an event

It's definitely a race with the creation and deletion of instances.

I'm going to run it on my laptop VM and see if that reproduces it. My other
VM is on a pretty powerful machine, and perhaps that's keeping it from
hitting the race.

-- Steve


> <1>[ 1382.873224] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000030
> <1>[ 1382.873223] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000030
> <1>[ 1382.873426] Mem abort info: