linux-kernel - Re: [tip:perf/core] [perf] da916e96e2: BUG:KASAN:null-ptr-deref_in_put

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Message-ID: <72b016c4-3959-49d1-8964-0927eee101bf@linaro.org>
Date: Thu, 17 Apr 2025 09:58:36 +0100
From: James Clark <james.clark@...aro.org>
To: Peter Zijlstra <peterz@...radead.org>
Cc: Oliver Sang <oliver.sang@...el.com>, oe-lkp@...ts.linux.dev,
 lkp@...el.com, linux-kernel@...r.kernel.org, x86@...nel.org,
 Ravi Bangoria <ravi.bangoria@....com>, linux-perf-users@...r.kernel.org,
 Mark Rutland <mark.rutland@....com>, Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [tip:perf/core] [perf] da916e96e2:
 BUG:KASAN:null-ptr-deref_in_put_event



On 16/04/2025 8:08 pm, Peter Zijlstra wrote:
> On Wed, Apr 16, 2025 at 10:46:10AM +0200, Peter Zijlstra wrote:
>> On Tue, Apr 15, 2025 at 04:52:56PM +0100, James Clark wrote:
>>> Unrelated to the pointer deref issue, I'm also seeing perf stat not working
>>> due to this commit. And that's both with and without this fixup:
>>>
>>>   -> perf stat -- true
>>>
>>>   Performance counter stats for 'true':
>>>
>>>       <not counted> msec task-clock
>>>
>>>       <not counted>      context-switches
>>>
>>>       <not counted>      cpu-migrations
>>>
>>>       <not counted>      page-faults
>>>
>>>       <not counted>      armv8_cortex_a53/instructions/
>>>
>>>       <not counted>      armv8_cortex_a57/instructions/
>>>
>>>       <not counted>      armv8_cortex_a53/cycles/
>>>
>>>       <not counted>      armv8_cortex_a57/cycles/
>>>
>>>       <not counted>      armv8_cortex_a53/branches/
>>>
>>>       <not counted>      armv8_cortex_a53/branch-misses/
>>>
>>>       <not counted>      armv8_cortex_a57/branch-misses/
>>>
>>>
>>>         0.074139992 seconds time elapsed
>>>
>>>         0.000000000 seconds user
>>>         0.054797000 seconds sys
>>>
>>> Didn't look into it more other than bisecting it to this commit, but I can
>>> dig more unless the issue is obvious. This is on Arm big.LITTLE, although I
>>> didn't test it elsewhere so I'm not sure if that's relevant or not.
>>
>> I can reproduce on x86 alderlake (first machine I tried), so let me go
>> have a quick poke.
> 
> Could you please try queue.git/perf/core ? I've fixed this and found
> another problem.
> 
> I'll post the patches tomorrow, after the robot has had a go.

Yep that's all working now, thanks.