linux-kernel - Re: [patch 2/4] sched/mmcid: Protect transition on weakly ordered systems

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Message-ID: <b9522ab6-0171-41db-aa45-e9a883da5b0e@linux.ibm.com>
Date: Sat, 31 Jan 2026 11:40:30 +0530
From: Shrikanth Hegde <sshegde@...ux.ibm.com>
To: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc: Thomas Gleixner <tglx@...nel.org>,
        Ihor Solodrai
 <ihor.solodrai@...ux.dev>,
        Peter Zijlstra <peterz@...radead.org>,
        Michael Jeanson <mjeanson@...icios.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [patch 2/4] sched/mmcid: Protect transition on weakly ordered
 systems

Hi Mathieu.

On 1/31/26 12:28 AM, Mathieu Desnoyers wrote:
> On 2026-01-30 13:50, Shrikanth Hegde wrote:
>> Hi Thomas.
>>
>> On 1/30/26 2:50 AM, Thomas Gleixner wrote:
>>> Shrikanth reported a hard lockup which he observed once. The stack trace
>>> shows the following CID related participants:
>>>
>>
>> I lost the system where this was seen once.
>> But I gave the series a try on another power(NV) system.
>>
>> Ran schbench (which seems to execute some cid stuff) and hackbench
>> and didn't see any splat in limited testing.
> 
> Just out of curiosity, did you manage to reproduce the
> splat on the new system without the fixes applied ?
> 
> Thanks,
> 
> Mathieu
> 

No. I ran without the fixes. I didn't observe any splats either
on this system.