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

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Message-ID: <d9b315ef-ba3f-4415-a554-71b298574b41@efficios.com>
Date: Fri, 30 Jan 2026 13:58:22 -0500
From: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To: Shrikanth Hegde <sshegde@...ux.ibm.com>, Thomas Gleixner
 <tglx@...nel.org>, LKML <linux-kernel@...r.kernel.org>
Cc: Ihor Solodrai <ihor.solodrai@...ux.dev>,
 Peter Zijlstra <peterz@...radead.org>,
 Michael Jeanson <mjeanson@...icios.com>
Subject: Re: [patch 2/4] sched/mmcid: Protect transition on weakly ordered
 systems

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



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