linux-kernel - Re: [BUG] sched/mm_cid: NULL pointer dereference in sched_mm_cid

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Message-ID: <20251226200310.91819-1-za4emsu@gmail.com>
Date: Fri, 26 Dec 2025 23:03:09 +0300
From: Artur Sultangirov <za4emsu@...il.com>
To: peterz@...radead.org,
	mingo@...hat.com
Cc: Artur Sultangirov <za4emsu@...il.com>,
	mathieu.desnoyers@...icios.com,
	juri.lelli@...hat.com,
	vincent.guittot@...aro.org,
	linux-kernel@...r.kernel.org
Subject: Re: [BUG] sched/mm_cid: NULL pointer dereference in sched_mm_cid_fork on ARM64

Hi,

I noticed that Mathieu Desnoyers already posted a fix for this issue here:
https://lore.kernel.org/all/d6ac8fe9-5fc0-4042-9592-cde3db82b65e@efficios.com/

I have applied this patch and verified that it fixes the panic on ARM64 (Apple M4 via QEMU in TCG mode).

Feel free to add:
Tested-by: Artur Sultangirov <za4emsu@...il.com>

Best regards,
Artur