linux-kernel - Re: [syzbot] [mm?] WARNING: locking bug in __rmqueue

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Message-ID: <20241104114726.GD24862@noisy.programming.kicks-ass.net>
Date: Mon, 4 Nov 2024 12:47:26 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: Vlastimil Babka <vbabka@...e.cz>
Cc: syzbot <syzbot+39f85d612b7c20d8db48@...kaller.appspotmail.com>,
	Liam.Howlett@...cle.com, akpm@...ux-foundation.org,
	jannh@...gle.com, linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	lorenzo.stoakes@...cle.com, syzkaller-bugs@...glegroups.com,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Marco Elver <elver@...gle.com>,
	Andrey Konovalov <andreyknvl@...il.com>,
	kasan-dev <kasan-dev@...glegroups.com>,
	Andrey Ryabinin <ryabinin.a.a@...il.com>,
	Alexander Potapenko <glider@...gle.com>,
	Waiman Long <longman@...hat.com>, dvyukov@...gle.com,
	vincenzo.frascino@....com, paulmck@...nel.org, frederic@...nel.org,
	neeraj.upadhyay@...nel.org, joel@...lfernandes.org,
	josh@...htriplett.org, boqun.feng@...il.com, urezki@...il.com,
	rostedt@...dmis.org, mathieu.desnoyers@...icios.com,
	jiangshanlai@...il.com, qiang.zhang1211@...il.com, mingo@...hat.com,
	juri.lelli@...hat.com, vincent.guittot@...aro.org,
	dietmar.eggemann@....com, bsegall@...gle.com, mgorman@...e.de,
	vschneid@...hat.com, tj@...nel.org, cl@...ux.com,
	penberg@...nel.org, rientjes@...gle.com, iamjoonsoo.kim@....com,
	roman.gushchin@...ux.dev, 42.hyeyoo@...il.com, rcu@...r.kernel.org
Subject: Re: [syzbot] [mm?] WARNING: locking bug in __rmqueue_pcplist

On Mon, Nov 04, 2024 at 12:45:06PM +0100, Peter Zijlstra wrote:
> diff --git a/mm/kasan/generic.c b/mm/kasan/generic.c
> index 6310a180278b..ac9f6682bb2f 100644
> --- a/mm/kasan/generic.c
> +++ b/mm/kasan/generic.c
> @@ -521,12 +521,12 @@ size_t kasan_metadata_size(struct kmem_cache *cache, bool in_object)
>  			sizeof(struct kasan_free_meta) : 0);
>  }
>  
> -static void __kasan_record_aux_stack(void *addr, depot_flags_t depot_flags)
> +void kasan_record_aux_stack(void *addr)
>  {
>  	struct slab *slab = kasan_addr_to_slab(addr);
>  	struct kmem_cache *cache;
>  	struct kasan_alloc_meta *alloc_meta;
> -	void *object;
> +	void *object

Clearly I'm still struggling to type ... *sigh*