linux-kernel - Re: [syzbot] [sound?] possible deadlock in __snd_pcm_lib

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Message-ID: <20250903145905.r7Ak4Wya@linutronix.de>
Date: Wed, 3 Sep 2025 16:59:05 +0200
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: Hillf Danton <hdanton@...a.com>
Cc: syzbot <syzbot+10b4363fb0f46527f3f3@...kaller.appspotmail.com>,
	linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [sound?] possible deadlock in __snd_pcm_lib_xfer (2)

On 2025-08-30 14:56:37 [+0800], Hillf Danton wrote:
> > syz.0.46/6843 is trying to acquire lock:
> > ffff8880b8823d90 ((softirq_ctrl.lock)){+.+.}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:44 [inline]
> > ffff8880b8823d90 ((softirq_ctrl.lock)){+.+.}-{3:3}, at: __local_bh_disable_ip+0x264/0x400 kernel/softirq.c:168
> > 
> Given softirq_ctrl is percpu, this report is false positive.

No. This can happen on a single CPU.

Sebastian