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

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Message-Id: <20240316085211.1816-1-hdanton@sina.com>
Date: Sat, 16 Mar 2024 16:52:11 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+f3bc6f8108108010a03d@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [sound?] possible deadlock in snd_timer_close_locked

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git fe46a7dd189e

--- x/sound/core/timer.c
+++ y/sound/core/timer.c
@@ -409,8 +409,9 @@ static void snd_timer_close_locked(struc
 	struct snd_timer *timer = timeri->timer;
 
 	if (timer) {
-		guard(spinlock)(&timer->lock);
+		spin_lock_irq(&timer->lock);
 		timeri->flags |= SNDRV_TIMER_IFLG_DEAD;
+		spin_unlock_irq(&timer->lock);
 	}
 
 	if (!list_empty(&timeri->open_list)) {
--