linux-kernel - Re: [syzbot] [sound?] INFO: rcu detected stall in snd_timer_user

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Date: Tue, 30 Apr 2024 07:35:40 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+43120c2af6ca2938cc38@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com,
	tiwai@...e.com
Subject: Re: [syzbot] [sound?] INFO: rcu detected stall in snd_timer_user_release (3)

On Mon, 29 Apr 2024 11:46:30 -0700
> syzbot found the following issue on:
> 
> HEAD commit:    e88c4cfcb7b8 Merge tag 'for-6.9-rc5-tag' of git://git.kern..
> git tree:       upstream
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1039c208980000

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git  e88c4cfcb7b8

--- x/sound/core/hrtimer.c
+++ y/sound/core/hrtimer.c
@@ -51,7 +51,8 @@ static enum hrtimer_restart snd_hrtimer_
 
 	guard(spinlock)(&t->lock);
 	if (t->running) {
-		hrtimer_add_expires_ns(hrt, t->sticks * resolution);
+		hrtimer_set_expires(hrt, ktime_add(hrt->base->get_time(),
+						   ns_to_ktime(NSEC_PER_USEC *200)));
 		ret = HRTIMER_RESTART;
 	}
 
--