linux-kernel - Re: [syzbot] [net] [virt] INFO: task hung in __vhost_worker

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Message-ID: <20250831084130.6242-1-hdanton@sina.com>
Date: Sun, 31 Aug 2025 16:41:29 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+7f3bbe59e8dd2328a990@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [net] [virt] INFO: task hung in __vhost_worker_flush

> Date: Sat, 30 Aug 2025 19:21:32 -0700	[thread overview]
> syzbot has found a reproducer for the following issue on:
> 
> HEAD commit:    11e7861d680c Merge tag 'for-linus' of git://git.kernel.org..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=17c5c242580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=d4703ac89d9e185a
> dashboard link: https://syzkaller.appspot.com/bug?extid=7f3bbe59e8dd2328a990
> compiler:       gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1671ba62580000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1685aa62580000

#syz test

--- a/kernel/vhost_task.c
+++ b/kernel/vhost_task.c
@@ -59,9 +59,9 @@ static int vhost_task_fn(void *data)
 	 */
 	if (!test_bit(VHOST_TASK_FLAGS_STOP, &vtsk->flags)) {
 		set_bit(VHOST_TASK_FLAGS_KILLED, &vtsk->flags);
-		vtsk->handle_sigkill(vtsk->data);
 	}
 	mutex_unlock(&vtsk->exit_mutex);
+	vtsk->handle_sigkill(vtsk->data);
 	complete(&vtsk->exited);
 
 	do_exit(0);
--