linux-kernel - Re: [syzbot] [wireguard?] WARNING in kthread

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20240730102200.2312-1-hdanton@sina.com>
Date: Tue, 30 Jul 2024 18:22:00 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+943d34fa3cf2191e3068@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [wireguard?] WARNING in kthread_unpark (2)

On Mon, 29 Jul 2024 08:48:30 -0700
> syzbot has found a reproducer for the following issue on:
> 
> HEAD commit:    dc1c8034e31b minmax: simplify min()/max()/clamp() implemen..
> git tree:       upstream
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1022b573980000

#syz test upstream  dc1c8034e31b

--- x/kernel/workqueue.c
+++ y/kernel/workqueue.c
@@ -2679,7 +2679,8 @@ static void worker_attach_to_pool(struct
 		worker->flags |= WORKER_UNBOUND;
 	} else {
 		WARN_ON_ONCE(pool->flags & POOL_BH);
-		kthread_set_per_cpu(worker->task, pool->cpu);
+		if (!worker->rescue_wq)
+			kthread_set_per_cpu(worker->task, pool->cpu);
 	}
 
 	if (worker->rescue_wq)
--