linux-kernel - Re: [syzbot] [btrfs?] general protection fault in __alloc

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Message-Id: <20240818221048.813-1-hdanton@sina.com>
Date: Mon, 19 Aug 2024 06:10:48 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+9fd43bb1ae7b5d9240c3@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [btrfs?] general protection fault in __alloc_workqueue

On Sat, 17 Aug 2024 23:06:23 -0700
> syzbot found the following issue on:
> 
> HEAD commit:    367b5c3d53e5 Add linux-next specific files for 20240816
> git tree:       linux-next
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15b868dd980000

#syz test linux-next  367b5c3d53e5

--- x/kernel/workqueue.c
+++ y/kernel/workqueue.c
@@ -5653,6 +5653,7 @@ static struct workqueue_struct *__alloc_
 	wq = kzalloc(wq_size, GFP_KERNEL);
 	if (!wq)
 		return NULL;
+	wq_init_lockdep(wq);
 
 	if (flags & WQ_UNBOUND) {
 		wq->unbound_attrs = alloc_workqueue_attrs();
@@ -5757,10 +5758,6 @@ struct workqueue_struct *alloc_workqueue
 	va_start(args, max_active);
 	wq = __alloc_workqueue(fmt, flags, max_active, args);
 	va_end(args);
-	if (!wq)
-		return NULL;
-
-	wq_init_lockdep(wq);
 
 	return wq;
 }
--