Re: [syzbot] [kernfs?] possible deadlock in kernfs_link_sibling (2)

[Hillf Danton <hdanton@sina.com>]

> Date: Wed, 26 Aug 2026 12:33:31 -0700	[thread overview]
> syzbot has found a reproducer for the following issue on:
> 
> HEAD commit:    818bebeb63dd drm/xe: Don't hand out the flat CCS storage a..
> git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> console output: https://syzkaller.appspot.com/x/log.txt?x=10059625580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=ccca94d2c01b9e78
> dashboard link: https://syzkaller.appspot.com/bug?extid=dd764a450d93885d847f
> compiler:       gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13de8d49580000

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 818bebeb63dd

--- x/lib/once.c
+++ y/lib/once.c
@@ -93,6 +93,6 @@ void __do_once_sleepable_done(bool *done
 {
 	*done = true;
 	mutex_unlock(&once_mutex);
-	static_branch_disable(once_key);
+	once_disable_jump(once_key, mod);
 }
 EXPORT_SYMBOL(__do_once_sleepable_done);
--