linux-kernel - Re: [syzbot] [fs?] WARNING in destroy_super

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Message-ID: <20251107085422.8964-1-hdanton@sina.com>
Date: Fri,  7 Nov 2025 16:54:21 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+1957b26299cf3ff7890c@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [fs?] WARNING in destroy_super_work

> Date: Thu, 06 Nov 2025 23:31:27 -0800
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    982312090977 Add linux-next specific files for 20251103
> git tree:       linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=17b2932f980000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=43cc0e31558cb527
> dashboard link: https://syzkaller.appspot.com/bug?extid=1957b26299cf3ff7890c
> compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1347817c580000

#syz test

--- x/kernel/nscommon.c
+++ y/kernel/nscommon.c
@@ -117,9 +117,7 @@ struct ns_common *__must_check ns_owner(
 
 void __ns_ref_active_get_owner(struct ns_common *ns)
 {
-	ns = ns_owner(ns);
-	if (ns)
-		WARN_ON_ONCE(atomic_add_negative(1, &ns->__ns_ref_active));
+	__ns_ref_active_resurrect(ns);
 }
 
 /*
--