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

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Message-ID: <20251109-lesung-erkaufen-476f6fb00b1b@brauner>
Date: Sun, 9 Nov 2025 14:39:18 +0100
From: Christian Brauner <brauner@...nel.org>
To: syzbot <syzbot+1957b26299cf3ff7890c@...kaller.appspotmail.com>
Cc: Liam.Howlett@...cle.com, akpm@...ux-foundation.org, 
	anna-maria@...utronix.de, bpf@...r.kernel.org, bsegall@...gle.com, cgroups@...r.kernel.org, 
	david@...hat.com, dietmar.eggemann@....com, frederic@...nel.org, 
	hannes@...xchg.org, jack@...e.cz, jsavitz@...hat.com, juri.lelli@...hat.com, 
	kees@...nel.org, linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-mm@...ck.org, linux-security-module@...r.kernel.org, 
	lorenzo.stoakes@...cle.com, mgorman@...e.de, mhocko@...e.com, mingo@...hat.com, 
	mjguzik@...il.com, mkoutny@...e.com, oleg@...hat.com, paul@...l-moore.com, 
	peterz@...radead.org, rostedt@...dmis.org, rppt@...nel.org, sergeh@...nel.org, 
	surenb@...gle.com, syzkaller-bugs@...glegroups.com, tglx@...utronix.de, 
	tj@...nel.org, vbabka@...e.cz, vincent.guittot@...aro.org, 
	viro@...iv.linux.org.uk, vschneid@...hat.com
Subject: Re: [syzbot] [fs?] WARNING in destroy_super_work

On Thu, Nov 06, 2025 at 11:31:27PM -0800, syzbot wrote:
> 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
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/40058f8a830c/disk-98231209.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/1d7f42e8639f/vmlinux-98231209.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/d8bb0284f393/bzImage-98231209.xz
> 
> The issue was bisected to:
> 
> commit 3c9820d5c64aeaadea7ffe3a6bb99d019a5ff46a
> Author: Christian Brauner <brauner@...nel.org>
> Date:   Wed Oct 29 12:20:24 2025 +0000
> 
>     ns: add active reference count
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=101e9bcd980000
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=121e9bcd980000
> console output: https://syzkaller.appspot.com/x/log.txt?x=141e9bcd980000
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+1957b26299cf3ff7890c@...kaller.appspotmail.com
> Fixes: 3c9820d5c64a ("ns: add active reference count")

#syz test: https://github.com/brauner/linux.git namespace-6.19.fixes