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

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Message-ID: <69104fa2.a70a0220.22f260.00a5.GAE@google.com>
Date: Sun, 09 Nov 2025 00:24:02 -0800
From: syzbot <syzbot+0b2e79f91ff6579bfa5b@...kaller.appspotmail.com>
To: Liam.Howlett@...cle.com, Liam.Howlett@...cle.com, 
	akpm@...ux-foundation.org, bpf@...r.kernel.org, brauner@...nel.org, 
	bsegall@...gle.com, david@...hat.com, dietmar.eggemann@....com, jack@...e.cz, 
	jsavitz@...hat.com, juri.lelli@...hat.com, kartikey406@...il.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, 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, vbabka@...e.cz, 
	vincent.guittot@...aro.org, viro@...iv.linux.org.uk, vschneid@...hat.com
Subject: Re: [syzbot] [fs?] WARNING in nsproxy_ns_active_put

syzbot has bisected this issue to:

commit 3a18f809184bc5a1cfad7cde5b8b026e2ff61587
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=11a350b4580000
start commit:   9c0826a5d9aa Add linux-next specific files for 20251107
git tree:       linux-next
final oops:     https://syzkaller.appspot.com/x/report.txt?x=13a350b4580000
console output: https://syzkaller.appspot.com/x/log.txt?x=15a350b4580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=f2ebeee52bf052b8
dashboard link: https://syzkaller.appspot.com/bug?extid=0b2e79f91ff6579bfa5b
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1639d084580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1625aa92580000

Reported-by: syzbot+0b2e79f91ff6579bfa5b@...kaller.appspotmail.com
Fixes: 3a18f809184b ("ns: add active reference count")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection