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Message-ID: <68e07283.a00a0220.102ee.0118.GAE@google.com>
Date: Fri, 03 Oct 2025 18:04:03 -0700
From: syzbot <syzbot+8715dd783e9b0bef43b1@...kaller.appspotmail.com>
To: bigeasy@...utronix.de, boqun.feng@...il.com, bp@...en8.de, 
	brauner@...nel.org, clrkwllms@...nel.org, dave.hansen@...ux.intel.com, 
	davem@...emloft.net, dsahern@...nel.org, edumazet@...gle.com, 
	horms@...nel.org, hpa@...or.com, jack@...e.cz, kprateek.nayak@....com, 
	kuba@...nel.org, kuniyu@...gle.com, linux-fsdevel@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-rt-devel@...ts.linux.dev, luto@...nel.org, 
	mingo@...hat.com, ncardwell@...gle.com, neil@...wn.name, 
	netdev@...r.kernel.org, pabeni@...hat.com, peterz@...radead.org, 
	rostedt@...dmis.org, ryotkkr98@...il.com, syzkaller-bugs@...glegroups.com, 
	tglx@...utronix.de, viro@...iv.linux.org.uk, x86@...nel.org
Subject: Re: [syzbot] [fs?] kernel BUG in qlist_free_all (2)

syzbot has bisected this issue to:

commit 3253cb49cbad4772389d6ef55be75db1f97da910
Author: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Date:   Thu Sep 4 14:25:25 2025 +0000

    softirq: Allow to drop the softirq-BKL lock on PREEMPT_RT

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=17566a7c580000
start commit:   7f7072574127 Merge tag 'kbuild-6.18-1' of git://git.kernel..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=14d66a7c580000
console output: https://syzkaller.appspot.com/x/log.txt?x=10d66a7c580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=b78ebc06b51acd7e
dashboard link: https://syzkaller.appspot.com/bug?extid=8715dd783e9b0bef43b1
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16ba76e2580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17741ee2580000

Reported-by: syzbot+8715dd783e9b0bef43b1@...kaller.appspotmail.com
Fixes: 3253cb49cbad ("softirq: Allow to drop the softirq-BKL lock on PREEMPT_RT")

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

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