linux-kernel - Re: [syzbot] [bcachefs?] [rcu?] BUG: unable to handle kernel NULL pointer dereference in rcu

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Message-ID: <6845347b.050a0220.d8705.000c.GAE@google.com>
Date: Sat, 07 Jun 2025 23:58:03 -0700
From: syzbot <syzbot+80e5d6f453f14a53383a@...kaller.appspotmail.com>
To: akpm@...ux-foundation.org, ayaanmirza.788@...il.com, 
	ayaanmirzabaig85@...il.com, josh@...htriplett.org, kent.overstreet@...ux.dev, 
	linux-bcachefs@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-mm@...ck.org, luto@...nel.org, paulmck@...nel.org, peterz@...radead.org, 
	rcu@...r.kernel.org, syzkaller-bugs@...glegroups.com, tglx@...utronix.de
Subject: Re: [syzbot] [bcachefs?] [rcu?] BUG: unable to handle kernel NULL
 pointer dereference in rcu_core (3)

syzbot has bisected this issue to:

commit 14152654805256d760315ec24e414363bfa19a06
Author: Kent Overstreet <kent.overstreet@...ux.dev>
Date:   Mon Nov 25 05:21:27 2024 +0000

    bcachefs: Bad btree roots are now autofix

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=12fa0a82580000
start commit:   99fa936e8e4f Merge tag 'affs-6.14-rc5-tag' of git://git.ke..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=11fa0a82580000
console output: https://syzkaller.appspot.com/x/log.txt?x=16fa0a82580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=523d3ff8e053340a
dashboard link: https://syzkaller.appspot.com/bug?extid=80e5d6f453f14a53383a
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=119d35a8580000

Reported-by: syzbot+80e5d6f453f14a53383a@...kaller.appspotmail.com
Fixes: 141526548052 ("bcachefs: Bad btree roots are now autofix")

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