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

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Message-ID: <683c96c7.a00a0220.d8eae.0033.GAE@google.com>
Date: Sun, 01 Jun 2025 11:07:03 -0700
From: syzbot <syzbot+56edda805363e0a093b8@...kaller.appspotmail.com>
To: kent.overstreet@...ux.dev, linux-bcachefs@...r.kernel.org, 
	linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [bcachefs?] BUG: unable to handle kernel NULL pointer
 dereference in mempool_alloc_noprof (2)

syzbot has bisected this issue to:

commit d4d71b58e5139afc5f9bda0139b99404eb216d8a
Author: Kent Overstreet <kent.overstreet@...ux.dev>
Date:   Sat Apr 5 21:36:04 2025 +0000

    bcachefs: RO mounts now use less memory

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=10914c82580000
start commit:   4cb6c8af8591 selftests/filesystems: Fix build of anon_inod..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=12914c82580000
console output: https://syzkaller.appspot.com/x/log.txt?x=14914c82580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=e413b6de2bc0230
dashboard link: https://syzkaller.appspot.com/bug?extid=56edda805363e0a093b8
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11dd7ed4580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=113f9970580000

Reported-by: syzbot+56edda805363e0a093b8@...kaller.appspotmail.com
Fixes: d4d71b58e513 ("bcachefs: RO mounts now use less memory")

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