linux-kernel - Re: [syzbot] [bcachefs?] WARNING in bch2_fs

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Date: Wed, 12 Jun 2024 19:23:23 -0400
From: Kent Overstreet <kent.overstreet@...ux.dev>
To: syzbot <syzbot+9757fdbdabd69eae08ad@...kaller.appspotmail.com>
Cc: akpm@...ux-foundation.org, bfoster@...hat.com, 
	linux-bcachefs@...r.kernel.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [bcachefs?] WARNING in bch2_fs_ioctl

On Tue, Jun 11, 2024 at 11:15:29AM -0700, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    83a7eefedc9b Linux 6.10-rc3
> git tree:       upstream
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=116b64de980000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=c79815c08cc14227
> dashboard link: https://syzkaller.appspot.com/bug?extid=9757fdbdabd69eae08ad
> compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=109726ee980000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13f2c4fe980000
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/b45273014a8f/disk-83a7eefe.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/94cd5708292e/vmlinux-83a7eefe.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/a89698812e8b/bzImage-83a7eefe.xz
> mounted in repro: https://storage.googleapis.com/syzbot-assets/2b8f6b18fd8a/mount_0.gz
> 
> The issue was bisected to:
> 
> commit 03ef80b469d5d83530ce1ce15be78a40e5300f9b
> Author: Kent Overstreet <kent.overstreet@...ux.dev>
> Date:   Sat Sep 23 22:41:51 2023 +0000
> 
>     bcachefs: Ignore unknown mount options

these bisects are all wrong...

> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1538cd96980000
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=1738cd96980000
> console output: https://syzkaller.appspot.com/x/log.txt?x=1338cd96980000
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+9757fdbdabd69eae08ad@...kaller.appspotmail.com
> Fixes: 03ef80b469d5 ("bcachefs: Ignore unknown mount options")
> 
> ------------[ cut here ]------------
> WARNING: CPU: 0 PID: 5079 at mm/page_alloc.c:4654 __alloc_pages_noprof+0x36a/0x6c0 mm/page_alloc.c:4654

this is already fixed in the disk accounting rewrite, queued up for 6.11