linux-kernel - Re: [syzbot] [ext4?] kernel BUG in jbd2_journal_dirty

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Message-ID: <20240904111415.eo22zmhpggdavlzj@quack3>
Date: Wed, 4 Sep 2024 13:14:15 +0200
From: Jan Kara <jack@...e.cz>
To: syzbot <syzbot+c28d8da3e83b3cc68dc6@...kaller.appspotmail.com>
Cc: jack@...e.cz, jack@...e.com, linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com,
	tytso@....edu
Subject: Re: [syzbot] [ext4?] kernel BUG in jbd2_journal_dirty_metadata

On Wed 04-09-24 04:06:50, syzbot wrote:
> > On Tue 03-09-24 21:50:20, syzbot wrote:
> >> syzbot found the following issue on:
> >> 
> >> HEAD commit:    fb24560f31f9 Merge tag 'lsm-pr-20240830' of git://git.kern..
> >> git tree:       upstream
> >> console output: https://syzkaller.appspot.com/x/log.txt?x=1739530b980000
> >> kernel config:  https://syzkaller.appspot.com/x/.config?x=996585887acdadb3
> >> dashboard link: https://syzkaller.appspot.com/bug?extid=c28d8da3e83b3cc68dc6
> >> compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
> >> 
> >> Unfortunately, I don't have any reproducer for this issue yet.
> >> 
> >> Downloadable assets:
> >> disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-fb24560f.raw.xz
> >> vmlinux: https://storage.googleapis.com/syzbot-assets/2d39db26a2bc/vmlinux-fb24560f.xz
> >> kernel image: https://storage.googleapis.com/syzbot-assets/8910481ae16e/bzImage-fb24560f.xz
> >> 
> >> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> >> Reported-by: syzbot+c28d8da3e83b3cc68dc6@...kaller.appspotmail.com
> >> 
> >> loop0: detected capacity change from 0 to 32768
> >> =======================================================
> >> WARNING: The mand mount option has been deprecated and
> >>          and is ignored by this kernel. Remove the mand
> >>          option from the mount to silence this warning.
> >> =======================================================
> >> ocfs2: Mounting device (7,0) on (node local, slot 0) with ordered data mode.
> >> loop0: detected capacity change from 32768 to 0
> >> syz.0.0: attempt to access beyond end of device
> >> loop0: rw=0, sector=10576, nr_sectors = 1 limit=0
> >> (syz.0.0,5108,0):__ocfs2_xattr_set_value_outside:1385 ERROR: status = -5
> >
> > Looks like ocfs2 issue, not ext4.
> >
> > #syz set ocfs2

#syz set subsystems: ocfs2

								Honza
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR