linux-ext4 - Re: [syzbot] [ext4?] WARNING in ext4_iomap

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Date:   Fri, 29 Sep 2023 07:29:18 -0700
From:   syzbot <syzbot+307da6ca5cb0d01d581a@...kaller.appspotmail.com>
To:     adilger.kernel@...ger.ca, bfoster@...hat.com, jack@...e.cz,
        linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, ritesh.list@...il.com,
        syzkaller-bugs@...glegroups.com, tytso@....edu
Subject: Re: [syzbot] [ext4?] WARNING in ext4_iomap_begin (2)

syzbot has bisected this issue to:

commit 310ee0902b8d9d0a13a5a13e94688a5863fa29c2
Author: Brian Foster <bfoster@...hat.com>
Date:   Tue Mar 14 13:07:59 2023 +0000

    ext4: allow concurrent unaligned dio overwrites

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=10a8442a680000
start commit:   9ed22ae6be81 Merge tag 'spi-fix-v6.6-rc3' of git://git.ker..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=12a8442a680000
console output: https://syzkaller.appspot.com/x/log.txt?x=14a8442a680000
kernel config:  https://syzkaller.appspot.com/x/.config?x=12da82ece7bf46f9
dashboard link: https://syzkaller.appspot.com/bug?extid=307da6ca5cb0d01d581a
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15eb672e680000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16219bc6680000

Reported-by: syzbot+307da6ca5cb0d01d581a@...kaller.appspotmail.com
Fixes: 310ee0902b8d ("ext4: allow concurrent unaligned dio overwrites")

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