linux-kernel - Re: KCSAN: data-race in __fat_write_inode / fat12_ent

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Message-ID: <874ktva1nv.fsf@mail.parknet.co.jp>
Date:   Tue, 07 Apr 2020 22:03:16 +0900
From:   OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     syzbot <syzbot+6f1624f937d9d6911e2d@...kaller.appspotmail.com>,
        Marco Elver <elver@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: KCSAN: data-race in __fat_write_inode / fat12_ent_get

Dmitry Vyukov <dvyukov@...gle.com> writes:

>> You meant I can regenerate a disk image from that log (if so, how)?
>>
>> If not, for next time, it would be helpful if syzkaller provides the log
>> to regenerate the corrupted image (or saving a corrupted image) to
>> reproduce this, then I can try to detect the corruption pattern early.
>
>
> I've converted the program to C using syz-prog2c:
> https://github.com/google/syzkaller/blob/master/docs/syzbot.md#syzkaller-reproducers
> then slightly changed the generated program to dump the file to disk
> rather than mounting.
>
> The resulting image is attached (archived because it's mostly zeros).

Thank you! I think I can see now why the generated image became the
cause of this.
-- 
OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>