linux-kernel - Re: [syzbot] Monthly fat report (Jul 2023)

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Date:   Fri, 14 Jul 2023 19:46:42 +0200
From:   Aleksandr Nogikh <nogikh@...gle.com>
To:     Namjae Jeon <linkinjeon@...nel.org>
Cc:     syzbot <syzbot+list96b6ab127c02d379290b@...kaller.appspotmail.com>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        sj1557.seo@...sung.com, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] Monthly fat report (Jul 2023)

On Fri, Jul 14, 2023 at 3:45 PM Namjae Jeon <linkinjeon@...nel.org> wrote:
>
> 2023-07-03 18:04 GMT+09:00, syzbot
> <syzbot+list96b6ab127c02d379290b@...kaller.appspotmail.com>:
> > Hello fat maintainers/developers,
> Hi Syzbot,
>
> It's not fat, it's exfat :)

I'll look into renaming it on syzbot :)

> >
> > This is a 31-day syzbot report for the fat subsystem.
> > All related reports/information can be found at:
> > https://syzkaller.appspot.com/upstream/s/fat
> >
> > During the period, 3 new issues were detected and 0 were fixed.
> > In total, 11 issues are still open and 20 have been fixed so far.
> >
> > Some of the still happening issues:
> >
> > Ref Crashes Repro Title
> > <1> 347     Yes   possible deadlock in filemap_fault
> >
> > https://syzkaller.appspot.com/bug?extid=7736960b837908f3a81d
> > <2> 257     Yes   possible deadlock in exfat_get_block
> >
> > https://syzkaller.appspot.com/bug?extid=247e66a2c3ea756332c7
> > <3> 181     Yes   possible deadlock in exfat_iterate
> >
> > https://syzkaller.appspot.com/bug?extid=38655f1298fefc58a904
> > <4> 100     Yes   possible deadlock in exc_page_fault
> >
> > https://syzkaller.appspot.com/bug?extid=6d274a5dc4fa0974d4ad
> > <5> 39      Yes   possible deadlock in do_user_addr_fault
> >
> > https://syzkaller.appspot.com/bug?extid=278098b0faaf0595072b
> > <6> 2       Yes   KASAN: slab-use-after-free Write in
> > collect_expired_timers

#syz set <6> subsystems: reiserfs

> >
> > https://syzkaller.appspot.com/bug?extid=fb8d39ebb665f80c2ec1
> > <7> 1       Yes   BUG: corrupted list in __mark_inode_dirty

#syz set <7> subsystems: reiserfs

> >
> > https://syzkaller.appspot.com/bug?extid=4a16683f5520de8e47c4
> >
>
> Can you check if deadlock problem(<1>, <2>, <3>, <4>, <5>, <6>) are
> fixed with the following patch ?
> https://lore.kernel.org/lkml/20230714084354.1959951-1-sj1557.seo@samsung.com/T/#u

We currently unfortunately don't support bulk testing, I've sent a few
requests manually (<1>, <3>, <4>):
https://groups.google.com/g/syzkaller-bugs/c/ynCUkcnqEiQ/m/qsVWSdWOBAAJ
https://groups.google.com/g/syzkaller-bugs/c/jKpqY82OuZk
https://groups.google.com/g/syzkaller-bugs/c/7CO-77jYTAQ/m/lBmXby-OBAAJ

>
> Numbers <6>, <7> are not exfat issues. Can you remove them in your list?

Thanks for triaging! I've updated their subsystems to reiserfs (see
commands above).

>
> Thanks.
> > ---
> > This report is generated by a bot. It may contain errors.
> > See https://goo.gl/tpsmEJ for more information about syzbot.
> > syzbot engineers can be reached at syzkaller@...glegroups.com.
> >
> > To disable reminders for individual bugs, reply with the following command:
> > #syz set <Ref> no-reminders
> >
> > To change bug's subsystems, reply with:
> > #syz set <Ref> subsystems: new-subsystem
> >
> > You may send multiple commands in a single email message.
> >
>
> --