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

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Message-ID: <CAKYAXd-A9D3EtU=0+Qt5ktQH_KVdrvLFiSWB73964fmhkjVrRg@mail.gmail.com>
Date:   Sat, 15 Jul 2023 08:29:47 +0900
From:   Namjae Jeon <linkinjeon@...nel.org>
To:     Aleksandr Nogikh <nogikh@...gle.com>
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)

2023-07-15 2:46 GMT+09:00, Aleksandr Nogikh <nogikh@...gle.com>:
> 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

I understood that the problem are fixed with this patch. We will apply
it with syzbot's tested-by tag.
Thanks for your help!
>
>>
>> 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.
>> >
>>
>> --
>