linux-kernel - Re: WARNING: filesystem loop5 was created with 512 inodes, the real maximum is 511, mounting anyway

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Message-ID: <8d5ec04c-4646-3b70-6f6c-ea989e6c2c59@infradead.org>
Date:   Mon, 30 Nov 2020 17:03:05 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     syzbot <syzbot+3fd34060f26e766536ff@...kaller.appspotmail.com>,
        LKML <linux-kernel@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: WARNING: filesystem loop5 was created with 512 inodes, the real
 maximum is 511, mounting anyway

On 11/30/20 12:43 AM, Dmitry Vyukov wrote:
> On Mon, Nov 30, 2020 at 5:29 AM Randy Dunlap <rdunlap@...radead.org> wrote:
>>
>> On 11/27/20 4:32 AM, syzbot wrote:
>>> Hello,
>>>
>>> syzbot found the following issue on:
>>>
>>> HEAD commit:    418baf2c Linux 5.10-rc5
>>> git tree:       upstream
>>> console output: https://syzkaller.appspot.com/x/log.txt?x=171555b9500000
>>> kernel config:  https://syzkaller.appspot.com/x/.config?x=b81aff78c272da44
>>> dashboard link: https://syzkaller.appspot.com/bug?extid=3fd34060f26e766536ff
>>> compiler:       gcc (GCC) 10.1.0-syz 20200507
>>>
>>> Unfortunately, I don't have any reproducer for this issue yet.
>>>
>>> IMPORTANT: if you fix the issue, please add the following tag to the commit:
>>> Reported-by: syzbot+3fd34060f26e766536ff@...kaller.appspotmail.com
>>>
>>> BFS-fs: bfs_fill_super(): loop5 is unclean, continuing
>>> BFS-fs: bfs_fill_super(): WARNING: filesystem loop5 was created with 512 inodes, the real maximum is 511, mounting anyway
>>> BFS-fs: bfs_fill_super(): Last block not available on loop5: 120
>>> BFS-fs: bfs_fill_super(): loop5 is unclean, continuing
>>> BFS-fs: bfs_fill_super(): WARNING: filesystem loop5 was created with 512 inodes, the real maximum is 511, mounting anyway
>>> BFS-fs: bfs_fill_super(): Last block not available on loop5: 120
>>>
>>>
>>> ---
>>> 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.
>>>
>>> syzbot will keep track of this issue. See:
>>> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
>>>
>>
>> Hi,
>> Can you provide the BFS image file that is being mounted?
>> (./file0 I think.)
>>
>> --
>> ~Randy
> 
> 
> Hi Randy,
> 
> I see this bug was reported with a reproducer:
> https://syzkaller.appspot.com/bug?id=a32ebd5db2f7c957b82cf54b97bdecf367bf0421
> I assume it's a dup of this one.

Sure, looks the same.

> If you need the image itself, you can dump it to a file in the C
> reproducer inside of syz_mount_image before mount call.

Yes, got that.

What outcome or result are you looking for here?
Or what do you see as the problem?


thanks.
-- 
~Randy