Date:   Wed, 28 Nov 2018 10:56:50 +0100
From:   Rainer Fiebig <jrf@...lbox.org>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     linux-kernel@...r.kernel.org, grendel@...stedcode.net,
        Theodore Ts'o <tytso@....edu>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        linux-ext4@...r.kernel.org
Subject: Re: ext4 file system corruption with v4.19.3 / v4.19.4

Am 27.11.18 um 22:22 schrieb Guenter Roeck:
> On Tue, Nov 27, 2018 at 07:55:01PM +0100, Rainer Fiebig wrote:
>> Am Dienstag, 27. November 2018, 15:48:19 schrieb Marek Habersack:
>>> On 27/11/2018 15:32, Guenter Roeck wrote:
>>> Hi,
>>>
>>> You might try to see if you have CONFIG_SCSI_MQ_DEFAULT=yes in your kernel
>>> config. Starting with 4.19.1 it somehow interferes with ext4 and causes
>>> problems similar to the ones you list below. Ever since I disabled MQ
>>> (either recompile your kernel or add `scsi_mod.use_blk_mq=0` to the kernel
>>> command line) none of those errors came back.
>>>
>>> hope it helps,
>>>
>>> marek
>>
>> Unfortunately, this doesn't seem to work in every case: 
>> https://bugzilla.kernel.org/show_bug.cgi?id=201685#c54
>>
>> And I'm using a defconfig-4.19.3 (meaning: CONFIG_SCSI_MQ_DEFAULT=yes) in a VM 
>> and I'm not seeing those errors there. OK, it's a VM - but anyway.
>>
> 
> Agreed. I disabled CONFIG_SCSI_MQ_DEFAULT, but the problem is still seen
> at least on one of my servers, so disabling it does not help, at least not
> in my case.
> 
> If the problem is somehow related to CONFIG_SCSI_MQ_DEFAULT, you might
> have to explicitly use a scsi drive (virtio-scsi-pci or similar) to
> trigger its use in a VM.

It seems more likely to me now that it may have nothing to do with the
SCSI-settings. Perhaps with some other config-option that's not set in a
defconfig.

I had hoped the problem would show up in the VM, so I could have safely
bisected it there. But tough luck.

So long!

Rainer Fiebig


> 
> Guenter
> 
>> The definite cause of this can only be found by bisecting, IMO. And it needs 
>> to be pinned down because else some feeling of insecurity will remain.
>>
>> So long!
>>
>> Rainer Fiebig
>>
>>>
>>>> [trying again, this time with correct kernel.org address]
>>>>
>>>> Hi,
>>>>
>>>> I have seen the following and similar problems several times,
>>>> with both v4.19.3 and v4.19.4:
>>>>
>>>> Nov 23 04:32:25 mars kernel: [112668.673671] EXT4-fs error (device sdb1):
>>>> ext4_iget:4831: inode #12602889: comm git: bad extra_isize 33661 (inode
>>>> size 256)
>>>> Nov 23 04:32:25 mars kernel: [112668.675217] Aborting journal on device
>>>> sdb1-8. Nov 23 04:32:25 mars kernel: [112668.676681] EXT4-fs (sdb1):
>>>> Remounting filesystem read-only Nov 23 04:32:25 mars kernel:
>>>> [112668.808886] EXT4-fs error (device sdb1): ext4_iget:4831: inode
>>>> #12602881: comm rm: bad extra_isize 33685 (inode size 256)
>>>> ...
>>>>
>>>> Nov 25 00:12:43 saturn kernel: [59377.725984] EXT4-fs error (device sda1):
>>>> ext4_lookup:1578: inode #238034131: comm updatedb.mlocat: deleted inode
>>>> referenced: 238160407
>>>> Nov 25 00:12:43 saturn kernel: [59377.766638] Aborting journal on device
>>>> sda1-8. Nov 25 00:12:43 saturn kernel: [59377.779372] EXT4-fs (sda1):
>>>> Remounting filesystem read-only ...
>>>>
>>>> Nov 24 01:52:31 saturn kernel: [189085.240016] EXT4-fs error (device
>>>> sda1): ext4_lookup:1578: inode #52038457: comm nfsd: deleted inode
>>>> referenced: 52043796
>>>> Nov 24 01:52:31 saturn kernel: [189085.263427] Aborting journal on device
>>>> sda1-8. Nov 24 01:52:31 saturn kernel: [189085.275313] EXT4-fs (sda1):
>>>> Remounting filesystem read-only
>>>>
>>>>
>>>> The same systems running v4.18.6 never experienced a problem.
>>>>
>>>> Has anyone else seen similar problems ? Is there anything I can do
>>>> to help tracking down the problem ?
>>>>
>>>> Thanks,
>>>> Guenter
>>
>> -- 
>> The truth always turns out to be simpler than you thought.
>> Richard Feynman
> 
> 




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