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From:   Rainer Fiebig <jrf@mailbox.org>
To:     linux-kernel@vger.kernel.org, grendel@twistedcode.net
Cc:     Guenter Roeck <linux@roeck-us.net>, Theodore Ts'o <tytso@mit.edu>,
        Andreas Dilger <adilger.kernel@dilger.ca>,
        linux-ext4@vger.kernel.org
Subject: Re: ext4 file system corruption with v4.19.3 / v4.19.4
Date:   Tue, 27 Nov 2018 19:55:01 +0100
Message-ID: <2157925.3ZPi3Rj3bs@siriux>
In-Reply-To: <5d94f857-b31d-a02c-5a20-2796076f447e@twistedcode.net>
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Am Dienstag, 27. November 2018, 15:48:19 schrieb Marek Habersack:
> On 27/11/2018 15:32, Guenter Roeck wrote:
> Hi,
>=20
> You might try to see if you have CONFIG_SCSI_MQ_DEFAULT=3Dyes in your=
 kernel
> config. Starting with 4.19.1 it somehow interferes with ext4 and caus=
es
> problems similar to the ones you list below. Ever since I disabled MQ=

> (either recompile your kernel or add `scsi_mod.use_blk_mq=3D0` to the=
 kernel
> command line) none of those errors came back.
>=20
> hope it helps,
>=20
> marek

Unfortunately, this doesn't seem to work in every case:=20
https://bugzilla.kernel.org/show_bug.cgi?id=3D201685#c54

And I'm using a defconfig-4.19.3 (meaning: CONFIG_SCSI_MQ_DEFAULT=3Dyes=
) in a VM=20
and I'm not seeing those errors there. OK, it's a VM - but anyway.

The definite cause of this can only be found by bisecting, IMO. And it =
needs=20
to be pinned down because else some feeling of insecurity will remain.

So long!

Rainer Fiebig

>=20
> > [trying again, this time with correct kernel.org address]
> >=20
> > Hi,
> >=20
> > I have seen the following and similar problems several times,
> > with both v4.19.3 and v4.19.4:
> >=20
> > 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 (i=
node
> > size 256)
> > Nov 23 04:32:25 mars kernel: [112668.675217] Aborting journal on de=
vice
> > 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)
> > ...
> >=20
> > Nov 25 00:12:43 saturn kernel: [59377.725984] EXT4-fs error (device=
 sda1):
> > ext4_lookup:1578: inode #238034131: comm updatedb.mlocat: deleted i=
node
> > referenced: 238160407
> > Nov 25 00:12:43 saturn kernel: [59377.766638] Aborting journal on d=
evice
> > sda1-8. Nov 25 00:12:43 saturn kernel: [59377.779372] EXT4-fs (sda1=
):
> > Remounting filesystem read-only ...
> >=20
> > Nov 24 01:52:31 saturn kernel: [189085.240016] EXT4-fs error (devic=
e
> > 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 (sda=
1):
> > Remounting filesystem read-only
> >=20
> >=20
> > The same systems running v4.18.6 never experienced a problem.
> >=20
> > Has anyone else seen similar problems ? Is there anything I can do
> > to help tracking down the problem ?
> >=20
> > Thanks,
> > Guenter

=2D-=20
The truth always turns out to be simpler than you thought.
Richard Feynman
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