linux-ext4 - ext4 metadata corruption bug bites again

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Date:	Fri, 21 Aug 2015 11:45:34 +0200
From:	Sander Smeenk <ssmeenk@...shdot.net>
To:	linux-ext4@...r.kernel.org
Subject: ext4 metadata corruption bug bites again

Hi list,

On April 20th, 2014 there was a thread on this list w. Nathanial W
Filardo, Theodore Tso and myself about ext4 metadata corruption on large
ext4 volumes. See http://marc.info/?l=linux-ext4&m=139878494527370&w=2
and further messages from the archives.

A bit of debugging was done, i fell out of that loop as my problems
seemed to have disappeared with further kernel updates from my distro,
but recently these issues seem to have re-appeared (or they never went
away and i just didn't hit this specific bug-trigger-situation?).

Again i'm getting sporadic fs errors like this most recent one:
(More of these i've pasted at https://8n1.org/10745/cc34)
| [000d00h01m43s] EXT4-fs error (device vdb): ext4_mb_generate_buddy:757:
|   group 79842, block bitmap and bg descriptor inconsistent: 10073 vs 10071
|   free clusters
| [000d00h01m43s] Aborting journal on device vdb-8.

An e2fsck run shows:
| Pass 5: Checking group summary information
| Block bitmap differences:  +(2616281446--2616281447)
| Fix? yes
| 
| Free blocks count wrong (170942497, counted=129906218).
| Fix? yes
| 
| Free inodes count wrong (670863012, counted=670860975).
| Fix? yes

My setup is largely the same, storage wise. Updated kernels here and
there, and the storage device /dev/vdb has grown to 10TiB which i
still use unpartitioned in this VM.

The VM is now running 3.19.0-25-generic #26-Ubuntu SMP Fri Jul 24
21:17:31 UTC 2015 x86_64

I'm able and willing to run patched kernels to trace this further.
Please advise.

With regards,
-Sander.
-- 
| > > Isn't this a stupid question?
| > Isn't this a stupid answer?
| No, it was another stupid question. This is the stupid answer. 
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