Re: Apparent serious progressive ext4 data corruption bug in 3.6.3 (and other stable branches?)

[Nix]

On 24 Oct 2012, Theodore Ts'o stated:

>                         Journal flushes outside of an unmount does
> happen as part of online resizing, the FIBMAP ioctl, or when the file
> system is frozen.  But it didn't sound like Toralf or Nix was using
> any of those features.

Quite so -- the corrupted filesystems have space reserved for resizing,
and one of them has been resized, years ago, but I haven't resized
either of them with this kernel, or with any kernel numbered 3.x for
that matter.

> Toralf, Nix, if you could try applying this patch (at the end of this
> message), and let me know how and when the WARN_ON triggers, and if it
> does, please send the empty_bug_workaround plus the WARN_ON(1) report.
> I know about the case where a file system is mounted and then
> immediately unmounted, but we don't think that's the problematic case.
> If you see any other cases where WARN_ON is triggering, it would be
> really good to know....

I'll give it a test later today, after another backup has finished.
Daily backups are normally overkill, but I don't think they are right
now.

-- 
NULL && (void)
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