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

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On 24 Oct 2012, nix@xxxxxxxxxxxxx uttered the following:
> So, the net effect of this is that normally I get no journal recovery on
> anything at all -- but sometimes, if umounting takes longer than a few
> seconds, I reboot with not everything unmounted, and journal recovery
> kicks in on reboot. My post-test fscks this time suggest that only when
> journal recovery kicks in after rebooting out of 2.6.3 do I see
> corruption. So this is indeed an unclean shutdown journal-replay
> situation: it just happens that I routinely have one or two fses
> uncleanly unmounted when all the rest are cleanly unmounted. This
> perhaps explains the scattershot nature of the corruption I see, and why
> most of my ext4 filesystems get off scot-free.

Note that two umounts are not required: fsck found corruption on /var
after a single boot+shutdown round in 3.6.3+this patch. (It did do a
journal replay on /var first.)

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