linux-ext4 - [Bug 14354] Bad corruption with 2.6.32-rc1 and upwards

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Message-Id: <200911032339.nA3NdjK5028991@demeter.kernel.org>
Date:	Tue, 3 Nov 2009 23:39:45 GMT
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 14354] Bad corruption with 2.6.32-rc1 and upwards

http://bugzilla.kernel.org/show_bug.cgi?id=14354





--- Comment #174 from Eric Sandeen <sandeen@...hat.com>  2009-11-03 23:39:40 ---
Tidbit; after turning on checksums but disabling any action on a mismatch, and
adding a little instrumentation, I got something like:

checksum error 1293235, (not) breaking
normal scan finish, setting end_transaction to 1293246
(fs/jbd2/recovery.c, 388): do_one_pass: Starting recovery pass 1
(fs/jbd2/recovery.c, 388): do_one_pass: Starting recovery pass 2
(fs/jbd2/recovery.c, 257): jbd2_journal_recover: JBD: recovery, exit status 0,
recovered transactions 1293215 to 1293246

IOW, the checksum error was far from the last transaction in the log; it was
somewhere in the middle-ish of what needed to be replayed.

So this more or less explains the corruption (many transactions were not
replayed because recovery was aborted when the bad checksum was found), and it
doesn't necessarily point to a problem with the transaction in flight when the
power-fail occurred... we had about 10 transactions after that.  Hrm.

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