linux-kernel - Re: Re: EXT4 panic at jbd2_journal_put_journal

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Message-ID: <CA+8MBbKHJgnueAurRV1aeeV-NdzRTz_gVwYcJuyDrjJLErtcfg@mail.gmail.com>
Date:	Fri, 10 May 2013 10:27:58 -0700
From:	Tony Luck <tony.luck@...il.com>
To:	eunb.song@...sung.com
Cc:	"Theodore Ts'o" <tytso@....edu>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Re: EXT4 panic at jbd2_journal_put_journal_head() in 3.9+

I think I have the same (or highly similar) thing happening on ia64.

Similarities: seeing assertions fail for b_transaction
Differences: I only have ext3 filesystems mounted, no ext4

See attached trace.  I'm pretty certain that the highly unhelpful

    bugcheck! 0 [1]

comes from the

        J_ASSERT_JH(jh, jh->b_transaction == NULL);

from disassembling __journal_remove_journal_head(). The instruction
pointer <a0000001003d6690> points to the 2nd "break" instruction
in the function.

The problem shows up after 30 minutes to a couple of hours of stress (kernel
builds with "make -j32").

I'm pretty sure this problem didn't occur in plain v3.9 (it can run for
a full 24 hours).

Trying to bisect - but it takes a while to be convinced that a good kernel
is actually good (since I don't have a clear picture of how long to run
before deciding that the bug isn't going to show)

-Tony

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