linux-ext4 - Re: latest -git: A peculiar case of a stuck process (ext3/sched-related?)

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Message-ID: <e9e943910807180600t1e65a9b8o7f85e2751368275d@mail.gmail.com>
Date:	Fri, 18 Jul 2008 14:00:13 +0100
From:	"Duane Griffin" <duaneg@...da.com>
To:	"Vegard Nossum" <vegard.nossum@...il.com>
Cc:	linux-ext4@...r.kernel.org, sct@...hat.com,
	akpm@...ux-foundation.org, adilger@....com,
	"Ingo Molnar" <mingo@...e.hu>,
	"Peter Zijlstra" <a.p.zijlstra@...llo.nl>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: latest -git: A peculiar case of a stuck process (ext3/sched-related?)

2008/7/18 Vegard Nossum <vegard.nossum@...il.com>:
> And the ext3_find_entry() corresponds to this line:
>
>        for (; de < top; de = ext3_next_entry(de)) /* <--- HERE! */
>        if (ext3_match (namelen, name, de)) {
>                if (!ext3_check_dir_entry("ext3_find_entry",
>                                          dir, de, bh,
>                          (block<<EXT3_BLOCK_SIZE_BITS(sb))
>                                  +((char *)de - bh->b_data))) {
>                        brelse (bh);
>                        *err = ERR_BAD_DX_DIR;
>                        goto errout;
>                }
>                *res_dir = de;
>                dx_release (frames);
>                return bh;
>        }
>
> Is it possible that this loop can get stuck with a corrupt filesystem image?

It certainly is. This is the same problem as the first case reported
at http://bugzilla.kernel.org/show_bug.cgi?id=10882. There is a patch
in -mm for it already (2fde9f7a0faabe821b31ccd982d482c21f7c503f),
posted here: http://marc.info/?l=linux-kernel&m=121486328013470.

Hopefully that should fix the problem for you.

Cheers,
Duane.

-- 
"I never could learn to drink that blood and call it wine" - Bob Dylan
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