linux-ext4 - Re: BUG at fs/ext4/inode.c:1590!

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Message-ID: <5199D615.20106@gmx.de>
Date:	Mon, 20 May 2013 09:51:49 +0200
From:	Toralf Förster <toralf.foerster@....de>
To:	Eric Sandeen <sandeen@...hat.com>
CC:	Theodore Ts'o <tytso@....edu>, linux-ext4@...r.kernel.org
Subject: Re: BUG at fs/ext4/inode.c:1590!

On 05/20/2013 04:28 AM, Eric Sandeen wrote:
> It's probably possible that it's memory corruption too.
> 
>> > Can you replicate it?   Do you have the corrupted file system?
> Right, these bugs need to be narrowed down to be useful.
> 
When the bug occurred I was neither able to cd into the directory where
the log files resides nor I could do a sync. psgrep and friends hang too.
On the other hand I was able to write an email with thunderbird and send
it out before I had to power off the system - sysrq key alt+print+b
didn't worked too.

> Does trinity start w/ a random seed, so you can restart?  Or better
> yet, restart w/ that seed and show the last 20 syscalls before the
> bug, etc?
yes - trinity uses a randomly choosen seed. SO a replay is possible later.
But because the bug occurred after 3 hours /me thinks that a simple
replay with just few syscalls won't work.

> "I threw random garbage at the kernel and something fell off after a
> few hours" is a bit vague.  ;)

yes - I do know that the bug report lacks data to easy reproduce it -
OTOH I thought it is better to report that then to ignore.

To speed up things for fuzzy tests I do use file systems living in a
tempfs. I'll change my scripts to hold at least the main log file of
trinity on a hard disk and came back if I do have useful log data too.

-- 
MfG/Sincerely
Toralf Förster
pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3
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