linux-ext4 - 3.16-rc, ext4: oopses, OOMs after hard powerdown

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Date:	Tue, 8 Jul 2014 01:18:33 +0200
From:	Pavel Machek <pavel@....cz>
To:	Theodore Ts'o <tytso@....edu>,
	kernel list <linux-kernel@...r.kernel.org>,
	adilger.kernel@...ger.ca, linux-ext4@...r.kernel.org
Subject: 3.16-rc, ext4: oopses, OOMs after hard powerdown

Hi!

With 3.16-rc3, I did deliberate powerdown by holding down power key
(not a clean shutdown). On the next boot, I got some scary messages
about data corruption, "filesystem has errors, check forced", "reboot
linux". Unfortunately, that made the scary messages gone forever (I
tried ^S, was not fast enough), as system rebooted.

But it seems I have more of the bad stuff coming:

Mounting local filesystems threw an oops and then mount was killed due
to out-of-memory. I lost sda2 (or /data) filesystem. Then both sda3
(root) and sda2 gave me. But there's no disk error either in smart or
in syslog.

Jul  8 01:03:18 duo kernel: EXT4-fs (sda3): error count: 2
Jul  8 01:03:18 duo kernel: EXT4-fs (sda3): initial error at
1404773782: ext4_mb_generate_buddy:757
Jul  8 01:03:18 duo kernel: EXT4-fs (sda3): last error at 1404773782:
ext4_mb_generate_buddy:757

Jul  8 01:05:44 duo kernel: EXT4-fs (sda2): error count: 12
Jul  8 01:05:44 duo kernel: EXT4-fs (sda2): initial error at
1404773906: ext4_mb_generate_buddy:757
Jul  8 01:05:44 duo kernel: EXT4-fs (sda2): last error at 1404774058:
ext4_journal_check_start:56

(Thinkpad x60 with Hitachi HTS... SATA disk).

I attach complete syslog from the boot up... it should have everything
relevant.

I'm running fsck -f on sda3 now. I'd like to repair sda2 tommorow.

Best regards,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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