linux-kernel - JBD2: Spotted dirty metadata buffer....

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <1744886.OgPgGFoXj7@stwm.de>
Date:   Mon, 21 Nov 2016 16:28:03 +0100
From:   Wolfgang Walter <linux@...m.de>
To:     Ext4 Developers List <linux-ext4@...r.kernel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>
Subject: JBD2: Spotted dirty metadata buffer....

Hello,

I'm testing EXT4 with an external journal (data=journal). When writing I rather often get

	JBD2: Spotted dirty metadata buffer (dev = dm-22, blocknr = 1008028301). There's a risk of filesystem corruption in case of system crash.

Now other message is logged. If I unmount the filesystem an do an forced fsck, all seems fine.

The filesystem as it's journal are on a LV (which is again backed by DRBD). The journal, too.

Im using stable kernel 4.8.8.

I created the journal with:

	mkfs.ext4 -O journal_dev -v -b 4096  -L jdyn /dev/export/jdyn

I created the filesystem with:

	mkfs.ext4 -J device=UUID=625d871f-c278-4acb-916d-774dc78dbd8a -v -b 4096 -E stride=$((512/4)),stripe_width=$((512/4*3)),lazy_itable_init=0,nodiscard -O inline_data,mmp -L dyn /dev/export/dyn

I tested it also with data=writeback. I didn't see these errors then.

Regards,
-- 
Wolfgang Walter
Studentenwerk München
Anstalt des öffentlichen Rechts