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From: Martin Steigerwald <Martin@lichtvoll.de>
To: linux-btrfs@vger.kernel.org
Subject: Re: kernel got struck while scrubbing BTRFS with node- and leafsize 32768
Date: Sun, 24 Jun 2012 17:02:01 +0200
References: <201206162223.20392.Martin@lichtvoll.de> <201206162238.23317.Martin@lichtvoll.de> <201206162239.07546.Martin@lichtvoll.de> (sfid-20120616_224354_198852_C67F1640)
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Am Samstag, 16. Juni 2012 schrieb Martin Steigerwald:
> Am Samstag, 16. Juni 2012 schrieb Martin Steigerwald:
> > Am Samstag, 16. Juni 2012 schrieb Martin Steigerwald:
> > > merkaba:~> date ; btrfs scrub status /mnt/amazon-daten
> > > Sa 16. Jun 22:06:33 CEST 2012
> > > scrub status for bd94ea73-6e77-4c81-b053-2401b4f52b3e
> > > 
> > >         scrub started at Sat Jun 16 21:44:09 2012, running for 1341
> > > 
> > > seconds total bytes scrubbed: 90.30GB with 0 errors
> > > merkaba:~> date ; btrfs scrub cancel /mnt/amazon-daten
> > > Sa 16. Jun 22:06:47 CEST 2012
> > > [… hangs here …]
> > 
> > btrfs-readahead is stuck:
> > 
> > merkaba:~> ps aux | egrep "(USER| D)"
> > USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME
> > COMMAND root     11920  0.0  0.0      0     0 ?        D    21:46
> > 0:00 [btrfs-readahead] root     13649  0.0  0.0  10544   396 pts/0
> > D+   22:06   0:00 btrfs scrub cancel /mnt/amazon-daten root     16309
> > 0.0  0.0   9816   948 pts/1    S+   22:24   0:00 egrep (USER| D)
> > 
> > I created a bug report with a
> > 
> > kern.log including echo t > /proc/sysrq-trigger with stuck readahead
> 
> There we go:
> 
> Bug 43491 - BTRFS hangs while scrubbing with node- and leafsize 32768
> https://bugzilla.kernel.org/show_bug.cgi?id=43491

With 3.5-rc3 it scrubbed the whole disk now:

merkaba:~> btrfs scrub status /mnt/amazon-daten
scrub status for […]
        scrub started at Sun Jun 24 15:02:15 2012 and finished after 6271 seconds
        total bytes scrubbed: 369.34GB with 0 errors
merkaba:~>

Thus closing.

Will reopen, should it occur again.

Thanks,
-- 
Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
GPG: 03B0 0D6C 0040 0710 4AFA  B82F 991B EAAC A599 84C7