From: Marcin M <gmane@mejor.pl>
To: linux-ext4@vger.kernel.org
Subject: kernel thread "flush-254:12" eats 100% CPU
Date: Wed, 07 Sep 2011 17:46:37 +0200 [thread overview]
Message-ID: <j483kt$en1$1@dough.gmane.org> (raw)
Hello!
I hope i'm writing to correct place (but i suspect g.l.kernel list could
be proper also) :)
I'm observing situation like in subject. From time to time
"flush-254:12" takes 100% of cpu for a couple of minutes. Then
everything becomes ok.
This problem appears on my two different boxes.
box A)
bare metal, i686, hardened-kernel-2.6.{37-38}
on this box kernel thread never stops to do 100% of cpu. I've to reboot
box (using sysrq, because i could't even umount partition associated
with this thread)
My workarround for it: i changed ext4 to xfs on dm device and problem
disappeared
box B)
xen, full virtualization, x86_64, kernels:
hardened-kernel-{2.6.39,3.0.3,3.0.4} and 3.1.0-rc4-git2
problem is as i described above, flush took one cpu for a couple minutes
and then everythings works correctly.
And again, 254-12 device is ext4 filesystem.
In both cases it was used lvm. At box B, additionaly i'm using dmcrypt.
Box B is configured in this way: sda->lvm2->dmcrypt->filesystem.
How can i help to debug this problem? Or maybe it's fixed already?
Regards,
Marcin.
next reply other threads:[~2011-09-07 17:16 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-07 15:46 Marcin M [this message]
2011-09-07 17:27 ` kernel thread "flush-254:12" eats 100% CPU Marcin M
2011-09-08 5:15 ` Tao Ma
2011-09-08 9:45 ` Marcin M
2011-09-26 13:50 ` Marcin M
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