linux-kernel - Re: [2.6.24-rc] pdflush stuck in D state

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Message-ID: <OFACAE304F.F778F5BA-ON8025739B.005B6D78-8025739B.005B9AA8@sophos.com>
Date:	Thu, 22 Nov 2007 16:40:37 +0000
From:	tvrtko.ursulin@...hos.com
To:	linux-kernel@...r.kernel.org
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: [2.6.24-rc] pdflush stuck in D state

linux-kernel-owner@...r.kernel.org wrote on 22/11/2007 16:28:22:

> linux-kernel-owner@...r.kernel.org wrote on 22/11/2007 16:34:01:
> 
> > On Thursday, 22 of November 2007, Tvrtko A. Ursulin wrote:
> > > 
> > > Hi all,
> > > 
> > > So as the subject says - pdflush is stuck i D state which means 
> > constant load 
> > > average of at least one:
> > > 
> > > root       151  0.0  0.0      0     0 ?        D    Nov20   0:33 
> [pdflush]
> > 
> > Hm, this is supposed to be fixed.  Please see:
> > http://bugzilla.kernel.org/show_bug.cgi?id=9323
> 
> Doesn't look like the same bug to me - I have only ever seen pdflush get 

> stuck in D, not random processes.
> 
> Also, I can confirm that -rc3 I am running contains the patch referenced 

> in your bugzilla link above.

Here is a trace for good and bad pdflush processes:

Nov 22 16:35:09 oxygene kernel:  =======================
Nov 22 16:35:09 oxygene kernel: pdflush       S c014fe4e     0   150 2
Nov 22 16:35:09 oxygene kernel:        00000000 00000046 00000000 c014fe4e 
f7c30fa4 c014f9c6 f7ce8560 f7ce869c
Nov 22 16:35:09 oxygene kernel:        c201e100 00000001 fffffffc 00000002 
00000000 00000000 00000000 00000000
Nov 22 16:35:09 oxygene kernel:        00000021 f7c30fc8 c014fe4e 00000000 
00000000 c014ff09 00000202 f7ce8560
Nov 22 16:35:09 oxygene kernel: Call Trace:
Nov 22 16:35:09 oxygene kernel:  [pdflush+0/434] pdflush+0x0/0x1b2
Nov 22 16:35:09 oxygene kernel:  [background_writeout+125/173] 
background_writeout+0x7d/0xad
Nov 22 16:35:09 oxygene kernel:  [pdflush+0/434] pdflush+0x0/0x1b2
Nov 22 16:35:09 oxygene kernel:  [pdflush+187/434] pdflush+0xbb/0x1b2
Nov 22 16:35:09 oxygene kernel:  [kthread+56/96] kthread+0x38/0x60
Nov 22 16:35:09 oxygene kernel:  [kthread+0/96] kthread+0x0/0x60
Nov 22 16:35:09 oxygene kernel:  [kernel_thread_helper+7/16] 
kernel_thread_helper+0x7/0x10
Nov 22 16:35:09 oxygene kernel:  =======================
Nov 22 16:35:09 oxygene kernel: pdflush       D f7c3aef4     0   151 2
Nov 22 16:35:09 oxygene kernel:        0b83b953 00000046 00000002 f7c3aef4 
f7c3aeec 00000000 f7ce8ac0 f7ce8bfc
Nov 22 16:35:09 oxygene kernel:        c201e100 00000001 f7c3af18 0b83b9cc 
f7c3af18 00000003 00000000 00000001
Nov 22 16:35:09 oxygene kernel:        00000000 f7c3af18 0b83b9cc f7c3af70 
00000000 c027ddb7 f781e000 c010490c
Nov 22 16:35:09 oxygene kernel: Call Trace:
Nov 22 16:35:09 oxygene kernel:  [schedule_timeout+112/141] 
schedule_timeout+0x70/0x8d
Nov 22 16:35:09 oxygene kernel:  [apic_timer_interrupt+40/48] 
apic_timer_interrupt+0x28/0x30
Nov 22 16:35:09 oxygene kernel:  [process_timeout+0/5] 
process_timeout+0x0/0x5
Nov 22 16:35:09 oxygene kernel:  [schedule_timeout+107/141] 
schedule_timeout+0x6b/0x8d
Nov 22 16:35:09 oxygene kernel:  [io_schedule_timeout+27/36] 
io_schedule_timeout+0x1b/0x24
Nov 22 16:35:09 oxygene kernel:  [congestion_wait+80/100] 
congestion_wait+0x50/0x64
Nov 22 16:35:09 oxygene kernel:  [autoremove_wake_function+0/53] 
autoremove_wake_function+0x0/0x35
Nov 22 16:35:09 oxygene kernel:  [pdflush+0/434] pdflush+0x0/0x1b2
Nov 22 16:35:09 oxygene kernel:  [wb_kupdate+152/219] wb_kupdate+0x98/0xdb
Nov 22 16:35:09 oxygene kernel:  [pdflush+282/434] pdflush+0x11a/0x1b2
Nov 22 16:35:09 oxygene kernel:  [wb_kupdate+0/219] wb_kupdate+0x0/0xdb
Nov 22 16:35:09 oxygene kernel:  [kthread+56/96] kthread+0x38/0x60
Nov 22 16:35:09 oxygene kernel:  [kthread+0/96] kthread+0x0/0x60
Nov 22 16:35:09 oxygene kernel:  [kernel_thread_helper+7/16] 
kernel_thread_helper+0x7/0x10
Nov 22 16:35:09 oxygene kernel:  =======================

Tvrtko


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