Re: INFO: task pdflush:393 blocked for more than 120 seconds. & Call traces ... (fwd)

["Mr. James W. Laferriere" <babydr@xxxxxxxxxxxxxxxx>]

	Hello Neil ,

On Tue, 22 Jul 2008, Neil Brown wrote:
> On Monday July 21, babydr@xxxxxxxxxxxxxxxx wrote:
> > INFO: task pdflush:393 blocked for more than 120 seconds.
> > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> > pdflush       D c8209f80  4748   393      2
> >          f75e5e58 00000046 f7f7ad50 c8209f80 f7f7a8a0 f75e5e24 c014fc57 00000000
> >          f7f7a8a0 e5d0dd00 c8209f80 f75e4000 c0819e00 c8209f80 f7f7aaf4 f75e5e44
> >          00000286 f75e5e80 f510de30 f75e5e58 c0142233 f510de00 f75e5e80 f510de30
> > Call Trace:
> >    [<c014fc57>] ? mark_held_locks+0x67/0x80
> >    [<c0142233>] ? add_wait_queue+0x33/0x50
> >    [<c03a7f85>] xfs_buf_wait_unpin+0xb5/0xe0
> >    [<c0127a60>] ? default_wake_function+0x0/0x10
> >    [<c0127a60>] ? default_wake_function+0x0/0x10
> >    [<c03a84fb>] xfs_buf_iorequest+0x4b/0x80
> >    [<c03adeee>] xfs_bdstrat_cb+0x3e/0x50
> >    [<c03a495c>] xfs_bwrite+0x5c/0xe0
> >    [<c039e941>] xfs_syncsub+0x121/0x2b0
> >    [<c018a43b>] ? lock_super+0x1b/0x20
> >    [<c018a43b>] ? lock_super+0x1b/0x20
> >    [<c039e1d8>] xfs_sync+0x48/0x70
> >    [<c03af833>] xfs_fs_write_super+0x23/0x30
> >    [<c018a80f>] sync_supers+0xaf/0xc0
>
> Looks a lot like an XFS problem to me.
> Or at least, XFS people would be able to interpret this stack the
> best.
	Hmm ,  Ok ,  I'll post there ,  I can provide a -complete- boot -> 
renboot log of the actions ,  But it ain't small ~ 649K .  So I'll post that on 
the back of my website , ie:

http://www.baby-dragons.com/bonnie++1.03c-2.6.26-rc9.console.trace.log

	This includes the Sysrq-w & sysrq-b outputs at the bottom .
	If you're interested in that kind of thing ;-) .


> >    [<c0169259>] wb_kupdate+0x29/0x100
> >    [<c016a0cc>] ? __pdflush+0xcc/0x1a0
> >    [<c016a0d2>] __pdflush+0xd2/0x1a0
> >    [<c016a1a0>] ? pdflush+0x0/0x40
> >    [<c016a1d1>] pdflush+0x31/0x40
> >    [<c0169230>] ? wb_kupdate+0x0/0x100
> >    [<c016a1a0>] ? pdflush+0x0/0x40
> >    [<c0141e2c>] kthread+0x5c/0xa0
> >    [<c0141dd0>] ? kthread+0x0/0xa0
> >    [<c0103d67>] kernel_thread_helper+0x7/0x10
> >    =======================
> > 2 locks held by pdflush/393:
> >    #0:  (&type->s_umount_key#17){----}, at: [<c018a7b2>] sync_supers+0x52/0xc0
> >    #1:  (&type->s_lock_key#7){--..}, at: [<c018a43b>] lock_super+0x1b/0x20
> >
> >     ...snip... Repeats of above message ad-infintum .
>
>
> Hmm... I guess I clipped a bit too much for our XFS friends to know
> the context.
> bonnie is being run on an XFS filesystem on md/raid6. and it gets
> this warning a lot and essentially hangs.
> NeilBrown
	Nah ,  wasn't you who did the clipping t'was me .  in order to get the 
size of the original message below ~ 80K .

		Tnx ,  JimL
--
+------------------------------------------------------------------+
| James   W.   Laferriere | System    Techniques | Give me VMS     |
| Network&System Engineer | 2133    McCullam Ave |  Give me Linux  |
| babydr@xxxxxxxxxxxxxxxx | Fairbanks, AK. 99701 |   only  on  AXP |
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