x86_64: pdflush: page allocation failure. order:0, mode:0x20

["Richard F. Rebel" <rrebel@whenu.com>]

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Hello,

We recently replaced a dual processor intel system with a dual opteron
250 one.  The new system is running 2.6.3-16 (from our mdk distro).

We have noticed about once a day the system wedges.  Today we got some
debugging info in dmesg.  I cannot list all processes (only some then it
wedges), I can't kill many processes (they never die), and I cannot
reboot.  A hardware reset is required.

We are using XFS on an MD stripe containing 6 disks.  Some directories
on the this filesystem cause ls to wedge when run on them.

If it matters, yes we have 1000bt cards that we do a lot of NFS traffic
over, but no special settings for large frames have been activated.

I saw a similar thread from earlier this year suggesting I increase
/proc/sys/vm/min_free_kbytes, which I did to no avail.

Any insight is appreciated.

pdflush: page allocation failure. order:0, mode:0x20

Call Trace:[<ffffffff80158cba>] [<ffffffff80158dc4>]
[<ffffffff80137340>] 
       [<ffffffff8015bbe7>] [<ffffffff8015c0c6>] [<ffffffffa000c039>] 
       [<ffffffffa000ffef>] [<ffffffff802358e5>] [<ffffffff8023974c>] 
       [<ffffffff80238293>] [<ffffffff80137340>] [<ffffffff802383c0>] 
       [<ffffffff801778ed>] [<ffffffffa0093de3>] [<ffffffffa009442c>] 
       [<ffffffff801322f0>] [<ffffffff801322f0>] [<ffffffffa0098ba5>] 
       [<ffffffffa00948b6>] [<ffffffffa0073b0d>] [<ffffffffa008b595>] 
       [<ffffffffa0099c09>] [<ffffffff8019223a>] [<ffffffff80192753>] 
       [<ffffffff80192885>] [<ffffffff801595d0>] [<ffffffff80159b1f>] 
       [<ffffffff80159550>] [<ffffffff80110327>] [<ffffffff801599d0>] 
       [<ffffffff8011031f>] 
pdflush: page allocation failure. order:0, mode:0x20

Call Trace:[<ffffffff80158cba>] [<ffffffff80158dc4>]
[<ffffffff8015bbe7>] 
       [<ffffffff8015c0c6>] [<ffffffffa000c039>] [<ffffffffa000ffef>] 
       [<ffffffff802358e5>] [<ffffffff80238eec>] [<ffffffff8023673d>] 
       [<ffffffffa009442c>] [<ffffffff801322f0>] [<ffffffff801322f0>] 
       [<ffffffffa0098ba5>] [<ffffffffa00948b6>] [<ffffffffa0073b0d>] 
       [<ffffffffa008b595>] [<ffffffffa0099c09>] [<ffffffff8019223a>] 
       [<ffffffff80192753>] [<ffffffff80192885>] [<ffffffff801595d0>] 
       [<ffffffff80159b1f>] [<ffffffff80159550>] [<ffffffff80110327>] 
       [<ffffffff801599d0>] [<ffffffff8011031f>] 


-- 
Richard F. Rebel
rrebel@whenu.com
t. 212.239.0000

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