From: Olaf Kirch <okir@suse.de>
Subject: Re: NFS crash on Suse, any ideas on which normal nfs patch could be a cause/fix?
Date: Tue, 14 Jun 2005 13:06:14 +0200
Message-ID: <20050614110614.GH5155@suse.de>
References: <20050610075637.GB5534@suse.de> <EXCHG2003xf4yp8ARf30000046f@EXCHG2003.microtech-ks.com>
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To: Roger Heflin <rheflin@atipa.com>
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Andi Kleen mentioned that this may be a BIOS or driver problem.
Drivers accessing incorrect memory mappings may cause a watchdog to
trigger, which will elicit an MCE.

The address is just over 2GB; the BIOS may have created the
memory hole there. Can you disable memory remapping in the
BIOS?

Olaf


On Fri, Jun 10, 2005 at 03:53:14PM -0500, Roger Heflin wrote:
> We have looked at this more carefully, the customer has
> got me more information and details.   It looks like some
> way nfs exercises a network bug and causes the network driver
> to crash.    The machine/os has survived a full kickstart
> (with a several hundred MB install by 100 plus identical
> machines without that exercising the bug) and a quite a
> bit of light nfs usage, but heavier nfs usage, including
> using bonnie will make the machines fall over fairly quick.
> 
> We are checking for what sort of issues there could be with
> the network driver/network firmware/bmc card.   
> 
> For information this is a Quad Tyan 4882 with 32GB of ram
> (16 have 64GB of ram) with the customer having over 100
> of the Quads.
> 
> There is also a large number of duals, but after further
> examination we don't believe those have the issue.
> 
>                          Roger
> 
> > -----Original Message-----
> > From: Olaf Kirch [mailto:okir@suse.de] 
> > Sent: Friday, June 10, 2005 2:57 AM
> > To: Roger Heflin
> > Cc: nfs@lists.sourceforge.net
> > Subject: Re: [NFS] NFS crash on Suse, any ideas on which 
> > normal nfs patch could be a cause/fix?
> > 
> > On Thu, Jun 09, 2005 at 01:50:13PM -0500, Roger Heflin wrote:
> > > The kernel crash message was:
> > > 
> > > CPU 0: Machine Check Exception:          4 Bank 4: f60da00100000813
> > >   RIP !INEXACT!  10:<ffffffff8022fae2> {copy_user_generic_c0x8/0x26}
> > >   TSC 3d101af6bf756 ADDR 4304010
> > >   Kernel panic: Machine check
> > 
> > This is not an NFS bug, it's a machine check exception. Your 
> > machines have bad RAM it seems.
> > 
> > Olaf
> > -- 
> > Olaf Kirch   |  --- o --- Nous sommes du soleil we love when we play
> > okir@suse.de |    / | \   sol.dhoop.naytheet.ah kin.ir.samse.qurax
> > 
> 
> 
> 
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-- 
Olaf Kirch   |  --- o --- Nous sommes du soleil we love when we play
okir@suse.de |    / | \   sol.dhoop.naytheet.ah kin.ir.samse.qurax


-------------------------------------------------------
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