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Re: Xfs Access to block zero exception and system crash

To: Sagar Borikar <sagar_borikar@xxxxxxxxxxxxxx>
Subject: Re: Xfs Access to block zero exception and system crash
From: Eric Sandeen <sandeen@xxxxxxxxxxx>
Date: Sun, 06 Jul 2008 22:47:14 -0500
Cc: Dave Chinner <david@xxxxxxxxxxxxx>, Nathan Scott <nscott@xxxxxxxxxx>, xfs@xxxxxxxxxxx
In-reply-to: <48719093.3060907@pmc-sierra.com>
References: <486B01A6.4030104@pmc-sierra.com> <20080702051337.GX29319@disturbed> <486B13AD.2010500@pmc-sierra.com> <1214979191.6025.22.camel@verge.scott.net.au> <20080702065652.GS14251@build-svl-1.agami.com> <486B6062.6040201@pmc-sierra.com> <486C4F89.9030009@sandeen.net> <486C6053.7010503@pmc-sierra.com> <486CE9EA.90502@sandeen.net> <486DF8F0.5010700@pmc-sierra.com> <20080704122726.GG29319@disturbed> <340C71CD25A7EB49BFA81AE8C839266702997641@BBY1EXM10.pmc_nt.nt.pmc-sierra.bc.ca> <486E5F4D.1010009@sandeen.net> <340C71CD25A7EB49BFA81AE8C839266702997658@BBY1EXM10.pmc_nt.nt.pmc-sierra.bc.ca> <486FA095.1050106@sandeen.net> <340C71CD25A7EB49BFA81AE8C839266702A084A6@BBY1EXM10.pmc_nt.nt.pmc-sierra.bc.ca> <487117FC.9090109@sandeen.net> <4871872B.9060107@pmc-sierra.com> <487187D2.8080105@sandeen.net> <4871885B.6090208@pmc-sierra.com> <48718977.1090005@sandeen.net> <48718AB6.80709@pmc-sierra.com> <48718BF0.2040700@sandeen.net> <48719093.3060907@pmc-sierra.com>
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Sagar Borikar wrote:


> Ok. So initially our multi client iozone stress test used to fail. 

Are these multiple nfs clients?

> But 
> as it took 2-3 days
> to replicate the issue, I tried the test, standalone on MIPS and 

the iozone test again?

> observed similar failures which
> I used to get in multi client test. The test is exactly same what I do 
> in mutli client
> iozoen over network. Hence I came to conclusion that if we fix system to 
> pass my test case
> then we can try iozone test with that fix.  And now on x86 with 2.6.24, 
> I am finding similar deadlock but
> the system is responsive and there are no lockups or exceptions. Do you 
> observe similar failures on x86
> at your setup? 

So far I've not seen the deadlocks.

> Also do you think the issues which I am seeing on x86 and 
> MIPS are coming from the
> same sources?

hard to say at this point, I think.

-Eric

> Thanks
> Sagar
> 


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