Re: Xfs Access to block zero exception and system crash

[Sagar Borikar <sagar_borikar@pmc-sierra.com>]

Eric Sandeen wrote:
> Sagar Borikar wrote:
>
>
>   
>> Could you kindly try with my test? I presume you should see failure 
>> soon. I tried this on
>> 2 different x86 systems 2 times ( after rebooting the system ) and I saw 
>> it every time.
>>     
>
>
> Sure.  Is there a reason you're doing this on a loopback file?  That
> probably stresses the vm a bit more, and might get even trickier if the
> loopback file is sparse...
>   
Initially I thought to do that since I didn't want to have a strict 
allocation limit but
allowing allocations to  grow as needed until the backing filesystem 
runs out of free space
due to type of the test case I had. But then I dropped the plan and 
created a non-sparse
loopback device. There was no specific reason to create loopback but as 
it was
simplest option to do it.
> But anyway, on an x86_64 machine with 2G of memory and a non-sparse 10G
> loopback file on 2.6.24.7-92.fc8, your test runs w/o problems for me,
> though the system does get sluggish.  I let it run a bit then ran repair
> and it found no problems, I'll run it overnight to see if anything else
> turns up.
>   
That will be great.  Thanks indeed.
Sagar

> -Eric
>