Re: xfstests 250 fail on newer kernels

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On Sat, Oct 20, 2012 at 08:53:43AM +1100, Dave Chinner wrote:
> On Fri, Oct 19, 2012 at 02:37:30PM -0300, Carlos Maiolino wrote:
> > Hi,
> > 
> > reviewing a patch to xfstests250, I ran it against newer kernels (3.6.0+ and
> > 3.7.0-rc1) and noticed it is failing. i.e. btree is getting corrupted. 
> 
> It's been failing on mainline kernels for a long time. In fact, i
> think it's been failing since it was created. But it's not failing
> due to btree corruption - it's failing because mkfs is not leaving
> enough space in the AG that contains the log for sanity checks to
> pass. i.e. that there are always a minimum of 4 blocks of freespace
> in an AG.
> 
> This is not actually a problem - the log takes the entire AG, so
> allocation will never occur in it, so having less than 4 blocks of
> free space in the AG is just noise in this case. It's never bubbled
> to the top of my list to fix...
> 
> > I'm going to take a look at it, but let me know if anybody has already
> > found/fixed it.
> 
> If it is failing the check_scratch_fs stage, then it is most likely
> the above issue. The corrupted btree problem that the test was
> writen for caused the system to ASSERT fail or crash - i.e. it
> didn't even run to the point of checking the fs....
> 
Yep, that was my point, it's failing on check_scratch_fs stage. The btree
problem has been fixed since it is not triggering the ASSERT. Didn't know it is
failing since its creation :)

I can add it to my todo list if you want some stuff out of yours

> 
> Dave.
> -- 
> Dave Chinner
> david@xxxxxxxxxxxxx
> 
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-- 
--Carlos

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