Re: [PATCH 6/7] mm: add CONFIG_DEBUG_VM_RB build option

[Jiri Slaby]

On 09/16/2012 09:07 PM, Hugh Dickins wrote:
>> What was the way that
>> Hugh used to reproduce the other issue?
> 
> I've lost track of which issue is "other".

The other was meant to be the BUG I hit.

> To reproduce Sasha's interval_tree.c warnings, all I had to do was switch
> on CONFIG_DEBUG_VM_RB (I regret not having done so before) and boot up.
> 
> I didn't look to see what was doing the mremap which caused the warning
> until now: surprisingly, it's microcode_ctl.  I've not made much effort
> to get the right set of sources and work out why that would be using
> mremap (a realloc inside a library?).
> 
> I failed to reproduce your BUG in huge_memory.c, but what I was trying
> was SuSE update via yast2, on several machines; but perhaps because
> they were all fairly close to up-to-date, I didn't hit a problem.
> (That was before I turned on DEBUG_VM_RB for Sasha's.)

The good news are that I cannot reproduce either with the patch applied.

thanks,
-- 
js
suse labs
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