linux-kernel - Re: oops in pgtable_trans_huge

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Date:	Wed, 11 Dec 2013 14:59:24 -0500
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Vlastimil Babka <vbabka@...e.cz>, Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	linux-mm@...ck.org, kirill.shutemov@...ux.intel.com
Subject: Re: oops in pgtable_trans_huge_withdraw

On 12/11/2013 10:54 AM, Sasha Levin wrote:
> On 12/11/2013 10:40 AM, Vlastimil Babka wrote:
>> On 12/06/2013 10:02 PM, Dave Jones wrote:
>>> I've spent a few days enhancing trinity's use of mmap's, trying to make it
>>> reproduce https://lkml.org/lkml/2013/12/4/499
>>
>> FYI, I managed to reproduce that using trinity today,
>> trinity was from git at commit e8912cc which is from Dec 09 so I guess your enhancements were
>> already there?
>> kernel was linux-next-20131209
>> I was running trinity -c mmap -c munmap -c mremap -c remap_file_pages -c mlock -c munlock
>>
>> Now I'm running with Kirill's patch, will post results later.
>>
>> My goal was to reproduce Sasha Levin's BUG in munlock_vma_pages_range
>> https://lkml.org/lkml/2013/12/7/130
>>
>> Perhaps it could be related as well.
>> Sasha, do you know at which commit your trinity clone was at?
>
> Didn't think those two were related. I've hit this one when I've started fuzzing too, but
> Kirill's patch solved it - so I've mostly ignored it.
>
> Trinity is usually pulled and updated before testing, so it's at whatever the latest Dave
> has pushed.

I can't seem to get kexec tools to properly work with the weird layout KVM tools creates for
the guest kernel.

I'd be happy to try out any debug patches sent my way, this reproduces rather easily.


Thanks,
Sasha

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