linux-kernel - Re: [LKP] [mm/memory.c] 6558038e45: general_protection

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Date:   Wed, 17 Oct 2018 15:26:21 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     kernel test robot <rong.a.chen@...el.com>
Cc:     "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        LKML <linux-kernel@...r.kernel.org>, lkp@...org
Subject: Re: [LKP] [mm/memory.c] 6558038e45: general_protection_fault:#[##]

On Wed, 17 Oct 2018 09:36:00 +0800 kernel test robot <rong.a.chen@...el.com> wrote:

> FYI, we noticed the following commit (built with gcc-6):
> 
> commit: 6558038e4540a22ee4f99a5def74791189102bc0 ("mm/memory.c: recheck page table entry with page table lock held")
> https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master
> 
> in testcase: trinity
> with following parameters:
> 
> 	runtime: 300s
> 
> test-description: Trinity is a linux system call fuzz tester.
> test-url: http://codemonkey.org.uk/projects/trinity/
> 
> 
> on test machine: qemu-system-x86_64 -enable-kvm -cpu qemu64,+ssse3 -smp 4 -m 4G
> 
> caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):

mm-recheck-page-table-entry-with-page-table-lock-held-fix.patch ("mm:
fix the crash observed with syzkaller run") will most likely fix this. 
Was it applied during this testing?