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Message-ID: <CAJ48U8XgWQZBFuWt2Gk_5JAXz3wONgd15OmBY0M-Urq+_VGe9A@mail.gmail.com>
Date: Tue, 27 Sep 2016 05:16:15 -0500
From: Shaun Tancheff <shaun@...cheff.com>
To: Andrea Arcangeli <aarcange@...hat.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
Vlastimil Babka <vbabka@...e.cz>,
Michal Hocko <mhocko@...e.com>, Ingo Molnar <mingo@...nel.org>,
Dave Hansen <dave.hansen@...ux.intel.com>,
Dan Williams <dan.j.williams@...el.com>,
Johannes Weiner <hannes@...xchg.org>,
Joonsoo Kim <iamjoonsoo.kim@....com>,
Konstantin Khlebnikov <koct9i@...il.com>,
Chen Gang <gang.chen.5i5j@...il.com>,
Shaun Tancheff <shaun@...cheff.com>,
Andrey Ryabinin <aryabinin@...tuozzo.com>,
Thomas Gleixner <tglx@...utronix.de>,
Mel Gorman <mgorman@...hsingularity.net>,
Piotr Kwapulinski <kwapulinski.piotr@...il.com>,
linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>,
Shaun Tancheff <shaun.tancheff@...gate.com>
Subject: BUG Re: mm: vma_merge: fix vm_page_prot SMP race condition against rmap_walk
git bisect points at commit c9634dcf00c9c93b ("mm: vma_merge: fix
vm_page_prot SMP race condition against rmap_walk")
Last lines to console are [transcribed]:
vma ffff8c3d989a7c78 start 00007fe02ed4c000 end 00007fe02ed52000
next ffff8c3d96de0c38 prev ffff8c3d989a6e40 mm ffff8c3d071cbac0
prot 8000000000000025 anon_vma ffff8c3d96fc9b28 vm_ops (null)
pgoff 7fe02ed4c file (null) private_data (null)
flags: 0x8100073(read|write|mayread|maywrite|mayexec|account|softdirty)
Reproducer is an Ubuntu 16.04.1 LTS x86_64 running on a VM (VirtualBox).
Symptom is a solid hang after boot and switch to starting gnome session.
Hang at about 35s.
kdbg traceback is all null entries.
Let me know what additional information I can provide.
Regards,
Shaun Tancheff
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