linux-kernel - BUG Re: mm: vma_merge: fix vm_page_prot SMP race condition against rmap

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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