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Date: Thu, 24 Sep 2015 15:01:51 -0400
From: Sasha Levin <sasha.levin@oracle.com>
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To: Andrey Ryabinin <ryabinin.a.a@gmail.com>, Oleg Nesterov <oleg@redhat.com>
CC: Hugh Dickins <hughd@google.com>,
        "Kirill A. Shutemov" <kirill@shutemov.name>,
        Andrey Konovalov <andreyknvl@google.com>,
        Rik van Riel <riel@redhat.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Dmitry Vyukov <dvyukov@google.com>,
        "linux-mm@kvack.org" <linux-mm@kvack.org>,
        LKML <linux-kernel@vger.kernel.org>, Vlastimil Babka <vbabka@suse.cz>
Subject: Re: Multiple potential races on vma->vm_flags
References: <55EC9221.4040603@oracle.com>	<20150907114048.GA5016@node.dhcp.inet.fi>	<55F0D5B2.2090205@oracle.com>	<20150910083605.GB9526@node.dhcp.inet.fi>	<CAAeHK+xSFfgohB70qQ3cRSahLOHtamCftkEChEgpFpqAjb7Sjg@mail.gmail.com>	<20150911103959.GA7976@node.dhcp.inet.fi>	<alpine.LSU.2.11.1509111734480.7660@eggly.anvils>	<55F8572D.8010409@oracle.com>	<20150924131141.GA7623@redhat.com>	<5604247A.7010303@oracle.com>	<20150924172609.GA29842@redhat.com> <CAPAsAGx660uSk=WbpWmZR9FpSFXmp3G9yXxRXu65gozu3qT63g@mail.gmail.com>
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On 09/24/2015 02:52 PM, Andrey Ryabinin wrote:
> Sasha, could you confirm that in your kernel mmu_notifier_mm field has
> 0x4c8 offset?
> I would use gdb for that:
> gdb vmlinux
> (gdb) p/x &(((struct mm_struct*)0)->mmu_notifier_mm)

(gdb) p/x &(((struct mm_struct*)0)->mmu_notifier_mm)
$1 = 0x4c8


Thanks,
Sasha