From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: Sasha Levin <sasha.levin@oracle.com>
Cc: Hugh Dickins <hughd@google.com>,
Andrey Konovalov <andreyknvl@google.com>,
Oleg Nesterov <oleg@redhat.com>, Rik van Riel <riel@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
Dmitry Vyukov <dvyukov@google.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Vlastimil Babka <vbabka@suse.cz>
Subject: Re: Multiple potential races on vma->vm_flags
Date: Tue, 15 Sep 2015 22:01:44 +0300 [thread overview]
Message-ID: <20150915190143.GA18670@node.dhcp.inet.fi> (raw)
In-Reply-To: <55F8572D.8010409@oracle.com>
On Tue, Sep 15, 2015 at 01:36:45PM -0400, Sasha Levin wrote:
> On 09/11/2015 09:27 PM, Hugh Dickins wrote:
> > I'm inclined to echo Vlastimil's comment from earlier in the thread:
> > sounds like an overkill, unless we find something more serious than this.
>
> I've modified my tests to stress the exit path of processes with many vmas,
Could you share the test?
> and hit the following NULL ptr deref (not sure if it's related to the original issue):
>
> [1181047.935563] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC KASAN
> [1181047.937223] Modules linked in:
> [1181047.937772] CPU: 4 PID: 21912 Comm: trinity-c341 Not tainted 4.3.0-rc1-next-20150914-sasha-00043-geddd763-dirty #2554
> [1181047.939387] task: ffff8804195c8000 ti: ffff880433f00000 task.ti: ffff880433f00000
> [1181047.940533] RIP: unmap_vmas (mm/memory.c:1337)
Is it "struct mm_struct *mm = vma->vm_mm;"?
--
Kirill A. Shutemov
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WARNING: multiple messages have this Message-ID (diff)
From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: Sasha Levin <sasha.levin@oracle.com>
Cc: Hugh Dickins <hughd@google.com>,
Andrey Konovalov <andreyknvl@google.com>,
Oleg Nesterov <oleg@redhat.com>, Rik van Riel <riel@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
Dmitry Vyukov <dvyukov@google.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Vlastimil Babka <vbabka@suse.cz>
Subject: Re: Multiple potential races on vma->vm_flags
Date: Tue, 15 Sep 2015 22:01:44 +0300 [thread overview]
Message-ID: <20150915190143.GA18670@node.dhcp.inet.fi> (raw)
In-Reply-To: <55F8572D.8010409@oracle.com>
On Tue, Sep 15, 2015 at 01:36:45PM -0400, Sasha Levin wrote:
> On 09/11/2015 09:27 PM, Hugh Dickins wrote:
> > I'm inclined to echo Vlastimil's comment from earlier in the thread:
> > sounds like an overkill, unless we find something more serious than this.
>
> I've modified my tests to stress the exit path of processes with many vmas,
Could you share the test?
> and hit the following NULL ptr deref (not sure if it's related to the original issue):
>
> [1181047.935563] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC KASAN
> [1181047.937223] Modules linked in:
> [1181047.937772] CPU: 4 PID: 21912 Comm: trinity-c341 Not tainted 4.3.0-rc1-next-20150914-sasha-00043-geddd763-dirty #2554
> [1181047.939387] task: ffff8804195c8000 ti: ffff880433f00000 task.ti: ffff880433f00000
> [1181047.940533] RIP: unmap_vmas (mm/memory.c:1337)
Is it "struct mm_struct *mm = vma->vm_mm;"?
--
Kirill A. Shutemov
next prev parent reply other threads:[~2015-09-15 19:01 UTC|newest]
Thread overview: 70+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CAAeHK+z8o96YeRF-fQXmoApOKXa0b9pWsQHDeP=5GC_hMTuoDg@mail.gmail.com>
[not found] ` <55EC9221.4040603@oracle.com>
2015-09-07 11:40 ` Multiple potential races on vma->vm_flags Kirill A. Shutemov
2015-09-07 11:40 ` Kirill A. Shutemov
2015-09-09 15:27 ` Vlastimil Babka
2015-09-09 15:27 ` Vlastimil Babka
2015-09-09 16:01 ` Kirill A. Shutemov
2015-09-09 16:01 ` Kirill A. Shutemov
2015-09-10 0:58 ` Sasha Levin
2015-09-10 0:58 ` Sasha Levin
2015-09-10 8:36 ` Kirill A. Shutemov
2015-09-10 8:36 ` Kirill A. Shutemov
2015-09-10 13:27 ` Andrey Konovalov
2015-09-10 13:27 ` Andrey Konovalov
2015-09-11 10:39 ` Kirill A. Shutemov
2015-09-11 10:39 ` Kirill A. Shutemov
2015-09-11 15:29 ` Vlastimil Babka
2015-09-11 15:29 ` Vlastimil Babka
2015-09-11 16:08 ` Vlastimil Babka
2015-09-11 16:08 ` Vlastimil Babka
2015-09-12 1:27 ` Hugh Dickins
2015-09-12 1:27 ` Hugh Dickins
2015-09-14 10:16 ` Kirill A. Shutemov
2015-09-14 10:16 ` Kirill A. Shutemov
2015-09-15 17:36 ` Sasha Levin
2015-09-15 17:36 ` Sasha Levin
2015-09-15 19:01 ` Kirill A. Shutemov [this message]
2015-09-15 19:01 ` Kirill A. Shutemov
2015-09-22 16:47 ` Andrey Konovalov
2015-09-22 16:47 ` Andrey Konovalov
2015-09-22 18:54 ` Hugh Dickins
2015-09-22 18:54 ` Hugh Dickins
2015-09-22 19:45 ` Andrey Konovalov
2015-09-22 19:45 ` Andrey Konovalov
2015-09-23 1:39 ` Hugh Dickins
2015-09-23 1:39 ` Hugh Dickins
2015-09-23 11:46 ` Kirill A. Shutemov
2015-09-23 11:46 ` Kirill A. Shutemov
2015-09-23 22:58 ` Davidlohr Bueso
2015-09-23 22:58 ` Davidlohr Bueso
2015-09-23 13:08 ` Andrey Konovalov
2015-09-23 13:08 ` Andrey Konovalov
2015-09-24 0:42 ` Sasha Levin
2015-09-24 0:42 ` Sasha Levin
2015-09-25 19:33 ` Kirill A. Shutemov
2015-09-25 19:33 ` Kirill A. Shutemov
2015-10-13 22:38 ` Hugh Dickins
2015-10-13 22:38 ` Hugh Dickins
2015-10-13 22:33 ` Hugh Dickins
2015-10-13 22:33 ` Hugh Dickins
2015-10-15 16:58 ` Andrey Konovalov
2015-10-15 16:58 ` Andrey Konovalov
2015-09-23 21:30 ` Sasha Levin
2015-09-23 21:30 ` Sasha Levin
2015-09-25 14:26 ` Oleg Nesterov
2015-09-25 14:26 ` Oleg Nesterov
2015-09-24 13:11 ` Oleg Nesterov
2015-09-24 13:11 ` Oleg Nesterov
2015-09-24 16:27 ` Sasha Levin
2015-09-24 16:27 ` Sasha Levin
2015-09-24 17:26 ` Oleg Nesterov
2015-09-24 17:26 ` Oleg Nesterov
2015-09-24 18:52 ` Andrey Ryabinin
2015-09-24 18:52 ` Andrey Ryabinin
2015-09-24 19:01 ` Sasha Levin
2015-09-24 19:01 ` Sasha Levin
2015-09-25 12:41 ` Oleg Nesterov
2015-09-25 12:41 ` Oleg Nesterov
2015-09-23 15:34 ` Oleg Nesterov
2015-09-23 15:34 ` Oleg Nesterov
2015-09-23 15:38 ` Oleg Nesterov
2015-09-23 15:38 ` Oleg Nesterov
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