would be useful.
> Dashi Cao
>
> -Original Message-
> From: Hugh Dickins [mailto:hu...@google.com]
> Sent: Friday, December 23, 2016 6:27 AM
> To: Peter Zijlstra
> Cc: Michal Hocko ; Dashi DS1 Cao ;
> linux...@kvack.org; linux-kernel@vger.kernel.org; Hugh Dickins
>
2016 10:20 PM
To: Dashi DS1 Cao
Cc: Hugh Dickins ; Michal Hocko ;
linux...@kvack.org; linux-kernel@vger.kernel.org
Subject: Re: A small window for a race condition in
mm/rmap.c:page_lock_anon_vma_read
On Fri, Dec 23, 2016 at 02:02:14AM +, Dashi DS1 Cao wrote:
> The kernel version is &qu
On Fri, Dec 23, 2016 at 02:02:14AM +, Dashi DS1 Cao wrote:
> The kernel version is "RELEASE: 3.10.0-327.36.3.el7.x86_64". It was the
> latest kernel release of CentOS 7.2 at that time, or maybe still now.
This would be the point where we ask you to run a recent upstream kernel
and try and rep
On Fri, 23 Dec 2016, Dashi DS1 Cao wrote:
> The kernel version is "RELEASE: 3.10.0-327.36.3.el7.x86_64". It was the
> latest kernel release of CentOS 7.2 at that time, or maybe still now.
Okay, thanks: so, basically a v3.10 kernel, with lots of added patches,
but also lacking many more recent fi
; Dashi DS1 Cao ;
linux...@kvack.org; linux-kernel@vger.kernel.org; Hugh Dickins
Subject: Re: A small window for a race condition in
mm/rmap.c:page_lock_anon_vma_read
On Thu, 22 Dec 2016, Peter Zijlstra wrote:
> On Wed, Dec 21, 2016 at 03:43:43PM +0100, Michal Hocko wrote:
> > anon_vma locking i
; Dashi DS1 Cao ;
linux...@kvack.org; linux-kernel@vger.kernel.org; Hugh Dickins
Subject: Re: A small window for a race condition in
mm/rmap.c:page_lock_anon_vma_read
On Thu, 22 Dec 2016, Peter Zijlstra wrote:
> On Wed, Dec 21, 2016 at 03:43:43PM +0100, Michal Hocko wrote:
> > anon_vma loc
On Thu, 22 Dec 2016, Peter Zijlstra wrote:
> On Wed, Dec 21, 2016 at 03:43:43PM +0100, Michal Hocko wrote:
> > anon_vma locking is clever^Wsubtle as hell. CC Peter...
> >
> > On Tue 20-12-16 09:32:27, Dashi DS1 Cao wrote:
> > > I've collected four crash dumps with similar backtrace.
> > >
> > >
On Wed, Dec 21, 2016 at 03:43:43PM +0100, Michal Hocko wrote:
> anon_vma locking is clever^Wsubtle as hell. CC Peter...
>
> On Tue 20-12-16 09:32:27, Dashi DS1 Cao wrote:
> > I've collected four crash dumps with similar backtrace.
> >
> > PID: 247TASK: 881fcfad8000 CPU: 14 COMMAND: "ks
day, December 22, 2016 7:53 PM
To: Michal Hocko
Cc: linux...@kvack.org; linux-kernel@vger.kernel.org; Peter Zijlstra
Subject: RE: A small window for a race condition in
mm/rmap.c:page_lock_anon_vma_read
I've used another dump with similar backtrace.
PID: 246TASK: 881fd27df300
On Thu 22-12-16 11:53:26, Dashi DS1 Cao wrote:
> I've used another dump with similar backtrace.
Please also dump the anon_vma of the page as well.
--
Michal Hocko
SUSE Labs
ff811a
0x811a340a <+250>: lea0x1(%rcx),%edx
0x811a340d <+253>: mov%ecx,%eax
0x811a340f <+255>: lock cmpxchg %edx,(%rsi)
0xffffffff811a3413 <+259>: cmp %eax,%ecx
0x811a3415 <+261>: je 0x811
anon_vma locking is clever^Wsubtle as hell. CC Peter...
On Tue 20-12-16 09:32:27, Dashi DS1 Cao wrote:
> I've collected four crash dumps with similar backtrace.
>
> PID: 247TASK: 881fcfad8000 CPU: 14 COMMAND: "kswapd1"
> #0 [881fcfad7978] machine_kexec at 81051e9b
> #1 [f
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