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Date: Mon, 27 Sep 2010 05:10:56 -0400 (EDT)
From: caiqian@redhat.com
To: =?utf-8?Q?Am=C3=A9rico_Wang?= <xiyou.wangcong@gmail.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>,
        Hugh Dickins <hugh@veritas.com>, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org, Rik van Riel <riel@redhat.com>,
        Andrew Morton <akpm@linux-foundation.org>
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Subject: Re: [PATCH 0/3] Generic support for revoking mappings
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----- "Américo Wang" <xiyou.wangcong@gmail.com> wrote:

> On Mon, Sep 27, 2010 at 04:52:29AM -0400, CAI Qian wrote:
> >Just a head up. Tried to boot latest mmotm kernel with those patches
> applied hit this. I am wondering what I did wrong.
> >
> 
> You missed the header of this oops/warning/bug, is that a BUG_ON or
> WARN_ON or other thing?
Oh, sorry. Here it is,
BUG: unable to handle kernel paging request at ffffffffffffffc0
IP: [<ffffffff811d4c78>] prio_tree_insert+0x188/0x2a0
PGD 1827067 PUD 1828067 PMD 0 
Oops: 0000 [#1] SMP 
last sysfs file: 
CPU 5 

> 
> 
> >Pid: 1, comm: init Not tainted 2.6.36-rc5-mm1+ #2 /KVM
> >RIP: 0010:[<ffffffff811d4c78>]  [<ffffffff811d4c78>]
> prio_tree_insert+0x188/0x2a0
> >RSP: 0018:ffff880c3b1bfcd8  EFLAGS: 00010202
> >RAX: ffff880c374b40d8 RBX: 0000000000000100 RCX: ffff880c374b40d8
> >RDX: 0000000000000179 RSI: 0000000000000000 RDI: 0000000000000179
> >RBP: ffff880c9f4ba188 R08: 0000000000000001 R09: ffff880c374b9330
> >R10: 0000000000000001 R11: 0000000000000002 R12: ffff880c374b40d8
> >R13: 00000007fa7367ba R14: 00000007fa7367be R15: 0000000000000000
> >FS:  00007fa7369d9700(0000) GS:ffff8800df540000(0000)
> knlGS:0000000000000000
> >CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> >CR2: ffffffffffffffc0 CR3: 0000000c374b1000 CR4: 00000000000006e0
> >DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> >DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> >Process init (pid: 1, threadinfo ffff880c3b1be000, task
> ffff880c3b1bd400)
> >Stack:
> > ffff880c3b1bd400 ffff880c374b4088 ffff880c374b40d8 ffff880c374b4088
> ><0> ffff880c9f4ba168 ffff880c9f4ba188 ffff880c374b3680
> ffffffff810daff8
> ><0> 0000000000000002 ffff880c374b41f8 ffff880c374b42b0
> ffffffff810e9171
> >Call Trace:
> > [<ffffffff810daff8>] ? vma_prio_tree_insert+0x28/0x120
> > [<ffffffff810e9171>] ? vma_adjust+0xe1/0x560
> > [<ffffffff8119715b>] ? avc_has_perm+0x6b/0xa0
> > [<ffffffff810e97b9>] ? __split_vma+0x1c9/0x250
> > [<ffffffff810ebf88>] ? mprotect_fixup+0x708/0x7b0
> > [<ffffffff810e4aca>] ? handle_mm_fault+0x1da/0xcf0
> > [<ffffffff81033910>] ? pvclock_clocksource_read+0x50/0xc0
> > [<ffffffff81047220>] ? __dequeue_entity+0x40/0x50
> > [<ffffffff81198a31>] ? file_has_perm+0xf1/0x100
> > [<ffffffff810ec1b2>] ? sys_mprotect+0x182/0x250
> > [<ffffffff8100aec2>] ? system_call_fastpath+0x16/0x1b
> >Code: 56 20 e9 d4 fe ff ff bb 01 00 00 00 48 d3 e3 48 85 db 0f 84 08
> 01 00 00 45 31 ff 66 45 85 c0 4c 89 e1 74 78 0f 1f 80 00 00 00 00 <48>
> 8b 46 c0 48 2b 46 b8 4c 8b 6e 40 48 c1 e8 0c 4c 39 ef 4d 8d 
> >RIP  [<ffffffff811d4c78>] prio_tree_insert+0x188/0x2a0
> > RSP <ffff880c3b1bfcd8>
> >CR2: ffffffffffffffc0
> >---[ end trace 667258bb79b38e02 ]---
> >
> 
> Looks like something wrong in page fault.