Date:	Sun, 6 Oct 2013 07:44:30 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org
Subject: [x86] BUG: unable to handle kernel paging request at 00740060

Greetings,

I got the below dmesg and the first bad commit is

commit 0c44c2d0f459cd7e275242b72f500137c4fa834d
Author: Peter Zijlstra <peterz@...radead.org>
Date:   Wed Sep 11 15:19:24 2013 +0200

    x86: Use asm goto to implement better modify_and_test() functions
    
    Linus suggested using asm goto to get rid of the typical SETcc + TEST
    instruction pair -- which also clobbers an extra register -- for our
    typical modify_and_test() functions.
    
    Because asm goto doesn't allow output fields it has to include an
    unconditinal memory clobber when it changes a memory variable to force
    a reload.
    
    Luckily all atomic ops already imply a compiler barrier to go along
    with their memory barrier semantics.
    
    Suggested-by: Linus Torvalds <torvalds@...ux-foundation.org>
    Signed-off-by: Peter Zijlstra <peterz@...radead.org>
    Link: http://lkml.kernel.org/n/tip-0mtn9siwbeo1d33bap1422se@git.kernel.org
    Signed-off-by: Ingo Molnar <mingo@...nel.org>

[    3.336040] Write protecting the kernel read-only data: 2644k
[    3.336982] NX-protecting the kernel data: 6152k
[    3.375173] BUG: unable to handle kernel paging request at 00740060
[    3.376162] IP: [<81053fc4>] task_work_run+0x54/0xa0
[    3.376837] *pdpt = 00000000072e1001 *pde = 0000000000000000 
[    3.377579] Oops: 0000 [#1] DEBUG_PAGEALLOC
[    3.378158] CPU: 0 PID: 85 Comm: hostname Not tainted 3.12.0-rc2-next-20130927-03100-ga0cf1ab #5
[    3.378206] task: 8730c000 ti: 8730e000 task.ti: 8730e000
[    3.378206] EIP: 0060:[<81053fc4>] EFLAGS: 00010206 CPU: 0
[    3.378206] EIP is at task_work_run+0x54/0xa0
[    3.378206] EAX: 00740060 EBX: 87309000 ECX: 00000000 EDX: 00740060
[    3.378206] ESI: 8730c388 EDI: 8730c000 EBP: 8730ff40 ESP: 8730ff34
[    3.378206]  DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068
[    3.378206] CR0: 8005003b CR2: 00740060 CR3: 072d7000 CR4: 000006b0
[    3.378206] Stack:
[    3.378206]  ffffffff 87308058 8730c000 8730ff8c 81039315 77675fb8 8105af7b 00000000
[    3.378206]  8730ffac 00000001 6c0e41a5 61636f6c 736f686c 6f6c2e74 646c6163 8730c398
[    3.378206]  815fc8fe 81022f40 00000000 00000000 872f1880 8730c000 8730ffa4 81039a0a
[    3.378206] Call Trace:
[    3.378206]  [<81039315>] do_exit+0x2a5/0x910
[    3.378206]  [<8105af7b>] ? up_write+0x1b/0x30
[    3.378206]  [<815fc8fe>] ? restore_all+0xf/0xf
[    3.378206]  [<81022f40>] ? kvm_read_and_reset_pf_reason+0x40/0x40
[    3.378206]  [<81039a0a>] do_group_exit+0x4a/0xa0
[    3.378206]  [<81039a78>] SyS_exit_group+0x18/0x20
[    3.378206]  [<815fcf50>] sysenter_do_call+0x12/0x3c
[    3.378206] Code: 36 31 c9 89 d0 0f b1 0e 39 c2 75 eb 85 d2 74 5c 8d b4 26 00 00 00 00 f3 90 8b 87 c0 03 00 00 85 c0 74 f4 31 db eb 04 89 d3 89 c2 <8b> 02 89 1a 85 c0 75 f4 eb 16 66 90 f6 47 0c 04 74 c4 b9 f0 af
[    3.378206] EIP: [<81053fc4>] task_work_run+0x54/0xa0 SS:ESP 0068:8730ff34
[    3.378206] CR2: 0000000000740060
[    3.394549] ---[ end trace a6f697254c888db0 ]---

git bisect start 45c4ea0c4c1b8abffb575b865243fd1c69bbecd9 v3.11 --
git bisect good 39eda2aba6be642b71f2e0ad623dcb09fd9d79cf  # 22:41     20+  Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc
git bisect good bff157b3ad4b9f6be0af6987fcd62deaf0f2b799  # 22:47     20+  Merge branch 'slab/next' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/linux
git bisect good f659a4f17bbecdbad57dd5c63a1783e5ec5fd792  # 22:51     20+  Merge remote-tracking branch 'drm-intel/for-linux-next'
git bisect  bad 6405cd58ac5c0a6ed5f4f1308892147870b9d5cf  # 22:54      0-  Merge remote-tracking branch 'regmap/for-next'
git bisect good 5094001bc464c12d3e04eb73a5e0d5e8436f09f7  # 22:59     20+  Merge remote-tracking branch 'omap_dss2/for-next'
git bisect good 8f31410ee9917e8648c7cf7f45e22320c166998a  # 23:01     20+  Merge remote-tracking branch 'spi/for-next'
git bisect  bad 6f014a7ea91f80f765ba700dcd1728680ba5c58e  # 23:04      0-  Merge remote-tracking branch 'tip/auto-latest'
git bisect  bad bce56fbc0f165658f7e0715fedc8d39840bae31c  # 23:07      0-  Merge branch 'sched/core'
git bisect  bad c2daa3bed53a81171cf8c1a36db798e82b91afe8  # 23:10      0-  sched, x86: Provide a per-cpu preempt_count implementation
git bisect good 4314895165623879937f46d767673654662b570c  # 23:15     20+  sched: Micro-optimize by dropping unnecessary task_rq() calls
git bisect  bad 4a2b4b222743bb07fedf985b884550f2ca067ea9  # 23:18      0-  sched: Introduce preempt_count accessor functions
git bisect  bad b021fe3e25094fbec22d0eff846d2adeee1b9736  # 23:21      0-  sched, rcu: Make RCU use resched_cpu()
git bisect  bad 0c44c2d0f459cd7e275242b72f500137c4fa834d  # 23:22      0-  x86: Use asm goto to implement better modify_and_test() functions
git bisect good 4314895165623879937f46d767673654662b570c  # 23:25     60+  sched: Micro-optimize by dropping unnecessary task_rq() calls
git bisect  bad a0cf1abc25ac197dd97b857c0f6341066a8cb1cf  # 23:25      0-  Add linux-next specific files for 20130927
git bisect good 7dee8dff47734ee52da2cd8b8ea9736e42c5062f  # 23:32     60+  Merge tag 'pm+acpi-3.12-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
git bisect  bad a0cf1abc25ac197dd97b857c0f6341066a8cb1cf  # 23:32      0-  Add linux-next specific files for 20130927

Thanks,
Fengguang

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