linux-kernel - [signal] double fault

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Date:	Mon, 10 Sep 2012 08:59:38 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Al Viro <viro@...iv.linux.org.uk>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: [signal] double fault

FYI. As much messages as I can provide as debug aids.

x86_64-randconfig-s283      b______b___b_BBBBBB

--
12:	  f411932  
13:	B c2865bb  2012-09-10 kvm-xgwo     [    2.986734] double fault: 0000 [#1] SMP DEBUG_PAGEALLOC [kvm_read_and_reset_pf_reason __might_sleep down_read exit_mm do_exit kmsg_dump oops_end die do_double_fault double_fault do_early_param restore_args kvm_read_and_reset_pf_reason]
14:	B 549bf9c  2012-09-10 kvm-inn      [    2.157552] double fault: 0000 [#1] SMP DEBUG_PAGEALLOC 
15:	B 4e382ff  2012-09-10 kvm-waimea   [    1.557638] double fault: 0000 [#1] SMP DEBUG_PAGEALLOC 
16:	B 23ddf94  2012-09-10 kvm-stoakley [    2.668934] double fault: 0000 [#1] SMP DEBUG_PAGEALLOC 
17:	B f117e2a  2012-09-10 kvm-bay      [    4.708123] double fault: 0000 [#1] SMP DEBUG_PAGEALLOC 
18:	B a392720  2012-09-10 kvm-inn      [    3.552055] double fault: 0000 [#1] SMP DEBUG_PAGEALLOC 
18:	B a392720  2012-09-10 kvm-inn      [    4.733891] double fault: 0000 [#1] SMP DEBUG_PAGEALLOC 
18:	B a392720  2012-09-10 kvm-inn      [    3.830683] double fault: 0000 [#1] SMP DEBUG_PAGEALLOC 
18:	B a392720  2012-09-10 kvm-inn      [    3.621099] double fault: 0000 [#1] SMP DEBUG_PAGEALLOC 
18:	B a392720  2012-09-10 kvm-inn      [    4.465551] double fault: 0000 [#1] SMP DEBUG_PAGEALLOC 
18:	B a392720  2012-09-10 kvm-slim     [    2.608424] double fault: 0000 [#1] SMP DEBUG_PAGEALLOC [page_fault show_stack_log_lvl show_regs __die die do_double_fault double_fault do_early_param restore_args page_fault]
18:	B a392720  2012-09-10 kvm-xbm      [    3.616011] double fault: 0000 [#1] SMP DEBUG_PAGEALLOC [async_page_fault show_stack_log_lvl show_regs __die die do_double_fault double_fault do_early_param restore_args async_page_fault]
18:	B a392720  2012-09-10 kvm-xbm      [    3.106986] double fault: 0000 [#1] SMP DEBUG_PAGEALLOC 
18:	B a392720  2012-09-10 kvm-xgwo     [    3.029775] WARNING: at /c/kernel-tests/src/tip/kernel/lockdep.c:3122 __lock_acquire.isra.24+0xb4b/0xb80() [kvm_read_and_reset_pf_reason __might_sleep down_read exit_mm do_exit kmsg_dump oops_end die do_double_fault double_fault do_early_param restore_args kvm_read_and_reset_pf_reason]

[    2.976892] hd: no drives specified - use hd=cyl,head,sectors on kernel command line
[    2.980146] debug: unmapping init [mem 0xffffffff81b96000-0xffffffff81dd9fff]
[    2.986734] double fault: 0000 [#1] SMP DEBUG_PAGEALLOC
[    2.987767] Modules linked in:
[    2.988348] CPU 1 
[    2.988568] Pid: 1, comm: init Not tainted 3.6.0-rc3-00182-gc2865bb #44  
[    2.988568] RIP: 0010:[<ffffffff81052e33>]  [<ffffffff81052e33>] kvm_read_and_reset_pf_reason+0x13/0x60
[    2.988568] RSP: 0018:ffff880000000028  EFLAGS: 00010046
[    2.988568] RAX: 000000000000ef00 RBX: ffff880000000058 RCX: ffffffff8142f872
[    2.988568] RDX: 000000000000ef00 RSI: 0000000000000000 RDI: ffff880000000058
[    2.988568] RBP: ffff880000000028 R08: ffff880000067f48 R09: ffffffff81d6c72a
[    2.988568] R10: ffffffff81d6d07b R11: ffff880000067f40 R12: 0000000000000000
[    2.988568] R13: 0000000000000000 R14: ffffffff81dcbdb0 R15: ffffffff81dcbdb0
[    2.988568] FS:  0000000000000000(0000) GS:ffff88000dc00000(0000) knlGS:0000000000000000
[    2.988568] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[    2.988568] CR2: ffff87fffffffff8 CR3: 00000000069c5000 CR4: 00000000000006e0
[    2.988568] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[    2.988568] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[    2.988568] Process init (pid: 1, threadinfo ffff880000066000, task ffff880000068000)
[    2.988568] Stack:
[    2.988568]  ffff880000000048 ffffffff81433a10 0000000000000001 0000000000000000
[    2.988568]  ffff880000000108 ffffffff8142fae5 ffffffff81dcbdb0 ffffffff81dcbdb0
[    2.988568]  0000000000000000 0000000000000000 ffff880000000108 ffff880000000138
[    3.010313] Call Trace:
[    3.010313] Code: 00 83 b8 44 e0 ff ff 01 0f 9f c0 e9 9d fe ff ff 0f 1f 84 00 00 00 00 00 55 48 89 e5 e8 d7 7a 3e 00 48 c7 c2 00 ef 00 00 48 89 d0 <65> 48 03 04 25 40 ec 00 00 8b 78 40 31 c9 85 ff 0f 95 c1 48 63 
[    3.010313] RIP  [<ffffffff81052e33>] kvm_read_and_reset_pf_reason+0x13/0x60
[    3.010313]  RSP <ffff880000000028>

Thanks,
Fengguang

View attachment "dmesg-kvm-xgwo-17468-2012-09-10-08-38-25-3.6.0-rc3-00182-gc2865bb-44" of type "text/plain" (68603 bytes)

View attachment "config-3.6.0-rc3-00182-gc2865bb" of type "text/plain" (57803 bytes)