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Re: [Xen-devel] PaX Security w/ Kernel.org DomU 2.6.31.7

  • To: Ian Campbell <Ian.Campbell@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: Andrew Lyon <andrew.lyon@xxxxxxxxx>
  • Date: Tue, 5 Jan 2010 01:48:47 -0800
  • Cc:
  • Delivery-date: Tue, 05 Jan 2010 01:49:15 -0800
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  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
On Tue, Jan 5, 2010 at 1:24 AM, Andrew Lyon <andrew.lyon@xxxxxxxxx> wrote:
> On Tue, Jan 5, 2010 at 1:15 AM, Andrew Lyon <andrew.lyon@xxxxxxxxx> wrote:
>> On Mon, Jan 4, 2010 at 12:18 PM, Andrew Lyon <andrew.lyon@xxxxxxxxx> wrote:
>>> On Mon, Jan 4, 2010 at 7:47 PM, Ian Campbell <Ian.Campbell@xxxxxxxxxx> 
>>> wrote:
>>>> On Mon, 2010-01-04 at 19:13 +0000, Andrew Lyon wrote:
>>>>> Daft question, how can I check if the Xen I am running was build with
>>>>> debug=y or not?
>>>>
>>>> Not daft at all, I've got no idea... I think it is printed as part of
>>>> Xen's oops messages but that's not terribly useful if you haven't got
>>>> one.
>>>>
>>>> Aha, Xen's "d" debug key includes debug=<y|n> in its output. Not
>>>> terribly elegant but it works...
>>>>
>>>> Ian.
>>>>
>>>>
>>>
>>> Thanks Ian, indeed it does show if Xen was built with debug,
>>> unfortunately it also crashed the entire system, and although there
>>> was a message "Reboot in 5 seconds" it did not reboot :(, I will see
>>> if I can replicate this but I believe I tested all of the Xen debug
>>> keys recently as I discovered that dumping dom0 registers triggered
>>> the watchdog and submitted a patch to fix that.
>>>
>>> Running Xen 3.4.2, here is the log
>>> d
>>> (XEN) 'd' pressed -> dumping registers
>>> (XEN)
>>> (XEN) *** Dumping CPU5 host state: ***
>>> (XEN) ----[ Xen-3.4.2  x86_64  debug=y  Not tainted ]----
>>> (XEN) CPU:    5
>>> (XEN) RIP:    e008:[<ffff828c8010e0f0>] __dump_execstate+0x9/0x78
>>> (XEN) RFLAGS: 0000000000010292   CONTEXT: hypervisor
>>> (XEN) rax: 0000000000000000   rbx: 0000000000000064   rcx: 0000000000000000
>>> (XEN) rdx: 0000000000000000   rsi: 000000000000000a   rdi: 0000000000000000
>>> (XEN) rbp: ffff83043ff97c48   rsp: ffff83043ff97c38   r8:  0000000000000004
>>> (XEN) r9:  0000000000000004   r10: 00000000fffffffc   r11: 0000000000000001
>>> (XEN) r12: ffff83043ff97dd8   r13: ffff828c80203b78   r14: 0000000000000282
>>> (XEN) r15: ffff83043ff97dd8   cr0: 000000008005003b   cr4: 00000000000026f0
>>> (XEN) cr3: 00000000bfc6c000   cr2: 00007f5cf492d8d0
>>> (XEN) ds: 002b   es: 002b   fs: 0000   gs: 0000   ss: e010   cs: e008
>>> (XEN) Xen stack trace from rsp=ffff83043ff97c38:
>>> (XEN)    ffff83043ff97dd8 0000000000000064 ffff83043ff97c88 ffff828c8010e1bc
>>> (XEN)    ffff83043ff97c78 0000000000000064 ffff83043ff97dd8 ffff828c80203b78
>>> (XEN)    0000000000000282 ffff83043ff97dd8 ffff83043ff97ca8 ffff828c8010e34b
>>> (XEN)    ffff83043ff97dd8 0000000000000064 ffff83043ff97cb8 ffff828c80127d98
>>> (XEN)    ffff83043ff97cd8 ffff828c80127e65 ffff828c80203b00 ffff828c80127ddc
>>> (XEN)    ffff83043ff97d28 ffff828c8012924e ffff83043ff97cf8 ffff828c8012859d
>>> (XEN)    64ff83043ff97d28 0000000000000061 ffff828c80284340 ffff828c80203b00
>>> (XEN)    ffff83043ff97dd8 ffff828c80284368 ffff83043ff97d58 ffff828c8012885c
>>> (XEN)    ffff828c80294f80 ffff83043ff97dd8 ffff83043ff97f28 ffff828c8027e900
>>> (XEN)    ffff83043ff97dc8 ffff828c80148d99 00000000000000f1 0000000000000005
>>> (XEN)    0000000000000006 ffff828c80294fa4 000000f18011cb8e 0000000000000005
>>> (XEN)    0000000000000000 000000000072f524 000000000072ef9d ffff83042e1d35f0
>>> (XEN)    ffff83042e1d3590 ffff828c8021a760 00007cfbc0068207 ffff828c801423b6
>>> (XEN)    ffff828c8021a760 ffff83042e1d3590 ffff83042e1d35f0 000000000072ef9d
>>> (XEN)    ffff83043ff97ed0 000000000072f524 000052b9b64e72e4 ffff830093724060
>>> (XEN)    0000000000000006 0000000000000004 000000000072f524 0000000000000001
>>> (XEN)    0000000000001008 0000000000000001 0000000000000000 000000f100000000
>>> (XEN)    ffff828c801791df 000000000000e008 0000000000000283 ffff83043ff97e80
>>> (XEN)    000000000000e010 ffff828c8027e900 ffff828c8027f900 ffff83043ff97ed0
>>> (XEN)    000000008011af48 ffffffffffffffff ffff83043ff97f28 ffff83043ff97f28
>>> (XEN) Xen call trace:
>>> (XEN)    [<ffff828c8010e0f0>] __dump_execstate+0x9/0x78
>>> (XEN)    [<ffff828c8010e1bc>] dump_registers+0x5d/0x135
>>> (XEN)    [<ffff828c8010e34b>] handle_keypress+0x76/0x9b
>>> (XEN)    [<ffff828c80127d98>] __serial_rx+0x16/0x5a
>>> (XEN)    [<ffff828c80127e65>] serial_rx+0x89/0x8e
>>> (XEN)    [<ffff828c8012924e>] serial_rx_interrupt+0xa9/0xbf
>>> (XEN)    [<ffff828c8012885c>] ns16550_interrupt+0x47/0x61
>>> (XEN)    [<ffff828c80148d99>] do_IRQ+0x3e7/0x42e
>>> (XEN)    [<ffff828c801423b6>] common_interrupt+0x26/0x30
>>> (XEN)    [<ffff828c801791df>] acpi_processor_idle+0x1fe/0x42f
>>> (XEN)    [<ffff828c8013e7db>] idle_loop+0xbe/0xc5
>>> (XEN)
>>> (XEN) *** Dumping CPU5 guest state: ***
>>> (XEN) No guest context (CPU is idle).
>>> (XEN)
>>> (XEN) *** Dumping CPU0 host state: ***
>>> (XEN) ----[ Xen-3.4.2  x86_64  debug=y  Not tainted ]----
>>> (XEN) CPU:    0
>>> (XEN) RIP:    e008:[<ffff828c8010e0f0>] __dump_execstate+0x9/0x78
>>> (XEN) RFLAGS: 0000000000010092   CONTEXT: hypervisor
>>> (XEN) rax: ffff83043ff97bf8   rbx: 0000000000a13d97   rcx: 0000000000000001
>>> (XEN) rdx: ffff828c8027e900   rsi: ffff83043ff97bf8   rdi: 0000000000000000
>>> (XEN) rbp: ffff828c80267db8   rsp: ffff828c80267da8   r8:  ffff828c8010e0e7
>>> (XEN) r9:  0000000000000006   r10: ffff828c8023c560   r11: 000052b9d8788566
>>> (XEN) r12: 0000000000a13779   r13: ffff83042e1d8210   r14: ffff83042e1d81b0
>>> (XEN) r15: ffff828c8021a760   cr0: 000000008005003b   cr4: 00000000000026f0
>>> (XEN) cr3: 0000000080804000   cr2: 00007f9695f32315
>>> (XEN) ds: 0000   es: 0000   fs: 0000   gs: 0000   ss: e010   cs: e008
>>> (XEN) Xen stack trace from rsp=ffff828c80267da8:
>>> (XEN)    00000000000000ff 0000000000a13d97 ffff828c80267dc8 ffff828c8015942c
>>> (XEN)    00007d737fd98207 ffff828c80143470 ffff828c8021a760 ffff83042e1d81b0
>>> (XEN)    ffff83042e1d8210 0000000000a13779 ffff828c80267ed0 0000000000a13d97
>>> (XEN)    000052b9d8788566 ffff828c8023c560 0000000000000006 0000000000000004
>>> (XEN)    0000000000a13d97 0000000000000001 0000000000001008 0000000000000001
>>> (XEN)    0000000000000000 000000fb00000000 ffff828c801791df 000000000000e008
>>> (XEN)    0000000000000287 ffff828c80267e80 000000000000e010 ffff828c8027e900
>>> (XEN)    ffff828c8027f900 ffff828c80267ed0 000000008011af48 ffffffffffffffff
>>> (XEN)    ffff828c80267f28 ffff828c80267f28 ffff828c8027ad80 ffff828c8027e900
>>> (XEN)    ffff828c8021a760 ffff828c80267f20 ffff828c8013e7db ffff828c8011af79
>>> (XEN)    ffff828c80267f28 ffff828c8023c5b0 ffff8300bfafc000 0000000000000000
>>> (XEN)    ffff8300beb62000 000052b9d6ab2f39 ffff828c8023c100 ffff828c80267dc8
>>> (XEN)    0000000000000000 ffffffff808500d0 ffffffff8084f6d0 ffffffffffffffff
>>> (XEN)    0000000000000000 0000000000000000 0000000000000246 ffff88005ce1d938
>>> (XEN)    ffff88007f5bc108 0000000000000000 0000000000000000 ffffffff802063aa
>>> (XEN)    00000000deadbeef 00000000deadbeef 00000000deadbeef 0000010000000000
>>> (XEN)    ffffffff802063aa 000000000000e033 0000000000000246 ffffffff80781f30
>>> (XEN)    000000000000e02b 000000000000beef 000000000000beef 000000000000beef
>>> (XEN)    000000000000beef 0000000000000000 ffff8300bfafc000
>>> (XEN) Xen call trace:
>>> (XEN)    [<ffff828c8010e0f0>] __dump_execstate+0x9/0x78
>>> (XEN)    [<ffff828c8015942c>] smp_call_function_interrupt+0x99/0xe8
>>> (XEN)    [<ffff828c80143470>] call_function_interrupt+0x30/0x40
>>> (XEN)    [<ffff828c801791df>] acpi_processor_idle+0x1fe/0x42f
>>> (XEN)    [<ffff828c8013e7db>] idle_loop+0xbe/0xc5
>>> (XEN)
>>> (XEN) *** Dumping CPU0 guest state: ***
>>> (XEN) No guest context (CPU is idle).
>>> (XEN)
>>> (XEN) *** Dumping CPU1 host state: ***
>>> (XEN) ----[ Xen-3.4.2  x86_64  debug=y  Not tainted ]----
>>> (XEN) CPU:    1
>>> (XEN) RIP:    e008:[<ffff828c8010e0f0>] __dump_execstate+0x9/0x78
>>> (XEN) RFLAGS: 0000000000010092   CONTEXT: hypervisor
>>> (XEN) rax: ffff83043ff97bf8   rbx: 0000000000c881c7   rcx: 0000000000000001
>>> (XEN) rdx: ffff828c8027e900   rsi: ffff83043ff97bf8   rdi: 0000000000000000
>>> (XEN) rbp: ffff83043ffd7db8   rsp: ffff83043ffd7da8   r8:  ffff828c8010e0e7
>>> (XEN) r9:  0000000000000003   r10: ffff83040ef14a88   r11: 000052ba2e8e2eda
>>> (XEN) r12: 0000000000c843b5   r13: ffff83042e1d8660   r14: ffff83042e1d8600
>>> (XEN) r15: ffff828c8021a760   cr0: 000000008005003b   cr4: 00000000000026f0
>>> (XEN) cr3: 000000022394c000   cr2: 00007f9695f32315
>>> (XEN) ds: 002b   es: 002b   fs: 0000   gs: 0000   ss: e010   cs: e008
>>> (XEN) Xen stack trace from rsp=ffff83043ffd7da8:
>>> (XEN)    0000000000c8437d 0000000000c881c7 ffff83043ffd7dc8 ffff828c8015942c
>>> (XEN)    00007cfbc0028207 ffff828c80143470 ffff828c8021a760 ffff83042e1d8600
>>> (XEN)    ffff83042e1d8660 0000000000c843b5 ffff83043ffd7ed0 0000000000c881c7
>>> (XEN)    000052ba2e8e2eda ffff83040ef14a88 0000000000000003 0000000000000004
>>> (XEN)    0000000000c881c7 0000000000000001 0000000000001008 0000000000000001
>>> (XEN)    0000000000000000 000000fb00000000 ffff828c801791df 000000000000e008
>>> (XEN)    0000000000000297 ffff83043ffd7e80 000000000000e010 ffff828c8027e900
>>> (XEN)    ffff828c8027f900 ffff83043ffd7ed0 000000018011af48 ffffffffffffffff
>>> (XEN)    ffff83043ffd7f28 ffff83043ffd7f28 ffff828c8027ad80 ffff828c8027e900
>>> (XEN)    ffff828c8021a760 ffff83043ffd7f20 ffff828c8013e7db ffff828c8011af79
>>> (XEN)    ffff83043ffd7f28 ffff828c8023c5b0 ffff8300bff40000 0000000000000001
>>> (XEN)    ffff8300beb60000 000052b9fb24146d ffff828c8023d100 ffff83043ffd7dc8
>>> (XEN)    0000000000000000 0000000000000000 0000000000000000 0000000000000000
>>> (XEN)    0000000000000000 0000000000000001 0000000000000246 0000979700000000
>>> (XEN)    0000000000000000 ffff8803e98c9ea0 0000000000000000 ffffffff802063aa
>>> (XEN)    00000000deadbeef 00000000deadbeef 00000000deadbeef 0000010000000000
>>> (XEN)    ffffffff802063aa 000000000000e033 0000000000000246 ffff8803e98c9ed8
>>> (XEN)    000000000000e02b 000000000000beef 000000000000beef 000000000000beef
>>> (XEN)    000000000000beef 0000000000000001 ffff8300bff40000
>>> (XEN) Xen call trace:
>>> (XEN)    [<ffff828c8010e0f0>] __dump_execstate+0x9/0x78
>>> (XEN)    [<ffff828c8015942c>] smp_call_function_interrupt+0x99/0xe8
>>> (XEN)    [<ffff828c80143470>] call_function_interrupt+0x30/0x40
>>> (XEN)    [<ffff828c801791df>] acpi_processor_idle+0x1fe/0x42f
>>> (XEN)    [<ffff828c8013e7db>] idle_loop+0xbe/0xc5
>>> (XEN)
>>> (XEN) *** Dumping CPU1 guest state: ***
>>> (XEN) No guest context (CPU is idle).
>>> (XEN)
>>> (XEN) *** Dumping CPU2 host state: ***
>>> (XEN) ----[ Xen-3.4.2  x86_64  debug=y  Not tainted ]----
>>> (XEN) CPU:    2
>>> (XEN) RIP:    e008:[<ffff828c8010e0f0>] __dump_execstate+0x9/0x78
>>> (XEN) RFLAGS: 0000000000010092   CONTEXT: hypervisor
>>> (XEN) rax: ffff83043ff97bf8   rbx: 0000000000efc5ce   rcx: 0000000000000001
>>> (XEN) rdx: ffff828c8027e900   rsi: ffff83043ff97bf8   rdi: 0000000000000000
>>> (XEN) rbp: ffff83043ffc7db8   rsp: ffff83043ffc7da8   r8:  ffff828c8010e0e7
>>> (XEN) r9:  0000000000000004   r10: ffff83041a9bc718   r11: 000052ba2cce99f9
>>> (XEN) r12: 0000000000efa19d   r13: ffff83042e1d8ab0   r14: ffff83042e1d8a50
>>> (XEN) r15: ffff828c8021a760   cr0: 000000008005003b   cr4: 00000000000026f0
>>> (XEN) cr3: 0000000080804000   cr2: 00000000119e3000
>>> (XEN) ds: 002b   es: 002b   fs: 0000   gs: 0000   ss: e010   cs: e008
>>> (XEN) Xen stack trace from rsp=ffff83043ffc7da8:
>>> (XEN)    0000000000000282 0000000000efc5ce ffff83043ffc7dc8 ffff828c8015942c
>>> (XEN)    00007cfbc0038207 ffff828c80143470 ffff828c8021a760 ffff83042e1d8a50
>>> (XEN)    ffff83042e1d8ab0 0000000000efa19d ffff83043ffc7ed0 0000000000efc5ce
>>> (XEN)    000052ba2cce99f9 ffff83041a9bc718 0000000000000004 0000000000000004
>>> (XEN)    0000000000efc5ce 0000000000000001 0000000000001008 0000000000000001
>>> (XEN)    0000000000000000 000000fb00000000 ffff828c801791df 000000000000e008
>>> (XEN)    0000000000000297 ffff83043ffc7e80 000000000000e010 ffffffffffffffff
>>> (XEN)    ffff83043ffc7ed8 ffff828c8011d137 00000001bfafa000 ffffffffffffffff
>>> (XEN)    ffff83043ffc7f28 ffff83043ffc7f28 ffff828c8027ad80 ffff828c8027e900
>>> (XEN)    ffff828c8021a760 ffff83043ffc7f20 ffff828c8013e7db ffff828c8011af79
>>> (XEN)    ffff83043ffc7f28 ffff828c8023c5b0 ffff8300bfafa000 0000000000000002
>>> (XEN)    ffff8300bfaf6000 000052ba2c40dc61 ffff828c8023e100 ffff83043ffc7dc8
>>> (XEN)    0000000000000000 0000000000000000 0000000000000000 0000000000000000
>>> (XEN)    0000000000000000 0000000000000002 0000000000000246 ffff8803e99afcf0
>>> (XEN)    ffff8803e99ad988 0000000000000000 0000000000000000 ffffffff802063aa
>>> (XEN)    00000000deadbeef 00000000deadbeef 00000000deadbeef 0000010000000000
>>> (XEN)    ffffffff802063aa 000000000000e033 0000000000000246 ffff8803e98cbed8
>>> (XEN)    000000000000e02b 000000000000beef 000000000000beef 000000000000beef
>>> (XEN)    000000000000beef 0000000000000002 ffff8300bfafa000
>>> (XEN) Xen call trace:
>>> (XEN)    [<ffff828c8010e0f0>] __dump_execstate+0x9/0x78
>>> (XEN)    [<ffff828c8015942c>] smp_call_function_interrupt+0x99/0xe8
>>> (XEN)    [<ffff828c80143470>] call_function_interrupt+0x30/0x40
>>> (XEN)    [<ffff828c801791df>] acpi_processor_idle+0x1fe/0x42f
>>> (XEN)    [<ffff828c8013e7db>] idle_loop+0xbe/0xc5
>>> (XEN)
>>> (XEN) *** Dumping CPU2 guest state: ***
>>> (XEN) No guest context (CPU is idle).
>>> (XEN)
>>> (XEN) *** Dumping CPU3 host state: ***
>>> (XEN) ----[ Xen-3.4.2  x86_64  debug=y  Not tainted ]----
>>> (XEN) CPU:    3
>>> (XEN) RIP:    e008:[<ffff828c8010e0f0>] __dump_execstate+0x9/0x78
>>> (XEN) RFLAGS: 0000000000010092   CONTEXT: hypervisor
>>> (XEN) rax: ffff83043ff97bf8   rbx: 0000000000000003   rcx: 0000000000000001
>>> (XEN) rdx: ffff828c8027e900   rsi: ffff83043ff97bf8   rdi: 0000000000000000
>>> (XEN) rbp: ffff83043ffb7dd8   rsp: ffff83043ffb7dc8   r8:  ffff828c8010e0e7
>>> (XEN) r9:  0000000000000004   r10: ffff8300beb456d8   r11: 000052ba60111156
>>> (XEN) r12: ffff83043ffb7f28   r13: ffff83043ffb7f28   r14: ffff828c8027e900
>>> (XEN) r15: ffff828c8027f900   cr0: 000000008005003b   cr4: 00000000000026f0
>>> (XEN) cr3: 000000008b7db000   cr2: 000000000333cd38
>>> (XEN) ds: 002b   es: 002b   fs: 0000   gs: 0000   ss: e010   cs: e008
>>> (XEN) Xen stack trace from rsp=ffff83043ffb7dc8:
>>> (XEN)    ffff828c801075a7 0000000000000003 ffff83043ffb7de8 ffff828c8015942c
>>> (XEN)    00007cfbc00481e7 ffff828c80143470 ffff828c8027f900 ffff828c8027e900
>>> (XEN)    ffff83043ffb7f28 ffff83043ffb7f28 ffff83043ffb7ed0 0000000000000003
>>> (XEN)    000052ba60111156 ffff8300beb456d8 0000000000000004 0000000000000002
>>> (XEN)    ffff828c8027ea80 0000000000000001 0000000000000001 ffff828c8023f5c0
>>> (XEN)    0000000000003fff828c8011b157>] _spin_unlock_irqrestore+0xc/0x24
>>> (XEN) RFLAGS: 0000000000010002   CONTEXT: hypervisor
>>> (XEN) rax: 0000000000000001   rbx: 0000000000000000   rcx: 0000000000000020
>>> (XEN) rdx: 00000000000003f8   rsi: 0000000000000082   rdi: ffff828c80203b80
>>> (XEN) rbp: ffff83043ff90b48   rsp: ffff83043ff90b48   r8:  0000000000000004
>>> (XEN) r9:  0000000000000004   r10: 00000000fffffffc   r11: 0000000000000001
>>> (XEN) r12: ffff828c801ec9cb   r13: ffff828c80203b00   r14: 0000000000000000
>>> (XEN) r15: 0000000000000000   cr0: 000000008005003b   cr4: 00000000000026f0
>>> (XEN) cr3: 00000000bfc6c000   cr2: 00007f5cf492d8d0
>>> (XEN) ds: 002b   es: 002b   fs: 0000   gs: 0000   ss: e010   cs: e008
>>> (XEN) Xen stack trace from rsp=ffff83043ff90b48:
>>> (XEN)    ffff83043ff90b98 ffff828c801290c4 000000083ff90b88 ffff828c80203b80
>>> (XEN)    0000000000000082 ffff828c801ec9c5 ffff83043ff90c70 0000000000000082
>>> (XEN)    ffff83043ff90f58 0000000000000001 ffff83043ff90ba8 ffff828c801276ea
>>> (XEN)    ffff83043ff90bc8 ffff828c8012771f ffff83043ff90bd8 0000000000000000
>>> (XEN)    ffff83043ff90c58 ffff828c80127776 ffff83043ff90c28 ffff828c801290c4
>>> (XEN)    000000083ff90c58 ffff828c80203b80 0000000000000082 ffff828c801f3523
>>> (XEN)    ffff83043ff90c70 0000000000000082 ffff83043ff90f58 0000000000000001
>>> (XEN)    ffff83043ff90c38 ffff828c801276ea ffff83043ff90c58 ffff828c80127728
>>> (XEN)    ffff83043ff90f58 0000000000000000 ffff83043ff90d68 ffff828c80127cae
>>> (XEN)    0000000000000079 ffff828c8027fe8a 0000003000000010 ffff83043ff90d78
>>> (XEN)    ffff83043ff90c98 0000000000000000 0000000000000000 0000000000000005
>>> (XEN)    0000000000000000 0000000000000000 0000000000000004 0000000000000004
>>> (XEN)    ffff83043ff90ce8 0000000000000020 ffff828c801ec9cb 0000000000000086
>>> (XEN)    ffff83043ff90d38 ffff828c801290c4 ffff83043ff90d18 0000000000000004
>>> (XEN)    ffff83043ff90d28 ffff828c801e92a9 ffff83043ff90d68 ffff828c801d55e5
>>> (XEN)    6e69617420746f4e 0000000000646574 ffff83043ff90d48 ffff828c801285bb
>>> (XEN)    ffff83043ff90d78 ffff83043ff97f28 0000000000000001290c4
>>> (XEN)    000000008005003b ffff828c80203b80 00007f5cf492d8d0 00000000bfc6c000
>>> (XEN)    00000000000026f0 0000000000000082 ffff828c8010e0e7 0000000000000001
>>> (XEN) Xen call trace:
>>> (XEN)    [<ffff828c8011b157>] _spin_unlock_irqrestore+0xc/0x24
>>> (XEN)    [<ffff828c801290c4>] serial_puts+0xea/0xf9
>>> (XEN)    [<ffff828c801276ea>] sercon_puts+0x25/0x27
>>> (XEN)    [<ffff828c8012771f>] __putstr+0x33/0x75
>>> (XEN)    [<ffff828c80127776>] printk_start_of_line+0x15/0x81
>>> (XEN)    [<ffff828c80127cae>] printk+0x19c/0x1cf
>>> (XEN)    [<ffff828c801d59ec>] show_registers+0x29e/0x374
>>> (XEN)    [<ffff828c8015f4d4>] show_execution_state+0x11/0x20
>>> (XEN)    [<ffff828c8015fdeb>] fatal_trap+0x5d/0xd6
>>> (XEN)    [<ffff828c80156d74>] nmi_watchdog_tick+0xc4/0x1b4
>>> (XEN)    [<ffff828c8015ffa9>] do_nmi+0x5d/0xf9
>>> (XEN)    [<ffff828c801d2943>] handle_ist_exception+0x58/0x65
>>> (XEN)    [<ffff828c801595e6>] on_selected_cpus+0x10a/0x12f
>>> (XEN)    [<ffff828c8010e24a>] dump_registers+0xeb/0x135
>>> (XEN)    [<ffff828c8010e34b>] handle_keypress+0x76/0x9b
>>> (XEN)    [<ffff828c80127d98>] __serial_rx+0x16/0x5a
>>> (XEN)    [<ffff828c80127e65>] serial_rx+0x89/0x8e
>>> (XEN)    [<ffff828c8012924e>] serial_rx_interrupt+0xa9/0xbf
>>> (XEN)    [<ffff828c8012885c>] ns16550_interrupt+0x47/0x61
>>> (XEN)    [<ffff828c80148d99>] do_IRQ+0x3e7/0x42e
>>> (XEN)    [<ffff828c801423b6>] common_interrupt+0x26/0x30
>>> (XEN)    [<ffff828c801791df>] acpi_processor_idle+0x1fe/0x42f
>>> (XEN)    [<ffff828c8013e7db>] idle_loop+0xbe/0xc5
>>> (XEN)
>>> (XEN)
>>> (XEN) ****************************************
>>> (XEN) Panic on CPU 5:
>>> (XEN) Assertion '((lock)->lock <= 0)' failed at
>>> /var/tmp/portage/app-emulation/xen-3.4.2/work/xen-:18
>>> (XEN) ****************************************
>>> (XEN)
>>> (XEN) Reboot in five seconds...
>>>
>>>
>>> Andy
>>>
>>
>> I tried 'd' again on the same supermicro system and triggered a
>> similar crash and lockup, I then tried it on my optiplex test system
>> which had a debug=n Xen and it did not crash, however after
>> recompiling Xen on the Optiplex with debug=y 'd' triggers the
>> watchdog, so perhaps the problem is similar to the one I found
>> recently where dumping dom0 registers trigged the watchdog.
>>
>> Both systems were dead locked after the crash, they did not reboot
>> automatically.
>>
>> The supermicro has a 38400 baud physical serial port, the Optiplex has
>> a intel amt virtual serial port.
>>
>> I will try adding a watchdog disable/enable around the dump registers
>> and test again on both systems, I will also test if the supermicro
>> system crashes when running a non debug Xen, perhaps this only happens
>> with debug builds.
>>
>> Logs attached.
>>
>> Andy
>>
>
> Ian,
>
> Sorry, I've got a head full of cold and got completely confused
> between dump_registers and dump_dom0_registers, I've already submited
> a patch to fix the 'd' problem and it was merged!
>
> Andy
> ,
>

The patch I submitted recently to disable watchdog around
dump_registers fixes the crash on both systems, I believe the Optiplex
was only affected when running a debug kernel because that increased
the amount of output from 'd', where the supermicro had so many cpu's
that regardless of debug build or not the serial console could not
keep up and the watchdog was triggered.

I've created my own ebuilds for 3.4.2 which include this fix and will
try to get the Gentoo maintainer to include them too, I ended up
running without my fix applied because I had upgraded gcc and
recompiled Xen using the in-portage build.

Andy

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