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

from [Andrew Lyon] [Permanent Link][Original]
To: Ian Campbell <Ian.Campbell@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] PaX Security w/ Kernel.org DomU 2.6.31.7
From: Andrew Lyon <andrew.lyon@xxxxxxxxx>
Date: Tue, 5 Jan 2010 01:15:59 -0800
Cc:
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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

Attachment: optiplex_dump_registers_crash_debug_y
Description: Binary data

Attachment: supermicro_dump_registers_crash_debug_y
Description: Binary data

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