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Re: [Xen-devel] 3.1/2 live migration panic

On Wed, Jan 16, 2008 at 09:43:41PM +0000, Keir Fraser wrote:

> If you have a debug build of Xen then the backtrace should be trustworthy.
> Are there addresses in the backtrace that don't look to be within Xen text?

Here's what I got without the panic patch (sigh):

(XEN) sh error: sh_page_fault__shadow_4_guest_4(): Recursive shadow fault: lock 
was taken by sh_page_fault__shadow_4_guest_4
(XEN) ----[ Xen-3.1.2  x86_64  debug=n  Not tainted ]----
(XEN) CPU:    3
(XEN) RIP:    e008:[<ffff828c80168822>] shadow_set_l1e+0x32/0x1b0
(XEN) RFLAGS: 0000000000010282   CONTEXT: hypervisor
(XEN) rax: 0000000000000000   rbx: 800000012521c067   rcx: 0000000000132b04
(XEN) rdx: 800000012521c067   rsi: 00000000000000b1   rdi: ffff8300e2ed2080
(XEN) rbp: ffff8300e2e0fc08   rsp: ffff8300e2e0fbc8   r8:  0000000000000006
(XEN) r9:  0000000000000006   r10: 0000000132b05118   r11: 0000000132b07ff0
(XEN) r12: ffff8300e2ed2080   r13: 00000000000000b1   r14: 0000000000132b04
(XEN) r15: 0000000000000001   cr0: 000000008005003b   cr4: 00000000000006f0
(XEN) cr3: 0000000132b07000   cr2: 00000000000000b1
(XEN) ds: 004b   es: 004b   fs: 0000   gs: 01c3   ss: 0000   cs: e008
(XEN) Xen stack trace from rsp=ffff8300e2e0fbc8:
(XEN)    ffff8300e2e0fc08 0000000080167b02 800000012521c067
(XEN)    ffff8300e2e0ff28 ffff8300e2ed2080 ffff8300e2fb6080
(XEN)    ffff828c80221b20 0000000000000001 ffff8300e2e0fe18
(XEN)    ffff828c8016af61 0000000000000000 ffffff0003fd3ac0
(XEN)    0000000000000000 ffff828c80221b20 ffff8300e2e0fd98
(XEN)    ffff828c8010d757 ffff830184aeb000 0000000000000008
(XEN)    ffff8300e2fb6080 ffff828c801c52b8 0000000000132b07
(XEN)    ffff81c0ffc00118 00000000000000b1 ffff8300e2e0fcf0
(XEN)    0000000000000008 000000000012521c 00000006e2e0fd68
(XEN)    ffff8300e2e0fe78 ffffff000475d848 ffff8300e2e06080
(XEN)    ffff8300e2e0fcf8 800000012521c067 0000000132b04067
(XEN)    0000000132b05067 0000000132b06067 0000000000132b06
(XEN)    0000000000132b05 0000000000132b04 ffff8300e2e0fd18
(XEN)    0000000000000082 0000000000003000 ffff8300e2e06080
(XEN)    ffff8300e2e0fd28 ffff828c801355b2 ffff8300e2e0fe78
(XEN)    ffff828c801288db ffff828c801c8100 0000005878a902d7
(XEN)    ffff8300e2ed2080 ffff8300e2e06080 0000000000000086
(XEN)    0000000000003000 ffff8300e2e0ff28 ffff8300e2e06080
(XEN)    ffff8300e2ed2080 ffff8300e2e0fdc0 ffff828c801252d7
(XEN)    820000000000efff ffffff000475d848 ffff8140a0502ff0
(XEN) Xen call trace:
(XEN)    [<ffff828c80168822>] shadow_set_l1e+0x32/0x1b0
(XEN)    [<ffff828c8016af61>] sh_page_fault__shadow_4_guest_4+0xb61/0x10b0
(XEN)    [<ffff828c8013b1c2>] do_page_fault+0x1f2/0x500
(XEN)    [<ffff828c8017a495>] handle_exception_saved+0x2d/0x6b
(XEN) Pagetable walk from 00000000000000b1:
(XEN)  L4[0x000] = 0000000000000000 ffffffffffffffff
(XEN) ****************************************
(XEN) Panic on CPU 3:
(XEN) [error_code=0000]
(XEN) Faulting linear address: 00000000000000b1
(XEN) ****************************************
(XEN) Reboot in five seconds...

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