[Xen-devel] So I tried to use xentrace...

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

When I ran "xentrace -D -S 256 -e all /tmp/test.trace" from the
xenanalyze documentation, Xen immediately crashed with:

(XEN) tbuf_size 256
(XEN) p0 mfn 106a00 offset 64
(XEN) p1 mfn 115700 offset 320
(XEN) p2 mfn 113f00 offset 576
(XEN) p3 mfn 113e00 offset 832
(XEN) Xen trace buffers: initialized
(XEN) ----[ Xen-4.1-unstable  x86_64  debug=y  Not tainted ]----
(XEN) CPU:    1
(XEN) RIP:    e008:[<ffff82c4801215b3>] check_lock+0x1b/0x45
(XEN) RFLAGS: 0000000000010246   CONTEXT: hypervisor
(XEN) rax: 0000000000000001   rbx: 0000000000000028   rcx: 0000000000000000
(XEN) rdx: 0000000000000000   rsi: 00000000c3fc8050   rdi: 000000000000002c
(XEN) rbp: ffff83013ff2fc60   rsp: ffff83013ff2fc60   r8:  ffff8300bf78a000
(XEN) r9:  ffff83013ff60000   r10: 0080000000000001   r11: ffff82f60164b930
(XEN) r12: 00000000c3fc8050   r13: 00000000c3fc8050   r14: 0000000000000028
(XEN) r15: 0000000000800627   cr0: 000000008005003b   cr4: 00000000000026f0
(XEN) cr3: 00000000b2fa0000   cr2: 000000000000002c
(XEN) ds: 0000   es: 0000   fs: 0000   gs: 0000   ss: e010   cs: e008
(XEN) Xen stack trace from rsp=ffff83013ff2fc60:
(XEN)    ffff83013ff2fc78 ffff82c480121993 0000000000000000 ffff83013ff2fca8
(XEN)    ffff82c480117fe0 ffff83013fee0000 80000c3fc8050627 00000000c3fc8050
(XEN)    ffff83013ff60000 ffff83013ff2fd28 ffff82c48016538c ffff8800aec97b08
(XEN)    ffff83013ff2fcf0 00000000000b25c9 0000000000000100 ffff8300bf78a000
(XEN)    0000000000000206 0000000000000000 ffff830e7f900a00 ffff83013ff2fd28
(XEN)    ffff8300b25c9228 ffff8300bf78a000 0000000000800627 0000000000000000
(XEN)    0000000000000000 ffff83013ff2fdb8 ffff82c48016a9f7 ffff83013fee0018
(XEN)    00007ff03ff2ff28 0000000000000000 00000000000b25c9 ffff83013fee0000
(XEN)    80000c3fc8050627 80000c3fc8050627 ffff83013ff60000 ffff83013ff2fdb8
(XEN)    0000000180162c10 ffff83013ff2fdd8 0000000000000000 0000000000000000
(XEN)    ffff8800aec97bb8 ffff83013ff2ff28 ffff83013ff2ff28 ffff83013ff2ff08
(XEN)    ffff82c48016b2a9 0000000000000000 0000000000000000 0000000000000000
(XEN)    00000000bf78a000 0000000000000006 00000000b2e55067 ffff83013ff2ff28
(XEN)    ffff83013ff2ff28 ffff83013ff2ff28 ffff83013ff2ff28 ffff83013ff2ff28
(XEN)    ffff83013ff2ff28 ffff83013ff2ff28 ffff83013ff2ff28 0000000000000000
(XEN)    00007ff200000082 ffff83013ff2fe68 80000c3fc8050627 ffff8300bf78a000
(XEN)    ffff8300b25c9228 ffff83013ff2fee8 ffff82f60164b920 ffff83013fee0000
(XEN)    000000000003e6b8 00000000000b25c9 00000001032cc060 ffff83013ff60000
(XEN)    0000000000000000 aaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaa 00000001aaaaaaaa
(XEN)    0000000000000001 00000000b25c9228 80000c3fc8050627 ffff8800aec97bb8
(XEN) Xen call trace:
(XEN)    [<ffff82c4801215b3>] check_lock+0x1b/0x45
(XEN)    [<ffff82c480121993>] _spin_lock+0x11/0x3f
(XEN)    [<ffff82c480117fe0>] rangeset_contains_range+0x44/0x82
(XEN)    [<ffff82c48016538c>] get_page_from_l1e+0x24c/0x47f
(XEN)    [<ffff82c48016a9f7>] mod_l1_entry+0x47f/0x64e
(XEN)    [<ffff82c48016b2a9>] do_mmu_update+0x6e3/0x1962
(XEN)    [<ffff82c4801f71bf>] syscall_enter+0xef/0x149
(XEN)    
(XEN) Pagetable walk from 000000000000002c:
(XEN)  L4[0x000] = 00000000b2c3a067 00000000000aecc5
(XEN)  L3[0x000] = 00000000b2c70067 00000000000aec8f
(XEN)  L2[0x000] = 0000000000000000 ffffffffffffffff 
(XEN) 
(XEN) ****************************************
(XEN) Panic on CPU 1:
(XEN) FATAL PAGE FAULT
(XEN) [error_code=0000]
(XEN) Faulting linear address: 000000000000002c
(XEN) ****************************************
(XEN) 
(XEN) Reboot in five seconds...

        J


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