Re: [Xen-devel] Xen-unstable panic: FATAL PAGE FAULT

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

I'll have to decode the backtrace a bit, but I would guess most likely is
some memory got corrupted along the way, which would be rather nasty. I
already need to follow up on a report of apparent memory corruption in a
domU userspace (testing with the 'memtester' utility), so with a bit of luck
they could be maifestations of the same bug.

 -- Keir

On 06/02/2010 22:56, "Mark Hurenkamp" <mark.hurenkamp@xxxxxxxxx> wrote:

> Hi,
> 
> 
> While playing with my xen server (which is running xen-unstable/linux pvops),
> it suddenly crashed with the following messages on the serial port.
> This is a recent version of xen-unstable, but i am a few updates behind.
> I've seen this only once, so perhaps it is hard to reproduce. I hope this
> info is still of use to someone.
> 
> 
> Regards,
> Mark.
> 
> 
> (XEN) tmem: all pools frozen for all domains
> (XEN) tmem: all pools frozen for all domains
> (XEN) tmem: all pools thawed for all domains
> (XEN) tmem: all pools thawed for all domains
> (XEN) paging.c:170: paging_free_log_dirty_bitmap: used 19 pages for domain 3
> dirty logging
> (XEN) ----[ Xen-4.0.0-rc3-pre  x86_64  debug=y  Tainted:    C ]----
> (XEN) CPU:    2
> (XEN) RIP:    e008:[<ffff82c4801150c5>] free_heap_pages+0x53a/0x555
> (XEN) RFLAGS: 0000000000010282   CONTEXT: hypervisor
> (XEN) rax: ffff82c4803004c0   rbx: ffff82f600ae4b40   rcx: ffff8315ffffffe0
> (XEN) rdx: 00000000ffffffff   rsi: ffff8315ffffffe0   rdi: ffff82f600000000
> (XEN) rbp: ffff83013ff27bc8   rsp: ffff83013ff27b68   r8:  0000000000000000
> (XEN) r9:  0200000000000000   r10: 0000000000000001   r11: 0080000000000000
> (XEN) r12: ffff82f600ae4b60   r13: 0000000000000000   r14: 00007d0a00000000
> (XEN) r15: 0000000000000000   cr0: 000000008005003b   cr4: 00000000000026f0
> (XEN) cr3: 0000000101001000   cr2: ffff8315ffffffe4
> (XEN) ds: 0000   es: 0000   fs: 0000   gs: 0000   ss: e010   cs: e008
> (XEN) Xen stack trace from rsp=ffff83013ff27b68:
> (XEN)    c2c2c2c2c2c2c2c2 0000000000000064 0000000000000000 0000000000000012
> (XEN)    0000000000000297 000000000000017a ffff82c48011e1e3 0000000000000000
> (XEN)    ffff83010fc50000 ffff82f600ae4b60 0000000000069f65 ffff82f600ae4b80
> (XEN)    ffff83013ff27c18 ffff82c4801153ee 0000000000000001 0000000000000001
> (XEN)    ffff82f600ae49c8 ffff82f600ae4b60 0000000000800727 ffff83013fef0000
> (XEN)    ffff82f600ae4b60 ffff83010fc50000 ffff83013ff27c38 ffff82c48015d4d0
> (XEN)    000000000000e010 800000005725b727 ffff83013ff27c78 ffff82c48015f8d8
> (XEN)    80000000571bf727 ffff8300aae3ac60 ffff83013fef0000 ffff8300aae3b000
> (XEN)    ffff83013ff27f28 0000000000000000 ffff83013ff27cd8 ffff82c48015eaf4
> (XEN)    ffff83013ff27d08 ffff82c48015fe3d ffff83013ff27cf8 ffff82c48015d4fe
> (XEN)    ffff83013ff27cc8 1400000000000001 ffff82f60155c740 ffff82f60155c740
> (XEN)    ffff83013ff27f28 007fffffffffffff ffff83013ff27d28 ffff82c48015f11c
> (XEN)    000000003fef0000 ffff82f60155c750 ffff83013ff27d38 ffff83013fef0000
> (XEN)    0000000000000000 ffffc9000000c2b0 00000000000aae3a ffff83013ff27f28
> (XEN)    ffff83013ff27d38 ffff82c48015f2f8 ffff83013ff27e38 ffff82c480163a4f
> (XEN)    ffff83013fef0018 00007ff03fef0000 0000000000000000 ffff82c480264db0
> (XEN)    ffff82c480264db8 ffff83013ff27f28 ffff83013ff27f28 ffff83013fef0218
> (XEN)    ffff8300bf524000 ffff83013fef0000 ffff8300bf524000 ffff83013fef0000
> (XEN)    ffff83013fff3da8 0000000100000002 ffff830100000000 ffff82f60155c740
> (XEN)    800000008eadf063 ffff880000000001 ffff83013ff27de8 000000003fff3d90
> (XEN) Xen call trace:
> (XEN)    [<ffff82c4801150c5>] free_heap_pages+0x53a/0x555
> (XEN)    [<ffff82c4801153ee>] free_domheap_pages+0x30e/0x3cc
> (XEN)    [<ffff82c48015d4d0>] put_page+0x6c/0x73
> (XEN)    [<ffff82c48015f8d8>] put_page_from_l1e+0x19f/0x1b5
> (XEN)    [<ffff82c48015eaf4>] free_page_type+0x25c/0x7b0
> (XEN)    [<ffff82c48015f11c>] __put_page_type+0xd4/0x292
> (XEN)    [<ffff82c48015f2f8>] put_page_type+0xe/0x23
> (XEN)    [<ffff82c480163a4f>] do_mmuext_op+0x6ff/0x14b8
> (XEN)    [<ffff82c480114235>] do_multicall+0x285/0x410
> (XEN)    [<ffff82c4801f01bf>] syscall_enter+0xef/0x149
> (XEN)
> (XEN) Pagetable walk from ffff8315ffffffe4:
> (XEN)  L4[0x106] = 00000000bf4f5027 5555555555555555
> (XEN)  L3[0x057] = 0000000000000000 ffffffffffffffff
> (XEN)
> (XEN) ****************************************
> (XEN) Panic on CPU 2:
> (XEN) FATAL PAGE FAULT
> (XEN) [error_code=0002]
> (XEN) Faulting linear address: ffff8315ffffffe4
> (XEN) ****************************************
> (XEN)
> (XEN) Reboot in five seconds...
> 
> 
> 
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