[Xen-devel] dom0 pvops crash apparently due to guest migration

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

One of my test boxes encountered the crash whose oops you see below.
It doesn't do it every time, or even every time on this machine (since
the credit2 test in the same run worked).  The crash seems to have
occurred just at the end of the migration of a PV guest.

The setup is 32-bit dom0 and domU on 64-bit Xen.
The pvops kernel version was 56eabf9f2a6632d3b2ef.

The complete logs are here:
  
http://www.chiark.greenend.org.uk/~xensrcts/logs/2847/test-amd64-i386-xl-multivcpu/
(The machine has since been reused so those logs are what there is.)

Ian.

------------[ cut here ]------------
kernel BUG at arch/x86/mm/fault.c:210!
invalid opcode: 0000 [#1] SMP 
last sysfs file: /sys/devices/virtual/net/lo/operstate
Modules linked in: e1000e [last unloaded: scsi_wait_scan]

Pid: 22, comm: xenwatch Not tainted (2.6.32.26 #1)         
EIP: 0061:[<c104c058>] EFLAGS: 00010082 CPU: 0
EIP is at vmalloc_sync_one+0x118/0x128
EAX: 003f8360 EBX: 1fc1b067 ECX: ffffffe0 EDX: ab273fff
ESI: 00000000 EDI: c182adf0 EBP: dfcdbe88 ESP: dfcdbe64
 DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0069
Process xenwatch (pid: 22, ti=dfcda000 task=dfccc510 task.ti=dfcda000)
Stack:
 dbd7b384 00cdbe88 00000000 c568f200 dbd7b384 ab273fff f7c00000 c568f200
<0> dbd7b384 dfcdbea8 c104ca9a c182adf0 c1780204 dbd75f40 dfd45a20 dbd75f40
<0> dfcdbf5c dfcdbeb4 c10df14a dfcdbf1c dfcdbef8 c12313b1 0000001b 00000008
Call Trace:
 [<c104ca9a>] ? vmalloc_sync_all+0x5c/0xbe
 [<c10df14a>] ? alloc_vm_area+0x44/0x4b
 [<c12313b1>] ? blkif_map+0x2d/0x204
 [<c1230cbb>] ? frontend_changed+0x194/0x209
 [<c1229b39>] ? xenbus_otherend_changed+0x5c/0x61
 [<c1229c97>] ? frontend_changed+0xa/0xd
 [<c1228783>] ? xenwatch_thread+0xf6/0x11e
 [<c10795df>] ? autoremove_wake_function+0x0/0x33
 [<c122868d>] ? xenwatch_thread+0x0/0x11e
 [<c1079397>] ? kthread+0x61/0x66
 [<c1079336>] ? kthread+0x0/0x66
 [<c1030dd7>] ? kernel_thread_helper+0x7/0x10
Code: eb fe 89 d8 89 f2 ff 15 08 7d 68 c1 89 d6 8b 55 f0 89 c3 89 c8 0f ac d0 
0c 89 c1 89 d8 0f ac f0 0c c1 e1 05 c1 e0 05 39 c1 74 06 <0f> 0b eb fe 31 ff 83 
c4 18 89 f8 5b 5e 5f 5d c3 55 89 e5 56 53 
EIP: [<c104c058>] vmalloc_sync_one+0x118/0x128 SS:ESP 0069:dfcdbe64
---[ end trace 7b608ed9c5e5ed4e ]---

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