[Xen-bugs] [Bug 510] New: Live migration results in VM Kernel BUG - Invalid Opcode

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http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=510

           Summary: Live migration results in VM Kernel BUG - Invalid Opcode
           Product: Xen
           Version: 3.0 (general)
          Platform: x86-64
        OS/Version: Linux-2.6
            Status: NEW
          Severity: major
          Priority: P2
         Component: Unspecified
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: Brian.Carb@xxxxxxxxxx


We have 2 installations of sles10 beta2 (bundled with xen 3.x changeset 8628
), on 2 Dells. We created a minimal sles10 file-backed vbd on an nfs share 
using the sles "install into directory" feature. The share was mounted 
identically on the 2 Dells. On one Dell, we started this VM (via xm create) 
and loged in. We had xentop running in a terminal session on both Dells. When 
we tried to migrate the VM, xentop showed that the VM had started on the 
target, but when we connected a console to it, we saw the error below. We got 
the same error when we attempted the migration in the other direction 
(initiating the migration from the other Dell box).

Kernel BUG at drivers/xen/core/evtchn.c:660
invalid opcode: 0000 [1] SMP
CPU 0
Modules linked in: ipv6 loop dm_mod
Pid: 2111, comm: suspend Not tainted 2.6.16-rc1-git3-4-
xen #1
RIP: e030:[] 
{irq_resume+99}
RSP: e02b:ffff880000673ed8 EFLAGS: 00010013
RAX: ffffffff80483900 RBX: 0000000000000000 RCX: 
0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 
0000000000000000
RBP: ffffffff8023e10b R08: ffffffff80440080 R09: 
0000000000000000
R10: ffffffff804097a0 R11: 0000000000000200 R12: 
ffff88000049bc28
R13: 0000000000000000 R14: ffff88000049bc18 R15: 
ffffffff80139d0e
FS: 00002b281c764400(0000) GS:ffffffff80440000(0000) 
knlGS:ffffffff80440180
CS: e033 DS: 0000 ES: 0000
Process suspend (pid: 2111, threadinfo 
ffff880000672000, task ffff880000604100)
Stack: 0000000400007ff0 ffffffffff570000 
ffff880000673eb8 ffff88000049bc18
0000000000000000 ffffffff8023e472 
ffff88000049bc18 ffffffff80139d0e
0000000000000000 ffffffff80139ff7
Call Trace: {__do_suspend+871} 
{keventd_create_kthread+0}
{kthread+212} 
{child_rip+8}
{keventd_create_kthread+0} 
{kthread+0}
{child_rip+0}

Code: 0f 0b 68 eb cf 2f 80 c2 94 02 ff c1 83 f9 08 75 
d8 48 c7 c0
RIP {irq_resume+99} RSP 

<3>Debug: sleeping function called from invalid 
context at include/linux/rwsem.h:43
in_atomic():0, irqs_disabled():1

Call Trace: {profile_task_exit+21}
{do_exit+32} 
{kernel_math_error+0}
{do_invalid_op+163} 
{irq_resume+99}
{activate_task+140} 
{_spin_unlock_irqrestore+9}
{try_to_wake_up+988} 
{__do_suspend+0}
{error_exit+0} 
{keventd_create_kthread+0}
{__do_suspend+0} 
{irq_resume+99}
{irq_resume+10} 
{__do_suspend+871}
{keventd_create_kthread+0} 
{kthread+212}
{child_rip+8} 
{keventd_create_kthread+0}
{kthread+0} 
{child_rip+0}

XM info:

system : Linux
host : m1058
release : 2.6.16-rc1-git3-4-xen
version : #1 SMP Tue Jan 24 16:43:20 
UTC 2006
machine : x86_64
nr_cpus : 4
nr_nodes : 1
sockets_per_node : 2
cores_per_socket : 1
threads_per_core : 2
cpu_mhz : 3591
hw_caps : 
bfebfbff:20100800:00000000:00000080:0000659d
total_memory : 8192
free_memory : 137
xen_major : 3
xen_minor : 0
xen_extra : _8628-2
xen_caps : xen-3.0-x86_64
platform_params : virt_start=0xffff800000000000
xen_changeset : 8628
cc_compiler : gcc version 4.1.0 20060109 
(prerelease) (SUSE Linux)
cc_compile_by : abuild
cc_compile_domain : suse.de
cc_compile_date : Mon Jan 23 10:24:30 UTC 2006

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