Re: KVM VM(windows xp) reseted when running geekbench for about 2days

[Zhanghaoyu (A)]

>> On Thu, Apr 18, 2013 at 12:00:49PM +0000, Zhanghaoyu (A) wrote:
>>> I start 10 VMs(windows xp), then running geekbench tool on them, 
>>> about 2 days, one of them was reset, I found the reset operation is 
>>> done by int kvm_cpu_exec(CPUArchState *env) {
>>>    ...
>>>       switch (run->exit_reason)
>>>       ...
>>>        case KVM_EXIT_SHUTDOWN:
>>>            DPRINTF("shutdown\n");
>>>            qemu_system_reset_request();
>>>            ret = EXCP_INTERRUPT;
>>>            break;
>>>    ...
>>> }
>>> 
>>> KVM_EXIT_SHUTDOWN exit reason was set previously in triple fault handle handle_triple_fault().
>>> 
>> How do you know that reset was done here? This is not the only place 
>> where qemu_system_reset_request() is called.
I used gdb to debug QEMU process, and add a breakpoint in qemu_system_reset_request(), when the case occurred, backtrace shown as below,
(gdb) bt
#0  qemu_system_reset_request () at vl.c:1964
#1  0x00007f9ef9dc5991 in kvm_cpu_exec (env=0x7f9efac47100)
    at /gt/qemu-kvm-1.4/qemu-kvm-1.4/kvm-all.c:1602
#2  0x00007f9ef9d5b229 in qemu_kvm_cpu_thread_fn (arg=0x7f9efac47100)
    at /gt/qemu-kvm-1.4/qemu-kvm-1.4/cpus.c:759
#3  0x00007f9ef898b5f0 in start_thread () from /lib64/libpthread.so.0
#4  0x00007f9ef86fa84d in clone () from /lib64/libc.so.6
#5  0x0000000000000000 in ?? ()

And, I add printk log in all place where KVM_EXIT_SHUTDOWN exit reason is set, only handle_triple_fault() was called.
>
>Make sure XP is not set to auto-reset in case of BSOD. 
No, winxp is not set to auto-reset in case of BSOD. No Winxp event log reported.
>
>Best regards,
>Yan.
>
>> 
>>> What causes the triple fault?
>>> 
>> Are you asking what is triple fault or why it happened in your case?
What I asked is why triple fault happened in my case.
>> For the former see here: http://en.wikipedia.org/wiki/Triple_fault
>> For the later it is to late to tell after VM reset. You can run QEMU 
>> with -no-reboot -no-shutdown. VM will pause instead of rebooting and 
>> then you can examine what is going on.
Great thanks, I'll run QEMU with -no-reboot -no-shutdown options, if VM paused in my case, what should I examined?

Thanks,
Zhang Haoyu
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