[Qemu-devel] [Bug 584516] Re: opensuse 11.2 guest hangs after live migration with clocksource=kvm-clock

[Thomas Huth]

This bug ticket is quite old already ... can you still reproduce this
issue with the latest version of QEMU?

** Changed in: qemu
       Status: New => Incomplete

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Title:
  opensuse 11.2 guest hangs after live migration with clocksource=kvm-
  clock

Status in QEMU:
  Incomplete

Bug description:
  i would like to debug a problem that I encountered some time ago with 
opensuse 11.2 and also
  with Ubuntu (karmic/lucid).

  If I run an opensuse guest 64-bit and do not touch the clocksource settings 
the guest almost
  everytime hangs after live migration at:

  (gdb) thread apply all bt

  Thread 2 (Thread 0x7f846782a950 (LWP 27356)):
  #0  0x00007f8467d24cd7 in ioctl () from /lib/libc.so.6
  #1  0x000000000042b945 in kvm_run (env=0x2468170)
    at /usr/src/qemu-kvm-0.12.4/qemu-kvm.c:921
  #2  0x000000000042cea2 in kvm_cpu_exec (env=0x2468170)
    at /usr/src/qemu-kvm-0.12.4/qemu-kvm.c:1651
  #3  0x000000000042d62c in kvm_main_loop_cpu (env=0x2468170)
    at /usr/src/qemu-kvm-0.12.4/qemu-kvm.c:1893
  #4  0x000000000042d76d in ap_main_loop (_env=0x2468170)
    at /usr/src/qemu-kvm-0.12.4/qemu-kvm.c:1943
  #5  0x00007f8468caa3ba in start_thread () from /lib/libpthread.so.0
  #6  0x00007f8467d2cfcd in clone () from /lib/libc.so.6
  #7  0x0000000000000000 in ?? ()

  Thread 1 (Thread 0x7f84692d96f0 (LWP 27353)):
  #0  0x00007f8467d25742 in select () from /lib/libc.so.6
  #1  0x000000000040c25a in main_loop_wait (timeout=1000)
    at /usr/src/qemu-kvm-0.12.4/vl.c:3994
  #2  0x000000000042dcf1 in kvm_main_loop ()
    at /usr/src/qemu-kvm-0.12.4/qemu-kvm.c:2126
  #3  0x000000000040c98c in main_loop () at /usr/src/qemu-kvm-0.12.4/vl.c:4212
  #4  0x000000000041054b in main (argc=31, argv=0x7fffa91351c8,
    envp=0x7fffa91352c8) at /usr/src/qemu-kvm-0.12.4/vl.c:6252

  If I run the same guest with kernel parameter clocksource=acpi_pm, the
  migration succeeds reliably.

  The hosts runs:
  /kernel: /2.6.33.3, /bin: /qemu-kvm-0.12.4, /mod: /2.6.33.3

  I invoke qemu-kvm with:
  /usr/bin/qemu-kvm-0.12.4  -net none  -drive 
file=/dev/sdb,if=ide,boot=on,cache=none,aio=native  -m 1024 -cpu 
qemu64,model_id='Intel(R) Xeon(R) CPU           E5430  @ 2.66GHz'  -monitor 
tcp:0:4001,server,nowait -vnc :1 -name 'test'  -boot order=dc,menu=on  -k de  
-pidfile /var/run/qemu/vm-149.pid  -mem-path /hugepages -mem-prealloc  -rtc 
base=utc,clock=vm -usb -usbdevice tablet

  The Guest is:
  OpenSuse 11.2 64-bit with Kernel 2.6.31.5-0.1-desktop #1 SMP PREEMPT 
2009-10-26 15:49:03 +0100 x86_64
  The clocksource automatically choosen is kvm-clock.

  Feedback appreciated. I have observed the same problem with 0.12.2 and
  also with old binaries provided by Ubuntu Karmic (kvm-88).

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