[Qemu-devel] [Bug 1242963] Re: QEMU loadvm causes guest OS freeze

[NanothylL]

Hi guys,

This bug has reported in a very long time.  I have tested v1.7.0, v1.7.1 and 
even v2.0.0rc1, v2.0.0rc2.
The bug is still there. This is very easy to reproduce. I dunno why it is not 
fixed until today.

I think living-snapshot is a very important feature for Qemu. Somebody can take 
a look at this issue.
Or at least, give me some tips to let me know how to fix this?

Thanks!

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https://bugs.launchpad.net/bugs/1242963

Title:
  QEMU loadvm causes guest OS freeze

Status in QEMU:
  New

Bug description:
  HOST: ubuntu 13.10 x64
  GUEST: winxp sp 3 x86

  AFFECT QEMU(tested): v1.5.2, v1.5.3,  v1.6.0, v1.6.1

  I compile QEMU by myself with "./configure --target-list=i386-softmmu && make 
&& make install".
  After installing a winxp sp3 into the qemu-system-i386 with command line:
  > qemu-system-i386 -m 512 -hda xp.img -net user -net nic,model=rtl8139 -rtc 
base=localtime,clock=vm

  I use monitor to create a live snapshot: 
  > stop
  > savevm xxx
  > cont

  And then I load this snapshot (I also try it in commad line: -loadvm xxx):
  > loadvm xxx
  > cont

  After that, the windows system is freeze (don't accept any keyboard or
  mouse input, although I knew vcpu is still working).

  If I compile with -enable-kvm and launch qemu-system-i386 with -enable-kvm, 
it looks like everything works well.
  I think it is a bug for qemu system.

  BTW: freeze is not appearing 100%, but in my test, 95% cases would
  cause system freeze.

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