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[Qemu-devel] [Bug 1002121] Re: disk error when guest boot up via qcow2 i

From: Michael Tokarev
Subject: [Qemu-devel] [Bug 1002121] Re: disk error when guest boot up via qcow2 image
Date: Sat, 09 Jun 2012 19:16:10 -0000

I can't reproduce it no matter how I try

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  disk error when guest boot up via qcow2 image

Status in QEMU:

Bug description:
  Host OS (ia32/ia32e/IA64): ia32e
  Guest OS (ia32/ia32e/IA64): ia32e
  Guest OS Type (Linux/Windows): Linux(rhel6u1)
  kvm.git Commit: 51bfd2998113e1f8ce8dcf853407b76a04b5f2a0
  qemu-kvm Commit: e54f008ef8f968cfc2f3ecab78491d180fa31efc
  Host Kernel Version:3.4.0-rc7
  Hardware: WSM-EP, Romley-EP

  Bug detailed description:
  If I boot up a guest using qcow2 image, the guest show “disk read error”.  If 
you press some key to continue, after being automatically repaired, the guest 
can boot up.

  This should be a qemu-kvm regression.
  kvm      + qemu-kvm   =  result
  51bfd299 + e54f008e    =  bad 
  51bfd299 + b320b8b7   =  good

  1. guest rhel6u1, guest show “disk error”
     guest rhel6u2, guest show black screen
     this phenomenon occurs at the first time to create guest
  2. create guest with raw image, this phenomenon doesn’t appear.

  Reproduce steps:
  1.start up a host with kvm (commit: 51bfd299) and use qemu-kvm 
  2.qemu-img create –b /share/ia32e_rhel6u1.img –f qcow2
  3.qemu-system-x86_64 -mem 1024 –hda /root/rhel6u1.qcow

  Current result:
  Guest console shows:
  error 25:Disk read error
  Prss any key to continue...

  Expected result:
  Guest boot up correctly

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