[Qemu-devel] [Bug 739088] [NEW] I/O errors after "Save/Restore"

[Yongjie Ren]

Public bug reported:

qemu-kvm commit: b73357ecd2b14c057134cb71d29447b5b988c516
( Author: Marcelo Tosatti <address@hidden>    Date:   Wed Mar 16 17:04:16 2011 
-0300)
kvm commit: a72e315c509376bbd1e121219c3ad9f23973923f

After restoring from saved img, some I/O errors appear in dmesg and file
system is read-only.  I'm sure that the  guest runs normally before
saving. See the pictures attached in detail.

Reproduce steps:
----------------
1.create a guest:
  qemu-img create -b /share/xvs/img/app/ia32e_SMP.img -f qcow2 
/root/test0320.img
  qemu-system-x86_64  -m 256  -net nic,macaddr=00:16:3e:06:8a:08,model=rtl8139 
-net tap,script=/etc/kvm/qemu-ifup -hda /root/test0320.img
2.save the guest: 
  on qemu monitor: migrate "exec:dd of=/root/test-save.img"
3.quit from qemu: 
  "q" command on qemu monitor
4.restore from img just saved:
  qemu-system-x86_64  -m 256  -net nic,macaddr=00:16:3e:06:8a:08,model=rtl8139 
-net tap,script=/etc/kvm/qemu-ifup -incoming=/roo/test-save.img
5.see dmesg in restored guest, you'll find some I/O errors. And run some
commands such as "ps", "touch","reboot" and so on. Then some I/O errors appear.

** Affects: qemu
     Importance: Undecided
         Status: New


** Tags: error io

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https://bugs.launchpad.net/bugs/739088

Title:
  I/O errors after "Save/Restore"

Status in QEMU:
  New

Bug description:
  qemu-kvm commit: b73357ecd2b14c057134cb71d29447b5b988c516
  ( Author: Marcelo Tosatti <address@hidden>    Date:   Wed Mar 16 17:04:16 
2011 -0300)
  kvm commit: a72e315c509376bbd1e121219c3ad9f23973923f

  After restoring from saved img, some I/O errors appear in dmesg and
  file system is read-only.  I'm sure that the  guest runs normally
  before saving. See the pictures attached in detail.

  Reproduce steps:
  ----------------
  1.create a guest:
    qemu-img create -b /share/xvs/img/app/ia32e_SMP.img -f qcow2 
/root/test0320.img
    qemu-system-x86_64  -m 256  -net 
nic,macaddr=00:16:3e:06:8a:08,model=rtl8139 -net tap,script=/etc/kvm/qemu-ifup 
-hda /root/test0320.img
  2.save the guest: 
    on qemu monitor: migrate "exec:dd of=/root/test-save.img"
  3.quit from qemu: 
    "q" command on qemu monitor
  4.restore from img just saved:
    qemu-system-x86_64  -m 256  -net 
nic,macaddr=00:16:3e:06:8a:08,model=rtl8139 -net tap,script=/etc/kvm/qemu-ifup 
-incoming=/roo/test-save.img
  5.see dmesg in restored guest, you'll find some I/O errors. And run some
  commands such as "ps", "touch","reboot" and so on. Then some I/O errors 
appear.