Comment 4 for bug 739088

this issue occurred again. So reopen this bug.
I use upstream kvm.git ef7c782ea and qemu-kvm.git 44755ea36.
The host is rhel6.1 with lastest kvm and qemu-kvm installed, and its file system type is ext4.
here's the dmesg info in rhel5u5 guest after being restored.
-----------------------------------------log--------------------------------------
hda: status error: status=0x00 { }
ide: failed opcode was: unknown
hda: drive not ready for command
hda: status error: status=0x00 { }
ide: failed opcode was: unknown
hda: drive not ready for command
hda: status error: status=0x00 { }
ide: failed opcode was: unknown
hda: drive not ready for command
hda: status error: status=0x00 { }
ide: failed opcode was: unknown
hda: drive not ready for command
ide0: reset: master: error (0x00?)
hda: status error: status=0x00 { }
ide: failed opcode was: unknown
hda: drive not ready for command
hda: status error: status=0x00 { }
ide: failed opcode was: unknown
hda: drive not ready for command
hda: status error: status=0x00 { }
ide: failed opcode was: unknown
hda: drive not ready for command
hda: status error: status=0x00 { }
ide: failed opcode was: unknown
hda: drive not ready for command
ide0: reset: master: error (0x00?)
end_request: I/O error, dev hda, sector 32991
end_request: I/O error, dev hda, sector 32999
end_request: I/O error, dev hda, sector 33007
end_request: I/O error, dev hda, sector 4465351
Buffer I/O error on device hda1, logical block 558161
Aborting journal on device hda1.
lost page write due to I/O error on hda1
end_request: I/O error, dev hda, sector 4465359
Buffer I/O error on device hda1, logical block 558162
lost page write due to I/O error on hda1
end_request: I/O error, dev hda, sector 13447
Buffer I/O error on device hda1, logical block 1673
lost page write due to I/O error on hda1
__journal_remove_journal_head: freeing b_committed_data
journal commit I/O error
ext3_abort called.
EXT3-fs error (device hda1): ext3_journal_start_sb: Detected aborted journal
Remounting filesystem read-only