Bug 795787

Summary: No error code when qemu pauses VM due to IO Error
Product: [Fedora] Fedora Reporter: Jakub Libosvar <jlibosva>
Component: libvirtAssignee: Jiri Denemark <jdenemar>
Status: CLOSED WORKSFORME QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: urgent Docs Contact:
Priority: unspecified    
Version: 16CC: berrange, clalancette, crobinso, dallan, dougsland, itamar, jforbes, laine, libvirt-maint, veillard, virt-maint
Target Milestone: ---   
Target Release: ---   
Hardware: x86_64   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2012-11-26 16:58:47 EST Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Bug Depends On:    
Bug Blocks: 786819    
Attachments:
Description Flags
Libvirtd.log none

Description Jakub Libosvar 2012-02-21 09:30:53 EST
Created attachment 564695 [details]
Libvirtd.log

Description of problem:
In vdsm the event from qemu is registered using domainEventRegisterAny method on event libvirt.VIR_DOMAIN_EVENT_ID_IO_ERROR_REASON. When qemu pauses VM due to IO error (no permissions on VM's image), the error code from qemu is empty string in event handler function:

('/rhev/data-center/f5c0fd9a-4d0b-491a-afd4-bbfb067ee23a/03f424dc-a4b3-4e00-96dd-cdc9fcd77054/images/7c7eb8ab-32d8-41a4-b298-0819617faafc/b679409a-f27f-47ac-908b-56cef9b6e62b', 'virtio-disk0', 1, '', (<clientIF.clientIF instance at 0x2b994d0>, 6))

Version-Release number of selected component (if applicable):
libvirt-0.9.6-4.fc16.x86_64

How reproducible:
Always

Steps to Reproduce:
1. Change permissions on running VM's image to 0000
2. Wait till VM get's paused
3. Check the qemu error code in libvirt
  
Actual results:
It's empty string

Expected results:
EIO or EOTHER

Additional info:
from libvirtd.log (attached)
2012-02-21 14:17:32.356+0000: 1150: debug : qemuProcessHandleIOError:650 : Transitioned guest VM to paused state due to IO error
2012-02-21 14:17:32.356+0000: 1150: debug : qemuProcessHandleIOError:660 : Preserving lock state '(null)'
Comment 1 Cole Robinson 2012-10-20 19:23:17 EDT
Hmm, I couldn't reproduce any disk error on F17 using those instructions. Guest starts up, change disk permissions to 0000, and it seems to happily chug along.

Jakub, can you reproduce the issue on F17?
Comment 2 Cole Robinson 2012-11-26 16:58:47 EST
No response for a month (and F16 is approaching EOL), so closing. If this can be reproduced on latest Fedora, please reopen and provide the info requested in Comment #1