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Bug 736603

Summary: [libvirt][domblkinfo] libvirtd crash on domblkinfo.
Product: Red Hat Enterprise Linux 6 Reporter: David Naori <dnaori>
Component: libvirtAssignee: Michal Privoznik <mprivozn>
Status: CLOSED ERRATA QA Contact: Virtualization Bugs <virt-bugs>
Severity: urgent Docs Contact:
Priority: unspecified    
Version: 6.1CC: abaron, danken, ddumas, dnaori, dyuan, eblake, mgoldboi, mzhan, nzhang, rwu, syeghiay, veillard, ykaul, yupzhang
Target Milestone: betaKeywords: Regression
Target Release: ---   
Hardware: Unspecified   
OS: Linux   
Whiteboard:
Fixed In Version: libvirt-0.9.4-11.el6 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2011-12-06 11:28:40 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 638510    
Bug Blocks: 743047    

Description David Naori 2011-09-08 08:22:15 UTC 
Description of problem:
libvirtd crash on domblkinfo. 

# pgrep libvirtd 19191
# virsh -r domblkinfo 1 vda
error: End of file while reading data: Input/output error
# pgrep libvirtd 20472

No core-dump, nothing in logs.

Version-Release number of selected component (if applicable):
libvirt-0.9.4-10.el6.x86_64


How reproducible:
100%
Comment 2 David Naori 2011-09-08 08:24:21 UTC 
Worked on libvirt-0.9.4-7.el6.x86_64
Comment 3 Eric Blake 2011-09-08 08:32:35 UTC 
I suspect my snapshot patches may be involved; in particular, my guess is this upstream commit:

commit 89b6284fd94ce5b13ee6b002f9167f5d9074aa7a
Author: Eric Blake <eblake>
Date:   Fri Aug 19 20:38:36 2011 -0600

    snapshot: also support disks by path
    
    I got confused when 'virsh domblkinfo dom disk' required the
    path to a disk (which can be ambiguous, since a single file
    can back multiple disks), rather than the unambiguous target
    device name that I was using in disk snapshots.  So, in true
    developer fashion, I went for the best of both worlds - all
    interfaces that operate on a disk (aka block) now accept
    either the target name or the unambiguous path to the backing
    file used by the disk.
Comment 4 Daniel Veillard 2011-09-08 08:37:18 UTC 
yup seems to be an uninitialized disk variable should be easy to get fixed

Daniel
Comment 5 Eric Blake 2011-09-08 09:13:38 UTC 
Upstream patch proposed:
https://www.redhat.com/archives/libvir-list/2011-September/msg00379.html
Comment 6 Michal Privoznik 2011-09-08 10:03:28 UTC 
Moving to POST:

http://post-office.corp.redhat.com/archives/rhvirt-patches/2011-September/msg00286.html
Comment 10 yuping zhang 2011-09-09 02:55:20 UTC 
Reproduce this issue with libvirt-0.9.4-10.el6.x86_64.
Verified this issue with:
libvirt-0.9.4-11.el6.x86_64
kernel-2.6.32-193.el6.x86_64
qemu-kvm-0.12.1.2-2.185.el6.x86_64

# pgrep libvirtd
27271
# virsh -r domblkinfo 15 vda
Capacity:       8589934592
Allocation:     8589938688
Physical:       8589938688
# pgrep libvirtd
27271

So change the status to VERIFIED.
Comment 11 errata-xmlrpc 2011-12-06 11:28:40 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2011-1513.html