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Bug 1590024

Summary: Failure to run qemu-img map on a file with multiple blocks
Product: Red Hat Enterprise Linux 7 Reporter: Ademar Reis <areis>
Component: qemu-kvm-rhevAssignee: Eric Blake <eblake>
Status: CLOSED DUPLICATE QA Contact: Tingting Mao <timao>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 7.4CC: amit, berrange, cfergeau, chayang, coli, danken, dwmw2, eblake, extras-qa, itamar, juzhang, kwolf, michen, mlipchuk, ngu, nsoffer, pbonzini, pingl, qzhang, rjones, virt-maint, virt-maint
Target Milestone: rcKeywords: Regression
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: 1589738 Environment:
Last Closed: 2018-08-21 12:30:47 UTC Type: Bug
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: 1589738    
Bug Blocks:    

Description Ademar Reis 2018-06-11 22:21:55 UTC 
+++ This bug was initially created as a clone of Bug #1589738 +++

Description of problem:
We have encountered a failure running qemu-img map on a file with multiple blocks.

Failure qemu-img map on FC28:

# rpm -qa | grep qemu
qemu-audio-alsa-2.12.0-0.5.rc1.fc28.x86_64
qemu-block-curl-2.12.0-0.5.rc1.fc28.x86_64
qemu-block-nfs-2.12.0-0.5.rc1.fc28.x86_64
qemu-ui-sdl-2.12.0-0.5.rc1.fc28.x86_64
qemu-img-2.12.0-0.5.rc1.fc28.x86_64
qemu-common-2.12.0-0.5.rc1.fc28.x86_64
qemu-audio-oss-2.12.0-0.5.rc1.fc28.x86_64
qemu-audio-sdl-2.12.0-0.5.rc1.fc28.x86_64
qemu-block-dmg-2.12.0-0.5.rc1.fc28.x86_64
qemu-block-iscsi-2.12.0-0.5.rc1.fc28.x86_64
qemu-block-rbd-2.12.0-0.5.rc1.fc28.x86_64
qemu-ui-gtk-2.12.0-0.5.rc1.fc28.x86_64
qemu-system-x86-core-2.12.0-0.5.rc1.fc28.x86_64
qemu-kvm-2.12.0-0.5.rc1.fc28.x86_64
libvirt-daemon-driver-qemu-4.2.0-1.fc28.x86_64
ipxe-roms-qemu-20170710-3.git0600d3ae.fc28.noarch
qemu-audio-pa-2.12.0-0.5.rc1.fc28.x86_64
qemu-block-gluster-2.12.0-0.5.rc1.fc28.x86_64
qemu-ui-curses-2.12.0-0.5.rc1.fc28.x86_64
qemu-system-x86-2.12.0-0.5.rc1.fc28.x86_64

[root@dhcp163-43 vdsm]# python
Python 2.7.15 (default, May 16 2018, 17:50:09) 
[GCC 8.1.1 20180502 (Red Hat 8.1.1-1)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import io
>>> filename = "/tmp/test2"
>>> with io.open(filename, "wb") as f:
...     f.write(b"x")
...     f.seek(16 * 1024)
...     f.write(b"x")
...     f.seek(42 * 1024)
...     f.write(b"x")
... 
1L
16384L
1L
43008L
1L
>>> 

Run the following command on that file:
    /usr/bin/qemu-img map --output json /tmp/test2

/usr/bin/qemu-img map --output json /tmp/test2
[{ "start": 0, "length": 4096, "depth": 0, "zero": false, "data": true, "offset": 0},
{ "start": 4096, "length": 12288, "depth": 0, "zero": true, "data": false, "offset": 4096},
{ "start": 16384, "length": 4096, "depth": 0, "zero": false, "data": true, "offset": 16384},
qemu-img: /builddir/build/BUILD/qemu-2.12.0-rc1/qemu-img.c:2680: get_block_status: Assertion `bytes' failed.
Aborted (core dumped)


A successful qemu-img map on FC27
# rpm -qa | grep qemu
qemu-system-x86-2.11.0-4.fc27.x86_64
qemu-guest-agent-2.11.0-4.fc27.x86_64
qemu-block-rbd-2.11.0-4.fc27.x86_64
qemu-img-2.11.0-4.fc27.x86_64
qemu-system-x86-core-2.11.0-4.fc27.x86_64
qemu-block-iscsi-2.11.0-4.fc27.x86_64
libvirt-daemon-driver-qemu-4.0.0-2.fc27.x86_64
ipxe-roms-qemu-20170710-3.git0600d3ae.fc27.noarch
qemu-sanity-check-nodeps-1.1.5-8.fc27.x86_64
qemu-kvm-2.11.0-4.fc27.x86_64
qemu-block-dmg-2.11.0-4.fc27.x86_64
qemu-common-2.11.0-4.fc27.x86_64
qemu-block-nfs-2.11.0-4.fc27.x86_64
qemu-block-ssh-2.11.0-4.fc27.x86_64
qemu-block-gluster-2.11.0-4.fc27.x86_64
qemu-block-curl-2.11.0-4.fc27.x86_64

Creating a file with the following python script:

>>> import io
>>> filename = "/tmp/test"
>>> with io.open(filename, "wb") as f:
...     f.write(b"x")
...     f.seek(16 * 1024)
...     f.write(b"x")
...     f.seek(42 * 1024)
...     f.write(b"x")
... 
1L
16384L
1L
43008L
1L

Run the following command on that file:
    /usr/bin/qemu-img map --output json /tmp/test

Output:
[{ "start": 0, "length": 4096, "depth": 0, "zero": false, "data": true, "offset": 0},
{ "start": 4096, "length": 12288, "depth": 0, "zero": true, "data": false, "offset": 4096},
{ "start": 16384, "length": 4096, "depth": 0, "zero": false, "data": true, "offset": 16384},
{ "start": 20480, "length": 20480, "depth": 0, "zero": true, "data": false, "offset": 20480},
{ "start": 40960, "length": 2560, "depth": 0, "zero": false, "data": true, "offset": 40960}]

Version-Release number of selected component (if applicable):


How reproducible:
100%

Steps to Reproduce:
1.
2.
3.

Actual results:


Expected results:


Additional info:

--- Additional comment from Nir Soffer on 2018-06-11 07:42:43 BRT ---

Kevin, can you take a look?

--- Additional comment from Eric Blake on 2018-06-11 18:46:07 BRT ---

Patch posted upstream:
https://lists.gnu.org/archive/html/qemu-devel/2018-06/msg02905.html
Comment 2 Nir Soffer 2018-08-19 18:53:57 UTC 
Eric, is this fixed in RHEL 7.6?
Comment 3 Eric Blake 2018-08-21 12:30:47 UTC 

*** This bug has been marked as a duplicate of bug 1601310 ***