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Bug 1149174 - targetcli failed to create block backstore
Summary: targetcli failed to create block backstore
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: python-rtslib
Version: 7.1
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Andy Grover
QA Contact: Bruno Goncalves
URL:
Whiteboard:
: 1172715 (view as bug list)
Depends On: 1151188
Blocks: 1129387
TreeView+ depends on / blocked
 
Reported: 2014-10-03 12:14 UTC by Bruno Goncalves
Modified: 2022-10-03 17:34 UTC (History)
3 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2015-03-05 13:31:22 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2015:0581 0 normal SHIPPED_LIVE python-rtslib bug fix update 2015-03-05 17:00:54 UTC

Description Bruno Goncalves 2014-10-03 12:14:16 UTC 
Description of problem:
Traceback when trying to create a block backtore device

Version-Release number of selected component (if applicable):
kernel-3.10.0-175.el7

How reproducible:
100%

Steps to Reproduce:
1.Try to device the backstore device being a loop device.


# dd if=/dev/zero of=/test.img count=1000 bs=1M
# losetup /dev/loop0 /test.img

# targetcli /backstores/block create target1-tpg1-lun1 /dev/loop0 
Traceback (most recent call last):
  File "/usr/bin/targetcli", line 89, in <module>
    main()
  File "/usr/bin/targetcli", line 72, in main
    shell.run_cmdline(" ".join(sys.argv[1:]))
  File "/usr/lib/python2.7/site-packages/configshell/shell.py", line 891, in run_cmdline
    self._execute_command(path, command, pparams, kparams)
  File "/usr/lib/python2.7/site-packages/configshell/shell.py", line 866, in _execute_command
    result = target.execute_command(command, pparams, kparams)
  File "/usr/lib/python2.7/site-packages/targetcli/ui_node.py", line 87, in execute_command
    pparams, kparams)
  File "/usr/lib/python2.7/site-packages/configshell/node.py", line 1417, in execute_command
    result = method(*pparams, **kparams)
  File "/usr/lib/python2.7/site-packages/targetcli/ui_backstore.py", line 387, in ui_command_create
    so = BlockStorageObject(name, dev, readonly=readonly, write_back=write_back)
  File "/usr/lib/python2.7/site-packages/rtslib/tcm.py", line 676, in __init__
    raise
TypeError: exceptions must be old-style classes or derived from BaseException, not NoneType

Actual results:


Expected results:


Additional info:
# fdisk -l /dev/loop0

Disk /dev/loop0: 1048 MB, 1048576000 bytes, 2048000 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Comment 1 Bruno Goncalves 2014-10-03 12:15:01 UTC 
Setting it as regression as using RHEL-7.0 kernel it works.

kernel-3.10.0-123.el7
Comment 3 Bruno Goncalves 2014-10-09 13:06:16 UTC 
The regression seems to have been inserted by BZ#1129387.

It works on kernel-3.10.0-161.el7, but it fails on kernel-3.10.0-161.el7.
Comment 4 Bruno Goncalves 2014-10-09 13:08:03 UTC 
Sorry, I meant to say it works on kernel -160.
Comment 5 Andy Grover 2014-10-09 19:53:04 UTC 
This backported patch in the kernel:

target: Don't allow setting WC emulation if device doesn't support

caused a bug in python-rtslib to manifest. So no changes for kernel, we just need to update python-rtslib.
Comment 6 Andy Grover 2014-10-09 20:00:37 UTC 
a workaround for now is to add "write_back=false" to the create command, e.g.:

targetcli /backstores/block create target1-tpg1-lun1 /dev/loop0 write_back=false
Comment 7 Bruno Goncalves 2014-10-29 08:23:39 UTC 
Problem has been fixed on python-rtslib-2.1.fb50-1.el7.noarch.

# rpm -q targetcli
targetcli-2.1.fb34-1.el7.noarch

3.10.0-175.el7


# targetcli /backstores/block create target1-tpg1-lun1 /dev/loop0
Created block storage object target1-tpg1-lun1 using /dev/loop0.

# targetcli ls
o- / ......................................................................................................................... [...]
  o- backstores .............................................................................................................. [...]
  | o- block .................................................................................................. [Storage Objects: 1]
  | | o- target1-tpg1-lun1 ......................................................... [/dev/loop0 (1000.0MiB) write-thru deactivated]
  | o- fileio ................................................................................................. [Storage Objects: 0]
  | o- pscsi .................................................................................................. [Storage Objects: 0]
  | o- ramdisk ................................................................................................ [Storage Objects: 0]
  o- iscsi ............................................................................................................ [Targets: 0]
  o- loopback ......................................................................................................... [Targets: 0]
Comment 9 Andy Grover 2014-12-10 19:22:37 UTC 
*** Bug 1172715 has been marked as a duplicate of this bug. ***
Comment 11 errata-xmlrpc 2015-03-05 13:31:22 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.

https://rhn.redhat.com/errata/RHBA-2015-0581.html
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