We have random failures of loop device tests on jenkins (see example bellow).

Barak commented that losetup -f /path does not work sometimes in the CI

but I don't recall what it the alternative way to get a loop device.

We need a reliable way to create a loop device for vdsm tests. What

is the recommended way to do this?

Until we have a reliable solution I'm going to mark this test as broken

on ovirt CI:

https://gerrit.ovirt.org/#/c/86241/

Please report if you see other tests fail with this error - typically:

Error: Command ['losetup', '--find', '--show', '/tmp/tmp17Wqri/file'] failed with rc=1 out='' err='losetup: /tmp/tmp17Wqri/file: failed to set up loop device: No such file or directory\n'

http://jenkins.ovirt.org/job/vdsm_master_check-patch-el7-x86_64/20862/consoleFull

00:05:48.766 ======================================================================
00:05:48.766 ERROR: test_attach_detach_manually (loopback_test.TestDevice)
00:05:48.767 ----------------------------------------------------------------------
00:05:48.767 Traceback (most recent call last):
00:05:48.767   File "/home/jenkins/workspace/vdsm_master_check-patch-el7-x86_64/vdsm/tests/testValidation.py", line 191, in wrapper
00:05:48.768     return f(*args, **kwargs)
00:05:48.768   File "/home/jenkins/workspace/vdsm_master_check-patch-el7-x86_64/vdsm/tests/loopback_test.py", line 56, in test_attach_detach_manually
00:05:48.768     device.attach()
00:05:48.768   File "/home/jenkins/workspace/vdsm_master_check-patch-el7-x86_64/vdsm/tests/loopback.py", line 56, in attach
00:05:48.769     raise cmdutils.Error(cmd, rc, out, err)
00:05:48.769 Error: Command ['losetup', '--find', '--show', '/tmp/tmp17Wqri/file'] failed with rc=1 out='' err='losetup: /tmp/tmp17Wqri/file: failed to set up loop device: No such file or directory\n'
00:05:48.770 -------------------- >> begin captured logging << --------------------
00:05:48.770 2018-01-11 13:42:45,676 DEBUG (MainThread) [root] /usr/bin/taskset --cpu-list 0-1 losetup --find --show /tmp/tmp17Wqri/file (cwd None) (commands:65)
00:05:48.771 2018-01-11 13:42:45,733 DEBUG (MainThread) [root] FAILED: <err> = 'losetup: /tmp/tmp17Wqri/file: failed to set up loop device: No such file or directory\n'; <rc> = 1 (commands:86)
00:05:48.772 --------------------- >> end captured logging << ---------------------