[VDSM] loop device tests fail again on jenkins

[Barak Korren]

I thought I explained this before.

Writing to losetup from inside mock gets you a device outside mock that is
invisible inside.

The way to solve this is to run mknod a few times to get the needed device
files.

You can see examples of this in the ovirt-node build scripts.

Barak Korren
bkorren at redhat.com
RHCE, RHCi, RHV-DevOps Team
https://ifireball.wordpress.com/

בתאריך 11 בינו׳ 2018 04:35 PM,‏ "Nir Soffer" <nsoffer at redhat.com> כתב:

> 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 << ---------------------
>
>
>
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