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Worker fails with error "DIE runcmd failed with exit code 1 at /usr/lib/os-autoinst/osutils.pm line 127.
",see: http://moon.qa.suse.cz/tests/1664/file/autoinst-log.txt

After a quick investigation the error came from the 'chattr' command.

Version 4.5.1518541136.0ac2c9f6 added the following change:

• qemu: disable CoW for the HDD image directory (#790)

With this command in /usr/lib/os-autoinst/backend/qemu.pm, line 609:
runcmd('/usr/bin/chattr', '-f', '+C', $basedir);

But this chattr call failed if the filesystem is not btrfs (this is my case, I use xfs).

So, maybe a test of the filesystem type is needed before, or simply just ignore the error (but ignoring an error is not good ;-)).