** Changed in: cinder
Status: Triaged => Incomplete
** Changed in: cinder
Status: Incomplete => Invalid
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https://bugs.launchpad.net/bugs/1161557
Title:
Race condition in handling of udev generated symlinks
Status in Cinder:
Invalid
Status in OpenStack Compute (Nova):
Opinion
Bug description:
In several components in both Cinder and Nova udev provided symlinks are
expected to appear immediately.
This is not the case as udev rules run async of device plugging.
Volume drivers in Cinder and the libvirt driver in Nova seem to be the
primary culprits.
To solve this we should wait for udevd to finish processing events, this can
be done with udevadm by calling settle. This is done by simply calling "udevadm
settle". Additionally it can be called with a timeout (probably a good idea).
Excerpt from udevadm settle --help:
Usage: udevadm settle OPTIONS
--timeout=<seconds> maximum time to wait for events
--seq-start=<seqnum> first seqnum to wait for
--seq-end=<seqnum> last seqnum to wait for
--exit-if-exists=<file> stop waiting if file exists
--quiet do not print list after timeout
--help
For more intelligent use we could wrap this in a function that can use
the --exit-if-exists behavior.
This will ensure the symlink actually exists before we try use it.
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