XenAPI: dd into config drive must use direct IO
Bug #1259163 reported by
Bob Ball
This bug affects 1 person
| Affects | Status | Importance | Assigned to | Milestone | |
|---|---|---|---|---|---|
| OpenStack Compute (nova) |
Fix Released
|
Low
|
Bob Ball | ||
Bug Description
There is a theoretical race condition between dd and VBD.unplug in the nova compute VM where we are using non-direct IO meaning the device might not be synced before we attempt to unplug.
This _may_ be related to the frequency of the following message seen in the guest.
[17765.790561] vbd vbd-51744: 16 Device in use; refusing to close
| Changed in nova: | |
| importance: | Undecided → Medium |
| assignee: | nobody → Bob Ball (bob-ball) |
| tags: | added: xenserver |
| Changed in nova: | |
| milestone: | none → icehouse-2 |
| description: | updated |
| Changed in nova: | |
| status: | New → In Progress |
| Changed in nova: | |
| importance: | Medium → Low |
| description: | updated |
| Changed in nova: | |
| milestone: | icehouse-2 → icehouse-3 |
Revision history for this message
| OpenStack Infra (hudson-openstack) wrote Fix merged to nova (master) | #1 |
| Changed in nova: | |
| status: | In Progress → Fix Committed |
| Changed in nova: | |
| status: | Fix Committed → Fix Released |
| Changed in nova: | |
| milestone: | icehouse-3 → 2014.1 |
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Reviewed: https:/
Committed: https:/
Submitter: Jenkins
Branch: master
commit 5b0c8f0b967c4e6
Author: Bob Ball <email address hidden>
Date: Mon Dec 9 13:27:17 2013 +0000
XenAPI: Use direct IO for writing config drive
If you don't use direct IO when writing to the device, the unplug
immediately following this may not succeed as the device may still
be in use.
Also add a sync to ensure the device is not being used at the point
of unplug.
Closes-bug: 1259163
Change-Id: I68f09835648b36