"An unexpected error occurred" when two builds are triggered

[humitos]

Triggering the build twice almost at the same time in my local instance makes the second build (the one that receives the LockTimeout exception) to show An unexpected error occurred instead of Version locked, retrying in 5 minutes

Also, the first one also fails with the same error but most of the commands where executed:

(when running just one build it works properly)

[geerlingguy]

I seem to be running into this today as well: https://readthedocs.org/projects/drupal-vm/builds/5463920/

[dlech]

This is currently a problem for me too with https://readthedocs.org/projects/grx/

Except I am also getting "Version locked, retrying in 5 minutes.", so I am being spammed every 5 minutes with error emails (currently 222 unread messages in my inbox this morning!)

[RichardLitt]

Related to #3180.

[edmorley]

We're seeing this too:
https://readthedocs.org/projects/treeherder/builds/6211065/

[humitos]

I'm closing this one since the original problem was solved. I'm getting the version locked error which is the correct. Please feel free to open other issue if you have a similar problem. Thanks.