One of our customers is hitting what appears to be LU-1101. They are also running torque, here is the message from the customer:

We use torque as resource manager and job start fails because of mkdir() returns EPERM. The only workaround we have for this is to not set the tmpdir in torque, which is suboptimal. Other applications might suffer the same bug. Quantum espresso is reported to fail as well (in the lustre bug report) and we have users running it.

The bug was originally reported in bz 23459:
https://bugzilla.lustre.org/show_bug.cgi?id=23459

The patch which appears to be the root cause was added as part of bz 18534:
https://bugzilla.lustre.org/show_bug.cgi?id=18534

Thanks.