[LU-13807] LNet: Net delete dead lock deadlock

Related — Fri, 7 Aug 2020 20:25:06 +0000

While using an LUTF script which deletes a net dynamically via

lnetctl import --del config.yaml

We ran into a dead lock.

It appears like a local NI is in recovery. A message is about to get sent to this NI. We call lnet_nid2peerni_locked() which locks the mutex. However this mutex is held by the process trying to delete the net, leading to a dead lock.

The code should first clean up the recovery queue. IE remove all instances of this NI from the recovery queue before deleting the NI.

A similar processing is done in LNetNIFini()

Whamcloud Community JIRA

[LU-13807] LNet: Net delete dead lock deadlock