Comment 28 for bug 683938

It seems that even the create/remove part is not necessary. Repeating the mount requests eventually results in a crash. I played around with the RPC and NFS debugging options to see what is going on. Comparing the first and last one that did not crash seems to show no difference (beside of some unix credentials that are released at different times but that has happened in between without crashing).
Given that the crash was a hard lockup again, I am not sure the data of the last try is complete.

Comparing the case of trying to mount a directory which is not exported and the one crashing, there is a difference. In the first case the error is returned by the server. While in the case we test, the request is seen as success but then the authentication flavours do not match and the client does an explicit umount request (probably the same happens when the authentication methods are supported but the authentication fails).