Fish hangs indefinitely with no output if it cannot acquire a lock over NFS #7968
Description
Running fish, version 3.1.2 on Ubuntu 20.04.
This is somewhat related to #685. I have my home directory set up on nfs. I rebooted the nfs server and lost some sysctl parameters that set the nlockmgr ports to something my firewall would allow. The result being that locks cannot be acquired.
When running fish, it would hang indefinitely. Checking strace, I could see that it would just sit on an flock call on fish_variables. Took half a night to debug and figure out what the heck was going on. It would be nice if fish failed gracefully.
The other challenge was fish didn't provide any error message, even with --debug='complete,*history*' --init-command='set fish_trace on' options set.