kern/54673: /etc/daily skipping NFS mounts does not work when NFS server is dead

[martin%NetBSD.org@localhost]

>Number:         54673
>Category:       kern
>Synopsis:       /etc/daily skipping NFS mounts does not work when NFS server is dead
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Nov 03 08:30:00 +0000 2019
>Originator:     Martin Husemann
>Release:        NetBSD 9.99.17
>Organization:
The NetBSD Foundation, Inc.
>Environment:
System: NetBSD painkiller.duskware.de 9.99.17 NetBSD 9.99.17 (GENERIC64) #85: Tue Oct 29 14:45:49 CET 2019 martin%seven-days-to-the-wolves.aprisoft.de@localhost:/work/src/sys/arch/evbarm/compile/GENERIC64 evbarm
Architecture: aarch64
Machine: evbarm
>Description:

The /etc/daily script, when looking for core dumps, tries to skip various
file system types, including NFS.

This works fine for NFS when the NFS server is alive, but hangs (untill the
server is back) when the NFS server is not responsive.

>How-To-Repeat:

mkdir -p test/src
mount $nfsserver:/usr/src test/src
find test -type d \! -fstype local -prune

this part works. Now: make the NFS server go away and retry the find.
It will hang untill the NFS mount is alive again.

>Fix:
n/a