lib/59048: rump_nfs memfaults when ran as unprivileged user

[para%dismail.de@localhost]

>Number:         59048
>Category:       lib
>Synopsis:       rump_nfs memfaults when ran as unprivileged user
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    lib-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Feb 05 19:10:00 +0000 2025
>Originator:     para
>Release:        10.99.12
>Organization:
>Environment:
NetBSD barnard 10.99.12 NetBSD 10.99.12 (GENERIC) #0: Wed Feb  5 18:04:04 UTC 2025  para@barnard:/home/para/meta/obj/sys/arch/amd64/compile/GENERIC amd64
>Description:
When attempting to run 'rump_nfs' as an unprivileged user (with no write permissions to /dev/putter), the program memfaults.
>How-To-Repeat:
0. run rump_nfs remote:/dir mountpoint as unprivileged user
1. memfault :(
>Fix:
run sysctl -w vfs.generic.usermount=1
give your user write access to /dev/putter