kern/53329: netboot over nfs broken

[prlw1%cam.ac.uk@localhost]

>Number:         53329
>Category:       kern
>Synopsis:       netboot over nfs broken
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue May 29 16:05:00 +0000 2018
>Originator:     Patrick Welche
>Release:        NetBSD-8.99.19/amd64
>Organization:
>Environment:
>Description:
Netbooting no longer works. Tried 2 new boxes (one last week with 8.99.17) and one today, so tried my known-to-have-netbooted-successfully-in-the-past laptop, and in all cases (alc0, wm0, wm0), "cannot mount root, error = 79".

The kernel is loaded and started over nfs, not tftp, so I believe that dhcpd and nfsd on a 8.99.19 server are working correctly.

What is new is:

nfs_boot: trying DHCP/BOOTP
nfs_boot: timeout...
nfs_boot: timeout...
nfs_boot: timeout...

The server sees at most 2 requests. One presumably is the successful dhcp request before tftp get pxeboot_ia32.bin.
>How-To-Repeat:

>Fix: