port-evbarm/58827: 10.0 on RPI 0W, bwfm appears to hang

[d.hutchinson%live.com@localhost]

>Number:         58827
>Category:       port-evbarm
>Synopsis:       10.0 on RPI 0W, bwfm appears to hang
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-evbarm-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Nov 14 21:35:00 +0000 2024
>Originator:     David Hutchinson
>Release:        NetBSD 10.0 earmv6hf
>Organization:
>Environment:
NetBSD reddwarf.parhelia 10.0 NetBSD 10.0 (RPI) #0: Thu Mar 28 08:33:33 UTC 2024  mkrepro%mkrepro.NetBSD.org@localhost:/usr/src/sys/arch/evbarm/compile/RPI evbarm

>Description:
Large file transfers appear to cause networking to hang. Small transfers such as remote shells or serving dokuwiki pages via nginx don't appear to cause problems, but using wget to download a large file or installing a large remote package via pkgin causes all networking to cease after a few seconds. Sometimes the speed declines, sometimes it it stops immediately.

Once this happens, software such as ping or ssh just hangs when invoked. They they can be killed via ^C or ^D. Attemps to connect to the RPI0W from remote hosts gives a "No Route to host" error. The RPI doesn't respond to pings.

Every once in a while it will successfully download a large file without crashing.

When it fails, no messages are printed to the console or output via dmesg
>How-To-Repeat:
ftp https://cdn.netbsd.org/pub/NetBSD/NetBSD-10.0/evbarm-earmv6hf/binary/sets/base.tgz
>Fix: