kern/56029: panic trap urtwn ieee80211_crypto_encap

[prlw1%cam.ac.uk@localhost]

>Number:         56029
>Category:       kern
>Synopsis:       panic trap urtwn ieee80211_crypto_encap
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Mar 01 10:50:01 +0000 2021
>Originator:     Patrick Welche
>Release:        Mar  1 202 1 08:43 src
>Organization:
>Environment:
NetBSD-9.99.80/amd64
if_urtwn.c,v 1.95
>Description:
Just started an scp transfer over urtwn0, when

sys_reboot() at sys_reboot
vpanic() at vpanic+0x154
snprintf() at snprintf
startlwp() at startlwp
calltrap() at calltrap+0x11
ccmp_encap() at ccmp_encap+0x13d
ieee80211_crypto_encap() at ieee80211_crypto_encap+0x13c
urtwn_tx() at urtwn_tx+0x381    = dev/usb/if_urtwn.c:2665
urtwn_start() at urtwn_start+0xc4
urtwn_txeof() at urtwn_txeof+0x74
usb_transfer_complete() at usb_transfer_complete+0x20c
xhci_softintr() at xhci_softintr+0x4c6
usb_soft_intr() at usb_soft_intr+0x1f
softint_dispatch() at softint_dispatch+0x85
crash: _kvm_kvatop(ffff8c013c49f0b8)
crash: kvm_read(0xffff8c013c49f0b8, 8): invalid translation (invalid PTE)

I have a core dump & symbols, but Feb 6th's gdb is unhappy with it...
>How-To-Repeat:

>Fix: