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usb panic

Trying to fathom what is wrong with cdce0, I ran windows 10 on a laptop
with a USB-C dongle which has VGA/HDMI/USB-A and a cdce0 network port.
With windows 10, it successfully got a dhcp lease from a NetBSD dhcpd.
In NetBSD-current/amd64 from this morning, tcpdump on the laptop only
shows the discover requests and no incoming traffic. tcpdump on the dhcp
server shows the discover requests and the offers.

I then plugged in a run0 usb wifi dongle to get some sort of networking
going and

(gdb) target kvm netbsd.5.core
0xffffffff80222b05 in cpu_reboot (howto=howto@entry=260, 
    bootstr=bootstr@entry=0x0) at ../../../../arch/amd64/amd64/machdep.c:713
713                     dumpsys();
(gdb) bt
#0  0xffffffff80222b05 in cpu_reboot (howto=howto@entry=260, 
    bootstr=bootstr@entry=0x0) at ../../../../arch/amd64/amd64/machdep.c:713
#1  0xffffffff806f9d7a in kern_reboot (howto=howto@entry=260, 
    bootstr=bootstr@entry=0x0) at ../../../../kern/kern_reboot.c:73
#2  0xffffffff807291cf in vpanic (fmt=fmt@entry=0xffffffff80b33b60 "trap", 
    ap=ap@entry=0xffffd1013c7e3c38) at ../../../../kern/subr_prf.c:290
#3  0xffffffff80729293 in panic (fmt=fmt@entry=0xffffffff80b33b60 "trap")
    at ../../../../kern/subr_prf.c:209
#4  0xffffffff802248fd in trap (frame=0xffffd1013c7e3d80)
    at ../../../../arch/amd64/amd64/trap.c:326
#5  0xffffffff8021dae5 in alltraps ()
#6  0xffffffff8082ac20 in ?? () at ../../../../kern/init_main.c:1159
#7  0xffffffff8034b416 in run_task (arg=0xffffd1001f279000)
    at ../../../../dev/usb/if_run.c:1796
#8  0xffffffff802ef1a3 in usb_task_thread (
    arg=0xffffffff80e66c00 <usb_taskq+64>) at ../../../../dev/usb/usb.c:692
#9  0xffffffff802086f7 in lwp_trampoline ()
#10 0x0000000000000000 in ?? ()

Rebooting, I am writing this with the run0 working OK.

Any thoughts about no received packets on cdce0?

I'm not sure how repeatable the panic is.



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