Panic / wedge from bridging tap and vlan

[John Klos <john%klos.com@localhost>]

Hi, all,

I may've written about this before, but in case I didn't, I just set up a 
bridge between a tap interface which is used by tinc (pkgsrc/net/tinc) and 
a vlan.

It worked, but the moment I tried to use it, the machine became 
unresponsive. I couldn't enter the kernel debugger because of USB 
keyboard, but I got some info after reboot:

...
Starting virecover.
Checking for core dump...
savecore: check_kmem:429: kum_read msgbuf: _kvm_kvatop(ffffa50855d24000)
Feb 2 23:03:19 sage savecore: reboot after panic: lock error: Mutex: 
nutex_vector_ente r.548: locking against nyself: lock Oxffffd152aab57080 
cpu 0 lup 0xffffd152a9aeb480 savecore: reboot after panic: lock error: 
Mutex: mutex_vector_enter ,548: locking agains t myself: lock 
Oxffffd152aab57080 cpu 0 lup 0xffffd152a9aeb480
savecore: system went doun at Sun Feb 2 22:40:05 2025 savecore: uriting 
compressed core to /var/crash/netbsd.1.core.gz

(phone OCR isn't great)

Either this shouldn't happen, which is to say that bridging to a vlan 
should work, or this shouldn't be allowed, I'd think.

NetBSD 10.1, amd64.

Thoughts?

John