locking error using today's sources

[David Hopper <dhop%nwlink.com@localhost>]

I just got this using today's kernel+userland during a pkgsrc Rust compilation while updating Firefox (pkgsrc also today's).  System is a ThinkPad P53, i9 9880H and 48GB RAM:

[ 8734.5350365] panic: kernel diagnostic assertion "l->l_refcnt != 0" failed: file "/usr/src/sys/kern/kern_lwp.c", line 1701
[ 8734.5350365] cpu2: begin traceback...
[ 8734.5350365] vpanic() at netbsd:vpanic+0x178
[ 8734.5350365] kern_assert() at netbsd:kern_assert+0x48
[ 8734.5350365] lwp_addref() at netbsd:lwp_addref+0xbc
[ 8734.5350365] procfs_rw() at netbsd:procfs_rw+0xeb
[ 8734.5350365] VOP_READ() at netbsd:VOP_READ+0x53
[ 8734.5350365] vn_read() at netbsd:vn_read+0x88
[ 8734.5350365] dofileread() at netbsd:dofileread+0x8c
[ 8734.5350365] sys_read() at netbsd:sys_read+0x49
[ 8734.5350365] syscall() at netbsd:syscall+0x299
[ 8734.5350365] --- syscall (number 3) ---
[ 8734.5350365] 7519d7a42baa:
[ 8734.5350365] cpu2: End traceback...
[ 8734.5350365] Mutex error: mutex_vector_enter,542: locking against myself
[ 8734.5350365] lock address : 0xffffced93d804b00
[ 8734.5350365] current cpu  :                  2
[ 8734.5350365] current lwp  : 0xffffced7c1ce42c0
[ 8734.5350365] owner field  : 0xffffced7c1ce42c0 wait/spin:                0/0
[ 8734.5350365] Skipping crash dump on recursive panic
[ 8734.5350365] panic: lock error: Mutex: mutex_vector_enter,542: locking against myself: lock 0xffffced93d804b00 cpu 2 lwp 0xffffced7c1ce42c0
[ 8734.5350365] cpu2: Begin traceback...
[ 8734.5350365] vpanic() at netbsd:vpanic+0x178
[ 8734.5350365] snprintf() at netbsd:snprintf
[ 8734.5350620] lockdebug_abort() at netbsd:lockdebug_abort+0xe6
[ 8734.5350620] mutex_vector_enter() at netbsd:mutex_vector_enter+0x3c1
[ 8734.5350620] suspendsched() at netbsd:suspendsched+0xf5
[ 8734.5350620] cpu_reboot() at netbsd:cpu_reboot+0x46
[ 8734.5350620] sys_reboot() at netbsd:sys_reboot
[ 8734.5350620] vpanic() at netbsd:vpanic+0x181
[ 8734.5350620] kern_assert() at netbsd:kern_assert+0x48
[ 8734.5350620] lwp_addref() at netbsd:lwp_addref+0xbc
[ 8734.5350620] procfs_rw() at netbsd:procfs_rw+0xeb
[ 8734.5350620] VOP_READ() at netbsd:VOP_READ+0x53
[ 8734.5350620] vn_read() at netbsd:vn_read+0x88
[ 8734.5350620] dofileread() at netbsd:dofileread+0x8c
[ 8734.5350620] sys_read() at netbsd:sys_read+0x49
[ 8734.5350620] syscall() at netbsd:syscall+0x299
[ 8734.5350620] --- syscall (number 3) ---
[ 8734.5350620] 7519d7a42baa:
[ 8734.5350620] cpu2: End traceback...

Let me know if there's anything else needed.
David