This is on my build machine (laptop is still building its kernel), so
kernel here is GENERIC.  Copy/paste from serial console:

panic: Assertion tty_gone(tp) failed at /usr/src/sys/sys/ttydevsw.h:191
cpuid = 7
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe085de54430
vpanic() at vpanic+0x182/frame 0xfffffe085de544b0
kassert_panic() at kassert_panic+0x126/frame 0xfffffe085de54520
tty_drain() at tty_drain+0x80/frame 0xfffffe085de54560
ttydev_leave() at ttydev_leave+0x8d/frame 0xfffffe085de54580
ttydev_close() at ttydev_close+0xaf/frame 0xfffffe085de545a0
devfs_close() at devfs_close+0x223/frame 0xfffffe085de54610
VOP_CLOSE_APV() at VOP_CLOSE_APV+0xf1/frame 0xfffffe085de54640
vn_close() at vn_close+0xcd/frame 0xfffffe085de546b0
vn_closefile() at vn_closefile+0x4a/frame 0xfffffe085de54730
devfs_close_f() at devfs_close_f+0x2c/frame 0xfffffe085de54760
_fdrop() at _fdrop+0x1a/frame 0xfffffe085de54780
closef() at closef+0x1e1/frame 0xfffffe085de54810
fdescfree_fds() at fdescfree_fds+0x9d/frame 0xfffffe085de54850
fdescfree() at fdescfree+0x46c/frame 0xfffffe085de54910
exit1() at exit1+0x4e6/frame 0xfffffe085de54990
ys_sys_exit() at sys_sys_exit+0xd/frame 0xfffffe085de549a0
amd64_syscall() at amd64_syscall+0x2db/frame 0xfffffe085de54ab0
Xfast_syscall() at Xfast_syscall+0xfb/frame 0xfffffe085de54ab0
--- syscall (1, FreeBSD ELF64, sys_sys_exit), rip = 0x80090801a, rsp = 
0x7fffffffc248, rbp = 0x7fffffffc260 ---
KDB: enter: panic
[ thread pid 305 tid 100103 ]
Stopped at      kdb_enter+0x3b: movq    $0,kdb_why

/etc/src.conf includes 'WITH_FAST_DEPEND=1', and world & kernel were built
in-place while the system had been running @r294319, using -DNO_CLEAN.

I can probably get a crash dump; if so, I can make it available.  I am
also willing to poke at the debugger via serial console, given guidance.

David H. Wolfskill                    
Those who would murder in the name of God or prophet are blasphemous cowards.

See for my public key.

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