doing "shutdown(8) -p now" on my Toshiba notebook I got the following
last night. -current sources cvs(1)-ed yesterday evening (25. jan)
around 18:30 UTC, softdeps and this union-mount:
<above>:/wrk/lsrc       3039527  2994066    31664     99%    /wrk/src

panic: insmntque into dying filesystem

db> t
cpu_Debugger
panic
insmntque
getnewvnode
union_allocvp
union_root
union_umount
dounmount
vfs_unmountall
vfs_shutdown
cpu_reboot
sys_reboot
syscall_plain

transcribed manually, as inspecting the crash-dump yields:

GNU gdb 4.17
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welcome to change it and/or distribute copies of it under certain conditions.
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There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i386--netbsd".
(gdb) target netbsd.2
Undefined target command: "netbsd.2".  Try "help target".
(gdb) target exec netbsd.2
(gdb) target kcore netbsd.2.core
kernel symbol `panicstr' not found.
(gdb) where
can not access 0x4, invalid translation (invalid PTE)
can not access 0x4, invalid translation (invalid PTE)
Cannot read ebx, esi, and edi.
(gdb)


	Kurt