port-i386/51744: netbsd-7 i386 won't boot with DIAGNOSTIC & DEBUG

[htodd%emily.i8u.org@localhost]

>Number:         51744
>Category:       port-i386
>Synopsis:       netbsd-7 i386 won't boot with DIAGNOSTIC & DEBUG
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    port-i386-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Dec 26 05:50:00 +0000 2016
>Originator:     htodd%emily.i8u.org@localhost
>Release:        NetBSD 7.0_STABLE
>Organization:
	
>Environment:
	
	
System: NetBSD emily.i8u.org 7.0_STABLE NetBSD 7.0_STABLE (EMILY) #151: Wed Dec 21 06:43:44 PST 2016 htodd%emily.i8u.org@localhost:/usr/obj/i386/sys/arch/i386/compile/EMILY i386
Architecture: i386
Machine: i386
>Description:
Since npf dumps core under specific cases, I tried compiling with DIAGNOSTIC & DEBUG at rmind's request.

What I got was:
cpu0: Begin traceback...
vpanic(c050edc8,d9ecbbf8,d9ecbc1c,c03544e6,c050edc8,c1d9abe0,8,20,c03542c2,c187f200) at netbsd:vpanic+0x121
snprintf(c050edc8,c1d9abe0,8,20,c03542c2,c187f200,0,c1e54158,c1cf299c,c1d9f0f8) at netbsd:snprintf
kmem_intr_free(c1d9abe0,8,0,c1cf2998,10,10,8,c1cf299c,f,3152370) at netbsd:kmem_intr_free+0x21b
lpm_insert(c1cf2808,c1d644c4,4,20,c1ecaf40,ff,c0486f72,c1cc3360,c1d9f148,c1d644c4) at netbsd:lpm_insert+0x2c3
npf_table_insert(c1d9f148,4,c1d644c4,ff,c1db73fc,c1ec1794,ff000000,c1d9f148,c1b16860,c1d9fa58) at netbsd:npf_table_insert+0x1dd
npf_mk_table_entries(c1d9fa58,c1d9f148,2,0,0,c1ec7c40,c1db73d4,0,c1d64b24,0) at netbsd:npf_mk_table_entries+0x93
npf_mk_tables(3,c04fc132,d9ecbd4c,0,0,0,c1d9fa58,c02d8072,c18b2f00,3) at netbsd:npf_mk_tables+0x2d1
npfctl_load(c0084e66,d9ecbeb0,c0084e66,d9ecbeb0,1,c1d97d40,c600,c1e77218,c1cf6980,c1e77218) at netbsd:npfctl_load+0x1e6
spec_ioctl(d9ecbda0,c1ccd9d8,c1d97d40,c04cf3b0,c1e77218,c0084e66,d9ecbeb0,1,c18b2f00,c0084e66) at netbsd:spec_ioctl+0x91
VOP_IOCTL(c1e77218,c0084e66,d9ecbeb0,1,c18b2f00,bb759000,3e519000,3,22,3) at netbsd:VOP_IOCTL+0x3e
vn_ioctl(c1cf6980,c0084e66,d9ecbeb0,3,1000001,3,0,1,8,0) at netbsd:vn_ioctl+0x93
sys_ioctl(c1d97d40,d9ecbf68,d9ecbf60,bb759000,c1ccc5cc,c05b9b88,d9ecbf68,0,0,3) at netbsd:sys_ioctl+0x198
syscall() at netbsd:syscall+0x83
--- syscall (number 54) ---
bb8e6f87:
cpu0: End traceback...
	
>How-To-Repeat:
Compile kernel with DEBUG & DIAGNOSTIC and reboot.
	
>Fix:
Yes please.

>Unformatted: