9.0-STABLE crash

[Mike Pumford <mpumford%mudcovered.org.uk@localhost>]

Got this kernel panic while doing an unattented pkgsrc build. Sadly the 
dump is corrupt so I don't have the kernel crashdump to poke around in.

[ 133522.766252] uvm_fault(0xffffc5c4f4a49730, 0x0, 2) -> e
[ 133522.766252] fatal page fault in supervisor mode
[ 133522.766252] trap type 6 code 0x2 rip 0xffffffff80227d4c cs 0x8 
rflags 0x10246 cr2 0x50 ilevel 0x8 rsp 0xffff8b8140a32258
[ 133522.766252] curlwp 0xffffc5c5381d6760 pid 14643.7 lowest kstack 
0xffff8b8140a302c0
[ 133522.766252] panic: trap
[ 133522.766252] cpu6: Begin traceback...
[ 133522.766252] vpanic() at netbsd:vpanic+0x160
[ 133522.766252] snprintf() at netbsd:snprintf
[ 133522.766252] startlwp() at netbsd:startlwp
[ 133522.766252] alltraps() at netbsd:alltraps+0xbb
[ 133522.766252] nvme_ns_dobio() at netbsd:nvme_ns_dobio+0xa2
[ 133522.766252] ld_nvme_start() at netbsd:ld_nvme_start+0x6e
[ 133522.766252] ld_diskstart() at netbsd:ld_diskstart+0x7d
[ 133522.766252] dk_start() at netbsd:dk_start+0x102
[ 133522.766252] spec_strategy() at netbsd:spec_strategy+0xa7
[ 133522.766252] VOP_STRATEGY() at netbsd:VOP_STRATEGY+0x6c
[ 133522.766252] dkstart() at netbsd:dkstart+0x184
[ 133522.776256] spec_strategy() at netbsd:spec_strategy+0xa7
[ 133522.776256] VOP_STRATEGY() at netbsd:VOP_STRATEGY+0x6c
[ 133522.776256] genfs_do_io() at netbsd:genfs_do_io+0x18b
[ 133522.776256] genfs_gop_write() at netbsd:genfs_gop_write+0x52
[ 133522.776256] genfs_do_putpages() at netbsd:genfs_do_putpages+0xbf7
[ 133522.776256] VOP_PUTPAGES() at netbsd:VOP_PUTPAGES+0x53
[ 133522.776256] ffs_write() at netbsd:ffs_write+0x258
[ 133522.776256] VOP_WRITE() at netbsd:VOP_WRITE+0x50
[ 133522.776256] vn_rdwr() at netbsd:vn_rdwr+0xd9
[ 133522.776256] coredump_write() at netbsd:coredump_write+0x56
[ 133522.776256] coredump_elf32() at netbsd:coredump_elf32+0x6ea
[ 133522.776256] coredump() at netbsd:coredump+0x58a
[ 133522.776256] sigexit() at netbsd:sigexit+0x2f4
[ 133522.776256] sendsig() at netbsd:sendsig
[ 133522.776256] lwp_userret() at netbsd:lwp_userret+0x149
[ 133522.776256] netbsd32_syscall() at netbsd:netbsd32_syscall+-0x1f13d3
[ 133522.776256] cpu6: End traceback...
[ 133522.776256] uvm_fault(0xffffc5c65df71a38, 0x0, 2) -> e
[ 133522.776256] fatal page fault in supervisor mode
[ 133522.776256] trap type 6 code 0x2 rip 0xffffffff80957bd8 cs 0x8 
rflags 0x10246 cr2 0x84 ilevel 0x8 rsp 0xffff8b813d79abe0
[ 133522.776256] curlwp 0xffffc5c603568760 pid 9885.1 lowest kstack 
0xffff8b813d7982c0

[ 133522.776256] dumping to dev 168,2 (offset=33809639, size=4162403):
[ 133522.776256] dump [   1.0000000] Copyright (c) 1996, 1997, 1998, 
1999, 2000, 2001, 2002, 2003, 2004, 2005,

The dump is so corrupt I can't even clear it. I get:
# savecore -c
savecore: /dev/rdk2: kvm_dump_inval: invalid translation (invalid level 
3 PDE)