DF-2903 trigger image log — stock INVARIANTS kernel (before fix)
===============================================================

Command: vnconfig -c -v -S 512 vn0 /root/ontrack.img
Image:   ontrack.img (md5 970db9b3d6029f9a4ddc1654584be00b, 32768 bytes)
Kernel:  DragonFly 6.5-DEVELOPMENT #0 (stock INVARIANTS)
Result:  INSTANT PANIC; guest catatonic (ssh dead, vm.sh status: down)

login: panic: brelse: inappropriate B_PAGING or B_CLUSTER bp 0xfffff8004f3df690
cpuid = 2
Trace beginning at frame 0xfffff8008d1f4810
brelse() at brelse+0x7f2 0xffffffff806d3ed2
brelse() at brelse+0x7f2 0xffffffff806d3ed2
mbrinit() at mbrinit+0x1ae 0xffffffff80b96e8e
disk_probe() at disk_probe+0x85 0xffffffff80693785
disk_msg_core() at disk_msg_core+0x252 0xffffffff80693dc2
Debugger("panic")

CPU2 stopping CPUs: 0x0000003b
 stopped
Stopped at      Debugger+0x7c:  movb    $0,0xbdaf09(%rip)
db>