panic: vm_fault: fault on nofault entry, addr: c33a3000 - r195941/BETA2

Hi,

got the following panic. Have been having this a few times quite randomly, 
since beta2. Finally with KDB_UNATTENDED got a core dump.

I can't really relate this to a workload. It happened once when machine was 
totally idle, this time there was a rather high workload from compiling kde4 
related ports in a jail with -j2.

FreeBSD smoochies.rachie.is-a-geek.net 8.0-BETA2 FreeBSD 8.0-BETA2 #9 
r195941M: Sun Aug  2 12:25:04 AKDT 2009     mel_at_smoochies.rachie.is-a-
geek.net:/usr/obj/usr/src/sys/HPDV9000  i386

panic: vm_fault: fault on nofault entry, addr: c33a3000

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Unread portion of the kernel message buffer:
panic: vm_fault: fault on nofault entry, addr: c33a3000
cpuid = 1
Uptime: 3d12h41m32s
Physical memory: 1517 MB
Dumping 257 MB: 242 226 210 194 178 162 146 130 114 98 82 66 50 34 18 2

(kgdb) bt
#0  doadump () at pcpu.h:246
#1  0xc064d0b7 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:419
#2  0xc064d3e2 in panic (fmt=Variable "fmt" is not available.
) at /usr/src/sys/kern/kern_shutdown.c:575
#3  0xc08216b7 in vm_fault (map=0xc1890000, vaddr=3275370496, fault_type=1 
'\001',
    fault_flags=0) at /usr/src/sys/vm/vm_fault.c:283
#4  0xc088540e in trap_pfault (frame=0xe7919a34, usermode=0, eva=3275370840)
    at /usr/src/sys/i386/i386/trap.c:835
#5  0xc0885e83 in trap (frame=0xe7919a34) at /usr/src/sys/i386/i386/trap.c:528
#6  0xc0868aab in calltrap () at /usr/src/sys/i386/i386/exception.s:165
#7  0xc0839a05 in vm_reserv_level_iffullpop (m=0xc776c5e8)
    at /usr/src/sys/vm/vm_reserv.c:512
#8  0xc0882ad0 in pmap_enter (pmap=0xc4d42450, va=750776320, access=2 '\002',
    m=0xc776c5e8, prot=3 '\003', wired=0) at 
/usr/src/sys/i386/i386/pmap.c:3226
#9  0xc0823095 in vm_fault (map=0xc4d423a0, vaddr=750776320, fault_type=2 
'\002',
    fault_flags=Variable "fault_flags" is not available.
) at /usr/src/sys/vm/vm_fault.c:933
#10 0xc088535b in trap_pfault (frame=0xe7919d38, usermode=1, eva=750776320)
    at /usr/src/sys/i386/i386/trap.c:823
#11 0xc0885cfe in trap (frame=0xe7919d38) at /usr/src/sys/i386/i386/trap.c:398
#12 0xc0868aab in calltrap () at /usr/src/sys/i386/i386/exception.s:165
#13 0x2832f530 in ?? ()
(kgdb) f 9
#9  0xc0823095 in vm_fault (map=0xc4d423a0, vaddr=750776320, fault_type=2 
'\002',
    fault_flags=Variable "fault_flags" is not available.
) at /usr/src/sys/vm/vm_fault.c:933
933             pmap_enter(fs.map->pmap, vaddr, fault_type, fs.m, prot, 
wired);
(kgdb) print *map
$1 = {header = {prev = 0xc59d15a0, next = 0xc59d1630, left = 0x0, right = 0x0, 
start = 0,
    end = 3217031168, avail_ssize = 0, adj_free = 0, max_free = 0, object = {
      vm_object = 0x0, sub_map = 0x0}, offset = 0, eflags = 0, protection = 0 
'\0',
    max_protection = 0 '\0', inheritance = 0 '\0', wired_count = 0, lastr = 0, 
uip = 0x0},
  lock = {lock_object = {lo_name = 0xc090395e "user map", lo_flags = 36896768,
      lo_data = 0, lo_witness = 0x0}, sx_lock = 17}, system_mtx = {lock_object 
= {
      lo_name = 0xc0903953 "system map", lo_flags = 21168128, lo_data = 0,
      lo_witness = 0x0}, mtx_lock = 4}, nentries = 154, size = 322252800,
  timestamp = 137335, needs_wakeup = 0 '\0', system_map = 0 '\0', flags = 0 
'\0',
  root = 0xcaab3d80, pmap = 0xc4d42450, deferred_freelist = 0x0}

Anything else anyone wants to see?
-- 
Mel