Fresh 7.0 Install: Fatal Trap 12 panic when put under load

[john at basicnets.co.uk]

   > Please collect kgdb/ddb backtraces.

   kgdb backtrace:

   server251# kgdb -c /var/crash/vmcore.0
kgdb: couldn't find a suitable kernel image
server251# kgdb /boot/kernel/kernel /var/crash/vmcore.0
kgdb: kvm_read: invalid address (0xffffff00010e5468)
[GDB will not be able to debug user-mode threads:  
/usr/lib/libthread_db.so: Unde
fined symbol "ps_pglobal_lookup"]
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This GDB was configured as "amd64-marcel-freebsd".

   Unread portion of the kernel message buffer:

Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address   = 0x6400000000
fault code              = supervisor read instruction, page not present
instruction pointer     = 0x8:0x6400000000
stack pointer           = 0x10:0xffffffffb1d7f590
frame pointer           = 0x10:0xffffff0035d2dcc0
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 88622 (make)
trap number             = 12
panic: page fault
cpuid = 0
Uptime: 5h57m22s
Physical memory: 4082 MB
Dumping 444 MB: 429 413 397 381 365 349 333 317 301 285 269 253 237  
221 205 189
173 157 141 125 109 93 77 61 45 29 13

   #0  doadump () at pcpu.h:194
194     pcpu.h: No such file or directory.
        in pcpu.h
(kgdb)
(kgdb) list *0x6400000000
No source file for address 0x6400000000.
(kgdb) backtrace
#0  doadump () at pcpu.h:194
#1  0xffffff0004742440 in ?? ()
#2  0xffffffff80477699 in boot (howto=260)
    at /usr/src/sys/kern/kern_shutdown.c:409
#3  0xffffffff80477a9d in panic (fmt=0x104 <Address 0x104 out of bounds>)
    at /usr/src/sys/kern/kern_shutdown.c:563
#4  0xffffffff8072ed44 in trap_fatal (frame=0xffffff00048ee000,
    eva=18446742974275512528) at /usr/src/sys/amd64/amd64/trap.c:724
#5  0xffffffff8072f115 in trap_pfault (frame=0xffffffffb1d7f4e0, usermode=0)
    at /usr/src/sys/amd64/amd64/trap.c:641
#6  0xffffffff8072fa58 in trap (frame=0xffffffffb1d7f4e0)
    at /usr/src/sys/amd64/amd64/trap.c:410
#7  0xffffffff807156be in calltrap ()
    at /usr/src/sys/amd64/amd64/exception.S:169
#8  0x0000006400000000 in ?? ()
#9  0xffffffff8067d3ee in uma_zalloc_arg (zone=0xffffff00bfed07e0, udata=0x0,
    flags=-256) at /usr/src/sys/vm/uma_core.c:1835
#10 0xffffffff80661ecf in ffs_vget (mp=0xffffff00047f4978, ino=47884512,
    flags=2, vpp=0xffffffffb1d7f728) at uma.h:277
#11 0xffffffff8066d010 in ufs_lookup (ap=0xffffffffb1d7f780)
    at /usr/src/sys/ufs/ufs/ufs_lookup.c:573
#12 0xffffffff804dfa89 in vfs_cache_lookup (ap=Variable "ap" is not available.
) at vnode_if.h:83
#13 0xffffffff8077235f in VOP_LOOKUP_APV (vop=0xffffffff809e7de0,
    a=0xffffffffb1d7f840) at vnode_if.c:99
---Type <return> to continue, or q <return> to quit---
#14 0xffffffff804e6394 in lookup (ndp=0xffffffffb1d7f950) at vnode_if.h:57
#15 0xffffffff804e7228 in namei (ndp=0xffffffffb1d7f950)
    at /usr/src/sys/kern/vfs_lookup.c:219
#16 0xffffffff804f4717 in kern_stat (td=0xffffff00048ee000,
    path=0x8006f7040 <Address 0x8006f7040 out of bounds>,  
pathseg=Variable "path
seg" is not available.
)
    at /usr/src/sys/kern/vfs_syscalls.c:2109
#17 0xffffffff804f4987 in stat (td=Variable "td" is not available.
) at /usr/src/sys/kern/vfs_syscalls.c:2093
#18 0xffffffff8072f397 in syscall (frame=0xffffffffb1d7fc70)
    at /usr/src/sys/amd64/amd64/trap.c:852
#19 0xffffffff807158cb in Xfast_syscall ()
    at /usr/src/sys/amd64/amd64/exception.S:290
#20 0x000000000043127c in ?? ()
Previous frame inner to this frame (corrupt stack?)

   I really don't understand this -any advice you can give would  
really be appreciated.

   John

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