panic using VirtualBox on -current

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While installing a guest OS (Centos-5.3) under VirtualBox, I get a panic
as below. Any pointers as to how to proceed would be appreciated.

I have these defined in the kernel:

# Debugging for use in -current
options      KDB         # Enable kernel debugger support.
options      DDB         # Support DDB.
options      INVARIANTS  # Enable calls of extra sanity checking
options      INVARIANT_SUPPORT # Extra sanity checks
options      WITNESS     # Enable checks to detect deadlocks and cycles
nooptions       WITNESS_SKIPSPIN # Don't run witness on spinlocks

options      KDB_TRACE   # print a stack trace on panic
options      DEBUG_MEMGUARD # detect reads or writes
options      DIAGNOSTIC

	Michael

panic: uma: item 0xc7efa400 did not belong to zone 64

cpuid = 0
KDB: stack backtrace:
db_trace_self_wrapper(c0a94825,0,c0a85c81,e803fbb8,0,...) at
db_trace_self_wrapper+0x26
panic(c0a85c81,c7efa400,c0a7dc8d,c7efa400,c148b060,...) at panic+0x106
uma_dbg_free(c148b000,0,c7efa400,7c8,c0a58349,...) at uma_dbg_free
uma_zalloc_arg(c148b000,0,2,c0adae6c,2c,...) at uma_zalloc_arg+0x2b7
malloc(2c,c0adae6c,2,0,c0a58349,...) at malloc+0xa4
ioctl(c8f1b690,e803fcf8,c,c0a73dd2,c0ace5a8,...) at ioctl+0xeb
syscall(e803fd38) at syscall+0x19e
Xint0x80_syscall() at Xint0x80_syscall+0x20
- --- syscall (54, FreeBSD ELF32, ioctl), eip = 0x482a3d0b, esp =
0xbf8bad4c, ebp = 0xbf8bad68 ---
KDB: enter: panic
exclusive spin mutex allpmaps (allpmaps) r = 0 (0xc0ced570) locked _at_
/usr/home/imb/svn/head/sys/i386/i386/pmap.c:2461
exclusive lockmgr bufwait (bufwait) r = 0 (0xc52077f0) locked _at_
/usr/home/imb/svn/head/sys/kern/vfs_bio.c:1835
exclusive lockmgr ufs (ufs) r = 0 (0xc8edb9c4) locked _at_
/usr/home/imb/svn/head/sys/kern/vfs_vnops.c:607
exclusive sleep mutex 64 (UMA zone) r = 0 (0xc1494888) locked _at_
/usr/home/imb/svn/head/sys/vm/uma_core.c:1992
exclusive sx so_rcv_sx (so_rcv_sx) r = 0 (0xc8b18a34) locked _at_
/usr/home/imb/svn/head/sys/kern/uipc_sockbuf.c:148
exclusive sx so_rcv_sx (so_rcv_sx) r = 0 (0xc7dabbd0) locked _at_
/usr/home/imb/svn/head/sys/kern/uipc_sockbuf.c:148
exclusive sleep mutex PMAP2 (PMAP2) r = 0 (0xc0ceda44) locked _at_
/usr/home/imb/svn/head/sys/i386/i386/pmap.c:2411
exclusive sleep mutex vm page queue mutex (vm page queue mutex) r = 0
(0xc0ca4a84) locked _at_ /usr/home/imb/svn/head/sys/i386/i386/pmap.c:3635
exclusive sleep mutex pmap (pmap) r = 0 (0xc0ced4e0) locked _at_
/usr/home/imb/svn/head/sys/i386/i386/pmap.c:3629
exclusive sleep mutex system map (system map) r = 0 (0xc14900e8) locked
_at_ /usr/home/imb/svn/head/sys/vm/vm_map.c:2766
exclusive sleep mutex UMA lock (UMA lock) r = 0 (0xc0ca4304) locked _at_
/usr/home/imb/svn/head/sys/vm/uma_core.c:1565
exclusive spin mutex allpmaps (allpmaps) r = 0 (0xc0ced570) locked _at_
/usr/home/imb/svn/head/sys/i386/i386/pmap.c:2461
exclusive lockmgr bufwait (bufwait) r = 0 (0xc52077f0) locked _at_
/usr/home/imb/svn/head/sys/kern/vfs_bio.c:1835
exclusive lockmgr ufs (ufs) r = 0 (0xc8edb9c4) locked _at_
/usr/home/imb/svn/head/sys/kern/vfs_vnops.c:607
exclusive sleep mutex 64 (UMA zone) r = 0 (0xc1494888) locked _at_
/usr/home/imb/svn/head/sys/vm/uma_core.c:1992
exclusive sx so_rcv_sx (so_rcv_sx) r = 0 (0xc8b18a34) locked _at_
/usr/home/imb/svn/head/sys/kern/uipc_sockbuf.c:148
exclusive sx so_rcv_sx (so_rcv_sx) r = 0 (0xc7dabbd0) locked _at_
/usr/home/imb/svn/head/sys/kern/uipc_sockbuf.c:148
exclusive sleep mutex PMAP2 (PMAP2) r = 0 (0xc0ceda44) locked _at_
/usr/home/imb/svn/head/sys/i386/i386/pmap.c:2411
exclusive sleep mutex vm page queue mutex (vm page queue mutex) r = 0
(0xc0ca4a84) locked _at_ /usr/home/imb/svn/head/sys/i386/i386/pmap.c:3635
exclusive sleep mutex pmap (pmap) r = 0 (0xc0ced4e0) locked _at_
/usr/home/imb/svn/head/sys/i386/i386/pmap.c:3629
exclusive sleep mutex system map (system map) r = 0 (0xc14900e8) locked
_at_ /usr/home/imb/svn/head/sys/vm/vm_map.c:2766
exclusive sleep mutex UMA lock (UMA lock) r = 0 (0xc0ca4304) locked _at_
/usr/home/imb/svn/head/sys/vm/uma_core.c:1565
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