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Panic in mem_poison_check on,shutdown

Hi -
I'm getting a panic in kmem_poison_check on

It was first noticed with a shutdown -p on command line of domU.
But also occurs with  shutdown of dom0.

System is running:
NetBSD udp.ir.bbn.com 4.99.64 NetBSD 4.99.64 (XEN3_DOM0) #2: Tue Jun 10 21:11:09 EDT 2008 gdt%fnord.ir.bbn.com@localhost:/n0/obj/gdt-current/amd64/sys/arch/amd64/compile/XEN3_DOM0 amd64

shutdown -p now  returns :

Jun 11 14:06:43 shutdown: reboot by root:

System shutdown time has arrived

About to run shutdown hooks...
Stopping cron.
Stopping inetd.
Waiting for PIDS: 260.
Removing block-type swap devices
swapctl: removing /dev/xbd0b as swap device
Wed Jun 11 14:06:48 EDT 2008

Done running shutdown hooks.
Jun 11 14:06:53  syslogd: Exiting on signal 15
panic: kmem_poison_check: 0xffffa0000f4726a8: 0xa3 != 0xa4

fatal breakpoint trap in supervisor mode
trap type 1 code 0 rip ffffffff80363535 cs e030 rflags 246 cr2 7f7ffd983b70 cpl 0 rsp ffffa0000f4768b0
Stopped in pid 152.1 (mount_mfs) at     netbsd:breakpoint+0x5:  leave
breakpoint() at netbsd:breakpoint+0x5
panic() at netbsd:panic+0x255
kmem_poison_check() at netbsd:kmem_poison_check+0x82
kmem_backend_free() at netbsd:kmem_backend_free+0x3d
amap_free() at netbsd:amap_free+0x64
uvm_unmap_detach() at netbsd:uvm_unmap_detach+0x4f
uvmspace_free() at netbsd:uvmspace_free+0x11d
exit1() at netbsd:exit1+0x215
sigexit() at netbsd:sigexit+0x183
postsig() at netbsd:postsig+0x120
lwp_userret() at netbsd:lwp_userret+0x129
syscall() at netbsd:syscall+0x128
ds          0x68c0
es          0xe02b
fs          0x6870
gs          0x203
rdi         0
rsi         0xd
rbp         0xffffa0000f4768b0
rbx         0xffffa0000f4768c0
rdx         0
rcx         0
rax         0x1
r8          0xffffffff80577900  cpu_info_primary
r9          0x1
r10         0xffffa0000f4767d0
r11         0xffffffff8037ae40  xenconscn_putc
r12         0x100
r13         0xffffffff803eb05e  copyright+0xcb1e
r14         0xffffa0000f1d7040
r15         0
rip         0xffffffff80363535  breakpoint+0x5
cs          0xe030
rflags      0x246
rsp         0xffffa0000f4768b0
ss          0xe02b
netbsd:breakpoint+0x5:  leave

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