netbsd-5-rc1 crash in pmap_enter

[6bone%6bone.informatik.uni-leipzig.de@localhost]

Hello list,

I am using an actual version of NetBSD 5.0_RC1 (amd). The kernel sometimes 
crashes with:

panic: pmap_enter: pve allocation failed
fatal breakpoint trap in supervisor mode
trap type 1 code 0 rip ffffffff8051ecb5 cs 8 rflags 246 cr2  7f7ffd216104 
cpl 00
Stopped in pid 396.1 (postgres) at      netbsd:breakpoint+0x5:  leave
db{0}> trace
breakpoint() at netbsd:breakpoint+0x5
panic() at netbsd:panic+0x24d
pmap_enter() at netbsd:pmap_enter+0xc52
genfs_directio() at netbsd:genfs_directio+0x237
ffs_write() at netbsd:ffs_write+0x8d1
VOP_WRITE() at netbsd:VOP_WRITE+0x66
vn_write() at netbsd:vn_write+0xce
dofilewrite() at netbsd:dofilewrite+0x81
sys_write() at netbsd:sys_write+0x72
syscall() at netbsd:syscall+0xb6
db{0}> show register
ds          0xe770
es          0x10
fs          0xe720
gs          0x3
rdi         0
rsi         0x3f8
rbp         0xffff8000723ce760
rbx         0xffff8000723ce770
rdx         0x8
rcx         0
rax         0x1
r8          0xffffffff809f199a  copyright+0x88f3a
r9          0x1
r10         0xffff8000723ce660
r11         0x8
r12         0x104
r13         0xffffffff809bfc10  copyright+0x571b0
r14         0xffff800081e30000
r15         0xb9420
rip         0xffffffff8051ecb5  breakpoint+0x5
cs          0x8
rflags      0x246
rsp         0xffff8000723ce760
ss          0x10
netbsd:breakpoint+0x5:  leave
db{0}> continue

dump to dev 4,1 not possible
rebooting...



Can anyone have a look at the code?

Thank you for your efforts.

Regards
Uwe