After upgrading to 1.6 on an HP Netserver, I'm seeing a lot of these
(the perl is irrelevant, seems to be in syscall_plain each time):

netbsd$ NMI ... going to debugger
Stopped in pid 219 (perl) at    i386_copyin+0x3b:       repe movsl
(%esi),%
es:(%edi)
db> tr
i386_copyin(e374f000,2000,e3cd1ee0,2,e3cd1e7c) at i386_copyin+0x3b
ffs_write(e3cd1e7c,20002,0,1f4,e3cd1f80) at ffs_write+0x609
vn_write(e37c6750,e37c6778,e3cd1ee0,c14aa480,1) at vn_write+0xee
dofilewrite(e3cc156c,6,e37c6750,8348000,2000) at dofilewrite+0x9b
sys_write(e3cc156c,e3cd1f80,e3cd1f78,c13d4038) at sys_write+0x46
syscall_plain(bfbf001f,1f,822001f,bfbf001f,8348000) at
syscall_plain+0xa7
db> cont
netbsd$ 
netbsd$ mount
/dev/sd0a on / type ffs (local)
/dev/sd0e on /usr type ffs (local)
/dev/sd0f on /data type ffs (local)
/dev/sd1a on /data1 type ffs (local)
kernfs on /kern type kernfs (local)
uvm_fault(0xc0649100, 0x8000, 0, 2) -> e
kernel: page fault trap, code=0
Stopped in pid 7 (reaper) at    pmap_remove_ptes+0x143: orb     %bl,
   0(%
eax,%edx,1)
db> 


-- 
Chris