I am running 2.0G on my Powerbook.  Occasionally it hangs when I run
reboot(8).  Here is a stack trace.  This is fairly representative
in that VOP_LOCK has always been implicated, but I had not seen
uvm_km_alloc_poolpage1 in any previous stack trace....

internal_command
wskbd_translate
wskbd_input
kbd_passup
kbd_intr
kbd_processevent
kbd_adbcomplete
adb_soft_inter
softclock
hardclock
decr_intr
trapstart
uvm_km_alloc_poolpage1
genfs_lock
VOP_LOCK
vn_lock
vget
checkalias
getdevvp
cdevvp
cnopen
spec_open
VOP_OPEN
vn_open
sys_open
syscall_plain
user SC trap #5 by 0x41894b38: srr1=0xd032
r1=0xffffcf80 cr=0x44044044 xer=0 ctr=0x41894b30
saved LR(0xfffffffb) is invalid.

Dave

-- 
David Young             OJC Technologies
dyoung@ojctech.com      Urbana, IL * (217) 278-3933