The panic below happened at 3AM, when the system was supposedly not
doing much. Looks pretty strange to me, does it make sense *at all*?

Also, wrt UBC (I'm guessing), I'm now noticing large interactive
performance lags while copying large files, which I hadn't seen with
1.5_BETA. Also, if I copy a large file (eg 114MB) while I have an
emacs up, even if I come back to the emacs just a few seconds after
the copy is done, there is a noticable delay before I can type
anything. This was not the case before. Is UBC maybe being too
agressive in its caching, to the detriment of swap for "active"
processes? Is there an easy way to tune this?

********************

(gdb) target kcore netbsd.2.core
panic: trap
#0  0xc041fe5b in i386_cpuid_cpus ()
(gdb) where
#0  0xc041fe5b in i386_cpuid_cpus ()
#1  0x4ff4000 in ?? ()
#2  0xc02d6c5f in cpu_reboot (howto=260, bootstr=0x0)
    at ../../../../arch/i386/i386/machdep.c:1371
#3  0xc01b79eb in panic () at ../../../../kern/subr_prf.c:240
#4  0xc02de7c5 in trap (frame={tf_es = 16, tf_ds = 16, tf_edi = 0, tf_esi = 0, 
      tf_ebp = -886489764, tf_ebx = -1064787836, tf_edx = -1068281292, 
      tf_ecx = -1068281344, tf_eax = -1064787836, tf_trapno = 6, tf_err = 2, 
      tf_eip = -1071610377, tf_cs = 8, tf_eflags = 66050, tf_esp = 0, 
      tf_ss = -886489660, tf_vm86_es = -1068605799, tf_vm86_ds = 7, 
      tf_vm86_fs = -1073741824, tf_vm86_gs = -1064787836})
    at ../../../../arch/i386/i386/trap.c:292
#5  0xc0100cb1 in calltrap ()
#6  0xc0214b06 in arplookup (addr=0xcb293dc4, create=0, proxy=0)
    at ../../../../netinet/if_arp.c:981
#7  0xc02145e0 in in_arpinput (m=0xc0978b00)
    at ../../../../netinet/if_arp.c:809
#8  0xc02142c7 in arpintr () at ../../../../netinet/if_arp.c:692
#9  0xc0101ccb in Xsoftnet ()
#10 0xc02d6c37 in cpu_reboot (howto=256, bootstr=0x0)
    at ../../../../arch/i386/i386/machdep.c:1358
#11 0xc01b79eb in panic () at ../../../../kern/subr_prf.c:240
#12 0xc02de7c5 in trap (frame={tf_es = 16, tf_ds = 16, tf_edi = 0, tf_esi = 0, 
      tf_ebp = -886489320, tf_ebx = -1064787836, tf_edx = -1068281292, 
      tf_ecx = -1068281344, tf_eax = -1064787836, tf_trapno = 6, tf_err = 2, 
      tf_eip = -1071610377, tf_cs = 8, tf_eflags = 66054, tf_esp = 0, 
      tf_ss = -886489216, tf_vm86_es = -1068605799, tf_vm86_ds = 7, 
      tf_vm86_fs = -1073741824, tf_vm86_gs = -1064787836})
    at ../../../../arch/i386/i386/trap.c:292
#13 0xc0100cb1 in calltrap ()
#14 0xc0214b06 in arplookup (addr=0xcb293f80, create=0, proxy=0)
    at ../../../../netinet/if_arp.c:981
#15 0xc02145e0 in in_arpinput (m=0xc0978100)
    at ../../../../netinet/if_arp.c:809
#16 0xc02142c7 in arpintr () at ../../../../netinet/if_arp.c:692
#17 0xc0101ccb in Xsoftnet ()
can not access 0x87fcd32e, invalid translation (invalid PDE)
can not access 0x87fcd32e, invalid translation (invalid PDE)
Cannot access memory at address 0x87fcd32e.