integer divide by zero panic in kern_synch.c

["Simon 'corecode' Schubert" <corecode@xxxxxxxxxxxx>]

hey,

i recently got an integer divide by zero panic at:
#19 0xc01a08a8 in updatepcpu (lp=0xc2bb4794, cpticks=0, ttlticks=0)
    at /usr/src/sys/kern/kern_synch.c:249
249             acc = (cpticks << FSHIFT) / ttlticks;

it's a 1.4-release box (though kernel is from january) which does 
nothing but pf/bridge

kernel dump available upon request

cheers
  simon

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