panic in pf_purge_expired_states

[Simon 'corecode' Schubert]

hey,

about every month i'm getting a panic in pf_purge_expired_states on some 
RB_* function.

I talked to dhartmei and he said that there are no problems known to 
this code, except for reentrancy issues.

So I wonder: how can the RB-tree be destroyed?  Probably some race 
between the timer and the network.  But can that be?  The timer runs in 
a critical section, and shouldn't the network too?

several crash dumps available on request.

and clues?

thanks
  simon
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