pf_purge_thread() breaks up the work of iterating all states (in pf_purge_expired_states()) and tracks progress in the idx variable. If multiple vnets exist this results in pf_purge_thread() only calling pf_purge_expired_states() for part of the states (the first part of the first vnet, second part of the second vnet and so on). Combined with the mark-and-sweep approach to cleaning up old rules (in V_pf_unlinked_rules) that resulted in pf freeing rules that were still referenced by states. This in turn caused panics when pf_state_expires() encounters that state and attempts to access the rule. We need to track the progress per vnet, not globally, so idx is moved into a per-vnet V_pf_purge_idx. PR: 219251 Sponsored by: Hackathon Essen 2017 |
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