Commits on Jul 29, 2020

1. erl_check_io: do not discard ERTS_POLL_EV_IN from active_events …

   This commit fixes a race condition, which can be reproduced
   with running a large amount of bidirectional TCP streams.
   When the system is fully loaded, it is possible that socket migrated
   to scheduler pollset still fires EPOLLIN event. In this case
   active_events field of ErtsDrvEventState structure will desynchronise
   from the actual state (with EPOLLIN requested via scheduler pollset).
   This, in turn, leads to all ERTS_POLL_EV_IN events disregarded. All
   reads from the socket will be stopped.
   This can only happen for {active, N} mode of a TCP socket, where
   fd migrates back and forth to/from scheduler pollset.

   

   max-au committed Jul 29, 2020
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