geventreactor: fix close() race causing EBADF errors#701
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GeventConnection.close() uses kill(block=False) which schedules GreenletExit for the next yield point, then closes the socket immediately. If close() is called from a non-gevent thread, the greenlet may still be mid-I/O when the socket is closed, causing EBADF. - Add is_closed/is_defunct guards in handle_read() and handle_write() error paths to silently exit during shutdown - Add GreenletExit exception handling in both I/O handlers for graceful greenlet termination (matching eventletreactor pattern) - Set last_error in close() when connected_event is not yet set to prevent factory() from returning a dead connection - Set last_error on server-initiated close (EOF) in handle_read()
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Summary
Fixes a race condition in
GeventConnectionwhereclose()could cause[Errno 9] Bad file descriptorerrors during node-down events.Root cause:
close()callskill(block=False)which schedulesGreenletExitfor the next yield point, then immediately closes the socket. If the greenlet is still mid-I/O when the socket is closed, the read/write handlers raise EBADF instead of shutting down gracefully.Changes:
GreenletExitinhandle_read()andhandle_write()to exit cleanly (matchingeventletreactorpattern)last_errorinclose()whenconnected_eventis not yet set, so connection attempts get a proper errorlast_erroron server-initiated close (EOF) inhandle_read()Fixes #614