Daniel-Constantin Mierla writes:
in this particular case, it crashed because the ctx parameter is null for rpc_add() and fix_delayed_reply_ctx() functions as noted in frame 1 and 0.
the parameter was null because i had used <= 0 for testing invalid pua_send_publish result whereas the test should have been < 0. that caused rpc->delayed_ctx_close(dctx) being run on dctx.
i'll keep going further.
-- juha