Producer segfaults with request.required.acks=0

[mteodoro]

We recently updated our version of librdkafka and noticed that producers are segfaulting when request.required.acks is set to 0. I was able to reproduce this with rdkafka_example:

$ echo testdata | ./examples/rdkafka_example -P -t test -X topic.request.required.acks=0
Segmentation fault (core dumped)

It looks like rd_kafka_produce_reply_handle is being called with an NULL reply:

rd_kafka_produce_msgset_reply (rkb=0x7ffff0001ca0, err=RD_KAFKA_RESP_ERR_NO_ERROR, reply=0x0, 
    request=0x7fffe8000aa0, opaque=0x7ffff0002320) at rdkafka_broker.c:1584
1584                    err = rd_kafka_produce_reply_handle(rkb, reply);

Git bisect makes it look like this was introduced in a52f585.

librdkafka has been a pleasure to use so far, thanks for all the work!

[edenhill]

Thanks for reporting this!
It's now been fixed in master and a matching regression test has been implemented.

Glad to hear you are happy with rdkafka, let me know if you want to get added to the list of users in the README file.