segfault in rd_kafka_topic_metadata_update

[Luca Bellini (shade8881)]

I have a producer and consumer running, if I stop kafka (the entire cluster) and restart it after 1h, I have this crash

#0 0x00007f5407e164fb in rd_kafka_topic_metadata_update (rkt=rkt@entry=0x7f53e0001450, mdt=mdt@entry=0x7f53e0006f58, mdit=mdit@entry=0x7f53e0006f78, ts_age=) at rdkafka_
topic.c:1390
#1 0x00007f5407e1746d in rd_kafka_topic_metadata_update2 (rkb=rkb@entry=0x7f52a00a7780, mdt=mdt@entry=0x7f53e0006f58, mdit=mdit@entry=0x7f53e0006f78) at rdtime.h:106
#2 0x00007f5407eab209 in rd_kafka_parse_Metadata_update_topic (mdit=0x7f53e0006f78, mdt=0x7f53e0006f58, rkb=0x7f52a00a7780) at rdkafka_metadata.c:379
#3 rd_kafka_parse_Metadata0 (rkb=rkb@entry=0x7f52a00a7780, request=request@entry=0x7f52a0002590, rkbuf=rkbuf@entry=0x7f52a011de70, mdip=mdip@entry=0x7f529a5f51d8, request_topics=reques
t_topics@entry=0x0, reason=0x7f52a0004320 "connected") at rdkafka_metadata.c:839
#4 0x00007f5407eaf51f in rd_kafka_parse_Metadata (rkb=rkb@entry=0x7f52a00a7780, request=request@entry=0x7f52a0002590, rkbuf=rkbuf@entry=0x7f52a011de70, mdip=mdip@entry=0x7f529a5f51d8)
at rdkafka_metadata.c:1111
#5 0x00007f5407e2edc0 in rd_kafka_handle_Metadata (rk=, rkb=0x7f52a00a7780, err=, rkbuf=0x7f52a011de70, request=0x7f52a0002590, opaque=0x0) at rdkafka_req
uest.c:2546
#6 0x00007f5407e25904 in rd_kafka_buf_callback (rk=0x7f52a0049610, rkb=0x7f52a00a7780, err=RD_KAFKA_RESP_ERR_NO_ERROR, response=0x7f52a011de70, request=0x7f52a0002590) at rdkafka_buf.c
:509
#7 0x00007f5407e2c0d0 in rd_kafka_op_handle_std (rk=, rkq=, rko=, cb_type=) at rdkafka_op.c:905
#8 0x00007f5407e2c178 in rd_kafka_op_handle (rk=0x7f52a0049610, rkq=0x7f529a5f5410, rko=0x7f52a011da60, cb_type=RD_KAFKA_Q_CB_CALLBACK, opaque=0x7f52a0049610, callback=0x7f5407df4b20 <
rd_kafka_poll_cb>) at rdkafka_op.c:945
#9 0x00007f5407e28c31 in rd_kafka_q_serve (rkq=0x7f52a0004660, timeout_ms=, max_cnt=max_cnt@entry=0, cb_type=cb_type@entry=RD_KAFKA_Q_CB_CALLBACK, callback=callback@entr
y=0x0, opaque=opaque@entry=0x0) at rdkafka_queue.c:578
#10 0x00007f5407df7d4d in rd_kafka_thread_main (arg=arg@entry=0x7f52a0049610) at rdkafka.c:2143
#11 0x00007f5407ea1eb7 in _thrd_wrapper_function (aArg=) at tinycthread.c:576
#12 0x00007f5408f32ea5 in start_thread () from /lib64/libpthread.so.0
#13 0x00007f54009aab0d in clone () from /lib64/libc.so.6