[RFC] Fix possible data-race for statistics #4630
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TSan report (founded by ClickHouse CI):
Exception: Sanitizer assert found for instance �==================
WARNING: ThreadSanitizer: data race (pid=1)
Read of size 8 at 0x7b7800127158 by thread T987 (mutexes: read M0, write M1, write M2):
#0 __tsan_memcpy <null> (clickhouse+0x74eebb7) (BuildId: 7122171f6a93acda7ea89a6d10cce3ad580a715d)
confluentinc#1 rd_avg_rollover build_docker/./contrib/librdkafka/src/rdavg.h:153:22 (clickhouse+0x1e39753b) (BuildId: 7122171f6a93acda7ea89a6d10cce3ad580a715d)
confluentinc#2 rd_kafka_stats_emit_avg build_docker/./contrib/librdkafka/src/rdkafka.c:1354:9 (clickhouse+0x1e39753b)
confluentinc#3 rd_kafka_stats_emit_all build_docker/./contrib/librdkafka/src/rdkafka.c:1717:17 (clickhouse+0x1e395c8b) (BuildId: 7122171f6a93acda7ea89a6d10cce3ad580a715d)
confluentinc#4 rd_kafka_stats_emit_tmr_cb build_docker/./contrib/librdkafka/src/rdkafka.c:1898:2 (clickhouse+0x1e395c8b)
confluentinc#5 rd_kafka_timers_run build_docker/./contrib/librdkafka/src/rdkafka_timer.c:288:4 (clickhouse+0x1e46498a) (BuildId: 7122171f6a93acda7ea89a6d10cce3ad580a715d)
confluentinc#6 rd_kafka_thread_main build_docker/./contrib/librdkafka/src/rdkafka.c:2021:3 (clickhouse+0x1e3919e9) (BuildId: 7122171f6a93acda7ea89a6d10cce3ad580a715d)
confluentinc#7 _thrd_wrapper_function build_docker/./contrib/librdkafka/src/tinycthread.c:576:9 (clickhouse+0x1e47a57b) (BuildId: 7122171f6a93acda7ea89a6d10cce3ad580a715d)
Previous write of size 8 at 0x7b7800127158 by thread T986:
#0 rd_avg_calc build_docker/./contrib/librdkafka/src/rdavg.h:104:38 (clickhouse+0x1e37d71d) (BuildId: 7122171f6a93acda7ea89a6d10cce3ad580a715d)
confluentinc#1 rd_kafka_broker_timeout_scan build_docker/./contrib/librdkafka/src/rdkafka_broker.c:880:25 (clickhouse+0x1e37d71d)
confluentinc#2 rd_kafka_broker_ops_io_serve build_docker/./contrib/librdkafka/src/rdkafka_broker.c:3416:17 (clickhouse+0x1e37d71d)
confluentinc#3 rd_kafka_broker_consumer_serve build_docker/./contrib/librdkafka/src/rdkafka_broker.c:4975:17 (clickhouse+0x1e378e5e) (BuildId: 7122171f6a93acda7ea89a6d10cce3ad580a715d)
confluentinc#4 rd_kafka_broker_serve build_docker/./contrib/librdkafka/src/rdkafka_broker.c:5080:17 (clickhouse+0x1e378e5e)
confluentinc#5 rd_kafka_broker_thread_main build_docker/./contrib/librdkafka/src/rdkafka_broker.c:5237:25 (clickhouse+0x1e372619) (BuildId: 7122171f6a93acda7ea89a6d10cce3ad580a715d)
confluentinc#6 _thrd_wrapper_function build_docker/./contrib/librdkafka/src/tinycthread.c:576:9 (clickhouse+0x1e47a57b) (BuildId: 7122171f6a93acda7ea89a6d10cce3ad580a715d)
Refs: ClickHouse/ClickHouse#60443
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TSan report (founded by ClickHouse CI):
Refs: ClickHouse/ClickHouse#60443
Fixes: #4625