Bugfix in example code #1

bmilekic · 2012-11-01T18:21:24Z

Hey

Have a look at this bugfix. Without it the producer example code corrupts messages in some cases (e.g., when piping output from cat or similar into the example).

The fix I did works, but it's a bit quick. You can pull it in now, or wait until I do some more fixes.

Thank you for open-sourcing your work!

b

…tdin, but then make a copy before passing it into librdkafka for consumption.

… len. This fixes this issue. (reported by: andoma)

edenhill · 2012-11-01T19:02:25Z

Good catch, bmilekic.
The problem is that rd_kafka_produce() does not copy the data (for performance reasons).
So your approach is correct, make an allocated copy (or even better; pre-allocate the fgets() buffer for each spin) and then pass the allocated pointer along with the _FREE flag as you did.

There is no need to null-terminate, rd_kafka_produce() simply sends a binary blob and does not know nor care about strings.

Finalize your fix and I'll merge it.

Thanks.

Bugfix in example code

Fix MSan error

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

Bosko Milekic added 2 commits November 1, 2012 11:46

In producer example, use a 2K on-the-stack buffer to read into from s…

bc92100

…tdin, but then make a copy before passing it into librdkafka for consumption.

Comment: strncpy() does not null terminate if it fill all bytes up to…

90dafa4

… len. This fixes this issue. (reported by: andoma)

edenhill added a commit that referenced this pull request Nov 13, 2012

Merge pull request #1 from bmilekic/master

c818ae5

Bugfix in example code

edenhill merged commit c818ae5 into confluentinc:master Nov 13, 2012

xiaojun789 mentioned this pull request Nov 8, 2013

crashes on too large messages #24

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azat pushed a commit to azat-archive/librdkafka that referenced this pull request Dec 13, 2020

Merge pull request confluentinc#1 from ClickHouse-Extras/fix-msan

08251b8

Fix MSan error

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Question: sending single message with no delay #3202

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coredump in producer::poll #3647

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librdkafka deadlock at cnd_timedwait when destroy the consumer #3660

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Bugfix in example code #1

Bugfix in example code #1

bmilekic commented Nov 1, 2012

edenhill commented Nov 1, 2012

Bugfix in example code #1

Bugfix in example code #1

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bmilekic commented Nov 1, 2012

edenhill commented Nov 1, 2012