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

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 Refs: ClickHouse/ClickHouse#60939 Refs: confluentinc#4625

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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winbatch mentioned this pull request Dec 27, 2013

static linking of librdkafka.a needs dynamic pthreads linking #34

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xianping mentioned this pull request Jan 14, 2014

nginx worker processes exit with signal 11 when publishing messages in nginx #56

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This was referenced Jan 30, 2014

APIv2: Changes in the next version of the API #66

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Crash on exit #72

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FrankVanYoung mentioned this pull request Mar 31, 2014

rkb->rkb_fetching > 0 error #84

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xhcqwlgithub mentioned this pull request Jun 25, 2014

Segmentation fault when creating producer #125

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laxpio mentioned this pull request Aug 4, 2014

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desmondhe mentioned this pull request Sep 3, 2014

dead-lock in multi-thread enviroment #145

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winbatch mentioned this pull request Sep 10, 2014

Difference between isr info from librdkafka vs kafka-list-topic.sh #147

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laxpio mentioned this pull request Oct 9, 2014

Crash on rd_kafka_topic_metadata_update #155

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affranchi mentioned this pull request Mar 26, 2015

Seg fault with multi brokers #224

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mahb94 mentioned this pull request Apr 21, 2015

client consume from kafka crushed occasionally #254

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DEvil0000 mentioned this pull request Apr 24, 2015

make tests: test 14 fails for me #259

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edenhill mentioned this pull request Jun 8, 2015

2 races conditions #281

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shalstea mentioned this pull request Jul 1, 2015

rdkafka can't be built with native compilers #319

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rathdeep mentioned this pull request Jul 3, 2015

Best approach to read messages from multiple topics or partitions #322

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Deadlock on broker restart #326

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shalstea mentioned this pull request Jul 14, 2015

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sh9189 mentioned this pull request Jul 29, 2015

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Rdkafka Failed to detect broker state #346

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chriscrenshaw mentioned this pull request Aug 14, 2015

rd_kafka_buf_destroy() always aborts - causing an immediate crash of the consumer app #353

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ylgeeker mentioned this pull request Aug 28, 2015

rd_kafka_topic_destroy0 will crash ?? @ 0.8.6 #360

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DEvil0000 mentioned this pull request Oct 12, 2015

rdkafka stopping connection retries on RdKafka::ERR__ALL_BROKERS_DOWN #373

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hyhtemple mentioned this pull request Jun 30, 2020

It is crashed ,when use method of the producer in the thread #2947

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Message not delivered if header added. #2996

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~100% CPU usage for rdk:kafka #3107

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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

davinnfld mentioned this pull request Jan 6, 2021

Question: sending single message with no delay #3202

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write2jaydeep mentioned this pull request Mar 3, 2021

consumer failed on broker version fall back #3283

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Duplicate message from RDKafka #3311

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High CPU usage in librdkafka1.4.0 producer #2986

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johncagle mentioned this pull request Sep 22, 2021

segfault in rd_kafka_msgq_set_metadata() from /lib64/librdkafka.so.1 (corrupt TAILQ) #3559

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rd_kafka_clustid does not return until timeout when kafka has no topic #3620

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eelyaj mentioned this pull request Nov 22, 2021

Throughput decrease badly while broker number increase. #3626

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RdKafka::Producer parses aws kafka broker reporting segment errors when the cluster information is retrieved after a few minutes #3632

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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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benzmarkus mentioned this pull request Oct 19, 2022

Spamming the logs during rebalancing #4028

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eig mentioned this pull request Apr 18, 2023

0045-subscribe-update / do_test_regex_many_mock sporadic (but frequent) failure #4259

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Missing first messages when Producing on Azure with SSL #4363

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Thread 15 "rdk:broker-1" received signal SIGSEGV, Segmentation fault. #1054 #4505

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Unable to connect C++ consumer client with OAUTHBEARER mechanism to server #4655

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chunaiarun mentioned this pull request Aug 29, 2024

timeout issue with async commit , we want to commit every message after consuming #4827

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segmentation fault from rdkafka_topic.c #4907

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C++ application built with librdkafka with GCC TSAN crashes when starting #4929

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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