out_stdout: new STDOUT Output Plugin. #5

pandax381 · 2015-06-02T09:55:34Z

I implemented a new STDOUT Output Plugin.
I hope that it will assist debugging.

$ ./fluent-bit -i cpu -o stdout
Fluent-Bit v0.1.0
Copyright (C) Treasure Data

[2015/06/02 18:32:54] [ info] starting engine
[0] {"time"=>1433237575, "cpu"=>0.000000}
[1] {"time"=>1433237576, "cpu"=>0.000000}
[2] {"time"=>1433237577, "cpu"=>0.000000}
[3] {"time"=>1433237578, "cpu"=>0.000000}
[2015/06/02 18:32:59] [ info] Flush buf 96 bytes
[0] {"time"=>1433237579, "cpu"=>0.000000}
[1] {"time"=>1433237580, "cpu"=>0.000000}
[2] {"time"=>1433237581, "cpu"=>0.000000}
[3] {"time"=>1433237582, "cpu"=>0.000000}
[4] {"time"=>1433237583, "cpu"=>0.000000}
[2015/06/02 18:33:04] [ info] Flush buf 120 bytes
...

Note: An error has occurred that "libmsgpack.a is not a PIC format" in the process of generating a shared library of fluent-bit. So, I added the code to add the -fPIC option to CMakeLists.txt of msgpack.

Scanning dependencies of target fluent-bit-shared
[ 81%] Building C object src/CMakeFiles/fluent-bit-shared.dir/flb_pack.c.o
[ 84%] Building C object src/CMakeFiles/fluent-bit-shared.dir/flb_input.c.o
[ 87%] Building C object src/CMakeFiles/fluent-bit-shared.dir/flb_output.c.o
[ 90%] Building C object src/CMakeFiles/fluent-bit-shared.dir/flb_config.c.o
[ 93%] Building C object src/CMakeFiles/fluent-bit-shared.dir/flb_network.c.o
[ 96%] Building C object src/CMakeFiles/fluent-bit-shared.dir/flb_utils.c.o
[100%] Building C object src/CMakeFiles/fluent-bit-shared.dir/flb_engine.c.o
Linking C shared library ../library/libfluent-bit.so
/usr/bin/ld: ../library/libmsgpack.a(unpack.c.o): relocation R_X86_64_32S against `.rodata' can not be used when making a shared object; recompile with -fPIC
../library/libmsgpack.a: could not read symbols: Bad value
collect2: error: ld returned 1 exit status
make[2]: *** [library/libfluent-bit.so] Error 1
make[1]: *** [src/CMakeFiles/fluent-bit-shared.dir/all] Error 2
make: *** [all] Error 2

Signed-off-by: Masaya YAMAMOTO pandax381@gmail.com

Signed-off-by: Masaya YAMAMOTO <pandax381@gmail.com>

out_stdout: new STDOUT Output Plugin.

edsiper · 2015-06-02T22:19:15Z

thanks!

edsiper · 2015-06-03T00:44:06Z

would you please check the following issue ?

#6

pandax381 · 2015-06-03T01:17:24Z

Sorry, It's my mistake.
The cause of this problem was in in_mem plugin.
I will pull request to fix the problem urgently.

api: add new API flb_service_set()

When Fluent Bit encounters with a partial parser definition, it crashes badly with a segmentation fault. $ ./bin/fluent-bit -R parser.conf -c tail.conf ... [2020/01/15 16:11:21] [error] [parser] no parser 'format' found for 'simple' in file 'conf/timestamp.parser' [engine] caught signal (SIGSEGV) #0 0x558bc4a0a226 in flb_parser_decoder_list_destroy() at src/flb_parser_decoder.c:700 fluent#1 0x558bc4a05d75 in flb_parser_conf_file() at src/flb_parser.c:566 fluent#2 0x558bc49f4bdd in flb_config_set_property() at src/flb_config.c:406 fluent#3 0x558bc49e24ae in flb_service_conf() at src/fluent-bit.c:446 fluent#4 0x558bc49e2f90 in main() at src/fluent-bit.c:807 fluent#5 0x7fa1cb7f109a in ???() at ???:0 fluent#6 0x558bc49e13a9 in ???() at ???:0 fluent#7 0xffffffffffffffff in ???() at ???:0 Aborted This is just because `decoders` is not being initialized properly, and that confuses Fluent Bit to deallocate a random memmory block on the cleanup path. Fix it. Signed-off-by: Fujimoto Seiji <fujimoto@clear-code.com>

When Fluent Bit encounters with a partial parser definition, it crashes badly with a segmentation fault. $ ./bin/fluent-bit -R parser.conf -c tail.conf ... [2020/01/15 16:11:21] [error] [parser] no parser 'format' found for 'simple' in file 'conf/timestamp.parser' [engine] caught signal (SIGSEGV) #0 0x558bc4a0a226 in flb_parser_decoder_list_destroy() at src/flb_parser_decoder.c:700 #1 0x558bc4a05d75 in flb_parser_conf_file() at src/flb_parser.c:566 #2 0x558bc49f4bdd in flb_config_set_property() at src/flb_config.c:406 #3 0x558bc49e24ae in flb_service_conf() at src/fluent-bit.c:446 #4 0x558bc49e2f90 in main() at src/fluent-bit.c:807 #5 0x7fa1cb7f109a in ???() at ???:0 #6 0x558bc49e13a9 in ???() at ???:0 #7 0xffffffffffffffff in ???() at ???:0 Aborted This is just because `decoders` is not being initialized properly, and that confuses Fluent Bit to deallocate a random memmory block on the cleanup path. Fix it. Signed-off-by: Fujimoto Seiji <fujimoto@clear-code.com>

Clean CloudWatch log group once the validation is done

When libco starts, it might enter in a race condition if multiple threads are trying to initialize the 'co_swap' function, this check is done on every coroutine creation: ==346246== Possible data race during read of size 8 at 0x5CA890 by thread #5 ==346246== Locks held: none ==346246== at 0x48EFAE: co_create (amd64.c:132) ==346246== by 0x173035: flb_output_coro_create (flb_output.h:511) ==346246== by 0x173035: output_thread (flb_output_thread.c:281) ==346246== by 0x1889BE: step_callback (flb_worker.c:44) ==346246== by 0x4843B1A: ??? (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_helgrind-amd64-linux.so) ==346246== by 0x487E58F: start_thread (pthread_create.c:463) ==346246== by 0x4F47222: clone (clone.S:95) ==346246== ==346246== This conflicts with a previous write of size 8 by thread #4 ==346246== Locks held: none ==346246== at 0x48EFCB: co_create (amd64.c:134) ==346246== by 0x173035: flb_output_coro_create (flb_output.h:511) ==346246== by 0x173035: output_thread (flb_output_thread.c:281) ==346246== by 0x1889BE: step_callback (flb_worker.c:44) ==346246== by 0x4843B1A: ??? (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_helgrind-amd64-linux.so) ==346246== by 0x487E58F: start_thread (pthread_create.c:463) ==346246== by 0x4F47222: clone (clone.S:95) ==346246== Address 0x5ca890 is 0 bytes inside data symbol "co_swap" This patch introduce a new API for flb_coro interface that aims to be called inside every worker thread. The access to this first initialization is protected. No more race conditions on that piece of code has been seen with valgrind after the usage of this new function (next patches). Signed-off-by: Eduardo Silva <eduardo@treasure-data.com>

…es strictly Without this check, the following weird error is occurred intermittently: ```log [0] dummy.0: [1664938706.407551000, {"message"=>"dummy"}] [2022/10/05 11:58:27] [ info] [test] flush record flb-rt-core_chunk_trace(32205,0x16fe87000) malloc: *** error for object 0x600002600074: pointer being realloc'd was not allocated flb-rt-core_chunk_trace(32205,0x16fe87000) malloc: *** set a breakpoint in malloc_error_break to debug ``` The main reason is, num_records index is broken in some cases: ``` flb-rt-core_chunk_trace(32205,0x16fe87000) malloc: *** error for object 0x600002600074: pointer being realloc'd was not allocated flb-rt-core_chunk_trace(32205,0x16fe87000) malloc: *** set a breakpoint in malloc_error_break to debug [2022/10/05 11:58:27] [ info] [input] pausing dummy.0 Process 32205 stopped * thread #2, name = 'flb-pipeline', stop reason = breakpoint 1.1 frame #0: 0x00000001b34a3120 libsystem_malloc.dylib`malloc_error_break libsystem_malloc.dylib`malloc_error_break: -> 0x1b34a3120 <+0>: pacibsp 0x1b34a3124 <+4>: stp x29, x30, [sp, #-0x10]! 0x1b34a3128 <+8>: mov x29, sp 0x1b34a312c <+12>: nop Target 0: (flb-rt-core_chunk_trace) stopped. (lldb) bt * thread #2, name = 'flb-pipeline', stop reason = breakpoint 1.1 * frame #0: 0x00000001b34a3120 libsystem_malloc.dylib`malloc_error_break frame #1: 0x00000001b3494844 libsystem_malloc.dylib`malloc_vreport + 428 frame #2: 0x00000001b3497f34 libsystem_malloc.dylib`malloc_report + 64 frame #3: 0x00000001b3488210 libsystem_malloc.dylib`realloc + 328 frame #4: 0x0000000100006154 flb-rt-core_chunk_trace`flb_realloc(ptr=0x0000600002600074, size=18446744064764412176) at flb_mem.h:94:12 frame #5: 0x0000000100005fc8 flb-rt-core_chunk_trace`callback_add_record(data=0x0000600003014000, size=135, cb_data=0x0000600000004010) at core_chunk_trace.c:51:28 frame #6: 0x00000001001268b0 flb-rt-core_chunk_trace`out_lib_flush(event_chunk=0x0000600000c14000, out_flush=0x0000600001714000, i_ins=0x0000000100b09ab0, out_context=0x0000600000204a80, config=0x000000010181d200) at out_lib.c:197:9 frame #7: 0x0000000100029d70 flb-rt-core_chunk_trace`output_pre_cb_flush at flb_output.h:517:5 frame #8: 0x000000010044fa64 flb-rt-core_chunk_trace`co_switch(handle=0x000000010044fa64) at aarch64.c:133:4 (lldb) frane select 5 error: 'frane' is not a valid command. (lldb) frame select 5 frame #5: 0x0000000100005fc8 flb-rt-core_chunk_trace`callback_add_record(data=0x0000600003014000, size=135, cb_data=0x0000600000004010) at core_chunk_trace.c:51:28 48 flb_calloc(1, sizeof(struct callback_record)); 49 } else { 50 ctx->records = (struct callback_record *) -> 51 flb_realloc(ctx->records, 52 (ctx->num_records+1)*sizeof(struct callback_record)); 53 } 54 if (ctx->records == NULL) { (lldb) po ctx->records 0x0000600002600074 (lldb) po ctx->records 0x0000600002600074 (lldb) po ctx->num_records -559071216 ``` Signed-off-by: Hiroshi Hatake <hatake@calyptia.com>

The tls variable for out_flush_params is not initialized as the flb_start function is not called during the dry run. Call flb_init directly and then shutdown the engine. configuration test is successful ================================================================= ==63633==ERROR: AddressSanitizer: attempting free on address which was not malloc()-ed: 0x0001f71b3ac0 in thread T0 #0 0x103c9f260 in wrap_free+0x98 (libclang_rt.asan_osx_dynamic.dylib:arm64e+0x53260) fluent#1 0x100179d9c in flb_free flb_mem.h:127 fluent#2 0x10017f4a0 in flb_output_exit flb_output.c:481 fluent#3 0x1001cb038 in flb_engine_shutdown flb_engine.c:1119 fluent#4 0x10010d45c in flb_destroy flb_lib.c:240 fluent#5 0x100008c40 in flb_main fluent-bit.c:1348 fluent#6 0x10000c644 in main fluent-bit.c:1456 fluent#7 0x18f11e0dc (<unknown module>) frame fluent#6: 0x000000010017f4a4 fluent-bit`flb_output_exit(config=0x0000000102b00200) at flb_output.c:481:9 478 479 params = FLB_TLS_GET(out_flush_params); 480 if (params) { -> 481 flb_free(params); 482 } 483 } Signed-off-by: Holger Hans Peter Freyther <holger@freyther.de>

The tls variable for out_flush_params is not initialized as the flb_start function is not called during the dry run. Call flb_init directly and then shutdown the engine. configuration test is successful ================================================================= ==63633==ERROR: AddressSanitizer: attempting free on address which was not malloc()-ed: 0x0001f71b3ac0 in thread T0 #0 0x103c9f260 in wrap_free+0x98 (libclang_rt.asan_osx_dynamic.dylib:arm64e+0x53260) #1 0x100179d9c in flb_free flb_mem.h:127 #2 0x10017f4a0 in flb_output_exit flb_output.c:481 #3 0x1001cb038 in flb_engine_shutdown flb_engine.c:1119 #4 0x10010d45c in flb_destroy flb_lib.c:240 #5 0x100008c40 in flb_main fluent-bit.c:1348 #6 0x10000c644 in main fluent-bit.c:1456 #7 0x18f11e0dc (<unknown module>) frame #6: 0x000000010017f4a4 fluent-bit`flb_output_exit(config=0x0000000102b00200) at flb_output.c:481:9 478 479 params = FLB_TLS_GET(out_flush_params); 480 if (params) { -> 481 flb_free(params); 482 } 483 } Signed-off-by: Holger Hans Peter Freyther <holger@freyther.de>

The tls variable for out_flush_params is not initialized as the flb_start function is not called during the dry run. Call flb_init directly and then shutdown the engine. configuration test is successful ================================================================= ==63633==ERROR: AddressSanitizer: attempting free on address which was not malloc()-ed: 0x0001f71b3ac0 in thread T0 #0 0x103c9f260 in wrap_free+0x98 (libclang_rt.asan_osx_dynamic.dylib:arm64e+0x53260) fluent#1 0x100179d9c in flb_free flb_mem.h:127 fluent#2 0x10017f4a0 in flb_output_exit flb_output.c:481 fluent#3 0x1001cb038 in flb_engine_shutdown flb_engine.c:1119 fluent#4 0x10010d45c in flb_destroy flb_lib.c:240 fluent#5 0x100008c40 in flb_main fluent-bit.c:1348 fluent#6 0x10000c644 in main fluent-bit.c:1456 fluent#7 0x18f11e0dc (<unknown module>) frame fluent#6: 0x000000010017f4a4 fluent-bit`flb_output_exit(config=0x0000000102b00200) at flb_output.c:481:9 478 479 params = FLB_TLS_GET(out_flush_params); 480 if (params) { -> 481 flb_free(params); 482 } 483 } Signed-off-by: Holger Hans Peter Freyther <holger@freyther.de> Signed-off-by: Markus Bergholz <git@osuv.de>

This patch fixes a race condition between the scheduler timer callback (cb_azure_kusto_ingest) and flush/delete paths that causes SIGSEGV crashes when the timer accesses freed file list memory. Problem: The scheduler timer iterates ctx->stream_active->files via mk_list_foreach_safe while concurrent flush/exit paths delete files from the same list without synchronization. This causes use-after-free when the timer callback accesses memory that has been freed by task destruction. Stack trace from production crash: #0 memcpy() at memmove-vec-unaligned-erms.S:222 fluent#1 cio_file_content_copy() at lib/chunkio/src/cio_file.c:547 fluent#2 flb_fstore_file_content_copy() at src/flb_fstore.c:289 fluent#3 construct_request_buffer() at plugins/out_azure_kusto/azure_kusto.c fluent#4 cb_azure_kusto_ingest() at plugins/out_azure_kusto/azure_kusto.c fluent#5 flb_sched_event_handler() at src/flb_scheduler.c:624 Solution: 1. Add pthread_mutex_t files_mutex to protect file list operations 2. Implement lock→mark file locked→unlock→I/O→re-lock pattern in timer callback to minimize lock hold time during network I/O 3. Add skip-if-locked guards in delete/inactive/cleanup functions to prevent double-free and deadlock 4. Cancel upload timer in cb_azure_kusto_exit before cleanup to prevent races during shutdown 5. Move early-delete to after successful queue enqueue to prevent UAF on queue failure 6. Clear fsf->data = NULL in store_exit to prevent dangling pointers The fix has been validated in production environments where the SIGSEGV crashes were occurring with multiple workers and buffering enabled. Signed-off-by: Yash Ananthakrishnan <yash@github.com>

This patch fixes a race condition between the scheduler timer callback (cb_azure_kusto_ingest) and flush/delete paths that causes SIGSEGV crashes when the timer accesses freed file list memory. Problem: The scheduler timer iterates ctx->stream_active->files via mk_list_foreach_safe while concurrent flush/exit paths delete files from the same list without synchronization. This causes use-after-free when the timer callback accesses memory that has been freed by task destruction. Stack trace from production crash: #0 memcpy() at memmove-vec-unaligned-erms.S:222 fluent#1 cio_file_content_copy() at lib/chunkio/src/cio_file.c:547 fluent#2 flb_fstore_file_content_copy() at src/flb_fstore.c:289 fluent#3 construct_request_buffer() at plugins/out_azure_kusto/azure_kusto.c fluent#4 cb_azure_kusto_ingest() at plugins/out_azure_kusto/azure_kusto.c fluent#5 flb_sched_event_handler() at src/flb_scheduler.c:624 Solution: 1. Add pthread_mutex_t files_mutex to protect file list operations 2. Implement lock→mark file locked→unlock→I/O→re-lock pattern in timer callback to minimize lock hold time during network I/O 3. Add skip-if-locked guards in delete/inactive/cleanup functions to prevent double-free and deadlock 4. Cancel upload timer in cb_azure_kusto_exit before cleanup to prevent races during shutdown 5. Move early-delete to after successful queue enqueue to prevent UAF on queue failure 6. Clear fsf->data = NULL in store_exit to prevent dangling pointers The fix has been validated in production environments where the SIGSEGV crashes were occurring with multiple workers and buffering enabled. Signed-off-by: Yash Ananthakrishnan <yash@github.com> Signed-off-by: Yashwanth Anantharaju <yaananth@users.noreply.github.com>

out_stdout: new STDOUT Output Plugin.

f9d94ef

Signed-off-by: Masaya YAMAMOTO <pandax381@gmail.com>

edsiper added a commit that referenced this pull request Jun 2, 2015

Merge pull request #5 from pandax381/out_stdout

634584e

out_stdout: new STDOUT Output Plugin.

edsiper merged commit 634584e into fluent:master Jun 2, 2015

pandax381 deleted the out_stdout branch June 3, 2015 05:14

yonchin mentioned this pull request May 9, 2018

fluent-bit Crash at startup #584

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Gabriel1688 mentioned this pull request Jun 1, 2018

How to terminate orphan management thread created by fluentbit? #614

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ChitraKumarS mentioned this pull request Jul 13, 2018

SIGSEGV in msgpack_sbuffer_write #682

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Gabriel1688 mentioned this pull request Aug 1, 2018

[engine] caught signal (SIGSEGV) when consecutive tcp packages are arrived via in_tcp plugin. #701

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yubobo mentioned this pull request Aug 6, 2018

fluent-bit Crash at startup #704

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prashantvicky mentioned this pull request Aug 28, 2018

Output plugin #721

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kushwiz mentioned this pull request Dec 4, 2018

[SIGSEV] Http_proxy not working with out_http #938

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cve-reporting mentioned this pull request Feb 25, 2019

Memory corruption in MQTT input plugin leading to crash of the server while processing crafted MQTT message #1135

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fujimotos pushed a commit to fujimotos/fluent-bit that referenced this pull request Jul 22, 2019

Merge pull request fluent#5 from nokute78/service_conf

68a7f5b

api: add new API flb_service_set()

maglun2 mentioned this pull request Nov 19, 2019

Polling of prometheus metrics randomly causes SIGSEGV #1755

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rmacian mentioned this pull request Feb 19, 2020

scheduler corruption on high number of retries #1956

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huzhou mentioned this pull request Apr 22, 2020

Fluent-bit pod generate core dump every time the pod is restarted after migrating to 1.4.2 #2127

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phiremande mentioned this pull request Aug 25, 2020

SIGSEGV: when destroying connection #2497

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allamand pushed a commit to allamand/fluent-bit that referenced this pull request Oct 26, 2020

Merge pull request fluent#5 from hossain-rayhan/cicd-cw-clean

71ee3a6

Clean CloudWatch log group once the validation is done

manojna10 mentioned this pull request Dec 18, 2020

Segfault at flb_input_chunk_destroy as failure of flb_input_chunk_get_tag() is not handled #2875

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edsiper mentioned this pull request Feb 14, 2021

input_chunk: Get real chunk size when calculating fs_chunks_size #3054

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4 tasks

AkshayDubey29 mentioned this pull request Mar 14, 2021

[solved] Memory usage on in_tail (WAL) #3073

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This was referenced Jun 21, 2022

Crash when connection to AWS CloudWatch logs drops #5246

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Fluentbit TLS SIGSEGV error kube-logging/logging-operator#1029

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tracyliuzw mentioned this pull request Sep 21, 2022

fluentbit not picking up file #6077

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rawahars referenced this pull request in rawahars/fluent-bit Oct 24, 2022

GitBook: [#5] docs: modifying the sandbox environment link

2c65ede

Minipada mentioned this pull request Dec 8, 2022

Use external C input plugin leads to crash on flb_config_map_set () #6519

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shuishou1983 mentioned this pull request Feb 21, 2023

Output kafka avro: schema not found #4488

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Valt25 mentioned this pull request Feb 22, 2023

Fleunt-Bit crashed with SIGSEV error #6897

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lilhore mentioned this pull request Mar 10, 2023

SIGSEGV at startup when a rewrite_tag filter has no Match #6991

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Rishi-Tea mentioned this pull request Mar 13, 2023

SIGSEGV on 1.9.4 with stack trace #5753

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amolbms mentioned this pull request May 5, 2023

could not enqueue records into the ring buffer #7071

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RaniVedprakash mentioned this pull request Jul 25, 2023

Fluentbit pods are crashing/restarting after SIGSEV error #7751

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mrunmayee003 mentioned this pull request Nov 28, 2023

SIGSEGV for forward input plugin #8225

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srini38 mentioned this pull request Dec 2, 2023

lib: ctraces: Fix a crash in fluent-bit when in_opentelemetry plugin handles a trace message from opentelemetry-cpp/example_otlp_http sample app #8241

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4 tasks

hilshalom mentioned this pull request Dec 5, 2023

Getting SIGSEGV when host is restarted #8252

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zecke mentioned this pull request May 25, 2024

core: Fix crash when running dry #8872

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1 task

anderssynstad mentioned this pull request Oct 25, 2024

Setting threaded to true in prometheus_scrape input causes SIGSEGV #9525

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AkshayDubey29 mentioned this pull request Nov 15, 2024

With threaded on, SIGSEGV occurs during a dry run #9355

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demetthyl mentioned this pull request Feb 12, 2025

node exporter cpu crash on boot on 64cpu flavor host #9940

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tanmaya-panda1 mentioned this pull request Apr 14, 2025

Release 3.2 of fluent-bit crashes on azure-blob support #9677

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doraamgui mentioned this pull request Apr 28, 2025

Fluent Bit 4.0.1 azure_kusto output plugin SIGSEV #10257

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jim-barber-he mentioned this pull request Aug 14, 2025

Various SIGSEGV crashes in fluent-bit version 4.0.7 #10729

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sanchoooo mentioned this pull request Sep 19, 2025

[S3 OUTPUT] odd errors when workers are set #10570

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soopak79 mentioned this pull request Oct 20, 2025

Segmentation fault after [cio file] error deleting file at close on Fluent Bit v4.1.1 #11049

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epsteina16 mentioned this pull request Dec 2, 2025

Double free in in_forward when processing msgpack traces #11238

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