Setting threaded to true in prometheus_scrape input causes SIGSEGV #9525
Description
Bug Report
Describe the bug
Setting the threaded key to true for prometheus_scrape input causes Fluent Bit to throw SIGSEGV errors.
To Reproduce
---
service:
storage.path: /var/spool/fluent-bit
pipeline:
inputs:
- name: prometheus_scrape
host: 127.0.0.1
port: 9100
tag: metrics.node
metrics_path: /metrics
scrape_interval: 10s
threaded: false
outputs:
- name: null
match: '*'
# /opt/fluent-bit/bin/fluent-bit -c test.yaml -D
Fluent Bit v3.1.9
* Copyright (C) 2015-2024 The Fluent Bit Authors
* Fluent Bit is a CNCF sub-project under the umbrella of Fluentd
* https://fluentbit.io
______ _ _ ______ _ _ _____ __
| ___| | | | | ___ (_) | |____ |/ |
| |_ | |_ _ ___ _ __ | |_ | |_/ /_| |_ __ __ / /`| |
| _| | | | | |/ _ \ '_ \| __| | ___ \ | __| \ \ / / \ \ | |
| | | | |_| | __/ | | | |_ | |_/ / | |_ \ V /.___/ /_| |_
\_| |_|\__,_|\___|_| |_|\__| \____/|_|\__| \_/ \____(_)___/
configuration test is successful
#
Then changing threaded from false to true:
---
service:
storage.path: /var/spool/fluent-bit
pipeline:
inputs:
- name: prometheus_scrape
host: 127.0.0.1
port: 9100
tag: metrics.node
metrics_path: /metrics
scrape_interval: 10s
threaded: true
outputs:
- name: null
match: '*'
# /opt/fluent-bit/bin/fluent-bit -c test.yaml -D
Fluent Bit v3.1.9
* Copyright (C) 2015-2024 The Fluent Bit Authors
* Fluent Bit is a CNCF sub-project under the umbrella of Fluentd
* https://fluentbit.io
______ _ _ ______ _ _ _____ __
| ___| | | | | ___ (_) | |____ |/ |
| |_ | |_ _ ___ _ __ | |_ | |_/ /_| |_ __ __ / /`| |
| _| | | | | |/ _ \ '_ \| __| | ___ \ | __| \ \ / / \ \ | |
| | | | |_| | __/ | | | |_ | |_/ / | |_ \ V /.___/ /_| |_
\_| |_|\__,_|\___|_| |_|\__| \____/|_|\__| \_/ \____(_)___/
configuration test is successful
[2024/10/25 07:55:51] [engine] caught signal (SIGSEGV)
#0 0x5639131a8e7e in flb_input_exit_all() at src/flb_input.c:1341
#1 0x5639131c3138 in flb_engine_shutdown() at src/flb_engine.c:1121
#2 0x56391319d264 in flb_destroy() at src/flb_lib.c:240
#3 0x56391310dc1b in flb_main() at src/fluent-bit.c:1360
#4 0x7f707cc46249 in ???() at ???:0
#5 0x7f707cc46304 in ???() at ???:0
#6 0x56391310b800 in ???() at ???:0
#7 0xffffffffffffffff in ???() at ???:0
Aborted
#
Expected behavior
I expect a supported configuration key to not throw an error and cause the program to die.
Your Environment
- Version used: 3.1.9
- Configuration: See above.
- Environment name and version (e.g. Kubernetes? What version?):
- Server type and version: Virtual
- Operating System and version: Debian 12
- Filters and plugins: None.
Additional context
This generates a significant amount of noise due to the fluent-bit service keeps retarting.
On one random server, that fluent-bit service has retarted 184 times the last 8 hours alone ...