in_random does not work on Fluent Bit v2.1.3 master on Windows

[cosmo0920]

Bug Report

Describe the bug
With the commit 43682ad, in_random plugin is not working as expected. Instead, it always complains -5 errors.

To Reproduce

• Rubular link if applicable:
• Example log message if applicable:

$ .\bin\fluent-bit.exe -c .\lua.yaml
Fluent Bit v2.1.3
* Copyright (C) 2015-2022 The Fluent Bit Authors
* Fluent Bit is a CNCF sub-project under the umbrella of Fluentd
* https://fluentbit.io

[2023/05/01 18:00:18] [ info] [fluent bit] version=2.1.3, commit=43682ad1f8, pid=17740
[2023/05/01 18:00:18] [ info] [storage] ver=1.4.0, type=memory, sync=normal, checksum=off, max_chunks_up=128
[2023/05/01 18:00:18] [ info] [cmetrics] version=0.6.1
[2023/05/01 18:00:18] [ info] [ctraces ] version=0.3.0
[2023/05/01 18:00:18] [ info] [input:random:random.0] initializing
[2023/05/01 18:00:18] [ info] [input:random:random.0] storage_strategy='memory' (memory only)
[2023/05/01 18:00:18] [ info] [sp] stream processor started
[2023/05/01 18:00:18] [ info] [output:stdout:stdout.0] worker #0 started
[2023/05/01 18:00:19] [error] [input:random:random.0] log event encoding error : -5
[2023/05/01 18:00:20] [error] [input:random:random.0] log event encoding error : -5
[2023/05/01 18:00:21] [error] [input:random:random.0] log event encoding error : -5
[2023/05/01 18:00:22] [error] [input:random:random.0] log event encoding error : -5

• Steps to reproduce the problem:

Using with the following configuration:

lua.yaml

service:
    flush:           1
    daemon:          off
    log_level:       info

pipeline:
    inputs:
        - name:    random
          tag:     test
          samples: 10

    filters:
        - name:  lua
          match: "*"
          call:  append_tag
          code:  |
              function append_tag(tag, timestamp, record)
                 new_record = record
                 new_record["tag"] = tag
                 return 1, timestamp, new_record
              end

    outputs:
        - name:  stdout
          match: "*"

Expected behavior

When using in_random, the latter data pipeline should receive generate logs from there and without -5 errors.

Screenshots

Your Environment

• Version used: Fluent Bit v2.1.3 master (43682ad)
• Configuration: Described as above (lua.yaml)
• Environment name and version (e.g. Kubernetes? What version?): On premise. Windows laptop
• Server type and version:
• Operating System and version: Windows 11 Pro 22H2
• Filters and plugins:
  • input: random
  • filter: lua
  • output: stdout

Additional context

[cosmo0920]

This issue is raised by the line: https://github.com/fluent/fluent-bit/blob/master/plugins/in_random/random.c#L80
The phenomenon will be suppressed with using FLB_LOG_EVENT_STRING_VALUE("rand_value", strlen("rand_value")) or stop using immediate value for the argument of that macro.

This behavior is weird and we have to digging for the root cause of this issue. Building fluent-bit with ASAN would be helpful.

[leonardo-albertovich]

According to https://github.com/fluent/fluent-bit/blob/master/include/fluent-bit/flb_log_event_encoder.h#L194 that's exactly how the macro FLB_LOG_EVENT_CSTRING_VALUE is expanded so I agree with you, we need to use ASAN and practical debugging to properly understand it.

[github-actions]

This issue is stale because it has been open 90 days with no activity. Remove stale label or comment or this will be closed in 5 days. Maintainers can add the exempt-stale label.

[cosmo0920]

I confirmed that #7971 fixes this issue.