Leaks handling member_id

[HofiOne]

On macOS ARM version

 brew info librdkafka
==> librdkafka: stable 2.12.1 (bottled), HEAD
Apache Kafka C/C++ library
https://github.com/confluentinc/librdkafka
Installed
/opt/homebrew/Cellar/librdkafka/2.12.1 (41 files, 10.3MB) *
  Poured from bottle using the formulae.brew.sh API on 2025-11-08 at 08:58:06
From: https://github.com/Homebrew/homebrew-core/blob/HEAD/Formula/lib/librdkafka.rb
License: BSD-2-Clause
==> Dependencies
Build: pkgconf ✔
Required: lz4 ✔, lzlib ✔, openssl@3 ✔, zstd ✔
==> Options
--HEAD
	Install HEAD version
==> Analytics
install: 4,008 (30 days), 9,552 (90 days), 39,727 (365 days)
install-on-request: 2,525 (30 days), 6,024 (90 days), 27,764 (365 days)
build-error: 3 (30 days)

I can see leaking strings at exit (by a good chance related to the member_id) like:

Code Type:       ARM64
Platform:        macOS
Parent Process:  debugserver [46404]
Target Type:     live task

Date/Time:       2025-11-09 10:45:17.764 +0100
Launch Time:     2025-11-09 10:43:52.719 +0100
OS Version:      macOS 26.1 (25B78)
Report Version:  7
Analysis Tool:   /usr/bin/leaks

Physical footprint:         919.3M
Physical footprint (peak):  950.8M
Idle exit:                  untracked
----

leaks Report Version: 4.0, multi-line stacks
Process 46403: 9676 nodes malloced for 3721 KB
Process 46403: 6 leaks for 480 total leaked bytes.

STACK OF 4 INSTANCES OF 'ROOT LEAK: <malloc in rd_kafka_cgrp_op_serve>':
8   libsystem_pthread.dylib               0x1903f8ba8 thread_start + 8
7   libsystem_pthread.dylib               0x1903fdc08 _pthread_start + 136
6   librdkafka.1.dylib                    0x1072d4d4c _thrd_wrapper_function + 28
5   librdkafka.1.dylib                    0x10735aa50 rd_kafka_thread_main + 416
4   librdkafka.1.dylib                    0x107287c28 rd_kafka_q_serve0 + 808
3   librdkafka.1.dylib                    0x1072a2368 rd_kafka_cgrp_op_serve + 200
2   libsystem_c.dylib                     0x190296728 strndup + 72
1   libsystem_malloc.dylib                0x1902117d8 _malloc + 88
0   libsystem_malloc.dylib                0x190229f40 _malloc_zone_malloc_instrumented_or_legacy + 152
====
    4 (320 bytes) << TOTAL >>
      1 (80 bytes) ROOT LEAK: <malloc in rd_kafka_cgrp_op_serve 0x7870192c0> [80]  length: 57  "group-test-topic-189-00b9ffdc-843e-4510-84e8-29b4c9b74968"
      1 (80 bytes) ROOT LEAK: <malloc in rd_kafka_cgrp_op_serve 0x787019310> [80]  length: 57  "group-test-topic-189-3b48876e-666d-421f-acc5-4c71c98f40bf"
      1 (80 bytes) ROOT LEAK: <malloc in rd_kafka_cgrp_op_serve 0x787019360> [80]  length: 57  "group-test-topic-189-00b9ffdc-843e-4510-84e8-29b4c9b74968"
      1 (80 bytes) ROOT LEAK: <malloc in rd_kafka_cgrp_op_serve 0x787019400> [80]  length: 57  "group-test-topic-189-3b48876e-666d-421f-acc5-4c71c98f40bf"

STACK OF 2 INSTANCES OF 'ROOT LEAK: <malloc in rd_kafka_cgrp_op_serve>':
8   libsystem_pthread.dylib               0x1903f8ba8 thread_start + 8
7   libsystem_pthread.dylib               0x1903fdc08 _pthread_start + 136
6   librdkafka.1.dylib                    0x1072d4d4c _thrd_wrapper_function + 28
5   librdkafka.1.dylib                    0x10735aa50 rd_kafka_thread_main + 416
4   librdkafka.1.dylib                    0x107287c28 rd_kafka_q_serve0 + 808
3   librdkafka.1.dylib                    0x1072a2368 rd_kafka_cgrp_op_serve + 200
2   libsystem_c.dylib                     0x190296728 strndup + 72
1   libsystem_malloc.dylib                0x1902117d8 _malloc + 88
0   libsystem_malloc.dylib                0x190229f40 _malloc_zone_malloc_instrumented_or_legacy + 152
====
    2 (160 bytes) << TOTAL >>
      1 (80 bytes) ROOT LEAK: <malloc in rd_kafka_cgrp_op_serve 0x7870194a0> [80]  length: 57  "group-test-topic-189-a6cd5521-7745-4613-9ea3-3b147846b354"
      1 (80 bytes) ROOT LEAK: <malloc in rd_kafka_cgrp_op_serve 0x787019540> [80]  length: 57  "group-test-topic-189-a6cd5521-7745-4613-9ea3-3b147846b354"