race condition of monkey's flb_libco

[nokute78]

Bug Report

Describe the bug

I tested http_server api, valgrind reported Invalid read of co_swap_function.

==40851== Invalid read of size 8
==40851==    at 0x724A1F: co_swap_function (in /home/taka/git/fluent-bit/build/bin/fluent-bit)
==40851==  Address 0x78031f8 is 8 bytes inside a block of size 25,088 alloc'd
==40851==    at 0x483B7F3: malloc (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so)
==40851==    by 0x725B30: co_create (amd64.c:142)
==40851==    by 0x719C2D: mk_http_thread_create (mk_http_thread.c:217)
==40851==    by 0x715E4B: mk_http_init (mk_http.c:748)
==40851==    by 0x714C94: mk_http_request_prepare (mk_http.c:232)
==40851==    by 0x717C76: mk_http_sched_read (mk_http.c:1568)
==40851==    by 0x713892: mk_sched_event_read (mk_scheduler.c:693)
==40851==    by 0x71C613: mk_server_worker_loop (mk_server.c:487)
==40851==    by 0x7131ED: mk_sched_launch_worker_loop (mk_scheduler.c:416)
==40851==    by 0x4865608: start_thread (pthread_create.c:477)
==40851==    by 0x4B11292: clone (clone.S:95)
==40851== 

Similar issue was reported #3055 and it was fixed fluent-bit's libco.
b058feb
b48e658

I don't know whether monkey's flb_libco is fixed or not.

To Reproduce

• Rubular link if applicable: None

• Example log message if applicable: None

• Steps to reproduce the problem:
  a.conf:

[SERVICE]
    HTTP_Server on
    storage.metrics on
[INPUT]
    Name dummy

[OUTPUT]
    Name null

1. valgrind --leak-check=full fluent-bit -c a.conf
2. curl localhost:2020/api/v1/uptime
3. (wait 30sec)
4. curl localhost:2020/api/v1/uptime (uptime_sec >= 30)

Expected behavior

Valgrind reports no error.

Screenshots

None

Your Environment

• Version used: master
• Configuration: Above config
• Environment name and version (e.g. Kubernetes? What version?): Ubuntu 20.04
• Server type and version: Ubuntu 20.04
• Operating System and version: Ubuntu 20.04
• Filters and plugins: None

Additional context

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[github-actions]

This issue was closed because it has been stalled for 5 days with no activity.