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WARNING: ThreadSanitizer: data race (pid=<implemspecific>)
  Read of size 8 at <implemspecific> by main thread (mutexes: write M<implemspecific>):
    #0 camlRecord_field.reader_<implemspecific> <implemspecific> (<implemspecific>)
    #1 camlRecord_field.entry <implemspecific> (<implemspecific>)
    #2 caml_program <implemspecific> (<implemspecific>)

  Previous write of size 8 at <implemspecific> by thread T1 (mutexes: write M<implemspecific>):
    #0 camlRecord_field.writer_<implemspecific> <implemspecific> (<implemspecific>)
    #1 camlStdlib__Domain.body_<implemspecific> <implemspecific> (<implemspecific>)

  As if synchronized via sleep:
    #0 usleep <implemspecific> (<implemspecific>)
    #1 wg_wait <implemspecific> (<implemspecific>)
    #2 camlRecord_field.reader_<implemspecific> <implemspecific> (<implemspecific>)
    #3 camlRecord_field.entry <implemspecific> (<implemspecific>)
    #4 caml_program <implemspecific> (<implemspecific>)

  Mutex M<implemspecific> (<implemspecific>) created at:
    #0 pthread_mutex_init <implemspecific> (<implemspecific>)
    #1 caml_plat_mutex_init <implemspecific> (<implemspecific>)
    #2 caml_init_domains <implemspecific> (<implemspecific>)
    #3 caml_init_gc <implemspecific> (<implemspecific>)

  Mutex M<implemspecific> (<implemspecific>) created at:
    #0 pthread_mutex_init <implemspecific> (<implemspecific>)
    #1 caml_plat_mutex_init <implemspecific> (<implemspecific>)
    #2 caml_init_domains <implemspecific> (<implemspecific>)
    #3 caml_init_gc <implemspecific> (<implemspecific>)

  Thread T1 (tid=<implemspecific>, running) created by main thread at:
    #0 pthread_create <implemspecific> (<implemspecific>)
    #1 caml_domain_spawn <implemspecific> (<implemspecific>)
    #2 caml_c_call <implemspecific> (<implemspecific>)
    #3 camlStdlib__Domain.spawn_<implemspecific> <implemspecific> (<implemspecific>)
    #4 camlRecord_field.entry <implemspecific> (<implemspecific>)
    #5 caml_program <implemspecific> (<implemspecific>)

SUMMARY: ThreadSanitizer: data race (<systemspecific>:<implemspecific>) in camlRecord_field.reader_<implemspecific>
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ThreadSanitizer: reported 1 warnings