toolchain/55760: Multiple t_tsan_*:*profile test cases fail

[gson%gson.org@localhost (Andreas Gustafsson)]

>Number:         55760
>Category:       toolchain
>Synopsis:       Multiple t_tsan_*:*profile test cases fail
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    toolchain-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Oct 28 07:15:00 +0000 2020
>Originator:     Andreas Gustafsson
>Release:        NetBSD-current
>Organization:
>Environment:
System: NetBSD
Architecture: x86_64
Machine: amd64
>Description:

The following test cases have been consistently failing on real amd64
hardware ever since they were added on September 14:

  usr.bin/c++/t_tsan_data_race:data_race_profile
  usr.bin/c++/t_tsan_heap_use_after_free:heap_use_after_free_profile
  usr.bin/c++/t_tsan_lock_order_inversion:lock_order_inversion_profile
  usr.bin/c++/t_tsan_locked_mutex_destroy:locked_mutex_destroy_profile
  usr.bin/c++/t_tsan_signal_errno:signal_errno_profile
  usr.bin/c++/t_tsan_thread_leak:thread_leak_profile
  usr.bin/c++/t_tsan_vptr_race:vptr_race_profile
  usr.bin/cc/t_tsan_data_race:data_race_profile
  usr.bin/cc/t_tsan_heap_use_after_free:heap_use_after_free_profile
  usr.bin/cc/t_tsan_lock_order_inversion:lock_order_inversion_profile
  usr.bin/cc/t_tsan_locked_mutex_destroy:locked_mutex_destroy_profile
  usr.bin/cc/t_tsan_signal_errno:signal_errno_profile
  usr.bin/cc/t_tsan_thread_leak:thread_leak_profile

Log output from a recent failure on real hardware:

  http://www.gson.org/netbsd/bugs/build/amd64-baremetal/2020/2020.10.26.21.34.10/test.html#usr.bin_cc_t_tsan_data_race_data_race_profile

They are also failing on the qemu-based testbeds:

  http://releng.netbsd.org/b5reports/amd64/2020/2020.10.27.00.07.18/test.html#usr.bin_cc_t_tsan_data_race_data_race_profile

>How-To-Repeat:

>Fix: