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observation¶

With the latest TBB version from Factory (libtbb12-2021.4.0-1.1.x86_64.rpm) the signalblocker test might hang which we've observed multiple times in OBS builds. This is reproducible on TW by installing the latest TBB library and the latest OpenCV library (libopencv4_5-4.5.2-2.3.x86_64.rpm) from Factory:

OS_AUTOINST_TEST_THREAD_COUNT=20 os-autoinst-test t/28-signalblocker.t 
Build directory: /hdd/openqa-devel/build/os-autoinst-ninja
[1/2] cd /hdd/openqa-devel/repos/os-autoinst && /hdd/openqa-devel/repos/os-autoinst/tools/invoke-tests --prove-tool /usr/bin/prove --make-tool /usr/bin/ninja --build-directory /hdd/openqa-devel/build/os-autoinst-ninja
t/28-signalblocker.t .. 
ok 1 - initially one thread
# Blocking SIGCHLD and SIGTERM
# threads used: 20 of 8
TBB Warning: The number of workers is currently limited to 7. The request for 19 workers is ignored. Further requests for more workers will be silently ignored until the limit changes.

acceptance criteria¶

• AC1: Tests do no longer deadlock (using TBB from Factory).
• AC2: The thread creation in autotest/driver does not deadlock (using TBB from Factory).

further notes¶

• There hasn't been an update of OpenCV so TBB seems to be the changing part here. The new version of OpenCV is only required because TBB changed the soname and therefore OpenCV needs to be rebuilt to use the new TBB library.
• Draft PR: https://github.com/os-autoinst/os-autoinst/pull/1860