tls_test gets stuck in tls_timeout_recovery

This happens quite often:

rr: Saving execution to trace directory `/home/ondrej/.local/share/rr/tls_test-0'.
[==========] Running 11 test(s).
[ RUN      ] tls_noop
[       OK ] tls_noop
[ RUN      ] tls_noresponse
[       OK ] tls_noresponse
[ RUN      ] tls_timeout_recovery

and it gets stuck.

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