tls_test fails with connection reset

This is fairly easy to trigger with rr record -h:

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
[       OK ] tls_timeout_recovery
[ RUN      ] tls_recv_one
[       OK ] tls_recv_one
[ RUN      ] tls_recv_two
[       OK ] tls_recv_two
[ RUN      ] tls_recv_send
[       OK ] tls_recv_send
[ RUN      ] tls_recv_send_sendback
listen_send_cb(0x7644d78b680, connection reset, 0x7644d78b680)
0x36 != 0
[   LINE   ] --- netmgr_common.c:446: error: Failure!Aborted