main.ssl-big fails in bb-10.2-connector-c-integ

perl mysql-test-run.pl --big ssl-big

the failed log is available at http://buildbot.askmonty.org/buildbot/builders/kvm-fulltest/builds/5947/steps/test_2/logs/stdio.

mysqltest failed but provided no output
The result from queries just before the failure was:
< snip >
DROP TABLE IF EXISTS t1, t2;
connect ssl_con,localhost,root,,,,,SSL;
create table t1 (a int);
disconnect ssl_con;

There is a large loop of connects-disconnects in this test ,. It does not fail in 10.2 main