main.ssl_timeout, main.ssl_7937 failed (sporadically) in buildbot, unknown SSL error (0x80090308)

main.ssl_timeout                         w4 [ fail ]

        Test ended at 2017-09-02 20:01:09

CURRENT_TEST: main.ssl_timeout

mysqltest: At line 7: query 'connect  ssl_con,localhost,root,,,,,SSL read_timeout=5' failed: 2026: Unknown SSL error (0x80090308)

The result from queries just before the failure was:

# connect with read timeout so SLEEP() should timeout

main.ssl_7937 'ssl'                      w4 [ fail ]

        Test ended at 2017-09-02 18:26:32

CURRENT_TEST: main.ssl_7937

--- D:/win32-debug/build/src/mysql-test/r/ssl_7937.result	2017-09-02 17:34:58.793016300 +0000

+++ D:\win32-debug\build\src\mysql-test\r\ssl_7937.reject	2017-09-02 18:26:31.393918200 +0000

@@ -6,8 +6,7 @@

 have_ssl

 yes

 mysql --ssl -e "call test.have_ssl()"

-have_ssl

-yes

+ERROR 2026 (HY000): Unknown SSL error (0x80090308)

 mysql --ssl-ca=cacert.pem --ssl-verify-server-cert -e "call test.have_ssl()"

 have_ssl

 yes

mysqltest: Result length mismatch