perfschema.hostcache_ipv6_ssl failed in buildbot: server crashed on shutdown

perfschema.hostcache_ipv6_ssl            w1 [ fail ]

        Test ended at 2016-08-26 03:31:42

CURRENT_TEST: perfschema.hostcache_ipv6_ssl

Server [mysqld.1 - pid: 5430, winpid: 5430, exit: 256] failed during test run

Server log from this test:

----------SERVER LOG START-----------

160826  3:31:38 [Note] X509 subject mismatch: should be '/C=??/ST=??/L=??/

    O=No such thing/

    CN=Santa Claus/emailAddress=santa.claus@example.com' but is '/C=FI/ST=Helsinki/L=Helsinki/O=MariaDB/CN=client'

160826  3:31:38 [Note] X509 subject mismatch: should be '/C=??/ST=??/L=??/

    O=No such thing/

    CN=Santa Claus/emailAddress=santa.claus@example.com' but is '/C=FI/ST=Helsinki/L=Helsinki/O=MariaDB/CN=client'

160826  3:31:38 [ERROR] mysqld got signal 11 ;

This could be because you hit a bug. It is also possible that this binary

or one of the libraries it was linked against is corrupt, improperly built,

or misconfigured. This error can also be caused by malfunctioning hardware.

To report this bug, see https://mariadb.com/kb/en/reporting-bugs

We will try our best to scrape up some info that will hopefully help

diagnose the problem, but since we have already crashed, 

something is definitely wrong and this may fail.

Server version: 10.0.28-MariaDB-debug

key_buffer_size=1048576

read_buffer_size=131072

max_used_connections=3

max_threads=153

thread_count=2

It is possible that mysqld could use up to 

key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 61724 K  bytes of memory

Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0xbca8850

Attempting backtrace. You can use the following information to find out

where mysqld died. If you see no messages after this, something went

terribly wrong...

stack_bottom = 0xb1bff29c thread_stack 0x48000

/mnt/buildbot/build/mariadb-10.0.28/sql/mysqld(my_print_stacktrace+0x29)[0x8abd1a9]

/mnt/buildbot/build/mariadb-10.0.28/sql/mysqld(handle_fatal_signal+0x550)[0x83e3fe0]

[0xc70400]

/lib/i386-linux-gnu/libc.so.6(+0x7b678)[0x55d678]

/mnt/buildbot/build/mariadb-10.0.28/sql/mysqld[0x8ad5aab]

/mnt/buildbot/build/mariadb-10.0.28/sql/mysqld(_db_keyword_+0x70)[0x8ad6610]

/mnt/buildbot/build/mariadb-10.0.28/sql/mysqld(_Z10unlink_thdP3THD+0x217)[0x81802f7]

/mnt/buildbot/build/mariadb-10.0.28/sql/mysqld(_Z29one_thread_per_connection_endP3THDb+0x54)[0x8180414]

/mnt/buildbot/build/mariadb-10.0.28/sql/mysqld(_Z24do_handle_one_connectionP3THD+0x133)[0x832ec33]

/mnt/buildbot/build/mariadb-10.0.28/sql/mysqld(handle_one_connection+0x4f)[0x832ed9f]

/mnt/buildbot/build/mariadb-10.0.28/sql/mysqld[0x85bccaa]

/lib/i386-linux-gnu/libpthread.so.0(+0x6d4c)[0xe22d4c]

/lib/i386-linux-gnu/libc.so.6(clone+0x5e)[0x5ccace]

Trying to get some variables.

Some pointers may be invalid and cause the dump to abort.

Query (0x0): 

Connection ID (thread ID): 125

Status: KILL_CONNECTION

Optimizer switch: index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=on,exists_to_in=on

The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains

information that should help you find out what is causing the crash.

Writing a core file

----------SERVER LOG END-------------

mysqltest failed but provided no output

The result from queries just before the failure was:

< snip >

COUNT_FCRDNS_ERRORS	0

COUNT_HOST_ACL_ERRORS	0

COUNT_NO_AUTH_PLUGIN_ERRORS	0

COUNT_AUTH_PLUGIN_ERRORS	0

COUNT_HANDSHAKE_ERRORS	0

COUNT_PROXY_USER_ERRORS	0

COUNT_PROXY_USER_ACL_ERRORS	0

COUNT_AUTHENTICATION_ERRORS	0

COUNT_SSL_ERRORS	4

COUNT_MAX_USER_CONNECTIONS_ERRORS	0

COUNT_MAX_USER_CONNECTIONS_PER_HOUR_ERRORS	0

COUNT_DEFAULT_DATABASE_ERRORS	0

COUNT_INIT_CONNECT_ERRORS	0

COUNT_LOCAL_ERRORS	0

COUNT_UNKNOWN_ERRORS	0

FIRST_ERROR_SEEN	set

LAST_ERROR_SEEN	set

drop user 'user_ssl'@'santa.claus.ipv6.example.com';

drop user 'user_ssl_x509'@'santa.claus.ipv6.example.com';

set global debug_dbug= default;