tokudb_alter_table.hcad_all_add2 failed in buildbot with timeout

tokudb_alter_table.hcad_all_add2         w3 [ fail ]  timeout after 900 seconds

        Test ended at 2018-01-03 23:04:47

Test case timeout after 900 seconds

== /dev/shm/var/3/log/hcad_all_add2.log == 

insert into foo values (NULL,12345678987,NULL,1,"rewoiu","fds","fr","oiufdsrew", "rewoiu","fds","fr","oiufdsrew");

insert into foo values (2,20,'1999-11-11',0,NULL,NULL,NULL,NULL, NULL,NULL,NULL,NULL);

insert into foo values (2,20,'1999-11-11',0,NULL,NULL,NULL,NULL, "adsf",NULL,"hjfdshj",NULL);

insert into foo values (2,20,'1999-11-11',0,NULL,NULL,NULL,NULL, NULL,"oifds",NULL,"fdsjfds");

insert into foo values (2,20,'1999-11-11',0,NULL,NULL,NULL,NULL, "rewoiu","fds","fr","oiufdsrew");

insert into foo values (2,20,'1999-11-11',0,"adsf",NULL,"hjfdshj",NULL, NULL,NULL,NULL,NULL);

insert into foo values (2,20,'1999-11-11',0,"adsf",NULL,"hjfdshj",NULL, "adsf",NULL,"hjfdshj",NULL);

insert into foo values (2,20,'1999-11-11',0,"adsf",NULL,"hjfdshj",NULL, NULL,"oifds",NULL,"fdsjfds");

insert into foo values (2,20,'1999-11-11',0,"adsf",NULL,"hjfdshj",NULL, "rewoiu","fds","fr","oiufdsrew");

insert into foo values (2,20,'1999-11-11',0,NULL,"oifds",NULL,"fdsjfds", NULL,NULL,NULL,NULL);

insert into foo values (2,20,'1999-11-11',0,NULL,"oifds",NULL,"fdsjfds", "adsf",NULL,"hjfdshj",NULL);

insert into foo values (2,20,'1999-11-11',0,NULL,"oifds",NULL,"fdsjfds", NULL,"oifds",NULL,"fdsjfds");

insert into foo values (2,20,'1999-11-11',0,NULL,"oifds",NULL,"fdsjfds", "rewoiu","fds","fr","oiufdsrew");

insert into foo values (2,20,'1999-11-11',0,"rewoiu","fds","fr","oiufdsrew", NULL,NULL,NULL,NULL);

insert into foo values (2,20,'1999-11-11',0,"rewoiu","fds","fr","oiufdsrew", "adsf",NULL,"hjfdshj",NULL);

insert into foo values (2,20,'1999-11-11',0,"rewoiu","fds","fr","oiufdsrew", NULL,"oifds",NULL,"fdsjfds");

insert into foo values (2,20,'1999-11-11',0,"rewoiu","fds","fr","oiufdsrew", "rewoiu","fds","fr","oiufdsrew");

insert into bar select * from foo;

include/diff_tables.inc [test.foo, test.bar]

alter table foo add column added_4 varchar(10) default NULL after bb, add column added_41 varchar(10) default NULL after bb;

 == /dev/shm/var/3/tmp/analyze-timeout-mysqld.1.err ==

mysqltest: Could not open connection 'default' after 500 attempts: 2002 Can't connect to local MySQL server through socket '/dev/shm/var/tmp/3/mysqld.1.sock' (111)

 - saving '/dev/shm/var/3/log/tokudb_alter_table.hcad_all_add2/' to '/dev/shm/var/log/tokudb_alter_table.hcad_all_add2/'

Retrying test tokudb_alter_table.hcad_all_add2, attempt(2/3)...

worker[3] > Restart  - not started

***Warnings generated in error logs during shutdown after running tests: tokudb_alter_table.auto_inc tokudb_add_index.add_index_2 tokudb_add_index.add_index_3 tokudb_add_index.add_index_7 tokudb_add_index.add_index_8 tokudb_add_index.add_index_12 tokudb_add_index.add_index_4 tokudb_alter_table.ai_di tokudb_add_index.add_index_10 tokudb_add_index.tokudb_bug_1152 tokudb_add_index.falcon_bug_23818_A tokudb_add_index.falcon_bug_23818_2 tokudb_add_index.add_index_9 tokudb_add_index.add_index_17 tokudb_alter_table.hcad_all_add2 tokudb_alter_table.hcad_all_add tokudb_alter_table.di_dui tokudb_add_index.falcon_bug_23818_1 tokudb_add_index.falcon_bug_23818_B tokudb_alter_table.5260 tokudb_add_index.1522 tokudb_add_index.add_index_18 tokudb_add_index.falcon_bug_23692 tokudb_add_index.falcon_bug_23818_C tokudb_add_index.add_index_16 tokudb_alter_table.alter_column_default tokudb_alter_table.drop_add_pk_104 tokudb_add_index.add_index_11 tokudb_add_index.add_index_5 tokudb_alter_table.4630 tokudb_alter_table.frm_discover tokudb_add_index.falcon_bug_23691 tokudb_add_index.add_index_15 tokudb_alter_table.drop_pk_with_prefix tokudb_add_index.add_index_13 tokudb_alter_table.ai_aui tokudb_add_index.add_index_1 tokudb_add_index.falcon_bug_22516 tokudb_add_index.add_index_6 tokudb_add_index.add_index_14

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

tokudb_alter_table.hcad_all_add2         w3 [ retry-pass ]   6929