InnoDB occasionally skips the doublewrite buffer write for some pages

innodb.doublewrite 'innodb_plugin'       w2 [ fail ]

        Test ended at 2017-05-20 15:15:56

CURRENT_TEST: innodb.doublewrite

mysqltest: At line 220: query 'set global innodb_fil_make_page_dirty_debug = @space_id' failed: 2013: Lost connection to MySQL server during query

The result from queries just before the failure was:

< snip >

f1	f2

1	############

2	++++++++++++

3	////////////

4	------------

5	............

# Test End

# ---------------------------------------------------------------

# Test Begin: Test if recovery works if 2nd page of user

# tablespace is corrupted.

select space from information_schema.innodb_sys_tables

where name = 'test/t1' into @space_id;

# Ensure that dirty pages of table t1 is flushed.

flush tables t1 for export;

unlock tables;

begin;

insert into t1 values (6, repeat('%', 400));

# Make the 2nd page dirty for table t1

set global innodb_saved_page_number_debug = 1;

set global innodb_fil_make_page_dirty_debug = @space_id;

More results from queries before failure can be found in D:\win32-debug\build\mysql-test\var\2\log\doublewrite.log

Server [mysqld.1 - pid: 5132, winpid: 5132, exit: 768] failed during test run

Server log from this test:

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

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