innodb.alter_crash failed in buildbot - The process cannot access the file

innodb.alter_crash 'innodb'              w3 [ fail ]

        Test ended at 2018-07-26 11:17:18

CURRENT_TEST: innodb.alter_crash

The process cannot access the file because it is being used by another process.

mysqltest: In included file "./include/start_mysqld.inc": 

included from D:/win32-debug/build/src/mysql-test/suite/innodb/t/alter_crash.test at line 77:

At line 10: exec of 'D:\win32-debug\build\client\Debug\echo.exe "restart" > D:/win32-debug/build/mysql-test/var/3/tmp/mysqld.1.expect' failed, error: 1, status: 1, errno: 2

Output from before failure:

# Restart mysqld after the crash and reconnect.

The result from queries just before the failure was:

< snip >

ALTER TABLE t1 ADD INDEX (c2,c3);

ERROR HY000: Index c3 is corrupted

ALTER TABLE t1 CHANGE c3 c3 INT NOT NULL;

CHECK TABLE t1;

Table	Op	Msg_type	Msg_text

test.t1	check	status	OK

ALTER TABLE t1 ADD INDEX (c2,c3);

DROP TABLE t1;

#

# Bug #14669848 CRASH DURING ALTER MAKES ORIGINAL TABLE INACCESSIBLE

#

# -- Scenario 1:

# Crash the server in ha_innobase::commit_inplace_alter_table()

# just after committing the dictionary changes.

CREATE TABLE t1 (f1 INT NOT NULL, f2 INT NOT NULL) ENGINE=innodb;

INSERT INTO t1 VALUES (1,2),(3,4);

SET DEBUG_DBUG='+d,innodb_alter_commit_crash_after_commit';

ALTER TABLE t1 ADD PRIMARY KEY (f2, f1);

ERROR HY000: Lost connection to MySQL server during query

# Restart mysqld after the crash and reconnect.

More results from queries before failure can be found in D:\win32-debug\build\mysql-test\var\3\log\alter_crash.log