Failed to set O_DIRECT on xb_doublewrite when running MTR test cases

All MTR test fail with error:

==============================================================================

TEST RESULT TIME (ms) or COMMENT
--------------------------------------------------------------------------

worker[1] Using MTR_BUILD_THREAD 300, with reserved ports 13000..13009
main.alias [ fail ] Found warnings/errors in server log file!
        Test ended at 2017-03-02 15:49:41
line
2017-03-02T12:49:33.406293Z 0 [Warning] InnoDB: Failed to set O_DIRECT on file/home/sveta/build/ps-5.7/mysql-test/var/mysqld.1/data/xb_doublewrite;create: Invalid argument, continuing anyway. O_DIRECT is known to result in 'Invalid argument' on Linux on tmpfs, see MySQL Bug#26662.

FS: ecryptfs

Removing var directory before running test does not help.

How to repeat:

sveta@Thinkie:~/build/ps-5.7/mysql-test$ mount
...
/home/.ecryptfs/sveta/.Private on /home/sveta type ecryptfs (rw,nosuid,nodev,relatime,ecryptfs_fnek_sig=1fe38ac67150d26d,ecryptfs_sig=3da24c1114964df7,ecryptfs_cipher=aes,ecryptfs_key_bytes=16,ecryptfs_unlink_sigs)
gvfsd-fuse on /run/user/1000/gvfs type fuse.gvfsd-fuse (rw,nosuid,nodev,relatime,user_id=1000,group_id=1000)
sveta@Thinkie:~/build/ps-5.7/mysql-test$ rm -rf var
sveta@Thinkie:~/build/ps-5.7/mysql-test$ ls -l var
ls: cannot access 'var': No such file or directory
sveta@Thinkie:~/build/ps-5.7/mysql-test$ ./mtr alias
Logging: ./mtr alias
MySQL Version 5.7.17
Checking supported features...
 - SSL connections supported
 - binaries are debug compiled
Collecting tests...
Removing old var directory...
Creating var directory '/home/sveta/build/ps-5.7/mysql-test/var'...
Installing system database...
Using parallel: 1

==============================================================================

TEST RESULT TIME (ms) or COMMENT
--------------------------------------------------------------------------

worker[1] Using MTR_BUILD_THREAD 300, with reserved ports 13000..13009
main.alias [ fail ] Found warnings/errors in server log file!
        Test ended at 2017-03-02 15:55:01
line
2017-03-02T12:54:53.171057Z 0 [Warning] InnoDB: Failed to set O_DIRECT on file/home/sveta/build/ps-5.7/mysql-test/var/mysqld.1/data/xb_doublewrite;create: Invalid argument, continuing anyway. O_DIRECT is known to result in 'Invalid argument' on Linux on tmpfs, see MySQL Bug#26662.
^ Found warnings in /home/sveta/build/ps-5.7/mysql-test/var/log/mysqld.1.err
ok

 - the logfile can be found in '/home/sveta/build/ps-5.7/mysql-test/var/log/main.alias/alias.log'
--------------------------------------------------------------------------
The servers were restarted 0 times
Spent 0.000 of 32 seconds executing testcases
mysql-test-run: WARNING: Got errors/warnings while running tests, please examine '/home/sveta/build/ps-5.7/mysql-test/var/log/warnings' for details.

Completed: Failed 1/1 tests, 0.00% were successful.

Failing test(s): main.alias

The log files in var/log may give you some hint of what went wrong.

If you want to report this error, please read first the documentation
at http://dev.mysql.com/doc/mysql/en/mysql-test-suite.html

mysql-test-run: *** ERROR: there were failing test cases