(16384, 0, 0, 0, 0, 0, 0, 0, 0, 0)
/
1 mount False False
['test_mnt']
1 listdir /
['a1']
1 listdir /
['a1']
2 mount True False
['test_mnt', 'test_mnt2']
2 listdir /
['a2']
3 mount False False
OSError
OSError
OSError
1 chdir /
1 listdir 
['a1']
1 getcwd
/test_mntdir1
1 mkdir test_dir
1 remove test_file
1 rename test_file test_file2
1 rmdir test_dir
1 stat test_file
(1,)
1 statvfs /
(1,)
1 open test_file r
1 open test_file wb
1 umount
2 umount
OSError