pfs unit test ASan error in 5.6.36

[Laurynas Biveinis]

Starting with upstream 5.6.36 merge, under AddressSanitizer:

unit_tests w0 [ fail ]
        Test ended at 2017-05-05 02:59:45

ctest failed with exit code 2048, see result below
...
10/24 Test #10: pfs ..............................***Failed 0.75 sec
1..216
...
ok 216 - 313 event names

=================================================================
==21284==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 40 byte(s) in 1 object(s) allocated from:
    #0 0x7f2293bfa070 in calloc (/usr/lib/x86_64-linux-gnu/libasan.so.3+0xc7070)
    #1 0x5631cabe2669 in my_malloc /mnt/workspace/percona-server-5.6-asan-param/BUILD_TYPE/release-asan/Host/yakkety-64-bigram/mysys/my_malloc.c:38
    #2 0x5631cabe8d9d in _lf_alloc_new /mnt/workspace/percona-server-5.6-asan-param/BUILD_TYPE/release-asan/Host/yakkety-64-bigram/mysys/lf_alloc-pin.c:440
    #3 0x5631cabeb355 in lf_hash_insert /mnt/workspace/percona-server-5.6-asan-param/BUILD_TYPE/release-asan/Host/yakkety-64-bigram/mysys/lf_hash.c:373
    #4 0x5631cabb34e7 in find_or_create_file(PFS_thread*, PFS_file_class*, char const*, unsigned int, bool) /mnt/workspace/percona-server-5.6-asan-param/BUILD_TYPE/release-asan/Host/yakkety-64-bigram/storage/perfschema/pfs_instr.cc:1353
    #5 0x5631cabd6715 in create_file_v1 /mnt/workspace/percona-server-5.6-asan-param/BUILD_TYPE/release-asan/Host/yakkety-64-bigram/storage/perfschema/pfs.cc:1791
    #6 0x5631caba32e6 in test_init_disabled() /mnt/workspace/percona-server-5.6-asan-param/BUILD_TYPE/release-asan/Host/yakkety-64-bigram/storage/perfschema/unittest/pfs-t.cc:899
    #7 0x5631caba8152 in do_all_tests() /mnt/workspace/percona-server-5.6-asan-param/BUILD_TYPE/release-asan/Host/yakkety-64-bigram/storage/perfschema/unittest/pfs-t.cc:1658
    #8 0x5631cab9ed28 in main /mnt/workspace/percona-server-5.6-asan-param/BUILD_TYPE/release-asan/Host/yakkety-64-bigram/storage/perfschema/unittest/pfs-t.cc:1668
    #9 0x7f22932653f0 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x203f0)

SUMMARY: AddressSanitizer: 40 byte(s) leaked in 1 allocation(s).

[Yura Sorokin (yura-sorokin)]

https://github.com/percona/percona-server/pull/2086
https://github.com/percona/percona-server/pull/2087

[Shahriyar Rzayev (rzayev-sehriyar)]

Percona now uses JIRA for bug reports so this bug report is migrated to: https://jira.percona.com/browse/PS-1806