Comment 0 for bug 1291299

innodb_version.............. 5.6.15-rel63.0
version..................... 5.6.15-56-log
version_comment............. Percona Server (GPL), Release rel63.0, Revision 519
version_compile_machine..... x86_64
version_compile_os.......... Linux

# xtrabackup --version
xtrabackup version 2.1.8 for Percona Server 5.1.73 unknown-linux-gnu (x86_64) (revision id: 733)

Steps:
[1]
# xtrabackup_56 --backup --target-dir=.
...
...
...
xtrabackup: The latest check point (for incremental): '1260343926214'
xtrabackup: Stopping log copying thread.
.>> log scanned up to (1260528996709)

xtrabackup: Transaction log of lsn (1259945473453) to (1260528996709) was copied.

[2]
# xtrabackup_56 --prepare --target-dir=. --use-memory=4G
xtrabackup_56 version 2.1.8 for MySQL server 5.6.15 Linux (x86_64) (revision id: 733)
xtrabackup: cd to /home/pavel/slv222/.
xtrabackup: This target seems to be not prepared yet.
xtrabackup: xtrabackup_logfile detected: size=656474112, start_lsn=(1259945473453)
xtrabackup: using the following InnoDB configuration for recovery:
xtrabackup: innodb_data_home_dir = ./
xtrabackup: innodb_data_file_path = ibdata1:10M:autoextend
xtrabackup: innodb_log_group_home_dir = ./
xtrabackup: innodb_log_files_in_group = 1
xtrabackup: innodb_log_file_size = 656474112
xtrabackup: using the following InnoDB configuration for recovery:
xtrabackup: innodb_data_home_dir = ./
xtrabackup: innodb_data_file_path = ibdata1:10M:autoextend
xtrabackup: innodb_log_group_home_dir = ./
xtrabackup: innodb_log_files_in_group = 1
xtrabackup: innodb_log_file_size = 656474112
xtrabackup: Starting InnoDB instance for recovery.
xtrabackup: Using 4294967296 bytes for buffer pool (set by --use-memory parameter)
InnoDB: The InnoDB memory heap is disabled
InnoDB: Mutexes and rw_locks use GCC atomic builtins
InnoDB: Compressed tables use zlib 1.2.3
InnoDB: Using CPU crc32 instructions
InnoDB: Initializing buffer pool, size = 4.0G
InnoDB: Completed initialization of buffer pool
InnoDB: Highest supported file format is Barracuda.
InnoDB: Log scan progressed past the checkpoint lsn 1259945473453
InnoDB: Database was not shutdown normally!
InnoDB: Starting crash recovery.
InnoDB: Reading tablespace information from the .ibd files...
InnoDB: Restoring possible half-written data pages
InnoDB: from the doublewrite buffer...
InnoDB: Doing recovery: scanned up to log sequence number 1259950715904 (0%)
InnoDB: Doing recovery: scanned up to log sequence number 1259955958784 (1%)
InnoDB: Doing recovery: scanned up to log sequence number 1259961201664 (2%)
InnoDB: Doing recovery: scanned up to log sequence number 1259966444544 (3%)
InnoDB: Doing recovery: scanned up to log sequence number 1259971687424 (4%)
InnoDB: Doing recovery: scanned up to log sequence number 1259976930304 (5%)
InnoDB: Doing recovery: scanned up to log sequence number 1259982173184 (6%)
InnoDB: Doing recovery: scanned up to log sequence number 1259987416064 (7%)
InnoDB: Doing recovery: scanned up to log sequence number 1259992658944 (8%)
InnoDB: Doing recovery: scanned up to log sequence number 1259997901824 (8%)
InnoDB: Doing recovery: scanned up to log sequence number 1260003144704 (9%)
InnoDB: Doing recovery: scanned up to log sequence number 1260008387584 (10%)
InnoDB: Doing recovery: scanned up to log sequence number 1260013630464 (11%)
InnoDB: Doing recovery: scanned up to log sequence number 1260018873344 (12%)
InnoDB: Doing recovery: scanned up to log sequence number 1260024116224 (13%)
InnoDB: Doing recovery: scanned up to log sequence number 1260029359104 (14%)
InnoDB: Doing recovery: scanned up to log sequence number 1260034601984 (15%)
InnoDB: Doing recovery: scanned up to log sequence number 1260039844864 (16%)
InnoDB: Doing recovery: scanned up to log sequence number 1260045087744 (17%)
InnoDB: Doing recovery: scanned up to log sequence number 1260050330624 (17%)
InnoDB: Doing recovery: scanned up to log sequence number 1260055573504 (18%)
InnoDB: Doing recovery: scanned up to log sequence number 1260060816384 (19%)
InnoDB: Doing recovery: scanned up to log sequence number 1260066059264 (20%)
InnoDB: Doing recovery: scanned up to log sequence number 1260071302144 (21%)
InnoDB: Doing recovery: scanned up to log sequence number 1260076545024 (22%)
InnoDB: Doing recovery: scanned up to log sequence number 1260081787904 (23%)
InnoDB: Doing recovery: scanned up to log sequence number 1260087030784 (24%)
InnoDB: Doing recovery: scanned up to log sequence number 1260092273664 (25%)
InnoDB: Doing recovery: scanned up to log sequence number 1260097516544 (26%)
InnoDB: Doing recovery: scanned up to log sequence number 1260102759424 (26%)
InnoDB: Doing recovery: scanned up to log sequence number 1260108002304 (27%)
InnoDB: Doing recovery: scanned up to log sequence number 1260113245184 (28%)
InnoDB: Doing recovery: scanned up to log sequence number 1260118488064 (29%)
InnoDB: Doing recovery: scanned up to log sequence number 1260123730944 (30%)
InnoDB: Doing recovery: scanned up to log sequence number 1260128973824 (31%)
InnoDB: Doing recovery: scanned up to log sequence number 1260134216704 (32%)
InnoDB: Doing recovery: scanned up to log sequence number 1260139459584 (33%)
InnoDB: Doing recovery: scanned up to log sequence number 1260144702464 (34%)
InnoDB: Doing recovery: scanned up to log sequence number 1260149945344 (35%)
Segmentation fault (core dumped)

[3]
# gdb xtrabackup_56 core.11437
(gdb) bt
#0 0x00007fe95cfb2670 in __strrchr_sse42 () from /lib64/libc.so.6
#1 0x00000000005cae90 in strrchr (data_dir_path=0x0, tablename=0x7fe842beda61 "berg/#sql-7781_ff0ad", extention=0x9eb461 "ibd") at /usr/include/string.h:251
#2 os_file_make_remote_pathname (data_dir_path=0x0, tablename=0x7fe842beda61 "berg/#sql-7781_ff0ad", extention=0x9eb461 "ibd")
    at /usr/src/debug/percona-xtrabackup-2.1.8/mysql-5.6/storage/innobase/os/os0file.cc:3277
#3 0x00000000004d72c3 in fil_create_new_single_table_tablespace (space_id=4781, tablename=0x7fe842beda61 "berg/#sql-7781_ff0ad", dir_path=<value optimized out>, flags=1024,
    flags2=<value optimized out>, size=4) at /usr/src/debug/percona-xtrabackup-2.1.8/mysql-5.6/storage/innobase/fil/fil0fil.cc:3369
#4 0x00000000004d7a89 in fil_op_log_parse_or_replay (ptr=0x7fe842beda76 "\035\222\255\001\033\222\255\001\037\035\222\255", end_ptr=<value optimized out>, type=<value optimized out>,
    space_id=4781, log_flags=<value optimized out>) at /usr/src/debug/percona-xtrabackup-2.1.8/mysql-5.6/storage/innobase/fil/fil0fil.cc:2406
#5 0x0000000000490b9b in recv_parse_log_recs (available_memory=4278190080, store_to_hash=1, buf=<value optimized out>, len=<value optimized out>, start_lsn=<value optimized out>,
    contiguous_lsn=<value optimized out>, group_scanned_lsn=0x7fff3978f918) at /usr/src/debug/percona-xtrabackup-2.1.8/mysql-5.6/storage/innobase/log/log0recv.cc:2508
#6 recv_scan_log_recs (available_memory=4278190080, store_to_hash=1, buf=<value optimized out>, len=<value optimized out>, start_lsn=<value optimized out>,
    contiguous_lsn=<value optimized out>, group_scanned_lsn=0x7fff3978f918) at /usr/src/debug/percona-xtrabackup-2.1.8/mysql-5.6/storage/innobase/log/log0recv.cc:2963
#7 0x0000000000491884 in recv_group_scan_log_recs (type=78656949, limit_lsn=18446744073709551615, min_flushed_lsn=1222941760714, max_flushed_lsn=1222941760714)
    at /usr/src/debug/percona-xtrabackup-2.1.8/mysql-5.6/storage/innobase/log/log0recv.cc:3023
#8 recv_recovery_from_checkpoint_start_func (type=78656949, limit_lsn=18446744073709551615, min_flushed_lsn=1222941760714, max_flushed_lsn=1222941760714)
    at /usr/src/debug/percona-xtrabackup-2.1.8/mysql-5.6/storage/innobase/log/log0recv.cc:3315
#9 0x00000000004bf0fb in innobase_start_or_create_for_mysql () at /usr/src/debug/percona-xtrabackup-2.1.8/mysql-5.6/storage/innobase/srv/srv0start.cc:2363
#10 0x00000000004553ab in innodb_init () at xtrabackup.cc:1438
#11 xtrabackup_prepare_func () at xtrabackup.cc:5455
#12 0x000000000045777b in main (argc=0, argv=0x1fa0ed0) at xtrabackup.cc:6035

I use MySQL 5.6 "DATA DIRECTORY" feature. But I don't know if it cause a bug or not.