Comment 3 for bug 1347768

I can confirm the problem on the same version:
mysql> select @@version,@@version_comment;
+----------------+---------------------------------------------------------------------------------------------------+
| @@version | @@version_comment |
+----------------+---------------------------------------------------------------------------------------------------+
| 5.6.19-67.0-56 | Percona XtraDB Cluster (GPL), Release rel67.0, Revision 824, WSREP version 25.6, wsrep_25.6.r4111 |
+----------------+---------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

However, the crash does not happen when wsrep_provider is not set:
mysql> show status like 'ws%';
+--------------------------+----------------------+
| Variable_name | Value |
+--------------------------+----------------------+
| wsrep_cluster_conf_id | 18446744073709551615 |
| wsrep_cluster_size | 0 |
| wsrep_cluster_state_uuid | |
| wsrep_cluster_status | Disconnected |
| wsrep_connected | OFF |
| wsrep_local_bf_aborts | 0 |
| wsrep_local_index | 18446744073709551615 |
| wsrep_provider_name | |
| wsrep_provider_vendor | |
| wsrep_provider_version | |
| wsrep_ready | ON |
+--------------------------+----------------------+
11 rows in set (0.00 sec)

mysql> INSERT INTO r8kmb_redirect_links VALUES (550,'http://mysite.com/images/download/ßуñûічýøù_ôþóþòір_þфõÑ.doc','','','',0,'2013-07-15 14:29:42','0000-00-00 00:00:00');
Query OK, 1 row affected (0.09 sec)

When wsrep_provider is enabled, I get the same crash:

mysql> INSERT INTO r8kmb_redirect_links VALUES (550,'http://mysite.com/images/download/ßуñûічýøù_ôþóþòір_þфõÑ.doc','','','',0,'2013-07-15 14:29:42','0000-00-00 00:00:00');
ERROR 2013 (HY000): Lost connection to MySQL server during query

2014-07-24 23:55:33 7f73886e9700 InnoDB: Assertion failure in thread 140134186915584 in file ha_innodb.cc line 6759
InnoDB: Failing assertion: buff <= buff_start + buff_len
InnoDB: We intentionally generate a memory trap.
InnoDB: Submit a detailed bug report to http://bugs.mysql.com.
InnoDB: If you get repeated assertion failures or crashes, even
InnoDB: immediately after the mysqld startup, there may be
InnoDB: corruption in the InnoDB tablespace. Please refer to
InnoDB: http://dev.mysql.com/doc/refman/5.6/en/forcing-innodb-recovery.html
InnoDB: about forcing recovery.
21:55:33 UTC - mysqld got signal 6 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
We will try our best to scrape up some info that will hopefully help
diagnose the problem, but since we have already crashed,
something is definitely wrong and this may fail.
Please help us make Percona XtraDB Cluster better by reporting any
bugs at https://bugs.launchpad.net/percona-xtradb-cluster

key_buffer_size=8388608
read_buffer_size=131072
max_used_connections=1
max_threads=153
thread_count=3
connection_count=1
It is possible that mysqld could use up to
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 69256 K bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x2d2dcf0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 7f73886e8d38 thread_stack 0x40000
/usr/sbin/mysqld(my_print_stacktrace+0x35)[0x8f36b5]
/usr/sbin/mysqld(handle_fatal_signal+0x4c4)[0x6635c4]
/usr/lib64/libpthread.so.0[0x336620f750]
/usr/lib64/libc.so.6(gsignal+0x39)[0x3365a35c39]
/usr/lib64/libc.so.6(abort+0x148)[0x3365a37348]
/usr/sbin/mysqld[0x909d4e]
/usr/sbin/mysqld(_ZN11ha_innobase17wsrep_append_keysEP3THDbPKhS3_+0x1d4)[0x90a654]
/usr/sbin/mysqld[0x9152b9]
/usr/sbin/mysqld(_ZN7handler12ha_write_rowEPh+0xa9)[0x5a7c99]
/usr/sbin/mysqld(_Z12write_recordP3THDP5TABLEP9COPY_INFOS4_+0x8a)[0x6cbdca]
/usr/sbin/mysqld(_Z12mysql_insertP3THDP10TABLE_LISTR4ListI4ItemERS3_IS5_ES6_S6_15enum_duplicatesb+0xb70)[0x6d3940]
/usr/sbin/mysqld(_Z21mysql_execute_commandP3THD+0xf70)[0x6e8050]
/usr/sbin/mysqld(_Z11mysql_parseP3THDPcjP12Parser_state+0x658)[0x6ed768]
/usr/sbin/mysqld[0x6ed8c1]
/usr/sbin/mysqld(_Z16dispatch_command19enum_server_commandP3THDPcj+0x1362)[0x6ef412]
/usr/sbin/mysqld(_Z10do_commandP3THD+0x1e3)[0x6f0f73]
/usr/sbin/mysqld(_Z24do_handle_one_connectionP3THD+0x17f)[0x6b9bdf]
/usr/sbin/mysqld(handle_one_connection+0x47)[0x6b9db7]
/usr/sbin/mysqld(pfs_spawn_thread+0x12a)[0xae9b4a]
/usr/lib64/libpthread.so.0[0x3366207f33]
/usr/lib64/libc.so.6(clone+0x6d)[0x3365af4ded]

Trying to get some variables.
Some pointers may be invalid and cause the dump to abort.
Query (7f7354004f50): is an invalid pointer
Connection ID (thread ID): 3
Status: NOT_KILLED