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[Valerii Kravchuk <valerii.kravchuk@xxxxxxxxxxx>]

Public bug reported:

Try the following SELECT on any debug build of Percona Server 5.6.x:

openxs@ao756:~/dbs/p5.6$ bin/mysql -uroot test
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.6.15-62.0-debug MySQL Community Server (GPL)

Copyright (c) 2009-2013 Percona LLC and/or its affiliates
Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input
statement.

mysql> select table_schema,table_name,column_name,column_type from information_schema.columns where table_name in ( 'ooooooooooooooooooooooooooooooooooooo' 'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa ' 'bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb cc' 'ccccccccccccc' 'wwwwwwwwwwwwwwwwwww' 'rrrrrrrrrrrrrrrr' 'tttttttttttttttttttt' 'yyyyyyyyyyyyyyyyyyy' 'uuuuuuuuuuuuuuuuuuuuuuuuuuuu' 'iiiiiiiiiiiiiiiiiiiiiiiiiiiiii' 'oooooooooooooooooooo' 'ppppppppppppppppppppppppppppp' 'jjjjjjjjjjjj' 'kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk' 'lllllllllllllllllllllllllllllllllllllll' 'zzzzzzzzzzzzzzz' 'xxxxxxxxxxxxxxxxx' 'cccccccccc' 'vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv' 'bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb' 'nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn' ) and table_schema='AA_BBB' and column_type='PRI' order by 2;
ERROR 2013 (HY000): Lost connection to MySQL server during query
mysql> 140228 17:28:42 mysqld_safe Number of processes running now: 0
140228 17:28:42 mysqld_safe mysqld restarted

mysql> exit
Bye

In the error log you'll see:

mysqld: /home/openxs/bzr/percona-5.6/sql/mdl.h:348: void MDL_key::mdl_key_init(MDL_key::enum_mdl_namespace, const char*, const char*): Assertion `strlen(db) <= (64*3) && strlen(name) <= (64*3)' failed.
15:28:42 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 Server better by reporting any
bugs at http://bugs.percona.com/

key_buffer_size=8388608
read_buffer_size=131072
max_used_connections=1
max_threads=153
thread_count=1
connection_count=1
It is possible that mysqld could use up to
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 68943 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x2e3d270
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 = 7f6ea02a2e48 thread_stack 0x40000
/home/openxs/dbs/p5.6/bin/mysqld(my_print_stacktrace+0x38)[0xa99316]
/home/openxs/dbs/p5.6/bin/mysqld(handle_fatal_signal+0x429)[0x706005]
/lib/x86_64-linux-gnu/libpthread.so.0(+0xfbd0)[0x7f6ea3e3dbd0]
/lib/x86_64-linux-gnu/libc.so.6(gsignal+0x37)[0x7f6ea327e037]
/lib/x86_64-linux-gnu/libc.so.6(abort+0x148)[0x7f6ea3281698]
/lib/x86_64-linux-gnu/libc.so.6(+0x2fe03)[0x7f6ea3276e03]
/lib/x86_64-linux-gnu/libc.so.6(+0x2feb2)[0x7f6ea3276eb2]
/home/openxs/dbs/p5.6/bin/mysqld(_ZN7MDL_key12mdl_key_initENS_18enum_mdl_namespaceEPKcS2_+0x6a)[0x6f4c3e]
/home/openxs/dbs/p5.6/bin/mysqld(_ZN11MDL_request4initEN7MDL_key18enum_mdl_namespaceEPKcS3_13enum_mdl_type17enum_mdl_duration+0x39)[0x6f1b81]
/home/openxs/dbs/p5.6/bin/mysqld[0x80bd5b]
/home/openxs/dbs/p5.6/bin/mysqld[0x80bf8a]
/home/openxs/dbs/p5.6/bin/mysqld(_Z14get_all_tablesP3THDP10TABLE_LISTP4Item+0x95f)[0x80ce09]
/home/openxs/dbs/p5.6/bin/mysqld[0x81b566]
/home/openxs/dbs/p5.6/bin/mysqld(_Z24get_schema_tables_resultP4JOIN23enum_schema_table_state+0x302)[0x81b951]
/home/openxs/dbs/p5.6/bin/mysqld(_ZN4JOIN14prepare_resultEPP4ListI4ItemE+0xe9)[0x7ec44d]
/home/openxs/dbs/p5.6/bin/mysqld(_ZN4JOIN4execEv+0x208)[0x788a20]
/home/openxs/dbs/p5.6/bin/mysqld[0x7ecf96]
/home/openxs/dbs/p5.6/bin/mysqld(_Z12mysql_selectP3THDP10TABLE_LISTjR4ListI4ItemEPS4_P10SQL_I_ListI8st_orderESB_S7_yP13select_resultP18st_select_lex_unitP13st_select_lex+0x24c)[0x7ed298]
/home/openxs/dbs/p5.6/bin/mysqld(_Z13handle_selectP3THDP13select_resultm+0x1c4)[0x7eb106]
/home/openxs/dbs/p5.6/bin/mysqld[0x7c2a41]
/home/openxs/dbs/p5.6/bin/mysqld(_Z21mysql_execute_commandP3THD+0xd57)[0x7bae19]
/home/openxs/dbs/p5.6/bin/mysqld(_Z11mysql_parseP3THDPcjP12Parser_state+0x578)[0x7c539b]
/home/openxs/dbs/p5.6/bin/mysqld(_Z16dispatch_command19enum_server_commandP3THDPcj+0xc52)[0x7b79a7]
/home/openxs/dbs/p5.6/bin/mysqld(_Z10do_commandP3THD+0x369)[0x7b6903]
/home/openxs/dbs/p5.6/bin/mysqld(_Z24do_handle_one_connectionP3THD+0x1cc)[0x77ed60]
/home/openxs/dbs/p5.6/bin/mysqld(handle_one_connection+0x20)[0x77e866]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x7f8e)[0x7f6ea3e35f8e]
/lib/x86_64-linux-gnu/libc.so.6(clone+0x6d)[0x7f6ea3341a0d]

Trying to get some variables.
Some pointers may be invalid and cause the dump to abort.
Query (7f6e5c004c30): select table_schema,table_name,column_name,column_type from information_schema.columns where table_name in ( 'ooooooooooooooooooooooooooooooooooooo' 'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa ' 'bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb cc' 'ccccccccccccc' 'wwwwwwwwwwwwwwwwwww' 'rrrrrrrrrrrrrrrr' 'tttttttttttttttttttt' 'yyyyyyyyyyyyyyyyyyy' 'uuuuuuuuuuuuuuuuuuuuuuuuuuuu' 'iiiiiiiiiiiiiiiiiiiiiiiiiiiiii' 'oooooooooooooooooooo' 'ppppppppppppppppppppppppppppp' 'jjjjjjjjjjjj' 'kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk' 'lllllllllllllllllllllllllllllllllllllll' 'zzzzzzzzzzzzzzz' 'xxxxxxxxxxxxxxxxx' 'cccccccccc' 'vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv' 'bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb' 'nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn' ) and table_schema='AA_BBB' and column_type='PRI' order by 2
Connection ID (thread ID): 1
Status: NOT_KILLED

** Affects: mysql-server
     Importance: Unknown
         Status: Unknown

** Affects: percona-server
     Importance: Undecided
         Status: Confirmed

** Affects: percona-server/5.1
     Importance: Undecided
         Status: Invalid

** Affects: percona-server/5.5
     Importance: Undecided
         Status: Invalid

** Affects: percona-server/5.6
     Importance: Undecided
         Status: Confirmed


** Tags: upstream

** Also affects: percona-server/5.1
   Importance: Undecided
       Status: New

** Also affects: percona-server/5.6
   Importance: Undecided
       Status: New

** Also affects: percona-server/5.5
   Importance: Undecided
       Status: New

** Changed in: percona-server/5.1
       Status: New => Invalid

** Changed in: percona-server/5.5
       Status: New => Invalid

** Changed in: percona-server/5.6
       Status: New => Confirmed

** Tags added: upstream

** Bug watch added: MySQL Bug System #71858
   http://bugs.mysql.com/bug.php?id=71858

** Also affects: mysql-server via
   http://bugs.mysql.com/bug.php?id=71858
   Importance: Unknown
       Status: Unknown

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https://bugs.launchpad.net/bugs/1286186

Title:
  Percona Server 5.6 fails with debug assertion for a specific SELECT
  from INFORMATION_SCHEMA

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