Assertion failed: warn_item, file item_cmpfunc.cc, line 3613

[sbester]

Version: '5.5.24-MariaDB-debug' socket: '' port: 3306 MariaDB Server
Assertion failed: warn_item, file item_cmpfunc.cc, line 3613

mysqld.exe!my_sigabrt_handler()[my_thr_init.c:504]
mysqld.exe!raise()[winsig.c:586]
mysqld.exe!abort()[abort.c:74]
mysqld.exe!_wassert()[assert.c:153]
mysqld.exe!cmp_item::get_comparator()[item_cmpfunc.cc:3613]
mysqld.exe!Item_func_in::fix_length_and_dec()[item_cmpfunc.cc:4065]
mysqld.exe!Item_func::fix_fields()[item_func.cc:230]
mysqld.exe!Item_func_in::fix_fields()[item_cmpfunc.cc:3860]
mysqld.exe!setup_fields()[sql_base.cc:8039]
mysqld.exe!mysql_do()[sql_do.cc:31]
mysqld.exe!mysql_execute_command()[sql_parse.cc:2207]
mysqld.exe!mysql_parse()[sql_parse.cc:5731]
mysqld.exe!dispatch_command()[sql_parse.cc:1055]
mysqld.exe!do_command()[sql_parse.cc:794]
mysqld.exe!do_handle_one_connection()[sql_connect.cc:1253]
mysqld.exe!handle_one_connection()[sql_connect.cc:1168]
mysqld.exe!pthread_start()[my_winthread.c:60]
mysqld.exe!_callthreadstartex()[threadex.c:314]
mysqld.exe!_threadstartex()[threadex.c:297]

Repeated on maria-5.5 revno 3426

How to repeat
-----------------
#on debug build, run either of these statements:

set names swe7; do ('' in ('',convert('',time),1));
set names sjis;do ('' in ('',convert('',time),1));

[Elena Stepanova (elenst)]

Reproducible on maria/5.5.
Not reproducible on maria/5.1-5.3 or mysql-5.1-5.6 (maybe because there is no assertion there).
No visible problem apart from warnings "Truncated incorrect time value" on a release build.

[Elena Stepanova (elenst)]

Also filed in JIRA as https://mariadb.atlassian.net/browse/MDEV-316