Bug#43827 Server closes connections and restarts

Problem:
  Crash happened with a user-defined utf8 collation,
  on attempt to insert a value longer than the column
  to store.
Reason:
  The "ctype" member was not initialized (NULL) when
  allocating a user-defined utf8 collation, so an attempt
  to call my_ctype(cs, *str) to check if we loose any important
  data when truncating the value made the server crash.
Fix:
  Initializing tge "ctype" member to a proper value.


mysql-test/r/ctype_ldml.result
  Adding tests

mysql-test/t/ctype_ldml.test
  Adding tests

strings/ctype-uca.c
  Adding initialization of "ctype" member.

modified:
  mysql-test/r/ctype_ldml.result
  mysql-test/t/ctype_ldml.test
  strings/ctype-uca.c

mysql-test/r/ctype_ldml.result

@@ -40,6 +40,14 @@ abcd	abcd
 efgh	efgh
 ijkl	ijkl
 DROP TABLE t1;
+#
+# Bug#43827 Server closes connections and restarts
+#
+CREATE TABLE t1 (c1 VARCHAR(10) CHARACTER SET utf8 COLLATE utf8_test_ci);
+INSERT INTO t1 SELECT REPEAT('a',11);
+Warnings:
+Warning	1265	Data truncated for column 'c1' at row 1
+DROP TABLE t1;
 show collation like 'ucs2_vn_ci';
 Collation	Charset	Id	Default	Compiled	Sortlen
 ucs2_vn_ci	ucs2	242			8

mysql-test/t/ctype_ldml.test

@@ -37,6 +37,15 @@ UPDATE t1 SET col2=col1;
 SELECT * FROM t1 WHERE col1=col2 ORDER BY col1;
 DROP TABLE t1;
 
+--echo #
+--echo # Bug#43827 Server closes connections and restarts
+--echo #
+# Crash happened with a user-defined utf8 collation,
+# on attempt to insert a string longer than the column can store.
+CREATE TABLE t1 (c1 VARCHAR(10) CHARACTER SET utf8 COLLATE utf8_test_ci);
+INSERT INTO t1 SELECT REPEAT('a',11);
+DROP TABLE t1;
+
 #
 #  Vietnamese experimental collation
 #

strings/ctype-uca.c

@@ -7992,6 +7992,7 @@ static my_bool create_tailoring(CHARSET_INFO *cs, void *(*alloc)(size_t))
 static my_bool my_coll_init_uca(CHARSET_INFO *cs, void *(*alloc)(size_t))
 {
   cs->pad_char= ' ';
+  cs->ctype= my_charset_utf8_unicode_ci.ctype;
   return create_tailoring(cs, alloc);
 }