Bug#37003 Tests sporadically crashes with embedded server

The problem was that when a embedded linked version of mysqltest
crashed there was no way to obtain a stack trace if no core file
is available. Another problem is that the embedded version of
libmysql was not behaving (crash) the same as the non-embedded with
respect to sending commands to a explicitly closed connection.

The solution is to generate a mysqltest's stack trace on crash
and to enable "reconnect" if the connection handle was explicitly
closed so the behavior matches the non-embedded one.

client/CMakeLists.txt

@@ -15,7 +15,7 @@
 INCLUDE("${PROJECT_SOURCE_DIR}/win/mysql_manifest.cmake")
 
 # We use the "mysqlclient_notls" library here just as safety, in case
-# any of the clients here would go beond the client API and access the
+# any of the clients here would go beyond the client API and access the
 # Thread Local Storage directly.
 
 SET(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -DSAFEMALLOC -DSAFE_MUTEX")
@@ -32,9 +32,9 @@ INCLUDE_DIRECTORIES(${CMAKE_SOURCE_DIR}/include
 ADD_EXECUTABLE(mysql completion_hash.cc mysql.cc readline.cc sql_string.cc ../mysys/my_conio.c)
 TARGET_LINK_LIBRARIES(mysql mysqlclient_notls wsock32)
 
-ADD_EXECUTABLE(mysqltest mysqltest.c ../mysys/my_getsystime.c
-               ../mysys/my_copy.c ../mysys/my_mkdir.c)
-TARGET_LINK_LIBRARIES(mysqltest mysqlclient_notls regex wsock32)
+ADD_EXECUTABLE(mysqltest mysqltest.c)
+SET_SOURCE_FILES_PROPERTIES(mysqltest.c PROPERTIES COMPILE_FLAGS "-DTHREADS")
+TARGET_LINK_LIBRARIES(mysqltest mysqlclient mysys regex wsock32 dbug)
 
 ADD_EXECUTABLE(mysqlcheck mysqlcheck.c)
 TARGET_LINK_LIBRARIES(mysqlcheck mysqlclient_notls wsock32)

client/Makefile.am

@@ -86,11 +86,13 @@ mysqlslap_LDADD =		$(CXXLDFLAGS) $(CLIENT_THREAD_LIBS) \
 				$(LIBMYSQLCLIENT_LA) \
 				$(top_builddir)/mysys/libmysys.a
 
-mysqltest_SOURCES=		mysqltest.c \
-				$(top_srcdir)/mysys/my_getsystime.c \
-				$(top_srcdir)/mysys/my_copy.c \
-                                $(top_srcdir)/mysys/my_mkdir.c
-mysqltest_LDADD =		$(top_builddir)/regex/libregex.a $(LDADD)
+mysqltest_SOURCES=		mysqltest.c
+mysqltest_CFLAGS=		-DTHREAD -UUNDEF_THREADS_HACK
+mysqltest_LDADD =		$(CXXLDFLAGS) $(CLIENT_THREAD_LIBS) \
+				@CLIENT_EXTRA_LDFLAGS@ \
+				$(LIBMYSQLCLIENT_LA) \
+				$(top_builddir)/mysys/libmysys.a \
+				$(top_builddir)/regex/libregex.a
 
 mysql_upgrade_SOURCES=          mysql_upgrade.c \
                                 $(top_srcdir)/mysys/my_getpagesize.c

client/mysqltest.c

@@ -48,7 +48,14 @@
 #ifdef __WIN__
 #include <direct.h>
 #endif
+#include <my_stacktrace.h>
 
+#ifdef __WIN__
+#include <crtdbg.h>
+#define SIGNAL_FMT "exception 0x%x"
+#else
+#define SIGNAL_FMT "signal %d"
+#endif
 
 /* Use cygwin for --exec and --system before 5.0 */
 #if MYSQL_VERSION_ID < 50000
@@ -214,6 +221,7 @@ struct st_connection
   /* Used when creating views and sp, to avoid implicit commit */
   MYSQL* util_mysql;
   char *name;
+  size_t name_len;
   MYSQL_STMT* stmt;
 
 #ifdef EMBEDDED_LIBRARY
@@ -4436,6 +4444,7 @@ void do_connect(struct st_command *command)
                         ds_connection_name.str));
     if (!(con_slot->name= my_strdup(ds_connection_name.str, MYF(MY_WME))))
       die("Out of memory");
+    con_slot->name_len= strlen(con_slot->name);
     cur_con= con_slot;
     
     if (con_slot == next_con)
@@ -6839,6 +6848,87 @@ void mark_progress(struct st_command* command __attribute__((unused)),
 }
 
 
+static sig_handler dump_backtrace(int sig)
+{
+  struct st_connection *conn= cur_con;
+
+  fprintf(stderr, "mysqltest got " SIGNAL_FMT "\n", sig);
+  my_safe_print_str("read_command_buf", read_command_buf,
+                    sizeof(read_command_buf));
+  if (conn)
+  {
+    my_safe_print_str("conn->name", conn->name, conn->name_len);
+#ifdef EMBEDDED_LIBRARY
+    my_safe_print_str("conn->cur_query", conn->cur_query, conn->cur_query_len);
+#endif
+  }
+  fputs("Attempting backtrace...\n", stderr);
+  my_print_stacktrace(NULL, my_thread_stack_size);
+}
+
+#ifdef __WIN__
+
+LONG WINAPI exception_filter(EXCEPTION_POINTERS *exp)
+{
+  __try
+  {
+    my_set_exception_pointers(exp);
+    dump_backtrace(exp->ExceptionRecord->ExceptionCode);
+  }
+  __except(EXCEPTION_EXECUTE_HANDLER)
+  {
+    fputs("Got exception in exception handler!\n", stderr);
+  }
+
+  return EXCEPTION_CONTINUE_SEARCH;
+}
+
+
+static void init_signal_handling(void)
+{
+  UINT mode;
+
+  /* Set output destination of messages to the standard error stream. */
+  _CrtSetReportMode(_CRT_WARN, _CRTDBG_MODE_FILE);
+  _CrtSetReportFile(_CRT_WARN, _CRTDBG_FILE_STDERR);
+  _CrtSetReportMode(_CRT_ERROR, _CRTDBG_MODE_FILE);
+  _CrtSetReportFile(_CRT_ERROR, _CRTDBG_FILE_STDERR);
+  _CrtSetReportMode(_CRT_ASSERT, _CRTDBG_MODE_FILE);
+  _CrtSetReportFile(_CRT_ASSERT, _CRTDBG_FILE_STDERR);
+
+  /* Do not not display the a error message box. */
+  mode= SetErrorMode(0) | SEM_FAILCRITICALERRORS | SEM_NOOPENFILEERRORBOX;
+  SetErrorMode(mode);
+
+  SetUnhandledExceptionFilter(exception_filter);
+}
+
+#else /* __WIN__ */
+
+static void init_signal_handling(void)
+{
+  struct sigaction sa;
+  DBUG_ENTER("init_signal_handling");
+
+  my_init_stacktrace();
+
+  sa.sa_flags = SA_RESETHAND | SA_NODEFER;
+  sigemptyset(&sa.sa_mask);
+  sigprocmask(SIG_SETMASK, &sa.sa_mask, NULL);
+
+  sa.sa_handler= dump_backtrace;
+
+  sigaction(SIGSEGV, &sa, NULL);
+  sigaction(SIGABRT, &sa, NULL);
+#ifdef SIGBUS
+  sigaction(SIGBUS, &sa, NULL);
+#endif
+  sigaction(SIGILL, &sa, NULL);
+  sigaction(SIGFPE, &sa, NULL);
+}
+
+#endif /* !__WIN__ */
+
 int main(int argc, char **argv)
 {
   struct st_command *command;
@@ -6851,6 +6941,8 @@ int main(int argc, char **argv)
   save_file[0]= 0;
   TMPDIR[0]= 0;
 
+  init_signal_handling();
+
   /* Init expected errors */
   memset(&saved_expected_errors, 0, sizeof(saved_expected_errors));
 

configure.in

@@ -2341,10 +2341,20 @@ then
 fi
 AC_MSG_RESULT("$netinet_inc")
 
+AC_CACHE_CHECK([support for weak symbols], mysql_cv_weak_symbol,
+[AC_TRY_LINK([],[
+  extern void __attribute__((weak)) foo(void);
+], [mysql_cv_weak_symbol=yes], [mysql_cv_weak_symbol=no])])
+
+if test "x$mysql_cv_weak_symbol" = xyes; then
+  AC_DEFINE(HAVE_WEAK_SYMBOL, 1,
+            [Define to 1 if compiler supports weak symbol attribute.])
+fi
+
 AC_LANG_SAVE
 AC_LANG_CPLUSPLUS
 AC_CHECK_HEADERS(cxxabi.h)
-AC_CACHE_CHECK([checking for abi::__cxa_demangle], mysql_cv_cxa_demangle,
+AC_CACHE_CHECK([for abi::__cxa_demangle], mysql_cv_cxa_demangle,
 [AC_TRY_LINK([#include <cxxabi.h>], [
   char *foo= 0; int bar= 0;
   foo= abi::__cxa_demangle(foo, foo, 0, &bar);

include/Makefile.am

@@ -36,7 +36,7 @@ noinst_HEADERS =	config-win.h config-netware.h my_bit.h \
 			mysql_version.h.in my_handler.h my_time.h \
 			my_vle.h my_user.h my_atomic.h atomic/nolock.h \
 			atomic/rwlock.h atomic/x86-gcc.h atomic/x86-msvc.h \
-			atomic/gcc_builtins.h my_libwrap.h
+			atomic/gcc_builtins.h my_libwrap.h my_stacktrace.h
 
 # Remove built files and the symlinked directories
 CLEANFILES =            $(BUILT_SOURCES) readline openssl

sql/stacktrace.h → include/my_stacktrace.h

@@ -13,57 +13,49 @@
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
 
-#ifdef	__cplusplus
-extern "C" {
+#ifndef _my_stacktrace_h_
+#define _my_stacktrace_h_
+
+#include <my_global.h>
+
+#ifdef TARGET_OS_LINUX
+#if defined (__x86_64__) || defined (__i386__) || \
+    (defined(__alpha__) && defined(__GNUC__))
+#define HAVE_STACKTRACE 1
+#endif
+#elif defined(__WIN__)
+#define HAVE_STACKTRACE 1
+#endif
+
+#if !defined(__NETWARE__)
+#define HAVE_WRITE_CORE
 #endif
 
-#if HAVE_BACKTRACE && HAVE_BACKTRACE_SYMBOLS && HAVE_CXXABI_H && HAVE_ABI_CXA_DEMANGLE
+#if HAVE_BACKTRACE && HAVE_BACKTRACE_SYMBOLS && \
+    HAVE_CXXABI_H && HAVE_ABI_CXA_DEMANGLE && \
+    HAVE_WEAK_SYMBOL
 #define BACKTRACE_DEMANGLE 1
 #endif
 
+C_MODE_START
+
+#if defined(HAVE_STACKTRACE) || defined(HAVE_BACKTRACE)
+void my_init_stacktrace();
+void my_print_stacktrace(uchar* stack_bottom, ulong thread_stack);
+void my_safe_print_str(const char* name, const char* val, int max_len);
+void my_write_core(int sig);
 #if BACKTRACE_DEMANGLE
 char *my_demangle(const char *mangled_name, int *status);
 #endif
-
-#ifdef TARGET_OS_LINUX
-#if defined(HAVE_STACKTRACE) || (defined (__x86_64__) || defined (__i386__) || (defined(__alpha__) && defined(__GNUC__)))
-#undef HAVE_STACKTRACE
-#define HAVE_STACKTRACE
-
-extern char* __bss_start;
-extern char* heap_start;
-
-#define init_stacktrace() do {                                 \
-                            heap_start = (char*) &__bss_start; \
-                          } while(0);
-void check_thread_lib(void);
-#endif /* defined (__i386__) || (defined(__alpha__) && defined(__GNUC__))) */
-#elif defined (__WIN__)
-#define HAVE_STACKTRACE
-extern void set_exception_pointers(EXCEPTION_POINTERS *ep);
-#define init_stacktrace() {}
+#ifdef __WIN__
+void my_set_exception_pointers(EXCEPTION_POINTERS *ep);
 #endif
-
-#ifdef HAVE_STACKTRACE
-void print_stacktrace(uchar* stack_bottom, ulong thread_stack);
-void safe_print_str(const char* name, const char* val, int max_len);
-#else
-/* Define empty prototypes for functions that are not implemented */
-#define init_stacktrace() {}
-#define print_stacktrace(A,B) {}
-#define safe_print_str(A,B,C) {}
-#endif /* HAVE_STACKTRACE */
-
-
-#if !defined(__NETWARE__)
-#define HAVE_WRITE_CORE
 #endif
 
 #ifdef HAVE_WRITE_CORE
-void write_core(int sig);
+void my_write_core(int sig);
 #endif
 
+C_MODE_END
 
-#ifdef	__cplusplus
-}
-#endif
+#endif /* _my_stacktrace_h_ */

libmysqld/CMakeLists.txt

@@ -185,8 +185,7 @@ SET(LIBMYSQLD_SOURCES emb_qcache.cc libmysqld.c lib_sql.cc
            ../sql/strfunc.cc ../sql/table.cc ../sql/thr_malloc.cc
            ../sql/time.cc ../sql/tztime.cc ../sql/uniques.cc ../sql/unireg.cc
            ../sql/partition_info.cc ../sql/sql_connect.cc 
-           ../sql/scheduler.cc ../sql/stacktrace.c
-           ../sql/event_parse_data.cc
+           ../sql/scheduler.cc ../sql/event_parse_data.cc
            ${GEN_SOURCES}
            ${LIB_SOURCES})
 

libmysqld/Makefile.am

@@ -69,7 +69,7 @@ sqlsources = derror.cc field.cc field_conv.cc strfunc.cc filesort.cc \
 	sql_select.cc sql_do.cc sql_show.cc set_var.cc \
 	sql_string.cc sql_table.cc sql_test.cc sql_udf.cc \
 	sql_update.cc sql_yacc.cc table.cc thr_malloc.cc time.cc \
-	unireg.cc uniques.cc stacktrace.c sql_union.cc hash_filo.cc \
+	unireg.cc uniques.cc sql_union.cc hash_filo.cc \
 	spatial.cc gstream.cc sql_help.cc tztime.cc sql_cursor.cc \
 	sp_head.cc sp_pcontext.cc sp.cc sp_cache.cc sp_rcontext.cc \
 	parse_file.cc sql_view.cc sql_trigger.cc my_decimal.cc \

libmysqld/lib_sql.cc

@@ -79,6 +79,15 @@ emb_advanced_command(MYSQL *mysql, enum enum_server_command command,
   my_bool result= 1;
   THD *thd=(THD *) mysql->thd;
   NET *net= &mysql->net;
+  my_bool stmt_skip= stmt ? stmt->state != MYSQL_STMT_INIT_DONE : FALSE;
+
+  if (!thd)
+  {
+    /* Do "reconnect" if possible */
+    if (mysql_reconnect(mysql) || stmt_skip)
+      return 1;
+    thd= (THD *) mysql->thd;
+  }
 
 #if defined(ENABLED_PROFILING) && defined(COMMUNITY_SERVER)
   thd->profiling.start_new_query();

mysql-test/t/sql_low_priority_updates_func.test

@@ -19,6 +19,7 @@
 #                                                                             #
 ###############################################################################
 
+--source include/not_embedded.inc
 
 ################################################################
 # sql_low_priority_updates was renamed to low_priority_updates #

mysys/CMakeLists.txt

@@ -39,7 +39,7 @@ SET(MYSYS_SOURCES  array.c charset-def.c charset.c checksum.c default.c default_
 				my_mkdir.c my_mmap.c my_net.c my_once.c my_open.c my_pread.c my_pthread.c 
 				my_quick.c my_read.c my_realloc.c my_redel.c my_rename.c my_seek.c my_sleep.c
 				my_static.c my_symlink.c my_symlink2.c my_sync.c my_thr_init.c my_wincond.c
-				my_windac.c my_winthread.c my_write.c ptr_cmp.c queues.c
+				my_windac.c my_winthread.c my_write.c ptr_cmp.c queues.c stacktrace.c
 				rijndael.c safemalloc.c sha1.c string.c thr_alarm.c thr_lock.c thr_mutex.c
 				thr_rwlock.c tree.c typelib.c my_vle.c base64.c my_memmem.c my_getpagesize.c)
 

mysys/Makefile.am

@@ -51,7 +51,7 @@ libmysys_a_SOURCES =    my_init.c my_getwd.c mf_getdate.c my_mmap.c \
 			charset.c charset-def.c my_bitmap.c my_bit.c md5.c \
 			my_gethostbyname.c rijndael.c my_aes.c sha1.c \
 			my_handler.c my_netware.c my_largepage.c \
-			my_memmem.c \
+			my_memmem.c stacktrace.c \
 			my_windac.c my_access.c base64.c my_libwrap.c
 EXTRA_DIST =		thr_alarm.c thr_lock.c my_pthread.c my_thr_init.c \
 			thr_mutex.c thr_rwlock.c \

sql/stacktrace.c → mysys/stacktrace.c

@@ -17,7 +17,7 @@
 #define DONT_DEFINE_VOID 1
 
 #include <my_global.h>
-#include "stacktrace.h"
+#include <my_stacktrace.h>
 
 #ifndef __WIN__
 #include <signal.h>
@@ -33,16 +33,22 @@
 
 #define PTR_SANE(p) ((p) && (char*)(p) >= heap_start && (char*)(p) <= heap_end)
 
-char *heap_start;
+static char *heap_start;
+extern char *__bss_start;
 
-void safe_print_str(const char* name, const char* val, int max_len)
+void my_init_stacktrace()
+{
+  heap_start = (char*) &__bss_start;
+}
+
+void my_safe_print_str(const char* name, const char* val, int max_len)
 {
   char *heap_end= (char*) sbrk(0);
   fprintf(stderr, "%s at %p ", name, val);
 
   if (!PTR_SANE(val))
   {
-    fprintf(stderr, " is invalid pointer\n");
+    fprintf(stderr, "is an invalid pointer\n");
     return;
   }
 
@@ -103,6 +109,12 @@ inline uint32* find_prev_pc(uint32* pc, uchar** fp)
 #endif /* defined(__alpha__) && defined(__GNUC__) */
 
 #if BACKTRACE_DEMANGLE
+
+char __attribute__ ((weak)) *my_demangle(const char *mangled_name, int *status)
+{
+  return NULL;
+}
+
 static void my_demangle_symbols(char **addrs, int n)
 {
   int status, i;
@@ -158,7 +170,7 @@ static void backtrace_current_thread(void)
 #endif
 
 
-void  print_stacktrace(uchar* stack_bottom, ulong thread_stack)
+void my_print_stacktrace(uchar* stack_bottom, ulong thread_stack)
 {
 #if HAVE_BACKTRACE
   backtrace_current_thread();
@@ -281,16 +293,7 @@ void  print_stacktrace(uchar* stack_bottom, ulong thread_stack)
 #endif /* HAVE_STACKTRACE */
 
 /* Produce a core for the thread */
-
-#ifdef NOT_USED /* HAVE_LINUXTHREADS */
-void write_core(int sig)
-{
-  signal(sig, SIG_DFL);
-  if (fork() != 0) exit(1);			/* Abort main program */
-  /* Core will be written at exit */
-}
-#else
-void write_core(int sig)
+void my_write_core(int sig)
 {
   signal(sig, SIG_DFL);
 #ifdef HAVE_gcov
@@ -308,7 +311,7 @@ void write_core(int sig)
   sigsend(P_PID,P_MYID,sig);
 #endif
 }
-#endif
+
 #else /* __WIN__*/
 
 #include <dbghelp.h>
@@ -356,6 +359,10 @@ static EXCEPTION_POINTERS *exception_ptrs;
 #define MODULE64_SIZE_WINXP 576
 #define STACKWALK_MAX_FRAMES 64
 
+void my_init_stacktrace()
+{
+}
+
 /*
   Dynamically load dbghelp functions
 */
@@ -395,7 +402,7 @@ BOOL init_dbghelp_functions()
   return rc;
 }
 
-void set_exception_pointers(EXCEPTION_POINTERS *ep)
+void my_set_exception_pointers(EXCEPTION_POINTERS *ep)
 {
   exception_ptrs = ep;
 }
@@ -405,7 +412,7 @@ void set_exception_pointers(EXCEPTION_POINTERS *ep)
 #define SYMOPT_NO_PROMPTS 0
 #endif
 
-void print_stacktrace(uchar* unused1, ulong unused2)
+void my_print_stacktrace(uchar* unused1, ulong unused2)
 {
   HANDLE  hProcess= GetCurrentProcess();
   HANDLE  hThread= GetCurrentThread();
@@ -513,7 +520,7 @@ void print_stacktrace(uchar* unused1, ulong unused2)
   file name is constructed from executable name plus
   ".dmp" extension
 */
-void write_core(int unused)
+void my_write_core(int unused)
 {
   char path[MAX_PATH];
   char dump_fname[MAX_PATH]= "core.dmp";
@@ -560,7 +567,7 @@ void write_core(int unused)
 }
 
 
-void safe_print_str(const char *name, const char *val, int len)
+void my_safe_print_str(const char *name, const char *val, int len)
 {
   fprintf(stderr,"%s at %p", name, val);
   __try 

sql/CMakeLists.txt

@@ -43,7 +43,7 @@ ADD_DEFINITIONS(-DMYSQL_SERVER -D_CONSOLE -DHAVE_DLOPEN -DHAVE_EVENT_SCHEDULER)
 
 ADD_EXECUTABLE(mysqld
                ../sql-common/client.c derror.cc des_key_file.cc
-               discover.cc ../libmysql/errmsg.c field.cc  stacktrace.c stacktrace.h field_conv.cc 
+               discover.cc ../libmysql/errmsg.c field.cc  field_conv.cc 
                filesort.cc gstream.cc
                ha_partition.cc
                handler.cc hash_filo.cc hash_filo.h 

sql/Makefile.am

@@ -66,7 +66,7 @@ noinst_HEADERS =	item.h item_func.h item_sum.h item_cmpfunc.h \
 			sql_repl.h slave.h rpl_filter.h rpl_injector.h \
 			log_event.h rpl_record.h \
 			log_event_old.h rpl_record_old.h \
-			stacktrace.h sql_sort.h sql_cache.h set_var.h \
+			sql_sort.h sql_cache.h set_var.h \
 			spatial.h gstream.h client_settings.h tzfile.h \
 			tztime.h my_decimal.h\
 			sp_head.h sp_pcontext.h sp_rcontext.h sp.h sp_cache.h \
@@ -110,7 +110,7 @@ mysqld_SOURCES =	sql_lex.cc sql_handler.cc sql_partition.cc \
 			rpl_reporting.cc \
                         sql_union.cc sql_derived.cc \
 			sql_client.cc \
-			stacktrace.c repl_failsafe.h repl_failsafe.cc \
+			repl_failsafe.h repl_failsafe.cc \
 			sql_olap.cc sql_view.cc \
 			gstream.cc spatial.cc sql_help.cc sql_cursor.cc \
 			tztime.cc my_decimal.cc\

sql/mysqld.cc

@@ -22,7 +22,7 @@
 #include "sql_repl.h"
 #include "rpl_filter.h"
 #include "repl_failsafe.h"
-#include "stacktrace.h"
+#include <my_stacktrace.h>
 #include "mysqld_suffix.h"
 #include "mysys_err.h"
 #include "events.h"
@@ -2049,7 +2049,7 @@ LONG WINAPI my_unhandler_exception_filter(EXCEPTION_POINTERS *ex_pointers)
 #endif /* DEBUG_UNHANDLED_EXCEPTION_FILTER */
   __try
   {
-    set_exception_pointers(ex_pointers);
+    my_set_exception_pointers(ex_pointers);
     handle_segfault(ex_pointers->ExceptionRecord->ExceptionCode);
   }
   __except(EXCEPTION_EXECUTE_HANDLER)
@@ -2432,8 +2432,8 @@ the thread stack. Please read http://dev.mysql.com/doc/mysql/en/linux.html\n\n",
 Attempting backtrace. You can use the following information to find out\n\
 where mysqld died. If you see no messages after this, something went\n\
 terribly wrong...\n");  
-    print_stacktrace(thd ? (uchar*) thd->thread_stack : (uchar*) 0,
-                     my_thread_stack_size);
+    my_print_stacktrace(thd ? (uchar*) thd->thread_stack : NULL,
+                        my_thread_stack_size);
   }
   if (thd)
   {
@@ -2457,7 +2457,7 @@ terribly wrong...\n");
     }
     fprintf(stderr, "Trying to get some variables.\n\
 Some pointers may be invalid and cause the dump to abort...\n");
-    safe_print_str("thd->query", thd->query, 1024);
+    my_safe_print_str("thd->query", thd->query, 1024);
     fprintf(stderr, "thd->thread_id=%lu\n", (ulong) thd->thread_id);
     fprintf(stderr, "thd->killed=%s\n", kreason);
   }
@@ -2504,7 +2504,7 @@ bugs.\n");
   {
     fprintf(stderr, "Writing a core file\n");
     fflush(stderr);
-    write_core(sig);
+    my_write_core(sig);
   }
 #endif
 
@@ -2538,7 +2538,7 @@ static void init_signals(void)
     sigemptyset(&sa.sa_mask);
     sigprocmask(SIG_SETMASK,&sa.sa_mask,NULL);
 
-    init_stacktrace();
+    my_init_stacktrace();
 #if defined(__amiga__)
     sa.sa_handler=(void(*)())handle_segfault;
 #else