Index: e2fsprogs-1.40.4/lib/et/com_err.pc.in
===================================================================
--- e2fsprogs-1.40.4.orig/lib/et/com_err.pc.in
+++ e2fsprogs-1.40.4/lib/et/com_err.pc.in
@@ -7,5 +7,5 @@ Name: com_err
 Description: Common error description library
 Version: @E2FSPROGS_VERSION@
 Requires:
-Cflags: -I${includedir} 
-Libs: -L${libdir} -lcom_err
+Cflags: -I${includedir} -pthread
+Libs: -L${libdir} -lcom_err -pthread
Index: e2fsprogs-1.40.4/lib/et/error_message.c
===================================================================
--- e2fsprogs-1.40.4.orig/lib/et/error_message.c
+++ e2fsprogs-1.40.4/lib/et/error_message.c
@@ -20,6 +20,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <errno.h>
+#include <pthread.h>
 #ifdef HAVE_SYS_PRCTL_H
 #include <sys/prctl.h>
 #else
@@ -41,6 +42,17 @@
 struct et_list * _et_list = (struct et_list *) NULL;
 struct et_list * _et_dynamic_list = (struct et_list *) NULL;
 
+static pthread_mutex_t   _et_lock  = PTHREAD_MUTEX_INITIALIZER;
+
+int          et_list_lock()
+{
+    return pthread_mutex_lock(&_et_lock);
+}
+
+int          et_list_unlock()
+{
+    return pthread_mutex_unlock(&_et_lock);
+}
 
 const char * error_message (errcode_t code)
 {
@@ -66,22 +78,32 @@ const char * error_message (errcode_t co
 	    goto oops;
 #endif
     }
+    et_list_lock();
     for (et = _et_list; et; et = et->next) {
 	if ((et->table->base & 0xffffffL) == (table_num & 0xffffffL)) {
 	    /* This is the right table */
-	    if (et->table->n_msgs <= offset)
-		goto oops;
-	    return(et->table->msgs[offset]);
+	    if (et->table->n_msgs <= offset) {
+		break;
+	    } else {
+		const char *msg = et->table->msgs[offset];
+		et_list_unlock();
+		return(msg);
+	    }
 	}
     }
     for (et = _et_dynamic_list; et; et = et->next) {
 	if ((et->table->base & 0xffffffL) == (table_num & 0xffffffL)) {
 	    /* This is the right table */
-	    if (et->table->n_msgs <= offset)
-		goto oops;
-	    return(et->table->msgs[offset]);
+	    if (et->table->n_msgs <= offset) {
+		break;
+	    } else {
+		const char *msg = et->table->msgs[offset];
+		et_list_unlock();
+		return(msg);
+	    }
 	}
     }
+    et_list_unlock();
 oops:
     return "Unknown code";
 }
@@ -150,6 +172,9 @@ errcode_t add_error_table(const struct e
 	if (!(el = (struct et_list *) malloc(sizeof(struct et_list))))
 		return ENOMEM;
 
+	if( 0 != et_list_lock())
+	    return errno;
+
 	el->table = et;
 	el->next = _et_dynamic_list;
 	_et_dynamic_list = el;
@@ -160,6 +185,7 @@ errcode_t add_error_table(const struct e
 			error_table_name(et->base),
 			(const void *) et);
 
+	et_list_unlock();
 	return 0;
 }
 
@@ -168,9 +194,13 @@ errcode_t add_error_table(const struct e
  */
 errcode_t remove_error_table(const struct error_table * et)
 {
-	struct et_list *el = _et_dynamic_list;
+	struct et_list *el;
 	struct et_list *el2 = 0;
 
+	if( 0 != et_list_lock())
+	    return ENOENT;
+
+	el = _et_dynamic_list;
 	init_debug();
 	while (el) {
 		if (el->table->base == et->base) {
@@ -184,6 +214,7 @@ errcode_t remove_error_table(const struc
 					"remove_error_table: %s (0x%p)\n",
 					error_table_name(et->base),
 					(const void *) et);
+			et_list_unlock();
 			return 0;
 		}
 		el2 = el;
@@ -193,6 +224,7 @@ errcode_t remove_error_table(const struc
 		fprintf(debug_f, "remove_error_table FAILED: %s (0x%p)\n",
 			error_table_name(et->base),
 			(const void *) et);
+	et_list_unlock();
 	return ENOENT;
 }
 
Index: e2fsprogs-1.40.4/lib/et/error_table.h
===================================================================
--- e2fsprogs-1.40.4.orig/lib/et/error_table.h
+++ e2fsprogs-1.40.4/lib/et/error_table.h
@@ -19,6 +19,8 @@ struct et_list {
     const struct error_table *table;
 };
 extern struct et_list * _et_list;
+extern int               et_list_lock(void);
+extern int               et_list_unlock(void);
 
 #define	ERRCODE_RANGE	8	/* # of bits to shift table number */
 #define	BITS_PER_CHAR	6	/* # bits to shift per character in name */
Index: e2fsprogs-1.40.4/lib/et/et_c.awk
===================================================================
--- e2fsprogs-1.40.4.orig/lib/et/et_c.awk
+++ e2fsprogs-1.40.4/lib/et/et_c.awk
@@ -225,6 +225,8 @@ END {
 	print "    const struct error_table * table;" > outfile
 	print "};" > outfile
 	print "extern struct et_list *_et_list;" > outfile
+	print "extern int              et_list_lock();" > outfile
+	print "extern int              et_list_unlock();" > outfile
 	print "" > outfile
 	if (tab_base_high == 0) {
 		print "const struct error_table et_" table_name "_error_table = { text, " \
@@ -242,7 +244,22 @@ END {
 	print "void initialize_" table_name "_error_table(void);" > outfile
 	print "" > outfile
 	print "void initialize_" table_name "_error_table(void) {" > outfile
-	print "    initialize_" table_name "_error_table_r(&_et_list);" > outfile
+	print "    if(0 == et_list_lock()) {" > outfile
+	print "        if ( !link.table) {" > outfile
+	print "            struct et_list *el = _et_list;" > outfile
+	print "            while (el) {" > outfile
+	print "                if (el->table->base == et_" table_name "_error_table.base) {" > outfile
+	print "                    et_list_unlock();" > outfile
+	print "                    return;" > outfile
+	print "                }" > outfile
+	print "                el = el->next;" > outfile
+	print "            }" > outfile
+	print "            link.next = _et_list;" > outfile
+	print "            link.table = &et_" table_name "_error_table;" > outfile
+	print "            _et_list = &link;" > outfile
+	print "        }" > outfile
+	print "        et_list_unlock();" > outfile
+	print "    }" > outfile
 	print "}" > outfile
 	print "" > outfile
 	print "/* For Heimdal compatibility */" > outfile
@@ -255,9 +272,6 @@ END {
 	print "            return;" > outfile
 	print "    et = malloc(sizeof(struct et_list));" > outfile
 	print "    if (et == 0) {" > outfile
-	print "        if (!link.table)" > outfile
-	print "            et = &link;" > outfile
-	print "        else" > outfile
 	print "            return;" > outfile
 	print "    }" > outfile
 	print "    et->table = &et_" table_name "_error_table;" > outfile