Dear All, We are running RHEL4 Update 4 AS IA-64 on a HP rx6600. We are running programs compiled in RHEL4 Update 4 AS in i386 architecture using the emul library(Intel IA-32 Execution Layer ) [admin at corviewsecondary ~]$ service ia32el status Intel IA-32 Execution Layer in use When we attempt to run a program using /usr/bin/gdb we are not able to hit the break point set. [admin at corviewsecondary ~]$ file /usr/bin/gdb /usr/bin/gdb: ELF 64-bit LSB executable, IA-64, version 1 (SYSV), for GNU/Linux 2.4.0, dynamically linked (uses shared libs), stripped [admin at corviewsecondary ~]$ /usr/bin/gdb ./loopTest GNU gdb Red Hat Linux (6.3.0.0-1.132.EL4rh) Copyright 2004 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as "ia64-redhat-linux-gnu"...Using host libthread_db library "/lib/tls/libthread_db.so.1". (gdb) b main warning: Can't fetch instructions for slot numbers greater than 2. Using slot 0 instead Breakpoint 1 at 0x8048384: file loopTest.c, line 6. (gdb) r But the breakpoint does not get hit. We tried using the /emul/ia32-linux/usr/bin/gdb. But the program does not run. [admin at corviewsecondary ~]$ file /emul/ia32-linux/usr/bin/gdb /emul/ia32-linux/usr/bin/gdb: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), for GNU/Linux 2.2.5, dynamically linked (uses shared libs), stripped [admin at corviewsecondary ~]$ /emul/ia32-linux/usr/bin/gdb loopTest GNU gdb Red Hat Linux (6.3.0.0-1.132.EL4rh) Copyright 2004 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as "i386-redhat-linux-gnu"...Using host libthread_db library "/emul/ia32-linux/lib/tls/libthread_db.so.1". (gdb) b main Breakpoint 1 at 0x8048384: file loopTest.c, line 6. (gdb) r Starting program: /home/admin/loopTest Killed We need the following details 1. How to run a i386 compiled program in IA64 bit environment using gdb and be able to hit break points? 2.How do we catch a running process in gdb and apply a breakpoint in our setup. The code of C program in question is given below #include <stdio.h> int count=0; void printString(); int main() { printf("unlock\n"); while(1) { //do nothing printString(); //break; } return 0; } void printString() { count++; printf("count = %d\n",count); return; } The above c code compiled in i386 environment and the IA64 bit server in which we are running this program are attached. Thanks in Advance, -S.Balaji