From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.4) Gecko/20030624 Description of problem: 32bit applications can't see more then 2.5Gb or ram when run on AMD64-RHEL. The shell is tcsh. If I compile tcsh on my own it work properly. % file /bin/tcsh /bin/tcsh: ELF 64-bit LSB executable, AMD x86-64, version 1 (SYSV), for GNU/Linux 2.4.0, dynamically linked (uses shared libs), stripped % ls -la /bin/tcsh -rwxr-xr-x 1 root root 376k Jan 25 2003 /bin/tcsh* % ./3Gb-per-proc trying 1000Mb...1000Mb trying 1000Mb...Not enough memory trying 500Mb...1500Mb trying 500Mb...2000Mb trying 500Mb...Not enough memory trying 250Mb...2250Mb trying 250Mb...Not enough memory trying 125Mb...2375Mb trying 125Mb...Not enough memory trying 62Mb...Not enough memory trying 31Mb...2406Mb trying 31Mb...Not enough memory trying 15Mb...2421Mb trying 15Mb...Not enough memory trying 7Mb...Not enough memory trying 3Mb...2424Mb trying 3Mb...Not enough memory trying 1Mb...2425Mb trying 1Mb...2426Mb trying 1Mb...2427Mb trying 1Mb...Not enough memory Total = 2427Mb % file tcsh tcsh: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), for GNU/Linux 2.0.0, dynamically linked (uses shared libs), stripped % ls -la tcsh -r-xr-xr-x 1 root root 344k Nov 3 13:18 tcsh* % ./tcsh % ./3Gb-per-proc trying 1000Mb...1000Mb trying 1000Mb...2000Mb trying 1000Mb...3000Mb trying 1000Mb...Not enough memory trying 500Mb...3500Mb trying 500Mb...Not enough memory trying 250Mb...3750Mb trying 250Mb...Not enough memory trying 125Mb...3875Mb trying 125Mb...Not enough memory trying 62Mb...Not enough memory trying 31Mb...3906Mb trying 31Mb...3937Mb trying 31Mb...Not enough memory trying 15Mb...3952Mb trying 15Mb...Not enough memory trying 7Mb...3959Mb trying 7Mb...Not enough memory trying 3Mb...3962Mb trying 3Mb...Not enough memory trying 1Mb...3963Mb trying 1Mb...Not enough memory Total = 3963Mb Version-Release number of selected component (if applicable): tcsh-6.12-4 How reproducible: Always Steps to Reproduce: 1. a 2. 3. Additional info: