I strongly suspect its a Fedora problem, not a Freeradius problem. (Or else I made a boo-boo configuring the OS) Alan DeKok replied to matthew zeier:

Let me clear: I cannot reproduce this problem here. No one else has seen the same problem.

May or may not be relevant, but I've got two supposedly identical Fedora 6 machines, one gets a similar error, the other doesn't!. Both upgraded with yum to current level, followed by manual install and configure of Freeradius 1.1.5 - I cut and pasted the commands from one machine to the other and I FTPed the files including ones I modified. (And the one it works on is the SECOND one I installed, so its not a failure to copy correctly!) I think there must be some difference in my /usr/local/lib/libltdl.so.3.1.4 - they are slightly different sizes. I have no idea why, I used the same commands to install both systems. I will compare them. Just in case it means anything to anyone I attach the command output, but as I said my guess is its a Fedora problem [root@ficus raddb]# radiusd -v radiusd: FreeRADIUS Version 1.1.5, for host i686-pc-linux-gnu, built on Mar 9 2007 at 13:16:16 Copyright (C) 2000-2006 The FreeRADIUS server project. [root@ficus raddb]# radiusd -X Starting - reading configuration files ... reread_config: reading radiusd.conf Config: including file: /usr/local/etc/raddb/proxy.conf Config: including file: /usr/local/etc/raddb/clients.conf Config: including file: /usr/local/etc/raddb/snmp.conf Config: including file: /usr/local/etc/raddb/eap.conf Config: including file: /usr/local/etc/raddb/sql.conf main: prefix = "/usr/local" main: localstatedir = "/usr/local/var" main: logdir = "/usr/local/var/log/radius" main: libdir = "/usr/local/lib" main: radacctdir = "/usr/local/var/log/radius/radacct" main: hostname_lookups = no main: max_request_time = 30 main: cleanup_delay = 5 main: max_requests = 1024 main: delete_blocked_requests = 0 main: port = 0 main: allow_core_dumps = no main: log_stripped_names = no main: log_file = "/usr/local/var/log/radius/radius.log" main: log_auth = no main: log_auth_badpass = no main: log_auth_goodpass = no main: pidfile = "/usr/local/var/run/radiusd/radiusd.pid" main: user = "(null)" main: group = "(null)" main: usercollide = no main: lower_user = "no" main: lower_pass = "no" main: nospace_user = "no" main: nospace_pass = "no" main: checkrad = "/usr/local/sbin/checkrad" main: proxy_requests = yes proxy: retry_delay = 5 proxy: retry_count = 3 proxy: synchronous = no proxy: default_fallback = yes proxy: dead_time = 120 proxy: post_proxy_authorize = no proxy: wake_all_if_all_dead = no security: max_attributes = 200 security: reject_delay = 1 --More--*** glibc detected *** radiusd: double free or corruption (fasttop): 0x81029498 *** ======= Backtrace: ========= /lib/libc.so.6[0x24b09d] /lib/libc.so.6(cfree+0x90)[0x24e6f0] /usr/local/lib/libltdl.so.3[0x14151b] /usr/local/lib/libltdl.so.3(lt_dlopenext+0xbe)[0x141eae] radiusd(find_module_instance+0x317)[0x8000cbb7] radiusd(setup_modules+0x1d8)[0x8000d168] radiusd(main+0x45c)[0x8001079c] /lib/libc.so.6(__libc_start_main+0xdc)[0x1faf2c] radiusd[0x80004771] ======= Memory map: ======== 00110000-00123000 r-xp 00000000 fd:00 13959203 /lib/libpthread-2.5.so 00123000-00124000 r-xp 00012000 fd:00 13959203 /lib/libpthread-2.5.so 00124000-00125000 rwxp 00013000 fd:00 13959203 /lib/libpthread-2.5.so 00125000-00127000 rwxp 00125000 00:00 0 00127000-0013c000 r-xp 00000000 fd:00 13087333 /usr/local/lib/libradius-1.1.5.so 0013c000-0013d000 rwxp 00014000 fd:00 13087333 /usr/local/lib/libradius-1.1.5.so 0013d000-0013e000 rwxp 0013d000 00:00 0 0013e000-00143000 r-xp 00000000 fd:00 13086902 /usr/local/lib/libltdl.so.3.1.4 00143000-00144000 rwxp 00004000 fd:00 13086902 /usr/local/lib/libltdl.so.3.1.4 00144000-0014b000 r-xp 00000000 fd:00 13087742 /usr/lib/libkrb5support.so.0.1 0014b000-0014c000 rwxp 00006000 fd:00 13087742 /usr/lib/libkrb5support.so.0.1 0014e000-0014f000 r-xp 0014e000 00:00 0 [vdso] 0014f000-00161000 r-xp 00000000 fd:00 13082790 /usr/lib/libz.so.1.2.3 00161000-00162000 rwxp 00011000 fd:00 13082790 /usr/lib/libz.so.1.2.3 00162000-0016b000 r-xp 00000000 fd:00 13959208 /lib/libnss_files-2.5.so 0016b000-0016c000 r-xp 00008000 fd:00 13959208 /lib/libnss_files-2.5.so 0016c000-0016d000 rwxp 00009000 fd:00 13959208 /lib/libnss_files-2.5.so 0016d000-00171000 r-xp 00000000 fd:00 13959206 /lib/libnss_dns-2.5.so 00171000-00172000 r-xp 00003000 fd:00 13959206 /lib/libnss_dns-2.5.so 00172000-00173000 rwxp 00004000 fd:00 13959206 /lib/libnss_dns-2.5.so 00173000-0017e000 r-xp 00000000 fd:00 13959199 /lib/libgcc_s-4.1.1-20070105.so.1 0017e000-0017f000 rwxp 0000a000 fd:00 13959199 /lib/libgcc_s-4.1.1-20070105.so.1 001a0000-001e1000 r-xp 00000000 fd:00 13959361 /lib/libssl.so.0.9.8b 001e1000-001e5000 rwxp 00040000 fd:00 13959361 /lib/libssl.so.0.9.8b 001e5000-0031c000 r-xp 00000000 fd:00 13959186 /lib/libc-2.5.so 0031c000-0031e000 r-xp 00137000 fd:00 13959186 /lib/libc-2.5.so 0031e000-0031f000 rwxp 00139000 fd:00 13959186 /lib/libc-2.5.so 0031f000-00322000 rwxp 0031f000 00:00 0 00322000-003a8000 r-xp 00000000 fd:00 13100407 /usr/lib/libkrb5.so.3.2 003a8000-003aa000 rwxp 00086000 fd:00 13100407 /usr/lib/libkrb5.so.3.2 00474000-0048d000 r-xp 00000000 fd:00 13959170 /lib/ld-2.5.so 0048d000-0048e000 r-xp 00018000 fd:00 13959170 /lib/ld-2.5.so 0048e000-0048f000 rwxp 00019000 fd:00 13959170 /lib/ld-2.5.so 00710000-0082c000 r-xp 00000000 fd:00 13959247 /lib/libcrypto.so.0.9.8b 0082c000-0083e000 rwxp 0011c000 fd:00 13959247 /lib/libcrypto.so.0.9.8b 0083e000-00842000 rwxp 0083e000 00:00 0 008ec000-00911000 r-xp 00000000 fd:00 13100406 /usr/lib/libk5crypto.so.3.0 00911000-00912000 rwxp 00025000 fd:00 13100406 /usr/lib/libk5crypto.so.3.0 00a47000-00a56000 r-xp 00000000 fd:00 13959217 /lib/libresolv-2.5.so 00a56000-00a57000 r-xp 0000e000 fd:00 13959217 /lib/libresolv-2.5.so 00a57000-00a58000 rwxp 0000f000 fd:00 13959217 /lib/libresolv-2.5.so 00a58000-00a5a000 rwxp 00a58000 00:00 0 00c7a000-00ca4000 r-xp 00000000 fd:00 13100408 /usr/lib/libgssapi_krb5.so.2.2 00ca4000-00ca5000 rwxp 00029000 fd:00 13100408 /usr/lib/libgssapi_krb5.so.2.2 00cf1000-00cf3000 r-xp 00000000 fd:00 13099224 /usr/local/lib/rlm_exec-1.1.5.so 00cf3000-00cf4000 rwxp 00001000 fd:00 13099224 /usr/local/lib/rlm_exec-1.1.5.so 00d1b000-00d2e000 r-xp 00000000 fd:00 13959209 /lib/libnsl-2.5.so 00d2e000-00d2f000 r-xp 00012000 fd:00 13959209 /lib/libnsl-2.5.so 00d2f000-00d30000 rwxp 00013000 fd:00 13959209 /lib/libnsl-2.5.so 00d30000-00d32000 rwxp 00d30000 00:00 0 00de4000-00de6000 r-xp 00000000 fd:00 13959245 /lib/libcom_err.so.2.1 00de6000-00de7000 rwxp 00001000 fd:00 13959245 /lib/libcom_err.so.2.1 00e98000-00e9a000 r-xp 00000000 fd:00 13959193 /lib/libdl-2.5.so 00e9a000-00e9b000 r-xp 00001000 fd:00 13959193 /lib/libdl-2.5.so 00e9b000-00e9c000 rwxp 00002000 fd:00 13959193 /lib/libdl-2.5.so 00e9c000-00ea1000 r-xp 00000000 fd:00 13959219 /lib/libcrypt-2.5.so 00ea1000-00ea2000 r-xp 00004000 fd:00 13959219 /lib/libcrypt-2.5.so 00ea2000-00ea3000 rwxp 00005000 fd:00 13959219 /lib/libcrypt-2.5.so 00ea3000-00eca000 rwxp 00ea3000 00:00 0 80000000-8001d000 r-xp 00000000 fd:00 13100199 /usr/local/sbin/radiusd 8001d000-8001e000 rw-p 0001d000 fd:00 13100199 /usr/local/sbin/radiusd 8001e000-8001f000 rw-p 8001e000 00:00 0 80f4e000-81035000 rw-p 80f4e000 00:00 0 b7e00000-b7e21000 rw-p b7e00000 00:00 0 b7e21000-b7f00000 ---p b7e21000 00:00 0 b7fbe000-b7fc2000 rw-p b7fbe000 00:00 0 b7fd0000-b7fd2000 rw-p b7fd0000 00:00 0 bf81b000-bf84c000 rw-p bf81b000 00:00 0 [stack]