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Hi Andy As requested in todays meeting below is some output from a core file. The core file was a result of an xrootd crash on a manager at RAL. Looking at all our core files they seem to crash at the same point cheers Manny gdb ../../bin/xrootd core.6572 GNU gdb Red Hat Linux (6.1post-1.20040607.17rh) 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"...(no debugging symbols found)...Using host libthread_db library "/lib/tls/libthread_db.so.1". Core was generated by `/opt/xrootd/bin/xrootd -r -l /opt/xrootd/logs/xrdlog -c /opt/xrootd/etc/xrootd.'. Program terminated with signal 11, Segmentation fault. Reading symbols from /lib/libnsl.so.1...(no debugging symbols found)...done. Loaded symbols for /lib/libnsl.so.1 Reading symbols from /lib/tls/libpthread.so.0...(no debugging symbols found)...done. Loaded symbols for /lib/tls/libpthread.so.0 Reading symbols from /lib/tls/librt.so.1...(no debugging symbols found)...done. Loaded symbols for /lib/tls/librt.so.1 Reading symbols from /lib/libdl.so.2...(no debugging symbols found)...done. Loaded symbols for /lib/libdl.so.2 Reading symbols from /usr/lib/libstdc++.so.5...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libstdc++.so.5 Reading symbols from /lib/tls/libm.so.6...(no debugging symbols found)...done. Loaded symbols for /lib/tls/libm.so.6 Reading symbols from /lib/tls/libc.so.6...(no debugging symbols found)...done. Loaded symbols for /lib/tls/libc.so.6 Reading symbols from /lib/libgcc_s.so.1...(no debugging symbols found)...done. Loaded symbols for /lib/libgcc_s.so.1 Reading symbols from /lib/ld-linux.so.2...(no debugging symbols found)...done. Loaded symbols for /lib/ld-linux.so.2 Reading symbols from /lib/libnss_files.so.2...(no debugging symbols found)...done. Loaded symbols for /lib/libnss_files.so.2 Reading symbols from /opt/xrootd/lib/libXrdOfs.so...(no debugging symbols found)...done. Loaded symbols for /opt/xrootd/lib/libXrdOfs.so Reading symbols from /lib/libnss_dns.so.2...(no debugging symbols found)...done. Loaded symbols for /lib/libnss_dns.so.2 Reading symbols from /lib/libresolv.so.2...(no debugging symbols found)...done. Loaded symbols for /lib/libresolv.so.2 #0 0x002b3207 in main_arena () from /lib/tls/libc.so.6 (gdb) where #0 0x002b3207 in main_arena () from /lib/tls/libc.so.6 #1 0x08063ea7 in XrdObjectQ<XrdXrootdProtocol>::DoIt () #2 0x080739c0 in XrdScheduler::Run () #3 0x08072a20 in XrdStartWorking () #4 0x0807f4c2 in XrdOucThread_Xeq () #5 0x004d9dec in start_thread () from /lib/tls/libpthread.so.0 #6 0x0025aa2a in clone () from /lib/tls/libc.so.6