I'm not able to decode the core. root@a6s23:/var/tmp# gdb /var/tmp/vizd nodea35_core.contrail-collec.19119.nodea35.1410186621 GNU gdb (Ubuntu/Linaro 7.4-2012.04-0ubuntu2.1) 7.4-2012.04 Copyright (C) 2012 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-linux-gnu". For bug reporting instructions, please see: ... Reading symbols from /var/tmp/vizd...done. warning: core file may not match specified executable file. [New LWP 19146] [New LWP 19119] [New LWP 19144] [New LWP 19147] [New LWP 19145] warning: Can't read pathname for load map: Input/output error. [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". warning: no loadable sections found in added symbol-file system-supplied DSO at 0x7fff58da2000 Core was generated by `/usr/bin/contrail-collector'. Program terminated with signal 6, Aborted. #0 0x00007f4720646425 in sigandset () from /lib/x86_64-linux-gnu/libc.so.6 (gdb) bt #0 0x00007f4720646425 in sigandset () from /lib/x86_64-linux-gnu/libc.so.6 #1 0x00007f4720649b8b in qsort_r () from /lib/x86_64-linux-gnu/libc.so.6 Backtrace stopped: previous frame inner to this frame (corrupt stack?) (gdb) info threads Id Target Id Frame 5 Thread 0x7f471f3aa700 (LWP 19145) 0x00007f47206ffee9 in ?? () from /lib/x86_64-linux-gnu/libc.so.6 4 Thread 0x7f471eba8700 (LWP 19147) 0x00007f47206ffee9 in ?? () from /lib/x86_64-linux-gnu/libc.so.6 3 Thread 0x7f471f7ab700 (LWP 19144) 0x00007f47206ffee9 in ?? () from /lib/x86_64-linux-gnu/libc.so.6 2 Thread 0x7f4722d48740 (LWP 19119) 0x00007f4720704363 in recv () from /lib/x86_64-linux-gnu/libc.so.6 * 1 Thread 0x7f471efa9700 (LWP 19146) 0x00007f4720646425 in sigandset () from /lib/x86_64-linux-gnu/libc.so.6 (gdb) thread apply all bt Thread 5 (Thread 0x7f471f3aa700 (LWP 19145)): #0 0x00007f47206ffee9 in ?? () from /lib/x86_64-linux-gnu/libc.so.6 #1 0x00007f4721fd0d32 in ?? () from /usr/lib/libtbb_debug.so.2 #2 0x00007f4721fd108d in ?? () from /usr/lib/libtbb_debug.so.2 #3 0x00007f4721fe3d9f in rml::internal::thread_monitor::commit_wait(rml::internal::thread_monitor::cookie&) () from /usr/lib/libtbb_debug.so.2 #4 0x00007f4721fe343d in ?? () from /usr/lib/libtbb_debug.so.2 #5 0x00007f4721fe3270 in ?? () from /usr/lib/libtbb_debug.so.2 #6 0x00007f4721b3ae9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0 #7 0x00007f4720703ccd in personality () from /lib/x86_64-linux-gnu/libc.so.6 #8 0x0000000000000000 in ?? () Thread 4 (Thread 0x7f471eba8700 (LWP 19147)): #0 0x00007f47206ffee9 in ?? () from /lib/x86_64-linux-gnu/libc.so.6 #1 0x00007f4721fd0d32 in ?? () from /usr/lib/libtbb_debug.so.2 #2 0x00007f4721fd108d in ?? () from /usr/lib/libtbb_debug.so.2 #3 0x00007f4721fe3d9f in rml::internal::thread_monitor::commit_wait(rml::internal::thread_monitor::cookie&) () from /usr/lib/libtbb_debug.so.2 #4 0x00007f4721fe343d in ?? () from /usr/lib/libtbb_debug.so.2 #5 0x00007f4721fe3270 in ?? () from /usr/lib/libtbb_debug.so.2 #6 0x00007f4721b3ae9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0 #7 0x00007f4720703ccd in personality () from /lib/x86_64-linux-gnu/libc.so.6 #8 0x0000000000000000 in ?? () Thread 3 (Thread 0x7f471f7ab700 (LWP 19144)): #0 0x00007f47206ffee9 in ?? () from /lib/x86_64-linux-gnu/libc.so.6 #1 0x00007f4721fd0d32 in ?? () from /usr/lib/libtbb_debug.so.2 #2 0x00007f4721fd108d in ?? () from /usr/lib/libtbb_debug.so.2 #3 0x00007f4721fe3d9f in rml::internal::thread_monitor::commit_wait(rml::internal::thread_monitor::cookie&) () from /usr/lib/libtbb_debug.so.2 #4 0x00007f4721fe343d in ?? () from /usr/lib/libtbb_debug.so.2 #5 0x00007f4721fe3270 in ?? () from /usr/lib/libtbb_debug.so.2 #6 0x00007f4721b3ae9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0 #7 0x00007f4720703ccd in personality () from /lib/x86_64-linux-gnu/libc.so.6 #8 0x0000000000000000 in ?? () Thread 2 (Thread 0x7f4722d48740 (LWP 19119)): #0 0x00007f4720704363 in recv () from /lib/x86_64-linux-gnu/libc.so.6 #1 0x00007fff58c09890 in ?? () #2 0x000000000000648b in ?? () #3 0x00007fff58c0a130 in ?? () #4 0x180027b000000005 in ?? () #5 0x0000000400007f47 in ?? () #6 0x00007f47180027b0 in ?? () #7 0x024229e000000004 in ?? () #8 0x00007f4700000000 in ?? () #9 0x0000000000000018 in ?? () #10 0x000000000245b078 in ?? () #11 0x00007f47211c3c90 in vtable for std::ios_base () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6 #12 0x0000000000000006 in ?? () #13 0x0000000000000000 in ?? () Thread 1 (Thread 0x7f471efa9700 (LWP 19146)): #0 0x00007f4720646425 in sigandset () from /lib/x86_64-linux-gnu/libc.so.6 #1 0x00007f4720649b8b in qsort_r () from /lib/x86_64-linux-gnu/libc.so.6 Backtrace stopped: previous frame inner to this frame (corrupt stack?) (gdb) (gdb) q It seems like the core got corrupted while copying over? I also re-imaged with R1.10 34 ubuntu-icehouse and tried. Can you please monitor/reproduce? Thanks Megh