GNU gdb (Ubuntu 7.7.1-0ubuntu5~14.04.2) 7.7.1
Copyright (C) 2014 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from /usr/bin/qemu-system-x86_64...(no debugging symbols found)...done.

warning: core file may not match specified executable file.
[New LWP 13840]
[New LWP 13841]
[New LWP 13842]
[New LWP 13843]
[New LWP 13864]
[New LWP 13865]
[New LWP 13866]
[New LWP 13870]
[New LWP 13838]
[New LWP 13847]
[New LWP 13869]
[New LWP 13873]
[New LWP 13871]
[New LWP 13868]
[New LWP 13874]
[New LWP 13872]
[New LWP 13875]
[New LWP 13876]
[New LWP 13867]
[New LWP 13845]
[New LWP 13863]
[New LWP 13844]

warning: .dynamic section for "/usr/lib/x86_64-linux-gnu/libstdc++.so.6" is not at the expected address (wrong library or version mismatch?)

warning: Could not load shared library symbols for 11 libraries, e.g. /usr/lib/x86_64-linux-gnu/glusterfs/3.6.2/xlator/mount/api.so.
Use the "info sharedlibrary" command to see the complete listing.
Do you need "set solib-search-path" or "set sysroot"?
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `qemu-system-x86_64 -enable-kvm -name instance-000001ac -S -machine pc-i440fx-tr'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007f369c95248c in ?? ()
Traceback (most recent call last):
  File "/usr/share/gdb/auto-load/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19-gdb.py", line 63, in <module>
    from libstdcxx.v6.printers import register_libstdcxx_printers
ImportError: No module named 'libstdcxx'
(gdb) where
#0  0x00007f369c95248c in ?? ()
#1  0x00007f369bd2b3b1 in glfs_io_async_cbk (ret=<optimized out>, frame=<optimized out>, data=0x7f369ee536c0) at glfs-fops.c:598
#2  0x00007f369badb66a in syncopctx_setfspid (pid=0x7f369ee536c0) at syncop.c:191
#3  0x0000000000100011 in ?? ()
#4  0x00007f36a5ae26b0 in ?? ()
#5  0x00007f36a81e2800 in ?? ()
#6  0x00007f36a5ae26b0 in ?? ()
#7  0x00007f36a81e2800 in ?? ()
#8  0x0000000000000000 in ?? ()
(gdb)