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root@mds0:~# gdb /usr/lib/debug/usr/bin/cmds /core
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GNU gdb (GDB) 7.1-ubuntu
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Copyright (C) 2010 Free Software Foundation, Inc.
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License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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This is free software: you are free to change and redistribute it.
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There is NO WARRANTY, to the extent permitted by law. Type "show copying"
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and "show warranty" for details.
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This GDB was configured as "x86_64-linux-gnu".
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For bug reporting instructions, please see:
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<http://www.gnu.org/software/gdb/bugs/>...
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Reading symbols from /usr/lib/debug/usr/bin/cmds...done.
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[New Thread 18272]
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[New Thread 18328]
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[New Thread 18334]
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[New Thread 18347]
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warning: Unable to find dynamic linker breakpoint function.
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GDB will be unable to debug shared library initializers
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and track explicitly loaded dynamic code.
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Core was generated by `/usr/bin/cmds -i 0 -c /etc/ceph/ceph.conf'.
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Program terminated with signal 11, Segmentation fault.
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#0 CDentry::get_dir (this=0x94c4d0, mds=0x15592c0) at mds/events/../CDentry.h:196
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196 mds/events/../CDentry.h: No such file or directory.
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in mds/events/../CDentry.h
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(gdb) bt
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#0 CDentry::get_dir (this=0x94c4d0, mds=0x15592c0) at mds/events/../CDentry.h:196
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#1 LogSegment::try_to_expire (this=0x94c4d0, mds=0x15592c0) at mds/journal.cc:105
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#2 0x00007f44d42c5e00 in ?? ()
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#3 0x00007f44d4a640ea in ?? ()
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#4 0x00000002385a9c71 in ?? ()
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#5 0x0000000000025824 in ?? ()
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#6 0x00000000000038c0 in ?? ()
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#7 0x00007f44d4e168e9 in ?? ()
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#8 0x0000000000000000 in ?? ()
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(gdb)
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