# gdb /usr/libexec/mysqld core.31983
GNU gdb Red Hat Linux (6.3.0.0-1.122rh)
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This GDB was configured as "x86_64-redhat-linux-gnu"...Using host libthread_db library "/lib64/libthread_db.so.1".

Core was generated by `/usr/libexec/mysqld --defaults-file=/etc/my.cnf --basedir=/usr --datadir=/var/l'.
Program terminated with signal 11, Segmentation fault.
Reading symbols from /lib64/librt.so.1...done.
Loaded symbols for /lib64/librt.so.1
Reading symbols from /usr/lib64/libz.so.1...done.
Loaded symbols for /usr/lib64/libz.so.1
Reading symbols from /lib64/libdl.so.2...done.
Loaded symbols for /lib64/libdl.so.2
Reading symbols from /lib64/libssl.so.6...done.
Loaded symbols for /lib64/libssl.so.6
Reading symbols from /lib64/libcrypto.so.6...done.
Loaded symbols for /lib64/libcrypto.so.6
Reading symbols from /lib64/libpthread.so.0...done.
Loaded symbols for /lib64/libpthread.so.0
Reading symbols from /lib64/libcrypt.so.1...done.
Loaded symbols for /lib64/libcrypt.so.1
Reading symbols from /lib64/libnsl.so.1...done.
Loaded symbols for /lib64/libnsl.so.1
Reading symbols from /usr/lib64/libstdc++.so.6...done.
Loaded symbols for /usr/lib64/libstdc++.so.6
Reading symbols from /lib64/libm.so.6...done.
Loaded symbols for /lib64/libm.so.6
Reading symbols from /lib64/libgcc_s.so.1...done.
Loaded symbols for /lib64/libgcc_s.so.1
Reading symbols from /lib64/libc.so.6...done.
Loaded symbols for /lib64/libc.so.6
Reading symbols from /lib64/ld-linux-x86-64.so.2...done.
Loaded symbols for /lib64/ld-linux-x86-64.so.2
Reading symbols from /usr/lib64/libgssapi_krb5.so.2...done.
Loaded symbols for /usr/lib64/libgssapi_krb5.so.2
Reading symbols from /usr/lib64/libkrb5.so.3...done.
Loaded symbols for /usr/lib64/libkrb5.so.3
Reading symbols from /lib64/libcom_err.so.2...done.
Loaded symbols for /lib64/libcom_err.so.2
Reading symbols from /usr/lib64/libk5crypto.so.3...done.
Loaded symbols for /usr/lib64/libk5crypto.so.3
Reading symbols from /lib64/libresolv.so.2...done.
Loaded symbols for /lib64/libresolv.so.2
Reading symbols from /usr/lib64/libkrb5support.so.0...done.
Loaded symbols for /usr/lib64/libkrb5support.so.0
Reading symbols from /lib64/libnss_files.so.2...done.
Loaded symbols for /lib64/libnss_files.so.2
#0  0x000000342630a433 in pthread_kill () from /lib64/libpthread.so.0
(gdb) backtrace full
#0  0x000000342630a433 in pthread_kill () from /lib64/libpthread.so.0
No symbol table info available.
#1  0x000000000055ba3c in handle_segfault (sig=11) at mysqld.cc:2094
No locals.
#2  <signal handler called>
No symbol table info available.
#3  SEL_ARG::last (this=0x0) at opt_range.cc:1295
        next_arg = (SEL_ARG *) 0x0
#4  0x0000000000611a91 in get_func_mm_tree (param=0x454139f0, cond_func=0x19a8410, field=0x17635a8, value=Variable "value" is not available.
) at opt_range.cc:3556
        last_val = Variable "last_val" is not available.
(gdb)