core_pattern:

core_pattern is used to specify a core dumpfile pattern name.

. max length  characters; default value is "core"

. core_pattern is used as a pattern template for the output filename;

  certain string patterns (beginning with '%') are substituted with

  their actual values.

. backward compatibility with core_uses_pid:

        If core_pattern does not include "%p" (default does not)

        and core_uses_pid is set, then .PID will be appended to

        the filename.

. corename format specifiers:

        %<NUL>  '%' is dropped

        %%      output one '%'

        %p      pid

        %P      global pid (init PID namespace)

        %i      tid

        %I      global tid (init PID namespace)

        %u      uid

        %g      gid

        %d      dump mode, matches PR_SET_DUMPABLE and

                /proc/sys/fs/suid_dumpable

        %s      signal number

        %t      UNIX time of dump

        %h      hostname

        %e      executable filename (may be shortened)

        %E      executable path

        %<OTHER> both are dropped

. If the first character of the pattern is a '|', the kernel will treat

  the rest of the pattern as a command to run.  The core dump will be

  written to the standard input of that program instead of to a file.

#!bin/bash

#/proc/<pid>/maps

cat /proc/$/maps > /tmp/maps_of_$

#coredump

dd > /tmp/core_$1_$2_$

ulimit -c unlimited

echo "|/usr/local/coredump.sh %p %e %s" > /proc/sys/kernel/core_pattern

root@chgao-virtual-machine:/media/new/linyao/debugging/SIGFPE# ./test

Floating point exception

root@chgao-virtual-machine:/tmp# ls

core_8124_test_8  maps_of_8124

root@chgao-virtual-machine:/tmp# file core_8124_test_8

core_8124_test_8: ELF -bit LSB core file x86-, version  (SYSV), SVR4-style, from './test'

root@chgao-virtual-machine:/tmp# file maps_of_8124

maps_of_8124: ASCII text

root@chgao-virtual-machine:/tmp# cat maps_of_8124

- r-xp  fc:                            /media/new/linyao/debugging/SIGFPE/test

- r--p  fc:                            /media/new/linyao/debugging/SIGFPE/test

- rw-p  fc:                            /media/new/linyao/debugging/SIGFPE/test

7fad5d07a000-7fad5d23a000 r-xp  :                      /lib/x86_64-linux-gnu/libc-2.23.so

7fad5d23a000-7fad5d43a000 ---p 001c0000 :                      /lib/x86_64-linux-gnu/libc-2.23.so

7fad5d43a000-7fad5d43e000 r--p 001c0000 :                      /lib/x86_64-linux-gnu/libc-2.23.so

7fad5d43e000-7fad5d440000 rw-p 001c4000 :                      /lib/x86_64-linux-gnu/libc-2.23.so

7fad5d440000-7fad5d444000 rw-p  :

7fad5d444000-7fad5d46a000 r-xp  :                      /lib/x86_64-linux-gnu/ld-2.23.so

7fad5d64b000-7fad5d64e000 rw-p  :

7fad5d669000-7fad5d66a000 r--p  :                      /lib/x86_64-linux-gnu/ld-2.23.so

7fad5d66a000-7fad5d66b000 rw-p  :                      /lib/x86_64-linux-gnu/ld-2.23.so

7fad5d66b000-7fad5d66c000 rw-p  :

7ffc833d2000-7ffc833f3000 rw-p  :                           [stack]

7ffc833f5000-7ffc833f8000 r--p  :                           [vvar]

7ffc833f8000-7ffc833fa000 r-xp  :                           [vdso]

ffffffffff600000-ffffffffff601000 r-xp  :                   [vsyscall]

root@chgao-virtual-machine:/media/new/linyao/debugging/SIGFPE# gdb ./test /tmp/core_8124_test_8
GNU gdb (Ubuntu 7.11.-0ubuntu1~16.5) 7.11.

Copyright (C)  Free Software Foundation, Inc.

License GPLv3+: GNU GPL version  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 ./test...done.

[New LWP ]

warning: the debug information found in "/lib64/ld-2.23.so" does not match "/lib64/ld-linux-x86-64.so.2" (CRC mismatch).

Core was generated by `./test'.
Program terminated with signal SIGFPE, Arithmetic exception.
#  0x00000000004004f3 in main (argc=, argv=0x7ffc833f1658) at test.c:

      result = a / b;
(gdb) info registers

rax            0x2

rbx            0x0

rcx            0x0

rdx            0x0

rsi            0x7ffc833f1658

rdi            0x1

rbp            0x7ffc833f1570    0x7ffc833f1570

rsp            0x7ffc833f1570    0x7ffc833f1570

r8             0x400570

r9             0x7fad5d454ab0

r10            0x846

r11            0x7fad5d09a740

r12            0x4003e0

r13            0x7ffc833f1650

r14            0x0

r15            0x0

rip            0x4004f3    0x4004f3 <main+>

eflags         0x10246    [ PF ZF IF RF ]

cs             0x33

ss             0x2b

ds             0x0

es             0x0

fs             0x0

gs             0x0    

(gdb) bt

#  0x00000000004004f3 in main (argc=, argv=0x7ffc833f1658) at test.c: