i need to know analyze "core.xxxx" with gdb

Question

gdb /usr/sbin/httpd ./core (gdb) bt

#0  0x00002af748ff9265 in ?? ()
#1  0x00002af748ffad10 in ?? ()
#2  0x00007fff0a31e248 in ?? ()
#3  0x00007fff0a317aa0 in ?? ()
#4  0x00007fff0a317a10 in ?? ()
#5  0x00007fff0a317ad0 in ?? ()
#6  0x0000000200000000 in ?? ()

plase tell me how to. thank u.

Answer 1

Your core file comes from an executable built without debugging information. That is why the display of your execution stack lacks function names and lines information

Answer 2

#0 0x00002af748ff9265 in ?? ()

The most likely reason you don't get any symbol names in the core dump is that you either

1. Have a truncated core, or
2. Are analyzing core that was produced on a different system from the one you are running GDB on, or
3. Have a stripped executable (in which case, nm /usr/sbin/httpd will say stripped or something).

My bet it's 1 or 2. If it is 2, see this answer. If it is 3, and you are using system-provided apache build, see if installing httpd-debug or similar package helps.