gdb.md

GDB

Check dependencies

(gdb) info sharedlibrary

Set path for shared libraries

(gdb) set solib-search-path /path/to/symbol/folder

Check thread information

(gdb) info threads
(gdb) thread 1
(gdb) thread 2

Check /proc information

(gdb) info proc all
(gdb) info proc status
(gdb) info proc stat
(gdb) info proc mappings

Check files

(gdb) info files

Check frame information

(gdb) info frame

Check backtrace information

(gdb) bt
(gdb) bt full

Check stack overflow

In a running system, print the mappings of a process:

# cat /proc/<pid>/pmap

Examine the stack usage in a core dump:

(gdb) info threads
(gdb) thread <crashed_thread_id>
(gdb) info stack
# select the frame on top
(gdb) frame 0
(gdb) set $topsp=$sp
# select the frame on bottom
(gdb) frame <earliest_frame_id>
(gdb) print (char *)$sp - (char *)$topsp
# the value is an approximation of the stack usage