diff options
| -rw-r--r-- | debug.txt | 48 | ||||
| -rw-r--r-- | gdb.txt | 58 |
2 files changed, 101 insertions, 5 deletions
diff --git a/debug.txt b/debug.txt new file mode 100644 index 0000000..5a3c105 --- /dev/null +++ b/debug.txt @@ -0,0 +1,48 @@ +.:: debugging ::. +-------------------------------------------------------------------------------- + +# print syscalls of process with all threads (-f) of running process +strace -f -p <pid> +# only trace certain syscalls +strace -f -p <pid> -e trace=open,socket +# trace signals delivered to process +strace -f -p <pid> -e signal + +# dump stack of process and all threads +pstack <pid> + +# print file flags +# +fg print file flag abbreviations +lsof +fg -p <pid> + +# print process virt mem map +# compared to /proc/<>/maps it shows the size of the mappings +pmap <pid> + + +# get supported events +perf list + +perf stat -p <pid> +perf stat -p <pid> -I <ms> +perf stat -p <pid> -e cycles,faults,cache-misses,context-switches + +# -K hide kernel threads +perf top -F 99 -p <pid> -K + +perf record -F 99 -p <pid> +perf record -F 99 -p <pid> --call-graph dwarf +perf record -F 99 -p <pid> -e instructions,cpu-cycles,faults,cache-misses,context-switches + + +# print supported events +ophelp + +operf -p <pid> + +opreport -c +opreport -l + +-------------------------------------------------------------------------------- +vim:sts=2:et:tw=80:cc=80:fo+=t:ft=help + @@ -8,6 +8,7 @@ |prompt| |user_commands| |hooks| + |flows| # gdb(1) *gdb* ========= @@ -30,7 +31,7 @@ specify which process to follow on fork(2) sharedlibrary [regex] - load symbols of shared lib, if regex then only symbols + load symbols of shared lib, if REGEX then only symbols for matching libs break <sym> thread <tnum> @@ -41,20 +42,34 @@ so 'rbreak foo' matches barfoobar() command [bp_list] define commands to run after breakpoint hit if - bp_list not supplied attach command to last + BP_LIST not supplied attach command to last created bp - bp_list: space separates list, eg 'command 2 5-8' + BP_LIST: space separates list, eg 'command 2 5-8' to run command for bp 2,5,6,7,8 info functions [regex] - list functions according to regex, if regex empty, + list functions according to REGEX, if REGEX empty, list all info variables [regex] - list variables according to regex, if regex empty, + list variables according to REGEX, if REGEX empty, list all + info handle [signal] + list bevahior for SIGNAL, if SIGNAL empty list all signals + + handle signal <action> + configure how gdb handles SIGNAL which is ment for the debugee + <action>: + stop/nostop catch signal in gdb and break + print/noprint print message when gdb catches signal + pass/nopass pass signal down to debugee + noignore/ignore synonyms for + + catch signal <signal> + create a catchpoint for SIGNAL + user commands: *user_commands* define <cmd> defines user command <cmd> to be run @@ -78,6 +93,39 @@ # cmds executing <cmd> end + + flows: *flows* + # catch SIGSEGV and execute some actions once it happends + - script: + catch signal SIGSEGV + command + bt + ct + end + + # quickly execute gdb command on running process, eg get backtrace from + # thread 1 + - cmd: + $> gdb -ex 'thread 1' -ex 'bt' -p <PID> + + # script gdb for automating debugging sessions + - script: run.gdb + set pagination off + + break mmap + command + info reg rdi rsi rdx + bt + c + end + + #initial drop + c + + - cmd: + $> gdb -p <PID> -x ./run.gdb --batch &> run.log + + -------------------------------------------------------------------------------- vim:sts=2:et:tw=80:cc=80:fo+=t:ft=help |