Im not really sure if this thread is suited for this forum. If not, kindly move this thread to where it belongs.
This is the script I wrote to keep me sane while figuring out server crash. I figured some might find this useful.
This guide is specific to Linux hlds only, so all Windows users can leave now.
Content is rated
advanced, if you read through the guide and still seeing stars, Id advise you to seek help from your nearest linux guru available.
A couple of things to keep in mind before you start:-
1.
Not all crash is caused by Amxmodx or its plugins. Hlds is pretty much a hackjob consisting spaghetti of stray pointers. Something is bound to go wrong somewhere. :/
2. Debug build of Amxmodx and modules required. See
here. Otherwise, you wont see the fancy function signature and source code snippets.
3. Core dump required. See
here. Optional if you attach gdb to hlds directly.
How do you tell if its caused by Amxmodx plugins? For example, if you see amx_Xxx related functions in your backtrace, then there is a good chance it's caused by Amxmodx plugin.
PHP Code:
#0 0xb4756212 in get_pdata_int (amx=0x9312570, params=0x8bee910) at pdata.cpp:42
#1 0xb49d985a in amx_Callback (amx=0x9312570, index=166, result=0xbfb2be50, params=0x8bee910) at amx.cpp:474
#2 0xb49f3dd0 in JIT_OP_SYSREQ () from /home/game/hlds_zpm/cstrike/addons/amxmodx/dlls/amxmodx_mm_i386.so
#3 0xbfb2be50 in ?? ()
In this below example, it has nothing to do with Amxmodx at all.
PHP Code:
(gdb) bt
#0 0xb50df7f3 in main_hook_function(class_ret_t, unsigned int, enum_api_t, unsigned int, void const*) ()
from ./cstrike/addons/metamod/dlls/metamod_i386.so
#1 0xbfef3dd0 in SV_ParseStringCommand() from ./engine_i686.so
#2 0xbfb2be50 in ?? ()
Now if you are certain that crash is caused by Amxmodx plugin, upload the attached gdb script to your server. Fire up gdb with the coredump and source the script file. After that, run 'amx_analyze' command and it will helpfully tell you who to blame.
PHP Code:
(gdb) source /home/game/scripts/analyze.gdb
Available commands (AmxModX-related):
amx_analyze: Analyze the dump and try to figure out which AmxModX plugin caused it
amx_listplugins: List all loaded AmxModX plugins
amx_listplayers: List all players as seen by AmxModX
Available commands (metamod-related):
meta_analyze: Analyze the dump and try to figure out which metamod plugin caused it
Available commands (generic):
cmd_args: Dump the cmd string
If you have no idea where to start, just type '*_analyze' and let it figure out for you
(gdb) amx_analyze
Crash is most likely caused by: cstrike/addons/amxmodx/plugins/zombie_plague/zombie_plague43.amxx
The script contains few other commands too. I didnt bother explaining them here because they were either damn obvious or wasnt really useful at all.
Enjoy debugging.
06-11-2011, 08:54
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