linux - Analyzing Apache/PHP Core Dump -


i have been getting occasional seg fault apache enabled core dump on servers try figure out going on. last night got 1 , trying examine core dump find out what's going on. it's php process googled how examine these php. downloaded .gdbinit file php 5.2 , ran following on dump file:

$ gdb apache2 dumpfile [reading/loading symbols] (gdb) bt [...backtrace...] (gdb) source ~/.gdbinit (gdb) dump_bt executor_globals.current_execute_data attempt extract component of value not structure.

i should getting backtrace after dump_bt executor_globals.current_execute_data php script caused seg fault, keep getting attempt extract component of value not structure. instead.

at first time, got same problem you. run again bt , dump_bt commands , works:

(gdb) dump_bt executor_globals.current_execute_data attempt extract component of value not structure.  (gdb) bt #0  0x00002af8f874a5da in appendimages () /usr/lib64/libmagick.so.10 #1  0x00002af8f84586ce in magickappendimages () /usr/lib64/libwand.so.10 #2  0x00002af8f81a3ad8 in zim_imagick_appendimages (ht=<value optimized out>, return_value=0x2af8f9ded108,      return_value_ptr=<value optimized out>, this_ptr=<value optimized out>, return_value_used=<value optimized out>)     @ /var/tmp/imagick/imagick_class.c:8790  (gdb) dump_bt executor_globals.current_execute_data [0xe8609940] appendimages() /var/www/html/xx/yy.php:803  [0xe8605070] gencode() /var/www/html/xx/zz.php:127

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