在gdb回溯PHP-FPM不明來電者

Question

我調試在我的PHP應用程序段錯誤，我編譯PHP和--enable-debug選項和php-fpm的後段錯誤時轉儲核心，我跑：

$ gdb /usr/local/sbin/php-fpm core 
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Reading symbols from /usr/local/sbin/php-fpm...(no debugging symbols found)...done. 
[New LWP 2110] 

warning: Can't read pathname for load map: No error information. 
Core was generated by `php-fpm:'. 
Program terminated with signal SIGBUS, Bus error. 
#0 0x000055c27ba1f291 in ??() 
(gdb) bt 
#0 0x000055c27ba1f291 in ??() 
#1 0x000055c27ba21bce in _efree() 
#2 0x000055c27ba6c8b2 in ??() 
#3 0x000055c27ba70cee in zend_array_destroy() 
#4 0x000055c27ba56fbd in _zval_dtor_func() 
#5 0x000055c27ba6cce4 in ??() 
#6 0x000055c27ba70cc8 in zend_array_destroy() 
#7 0x000055c27ba56fbd in _zval_dtor_func() 
#8 0x000055c27ba6cce4 in ??() 
#9 0x000055c27ba70c8a in zend_array_destroy() 
#10 0x000055c27ba56fbd in _zval_dtor_func() 
#11 0x000055c27ba6cce4 in ??() 
#12 0x000055c27ba70cc8 in zend_array_destroy() 
#13 0x000055c27ba56fbd in _zval_dtor_func() 
#14 0x000055c27ba44b75 in ??() 
#15 0x000055c27ba450fe in zend_cleanup_user_class_data() 
#16 0x000055c27ba3f473 in ??() 
#17 0x000055c27ba5971b in zend_deactivate() 
#18 0x000055c27b9bf1df in php_request_shutdown() 
#19 0x000055c27bb55015 in ??() 
#20 0x00007f7fb743e964 in __libc_start_main() from /lib/ld-musl-x86_64.so.1 
#21 0x0000000000000000 in ??() 

我也把.gdbinit從php源到核心文件的目錄和設置set auto-load safe-path /到~/.gdbinit（不知道它是如何幫助）。

正如您所見，回溯中有??，根本沒有任何幫助。這是應該如何？有什麼方法可以獲得真正的來電者嗎？

Answer 1

這是怎麼回事？

號

有沒有什麼辦法讓真正的來電者？

也許。

您的堆棧跟蹤指示/usr/local/sbin/php-fpm已完全剝離（已刪除其符號表）。您可以使用file /usr/local/sbin/php-fpm進行確認。

make install完全去除二進制文件並不罕見。您應該嘗試使用「as built」二進制文件（而不是「現在正在安裝的」）：gdb /path/to/build/tree/php-fpm core。