PHP-gdb 回溯中的 FPM 未知调用者

Question

我正在我的 php 应用程序中调试一个段错误，我使用 --enable-debug 选项编译了 php 并且在段错误期间 php-fpm 转储核心之后，我运行:

$ 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 ?? ()

我还把 php 来源的 .gdbinit 放到有核心文件的目录，并将 set auto-load safe-path / 设置为 ~/.gdbinit（虽然不知道它有什么帮助）。

如您所见，回溯中有 ?? 根本没有帮助。这是应该的吗？有什么办法可以找到真正的来电者吗？

Answer 1

Is this how it should be?

没有

Is there any way to get the real caller?

可能。

您的堆栈跟踪表明 /usr/local/sbin/php-fpm 已完全剥离（已删除其符号 table）。您可以通过 file /usr/local/sbin/php-fpm.

确认这一点

make install 完全剥离二进制文件的情况并不少见。您应该尝试使用 "as built" 二进制文件（而不是您现在使用的 "as installed"）：gdb /path/to/build/tree/php-fpm core.

PHP-gdb 回溯中的 FPM 未知调用者

PHP-FPM unknown caller in gdb backtrace

php

gdb

fpm