Question

我在命令行输入php -a，以交互方式使用PHP。我修改了/etc/php5/cli/php.ini来加载我使用SWIG构建的扩展模块。

当我终止交互式会话时，我遇到了分段错误：

root@yourbox:~$ php -a
Interactive shell

php > ^DSegmentation fault
root@yourbox:~$

我想在详细模式下运行php，以便我可以看到导致seg错误的调用。有没有办法在交互模式下详细运行php？例如，使用Python，可以运行python -v来获取详细的诊断信息。是否与PHP等效？

[[更新]]

使用valgrind时，这是一个堆栈跟踪：

root@yourbox:~$ USE_ZEND_ALLOC=0 valgrind php -a
==16414== Memcheck, a memory error detector
==16414== Copyright (C) 2002-2011, and GNU GPL'd, by Julian Seward et al.
==16414== Using Valgrind-3.7.0 and LibVEX; rerun with -h for copyright info
==16414== Command: php -a
==16414== 

valgrind:  Fatal error at startup: a function redirection
valgrind:  which is mandatory for this platform-tool combination
valgrind:  cannot be set up.  Details of the redirection are:
valgrind:  
valgrind:  A must-be-redirected function
valgrind:  whose name matches the pattern:      strlen
valgrind:  in an object with soname matching:   ld-linux-x86-64.so.2
valgrind:  was not found whilst processing
valgrind:  symbols from the object with soname: ld-linux-x86-64.so.2
valgrind:  
valgrind:  Possible fixes: (1, short term): install glibc's debuginfo
valgrind:  package on this machine.  (2, longer term): ask the packagers
valgrind:  for your Linux distribution to please in future ship a non-
valgrind:  stripped ld.so (or whatever the dynamic linker .so is called)
valgrind:  that exports the above-named function using the standard
valgrind:  calling conventions for this platform.  The package you need
valgrind:  to install for fix (1) is called
valgrind:  
valgrind:    On Debian, Ubuntu:                 libc6-dbg
valgrind:    On SuSE, openSuSE, Fedora, RHEL:   glibc-debuginfo
valgrind:  
valgrind:  Cannot continue -- exiting now.  Sorry.

Answer 1

您可以使用常用的C调试工具获取堆栈跟踪。例如：

Valgrind的：
```
$ USE_ZEND_ALLOC=0 valgrind php -a
```
GDB：
```
$ gdb php
> r -a
```

如果没有获得有意义的堆栈跟踪，则可能需要使用调试符号重新编译PHP并减少优化。您可以将--enable-debug传递到./configure行。

Answer 2

您可能希望使用valgrind或类似内容来准确追踪您的PHP安装Seg Faulting的位置。

最有可能的是，错误与您加载的扩展程序有关，可能无法编译到正确的体系结构，包含泄漏或其他内容。

在交互式会话中详细运行PHP

2 个答案: