记一次PyQT5 core dump调试过程

PyQT5 core dump调试：从设置到问题解决

最新推荐文章于 2023-08-04 00:33:54 发布

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最新推荐文章于 2023-08-04 00:33:54 发布 · 1.4k 阅读

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#python #PyQT5 #gdb #core dump #setText

本文详细记录了一次PyQT5应用出现core dump后的调试过程，从设置系统允许生成core dump文件，到使用gdb进行调试，再到定位问题发生在PyQT5的setText函数。通过分析调用堆栈，发现问题与内存分配有关，最终通过重构界面更新线程，避免了主线程与更新线程间的潜在冲突，成功解决问题。

1. 首先设置系统允许生成core dump文件

步骤一：开启core dump文件生成

ulimit -c unlimited

步骤二：设置core dump文件位置

vi /etc/sysctl.conf

修改（添加）如下两个变量

kernel.core_pattern =/var/core/core_%e_%p

kernel.core_uses_pid= 0

这里是改为生成目录在/var/core/，%e代表程序名称，%p是进程ID

如果想直接生成在可执行文件相同目录，前面不要加任何目录，直接

kernel.core_pattern =core_%e_%p

步骤三：让修改生效

sysctl -p/etc/sysctl.conf

2. 准备工作

准备工作

安装 gdb 和 python2.7-dbg:

sudo apt-get install gdb python2.7-dbg

设置 /proc/sys/kernel/yama/ptrace_scope:

echo 0 |sudo tee /proc/sys/kernel/yama/ptrace_scope

3. gdb调试Python core文件的方法

使用gdb打开并调试core文件

gdb python core

$ gdb python core
GNU gdb (Ubuntu 7.11.1-0ubuntu1~16.5) 7.11.1
Copyright (C) 2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from python...Reading symbols from /usr/lib/debug/.build-id/04/9b3068eb18127661de41257e012a54934fb0ee.debug...done.
done.


[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `python2 mantra_hmi_pro.py'.
Program terminated with signal SIGABRT, Aborted.
#0  0x00007f04fdf36428 in __GI_raise (sig=si

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