Python Deadlock

一次线上针对python 死锁问题进行了追踪, 这里进行记录.

更新镜像源: 我使用了清华大学的开源镜像站 https://mirror.tuna.tsinghua.edu.cn/help/ubuntu/ vim /etc/apt/sources.list

# 默认注释了源码镜像以提高 apt update 速度，如有需要可自行取消注释
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse

sudo apt-get update

下载gdb套件 sudo apt-get install gdb python2.7-dbg
确定进程

xxxxx:xxxx# ps -ef | grep python
root          58       1  0 14:23 ?        00:00:01 python launch.py
root         130      58  0 14:23 ?        00:00:06 python launch.py
root         131      58  0 14:23 ?        00:00:22 python launch.py
root         132      58  0 14:23 ?        00:00:17 python launch.py
root         133      58  0 14:23 ?        00:00:17 python launch.py
root         134      58  0 14:23 ?        00:00:17 python launch.py
root        6461     383  0 16:01 pts/0    00:00:00 grep python

看下进程的状态:

strace -T -tt -e trace=all -p 131
xxx(xxxx):log# strace -T -tt -e trace=all -p  130 
Process 130 attached
15:34:41.294497 futex(0x1b19c20, FUTEX_WAIT_PRIVATE, 0, NULL

gdb调试

sudo gdb python -p 131
info threads 
thread 1 
py-list 
info frame
py-up

相关gdb技巧不叙述. 参考地址: blog