GNOME 3 won’t unlock

Every couple days something on my RHEL 7 box goes into a swapstorm and uses up all the memory. I think it’s Firefox, but I never figured out why, generally I have four different Firefoxes running with four different profiles, so it’s hard to tell which one’s failing (if it even is that). Anyway, sometimes it makes the screen lock crash or something, and I can’t get in, and I can never remember what process you have to kill to get back in, so here it is: gnome-shell. You have to killall -9 gnome-shell, and it lets you back in. Also killall -STOP firefox and killall -STOP "Web Content" are handy if the swapstorm is still under way.

Building GDB on a freshly installed machine FAQ

So you just installed Fedora, RHEL or CentOS and now you want to build GDB from source.

How do you make sure everything you need to build it is installed?
```
# dnf builddep gdb
```
Did it say, No such command: builddep? Do this, then try again:
```
# dnf install dnf-plugins-core
```
Did it say, dnf: command not found…? You’re using yum, try this:
```
# yum-builddep gdb
```
Did it say, yum-builddep: command not found…? Do this, then try again:
```
# yum install yum-utils
```

Thank you, you’re welcome.

Python hacking

Python‘s had this handy logging module since July 2003. A lot of things use it, so if you’re trying to understand or debug some Python code then a handy snippet to insert somewhere is:

import logging
logging.basicConfig(level=1)

Those two lines cause all loggers to log everything to the console. Check out the logging.basicConfig docs to see what else you could do.