Из документации ядра Linux

Documentation/kernel-hacking/locking.rst:

Overzealous Prevention Of Deadlocks
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Deadlocks are problematic, but not as bad as data corruption. Code which
grabs a read lock, searches a list, fails to find what it wants, drops
the read lock, grabs a write lock and inserts the object has a race
condition.

If you don't see why, please stay the fuck away from my code.

Также в когда-то давно в одном из драйверов встречал комментарий вроде:
"I tried to understand what this code does, but couldn't. It does work though, so I left it as it is."