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If a resource is never used as an input, it is not useful.
It's effectively the same as using an integer.
Detect such cases, they are quite confusing.
Fix all existing errors in descriptions.
This uncovered some interesting bugs as well,
e.g. use of a completely unrelated fd subtype after copy-paste
(while the resource that was supposed to be used there is completely unused).
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Disarms the latest reproducer[1] for the discovered "no output from test
machine" panic.
While here, tidy up and improve comments.
[1] https://syzkaller.appspot.com/bug?id=4c3b1ac22d6d7f1d9ebcad5469a28cb4562debda
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This is one of the root causes of the 'no output from test machine'
panic. Issuing a DIOCKILLSTATES ioctl on a /dev/pf file descriptor will
cause state associated with ongoing connections to be purged;
effectively killing the ssh connection to the VM.
Including net/pfvar.h is necessary in order to make use of the
DIOCKILLSTATES define.
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