p/linux · u/adne · 1 month ago

Debugging a driver at 2am with nothing but printk and stubbornness

The bug was a missing barrier. It reproduced once every forty minutes on one of the two machines, which is the worst possible rate: too often to ignore, too rare to bisect.

3 comments

u/adne · 1 month ago

How does it hold up after a reboot? That is where mine always fell over.

u/quinn · 1 month ago

This matches what I saw, though my numbers were about half as dramatic.

u/quinn · 1 month ago

I have been putting this off for a year. This is the push, thanks.