Hi!
When running a kind of system test (detach/attach loop in high system load),
"Don't do that, then." :-)
[wonders what real-world scenario that test is supposed to excercise]
He does a TEST to find hidden bugs!
In my practice as a Kernel developer for safety critical systems, I did such
tests a lot for my drivers. You should be happy that someone does such kind of
stress testing and don't make him look like a fool.
Such tests are an appropriate method, beside others, to find design problems or
implementation errors.
Even if you think it is unlikely in a real world example, it may happen to what
ever reason in real world anyway. Think of thousands of installations and of
millions of hours your DRBD driver is used over the world. It then becomes less
unlikely, because of simple statistics. I even have to cope with bit flips due
to natural cosmic radiation in my daily business (mission critical systems for
aero-space). They are also very unlikely.
And when you look to his next eMail, he found a possible not symmetrical
execution of ref-count counting. That is a very common error in Linux Kernel
development and can be avoided by strictly symmetrical function executions by
design. But they are hard to debug and a test he did is a good method to find
such errors.
BR,
Jasmin
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