Re: BUG-lockdep and freeze (was: Arrr! Linux 2.6.18)


* Linus Torvalds <torvalds@xxxxxxxx> wrote:

It could - and _should_ dammit! - do some basic sanity tests like "is
the thing even in the same stack page"? But nooo... It seems
_designed_ to be fragile and broken.

Here's a simple test: if the next stack-slot isn't on the same page,
the unwind information is bogus unless you had the IRQ stack-switch
signature there. Does the code do that? No. It just assumes that
unwind information is complete and perfect.

fully agreed - i have pointed out areas of conceptual fragility to Jan
early on:

http://lkml.org/lkml/2006/6/2/59

(but AFAICS i got no reply to that mail - i missed that in the lockdep
flurry.)

Ingo
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