[Bug 24549] Firestarter Demo crashes on exit when mouse is moved.

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=24549

--- Comment #8 from Julian Seward <jseward at acm.org> 2010-10-19 07:13:01 CDT ---
(In reply to comment #7)

> We use signal stacks for this reason. [...]

Well, fair enough.  Nevertheless it does cause problems when
Valgrinding Windows apps on Wine, for two reasons

* the errors need to be suppressed, which is extra effort,
  hassle, etc, and can also be slow if it happens millions
  of times

* when the data is read from below %esp, Memcheck's default rules
  assume the data is initialised [1].  Hence if the stored value was
  uninitialised it will be reloaded as initialised, so an outside
  chance of false negatives.

I looked at the fn and it doesn't look difficult to ensure there is no
below-%esp accesses.  Is there some reason why the function has this
particular below-%esp accesses, or is it just an accident of history?


[1]  Yes, I know this sounds stupid.  See
http://www.valgrind.org/docs/manual/mc-manual.html#mc-manual.together
8th bullet point for rationale.

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