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bug#7190: Crash in menus on w32


From: grischka
Subject: bug#7190: Crash in menus on w32
Date: Wed, 13 Oct 2010 16:03:30 +0200
User-agent: Thunderbird 2.0.0.23 (Windows/20090812)

Lennart Borgman wrote:
On Wed, Oct 13, 2010 at 1:02 PM, grischka <address@hidden> wrote:
I assume that their is either a logical problem with the code inside
Emacs or a bad assumption on how menu callbacks are actually run.
Is there a difference between logical problem and bad assumption?

Yes. The code could be correct under some bad assumptions regarding
the way the interface to the OS works.

Is not that an important difference?

Not if you want to fix the bug.

By
adding DebPrint call we could perhaps see if some code where called in
an order we did not expect.
Perhaps see the information that you already have?  For example
 #7  0x011c4e4b in w32_free_submenu_strings (menu=0x205e3) at w32menu.c:1701
is telling where is "some code", and
 "Invalid Address specified to RtlFreeHeap( 00850000, 0088BDC8 )"
is telling about "order we did not expect", as likely in:  Called
twice for the same memory object.  If in doubt, try to prove that
it can't happen.

Yes, perhaps. But it could also be that memory objects are freed in an
order we did not expect.


Why should it matter in what order "Invalid Address" is passed to free?






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