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List: kde-core-devel
Subject: Re: strange effect with --enable-fast-malloc=full
From: Falk Brettschneider <gigafalk () yahoo ! com>
Date: 2002-04-16 13:28:01
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Hi!
Lubos Lunak wrote:
>On út 16. duben 2002 14:07, Falk Brettschneider wrote:
>
>>Hi!
>>
>>I tried to compile KDE_3_0_BRANCH with using the
>>--enable-fast-malloc=full flag in configure, first for kdecore only,
>>second for the whole kdesupport, kdelibs, kdebase.
>>But now always I got a strange effect when closing my KDE application.
>>Somehow it hangs forever in an infinite loop somewhere in malloc.
>>Whenever I interrupt it in gdb, it shows the same callstack:
>> http://www.geocities.com/gigafalk/strange.jpg
>>
>
> Hmm. The backtrace is completely useless - the only 3 things I can see is
>that 1) the backtrace ends in malloc(), 2) you don't have libkdecore with
>debug info
>
sorry, now I recompiled kdecore with debug info and I saw it loops back
in line 2963 of malloc.c because there's always a p != 0.
> even though you have it in libqt and 3) you use Keramik. Could you
>give me a testcase,
>
it only happens in a closed-source KDE app of the company I work for
here, I can't give you the code or the binary and plugins.
>or find out where exactly in the malloc it loops?
>
I saw in the debugger that nextp is equal to p->fd and p doesn't get a
new pointer within the code block of the while statement. That's why it
loops infinitely. I don't understand what that all means though... Do
you have an idea?
Ciao
F@lk
>
>
> And first of all, could you run the application in valgrind? This malloc
>implementation seems to be more vulnerable to heap corruption, so it may be
>you have a bug somewhere and malloc in glibc gets over it somehow. Your
>second mail just confirms my suspicion. Most probably you're trying to delete
>something twice.
>
I should install valgrind...
Cheers,
F@lk
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