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List: kde-windows
Subject: Re: KPixampCache crash
From: "Christian Ehrlicher" <Ch.Ehrlicher () gmx ! de>
Date: 2007-08-23 13:20:47
Message-ID: 20070823132047.142860 () gmx ! net
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> Von: "Jarosław Staniek"
> Rivo Laks pisze:
>
> > Ühel kenal päeval (neljapäev 23 august 2007) kirjutasid sa:
> > > Hello,
> > > On first run, cache files in ~/.kde/cache-hostname/kpc are created.
> Then,
> > > on second run, KPixmapCache opens and tries to mmap the data file. Then
> I
> > > got the crash under win2000, msvc.net, fresh kdelibs and Qt. Have
> anyone
> > > encountered this or is the cache is working for you on win32?
> > >
> > >
> > > msvcr71d.dll!memcpy(unsigned char * dst=0x00000019, unsigned char *
> > > src=0x00d9f7ac, unsigned long count=4) Line 218 Asm
> > [...]
> > > kdeui.dll!KIconCache::setThemeInfo(const QList<KIconTheme *> &
> > > themes={...}) Line 260 C++
> > [...]
> >
> > It looks like KPCMemoryDevice has an invalid memory pointer (0
> perhaps?).
> > I committed a small fix for KPCMemoryDevice which adds virtual keywords
> that
> > were previously missing. Maybe that has some effect for Windows.
> > Also, the attached patch prints out memory address returned by mmap()
> and
> > checks for null pointer (although mmap() should never return 0). Could
> you
> > svn up, apply the patch and retry?
>
> Thanks for your reply. Condition checked in your patch is not used in my
> case
> as void* indexMem = mmap(0, info->available, PROT_READ | PROT_WRITE,
> MAP_SHARED, info->file->handle(), 0); returns indedxMem == -1, what's
> already
> covered.
> Sorry for not tracking this down before, but now I can see mmapping is
> somewhat broken not at your level. We already are aware of this and will
> investigate this later.
>
> In the patch below I have:
> 1. Used USE_MMAP everywhere instead of HAVE_MMAP (OK?)
> 2. Disabled using mmap for Windows (temporarily I suppose)
> 3. I've added some fixes so even if mmap is enabled on Windows, the cache
> now
> will not crash.
>
That's fine - altough it's currently only crashed on windows, it can not work on \
other platforms too as QFile::handle() can be everything but the correct handle \
needed for mmap(). It's just luck that it works on other platforms.
Christian
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