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List:       kfm-devel
Subject:    Bug#12769: marked as done (Konquer cache corruption - cache unusable) by Daniel Naber <daniel.naber@
From:       owner () bugs ! kde ! org (Stephan Kulow)
Date:       2001-06-15 12:48:03
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Your message with subj: Konquer cache corruption - cache unusable

I cannot reproduce this bug and it seems like nobody else can (it's so old 
and no one commented), so I'm closing it

-- 
Daniel Naber, Paul-Gerhardt-Str. 2, 33332 Guetersloh, Germany
Tel. 05241-59371, Mobil 0170-4819674

has caused the attached bug report to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what I'm
talking about this indicates a serious mail system misconfiguration
somewhere.  Please contact me immediately.)

Stephan Kulow
(administrator, KDE bugs database)

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Date: Thu, 12 Oct 2000 19:26:58 -0400
From: John Califf <jcaliff@compuzone.net>
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Subject: Konquer cache corruption - cache unusable
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Package: konqueror kio
Version: latest snapshots - 11 October 2000

Severity:  Critical

Description:

When visiting certain web sites (repeatable) with cache size larger than
0 Konqueror starts getting 404 file not found error messages.  From
there on, more and more sites, even those previously visited during the
same session, get 404 messages until everything does and nothing loads.

One such site is Gnome Foundation's web site - Freshmeat also can
sometimes cause this problem.  The problems start after visiting such
sites and then visiting any other site or going back to another site.

Workaround:

The problem can be worked around simply by setting the cache size to
zero.  Konqueror is still pretty fast with most sites even without a
cache.  However, few users will associate these errors with an
increasingly corrupted cache.  Therefore I regard the bug as critical,
because the cache gets more and more corrupted without any indication to
the user that the cache is causing critical problems - failure of
Konqueror to load any pages, eventually.

Speculation:

The Gnome Foundation site and some others that cause cache corruption
use 8 bit RGB png images. I've noticed that starting about a month ago
Kde can't display certain types of png images, specifically 8 bit RGB
non-interlaced.  It can display indexed pngs such as are used on most
web sites, but not the RBG's of 8 bits depth. This is really a qt
problem, not a kde problem.  To test, I tried the qt example program
"showimg" and it returns the following error when trying to view such
pngs - "libpng error - too many IDAT's found."
note: this is with the very latest Qt 2.2.1 compiled with -system-libpng
using Qt's zlib.  Using or not using system-zlib makes no difference.

There's nothing wrong with my libpng as these images show up fine with
non-Qt based viewers and in Mozilla.  They don't show up in Netscape
4.75 but don't cause file not found errors like Konqueror gives. My
libpng version is 1.05.  Maybe if I used Qt's own version of libpng this
problem would go away, but it takes along time to recompile.  I will try
again, but then if that really is the problem the compile flags for Qt
need to require using Qt's png and zlib only - and need to disallow
system libpng and zlib flags.

John

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