[Okular-devel] TextDocument Multithreading

[Jaydeep Solanki]

Running it under helgrind, gives
this<https://www.dropbox.com/s/5v3bh1v6le8adkr/helg.txt>output.

It shows a warning near the region where we get a crash saying "*conflicts
with a previous write of size 4 by thread #4*", L117 in helgrind output file

Also, can you please throw some light on what the warning is trying to say.
What is a 'conflict on previous write' ?


On Mon, Sep 23, 2013 at 1:40 PM, Jaydeep Solanki <jaydp17 at gmail.com> wrote:

>
>
>
> On Mon, Sep 23, 2013 at 3:17 AM, Albert Astals Cid <aacid at kde.org> wrote:
>
>> El Dilluns, 23 de setembre de 2013, a les 02:05:23, Jaydeep Solanki va
>> escriure:
>> > On Sun, Sep 22, 2013 at 9:21 PM, Albert Astals Cid <aacid at kde.org>
>> wrote:
>> > > El Dissabte, 21 de setembre de 2013, a les 23:16:56, Jaydeep Solanki
>> va
>> > >
>> > > escriure:
>> > > > On Sat, Sep 21, 2013 at 9:25 PM, Albert Astals Cid <aacid at kde.org>
>> > >
>> > > wrote:
>> > > > > El Dissabte, 21 de setembre de 2013, a les 14:50:50, Jaydeep
>> Solanki
>> > > > > va
>> > > > >
>> > > > > escriure:
>> > > > > > Hi,
>> > > > >
>> > > > > Hi
>> > > > >
>> > > > > > @Albert,
>> > > > > > Welcome back :)
>> > > > >
>> > > > > Thanks :-)
>> > > > >
>> > > > > > As you might be aware GSoC is coming to an end, I want to wrap
>> > > > > > things
>> > > > > > up.
>> > > > > >
>> > > > > > I have a few days, and I want to finish multi-threading support
>> for
>> > > > > > ePubs
>> > > > > > before GSoC ends. I have created a patch, but it crashes
>> sometimes,
>> > >
>> > > I'm
>> > >
>> > > > > > unable to find a reason to that.
>> > > > >
>> > > > > Where's the patch?
>> > > >
>> > > > Diff attached
>> > > >
>> > > > File to test on :
>> > > > link<
>> > >
>> > >
>> https://www.dropbox.com/s/x63kkjf8q4h4fdy/Getting%20Gold%20by%20J_C_F_J
>> > >
>> > > > ohnson.epub>
>> > > >
>> > > > > Do you have a backtrace of the crash?
>> > > >
>> > > > I have got two different backtraces, using the same ePub
>> > > >
>> > > > Backtrace 1 : http://paste.kde.org/p0b9a1e1e/
>> > > >
>> > > > Backtrace 2 : http://paste.kde.org/pa4e31b12/
>> > >
>> > > Any reason you have not installed debug symbols for Qt to get a better
>> > > bracktrace (less ??)?
>> >
>> > Installed it.
>> > still I'm not able to make any sense out of it.
>> >
>> > Updated backtrace :  http://paste.kde.org/pa8f27933/
>>
>> How are you getting the backtrace?
>
> I use Qt Creator, when it crashes I use create full backtrace option to
> get this backtrace.
> Further more using gdb + terminal I get this<http://paste.kde.org/p11fad1cf/>backtrace.
>
> Can you mark in which thread the crash is
>> happening?
>>
> I get an ABORT signal when TextDocumentGeneratorPrivate::createTextPage(.
> . .) is called inside core/textdocumentgenerator.cpp. Now inside that 99%
> of the times I get a crash on L81 (my branch).
>
>>
>> Cheers,
>>   Albert
>>
>> >
>> > > Cheers,
>> > >
>> > >   Albert
>> > >
>> > > > > What has changed
>> > > > > since last time we tried to do this?
>> > > >
>> > > > I have noticed that it only crashes when the epub has an adequate
>> amount
>> > >
>> > > of
>> > >
>> > > > images. Epubs with no images or 1 or 2 images are less likely to
>> crash.
>> > >
>> > > The
>> > >
>> > > > more the images the more likely it is to crash.
>> > > >
>> > > > Now we don't have to guess if it will crash on this file or not.
>> > > > Considering all this, I have given you an ePub that is most likely
>> to
>> > >
>> > > crash
>> > >
>> > > > atleast once before completing a round trip (top to bottom & bottom
>> to
>> > > > top).
>> > > >
>> > > > > Cheers,
>> > > > >
>> > > > >   Albert
>> > > > >
>> > > > > > So, can we please help, me get this done.
>> > > > > > It's the same bug that we once tried to fix on IRC.
>> > > > > >
>> > > > > > I'll be available on #okular, same time as usual.
>> > > > > >
>> > > > > > Cheers,
>> > > > > > Jaydeep
>> > > > >
>> > > > > _______________________________________________
>> > > > > Okular-devel mailing list
>> > > > > Okular-devel at kde.org
>> > > > > https://mail.kde.org/mailman/listinfo/okular-devel
>> > >
>> > > _______________________________________________
>> > > Okular-devel mailing list
>> > > Okular-devel at kde.org
>> > > https://mail.kde.org/mailman/listinfo/okular-devel
>>
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