[vlc-devel] Core input code race condition

[Kaarlo Räihä]

xxcv kirjoitti 03.03.2009 kello 09:08:
> Hi
> 
> I've reported this bug through trac since it is down ATM.
> 
> However, I did try this on 2 machines with success, instead of having 
> courmisch setting keyword to
> unreproducible, I am asking here if anybody else can re-produce this
>  bug.
> Reproducible on XP and Vista.
> 
> Anyway I'm going to describe again about this bug, which exists on 
> vlc.git/master and
> not 0.9-bugfix.
> 
> Here is how-to re-produce the race condition bug,
> 1, add a few audio or video files (prefer video because race condition 
> appears faster)
>     Also prefer to pick different resolution video files as this way 
> resets vout in between items.
> 2, after adding few files to playlist, start playback then keep on 
> pressing "N" every second.
> 3, if successfully trigged the race condition input* will be locked 
> vlc.exe will need to be forced
>     to end process (through task manager) although qt4 interface
>  doesn't 
> hang.
>     If you do trigger this bug please specify your o/s version.
> 
> It seems input thread lock the wrong vout, aout.
> This bug doesn't trigger a crash it only stop the decoding and
>  refuse to 
> create or destroy input.
> It displays first video frame then stalls there, pressing any control 
> buttons through qt4
> interface produce debug message "dying input".
> 
> Please reply to this post if you can re-produce this bug.
> 
> Regards.
> 
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I tested with VLC 1.0.0-git 11th feb 09 and I cannot lock down VLC. Holding down the hotket for next will give some errors to log

VLC can't recognize the input's format:
The format of 'C:\sample.avi' cannot be detected. Have a look at the log for details.
VLC can't recognize the input's format:
The format of 'C:\ricerca.avi' cannot be detected. Have a look at the log for details.
VLC can't recognize the input's format:
The format of 'C:\pstesti.avi' cannot be detected. Have a look at the log for details.

All these video play fine, but something "strange" does happen when the current playlist item is changed too fast.

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