Bug#776172: vlc: crash (segmentation fault) on a webm file

[Sebastian Ramacher]

On 2015-02-15 00:46:46, Vincent Lefevre wrote:
> On 2015-02-14 16:20:39 +0100, Sebastian Ramacher wrote:
> > I can't reproduce it. I've tried to play the URL directly with vlc,
> > downloaded it with youtube-dl and downloaded the webm. It never crashed
> > on normal speed or higher speed.
> 
> I could reproduce it by setting the speed to 3x and the start time
> position to 00:00:06, but it doesn't always crash. It seems that
> the VLC behavior is not deterministic!
> 
> I could also reproduce the crash by resetting to position to 00:00:00
> (or clicking on stop/play), still at speed 3x.
> 
> The crash often occurs near 1:15. But it also occurred just after
> I clicked on stop/play (i.e. just at the beginning of the file).
> 
> Another test: I start "vlc Nosferatu*.webm", then select the 3x speed
> via a click on the speed area at the bottom, then do a sequence of
> stop/play until a crash. The first 3 times, VLC crashed immediately
> after a "play" in the first 5 iterations. The 4th time, I did a
> sequence of several dozens of stop/play, but couldn't make it crash.
> The 5th time, VLC crashed at the 7th iteration. The 6th time, VLC
> crashed at the 6th iteration.

Nope, cannot get it to crash.

> 
> > So without a minimal sample that causes the clash,
> 
> Can VLC can extract a sample that caused the crash?

I am not aware of such a feature.

> > the traceback with -dbg packages installed and a verbose vlc log,
> > there is not much we can do.
> 
> Here's the full backtrace with the debugging symbols. The crash always
> occurs in the same function.

Please also include the output of vlc -vvv.

Cheers
-- 
Sebastian Ramacher
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