It might be a pulseaudio thing... I wouldn't even be able to begin to
know how to trace it (and frankly I'm just not that helpful).

What I _can_ confirm is that I have had this issue in both Ubuntu
versions 9.04 and 10.04, I _do_ use primarily pulseaudio, and this
happens to VLC maybe one out of twenty times, regardless of whether it's
an MP3 or AVI file playing (or any other format, really).

To cite the most recent example, I was playing a white noise soundtrack
all night last night while I slept, using the VLC looping feature
(although this has happened to me in the past even when NOT using the
looping feature). No problems by the time I woke up and logged in.
Shortly after I _paused_ the sample, vlc starting gobbling up memory.

Fortunately, this time I was able to fall back into tty1 in time to save
the session before it got so unbelievably mired that I could no longer
give commands. It took me approximately fifteen minutes of waiting to
get to a command prompt (on a machine with 8GB of RAM and no swap). As
soon as I determined with top that it was vlc and killed the offending
vlc process, the machine came back to life.

Fix it or don't... I've replaced the binary with a shell script pointing
to the actual binary, but with a ulimit of one gig for virtual mem, so
it's not really a problem for me anymore. I'm just glad I finally
figured out what's been crashing my machine so much lately.

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https://bugs.launchpad.net/bugs/673462

Title:
  vlc: growing memory usage when reading some AVI files

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