On Mon, 2010-11-15 at 14:13 -0500, Christine Spang wrote: > On Sun, Nov 14, 2010 at 11:23:42AM -0500, Mike Paul wrote: > > I was going to take a shot at debugging this today, since it's on the RC > > bug list for squeeze, but it seems to have resolved itself at some > > point, at least in unstable. QL starts without errors, and it's playing > > music right now. > > > > The last time I tried it was weeks ago, so unfortunately I don't know > > which of the many package updates between then and now was responsible > > for the change. I also don't have a system running squeeze, so I can't > > test whether it works there. But it's working for me in sid. > > Thanks for taking a look at this, Mike! Were you able to > reproduce this bug before? > > Ian, can you still reproduce this bug?
I'm afraid so.
I reverted my hacky patch and the issue reoccurred.
The system was pretty out of date so I did an aptitude upgrade, which
unfortunately didn't help (aptitude upgrade log appended anyway).
I didn't think it was worth logging out and back in again or anything
like that, but I can try if someone thinks it is worth a go.
> I'm hesitant to close this bug without hearing from Ian, but
> perhaps downgrading it would be appropriate since I have yet
> to encounter someone else who is able to reproduce, which
> suggests that it only appears (appeared?) in very limited
> circumstances.
I think this bug probably more correctly belongs to the gst python
bindings (or maybe the gobject bindings framework generally), since I
can't see how this can be expected to work correctly unless they
explicitly take action to integrate the gobject/gst reference counting
of the C objects with python's reference counting when adding objects to
queues (or whatever, I'm not that familiar with gst terminology). It can
be worked around in the python user of the bindings by keeping extra
python references to the objects in question, as my hacky patch does,
but that doesn't seem right to me.
I suspect the ability to reproduce the issue depends somewhat on the
pattern of other memory allocations going on etc since that will effect
how quickly the erroneously freed memory gets reused (if at all), which
might explain away the small number of people who are seeing this. I
tried (reasonably hard) to construct a smaller test case which exhibited
the problem but I was unable to do so.
Does python have a debugging facility which will explicitly poison
memory on free? Since this issue is in the C bindings perhaps it
wouldn't help much without explicit bindings support.
Perhaps a similar facility exists in gobject and would be more use here?
G_DEBUG=gc-friendly looks pretty close, does that help anyone else
reproduce? (it seem to need a debug version of glib)
Valgrind might also help, a bit of a long shot though.
Ian.
Aptitude 0.6.3: log report
Mon, Nov 15 2010 19:39:16 +0000
IMPORTANT: this log only lists intended actions; actions which fail due to
dpkg problems may not be completed.
Will install 81 packages, and remove 9 packages.
28.6 MB of disk space will be freed
===============================================================================
[REMOVE, NOT USED] libqt4-assistant
[REMOVE, NOT USED] libqt4-help
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[REMOVE, NOT USED] libqt4-test
[REMOVE, NOT USED] python-qt4
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[REMOVE, NOT USED] python-reportlab
[REMOVE, NOT USED] python-reportlab-accel
[REMOVE, NOT USED] python-sip
[HOLD] gthumb
[HOLD] gthumb-data
[HOLD] lvm2
[UPGRADE] acpid 1:2.0.6-1 -> 1:2.0.6-2
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===============================================================================
Log complete.
--
Ian Campbell
Poverty must have its satisfactions, else there would not be so many poor
people.
-- Don Herold
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