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List: kwin
Subject: Review Request: Protect animation list iterators against external changes
From: Thomas_Lübking <thomas.luebking () web ! de>
Date: 2013-01-03 23:15:46
Message-ID: 20130103231546.27291.93607 () vidsolbach ! de
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This is an automatically generated e-mail. To reply, visit:
http://git.reviewboard.kde.org/r/108151/
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Review request for kwin and Martin Gräßlin.
Description
-------
I recently started to run into random crashes on the heap and slightly started to fear to have broken \
sth. on activities... whatever.
Turned out* that moving BE::Faded to AnimationEffect and for the very first time actually using \
"animationEnded" to chain animations (fade out -> fade in) would (actually obviously) alter the \
m_animations list what unfortunately turns our nice little iterators into random junk.
So this patch tracks list manipulations (in this case during the iteration calling animationEnded, being \
the natural candidate) and when they happen, re-validates the iterators (the map traversion is required \
due to the internals of QMap/QHash; the list could instead also be accessed by \
entry->first.at(animationCounter) instead; not sure about performance impact but it would have made the \
patch much larger ;-)
* I actually figured it because resizing on fullscreen changes always worked like crap because the window \
gets to resizes in a row (once for the decoration being removed and then the actual resize to the FS \
geometry) what got me multiplicative traslation/scaling. Chaining this made the crashes pretty \
reproducible but the result is pretty cool =)
Diffs
-----
kwin/libkwineffects/kwinanimationeffect.cpp e0a6694
Diff: http://git.reviewboard.kde.org/r/108151/diff/
Testing
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hehe - i un/fullscreened mplayer about a hundred times the last few minutes.
That crashed nearly *each* time before the patch.
Thanks,
Thomas Lübking
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This is an automatically generated e-mail. To reply, visit:
<a href="http://git.reviewboard.kde.org/r/108151/">http://git.reviewboard.kde.org/r/108151/</a>
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<div>Review request for kwin and Martin Gräßlin.</div>
<div>By Thomas Lübking.</div>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Description </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: \
-pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">I recently started to run into random \
crashes on the heap and slightly started to fear to have broken sth. on activities... whatever.
Turned out* that moving BE::Faded to AnimationEffect and for the very first time actually using \
"animationEnded" to chain animations (fade out -> fade in) would (actually obviously) alter \
the m_animations list what unfortunately turns our nice little iterators into random junk.
So this patch tracks list manipulations (in this case during the iteration calling animationEnded, being \
the natural candidate) and when they happen, re-validates the iterators (the map traversion is required \
due to the internals of QMap/QHash; the list could instead also be accessed by \
entry->first.at(animationCounter) instead; not sure about performance impact but it would have made \
the patch much larger ;-)
* I actually figured it because resizing on fullscreen changes always worked like crap because the window \
gets to resizes in a row (once for the decoration being removed and then the actual resize to the FS \
geometry) what got me multiplicative traslation/scaling. Chaining this made the crashes pretty \
reproducible but the result is pretty cool =)</pre> </td>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Testing </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: \
-pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">hehe - i un/fullscreened mplayer about a \
hundred times the last few minutes. That crashed nearly *each* time before the patch.</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
<ul style="margin-left: 3em; padding-left: 0;">
<li>kwin/libkwineffects/kwinanimationeffect.cpp <span style="color: grey">(e0a6694)</span></li>
</ul>
<p><a href="http://git.reviewboard.kde.org/r/108151/diff/" style="margin-left: 3em;">View Diff</a></p>
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