41340 2010-06-29 03:56:48 -0700 [GStreamer] Subtle race condition during seeks 2010-07-09 08:26:31 -0700 1 1 1 Unclassified WebKit Media 528+ (Nightly build) PC OS X 10.5 RESOLVED FIXED P2 Normal --- 1 slomo webkit-unassigned commit-queue gustavo pnormand slomo webkit.review.bot oldest_to_newest 244189 0 slomo 2010-06-29 03:56:48 -0700 Hi, attached patch fixes a race condition in WebKitWebSourceGStreamer. The problem here is, that the callback from g_timeout_add() could be called before g_timeout_add() returns. This causes the seekID timeout ID to be set by 0 by the callback and afterwards to the timeout ID of the already called callback. This problem looks rather obscure but can really easy happen on multicore systems and causes the playback to stop. The other, more minor problem, that is fixed by this patch is, that the source *must* not emit EOS if the HTTP stream finishes during a seek. Due to the multiple threads involved here this confuses GStreamer's appsink and again causes the playback to stop. 244191 1 slomo 2010-06-29 03:57:52 -0700 The same can in theory happen for the other GTimeouts 244192 2 60002 slomo 2010-06-29 04:01:25 -0700 Created attachment 60002 0001-Bug-41340-GStreamer-Subtle-race-condition-during-see.patch 244193 3 webkit.review.bot 2010-06-29 04:03:21 -0700 Attachment 60002 did not pass style-queue: Failed to run "['WebKitTools/Scripts/check-webkit-style', '--no-squash']" exit_code: 1 WebCore/ChangeLog:17: Line contains tab character. [whitespace/tab] [5] WebCore/ChangeLog:18: Line contains tab character. [whitespace/tab] [5] WebCore/ChangeLog:19: Line contains tab character. [whitespace/tab] [5] WebCore/ChangeLog:20: Line contains tab character. [whitespace/tab] [5] WebCore/ChangeLog:21: Line contains tab character. [whitespace/tab] [5] WebCore/ChangeLog:22: Line contains tab character. [whitespace/tab] [5] WebCore/ChangeLog:23: Line contains tab character. [whitespace/tab] [5] Total errors found: 7 in 2 files If any of these errors are false positives, please file a bug against check-webkit-style. 244212 4 pnormand 2010-06-29 05:04:50 -0700 This looks good to me. I will test the patch later on. For the ChangeLog you can remove the "No new test" line. Also please add a link to the bug. I usually prefill the entry with prepare-ChangeLog --bug 1234 [--git-commit 0123a] :) 244248 5 pnormand 2010-06-29 06:15:45 -0700 Tested the patch. Without I could see the video pause just after the video "ad"... With the patch playback is smooth, no pausing 244253 6 pnormand 2010-06-29 06:20:33 -0700 (In reply to comment #5) > Tested the patch. Without I could see the video pause just after the video "ad"... With the patch playback is smooth, no pausing Also tried seeking :) 244687 7 60100 slomo 2010-06-30 01:49:40 -0700 Created attachment 60100 0001-Bug-41340-GStreamer-Subtle-race-condition-during-see.patch Better? :) 244692 8 pnormand 2010-06-30 01:59:35 -0700 Yes, style bot is green, CCing Gustavo :) 248281 9 60100 gustavo 2010-07-08 09:49:50 -0700 Comment on attachment 60100 0001-Bug-41340-GStreamer-Subtle-race-condition-during-see.patch WebCore/platform/graphics/gstreamer/WebKitWebSourceGStreamer.cpp:347 + priv->paused = FALSE; The change makes sense to me, but this one seems to have been left out by mistake? 248399 10 60922 slomo 2010-07-08 11:58:52 -0700 Created attachment 60922 0001-Bug-41340-GStreamer-Subtle-race-condition-during-see.patch 248409 11 60922 gustavo 2010-07-08 12:03:55 -0700 Comment on attachment 60922 0001-Bug-41340-GStreamer-Subtle-race-condition-during-see.patch Looks fine now, thanks! 249023 12 60922 commit-queue 2010-07-09 08:26:26 -0700 Comment on attachment 60922 0001-Bug-41340-GStreamer-Subtle-race-condition-during-see.patch Clearing flags on attachment: 60922 Committed r62955: <http://trac.webkit.org/changeset/62955> 249024 13 commit-queue 2010-07-09 08:26:31 -0700 All reviewed patches have been landed. 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