30353 2009-10-14 04:19:21 -0700 [GStreamer] Race condition causing deadlocks 2009-10-15 07:16:36 -0700 1 1 1 Unclassified WebKit Media 528+ (Nightly build) PC Linux RESOLVED FIXED P2 Normal --- 1 slomo webkit-unassigned commit-queue pnormand oldest_to_newest 154554 0 slomo 2009-10-14 04:19:21 -0700 Hi, currently there's a race condition in the GStreamer video sink. Problem is, if unlock() is called and then render(). It would wait forever on the cond. Attached patch fixes this. 154555 1 41156 slomo 2009-10-14 04:24:53 -0700 Created attachment 41156 0001-Fix-race-condition-in-unlock-render-that-would-lead-.patch 154556 2 41157 otte 2009-10-14 04:27:34 -0700 Created attachment 41157 Stacktrace showing the deadlock 154783 3 41156 gustavo 2009-10-15 06:46:19 -0700 Comment on attachment 41156 0001-Fix-race-condition-in-unlock-render-that-would-lead-.patch Man, threading is hairy =). So, what's causing the deadlock, exactly, again? The cond_wait in render and the mutex_lock in timeout_func racing when gstreamer fires ::unlock? Then you fix it by avoiding creating the timeout and doing the cond_wait in the first place if ::unlock() has fired on the element, is that it? Can you add a comment block somewhere explaining this? 154785 4 41223 slomo 2009-10-15 06:57:43 -0700 Created attachment 41223 0001-Fix-race-condition-in-unlock-render-that-would-lead-.patch 154787 5 41223 gustavo 2009-10-15 07:01:05 -0700 Comment on attachment 41223 0001-Fix-race-condition-in-unlock-render-that-would-lead-.patch Thanks! 154790 6 41223 commit-queue 2009-10-15 07:16:33 -0700 Comment on attachment 41223 0001-Fix-race-condition-in-unlock-render-that-would-lead-.patch Clearing flags on attachment: 41223 Committed r49623: <http://trac.webkit.org/changeset/49623> 154791 7 commit-queue 2009-10-15 07:16:36 -0700 All reviewed patches have been landed. Closing bug. 41156 2009-10-14 04:24:53 -0700 2009-10-15 06:57:43 -0700 0001-Fix-race-condition-in-unlock-render-that-would-lead-.patch 0001-Fix-race-condition-in-unlock-render-that-would-lead-.patch text/plain 5232 slomo RnJvbSAzOWIyY2YwZmJiZDFlMDMwYjNmZjY1OGMzMzNmMWEzNmQ5NjcwYjcxIE1vbiBTZXAgMTcg MDA6MDA6MDAgMjAwMQpGcm9tOiA9P1VURi04P3E/U2ViYXN0aWFuPTIwRHI9QzM9QjZnZT89IDxz ZWJhc3RpYW4uZHJvZWdlQGNvbGxhYm9yYS5jby51az4KRGF0ZTogV2VkLCAxNCBPY3QgMjAwOSAx MzowODoxOCArMDIwMApTdWJqZWN0OiBbUEFUQ0ggMS8yXSBGaXggcmFjZSBjb25kaXRpb24gaW4g dW5sb2NrL3JlbmRlciB0aGF0IHdvdWxkIGxlYWQgdG8gZGVhZGxvY2tzLgoKICAgICAgICAqIHBs YXRmb3JtL2dyYXBoaWNzL2d0ay9WaWRlb1NpbmtHU3RyZWFtZXIuY3BwOgogICAgICAgICh3ZWJr aXRfdmlkZW9fc2lua190aW1lb3V0X2Z1bmMpOgogICAgICAgICh3ZWJraXRfdmlkZW9fc2lua19y ZW5kZXIpOgogICAgICAgICh1bmxvY2tfYnVmZmVyX211dGV4KToKICAgICAgICAod2Via2l0X3Zp ZGVvX3NpbmtfdW5sb2NrKToKICAgICAgICAod2Via2l0X3ZpZGVvX3NpbmtfdW5sb2NrX3N0b3Ap OgogICAgICAgICh3ZWJraXRfdmlkZW9fc2lua19zdG9wKToKICAgICAgICAod2Via2l0X3ZpZGVv 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