Revision as of 22:00, 29 September 2011

This is a working page to track all activities and analysis related to hang issues in the Firefox Desktop.

Background

Currently there are 2 classes of hangs
- There are plugin hangs which we catch and receive a plugin and browser side crash report.
- There are browser hangs which we really have no visibility into.

We have little visibility around issues when the browser hangs but we have several activities in the works to investigate this further.

bug 429592 - We are working on a patch to catch these types of hangs. Andreas proposed a patch but don't have agreement within development that this will work. Bsmedberg and Andreas are discussing.
Release Management is working on a project to investigate winqual reports that are generated when the user kills the browser.
We are following up on a number of anecdotal instances of hang issues with Firefox. Marcia in QA is helping out and we are putting together some instructions we can circulate that will help us catch hang information in certain cases.

There are a number of bugs that relate to hang issues that we are investigating.

bug 686025 - Startup crash/hang reported by Blizzard. We actually have a patch for this that's waiting review. It's being tracked for FF8 and FF9.
bug 687610 - [10.6] QuickTime hangs FF while trying to play a sound from the plugin process. We have some STR and a dev involved to help resolve the issue.

There are a number of things we are doing to track plugin hangs.

We have a number of reports that breakdown hangs with Flash for various versions
Data point for Sep 28th, 2011 - 14% of all crash issues were hangs in the plugin process.
85% of our hangs happen in the Flash process - Flash hangs in versions 4.0 and higher
- Keep in mind that not everybody updates to the most recent version of Flash so some of our problems are happening in older versions but have since been fixed.
The crashkill team is putting together an updated list of current Flash related hangs and will work to get some traction on them.

bug 651192 - Implement new AsyncDrawing model for plugins. This involves removing support for windowed plugins since they cause hangs. Hangs don't happen with windowless plugins and we'd like everything to be windowless for other reasons as well. We can't really remove windowed plugins until we have an alternative and this bug represents part #1 of that.
- Status: Talking to Josh, we made some progress on this but not much. Work will probably resume in another month of so.

@@ Line 12: / Line 12: @@
 * {{Bug|429592}} - We are working on a patch to catch these types of hangs. Andreas proposed a patch but don't have agreement within development that this will work. Bsmedberg and Andreas are discussing.
 * Release Management is working on a project to investigate [https://wiki.mozilla.org/Release_Management/WER_Investigation winqual] reports that are generated when the user kills the browser.
+* We are following up on a number of anecdotal instances of hang issues with Firefox. Marcia in QA is helping out and we are putting together some instructions we can circulate that will help us catch hang information in certain cases.
 ==Bugs==
@@ Line 17: / Line 18: @@
 * {{Bug|686025}} - Startup crash/hang reported by Blizzard. We actually have a patch for this that's waiting review. It's being tracked for FF8 and FF9.
 * {{Bug|687610}} - [10.6] QuickTime hangs FF while trying to play a sound from the plugin process. We have some STR and a dev involved to help resolve the issue.
-* We are following up on a number of anecdotal instances of hang issues with Firefox. Marcia in QA is helping out and we are putting together some instructions we can circulate that will help us catch hang information.
 =Plugin Hangs=