On Jan 10, 2012, at 2:45 PM, Jarred Nicholls wrote: > Hey qtwebkittens, > > My company has charged me with resolving a very nasty issue with QtWebKit > 2.2.1's web inspector interface (built from Qt 4.8.0 source), which locks up > when one pauses script at a breakpoint. > > https://bugs.webkit.org/show_bug.cgi?id=71271 > > CPU on the process goes to 100% and it looks like the EventLoop just runs on > and on (calling QCoreApplication::processEvents), but isn't processing UI > events in the inspector interface at all. > > Before spending much more time trying to analyze this issue and scouring > changesets, has anyone experienced this themself and/or have any indication > of what the issue is or how to fix it? This appears to have been an issue in > the past (https://bugs.webkit.org/show_bug.cgi?id=41142) but I have a trunk > build of QtWebKit @ r84622 (against Qt 4.7.4) that does not have this issue.
Hi Jarred, It might be the issue I fixed recently in my qtwebkit fork---I added support for phantomjs remote debugging, and ran into this exact same thing. Turns out in a few places setting a breakpoint caused processing of the incoming events from the JS side of the debugger to fail. I mentioned my fixes to jturcotte but didn't get much interest---if there is interest I will gladly clean up my patches and get these fixes upstream. Here's the work to see if it fixes for you: 1) Updated Websocket implementation to latest spec to work against a recent chrome/webkit browser: https://gitorious.org/~lfranchi/webkit/lfranchis-qtwebkit/commit/93a72f2657c2a8bb6863d5d2ffe8ce6faedd4598 2) 2 fixes for hanging on breakpoint (one requires the above commit, but is easy enough to apply against trunk if you read the code) https://gitorious.org/~lfranchi/webkit/lfranchis-qtwebkit/commit/4e104bc438c21ef63a6a4227a142d36bf2401b2e https://gitorious.org/~lfranchi/webkit/lfranchis-qtwebkit/commit/1606e202891b856ad0fdae80288ccdbf8d6765e1 The latter two patches I hope should fix your issue. All 3 are also available as a standalone patch against qt 4.8 here: https://github.com/ariya/phantomjs/blob/master/deploy/qt48_fix_inspector.patch cheers, leo -- [email protected] KDAB (USA), LLC [email protected] The KDE Project -- [email protected] KDAB (USA), LLC [email protected] The KDE Project
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