I'm seeing really horrible jank on recent nightlies (perhaps about a week or so). This is on all three platforms: Windows, Mac and Linux. My browser hangs for several seconds at a time every couple of minutes. (I haven't pinned down the exact intervals here.) I installed about:jank on Mac and Win, the Windows report looks like: about:jank results (22845 samples) 6721 - c-GC::GarbageCollectNow 5948 - c-bookmarks::RunInBatchMode 2530 - c-bookmarks::RemoveFolderChilder 2371 - c-storage::Statement::ExecuteStep 1242 - c-Timer::Fire 964 - c-gfx::DrawThebesLayer 773 - c-event::nsViewManager::DispatchEvent 576 - c-CSS::ProcessRestyles 281 - c-network::nsHttpChannel::OnDataAvailable 270 - c-layout::FlushPendingNotifications 264 - c-layout::DoReflow 226 - c-JS::CallEventHandler 164 - c-network::nsHttpChannel::OnStopRequest 149 - c-GC::CycleCollectNow 145 - c-content::nsXMLHttpRequest::OnStopRequest 103 - c-JS::EvaluateString 39 - c-Paint::PresShell::Paint 29 - c-AnnotationService::SetItemAnnotation 24 - c-nsInputStreamPump::OnStateStart 12 - c-Input::DispatchMouseEvent 8 - c-image::imgFrame::Draw 2 - c-html5::RunFlushLoop 2 - c-nsObjectFrame::InstantiatePlugin 1 - c-JS::EvaluateStringWithValue 1 - c-layout::nsLayoutUtils::DrawBackgroundImage

cc'ing marco for the bookmarks stuff. that's not usual. ted: do you run sync? have you made any recent changes lately? running sync on mobile?

I do run sync. I have two desktops and a laptop syncing. I don't run sync on mobile currently, I have in the past (with XUL Fennec, a while ago).

I don't recall making any changes lately. I do most of my browsing on the Windows machine, but a fair amount on my Mac, and occasional browsing on Linux.

So, this is a dupe of bug 722188. that said, there must have been some threading/mutex change lately. My best bet is the SQLite upgrade. Would be nice to fetch which query is on the async htread holding the mutex when this happens, if possible, if we don't find that information we can backout the sqlite upgrade from aurora, at least.

(In reply to Marco Bonardo [:mak] from comment #4) > So, this is a dupe of bug 722188. that said, there must have been some > threading/mutex change lately. My best bet is the SQLite upgrade. > Would be nice to fetch which query is on the async htread holding the mutex > when this happens, if possible, if we don't find that information we can > backout the sqlite upgrade from aurora, at least. We should be able to do this when bug 719777 is done.

Otherwise, the slow sqlite query stuff might show it.

(In reply to Jeff Muizelaar [:jrmuizel] from comment #6) > Otherwise, the slow sqlite query stuff might show it. yes, about:telemetry. Though that presumes you don't kill the process when it hangs.