[Webkit-unassigned] [Bug 134284] New: REGRESSION (r170325): UI process crashes in lastCommittedLayerTreeTransactionID() when the Web Content process crashes

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=134284

           Summary: REGRESSION (r170325): UI process crashes in
                    lastCommittedLayerTreeTransactionID() when the Web
                    Content process crashes
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P1
         Component: WebKit2
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: mitz at webkit.org
                CC: benjamin at webkit.org


After the Web Content process crashes, setting its scroll view’s content offset causes a crash:

* thread #1: tid = 0x1dd4a6, 0x000000011c5bf57c WebKit`WebKit::RemoteLayerTreeDrawingAreaProxy::lastCommittedLayerTreeTransactionID(this=0x0000000000000000) const + 12 at RemoteLayerTreeDrawingAreaProxy.h:53, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0xe8)
  * frame #0: 0x000000011c5bf57c WebKit`WebKit::RemoteLayerTreeDrawingAreaProxy::lastCommittedLayerTreeTransactionID(this=0x0000000000000000) const + 12 at RemoteLayerTreeDrawingAreaProxy.h:53
    frame #1: 0x000000011c5bcde7 WebKit`-[WKContentView didUpdateVisibleRect:unobscuredRect:unobscuredRectInScrollViewCoordinates:scale:minimumScale:inStableState:isChangingObscuredInsetsInteractively:](self=0x00007ff6bac4a050, _cmd=0x000000011cb9f238, visibleRect=<unavailable>, unobscuredRect=<unavailable>, unobscuredRectInScrollViewCoordinates=<unavailable>, zoomScale=1, minimumScale=1, isStableState=true, isChangingObscuredInsetsInteractively=false) + 583 at WKContentView.mm:306
    frame #2: 0x000000011c3799a5 WebKit`-[WKWebView _updateVisibleContentRects](self=0x00007ff6bc872a50, _cmd=0x000000011cb9f0ed) + 1893 at WKWebView.mm:1309
    frame #3: 0x000000011c373526 WebKit`-[WKWebView _didInvokeUIScrollViewDelegateCallback](self=0x00007ff6bc872a50, _cmd=0x000000011cba0e10) + 86 at WKWebView.mm:638
    frame #4: 0x000000011c8df3d5 WebKit`-[WKScrollViewDelegateForwarder forwardInvocation:](self=0x00007ff6bc883aa0, _cmd=0x000000011265d104, anInvocation=0x00007ff6bae83030) + 309 at WKScrollView.mm:89

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