[Webkit-unassigned] [Bug 156750] New: REGRESSION: Mac debug EWS bots freeze

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=156750

            Bug ID: 156750
           Summary: REGRESSION: Mac debug EWS bots freeze
    Classification: Unclassified
           Product: WebKit
           Version: Other
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ap at webkit.org
                CC: dino at apple.com, graouts at apple.com,
                    lforschler at apple.com, ryanhaddad at apple.com,
                    simon.fraser at apple.com

Mac Debug EWS bots have started to all freeze, this already happened twice in two days.

We must have made a change in WebKit that kills graphics, as the problem is that WindowServer hangs.

    +     9732 CGXServer  (in CoreGraphics) + 839  [0x7fff99d962db]
    +       9732 CGXRunOneServicesPass  (in CoreGraphics) + 155  [0x7fff99d95a81]
    +         9732 run_timer_pass  (in CoreGraphics) + 412  [0x7fff99c28fc6]
    +           9732 update_display_callback  (in CoreGraphics) + 59  [0x7fff99e308fc]
    +             9732 MPDisplayDeviceSurfaceIsReady  (in CoreGraphics) + 114  [0x7fff99dd29f7]
    +               9732 IOAccelSurfaceControl  (in IOKit) + 74  [0x7fff955a0329]
    +                 9732 IOConnectCallScalarMethod  (in IOKit) + 111  [0x7fff95595c52]
    +                   9732 io_connect_method  (in IOKit) + 381  [0x7fff955f216c]
    +                     9732 mach_msg  (in libsystem_kernel.dylib) + 55  [0x7fff96f8d64f]
    +                       9732 mach_msg_trap  (in libsystem_kernel.dylib) + 10  [0x7fff96f8e4de]

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