Bug 156750 - REGRESSION: Mac debug EWS bots freeze
Summary: REGRESSION: Mac debug EWS bots freeze
Status: RESOLVED FIXED
Alias: None
Product: WebKit
Classification: Unclassified
Component: Tools / Tests (show other bugs)
Version: Other
Hardware: Unspecified Unspecified
: P2 Normal
Assignee: Nobody
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2016-04-19 10:22 PDT by Alexey Proskuryakov
Modified: 2016-04-20 11:40 PDT (History)
5 users (show)

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Description Alexey Proskuryakov 2016-04-19 10:22:07 PDT 
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]
Comment 1 Alexey Proskuryakov 2016-04-19 10:22:56 PDT 
It is also possible that we haven't landed anything yet, and it's the patch in bug 156689 that kills EWS machines.
Comment 2 Alexey Proskuryakov 2016-04-20 11:40:52 PDT 
Looks like that was indeed it, and fixing that patch made the problem stop.

EWS++