156750 2016-04-19 10:22:07 -0700 REGRESSION: Mac debug EWS bots freeze 2016-04-20 11:40:52 -0700 1 1 1 Unclassified WebKit Tools / Tests Other Unspecified Unspecified RESOLVED FIXED P2 Normal --- 1 ap webkit-unassigned dino graouts lforschler ryanhaddad simon.fraser oldest_to_newest 1185062 0 ap 2016-04-19 10:22:07 -0700 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] 1185063 1 ap 2016-04-19 10:22:56 -0700 It is also possible that we haven't landed anything yet, and it's the patch in bug 156689 that kills EWS machines. 1185484 2 ap 2016-04-20 11:40:52 -0700 Looks like that was indeed it, and fixing that patch made the problem stop. EWS++