![]() It does look like an arbitration issue because of too many requests for accelerators, so presumably any case of lots of accelerator requests may trigger this. *10 IOGraphicsAccelerator2::newUserClient(task*, void*, unsigned int, IOUserClient**) + 461 (IOAcceleratorFamily2 + 146995) *10 IOService::newUserClient(task*, void*, unsigned int, OSDictionary*, IOUserClient**) + 49 (kernel + 6889537) In my case, lots of Safari windows seemed to be the problem because killing Safari made things Ok, but re-starting Safari made the hangs start again,įWIW I have spin dump files from some of the hangs, and the bottom of the WindowServer stack in each case says:
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