kernel hang in Media graphics engine infinite loop
| Originator: | valexa | ||
| Number: | rdar://10087439 | Date Originated: | 08-Sep-2011 12:03 AM |
| Status: | Open | Resolved: | |
| Product: | Mac OS X | Product Version: | 10.7.1 |
| Classification: | hang | Reproducible: |
Around 9 PM i had done some testing of a bluetooth headset consisting in recording with quicktime and outputing music to it of which i experienced choppy sound/dropped frames so i disconnected the headset. At this point iTunes was outputting significantly degraded sound even to built-in speakers while the same file played fine with quicktime and spotify, a restart of iTunes brought it back to normal, at this pint i stepped away from the machine. I returned at 11 PM to find the machine unresponsive with a black screen and cursor, fan spinning around 3-4k RPM , i was able to remotely ssh to it and kill WindowServer at 11:20:54 after which i used the hardware button to restart it. Investigation after restart showed it was caught up in a infinite loop of a kernel hang of which full logs are attached. Sep 7 23:21:01 VAir kernel[0]: timestamps = 0x0006 Sep 7 23:21:01 VAir kernel[0]: Semaphore register values: Sep 7 23:21:01 VAir kernel[0]: VRSYNC: (0x12044) = 0xdf762 Sep 7 23:21:01 VAir kernel[0]: BRSYNC: (0x22040) = 0x0 Sep 7 23:21:01 VAir kernel[0]: RVSYNC: (0x 2040) = 0x0 Sep 7 23:21:01 VAir kernel[0]: BVSYNC: (0x22044) = 0x0 Sep 7 23:21:01 VAir kernel[0]: RBSYNC: (0x 2044) = 0x0 Sep 7 23:21:01 VAir kernel[0]: VBSYNC: (0x12040) = 0x0 Sep 7 23:21:01 VAir kernel[0]: kIPEHR: 0x1000000 Sep 7 23:21:01 VAir kernel[0]: kINSTDONE: 0xfffffffe Sep 7 23:21:01 VAir kernel[0]: kINSTDONE_1: 0xffffffff Sep 7 23:21:12 VAir kernel[0]: WaitForStamp: Overflowed waiting for stamp 0x7 on Media ring: called from Sep 7 23:21:12 VAir kernel[0]: timestamp = 0x0006 Sep 7 23:21:12 VAir kernel[0]: **** Debug info for apparent hang in Media graphics engine **** Sep 7 23:21:12 VAir kernel[0]: ring head = 0x00000310, wrap count = 0x 0 Sep 7 23:21:12 VAir kernel[0]: ring tail = 0x00000380 ring control = 0x00003001 enabled, auto report disabled, not waiting, semaphore not waiting, length = 0x004 4KB pages
Comments
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Same issue here... same log entries over and over for hours.
Happened to me on 3-4 different occasions - can't think of any correlation to what I was doing (or rather not doing) at the time... sometimes while the screen was sleeping, once while the screen was still on. Don't think it ever did it while I was using it... I'd come back to it a bit later and find it "stuck"...
9/2/11 8:48:42.000 PM kernel: timestamps = 0x0002 9/2/11 8:48:42.000 PM kernel: Semaphore register values: 9/2/11 8:48:42.000 PM kernel: VRSYNC: (0x12044) = 0x44476c 9/2/11 8:48:42.000 PM kernel: BRSYNC: (0x22040) = 0x0 9/2/11 8:48:42.000 PM kernel: RVSYNC: (0x 2040) = 0x0 9/2/11 8:48:42.000 PM kernel: BVSYNC: (0x22044) = 0x0 9/2/11 8:48:42.000 PM kernel: RBSYNC: (0x 2044) = 0x0 9/2/11 8:48:42.000 PM kernel: VBSYNC: (0x12040) = 0x0 9/2/11 8:48:42.000 PM kernel: kIPEHR: 0x78171003 9/2/11 8:48:42.000 PM kernel: kINSTDONE: 0xfffffffe 9/2/11 8:48:42.000 PM kernel: kINSTDONE_1: 0xffffffff 9/2/11 8:48:52.000 PM kernel: WaitForStamp: Overflowed waiting for stamp 0x3 on Media ring: called from 9/2/11 8:48:52.000 PM kernel: timestamp = 0x0002 9/2/11 8:48:52.000 PM kernel: * Debug info for apparent hang in Media graphics engine * 9/2/11 8:48:52.000 PM kernel: ring head = 0x00000110, wrap count = 0x 0 9/2/11 8:48:52.000 PM kernel: ring tail = 0x00000180 ring control = 0x00003001 enabled, auto report disabled, not waiting, semaphore not waiting, length = 0x004 4KB pages