10A394, MacBook Air: kernel_task runs away with the CPU

Originator:ianmeyer
Number:rdar://7013742 Date Originated:
Status:Open Resolved:
Product:OS X Product Version:10A394
Classification: Reproducible:Sometimes
 
27-Jun-2009 04:50 PM Ian Meyer:
Summary: 
Sometimes, kernel_task will take up all available CPU cycles, and cause the computer to warm up and fans to run more, on a first-generation MacBook Air w/SSD.

Steps to Reproduce:
I have been unable to isolate any specific cause. I have encountered this while running on wireless and using the USB-Ethernet adapter. I've also had it happen while plugged in to power and on battery.

Expected Results:
I don't expect this to happen.

Actual Results:
kernel_task runs off with my cpu and the computer gets hot

Regression:
This has been happening for several months, under several revisions of 10.5, including 10.5.7. I wiped 10.5.7 today and installed the WWDC release, then updated to 10A394.

Notes:
From my research online, it appears this is a common issue, without a known or acknowledged resolution.


'stackshot-syms.log' was successfully uploaded

29-Jun-2009 11:24 AM Ian Meyer:
It's happening again, with Airport off and the USB Ethernet adapter connected. The entire system is really laggy. I'm attaching another stackshot log.


'stackshot-syms.log' was successfully uploaded

Comments

The second stackshot-syms.log I attached this morning...

...is available at http://frj.li/i/stackshot-syms.log

By ianmeyer at 2009-06-29 16:03:08.669296 (reply...)

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