During heavy network traffic (esp. flash video) I see the attached NULL
pointer dereference in 2.6.39-rc5 on an IBM Thinkpad x120e. Immediately
afterward a "scheduling while atomic" bug is reported and the system
becomes unresponsive. I am unable to produce this problem in 2.6.38.4.

See attached backtrace and dmesg. Please let me know what I can collect
to make this problem easier to troubleshoot.