Some process went UNINTERRUPTABLE forever.

[Di, Wu]

The process status of 'pdflush' went to UNINTERRUPTIBLE forever, and
then I edit some file(in other media) use 'vi', the 'vi' also went to
that status. And I cannot even reboot my system, instead I need use the
power button.
I am using Kernel-2.6.20-rc6-mm3 with 'preemptible' option.


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