Rtl8169 has enabled runtime pm, so the bug is very probably caused
by runtime pm operation after shutdown, see some discussions below link:
http://marc.info/?l=linux-pm&m=132123391726374&w=2
If possible, please apply the patch to see if it can fix your issue.
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https://bugs.launchpad.net/bugs/779040
Title:
System hangs (solid) early during shutdown
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