runtime: better debug output for inconsistent Note Update issue 5139. Double wakeup on Note was reported several times, but no reliable reproducer. There also was a strange report about weird value of epoll fd. Maybe it's corruption of global data...
runtime: better debug output for inconsistent Note
Update issue 5139.
Double wakeup on Note was reported several times,
but no reliable reproducer.
There also was a strange report about weird value of epoll fd.
Maybe it's corruption of global data...

R=golang-dev, bradfitz
CC=golang-dev
https://codereview.appspot.com/12182043

h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang