I observe a problem on a relatively recent, but not the latest, head.
r306752 amd64 on AMD hardware.
If I run
        pmcstat -T -P instructions -t $pid
with a pid of a busy userland process, then I shortly get a (stray) NMI.
Apparently hwpmc does not recognize that NMI.

Any suggestions, help, me-toos?
Thank you!
Andriy Gapon
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