Bug#816621: ioremap error on /sys/firmware/dmi/entries/*/raw is triggered by mcelog
A closer look at the events around t=9s (when the page cache mode is switched
to WB) pointed to mcelog as a suspect. Indeed the problem went away after
purging the mcelog package. With mcelog (104-1) installed I was getting the
following message in the logs:
mcelog: failed to prefill DIMM database from DMI data
I still think there is a kernel issue here: mcelog shouldn't be able to
request the wrong page cache mode and spoil things for everyone else.
(Or is it dmi_remap() that's asking for the wrong mode? I'm not quite sure:
if DMI data are non-volatile and read-only (are they always?) why shouldn't
they be cached?)
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