On Thu, 19 Sep 2013, Nick Lewycky wrote:
> Henrique de Moraes Holschuh wrote:
> >I am trying to reproduce this issue with AMD, so as to try to track down
> >which kernels are affected (and if possibly, track down WHAT fixed the bug
> >as that isn't clear right now).
> >
> >Did the issue happen on a *first install* of amd64-microcode, or did it
> >happen only when you tried to upgrade the package from an older version ?
>
> It worked on first install and only broke when I tried to upgrade.
Can you check your kernel logs and tell me whether that first install caused
a processor microcode update?
Or failing that, if you could please purge the package, reboot (so that
you'll be running with BIOS microcode) and install it again (which would do
a "first microcode update"), just to make sure first installs are safe?
It may be that the problem happens when you upgrade the processor microcode
twice in a row, i.e. first installs would never cause it to happen, and the
first update done by the initramfs would also be always safe.
> >Also, if you upgraded the kernel to solve the issue, which version you're
> >using (and did it fix the issue) ?
>
> No, I haven't gotten around to upgrading my kernel yet. I'm
> convinced by your explanation that the kernel is buggy and hope to
> get to that soon (this weekend?).
Well, if you do, 3.10.x is supposed to be safe, but I'd really appreciate if
you could test it like this:
1. install the old microcode package[1], with the microcode module loaded,
and check /var/log/kern.log to verify whether a microcode update really
happened. You might need to trigger themicrocode update manually with
(for kernel 3.10):
echo -n 1 > /sys/devices/system/cpu/microcode/reload
(for kernels before 3.6):
echo -n 1 > /sys/devices/system/cpu/cpu0/microcode/reload.
2. upgrade the microcode package to the new one in testing/unstable, which
should update the microcode *again* (check in /var/log/kern.log, and if
necessary please reissue the "reload" trigger above) to be sure.
Thank you!
[1] you can get a copy of the old package here:
http://snapshot.debian.org/package/amd64-microcode/
It is version 2.20120910-1 (if you're running testing/unstable), or
version 1.20120910-2 (if you're running stable).
--
"One disk to rule them all, One disk to find them. One disk to bring
them all and in the darkness grind them. In the Land of Redmond
where the shadows lie." -- The Silicon Valley Tarot
Henrique Holschuh
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