Answering first to note 5, yes.
All the times that kernel 4.4.0-83 crashed, the problem goes away if I boot my
previous kernel 4.4.0-81.
kernel 4.4.0-83.106 does not crash during all the boots. Only some
times. I could not figure out if they are related to cold/hot boots (in
the morning always suceeds, thank goodness), CPU temperature, or any
other factor.
Answering to note 4, regarding the 4.12.0-041200.201707022031 kernel it
appears to solve the problem, but I can't be 100% sure.
Using the grub Advanced Ubuntu options, I performed 12 reboots, 6 reboots of
each kernel 4.4.0-83.106
and 4.12.0-041200.201707022031 interleaved (boot 4.4.0-83.106, then reboot
4.12.0-041200, then reboot 4.4.0-83.106, etc...)
Kernel 4.4.0-83.106 crashed on boot (with the same error) 3 out of 6
times.
Kernel 4.12.0-041200 crashed 0 (zero) out of 6 times.
Not all reboots took a 5 second power-off interval. (The ones that kernel
4.4.0-83 crashed, did wait a few seconds before booting again).
So, the fix looks promising.
Meanwhile, I go back to kernel 4.4.0-83 or 4.4.0-81 because I need virtualbox
(but I leave 4.12.0-041200 installed for now).
For my own record, the procedure I followed to install the 4.12.0-041200 was:
wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.12/linux-
headers-4.12.0-041200_4.12.0-041200.201707022031_all.deb
wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.12/linux-
headers-4.12.0-041200-generic_4.12.0-041200.201707022031_amd64.deb
wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.12/linux-
image-4.12.0-041200-generic_4.12.0-041200.201707022031_amd64.deb
sha1sum *.deb # sums looked ok
# as root (su -) from now on
dpkg -i *.deb
# ...
# ERROR (dkms apport): kernel package linux-headers-4.12.0-041200-generic
is not supported (twice)
# ...
# lots of W: Possible missing firmware /lib/firmware/nvidia/...
But it did boot fine afterwards. (I did not attempt to remove or run
virtualbox).
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https://bugs.launchpad.net/bugs/1703091
Title:
Kernel panic - not syncing: Fatal exception in interrupt
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