Bug#869886: Problem goes away when downgrading to Jessie 3.16 kernel

[Mike Crowe <mac@mcrowe.com>]

Previously, I wrote:
> A few days after upgrading to Stretch and its 4.9 kernel we got an RCU
> stall in the middle of the night:

A series of very-similar-looking RCU stalls happened again a week later.
The machine is under moderate load most of the time.

I switched to running Jessie's kernel, and the machine has now been
completely reliable for over a month.

# uname -a
Linux lander 3.16.0-4-amd64 #1 SMP Debian 3.16.43-2+deb8u2 (2017-06-26) x86_64 GNU/Linux

# cat /proc/cmdline
BOOT_IMAGE=/vmlinuz-3.16.0-4-amd64 root=/dev/mapper/lander1-root ro nointremap

Mike.