In reply to comment #2, we're using ksplice to patch the kernel, but we
haven't upgraded the ubuntu package, lately.
I'm afraid but this is a production node and I can't use it for testing.
In case it helps, this node hadn't had this issue before (62 days
running) and after yesterday's reboot, it
apport-collect with edited hostname
** Attachment removed: "WifiSyslog.txt"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1662573/+attachment/4815234/+files/WifiSyslog.txt
** Attachment added: "WifiSyslog.txt"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1662573/+attachment
apport information
** Tags added: apport-collected trusty uec-images
** Description changed:
bcache (bcache0 in this sample) ioutil goes to 100% and avgqu-sz also
gets affected. Bcache slaves don't get affected, but does affect storage
performance.
See excerpt (bcache0):
http://past
Did this issue start happening after an update/upgrade? Was there a
prior kernel version where you were not having this particular problem?
Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v4.10 kernel[
