I am seeing this problem still occuring in kernel 4.13.0-26-generic:

EDAC MC0: Giving out device to module sb_edac.c controller Haswell 
SrcID#1_Ha#0: DEV 0000:ff:12.0 (INTERRUPT)
EDAC MC1: Giving out device to module sb_edac.c controller Haswell 
SrcID#0_Ha#0: DEV 0000:7f:12.0 (INTERRUPT)
EDAC sbridge: Some needed devices are missing
EDAC MC: Removed device 0 for sb_edac.c Haswell SrcID#1_Ha#0: DEV 0000:ff:12.0
Removed device 1 for sb_edac.c Haswell SrcID#0_Ha#0: DEV 0000:7f:12.0
EDAC sbridge: Couldn't find mci handler
EDAC sbridge: Couldn't find mci handler
EDAC sbridge: Failed to register device with error -19.

We can't apply actual HWE Kernel for Ubuntu 16.04 Server, since this bug
breaks our bridge networking for KVM, because of:

  * vhost guest network randomly drops under stress (kvm) (LP: #1711251)
    - Revert "vhost: cache used event for better performance"

Will there be a Fix for HWE Kernels?

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https://bugs.launchpad.net/bugs/1714112

Title:
  EDAC sbridge: Failed to register device with error -22.

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