Ubuntu

EDAC_DRIVER is not set in syslog, but EDAC is working - is this a bug?

Asked by dman777 on 2018-10-17

Bionic LTS server

I have a Ryzen processor and AsRock motherboard, both run ECC with no issues.

The problem I am having is in `syslog` I see `Not enabling Memory Error Detection and Correction since EDAC_DRIVER is not set`:

root@localhost:localhost:/home/one# dmesg | grep edac
out device to module amd64_edac controller F17h: DEV 0000:00:18.3 (INTERRUPT)
Giving out device to module amd64_edac controller EDAC PCI controller: DEV 0000:00:18.0 (POLLED)
/>/home/one# cat /var/log/syslog | grep -i edac
systemd-modules-load[502]: Module 'edac_core' is builtin
systemd[1]: Starting LSB: Initialize EDAC...
* Not enabling Memory Error Detection and Correction since EDAC_DRIVER is not set
...done.
* Loading DIMM labels for Memory Error Detection and Correction edac
0.156551] EDAC MC: Ver: 3.0.0
4.858684] EDAC amd64: Node 0: DRAM ECC enabled.
4.858685] EDAC amd64: F17h detected (node 0).
4.858719] EDAC MC: UMC0 chip selects:
4.858720] EDAC amd64: MC: 0: 0MB 1: 0MB
4.858720] EDAC amd64: MC: 2: 0MB 3: 0MB
4.858721] EDAC amd64: MC: 4: 0MB 5: 0MB
4.858721] EDAC amd64: MC: 6: 0MB 7: 0MB
4.858723] EDAC MC: UMC1 chip selects:
4.858723] EDAC amd64: MC: 0: 0MB 1: 0MB
4.858724] EDAC amd64: MC: 2: 16383MB 3: 16383MB
4.858725] EDAC amd64: MC: 4: 0MB 5: 0MB
4.858725] EDAC amd64: MC: 6: 0MB 7: 0MB
4.858725] EDAC amd64: using x8 syndromes.
4.858726] EDAC amd64: MCT channel count: 1
4.858773] EDAC MC0: Giving out device to module amd64_edac controller F17h: DEV 0000:00:18.3 (INTERRUPT)
4.858781] EDAC PCI0: Giving out device to module amd64_edac controller EDAC PCI controller: DEV 0000:00:18.0 (POLLED)
4.858781] AMD64 EDAC driver v3.5.0
...done.
systemd[1]: Started LSB: Initialize EDAC.

In /etc/modules I placed `edac_core`. I also see ECC is enabled in the kernel:

    root@localhost:/home/one# cat /usr/src/linux-headers-4.15.0-29-generic/.config | grep -i edac
    CONFIG_EDAC_ATOMIC_SCRUB=y
    CONFIG_EDAC_SUPPORT=y
    CONFIG_EDAC=y
    # CONFIG_EDAC_LEGACY_SYSFS is not set
    # CONFIG_EDAC_DEBUG is not set
    CONFIG_EDAC_DECODE_MCE=m
    CONFIG_EDAC_GHES=y
    CONFIG_EDAC_AMD64=m
    # CONFIG_EDAC_AMD64_ERROR_INJECTION is not set
    CONFIG_EDAC_E752X=m
    CONFIG_EDAC_I82975X=m
    CONFIG_EDAC_I3000=m
    CONFIG_EDAC_I3200=m
    CONFIG_EDAC_IE31200=m
    CONFIG_EDAC_X38=m
    CONFIG_EDAC_I5400=m
    CONFIG_EDAC_I7CORE=m
    CONFIG_EDAC_I5000=m
    CONFIG_EDAC_I5100=m
    CONFIG_EDAC_I7300=m
    CONFIG_EDAC_SBRIDGE=m
    CONFIG_EDAC_SKX=m
    CONFIG_EDAC_PND2=m
    root@localhost:/home/one# cat /usr/src/linux-headers-4.15.0-29-generic/.config | grep -i ecc
    CONFIG_HAVE_ARCH_SECCOMP_FILTER=y
    CONFIG_SECCOMP_FILTER=y
    CONFIG_SECCOMP=y
    CONFIG_MTD_NAND_ECC=m
    # CONFIG_MTD_NAND_ECC_SMC is not set
    CONFIG_MTD_NAND_ECC_BCH=y
    CONFIG_AMD_XGBE_HAVE_ECC=y
    CONFIG_MTD_SPINAND_ONDIEECC=y

Output from edac-utils

    root@localhost:/home/one# edac-util -v
    mc0: 0 Uncorrected Errors with no DIMM info
    mc0: 0 Corrected Errors with no DIMM info
    edac-util: No errors to report.

What is causing `Not enabling Memory Error Detection and Correction since EDAC_DRIVER is not set` and how do I fix that? Or is this a bug in Bionic?