"SER Parity Check Error"

[WGL_BK]

I'm having a bad week - my ISR 4331 router has been flooding my syslog server with these messages non-stop and I can't seem to find why:

Sep 29 15:38:54.415: %IOSXE-3-PLATFORM: R0/0: bcm_switch: unit 0 SER_ERROR_0 REG unexpected NACK failure!
Sep 29 15:38:54.415: %IOSXE-3-PLATFORM: R0/0: bcm_switch: SER Parity Check Error.
Sep 29 15:38:54.415: %IOSXE-3-PLATFORM: R0/0: bcm_switch: SchanTimeOut:soc_schan_op operation timed out
Sep 29 15:38:54.416: %IOSXE-3-PLATFORM: R0/0: bcm_switch: unit 0 SER_ERROR_0 REG SCHAN NACK analysis.
Sep 29 15:38:54.416: %IOSXE-3-PLATFORM: R0/0: bcm_switch: unit 0 SER_ERROR_0 REG unexpected NACK failure!
Sep 29 15:38:54.416: %IOSXE-3-PLATFORM: R0/0: bcm_switch: SER Parity Check Error.
Sep 29 15:38:54.417: %IOSXE-3-PLATFORM: R0/0: bcm_switch: SchanTimeOut:soc_schan_op operation timed out
Sep 29 15:38:54.418: %IOSXE-3-PLATFORM: R0/0: bcm_switch: unit 0 SER_ERROR_0 REG SCHAN NACK analysis.
Sep 29 15:38:54.418: %IOSXE-3-PLATFORM: R0/0: bcm_switch: unit 0 SER_ERROR_0 REG unexpected NACK failure!
Sep 29 15:38:54.418: %IOSXE-3-PLATFORM: R0/0: bcm_switch: SER Parity Check Error.
Sep 29 15:38:54.418: %IOSXE-3-PLATFORM: R0/0: bcm_switch: SchanTimeOut:soc_schan_op operation timed out
Sep 29 15:38:54.420: %IOSXE-3-PLATFORM: R0/0: bcm_switch: unit 0 SER_ERROR_0 REG SCHAN NACK analysis.
Sep 29 15:38:54.420: %IOSXE-3-PLATFORM: R0/0: bcm_switch: unit 0 SER_ERROR_0 REG unexpected NACK failure!
Sep 29 15:38:54.420: %IOSXE-3-PLATFORM: R0/0: bcm_switch: SER Parity Check Error.
Sep 29 15:38:54.420: %IOSXE-3-PLATFORM: R0/0: bcm_switch: SchanTimeOut:soc_schan_op operation timed out
Sep 29 15:38:54.421: %IOSXE-3-PLATFORM: R0/0: bcm_switch: unit 0 SER_ERROR_0 REG SCHAN NACK analysis.
Sep 29 15:38:54.421: %IOSXE-3-PLATFORM: R0/0: bcm_switch: unit 0 SER_ERROR_0 REG unexpected NACK failure!
Sep 29 15:38:54.422: %IOSXE-3-PLATFORM: R0/0: bcm_switch: SER Parity Check Error.

The IOS version: 

Cisco IOS XE Software, Version 16.09.04
Cisco IOS Software [Fuji], ISR Software (X86_64_LINUX_IOSD-UNIVERSALK9-M), Version 16.9.4, RELEASE SOFTWARE (fc2)

I've found this Parity Errors Troubleshooting Guide but I'm not seeing my exact error, I'm a little way about messing around in an area I'm unsure of. Hoping someone can point me in the right direction.

[Mark Elsen · Accepted solution]

 - Looks like a hardware error , single parity errors usually don't affect operation. If the device is currently mission critical no further action may be taken/needed. Otherwise you might contemplate cold-reboot (with power cycle) , check if problem remains in place or not.

 M.

[WGL_BK]

Thanks, I'll try to reboot overnight and see.

[WGL_BK]

You were right, after the reboot I've seen no further errors. Thank you very much.

[Rich R]

Just to add to this (as we've just seen the problem and a reboot cleared it)- this seems to be addressed by https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvv98528 which is fixed in later IOS-XE releases.