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Syslog message: MQSS.*BCMF CBUF.*Parity error corrected for buffer free list memory for bank

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Article ID: KB32090 KB Last Updated: 12 Oct 2021Version: 2.0
Summary:

The "Parity error corrected for buffer free list memory for bank" message reports a transient hardware error which was automatically corrected.

This is a Troubleshooting Article for a PFE ASIC Syslog Event.
To view other documented syslog events related to XMCHIP, XLCHIP, MQCHIP, LUCHIP, EACHIP, and PECHIP, see KB31893 - Index of Articles for Troubleshooting PFE ASIC Syslog Events.

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Symptoms:

When a "Parity error corrected for buffer free list memory for bank" event occurs, messages similar to the following is reported:

Oct 10 14:50:12 router-0 fpc1 MQSS(1): BCMF CBUF: SRAM ECC Protect: Multiple Errors 0x8000
Oct 10 14:50:12 router-0 fpc1 MQSS(1):MQSS(1): BCMF CBUF: SRAM ECC Protect: Parity error corrected for buffer free list memory for bank 7

Indications:

  • Single occurrence of the syslog message and is not seen with other events indicate a one time transient hardware error with no operational impact

  • Multiple continuous occurrences indicate persistent underlying issues

  • Minor Alarm will be raised

 

Cause:

This is due to a transient hardware SRAM error with EACHIP.

Solution:

Perform these steps to determine the cause and resolve the problem (if any).  Continue through each step until the problem is resolved.

  1. Collect the show command output.

    Capture the output to a file (in case you have to open a technical support case). To do this, configure each SSH client/terminal emulator to log your session.

    show log messages
    show log chassisd
    start shell network pfe <fpc#>
    show nvram
    show syslog messages
    exit

  2. Analyze the show command output.

    In the 'show log messages', review the events that occurred at or just before the appearance of the "Parity error corrected for buffer free list memory for bank" message. Frequently these events help identify the cause.

  • No RMA is required
  • With a single occurrence, the alarm can be cleared using the following command:

    • clear chassis fpc errors fpc-slot <x> all

    • ‚ÄčNote: This command is available in Junos OS 16.1R4-S2, 16.1R5, 16.2R2, 17.1R2, and 17.2R1 or higher.

  • Contact your technical support representative if this issue is seen repeatedly after FPC restart and consult for further steps.

This article is indexed in KB31893 - Primary Index of Articles for Troubleshooting PFE ASIC Syslog Events; tag EACHIPTSG


Tip: When looking at an event in the logs, it is important to focus on the first error message in a collection of syslog messages. The first error message is usually the cause of all the follow-on error messages. The follow-on collateral damage error messages can be ignored.

 
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