BugZero | Cisco BugID CSCvx63675 - Memory depletion due to Crimson Stp stats

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BugZero | Cisco BugID CSCvx63675 - Memory depletion due to Crimson Stp stats

ODD
Cisco
CSCvx63675

Cisco - Defect ID: CSCvx63675

Memory depletion due to Crimson Stp stats

ODD
Cisco
CSCvx63675

Cisco - Defect ID: CSCvx63675

Memory depletion due to Crimson Stp stats

Last updated on July 4th, 2025

BugZero Risk Score
7.8 High

Overall: 7.8

Severity: 8.2

Lifecycle: 9.1

Popularity: 5.1

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Bug Details

Views: 36

Description

Symptom

STP pushing topology change notification causing CPU load and memory depletion.

Conditions

Condition1 : Catalyst9000 platforms Condition2 : Version from 17.3.1 to 17.3.4 Condition3 : chunk error for stp is seen %SYS-4-CHUNKSIBLINGSEXCEED: Number of siblings in a chunk has gone above the threshold. Threshold:10000 Sibling-Count:10001 Chunk:0x80007FBDC4AD4F40 Name:Crimson Stp sta -Process= "Spanning Tree", ipl= 2, pid= 242 %SYS-2-CHUNKEXPANDFAIL: Could not expand chunk pool for Crimson Stp sta. %SYS-4-FREEMEMLOW: Top Allocator Name: Crimson Stp

Workaround

Avoid constant STP togology changes

Further Problem Description

Continuous tracebacks could be observed. *Mar 10 08:19:31.994: %PLATFORM_MATM-4-QUEUE_OVERLIMIT: MATM dropped learn cache batch messages as queue limit has reached. *Mar 10 08:19:32.168: %SYS-4-CHUNKSIBLINGSEXCEED: Number of siblings in a chunk has gone above the threshold. Threshold:10000 Sibling-Count:29037 Chunk:0x80007F2432928A50 Name:Crimson Stp sta -Process= "Chunk Manager", ipl= 2, pid= 1 -Traceback= 1#c79fa717ffad0d3f09336e0519d3b8c4 :55BCC5340000+AE8A83B

Change history

2025-07-04 Added: 17.6.1, Bengaluru-17.5.1

Relevant Products

Click on a version to see all relevant bugs

Affected versions:17.6.1, Bengaluru-17.5.1

Fixed versions: 17.05.01c, 17.10.1, 17.10.1a, 17.10.1b, 17.11.1, 17.11.1a, 17.12.02a, 17.12.1, 17.12.1w, 17.12.1x, 17.12.2, 17.12.2a, 17.13.1, 17.13.1a, 17.3.4, 17.3.4a, 17.3.4b, 17.3.4c, 17.3.5, 17.3.5a, 17.3.5b, 17.3.6, 17.3.7, 17.3.8, 17.3.8a, 17.5.1, 17.5.1a, 17.5.1b, 17.5.1c, 17.6.1, 17.6.1a, 17.6.1w, 17.6.1x, 17.6.1y, 17.6.1z, 17.6.1z1, 17.6.2, 17.6.3, 17.6.3a, 17.6.4, 17.6.5, 17.6.5a, 17.6.6, 17.6.6a, 17.7.1, 17.7.1a, 17.7.1b, 17.7.2, 17.8.1, 17.8.1a, 17.9.1, 17.9.1a, 17.9.1w, 17.9.1x, 17.9.1x1, 17.9.1y, 17.9.1y1, 17.9.2, 17.9.2a, 17.9.3, 17.9.3a, 17.9.4, 17.9.4a, 17.9.5, 17.9.5a, Amsterdam-17.3.4, Bengaluru-17.5.1, Bengaluru-17.6.1

Relevant Products

Click on a version to see all relevant bugs

Affected versions:17.6.1, Bengaluru-17.5.1

Fixed versions: 17.05.01c, 17.10.1, 17.10.1a, 17.10.1b, 17.11.1, 17.11.1a, 17.12.02a, 17.12.1, 17.12.1w, 17.12.1x, 17.12.2, 17.12.2a, 17.13.1, 17.13.1a, 17.3.4, 17.3.4a, 17.3.4b, 17.3.4c, 17.3.5, 17.3.5a, 17.3.5b, 17.3.6, 17.3.7, 17.3.8, 17.3.8a, 17.5.1, 17.5.1a, 17.5.1b, 17.5.1c, 17.6.1, 17.6.1a, 17.6.1w, 17.6.1x, 17.6.1y, 17.6.1z, 17.6.1z1, 17.6.2, 17.6.3, 17.6.3a, 17.6.4, 17.6.5, 17.6.5a, 17.6.6, 17.6.6a, 17.7.1, 17.7.1a, 17.7.1b, 17.7.2, 17.8.1, 17.8.1a, 17.9.1, 17.9.1a, 17.9.1w, 17.9.1x, 17.9.1x1, 17.9.1y, 17.9.1y1, 17.9.2, 17.9.2a, 17.9.3, 17.9.3a, 17.9.4, 17.9.4a, 17.9.5, 17.9.5a, Amsterdam-17.3.4, Bengaluru-17.5.1, Bengaluru-17.6.1

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