BugZero | Cisco BugID CSCvx82940 - Eyrie: Coherent driver crash seen when router goin...

Cisco - Defect ID: CSCvx82940

Eyrie: Coherent driver crash seen when router going down for reload 7.4.1.24I

Cisco - Defect ID: CSCvx82940

Eyrie: Coherent driver crash seen when router going down for reload 7.4.1.24I

Last updated on February 22nd, 2026

BugZero Risk Score
6.1 Medium

Overall: 6.1

Severity: 6.4

Lifecycle: 9.1

Popularity: 4.6

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Bug Details

Description

Symptom

Coherent_driver process can crash on doing line card reload or MPA reload. This is an intermittent crash and doesn't have any impact on functionality.

Conditions

This crash will be seen on Potenza mod LC(NC55-MOD-A-S and variants) or Peyto with any MPA which has CFP2 ports and the laser is ON. Note that crash will not be seen if laser is not ON.

Workaround

This is an intermittent crash which is not seen on all reloads, it doesn't have any functionality impact. So, there is no work around required. IF any work around is required, laser can be turned off by doing shut on optics controller and then the MPA reload / LC reload can be performed.

Further Problem Description

The reproducibility is around 1/30 trials.

Change history

2025-01-24 Added: 7.4.1

Links

Original Vendor Announcement

Relevant Products

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Affected versions:7.4.1

Fixed versions: 24.1.1, 6.8.1, 6.8.2, 6.9.1, 6.9.2, 7.10.1, 7.10.2, 7.11.1, 7.11.2, 7.3.2, 7.3.25, 7.3.26, 7.3.27, 7.3.3, 7.3.4, 7.3.5, 7.3.6, 7.4.1, 7.4.15, 7.4.16, 7.4.2, 7.5.1, 7.5.12, 7.5.2, 7.5.3, 7.5.4, 7.5.5, 7.6.1, 7.6.15, 7.6.2, 7.6.3, 7.7.1, 7.7.2, 7.7.21, 7.8.1, 7.8.2, 7.8.22, 7.9.1, 7.9.2, 7.9.21

Relevant Products

Click on a version to see all relevant bugs

Affected versions:7.4.1

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Cisco - Defect ID: CSCvx82940

Eyrie: Coherent driver crash seen when router going down for reload 7.4.1.24I

Cisco - Defect ID: CSCvx82940

Eyrie: Coherent driver crash seen when router going down for reload 7.4.1.24I

Last updated on February 22nd, 2026

BugZero Risk Score6.1 Medium

Bug Details

Symptom

Conditions

Workaround

Further Problem Description

Links

Top Cisco Defects

Ready to prevent the next vendor outage?

BugZero Risk Score
6.1 Medium