BugZero | F5 BugID 720219 - HSL::log command can fail to pick new pool member ...

F5 - Defect ID: 720219

HSL::log command can fail to pick new pool member if last picked member is 'checking'

F5 - Defect ID: 720219

HSL::log command can fail to pick new pool member if last picked member is 'checking'

Last updated on December 31st, 2025

BugZero Risk Score
6.7 Medium

Overall: 6.7

Severity: 7.3

Community: 4.2

Lifecycle: 7.0

What is the BugZero Risk Score?

F5 Integration

Learn more about where this data comes from

F5 Integration

Learn more

Bug Scrub Advisor

Streamline upgrades with automated vendor bug scrubs

Bug Scrub Advisor

Learn more

BugZero Enterprise

Wish you caught this bug sooner? Get proactive today.

BugZero Enterprise

Learn more

Bug Details

Priority: 3-Major
Status: Verified
Impact Category: Local Traffic Manager
Views: 1

Description

Symptoms

This occurs in certain configurations where the HSL::log command is using a remote high speed log (HSL) pool with failing pool members. If a pool member goes into a 'checking' state and the command attempts to send the log via that pool member, it can fail to send and all future log commands from that iRule will also fail, if that pool member is actually unavailable.

Impact

Failure to send log messages via HSL.

Conditions

-- Using HSL::log command. -- iRule with a remote high speed logging configured.

Workaround

Follow this procedure: 1. Change the 'distribution' method of the remote high speed config to something else. 2. Save the configuration. 3. Change the method back.

Fix Information

This issue no longer occurs. If a 'down' pool member is picked, it will eventually be bypassed to find an 'up' pool member, if possible.

Change history

2025-04-28 Added: 12.1.3, 12.1.3.1, 12.1.3.2, 12.1.3.3, 12.1.3.4, 12.1.3.5, 12.1.3.6, 12.1.3.7, 12.1.4, 12.1.4.1, 13.0.0, 13.0.0 HF1, 13.0.0 HF2, 13.0.0 HF3, 13.0.1, 13.1.0, 13.1.0.1, 13.1.0.2, 13.1.0.3, 13.1.0.4, 13.1.0.5, 13.1.0.6, 13.1.0.7, 13.1.0.8, 13.1.1, 13.1.1.2, 13.1.1.3, 13.1.1.4, 13.1.1.5

Links

Original Vendor Announcement

Relevant Products

Click on a version to see all relevant bugs

Affected versions:12.1.3, 12.1.3.1, 12.1.3.2, 12.1.3.3, 12.1.3.4, 12.1.3.5, 12.1.3.6, 12.1.3.7, 12.1.4, 12.1.4.1, 13.0.0, 13.0.0 HF1, 13.0.0 HF2, 13.0.0 HF3, 13.0.1, 13.1.0, 13.1.0.1, 13.1.0.2, 13.1.0.3, 13.1.0.4, 13.1.0.5, 13.1.0.6, 13.1.0.7, 13.1.0.8, 13.1.1, 13.1.1.2, 13.1.1.3, 13.1.1.4, 13.1.1.5

Fixed versions: 15.0.0, 14.1.0.2, 14.0.1.1, 13.1.3, 12.1.5

Relevant Products

Click on a version to see all relevant bugs

Fixed versions: 15.0.0, 14.1.0.2, 14.0.1.1, 13.1.3, 12.1.5

Top F5 Defects

9.6Defect ID: 2141205
Tpm-status returns: "System Integrity: Invalid" for some Engineering Hotfixes
9.6Defect ID: 546260
TMM can crash if using the v6rd profile
9.6Defect ID: 1496269
VCMP guest on version 16.1.4 or above might experience constant TMM crashes.
9.6Defect ID: 740969
Menu visibility issue with newly activated license.
9.4Defect ID: 1785385
Intermittent traffic failures when tenant is running BIG-IP v17.1.2 or above and host is on version prior to F5OS-A 1.8.0 or F5OS-C 1.8.0

Ready to prevent the next vendor outage?

Get a demo

F5 - Defect ID: 720219

HSL::log command can fail to pick new pool member if last picked member is 'checking'

F5 - Defect ID: 720219

HSL::log command can fail to pick new pool member if last picked member is 'checking'

Last updated on December 31st, 2025

BugZero Risk Score6.7 Medium

Bug Details

Symptoms

Impact

Conditions

Workaround

Fix Information

Links

Top F5 Defects

Ready to prevent the next vendor outage?

BugZero Risk Score
6.7 Medium