BugZero | F5 BugID 501516 - If a very large number of monitors is configured, ...

F5 - Defect ID: 501516

If a very large number of monitors is configured, bigd can run out of file descriptors when it is restarted.

F5 - Defect ID: 501516

If a very large number of monitors is configured, bigd can run out of file descriptors when it is restarted.

Last updated on July 18th, 2026

BugZero Risk Score
6.7 Medium

Overall: 6.7

Severity: 7.3

Community: 4.2

Lifecycle: 7.0

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Bug Details

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

Description

Symptoms

When using a very large number of monitors, bigd may run out of file descriptors when it is restarted.

Impact

bigd cores and gets into a restart loop; monitors no longer work properly. The ltm log might contain error messages similar to the following: socket error: Too many open files.

Conditions

A system with a large number of monitors configured.

Workaround

Reduce the number of monitors on the system.

Fix Information

bigd no longer runs out of file descriptors during restart when using a very large number of monitors.

Change history

Links

Original Vendor Announcement

Relevant Products

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Affected versions:11.5.1, 11.5.1 hf1, 11.5.1 hf2, 11.5.1 hf3, 11.5.1 hf4, 11.5.1 hf5, 11.5.1 hf6, 11.5.1 hf7, 11.5.1 hf8, 11.5.1 hf9, 11.5.1 hf10, 11.5.1 hf11, 11.5.2, 11.5.2 hf1, 11.5.3, 11.5.3 hf1, 11.5.3 hf2, 11.5.4, 11.5.4 hf1, 11.5.4 hf2, 11.5.4 hf3, 11.5.4 hf4, 11.5.5, 11.5.6, 11.5.7, 11.5.8, 11.5.9, 11.5.10, 11.6.0, 11.6.0 hf1, 11.6.0 hf2, 11.6.0 hf3, 11.6.0 hf4, 11.6.0 hf5, 11.6.0 hf6, 11.6.0 hf7, 11.6.0 hf8, 11.6.1, 11.6.1 hf1, 11.6.1 hf2, 11.6.2, 11.6.2 hf1, 11.6.3, 11.6.3.1, 11.6.3.2, 11.6.3.3, 11.6.3.4, 11.6.4, 11.6.5, 11.6.5.1, 11.6.5.2, 11.6.5.3

Fixed versions: 12.0.0

Relevant Products

Click on a version to see all relevant bugs

Fixed versions: 12.0.0

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F5 - Defect ID: 501516

If a very large number of monitors is configured, bigd can run out of file descriptors when it is restarted.

F5 - Defect ID: 501516

If a very large number of monitors is configured, bigd can run out of file descriptors when it is restarted.

Last updated on July 18th, 2026

BugZero Risk Score6.7 Medium

Bug Details

Symptoms

Impact

Conditions

Workaround

Fix Information

Links

Top F5 Defects

Ready to prevent the next vendor outage?

F5 - Defect ID: 501516

If a very large number of monitors is configured, bigd can run out of file descriptors when it is restarted.

F5 - Defect ID: 501516

If a very large number of monitors is configured, bigd can run out of file descriptors when it is restarted.

Last updated on July 18th, 2026

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

BugZero Risk Score
6.7 Medium