Bug ID 1778597: Control characters in user.log from APM API logging

Last Modified: Jun 19, 2025

Affected Product(s):
BIG-IP APM(all modules)

Known Affected Versions:
15.1.0, 15.1.0.1, 15.1.0.2, 15.1.0.3, 15.1.0.4, 15.1.0.5, 15.1.1, 15.1.2, 15.1.2.1, 15.1.3, 15.1.3.1, 15.1.4, 15.1.4.1, 15.1.5, 15.1.5.1, 15.1.6, 15.1.6.1, 15.1.7, 15.1.8, 15.1.8.1, 15.1.8.2, 15.1.9, 15.1.9.1, 15.1.10, 15.1.10.2, 15.1.10.3, 15.1.10.4, 15.1.10.5, 15.1.10.6

Opened: Dec 18, 2024

Severity: 3-Major

Symptoms

Continuous log split happens between APM and user.log. Following is an example: - APM log message: Sep 4 10:47:03 vasa.catalana.local info tmm2[30739]: 01870003:6: <AP-Policy>:DMZ:4856079548879470666: Agent created variable name: perflow.subroutine_skip_agent_cb_flag, value: - /var/log/user.log: Sep 4 10:47:03 vasa.catalana.local

Impact

Log’s first line is written to the appropriate file, and the remaining lines to both /var/log/user.log and /var/log/messages

Conditions

The API protection policy should be established.

Workaround

None

Fix Information

None

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips