Bug ID 1854137: Verified accept and pool reselect-tries may cause TCP proxy to core

Last Modified: Apr 01, 2025

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

Known Affected Versions:
16.0.0, 16.0.0.1, 16.0.1, 16.0.1.1, 16.0.1.2, 16.1.0, 16.1.1, 16.1.2, 16.1.2.1, 16.1.2.2, 16.1.3, 16.1.3.1, 16.1.3.2, 16.1.3.3, 16.1.3.4, 16.1.3.5, 16.1.4, 16.1.4.1, 16.1.4.2, 16.1.4.3, 16.1.5, 16.1.5.1, 16.1.5.2, 17.0.0, 17.0.0.1, 17.0.0.2, 17.1.0, 17.1.0.1, 17.1.0.2, 17.1.0.3, 17.1.1, 17.1.1.1, 17.1.1.2, 17.1.1.3, 17.1.1.4, 17.1.2, 17.1.2.1, 17.5.0

Opened: Mar 12, 2025

Severity: 2-Critical

Symptoms

Tmm crashes and restarts

Impact

Traffic disrupted while tmm restarts.

Conditions

-- TCP Virtual server with verified-accept enabled -- Some form of asynchronous persistance -- Flaky pool members at precisely the right time in the verified accept sequence. -- Delayed ACK on serverside, thus allowing the pool member to be taken down and the sweeper to expire the server-side flow.

Workaround

None

Fix Information

None

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips