Bug ID 787821: httprouter may deadlock

Last Modified: Sep 13, 2023

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

Known Affected Versions:
15.0.1

Fixed In:
15.1.0, 15.0.1.1

Opened: May 29, 2019

Severity: 3-Major

Symptoms

The httprouter proxy may get into a state where it closes the TCP window, and never reopens it.

Impact

Traffic on a HTTP2 stream, or HTTP 1 connection blocks. Eventually, the connection will be killed by the sweeper.

Conditions

The HTTP MRF Router is used. This configuration is typically used with the HTTP2 Full Proxy when you use the httprouter profile. A very large amount of data arrives from the server in a short amount of time after connection setup.

Workaround

None

Fix Information

The HTTP MRF Router will not get into a state where the TCP window is permanently closed.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips