Bug ID 437905: HTTP compression for certain image files may fail on the BIG-IP 2000s/2200s and 4000s/4200v platforms.

Last Modified: Mar 21, 2019

Bug Tracker

Affected Product:  See more info
BIG-IP LTM(all modules)

Known Affected Versions:
10.2.1, 11.2.1, 11.3.0, 11.4.0, 11.4.1, 11.5.0, 11.5.1, 11.5.1 HF1, 11.5.1 HF10, 11.5.1 HF11, 11.5.1 HF2, 11.5.1 HF3, 11.5.1 HF4, 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, 12.0.0, 12.0.0 HF1, 12.0.0 HF2, 12.0.0 HF3, 12.0.0 HF4, 12.1.0, 12.1.0 HF1, 12.1.0 HF2, 12.1.1, 12.1.1 HF1, 12.1.1 HF2, 12.1.2, 12.1.2 HF1, 12.1.2 HF2, 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, 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, 13.1.1.1, 13.1.1.2, 13.1.1.3, 13.1.1.4

Fixed In:
11.5.1 HF5, 11.5.0 HF4, 11.4.1 HF6

Opened: Nov 14, 2013
Severity: 3-Major
Related AskF5 Article:
K15034

Symptoms

HTTP compression for certain image files may fail on the BIG-IP 2000s/2200s and 4000s/4200v platforms. As a result of this issue, you may encounter one or more of the following symptoms: - BIG-IP iHealth lists Heuristic H450131 on the Diagnostics : Identified : Low|Medium screen. - The BIG-IP system resets the client connection. - You observe error messages in the following files with the same time stamp: /var/log/ltm :: -- crit tmm[19290]: 01010025:2: Device error: (null) Cave Creek compression error, err = -11. -- crit tmm[19290]: 01010025:2: Device error: (null) qa_dc_ctx_done: hw_comp Error. /var/log/tmm :: -- notice dcCompression_ProcessCallback() - : Recoverable error: stateful compression overflow. You may need to increase the size of your destination buffer and resubmit this request.

Impact

The client browser receives an incomplete image file and experiences a connection reset.

Conditions

HTTP compression may fail on some BIG-IP 2000s/2200s and 4000s/4200v platforms. This issue occurs when all of the following conditions are met: The BIG-IP system is configured to use hardware HTTP compression. Note: This behavior is by default for BIG-IP platforms equipped with hardware compression. You can modify this behavior using the compression.strategy database variable. However, F5 recommends that you keep this database variable set to its default value because changing it may impact system resources. For more information, refer to the Profiles for Managing HTTP Traffic chapter in the BIG-IP Local Traffic Manager: Concepts guide. The BIG-IP system is compressing a Portable Network Graphic (PNG) image file.

Workaround

To work around this issue, you must obtain an engineering hotfix for this issue and install it on the affected BIG-IP system. The engineering hotfix introduces a new quickassist.compression.buffsize_multiplier database variable that you must configure its value to 300. To obtain an engineering hotfix for this issue, contact F5 Support. To modify the quickassist.compression.buffsize_multiplier database variable, perform the following procedure: Impact of workaround: Performing the following procedure should not have a negative impact on your system. 1. Log in to the Traffic Management Shell (tmsh) by typing the following command: tmsh. 2. Modify the value of the quickassist.compression.buffsize_multiplier database variable to 300 by typing the following command: modify /sys db quickassist.compression.buffsize_multiplier value 300. 3. Save the change by typing the following command: save /sys config.

Fix Information

HTTP compression for certain image files now completes as expected on the BIG-IP 2000s/2200s and 4000s/4200v platforms

Behavior Change