Bug ID 528715: rare tmm crash when ipother irule parks

Last Modified: Apr 10, 2019

Bug Tracker

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

Known Affected Versions:
11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3, 11.6.0 HF4, 11.6.0 HF5

Fixed In:
12.0.0, 11.6.0 HF6

Opened: Jun 18, 2015
Severity: 2-Critical

Symptoms

TMM System may crash under rare condition for traffic that goes through IPOther virtual with an iRule script that parks the data flow. This occurs rarely, and it will only happen if a data flow that goes through IPOther VIP is aborted when an iRule is parked on the same flow. When the iRUle resumes, the IPOther VIP forward the original packet and tmm may crash when PEM uses the freed data of the flow that is already freed.

Impact

Traffic disrupted while tmm restarts.

Conditions

With PEM licensed/enalbed, associate an iRule script with iRule command that will park (e.g., the table command) against the IPOther virtual. At last, the data traffic that goes through PEM IPOther virtual get aborted.

Workaround

A possible workaround is not to use iRule command that will park in the iRule script that is attached to IPOther virtual. For example, there are information that could be retrieved by PEM::session command instead of using table command. If iRule command that will cause parking must be used, then this fix along with the fix of bug 484278.

Fix Information

The crash has been fixed and the should no longer be observed.

Behavior Change