Last Modified: Aug 19, 2026
Affected Product(s):
BIG-IP LTM
Known Affected Versions:
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, 13.0.0, 13.0.0 hf1, 13.0.0 hf2, 13.0.0 hf3, 13.0.1
Fixed In:
14.0.0, 13.1.0, 12.1.3.4
Opened: Aug 14, 2017 Severity: 2-Critical
After the BIG-IP system experiences severe memory pressure, the 'allocated' and 'max_allocated' counters from the tmm/umem_usage_stat table incorrectly show extremely high values.
The 'allocated' and 'max_allocated' counters from the tmm/umem_usage_stat table do not reflect actual values. However, there is no functionality issue as a result. This is a cosmetic issue only.
The BIG-IP system experiences enough memory pressure that slabs are transferred between threads.
None.
The system now manages better under memory pressure so that the tmm/umem_usage_stat counters correctly reflect actual values.