Last Modified: Aug 19, 2026
Affected Product(s):
BIG-IP TMOS
Known Affected Versions:
11.5.1, 11.5.1 hf1, 11.5.1 hf2, 11.5.1 hf3, 11.5.1 hf4, 11.5.1 hf5, 11.5.1 hf6, 11.5.1 hf7, 11.5.1 hf8, 11.5.1 hf9, 11.5.1 hf10, 11.5.1 hf11, 11.5.2, 11.5.2 hf1, 11.5.3, 11.5.3 hf1, 11.5.3 hf2, 11.5.4, 11.5.4 hf1, 11.5.4 hf2, 11.5.4 hf3, 11.5.4 hf4, 11.5.5, 11.5.6, 11.5.7, 11.5.8, 11.5.9, 11.5.10, 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, 11.6.5, 11.6.5.1, 11.6.5.2, 11.6.5.3, 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
Fixed In:
12.1.2
Opened: Jul 18, 2016 Severity: 2-Critical Related Article:
K85083701
-- The istatsd process produces a core file in the /shared/core directory.
iStatsd process will restart due to resource exhaustion.
This issue occurs when the following condition is met: The istatsd process attempts to read a corrupt iStats segment file with duplicate FIDs. Under these conditions, the istatsd process continually consumes memory which produces a core causing the istatsd process to restart.
To work around this issue, you can remove the iStats files and restart the istatsd processes. To do so, perform the following procedure: Impact of workaround: This workaround will cause all statistics in the iStats files to reset. 1. Log in to the BIG-IP command line. 2. To stop the istatsd and related processes, type the following command: tmsh stop sys service istatsd avrd merged. 3. To delete the iStats files, type the following command: find /var/tmstat2/ -depth -type f -delete. 4. To start the istatsd and related processes, type the following command: tmsh start sys service istatsd avrd merged.
Added a fix to protect against a continually reading a segment file that is corrupted and has Duplicate Fids.