Last Modified: Sep 13, 2023
Affected Product(s):
BIG-IP All
Known Affected Versions:
11.5.1, 11.5.2
Fixed In:
11.5.3
Opened: Dec 01, 2014 Severity: 2-Critical Related Article:
K16206
TMM cores with 'sack scoreboard population counts valid' assert. The TMM core occurs due to lost-packet retransmitted packet value mismatch.
Traffic disrupted while tmm restarts.
This occurs when processing retransmitted packets configured for selective acknowledgement (SACK), when multipath TCP (MPTCP) and selective negative acknowledgement (SNACK) are enabled with a SNACK-supporting client.
There are two possible workarounds: -- Disable MPTCP. -- Disable the SNACK option in the TCP profile.
TMM handles the case, and no longer cores due to lost-packet retransmitted packet value mismatch.