Last Modified: Nov 22, 2021
Known Affected Versions:
11.5.0, 11.4.0 HF3, 11.3.0 HF8
Opened: Jul 13, 2013 Severity: 2-Critical
A SIGABRT was occured likely due to somewhat low-memory conditions - the core stack trace is in umem allocator with all threads showing HSB attempting to allocate xfrags.
This may occur while the system is under DoS attack and unable to mitigate the attack. You may find that when enabling URL rate limiting, BIG-IP effectively denies access to a significant number of legitimate users, so use of this feature is limited under this attack.
enable ASM DoSL7.
This issue has no workaround at this time.
We fixed a memory leak that sometimes occurred during a DoS attack.