rhel8: Kernel cannot kill a process doing compaction for hugepage allocation
Issue
- A process hung. trying to kill the process with SIGKILL would not kill the process.
- It seems like should_compaction_retry() continues to retry in spite of retry limit defined as MAX_COMPACT_RETRY(=16). It does not make sense that the kernel continues memory reclaim for the process which is going to be killed.
Environment
- Red Hat Enterprise Linux (RHEL) 8.2
- Architecture: issue seen on aarch64, but as per our understanding all architectures are affected
- Kernel Version: 4.18.0-193.13.2.el8_2
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