The kernel-rt got hung up with lots of tasks being stuck in D state. A real-time task caused other non-real time task to be starved for runtime.
Issue
- The kernel-rt got hung up.
- The customer injected NMI to crash the kernel-rt to capture a vmcore file.
Environment
- Red Hat OpenShift Container Platform 4.12
- Red Hat Enterprise Linux Realtime CoreOS - kernel-rt-4.18.0-372.32.1.rt7.189.el8_6
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