Real-time Scheduling Fault Simulation
summary
A practical survey of ways to inject scheduling faults into Linux shows concrete experiments with strace error injection, the kernel fault-injection framework, eBPF/BPFTrace and Kprobes; strace can force syscall failures but breaks on forks, the fault-injection fs lacks scheduler hooks, BPFTrace can override syscalls via BPFTrace kprobe override but cannot sleep and hits verifier limits, and Kprobes risk locking and recursion issues. The scheduler core (schedule/pick_next_task) is not exported so reliable early/late wake manipulations require kernel patches; work-in-progress tooling and examples exist but no production-ready injector yet.
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chapters (13)
- 0:00Real-time scheduling simulation
- 1:50Linux real-time scheduling history
- 3:13Linux real-time scheduling classes
- 7:07Disrupting real-time scheduling
- 8:54User-space fault injection
- 11:22Kernel fault injection framework
- 13:35eBPF for scheduling disruption
- 18:15Disrupting at scheduling points
- 21:13Linux scheduler deep dive
- 25:15Kernel patching challenges
- 29:31Scheduler disruption challenges
- 30:56Future work and next steps
- 33:05Q&A
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