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Issue: runc exec hangs when joining a container whose cpuset consists entirely of isolated CPUs

Issue: runc exec hangs when joining a container whose cpuset consists entirely of isolated CPUs: a task in LegoFlow-SWE (Harbor dataset). Since Linux kernel commit 46a87b3851f0d6eb05e6d83d5c5a30df0eca8f76 (v5.7+), the scheduler no longer guarantees that a process entering a cgroup cpuset lands on…

The task

Since Linux kernel commit `46a87b3851f0d6eb05e6d83d5c5a30df0eca8f76` (v5.7+), the scheduler no longer guarantees that a process entering a cgroup cpuset lands on the first CPU of that set. Instead, the kernel distributes the task randomly across the allowed CPUs.

Part of Lego-X/LegoFlow-SWE.