sched: Fix affine_move_task() self-concurrency
Consider: sched_setaffinity(p, X); sched_setaffinity(p, Y); Then the first will install p->migration_pending = &my_pending; and issue stop_one_cpu_nowait(pending); and the second one will read p->migration_pending and _also_ issue: stop_one_cpu_nowait(pending), the _SAME_ @pending. This causes stopper list corruption. Add set_affinity_pending::stop_pending, to indicate if a stopper is in progress. Fixes: 6d337eab ("sched: Fix migrate_disable() vs set_cpus_allowed_ptr()") Cc: stable@kernel.org Signed-off-by:Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by:
Ingo Molnar <mingo@kernel.org> Reviewed-by:
Valentin Schneider <valentin.schneider@arm.com> Link: https://lkml.kernel.org/r/20210224131355.649146419@infradead.org
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3f1bc119
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