From 13b5ab02ae118fc8dfdc2b8597688ec4a11d5b53 Mon Sep 17 00:00:00 2001 From: Xunlei Pang Date: Mon, 9 May 2016 12:11:31 +0800 Subject: [PATCH] sched/rt, sched/dl: Don't push if task's scheduling class was changed We got this warning: WARNING: CPU: 1 PID: 2468 at kernel/sched/core.c:1161 set_task_cpu+0x1af/0x1c0 [...] Call Trace: dump_stack+0x63/0x87 __warn+0xd1/0xf0 warn_slowpath_null+0x1d/0x20 set_task_cpu+0x1af/0x1c0 push_dl_task.part.34+0xea/0x180 push_dl_tasks+0x17/0x30 __balance_callback+0x45/0x5c __sched_setscheduler+0x906/0xb90 SyS_sched_setattr+0x150/0x190 do_syscall_64+0x62/0x110 entry_SYSCALL64_slow_path+0x25/0x25 This corresponds to: WARN_ON_ONCE(p->state == TASK_RUNNING && p->sched_class == &fair_sched_class && (p->on_rq && !task_on_rq_migrating(p))) It happens because in find_lock_later_rq(), the task whose scheduling class was changed to fair class is still pushed away as if it were a deadline task ... So, check in find_lock_later_rq() after double_lock_balance(), if the scheduling class of the deadline task was changed, break and retry. Apply the same logic to RT tasks. Signed-off-by: Xunlei Pang Reviewed-by: Steven Rostedt Acked-by: Peter Zijlstra Cc: Peter Zijlstra Cc: Steven Rostedt Cc: Juri Lelli Link: http://lkml.kernel.org/r/1462767091-1215-1-git-send-email-xlpang@redhat.com Signed-off-by: Ingo Molnar --- kernel/sched/deadline.c | 1 + kernel/sched/rt.c | 1 + 2 files changed, 2 insertions(+) diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c index affd97ec9f65..686ec8adf952 100644 --- a/kernel/sched/deadline.c +++ b/kernel/sched/deadline.c @@ -1394,6 +1394,7 @@ static struct rq *find_lock_later_rq(struct task_struct *task, struct rq *rq) !cpumask_test_cpu(later_rq->cpu, &task->cpus_allowed) || task_running(rq, task) || + !dl_task(task) || !task_on_rq_queued(task))) { double_unlock_balance(rq, later_rq); later_rq = NULL; diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c index c41ea7ac1764..ec4f538d4396 100644 --- a/kernel/sched/rt.c +++ b/kernel/sched/rt.c @@ -1729,6 +1729,7 @@ static struct rq *find_lock_lowest_rq(struct task_struct *task, struct rq *rq) !cpumask_test_cpu(lowest_rq->cpu, tsk_cpus_allowed(task)) || task_running(rq, task) || + !rt_task(task) || !task_on_rq_queued(task))) { double_unlock_balance(rq, lowest_rq); -- 2.20.1