sched: Fix crash trying to dequeue/enqueue the idle thread

Sasha reports that his virtual machine tries to schedule the idle
thread since commit 6c37067e2786 ("sched: Change the
sched_class::set_cpus_allowed() calling context").

Hit trace shows this happening from idle_thread_get()->init_idle(),
which is the _second_ init_idle() invocation on that task_struct, the
first being done through idle_init()->fork_idle(). (this code is
insane...)

Because we call init_idle() twice in a row, its ->sched_class ==
&idle_sched_class and ->on_rq = TASK_ON_RQ_QUEUED. This means
do_set_cpus_allowed() think we're queued and will call dequeue_task(),
which is implemented with BUG() for the idle class, seeing how
dequeueing the idle task is a daft thing.

Aside of the whole insanity of calling init_idle() _twice_, change the
code to call set_cpus_allowed_common() instead as this is 'obviously'
before the idle task gets ran etc..

Reported-by: Sasha Levin <sasha.levin@oracle.com>
Tested-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: 6c37067e2786 ("sched: Change the sched_class::set_cpus_allowed() calling context")
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 11 insertions, 3 deletions

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 97d276ff1edb..f0d043ec0182 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -4927,7 +4927,15 @@ void init_idle(struct task_struct *idle, int cpu)
         idle->state = TASK_RUNNING;
         idle->se.exec_start = sched_clock();
 
-        do_set_cpus_allowed(idle, cpumask_of(cpu));
+#ifdef CONFIG_SMP
+        /*
+         * Its possible that init_idle() gets called multiple times on a task,
+         * in that case do_set_cpus_allowed() will not do the right thing.
+         *
+         * And since this is boot we can forgo the serialization.
+         */
+        set_cpus_allowed_common(idle, cpumask_of(cpu));
+#endif
         /*
          * We're having a chicken and egg problem, even though we are
          * holding rq->lock, the cpu isn't yet set to this cpu so the
@@ -4944,7 +4952,7 @@ void init_idle(struct task_struct *idle, int cpu)
 
         rq->curr = rq->idle = idle;
         idle->on_rq = TASK_ON_RQ_QUEUED;
-#if defined(CONFIG_SMP)
+#ifdef CONFIG_SMP
         idle->on_cpu = 1;
 #endif
         raw_spin_unlock(&rq->lock);
@@ -4959,7 +4967,7 @@ void init_idle(struct task_struct *idle, int cpu)
         idle->sched_class = &idle_sched_class;
         ftrace_graph_init_idle_task(idle, cpu);
         vtime_init_idle(idle, cpu);
-#if defined(CONFIG_SMP)
+#ifdef CONFIG_SMP
         sprintf(idle->comm, "%s/%d", INIT_TASK_COMM, cpu);
 #endif
 }