Commit 0eca95cb authored by Tejun Heo's avatar Tejun Heo
Browse files

sched_ext: Short-circuit sched_class operations on dead tasks 



7900aa69 ("sched_ext: Fix cgroup exit ordering by moving sched_ext_free()
to finish_task_switch()") moved sched_ext_free() to finish_task_switch() and
renamed it to sched_ext_dead() to fix cgroup exit ordering issues. However,
this created a race window where certain sched_class ops may be invoked on
dead tasks leading to failures - e.g. sched_setscheduler() may try to switch a
task which finished sched_ext_dead() back into SCX triggering invalid SCX task
state transitions.

Add task_dead_and_done() which tests whether a task is TASK_DEAD and has
completed its final context switch, and use it to short-circuit sched_class
operations which may be called on dead tasks.

Fixes: 7900aa69 ("sched_ext: Fix cgroup exit ordering by moving sched_ext_free() to finish_task_switch()")
Reported-by: default avatarAndrea Righi <arighi@nvidia.com>
Link: http://lkml.kernel.org/r/20260202151341.796959-1-arighi@nvidia.com


Reviewed-by: default avatarAndrea Righi <arighi@nvidia.com>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent c9894e6f

kernel/sched/ext.c

+48 −0
Original line number Diff line number Diff line
@@ -194,6 +194,7 @@ MODULE_PARM_DESC(bypass_lb_intv_us, "bypass load balance interval in microsecond 
#include <trace/events/sched_ext.h>



static void process_ddsp_deferred_locals(struct rq *rq);

static bool task_dead_and_done(struct task_struct *p);

static u32 reenq_local(struct rq *rq);

static void scx_kick_cpu(struct scx_sched *sch, s32 cpu, u64 flags);

static bool scx_vexit(struct scx_sched *sch, enum scx_exit_kind kind,
@@ -2618,6 +2619,9 @@ static void set_cpus_allowed_scx(struct task_struct *p, 


	set_cpus_allowed_common(p, ac);



	if (task_dead_and_done(p))

		return;



	/*

	 * The effective cpumask is stored in @p->cpus_ptr which may temporarily

	 * differ from the configured one in @p->cpus_mask. Always tell the bpf
@@ -3033,10 +3037,45 @@ void scx_cancel_fork(struct task_struct *p) 
	percpu_up_read(&scx_fork_rwsem);

}



/**

 * task_dead_and_done - Is a task dead and done running?

 * @p: target task

 *

 * Once sched_ext_dead() removes the dead task from scx_tasks and exits it, the

 * task no longer exists from SCX's POV. However, certain sched_class ops may be

 * invoked on these dead tasks leading to failures - e.g. sched_setscheduler()

 * may try to switch a task which finished sched_ext_dead() back into SCX

 * triggering invalid SCX task state transitions and worse.

 *

 * Once a task has finished the final switch, sched_ext_dead() is the only thing

 * that needs to happen on the task. Use this test to short-circuit sched_class

 * operations which may be called on dead tasks.

 */

static bool task_dead_and_done(struct task_struct *p)

{

	struct rq *rq = task_rq(p);



	lockdep_assert_rq_held(rq);



	/*

	 * In do_task_dead(), a dying task sets %TASK_DEAD with preemption

	 * disabled and __schedule(). If @p has %TASK_DEAD set and off CPU, @p

	 * won't ever run again.

	 */

	return unlikely(READ_ONCE(p->__state) == TASK_DEAD) &&

		!task_on_cpu(rq, p);

}



void sched_ext_dead(struct task_struct *p)

{

	unsigned long flags;



	/*

	 * By the time control reaches here, @p has %TASK_DEAD set, switched out

	 * for the last time and then dropped the rq lock - task_dead_and_done()

	 * should be returning %true nullifying the straggling sched_class ops.

	 * Remove from scx_tasks and exit @p.

	 */

	raw_spin_lock_irqsave(&scx_tasks_lock, flags);

	list_del_init(&p->scx.tasks_node);

	raw_spin_unlock_irqrestore(&scx_tasks_lock, flags);
@@ -3062,6 +3101,9 @@ static void reweight_task_scx(struct rq *rq, struct task_struct *p, 


	lockdep_assert_rq_held(task_rq(p));



	if (task_dead_and_done(p))

		return;



	p->scx.weight = sched_weight_to_cgroup(scale_load_down(lw->weight));

	if (SCX_HAS_OP(sch, set_weight))

		SCX_CALL_OP_TASK(sch, SCX_KF_REST, set_weight, rq,
@@ -3076,6 +3118,9 @@ static void switching_to_scx(struct rq *rq, struct task_struct *p) 
{

	struct scx_sched *sch = scx_root;



	if (task_dead_and_done(p))

		return;



	scx_enable_task(p);



	/*
@@ -3089,6 +3134,9 @@ static void switching_to_scx(struct rq *rq, struct task_struct *p) 


static void switched_from_scx(struct rq *rq, struct task_struct *p)

{

	if (task_dead_and_done(p))

		return;



	scx_disable_task(p);

}