From: Mike Galbraith <efa...@gmx.de>
commit cd4d35ef89948221f7cd1751cee453943967364c from linux-rt-devel.
Since commit 7af443ee16976 ("sched/core: Require cpu_active() in
select_task_rq(), for user tasks") select_fallback_rq() will BUG() if
the CPU to which a task has pinned itself and pinned becomes
!cpu_active() while it slept.
The task will continue running on the to-be-removed CPU and will remove
itself from the CPU during takedown_cpu() (while cpuhp_pin_lock will be
acquired) and move to another CPU based on its mask after the
migrate_disable() section has been left.
Cc: stable...@vger.kernel.org
Signed-off-by: Mike Galbraith <efa...@gmx.de>
Signed-off-by: Sebastian Andrzej Siewior <bige...@linutronix.de>
Signed-off-by: Paul Gortmaker <paul.gortma...@windriver.com>
---
kernel/sched/core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 530118fbfe21..7d789c1b316b 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -968,7 +968,7 @@ static inline bool is_cpu_allowed(struct task_struct *p,
int cpu)
if (!cpumask_test_cpu(cpu, p->cpus_ptr))
return false;
- if (is_per_cpu_kthread(p))
+ if (is_per_cpu_kthread(p) || __migrate_disabled(p))
return cpu_online(cpu);
return cpu_active(cpu);
--
2.15.0
--
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