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A single scheduler fix preventing a crash in NUMA balancing. The

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current->mm check is not reliable as the mm might be temporary
 due to use_mm() in a kthread. Check for PF_KTHREAD explictely.
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Merge tag 'sched-urgent-2020-05-31' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull scheduler fix from Thomas Gleixner:
 "A single scheduler fix preventing a crash in NUMA balancing.

  The current->mm check is not reliable as the mm might be temporary due
  to use_mm() in a kthread. Check for PF_KTHREAD explictly"

* tag 'sched-urgent-2020-05-31' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched/fair: Don't NUMA balance for kthreads
This commit is contained in:
Linus Torvalds 2020-05-31 10:43:17 -07:00
commit 3d04282329
1 changed files with 1 additions and 1 deletions
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2
kernel/sched/fair.c
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@ -2908,7 +2908,7 @@ static void task_tick_numa(struct rq *rq, struct task_struct *curr)
/*
* We don't care about NUMA placement if we don't have memory.
*/
if (!curr->mm || (curr->flags & PF_EXITING) || work->next != work)
if ((curr->flags & (PF_EXITING | PF_KTHREAD)) || work->next != work)
return;
/*