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A single fix for the scheduler. A recent commit changed the runqueue

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counter nr_uninterruptible to an unsigned int. Due to the fact that the
 counters are not updated on migration of a uninterruptble task to a
 different CPU, these counters can exceed INT_MAX. The counter is cast to
 long in the load average calculation, which means that the cast expands
 into negative space resulting in bogus load average values. Convert it back
 to unsigned long to fix this.
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Merge tag 'sched-urgent-2025-07-20' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull scheduler fix from Thomas Gleixner:
 "A single fix for the scheduler.

  A recent commit changed the runqueue counter nr_uninterruptible to an
  unsigned int. Due to the fact that the counters are not updated on
  migration of a uninterruptble task to a different CPU, these counters
  can exceed INT_MAX.

  The counter is cast to long in the load average calculation, which
  means that the cast expands into negative space resulting in bogus
  load average values.

  Convert it back to unsigned long to fix this.

* tag 'sched-urgent-2025-07-20' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched: Change nr_uninterruptible type to unsigned long
This commit is contained in:
Linus Torvalds 2025-07-20 11:08:51 -07:00
commit 62347e2790
2 changed files with 2 additions and 2 deletions
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2
kernel/sched/loadavg.c
View File

@ -80,7 +80,7 @@ long calc_load_fold_active(struct rq *this_rq, long adjust)
long nr_active, delta = 0;
nr_active = this_rq->nr_running - adjust;
nr_active += (int)this_rq->nr_uninterruptible;
nr_active += (long)this_rq->nr_uninterruptible;
if (nr_active != this_rq->calc_load_active) {
delta = nr_active - this_rq->calc_load_active;

2
kernel/sched/sched.h
View File

@ -1149,7 +1149,7 @@ struct rq {
* one CPU and if it got migrated afterwards it may decrease
* it on another CPU. Always updated under the runqueue lock:
*/
unsigned int nr_uninterruptible;
unsigned long nr_uninterruptible;
union {
struct task_struct __rcu *donor; /* Scheduler context */