sched_ext: Fixes for v6.19-rc8

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- Fix race where sched_class operations (sched_setscheduler() and friends)
   could be invoked on dead tasks after sched_ext_dead() already ran, causing
   invalid SCX task state transitions and NULL pointer dereferences. This was
   a regression from the cgroup exit ordering fix which moved
   sched_ext_free() to finish_task_switch().
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Merge tag 'sched_ext-for-6.19-rc8-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext

Pull sched_ext fix from Tejun Heo:

 - Fix race where sched_class operations (sched_setscheduler() and
   friends) could be invoked on dead tasks after sched_ext_dead()
   already ran, causing invalid SCX task state transitions and NULL
   pointer dereferences.

   This was a regression from the cgroup exit ordering fix which
   moved sched_ext_free() to finish_task_switch().

* tag 'sched_ext-for-6.19-rc8-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext:
  sched_ext: Short-circuit sched_class operations on dead tasks

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Linus Torvalds 2026-02-04 15:11:24 -08:00

parent 27db1ae6ec 0eca95cba2

commit 3c7b4d1994

1 changed files with 48 additions and 0 deletions

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kernel/sched/ext.c

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