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sched_ext: Fixes for v7.3-rc3

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- An error raised by a BPF program before the scheduler finished enabling
   was consumed by the disable path's pre-enable shortcut, leaving a
   running scheduler that couldn't be disabled and was later freed while
   in use.
 
 - Two compat kfuncs dereferenced a NULL scheduler when handed an exited
   or idle task, oopsing the kernel.
 
 - Keep-running decisions in the dispatch path used the root scheduler's
   flags for tasks belonging to a sub-scheduler, causing warnings and
   stalls.
 
 - Schedulers with their own CPU ID mapping had no way to learn which IDs
   are online. Add a kernel-maintained online mask to plug the hole.
 
 - Cgroup idle state: the initial cpu.idle state wasn't passed on cgroup
   init and same-value rewrites delivered spurious callbacks.
 
 - Example scheduler fixes for a reenqueue loop on attach, placements on
   CPUs without effective grants, stalled partition work and stale idle
   tracking.
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Merge tag 'sched_ext-for-7.3-rc3-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext

Pull sched_ext fixes from Tejun Heo:

 - An error raised by a BPF program before the scheduler finished
   enabling was consumed by the disable path's pre-enable shortcut,
   leaving a running scheduler that couldn't be disabled and was later
   freed while in use.

 - Two compat kfuncs dereferenced a NULL scheduler when handed an exited
   or idle task, oopsing the kernel.

 - Keep-running decisions in the dispatch path used the root scheduler's
   flags for tasks belonging to a sub-scheduler, causing warnings and
   stalls.

 - Schedulers with their own CPU ID mapping had no way to learn which
   IDs are online. Add a kernel-maintained online mask to plug the hole.

 - Cgroup idle state: the initial cpu.idle state wasn't passed on cgroup
   init and same-value rewrites delivered spurious callbacks.

 - Example scheduler fixes for a reenqueue loop on attach, placements on
   CPUs without effective grants, stalled partition work and stale idle
   tracking.

* tag 'sched_ext-for-7.3-rc3-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext:
  sched_ext: Maintain an online cid mask in the scheduler arena
  sched_ext: scx_qmap: Restore unused idle claims from ops.dispatch()
  sched_ext: Close the pre-enable ops error claim window
  sched_ext: scx_qmap: Fix pending partition work handoff
  sched_ext: scx_qmap: Place only on cids whose caps are in effect
  sched_ext: scx_qmap: Do not add IMMED to rescue inserts
  sched_ext: Use @prev's scheduler for the keep decisions in dispatch_one()
  sched_ext: Rename sch to root_sch in dispatch_one()
  sched_ext: Fix NULL sched deref in kfunc sub-sched error paths
  sched_ext: Don't deliver duplicate ops.cgroup_set_idle() for same value
  sched_ext: Pass the initial cpu.idle state in scx_cgroup_init_args
This commit is contained in:
Linus Torvalds 2026-09-15 11:57:51 -07:00
commit 9b87fdc9af
7 changed files with 254 additions and 89 deletions
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