Re: [PATCH sched_ext/for-7.1-fixes] sched_ext: Use global task iter in scx_sub_enable_workfn() abort

[Tejun Heo]

Hello,

The bug you reported is real but the proposed fix isn't quite right -
switching to global iteration in the abort path closes one window but
leaves scx_sub_disable() and scx_fail_parent() exposed to the same
iter-vs-sched_ext_dead() race in different forms, and the prep loop in
scx_sub_enable_workfn() also has problems with tasks past
sched_ext_dead().

I've posted a two-patch series that addresses the underlying issue at
the iter level:

  https://lore.kernel.org/lkml/20260428001635.3293997-1-tj@xxxxxxxxxx/

Thanks for the report.

--
tejun