We have identified that upstream commit 00b89fe0197f0c55a045775c11553c0cdb7082fe ("sched: Make the idle task quack like a per-CPU kthread") causes this, and its revert fixes the problem.
@smb identified commit a8ea6fc9b089156d9230bfeef964dd9be101a4a9 ("sched: Stop PF_NO_SETAFFINITY from being inherited by various init system threads") should probably fix it, which will be tested and sent as part of a respin for 5.11.
We have identified that upstream commit 00b89fe0197f0c5 5a045775c11553c 0cdb7082fe ("sched: Make the idle task quack like a per-CPU kthread") causes this, and its revert fixes the problem.
@smb identified commit a8ea6fc9b089156 d9230bfeef964dd 9be101a4a9 ("sched: Stop PF_NO_SETAFFINITY from being inherited by various init system threads") should probably fix it, which will be tested and sent as part of a respin for 5.11.
Cascardo.