en Copyright 2015 Java http://kernelsources.org:8080/source/history/linux/tools/testing/selftests/sched_ext/cyclic_kick_wait.c#9147566d801602c9e7fc7f85e989735735bf38ba Merge tag 'sched_ext-for-7.0-rc6-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_extPull sched_ext fixes from Tejun Heo: - Fix SCX_KICK_WAIT deadlock where multiple CPUs waiting for each other in hardirq context form a cycle. Move the wait to a balance callback which can drop the rq lock and process IPIs. - Fix inconsistent NUMA node lookup in scx_select_cpu_dfl() where the waker_node used cpu_to_node() while prev_cpu used scx_cpu_node_if_enabled(), leading to undefined behavior when per-node idle tracking is disabled.* tag 'sched_ext-for-7.0-rc6-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext: selftests/sched_ext: Add cyclic SCX_KICK_WAIT stress test sched_ext: Fix SCX_KICK_WAIT deadlock by deferring wait to balance callback sched_ext: Fix inconsistent NUMA node lookup in scx_select_cpu_dfl() List of files: /linux/tools/testing/selftests/sched_ext/cyclic_kick_wait.c Tue, 31 Mar 2026 23:23:12 +0200 Linus Torvalds <torvalds@linux-foundation.org> http://kernelsources.org:8080/source/history/linux/tools/testing/selftests/sched_ext/cyclic_kick_wait.c#090d34f0f0285124452373225bcc520a31e305e4 selftests/sched_ext: Add cyclic SCX_KICK_WAIT stress testAdd a test that creates a 3-CPU kick_wait cycle (A->B->C->A). A BPFscheduler kicks the next CPU in the ring with SCX_KICK_WAIT on everyenqueue while userspace workers generate continuous scheduling churn viasched_yield(). Without the preceding fix, this hangs the machine within seconds.Signed-off-by: Tejun Heo <tj@kernel.org>Reviewed-by: Christian Loehle <christian.loehle@arm.com>Tested-by: Christian Loehle <christian.loehle@arm.com> List of files: /linux/tools/testing/selftests/sched_ext/cyclic_kick_wait.c Sun, 29 Mar 2026 01:18:56 +0100 Tejun Heo <tj@kernel.org>