Tejun Heo 83236b2e43 sched_ext: Disable preemption between scx_claim_exit() and kicking helper work ... scx_claim_exit() atomically sets exit_kind, which prevents scx_error() from triggering further error handling. After claiming exit, the caller must kick the helper kthread work which initiates bypass mode and teardown. If the calling task gets preempted between claiming exit and kicking the helper work, and the BPF scheduler fails to schedule it back (since error handling is now disabled), the helper work is never queued, bypass mode never activates, tasks stop being dispatched, and the system wedges. Disable preemption across scx_claim_exit() and the subsequent work kicking in all callers - scx_disable() and scx_vexit(). Add lockdep_assert_preemption_disabled() to scx_claim_exit() to enforce the requirement. Fixes: f0e1a0643a ("sched_ext: Implement BPF extensible scheduler class") Cc: stable@vger.kernel.org # v6.12+ Reviewed-by: Andrea Righi <arighi@nvidia.com> Signed-off-by: Tejun Heo <tj@kernel.org>		2026-02-24 21:39:58 -10:00
..
bpf	bpf: Switch to bpf_selem_unlink_nofail in bpf_local_storage_{map_free, destroy}	2026-02-06 14:47:59 -08:00
cgroup	cgroup: Changes for v6.20	2026-02-11 13:20:50 -08:00
configs	hung_task: panic when there are more than N hung tasks at the same time	2025-11-12 10:00:14 -08:00
debug	kdb: Adapt kdb_msg_write to work with NBCON consoles	2025-10-24 12:56:20 +02:00
dma	powerpc updates for 7.0	2026-02-10 21:46:12 -08:00
entry	Merge branch 'core/entry' into sched/core	2026-01-30 15:40:05 +01:00
events	Performance events changes for v7.0:	2026-02-10 12:00:46 -08:00
futex	Futex changes for v6.19:	2025-12-10 17:21:30 +09:00
gcov	gcov: add support for GCC 15	2025-11-09 21:19:44 -08:00
irq	pci-v7.0-changes	2026-02-11 17:20:38 -08:00
kcsan	kcsan: Enable context analysis	2026-01-05 16:43:35 +01:00
livepatch	livepatch: Fix having __klp_objects relics in non-livepatch modules	2026-02-05 08:00:44 -08:00
liveupdate	liveupdate: luo_file: do not clear serialized_data on unfreeze	2026-02-02 18:43:55 -08:00
locking	test-ww_mutex: Allow test to be run (and re-run) from userland	2025-12-18 10:45:23 +01:00
module	Modules changes for v7.0-rc1	2026-02-10 09:49:18 -08:00
power	Merge branch 'pm-sleep'	2026-02-04 20:52:09 +01:00
printk	Networking changes for 7.0	2026-02-11 19:31:52 -08:00
rcu	Merge branch 'rcu-nocb.20260123a'	2026-01-23 11:15:36 -08:00
sched	sched_ext: Disable preemption between scx_claim_exit() and kicking helper work	2026-02-24 21:39:58 -10:00
time	Updates for the core time subsystem:	2026-02-10 16:41:59 -08:00
trace	bpf-next-7.0	2026-02-10 11:26:21 -08:00
unwind	unwind_user/fp: Use dummies instead of ifdef	2025-12-17 13:31:07 +01:00
.gitignore	kheaders: rebuild kheaders_data.tar.xz when a file is modified within a minute	2025-06-24 20:30:37 +09:00
acct.c	simplify the callers of file_open_name()	2026-01-13 15:18:08 -05:00
async.c
audit.c	audit: include source and destination ports to NETFILTER_PKT	2025-12-16 11:04:14 -05:00
audit.h	audit: fix comment misindentation in audit.h	2025-10-22 19:28:06 -04:00
audit_fsnotify.c	VFS/audit: introduce kern_path_parent() for audit	2025-09-23 12:37:35 +02:00
audit_tree.c	mount-related stuff for this cycle	2025-10-03 10:19:44 -07:00
audit_watch.c	VFS/audit: introduce kern_path_parent() for audit	2025-09-23 12:37:35 +02:00
auditfilter.c	audit: Use kzalloc() instead of kmalloc()/memset() in audit_krule_to_data()	2025-11-07 16:38:34 -05:00
auditsc.c	struct filename ->refcnt doesn't need to be atomic	2026-01-13 15:18:07 -05:00
backtracetest.c
bounds.c	x86/asm: Remove ANNOTATE_DATA_SPECIAL usage	2025-12-03 16:53:19 +01:00
capability.c	capability: Remove unused has_capability	2025-03-07 22:03:09 -06:00
cfi.c	cfi: Move BPF CFI types and helpers to generic code	2025-07-31 18:23:53 -07:00
compat.c
configs.c
context_tracking.c	context_tracking: Remove rcu_task_trace_heavyweight_{enter,exit}()	2026-01-01 16:39:46 +08:00
cpu.c	cpu: Provide lockdep check for CPU hotplug lock write-held	2026-02-03 15:23:33 +01:00
cpu_pm.c	syscore: Pass context data to callbacks	2025-11-14 10:01:52 +01:00
crash_core.c	crash: fix crashkernel resource shrink	2025-11-15 10:52:01 -08:00
crash_core_test.c	crash: add KUnit tests for crash_exclude_mem_range	2025-09-13 17:32:55 -07:00
crash_dump_dm_crypt.c	crash_dump: retrieve dm crypt keys in kdump kernel	2025-05-21 10:48:21 -07:00
crash_reserve.c	crash: let architecture decide crash memory export to iomem_resource	2025-11-12 10:00:15 -08:00
cred.c	cred: remove unused set_security_override_from_ctx()	2026-01-06 20:52:57 -05:00
delayacct.c	delayacct: remove redundant code and adjust indentation	2025-05-27 19:40:33 -07:00
dma.c
elfcorehdr.c
exec_domain.c
exit.c	Significant patch series in this pull request:	2025-12-06 14:01:20 -08:00
exit.h
extable.c
fail_function.c
fork.c	io_uring-bpf-restrictions.4-20260206	2026-02-09 17:31:17 -08:00
freezer.c	freezer: Clarify that only cgroup1 freezer uses PM freezer	2025-10-30 20:10:27 +01:00
gen_kheaders.sh	kheaders: make it possible to override TAR	2025-08-06 10:23:36 +09:00
groups.c
hung_task.c	hung_task: add hung_task_sys_info sysctl to dump sys info on task-hung	2025-11-20 14:03:43 -08:00
iomem.c	mm/memremap: Pass down MEMREMAP_* flags to arch_memremap_wb()	2025-02-21 15:05:38 +01:00
irq_work.c	kasan: make kasan_record_aux_stack_noalloc() the default behaviour	2025-01-13 22:40:36 -08:00
jump_label.c	jump_label: Use RCU in all users of __module_text_address().	2025-03-10 11:54:46 +01:00
kallsyms.c	kallsyms: Get rid of kallsyms relative base	2026-01-22 15:58:22 -07:00
kallsyms_internal.h	kallsyms: Get rid of kallsyms relative base	2026-01-22 15:58:22 -07:00
kallsyms_selftest.c	kallsyms: use kmalloc_array() instead of kmalloc()	2025-09-28 11:36:14 -07:00
kallsyms_selftest.h
kcmp.c	kcmp: improve performance adding an unlikely hint to task comparisons	2025-02-21 10:25:33 +01:00
Kconfig.freezer
Kconfig.hz	kernel: Fix "select" wording on HZ_250 description	2025-02-21 09:20:30 +01:00
Kconfig.kexec	liveupdate: kho: move to kernel/liveupdate	2025-11-27 14:24:33 -08:00
Kconfig.locks
Kconfig.preempt	sched: Further restrict the preemption modes	2026-01-08 12:43:57 +01:00
kcov.c	kcov: Use scoped init guard	2026-01-28 20:45:24 +01:00
kexec.c	kexec: enable CMA based contiguous allocation	2025-08-02 12:01:38 -07:00
kexec_core.c	kernel/kexec: fix IMA when allocation happens in CMA area	2025-12-23 11:23:14 -08:00
kexec_elf.c	kexec: initialize ELF lowest address to ULONG_MAX	2025-03-16 22:30:47 -07:00
kexec_file.c	x86/kexec: carry forward the boot DTB on kexec	2025-09-13 17:32:43 -07:00
kexec_internal.h	kexec: enable CMA based contiguous allocation	2025-08-02 12:01:38 -07:00
kheaders.c	kheaders: Simplify attribute through __BIN_ATTR_SIMPLE_RO()	2024-12-24 09:46:49 +01:00
kprobes.c	kprobes: Add missing kerneldoc for __get_insn_slot	2025-07-15 18:45:34 +09:00
kstack_erase.c	sysctl: remove __user qualifier from stack_erasing_sysctl buffer argument	2025-11-27 15:44:53 +01:00
ksyms_common.c
ksysfs.c	kexec: move sysfs entries to /sys/kernel/kexec	2025-11-27 14:24:42 -08:00
kthread.c	The kthread code provides an infrastructure which manages the preferred	2026-02-09 19:57:30 -08:00
latencytop.c	treewide: const qualify ctl_tables where applicable	2025-01-28 13:48:37 +01:00
Makefile	kcov: Enable context analysis	2026-01-05 16:43:34 +01:00
module_signature.c
notifier.c	reboot: move reboot_notifier_list to kernel/reboot.c	2024-11-05 17:12:31 -08:00
nscommon.c	ns: rename is_initial_namespace()	2025-11-11 10:01:31 +01:00
nsproxy.c	nsproxy: fix free_nsproxy() and simplify create_new_namespaces()	2025-11-14 13:10:38 +01:00
nstree.c	nstree: fix kernel-doc comments for internal functions	2025-11-14 13:10:38 +01:00
padata.c	padata: Constify padata_sysfs_entry structs	2026-01-23 13:48:44 +08:00
panic.c	panic: only warn about deprecated panic_print on write access	2026-01-19 12:30:01 -08:00
params.c	params: Replace __modinit with __init_or_module	2025-12-22 16:35:53 +00:00
pid.c	pid: only take pidmap_lock once on alloc	2025-12-15 14:33:38 +01:00
pid_namespace.c	pid: rely on common reference count behavior	2025-11-11 10:01:32 +01:00
pid_sysctl.h	treewide: const qualify ctl_tables where applicable	2025-01-28 13:48:37 +01:00
profile.c
ptrace.c	rseq: Introduce struct rseq_data	2025-11-04 08:30:50 +01:00
range.c
reboot.c	- The 7 patch series "powerpc/crash: use generic crashkernel	2025-04-01 10:06:52 -07:00
regset.c
relay.c	relay: update relay to use mmap_prepare	2025-11-16 17:28:11 -08:00
resource.c	resource: Increase MAX_IORES_LEVEL to 8	2026-01-27 16:36:51 -06:00
resource_kunit.c	resource, kunit: fix user-after-free in resource_test_region_intersects()	2024-10-09 12:47:19 -07:00
rseq.c	rseq: Lower default slice extension	2026-01-22 11:11:20 +01:00
scftorture.c	scftorture: Handle NULL argument passed to scf_add_to_free_list().	2024-11-14 16:09:51 -08:00
scs.c	scs: fix a wrong parameter in __scs_magic	2025-11-12 10:00:13 -08:00
seccomp.c	Performance events updates for v6.18:	2025-09-30 11:11:21 -07:00
signal.c	compiler-context-analysis: Remove __cond_lock() function-like helper	2026-01-05 16:43:33 +01:00
smp.c	smp: Introduce a helper function to check for pending IPIs	2025-11-19 18:06:50 +01:00
smpboot.c	sched/smp: Use the SMP version of idle_thread_set_boot_cpu()	2025-06-13 08:47:20 +02:00
smpboot.h
softirq.c	softirq: Allow to drop the softirq-BKL lock on PREEMPT_RT	2025-09-17 16:25:41 +02:00
stacktrace.c
static_call.c
static_call_inline.c	Modules changes for 6.15-rc1	2025-03-30 15:44:36 -07:00
stop_machine.c	sched/core: Fix migrate_swap() vs. hotplug	2025-07-01 15:02:03 +02:00
sys.c	Updates for the VDSO subsystem:	2026-02-10 17:02:23 -08:00
sys_ni.c	rseq: Implement sys_rseq_slice_yield()	2026-01-22 11:11:17 +01:00
sysctl-test.c	sysctl: move u8 register test to lib/test_sysctl.c	2025-04-14 14:13:41 +02:00
sysctl.c	sysctl: Wrap do_proc_douintvec with the public function proc_douintvec_conv	2025-11-27 15:45:38 +01:00
task_work.c	task_work: Fix NMI race condition	2025-10-29 10:29:54 +01:00
taskstats.c	fdget(), more trivial conversions	2024-11-03 01:28:06 -05:00
torture.c	torture: Delay CPU-hotplug operations until boot completes	2025-08-14 15:26:30 -07:00
tracepoint.c	tracepoint: Print the function symbol when tracepoint_debug is set	2025-03-21 15:30:10 -04:00
tsacct.c	pid: change bacct_add_tsk() to use task_ppid_nr_ns()	2025-08-19 13:38:20 +02:00
ucount.c	ucount: use atomic_long_try_cmpxchg() in atomic_long_inc_below()	2025-08-02 12:01:38 -07:00
uid16.c
uid16.h
umh.c	treewide: const qualify ctl_tables where applicable	2025-01-28 13:48:37 +01:00
up.c
user-return-notifier.c
user.c	ns: drop custom reference count initialization for initial namespaces	2025-11-11 10:01:32 +01:00
user_namespace.c	ns: move ns type into struct ns_common	2025-09-25 09:23:54 +02:00
utsname.c	namespace-6.18-rc1	2025-09-29 11:20:29 -07:00
utsname_sysctl.c	treewide: const qualify ctl_tables where applicable	2025-01-28 13:48:37 +01:00
vhost_task.c	vhost: Take a reference on the task in struct vhost_task.	2025-09-21 17:44:20 -04:00
vmcore_info.c	Kbuild/Kconfig updates for 7.0	2026-02-11 13:40:35 -08:00
watch_queue.c	watch_queue: Use local kmap in post_one_notification()	2025-11-19 12:17:28 +01:00
watchdog.c	powerpc/watchdog: add support for hardlockup_sys_info sysctl	2026-01-14 22:16:22 -08:00
watchdog_buddy.c	watchdog: fix opencoded cpumask_next_wrap() in watchdog_next_cpu()	2025-07-31 11:28:03 -04:00
watchdog_perf.c	watchdog: skip checks when panic is in progress	2025-09-13 17:32:53 -07:00
workqueue.c	workqueue: Changes for v6.20	2026-02-11 13:13:32 -08:00
workqueue_internal.h