Boqun Feng 03d5bdd24d locking/lockdep: Decrease nr_unused_locks if lock unused in zap_class() ... commit 495f53d5cc upstream. Currently, when a lock class is allocated, nr_unused_locks will be increased by 1, until it gets used: nr_unused_locks will be decreased by 1 in mark_lock(). However, one scenario is missed: a lock class may be zapped without even being used once. This could result into a situation that nr_unused_locks != 0 but no unused lock class is active in the system, and when `cat /proc/lockdep_stats`, a WARN_ON() will be triggered in a CONFIG_DEBUG_LOCKDEP=y kernel: [...] DEBUG_LOCKS_WARN_ON(debug_atomic_read(nr_unused_locks) != nr_unused) [...] WARNING: CPU: 41 PID: 1121 at kernel/locking/lockdep_proc.c:283 lockdep_stats_show+0xba9/0xbd0 And as a result, lockdep will be disabled after this. Therefore, nr_unused_locks needs to be accounted correctly at zap_class() time. Signed-off-by: Boqun Feng <boqun.feng@gmail.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Reviewed-by: Waiman Long <longman@redhat.com> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20250326180831.510348-1-boqun.feng@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2025-05-02 07:40:55 +02:00
..
bpf	bpf: skip non exist keys in generic_map_lookup_batch	2025-03-13 12:47:29 +01:00
cgroup	cgroup/bpf: only cgroup v2 can be attached by bpf programs	2024-12-14 19:47:47 +01:00
configs
debug	kdb: Do not assume write() callback available	2025-03-13 12:47:22 +01:00
dma	dma-debug: fix a possible deadlock on radix_lock	2024-12-14 19:48:28 +01:00
entry	entry/kvm: Exit to user mode when TIF_NOTIFY_SIGNAL is set	2023-01-04 11:39:22 +01:00
events	perf/ring_buffer: Allow the EPOLLRDNORM flag for poll	2025-04-10 14:30:56 +02:00
futex	futex: Don't include process MM in futex key on no-MMU	2023-11-20 11:06:44 +01:00
gcov	gcov: add support for GCC 14	2024-07-05 09:12:41 +02:00
irq	genirq: Make handle_enforce_irqctx() unconditionally available	2025-03-13 12:46:45 +01:00
kcsan	kcsan: Turn report_filterlist_lock into a raw_spinlock	2024-12-14 19:48:25 +01:00
livepatch	kallsyms: refactor {,module_}kallsyms_on_each_symbol	2024-06-21 14:52:58 +02:00
locking	locking/lockdep: Decrease nr_unused_locks if lock unused in zap_class()	2025-05-02 07:40:55 +02:00
power	PM: hibernate: Add error handling for syscore_suspend()	2025-03-13 12:46:57 +01:00
printk	printk: Fix signed integer overflow when defining LOG_BUF_LEN_MAX	2025-03-13 12:47:01 +01:00
rcu	rcu-tasks: Idle tasks on offline CPUs are in quiescent states	2024-12-14 19:47:42 +01:00
sched	sched/deadline: Use online cpus for validating runtime	2025-04-10 14:31:00 +02:00
time	hrtimers: Mark is_migration_base() with __always_inline	2025-04-10 14:30:49 +02:00
trace	tracing: fix return value in __ftrace_event_enable_disable for TRACE_REG_UNREGISTER	2025-05-02 07:40:50 +02:00
.gitignore
acct.c	acct: perform last write from workqueue	2025-03-13 12:47:35 +01:00
async.c	async: Introduce async_schedule_dev_nocall()	2024-02-23 08:41:53 +01:00
audit_fsnotify.c	fsnotify: make allow_dups a property of the group	2024-06-21 14:53:39 +02:00
audit_tree.c	fsnotify: pass flags argument to fsnotify_alloc_group()	2024-06-21 14:53:39 +02:00
audit_watch.c	fsnotify: pass flags argument to fsnotify_alloc_group()	2024-06-21 14:53:39 +02:00
audit.c	audit: Send netlink ACK before setting connection in auditd_set	2024-02-23 08:42:03 +01:00
audit.h
auditfilter.c	ima: Avoid blocking in RCU read-side critical section	2024-07-18 13:05:44 +02:00
auditsc.c	audit: fix possible soft lockup in __audit_inode_child()	2023-09-19 12:20:13 +02:00
backtracetest.c
bounds.c	bounds: Use the right number of bits for power-of-two CONFIG_NR_CPUS	2024-05-02 16:23:46 +02:00
capability.c
compat.c	sched_getaffinity: don't assume 'cpumask_size()' is fully initialized	2023-04-05 11:23:45 +02:00
configs.c
context_tracking.c
cpu_pm.c
cpu.c	hrtimers: Handle CPU state correctly on hotplug	2025-02-01 18:22:29 +01:00
crash_core.c
crash_dump.c
cred.c	cred: switch to using atomic_long_t	2023-12-20 15:44:30 +01:00
delayacct.c
dma.c
exec_domain.c
exit.c	mm: optimize the redundant loop of mm_update_owner_next()	2024-07-18 13:05:42 +02:00
extable.c
fail_function.c	kernel/fail_function: fix memory leak with using debugfs_lookup()	2023-03-11 16:40:18 +01:00
fork.c	exec: Simplify unshare_files	2024-06-21 14:52:47 +02:00
freezer.c
gen_kheaders.sh	kheaders: Ignore silly-rename files	2025-02-01 18:22:28 +01:00
groups.c
hung_task.c
iomem.c
irq_work.c
jump_label.c
kallsyms.c	kallsyms: Make kallsyms_on_each_symbol generally available	2024-10-17 15:08:29 +02:00
kcmp.c	kcmp: In get_file_raw_ptr use task_lookup_fd_rcu	2024-06-21 14:52:48 +02:00
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt
kcov.c	kcov: don't lose track of remote references during softirqs	2024-07-05 09:12:41 +02:00
kexec_core.c	kexec: fix a memory leak in crash_shrink_memory()	2023-07-27 08:43:40 +02:00
kexec_elf.c	kexec: initialize ELF lowest address to ULONG_MAX	2025-04-10 14:30:58 +02:00
kexec_file.c	kexec: support purgatories with .text.hot sections	2023-06-21 15:45:37 +02:00
kexec_internal.h	panic, kexec: make __crash_kexec() NMI safe	2023-04-20 12:10:29 +02:00
kexec.c	panic, kexec: make __crash_kexec() NMI safe	2023-04-20 12:10:29 +02:00
kheaders.c	kheaders: Use array declaration instead of char	2023-05-17 11:47:33 +02:00
kmod.c
kprobes.c	x86/ibt,ftrace: Search for __fentry__ location	2024-10-17 15:07:37 +02:00
ksysfs.c	kexec: turn all kexec_mutex acquisitions into trylocks	2023-04-20 12:10:29 +02:00
kthread.c	kthread: fix task state in kthread worker if being frozen	2024-10-17 15:07:50 +02:00
latencytop.c
Makefile	futex: Move to kernel/futex/	2023-01-14 10:15:20 +01:00
module_signature.c
module_signing.c
module-internal.h
module.c	kallsyms: Make module_kallsyms_on_each_symbol generally available	2024-10-17 15:08:29 +02:00
notifier.c
nsproxy.c
padata.c	padata: avoid UAF for reorder_work	2025-03-13 12:46:52 +01:00
panic.c	panic: Flush kernel log buffer at the end	2024-04-13 12:59:40 +02:00
params.c	params: lift param_set_uint_minmax to common code	2024-06-16 13:32:26 +02:00
pid_namespace.c	zap_pid_ns_processes: clear TIF_NOTIFY_SIGNAL along with TIF_SIGPENDING	2024-07-05 09:12:33 +02:00
pid.c	kernel/pid.c: implement additional checks upon pidfd_create() parameters	2024-06-21 14:53:17 +02:00
profile.c	kernel: Initialize cpumask before parsing	2025-01-09 13:25:04 +01:00
ptrace.c
range.c
reboot.c	kernel/reboot: emergency_restart: Set correct system_state	2023-11-28 16:54:58 +00:00
regset.c
relay.c	relayfs: fix out-of-bounds access in relay_file_read	2023-05-17 11:47:34 +02:00
resource.c	resource: fix region_intersects() vs add_memory_driver_managed()	2024-10-17 15:08:36 +02:00
rseq.c
scftorture.c	scftorture: Forgive memory-allocation failure if KASAN	2023-09-23 11:01:05 +02:00
scs.c
seccomp.c	seccomp: Invalidate seccomp mode to catch death failures	2024-03-01 13:16:46 +01:00
signal.c	signal: Replace BUG_ON()s	2024-10-17 15:08:12 +02:00
smp.c	smp: Add missing destroy_work_on_stack() call in smp_call_on_cpu()	2024-09-12 11:06:48 +02:00
smpboot.c
smpboot.h
softirq.c
stackleak.c
stacktrace.c
static_call.c	x86/static-call: provide a way to do very early static-call updates	2024-12-19 18:06:13 +01:00
stop_machine.c
sys_ni.c	syscalls: fix compat_sys_io_pgetevents_time64 usage	2024-07-05 09:12:55 +02:00
sys.c	fs: add file and path permissions helpers	2024-06-21 14:52:58 +02:00
sysctl-test.c
sysctl.c	sysctl: introduce new proc handler proc_dobool	2024-06-21 14:53:18 +02:00
task_work.c	task_work: Introduce task_work_cancel() again	2024-08-19 05:40:57 +02:00
taskstats.c
test_kprobes.c
torture.c	torture: Fix hang during kthread shutdown phase	2023-08-30 16:23:17 +02:00
tracepoint.c
tsacct.c
ucount.c	fanotify: configurable limits via sysfs	2024-06-21 14:53:06 +02:00
uid16.c
uid16.h
umh.c
up.c
user_namespace.c
user-return-notifier.c
user.c
usermode_driver.c
utsname_sysctl.c
utsname.c
watch_queue.c	watch_queue: fix pipe accounting mismatch	2025-04-10 14:30:55 +02:00
watchdog_hld.c	watchdog/perf: properly initialize the turbo mode timestamp and rearm counter	2024-08-19 05:41:01 +02:00
watchdog.c	watchdog: move softlockup_panic back to early_param	2023-11-28 16:54:56 +00:00
workqueue_internal.h
workqueue.c	Revert "workqueue: remove unused cancel_work()"	2023-12-08 08:46:13 +01:00