Zheng Yejian e3ad85c477 tracing: Avoid possible softlockup in tracing_iter_reset() ... commit 49aa8a1f4d6800721c7971ed383078257f12e8f9 upstream. In __tracing_open(), when max latency tracers took place on the cpu, the time start of its buffer would be updated, then event entries with timestamps being earlier than start of the buffer would be skipped (see tracing_iter_reset()). Softlockup will occur if the kernel is non-preemptible and too many entries were skipped in the loop that reset every cpu buffer, so add cond_resched() to avoid it. Cc: stable@vger.kernel.org Fixes: 2f26ebd549 ("tracing: use timestamp to determine start of latency traces") Link: https://lore.kernel.org/20240827124654.3817443-1-zhengyejian@huaweicloud.com Suggested-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Zheng Yejian <zhengyejian@huaweicloud.com> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2024-09-12 11:06:43 +02:00
..
bpf	bpf: Eliminate remaining "make W=1" warnings in kernel/bpf/btf.o	2024-08-19 05:40:48 +02:00
cgroup	bpf, cgroup: Assign cgroup in cgroup_sk_alloc when called from interrupt	2024-09-12 11:06:42 +02:00
configs
debug	kdb: Use the passed prompt in kdb_position_cursor()	2024-08-19 05:41:03 +02:00
dma	dma-debug: avoid deadlock between dma debug vs printk and netconsole	2024-09-12 11:06:39 +02:00
entry	entry/kvm: Exit to user mode when TIF_NOTIFY_SIGNAL is set	2023-01-04 11:39:22 +01:00
events	perf: Prevent passing zero nr_pages to rb_alloc_aux()	2024-08-19 05:40:46 +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/irqdesc: Honor caller provided affinity in alloc_desc()	2024-08-19 05:41:19 +02:00
kcsan	kcsan: Don't expect 64 bits atomic builtins from 32 bits architectures	2023-07-27 08:43:57 +02:00
livepatch	kallsyms: refactor {,module_}kallsyms_on_each_symbol	2024-06-21 14:52:58 +02:00
locking	lockdep: Fix block chain corruption	2023-12-08 08:46:09 +01:00
power	PM: suspend: Set mem_sleep_current during kernel command line setup	2024-04-13 12:58:13 +02:00
printk	printk: Update @console_may_schedule in console_trylock_spinning()	2024-04-13 12:58:54 +02:00
rcu	rcu-tasks: Fix show_rcu_tasks_trace_gp_kthread buffer overflow	2024-09-12 11:06:42 +02:00
sched	sched/cputime: Fix mul_u64_u64_div_u64() precision for cputime	2024-08-19 05:41:14 +02:00
time	hrtimer: Prevent queuing of hrtimer without a function callback	2024-09-04 13:17:39 +02:00
trace	tracing: Avoid possible softlockup in tracing_iter_reset()	2024-09-12 11:06:43 +02:00
.gitignore	kbuild: update config_data.gz only when the content of .config is changed	2021-05-11 14:47:37 +02:00
acct.c	acct: fix potential integer overflow in encode_comp_t()	2023-01-14 10:16:14 +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	audit: log AUDIT_TIME_* records only from rules	2022-04-08 14:40:00 +02:00
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	treewide: Replace DECLARE_TASKLET() with DECLARE_TASKLET_OLD()	2020-07-30 11:15:58 -07:00
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	LSM: Signal to SafeSetID when setting group IDs	2020-10-13 09:17:34 -07:00
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	context_tracking: Ensure that the critical path cannot be instrumented	2020-06-11 15:14:36 +02:00
cpu_pm.c	PM: cpu: Make notifier chain use a raw_spinlock_t	2021-09-15 09:50:40 +02:00
cpu.c	cpu: Re-enable CPU mitigations by default for !X86 architectures	2024-05-02 16:23:44 +02:00
crash_core.c	crash_core, vmcoreinfo: append 'SECTION_SIZE_BITS' to vmcoreinfo	2021-06-23 14:42:52 +02:00
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	Revert "kernel: freezer should treat PF_IO_WORKER like PF_KTHREAD for freezing"	2021-04-07 15:00:14 +02:00
gen_kheaders.sh	kheaders: explicitly define file modes for archived headers	2024-07-05 09:12:44 +02:00
groups.c	LSM: Signal to SafeSetID when setting group IDs	2020-10-13 09:17:34 -07:00
hung_task.c	kernel/hung_task.c: make type annotations consistent	2020-11-02 12:14:19 -08:00
iomem.c
irq_work.c	irq_work, smp: Allow irq_work on call_single_queue	2020-05-28 10:54:15 +02:00
jump_label.c	jump_label: Fix jump_label_text_reserved() vs __init	2021-07-20 16:05:58 +02:00
kallsyms.c	kallsyms: only build {,module_}kallsyms_on_each_symbol when required	2024-06-21 14:52:58 +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_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	kmod: remove redundant "be an" in the comment	2020-08-12 10:58:01 -07:00
kprobes.c	kprobes: Fix to check symbol prefixes correctly	2024-08-19 05:41:17 +02:00
ksysfs.c	kexec: turn all kexec_mutex acquisitions into trylocks	2023-04-20 12:10:29 +02:00
kthread.c	exit: Implement kthread_exit	2024-06-21 14:53:28 +02:00
latencytop.c
Makefile	futex: Move to kernel/futex/	2023-01-14 10:15:20 +01:00
module_signature.c	module: harden ELF info handling	2021-03-25 09:04:11 +01:00
module_signing.c	module: harden ELF info handling	2021-03-25 09:04:11 +01:00
module-internal.h
module.c	NFSD: Remove svc_serv_ops::svo_module	2024-06-21 14:53:37 +02:00
notifier.c	notifier: Fix broken error handling pattern	2020-09-01 09:58:03 +02:00
nsproxy.c	nsproxy: support CLONE_NEWTIME with setns()	2020-07-08 11:14:22 +02:00
padata.c	padata: Fix possible divide-by-0 panic in padata_mt_helper()	2024-08-19 05:41:20 +02:00
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	profiling: fix shift too large makes kernel panic	2022-08-21 15:16:05 +02:00
ptrace.c	ptrace: Reimplement PTRACE_KILL by always sending SIGKILL	2022-06-09 10:20:49 +02:00
range.c	kernel.h: split out min()/max() et al. helpers	2020-10-16 11:11:19 -07:00
reboot.c	kernel/reboot: emergency_restart: Set correct system_state	2023-11-28 16:54:58 +00:00
regset.c	regset: kill ->get()	2020-07-27 14:31:12 -04:00
relay.c	relayfs: fix out-of-bounds access in relay_file_read	2023-05-17 11:47:34 +02:00
resource.c	dax/kmem: Fix leak of memory-hotplug resources	2023-03-11 16:40:04 +01:00
rseq.c	rseq: Remove broken uapi field layout on 32-bit little endian	2022-04-08 14:40:03 +02:00
scftorture.c	scftorture: Forgive memory-allocation failure if KASAN	2023-09-23 11:01:05 +02:00
scs.c	mm: memcontrol: account kernel stack per node	2020-08-07 11:33:25 -07:00
seccomp.c	seccomp: Invalidate seccomp mode to catch death failures	2024-03-01 13:16:46 +01:00
signal.c	kernel: rerun task_work while freezing in get_signal()	2024-08-19 05:41:03 +02:00
smp.c	smp: Fix offline cpu check in flush_smp_call_function_queue()	2022-04-20 09:23:29 +02:00
smpboot.c	sched/core: Initialize the idle task with preemption disabled	2021-07-14 16:55:50 +02:00
smpboot.h
softirq.c	softirq: Add debug check to __raise_softirq_irqoff()	2020-09-16 15:18:56 +02:00
stackleak.c	gcc-plugins/stackleak: Use noinstr in favor of notrace	2022-02-23 12:01:00 +01:00
stacktrace.c	stacktrace: Remove reliable argument from arch_stack_walk() callback	2020-09-18 14:24:16 +01:00
static_call.c	static_call: Fix unused variable warn w/o MODULE	2021-09-08 08:49:00 +02:00
stop_machine.c	stop_machine, rcu: Mark functions as notrace	2020-10-26 12:12:27 +01:00
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	taskstats: move specifying netlink policy back to ops	2020-10-02 19:11:12 -07:00
test_kprobes.c
torture.c	torture: Fix hang during kthread shutdown phase	2023-08-30 16:23:17 +02:00
tracepoint.c	tracepoint: Use rcu get state and cond sync for static call updates	2021-09-03 10:09:30 +02:00
tsacct.c	taskstats: Cleanup the use of task->exit_code	2022-01-27 10:54:33 +01:00
ucount.c	fanotify: configurable limits via sysfs	2024-06-21 14:53:06 +02:00
uid16.c
uid16.h
umh.c	usermodehelper: reset umask to default before executing user process	2020-10-06 10:31:52 -07:00
up.c	smp: Fix smp_call_function_single_async prototype	2021-05-14 09:50:46 +02:00
user_namespace.c	Revert "Add a reference to ucounts for each cred"	2021-09-08 08:49:00 +02:00
user-return-notifier.c
user.c	user.c: make uidhash_table static	2020-06-04 19:06:24 -07:00
usermode_driver.c	bpf: Fix umd memory leak in copy_process()	2021-03-30 14:32:03 +02:00
utsname_sysctl.c
utsname.c
watch_queue.c	watch_queue: fix IOC_WATCH_QUEUE_SET_SIZE alloc error paths	2023-03-17 08:45:13 +01:00
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