Jinliang Zheng df13f3cb4a mm: optimize the redundant loop of mm_update_owner_next() ... commit cf3f9a593dab87a032d2b6a6fb205e7f3de4f0a1 upstream. When mm_update_owner_next() is racing with swapoff (try_to_unuse()) or /proc or ptrace or page migration (get_task_mm()), it is impossible to find an appropriate task_struct in the loop whose mm_struct is the same as the target mm_struct. If the above race condition is combined with the stress-ng-zombie and stress-ng-dup tests, such a long loop can easily cause a Hard Lockup in write_lock_irq() for tasklist_lock. Recognize this situation in advance and exit early. Link: https://lkml.kernel.org/r/20240620122123.3877432-1-alexjlzheng@tencent.com Signed-off-by: Jinliang Zheng <alexjlzheng@tencent.com> Acked-by: Michal Hocko <mhocko@suse.com> Cc: Christian Brauner <brauner@kernel.org> Cc: Jens Axboe <axboe@kernel.dk> Cc: Mateusz Guzik <mjguzik@gmail.com> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Tycho Andersen <tandersen@netflix.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2024-07-18 13:07:32 +02:00
..
bpf	bpf: Take return from set_memory_ro() into account with bpf_prog_lock_ro()	2024-07-05 09:14:42 +02:00
cgroup	sched/fair: Allow disabling sched_balance_newidle with sched_relax_domain_level	2024-06-16 13:39:34 +02:00
configs	…
debug	kdb: Use format-specifiers rather than memset() for padding in kdb_read()	2024-06-16 13:39:59 +02:00
dma	cma: factor out minimum alignment requirement	2024-07-05 09:14:13 +02:00
entry	entry: Respect changes to system call number by trace_sys_enter()	2024-04-10 16:18:46 +02:00
events	perf/core: Fix missing wakeup when waiting for context reference	2024-07-05 09:14:38 +02:00
futex	futex: Don't include process MM in futex key on no-MMU	2023-11-20 11:08:13 +01:00
gcov	gcov: add support for GCC 14	2024-07-05 09:14:34 +02:00
irq	genirq/cpuhotplug, x86/vector: Prevent vector leak during CPU offline	2024-06-16 13:39:52 +02:00
kcsan	kcsan: Don't expect 64 bits atomic builtins from 32 bits architectures	2023-07-23 13:47:12 +02:00
livepatch	livepatch: Fix missing newline character in klp_resolve_symbols()	2023-11-20 11:08:25 +01:00
locking	locking/mutex: Introduce devm_mutex_init()	2024-07-18 13:07:26 +02:00
power	PM: suspend: Set mem_sleep_current during kernel command line setup	2024-04-10 16:18:36 +02:00
printk	printk: Update @console_may_schedule in console_trylock_spinning()	2024-04-10 16:18:47 +02:00
rcu	rcutorture: Fix invalid context warning when enable srcu barrier testing	2024-07-05 09:14:25 +02:00
sched	sched/core: Fix incorrect initialization of the 'burst' parameter in cpu_max_write()	2024-06-16 13:39:34 +02:00
time	tick/nohz_full: Don't abuse smp_call_function_single() in tick_setup_device()	2024-07-05 09:14:22 +02:00
trace	tracing: Add MODULE_DESCRIPTION() to preemptirq_delay_test	2024-07-05 09:14:36 +02:00
.gitignore	…
Kconfig.freezer	…
Kconfig.hz	…
Kconfig.locks	locking/rwlock: Provide RT variant	2021-08-17 17:50:51 +02:00
Kconfig.preempt	sched/core: Disable CONFIG_SCHED_CORE by default	2021-06-28 22:43:05 +02:00
Makefile	futex: Move to kernel/futex/	2022-12-31 13:14:04 +01:00
acct.c	acct: fix potential integer overflow in encode_comp_t()	2022-12-31 13:14:40 +01:00
async.c	async: Introduce async_schedule_dev_nocall()	2024-02-23 08:54:25 +01:00
audit.c	audit: Send netlink ACK before setting connection in auditd_set	2024-02-23 08:54:37 +01:00
audit.h	audit: log AUDIT_TIME_* records only from rules	2022-04-08 14:23:06 +02:00
audit_fsnotify.c	fsnotify: make allow_dups a property of the group	2024-04-10 16:19:02 +02:00
audit_tree.c	fsnotify: pass flags argument to fsnotify_alloc_group()	2024-04-10 16:19:02 +02:00
audit_watch.c	fsnotify: pass flags argument to fsnotify_alloc_group()	2024-04-10 16:19:02 +02:00
auditfilter.c	…
auditsc.c	audit: fix possible soft lockup in __audit_inode_child()	2023-09-19 12:22:39 +02:00
backtracetest.c	…
bounds.c	bounds: Use the right number of bits for power-of-two CONFIG_NR_CPUS	2024-05-02 16:24:50 +02:00
capability.c	…
cfi.c	cfi: Fix __cfi_slowpath_diag RCU usage with cpuidle	2022-06-22 14:22:04 +02:00
compat.c	sched_getaffinity: don't assume 'cpumask_size()' is fully initialized	2023-04-05 11:24:53 +02:00
configs.c	…
context_tracking.c	…
cpu.c	cpu/hotplug: Fix dynstate assignment in __cpuhp_setup_state_cpuslocked()	2024-07-05 09:14:48 +02:00
cpu_pm.c	PM: cpu: Make notifier chain use a raw_spinlock_t	2021-08-16 18:55:32 +02:00
crash_core.c	kernel/crash_core: suppress unknown crashkernel parameter warning	2021-12-29 12:28:49 +01:00
crash_dump.c	…
cred.c	cred: switch to using atomic_long_t	2023-12-20 15:17:37 +01:00
delayacct.c	…
dma.c	…
exec_domain.c	…
exit.c	mm: optimize the redundant loop of mm_update_owner_next()	2024-07-18 13:07:32 +02:00
extable.c	…
fail_function.c	kernel/fail_function: fix memory leak with using debugfs_lookup()	2023-03-11 13:57:38 +01:00
fork.c	kernel/fork: beware of __put_task_struct() calling context	2023-09-23 11:09:55 +02:00
freezer.c	…
gen_kheaders.sh	kheaders: explicitly define file modes for archived headers	2024-07-05 09:14:37 +02:00
groups.c	…
hung_task.c	Merge branch 'akpm' (patches from Andrew)	2021-07-02 12:08:10 -07:00
iomem.c	…
irq_work.c	…
jump_label.c	jump_label: Fix jump_label_text_reserved() vs __init	2021-07-05 10:46:20 +02:00
kallsyms.c	kallsyms: Make kallsyms_on_each_symbol generally available	2023-12-13 18:36:45 +01:00
kcmp.c	…
kcov.c	kcov: don't lose track of remote references during softirqs	2024-07-05 09:14:34 +02:00
kexec.c	kernel: kexec: copy user-array safely	2023-11-28 16:56:16 +00:00
kexec_core.c	kexec: fix a memory leak in crash_shrink_memory()	2023-07-23 13:46:52 +02:00
kexec_elf.c	…
kexec_file.c	kexec: support purgatories with .text.hot sections	2023-06-21 15:59:14 +02:00
kexec_internal.h	panic, kexec: make __crash_kexec() NMI safe	2023-04-20 12:13:57 +02:00
kheaders.c	kheaders: Use array declaration instead of char	2023-05-11 23:00:17 +09:00
kmod.c	…
kprobes.c	x86/ibt,ftrace: Search for __fentry__ location	2024-07-05 09:14:12 +02:00
ksysfs.c	kexec: turn all kexec_mutex acquisitions into trylocks	2023-04-20 12:13:57 +02:00
kthread.c	exit: Implement kthread_exit	2024-04-10 16:18:55 +02:00
latencytop.c	…
module-internal.h	…
module.c	NFSD: Remove svc_serv_ops::svo_module	2024-04-10 16:19:01 +02:00
module_signature.c	…
module_signing.c	…
notifier.c	notifier: Remove atomic_notifier_call_chain_robust()	2021-08-16 18:55:32 +02:00
nsproxy.c	memcg: enable accounting for new namesapces and struct nsproxy	2021-09-03 09:58:12 -07:00
padata.c	padata: Disable BH when taking works lock on MT path	2024-07-05 09:14:24 +02:00
panic.c	panic: Flush kernel log buffer at the end	2024-04-13 13:01:43 +02:00
params.c	params: lift param_set_uint_minmax to common code	2021-08-16 14:42:22 +02:00
pid.c	kernel/pid.c: implement additional checks upon pidfd_create() parameters	2021-08-10 12:53:07 +02:00
pid_namespace.c	zap_pid_ns_processes: clear TIF_NOTIFY_SIGNAL along with TIF_SIGPENDING	2024-07-05 09:14:24 +02:00
profile.c	profiling: fix shift too large makes kernel panic	2022-08-17 14:24:04 +02:00
ptrace.c	ptrace: Reimplement PTRACE_KILL by always sending SIGKILL	2022-06-09 10:22:29 +02:00
range.c	…
reboot.c	kernel/reboot: emergency_restart: Set correct system_state	2023-11-28 16:56:31 +00:00
regset.c	…
relay.c	relayfs: fix out-of-bounds access in relay_file_read	2023-05-11 23:00:18 +09:00
resource.c	dax/kmem: Fix leak of memory-hotplug resources	2023-03-10 09:40:08 +01:00
resource_kunit.c	…
rseq.c	rseq: Remove broken uapi field layout on 32-bit little endian	2022-04-08 14:23:10 +02:00
scftorture.c	scftorture: Forgive memory-allocation failure if KASAN	2023-09-23 11:09:55 +02:00
scs.c	scs: Release kasan vmalloc poison in scs_free process	2021-11-18 19:16:29 +01:00
seccomp.c	seccomp: Invalidate seccomp mode to catch death failures	2022-02-16 12:56:38 +01:00
signal.c	signal handling: don't use BUG_ON() for debugging	2022-07-21 21:24:42 +02:00
smp.c	locking/csd_lock: Change csdlock_debug from early_param to __setup	2022-08-17 14:24:24 +02:00
smpboot.c	smpboot: Replace deprecated CPU-hotplug functions.	2021-08-10 14:57:42 +02:00
smpboot.h	…
softirq.c	softirq: Fix suspicious RCU usage in __do_softirq()	2024-06-16 13:39:15 +02:00
stackleak.c	gcc-plugins/stackleak: Use noinstr in favor of notrace	2022-02-23 12:03:07 +01:00
stacktrace.c	stacktrace: move filter_irq_stacks() to kernel/stacktrace.c	2022-04-13 20:59:28 +02:00
static_call.c	static_call: Don't make __static_call_return0 static	2022-04-13 20:59:28 +02:00
static_call_inline.c	static_call: Don't make __static_call_return0 static	2022-04-13 20:59:28 +02:00
stop_machine.c	…
sys.c	getrusage: use sig->stats_lock rather than lock_task_sighand()	2024-03-15 10:48:22 -04:00
sys_ni.c	syscalls: fix compat_sys_io_pgetevents_time64 usage	2024-07-05 09:14:50 +02:00
sysctl-test.c	…
sysctl.c	sched/rt: Disallow writing invalid values to sched_rt_period_us	2024-03-01 13:21:43 +01:00
task_work.c	…
taskstats.c	…
test_kprobes.c	…
torture.c	torture: Fix hang during kthread shutdown phase	2023-08-30 16:18:19 +02:00
tracepoint.c	tracepoint: Fix kerneldoc comments	2021-08-16 11:39:51 -04:00
tsacct.c	taskstats: Cleanup the use of task->exit_code	2022-01-27 11:05:35 +01:00
ucount.c	ucounts: Handle wrapping in is_ucounts_overlimit	2022-02-23 12:03:20 +01:00
uid16.c	…
uid16.h	…
umh.c	…
up.c	…
user-return-notifier.c	…
user.c	fs/epoll: use a per-cpu counter for user's watches count	2021-09-08 11:50:27 -07:00
user_namespace.c	ucounts: Fix systemd LimitNPROC with private users regression	2022-03-08 19:12:42 +01:00
usermode_driver.c	Merge branch 'work.namei' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2021-07-03 11:41:14 -07:00
utsname.c	…
utsname_sysctl.c	…
watch_queue.c	kernel: watch_queue: copy user-array safely	2023-11-28 16:56:16 +00:00
watchdog.c	watchdog: move softlockup_panic back to early_param	2023-11-28 16:56:28 +00:00
watchdog_hld.c	watchdog/perf: more properly prevent false positives with turbo modes	2023-07-23 13:46:52 +02:00
workqueue.c	Revert "workqueue: remove unused cancel_work()"	2023-12-08 08:48:03 +01:00
workqueue_internal.h	workqueue: Assign a color to barrier work items	2021-08-17 07:49:10 -10:00