Jinliang Zheng 79ad410c5b 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>		2024-07-11 12:49:15 +02:00
..
bpf	Revert "bpf: Take return from set_memory_ro() into account with bpf_prog_lock_ro()"	2024-07-09 11:44:29 +02:00
cgroup	sched/fair: Allow disabling sched_balance_newidle with sched_relax_domain_level	2024-06-12 11:12:13 +02:00
configs	Kbuild updates for v6.6	2023-09-05 11:01:47 -07:00
debug	kdb: Use format-specifiers rather than memset() for padding in kdb_read()	2024-06-16 13:47:44 +02:00
dma	swiotlb: extend buffer pre-padding to alloc_align_mask if necessary	2024-06-21 14:38:46 +02:00
entry	entry: Respect changes to system call number by trace_sys_enter()	2024-04-03 15:28:50 +02:00
events	perf/core: Fix missing wakeup when waiting for context reference	2024-06-21 14:38:39 +02:00
futex	futex: Don't include process MM in futex key on no-MMU	2023-11-20 11:58:53 +01:00
gcov	gcov: add support for GCC 14	2024-06-27 13:49:13 +02:00
irq	genirq/irqdesc: Prevent use-after-free in irq_find_at_or_after()	2024-06-16 13:47:46 +02:00
kcsan	kcsan: Don't expect 64 bits atomic builtins from 32 bits architectures	2023-06-09 23:29:50 +10:00
livepatch	livepatch: Fix missing newline character in klp_resolve_symbols()	2023-11-20 11:59:25 +01:00
locking	locking/mutex: Introduce devm_mutex_init()	2024-07-11 12:49:02 +02:00
module	modules: wait do_free_init correctly	2024-03-26 18:19:55 -04:00
power	PM: s2idle: Make sure CPUs will wakeup directly on resume	2024-04-17 11:19:26 +02:00
printk	printk: For @suppress_panic_printk check for other CPU in panic	2024-04-13 13:07:29 +02:00
rcu	rcutorture: Fix invalid context warning when enable srcu barrier testing	2024-06-27 13:49:01 +02:00
sched	sched/core: Fix incorrect initialization of the 'burst' parameter in cpu_max_write()	2024-06-12 11:12:13 +02:00
time	tick/nohz_full: Don't abuse smp_call_function_single() in tick_setup_device()	2024-06-21 14:38:46 +02:00
trace	tracing: Add MODULE_DESCRIPTION() to preemptirq_delay_test	2024-06-27 13:49:14 +02:00
.gitignore	…
Kconfig.freezer	…
Kconfig.hz	…
Kconfig.kexec	kexec: select CRYPTO from KEXEC_FILE instead of depending on it	2024-01-05 15:19:41 +01:00
Kconfig.locks	…
Kconfig.preempt	…
Makefile	kernel/numa.c: Move logging out of numa.h	2024-06-12 11:11:50 +02:00
acct.c	audit/stable-6.6 PR 20230829	2023-08-30 08:17:35 -07:00
async.c	async: Introduce async_schedule_dev_nocall()	2024-01-31 16:18:49 -08:00
audit.c	audit: Send netlink ACK before setting connection in auditd_set	2024-02-05 20:14:14 +00:00
audit.h	audit: correct audit_filter_inodes() definition	2023-07-21 12:17:25 -04:00
audit_fsnotify.c	…
audit_tree.c	…
audit_watch.c	audit: don't WARN_ON_ONCE(!current->mm) in audit_exe_compare()	2023-11-28 17:19:56 +00:00
auditfilter.c	audit: move trailing statements to next line	2023-08-15 18:16:14 -04:00
auditsc.c	audit,io_uring: io_uring openat triggers audit reference count underflow	2023-10-13 18:34:46 +02:00
backtracetest.c	…
bounds.c	bounds: Use the right number of bits for power-of-two CONFIG_NR_CPUS	2024-05-02 16:32:50 +02:00
capability.c	lsm: constify the 'target' parameter in security_capget()	2023-08-08 16:48:47 -04:00
cfi.c	…
compat.c	…
configs.c	…
context_tracking.c	locking/atomic: treewide: use raw_atomic*_<op>()	2023-06-05 09:57:20 +02:00
cpu.c	cpu: Fix broken cmdline "nosmp" and "maxcpus=0"	2024-07-11 12:49:14 +02:00
cpu_pm.c	…
crash_core.c	mm: turn folio_test_hugetlb into a PageType	2024-05-02 16:32:47 +02:00
crash_dump.c	…
cred.c	cred: get rid of CONFIG_DEBUG_CREDENTIALS	2023-12-20 17:01:51 +01:00
delayacct.c	delayacct: track delays from IRQ/SOFTIRQ	2023-04-18 16:39:34 -07:00
dma.c	…
exec_domain.c	…
exit.c	mm: optimize the redundant loop of mm_update_owner_next()	2024-07-11 12:49:15 +02:00
extable.c	…
fail_function.c	…
fork.c	Revert "fork: defer linking file vma until vma is fully initialized"	2024-06-21 14:38:47 +02:00
freezer.c	…
gen_kheaders.sh	kheaders: explicitly define file modes for archived headers	2024-06-21 14:38:40 +02:00
groups.c	…
hung_task.c	…
iomem.c	kernel/iomem.c: remove __weak ioremap_cache helper	2023-08-21 13:37:28 -07:00
irq_work.c	…
jump_label.c	…
kallsyms.c	kallsyms: Change func signature for cleanup_symbol_name()	2023-08-25 15:00:36 -07:00
kallsyms_internal.h	…
kallsyms_selftest.c	Modules changes for v6.6-rc1	2023-08-29 17:32:32 -07:00
kallsyms_selftest.h	…
kcmp.c	…
kcov.c	kcov: don't lose track of remote references during softirqs	2024-06-27 13:49:13 +02:00
kexec.c	kernel: kexec: copy user-array safely	2023-11-28 17:19:40 +00:00
kexec_core.c	kexec: do syscore_shutdown() in kernel_kexec	2024-01-31 16:18:56 -08:00
kexec_elf.c	…
kexec_file.c	integrity-v6.6	2023-08-30 09:16:56 -07:00
kexec_internal.h	…
kheaders.c	…
kprobes.c	kprobe/ftrace: fix build error due to bad function definition	2024-06-27 13:49:15 +02:00
ksyms_common.c	kallsyms: make kallsyms_show_value() as generic function	2023-06-08 12:27:20 -07:00
ksysfs.c	crash: hotplug support for kexec_load()	2023-08-24 16:25:14 -07:00
kthread.c	kthread: add kthread_stop_put	2024-06-12 11:12:52 +02:00
latencytop.c	…
module_signature.c	…
notifier.c	…
nsproxy.c	nsproxy: Convert nsproxy.count to refcount_t	2023-08-21 11:29:12 -07:00
numa.c	kernel/numa.c: Move logging out of numa.h	2024-06-12 11:11:50 +02:00
padata.c	padata: Disable BH when taking works lock on MT path	2024-06-27 13:49:00 +02:00
panic.c	panic: Flush kernel log buffer at the end	2024-04-13 13:07:29 +02:00
params.c	kernel: params: Remove unnecessary ‘0’ values from err	2023-07-10 12:47:01 -07:00
pid.c	pidfd: prevent a kernel-doc warning	2023-09-19 13:21:33 -07:00
pid_namespace.c	zap_pid_ns_processes: clear TIF_NOTIFY_SIGNAL along with TIF_SIGPENDING	2024-06-21 14:38:50 +02:00
pid_sysctl.h	memfd: replace ratcheting feature from vm.memfd_noexec with hierarchy	2023-08-21 13:37:59 -07:00
profile.c	…
ptrace.c	ptrace: Provide set/get interface for syscall user dispatch	2023-04-16 14:23:07 +02:00
range.c	…
reboot.c	kernel/reboot: emergency_restart: Set correct system_state	2023-11-28 17:20:04 +00:00
regset.c	…
relay.c	kernel: relay: remove unnecessary NULL values from relay_open_buf	2023-08-18 10:18:55 -07:00
resource.c	kernel/resource: Increment by align value in get_free_mem_region()	2024-01-10 17:16:58 +01:00
resource_kunit.c	…
rseq.c	…
scftorture.c	scftorture: Pause testing after memory-allocation failure	2023-07-14 15:02:57 -07:00
scs.c	…
seccomp.c	seccomp: Add missing kerndoc notations	2023-08-17 12:32:15 -07:00
signal.c	signal: print comm and exe name on fatal signals	2023-08-18 10:18:50 -07:00
smp.c	smp,csd: Throw an error if a CSD lock is stuck for too long	2023-11-28 17:19:36 +00:00
smpboot.c	kthread: add kthread_stop_put	2024-06-12 11:12:52 +02:00
smpboot.h	…
softirq.c	softirq: Fix suspicious RCU usage in __do_softirq()	2024-06-12 11:11:27 +02:00
stackleak.c	stackleak: allow to specify arch specific stackleak poison function	2023-04-20 11:36:35 +02:00
stacktrace.c	…
static_call.c	…
static_call_inline.c	…
stop_machine.c	…
sys.c	prctl: generalize PR_SET_MDWE support check to be per-arch	2024-04-03 15:28:54 +02:00
sys_ni.c	syscalls: fix compat_sys_io_pgetevents_time64 usage	2024-07-05 09:34:04 +02:00
sysctl-test.c	…
sysctl.c	v6.5-rc1-sysctl-next	2023-06-28 16:05:21 -07:00
task_work.c	task_work: add kerneldoc annotation for 'data' argument	2023-09-19 13:21:32 -07:00
taskstats.c	…
torture.c	rcutorture: Fix stuttering races and other issues	2023-11-28 17:20:08 +00:00
tracepoint.c	…
tsacct.c	…
ucount.c	sysctl: Add size to register_sysctl	2023-08-15 15:26:17 -07:00
uid16.c	…
uid16.h	…
umh.c	sysctl: fix unused proc_cap_handler() function warning	2023-06-29 15:19:43 -07:00
up.c	…
user-return-notifier.c	…
user.c	…
user_namespace.c	…
usermode_driver.c	…
utsname.c	…
utsname_sysctl.c	…
vhost_task.c	vhost_task: Handle SIGKILL by flushing work and exiting	2024-07-11 12:49:10 +02:00
watch_queue.c	kernel: watch_queue: copy user-array safely	2023-11-28 17:19:40 +00:00
watchdog.c	watchdog: move softlockup_panic back to early_param	2023-11-28 17:19:57 +00:00
watchdog_buddy.c	watchdog/hardlockup: move SMP barriers from common code to buddy code	2023-06-19 16:25:28 -07:00
watchdog_perf.c	watchdog/perf: add a weak function for an arch to detect if perf can use NMIs	2023-06-09 17:44:21 -07:00
workqueue.c	workqueue: Fix selection of wake_cpu in kick_pool()	2024-05-17 12:02:31 +02:00
workqueue_internal.h	workqueue: Drop the special locking rule for worker->flags and worker_pool->flags	2023-08-07 15:57:22 -10:00