Paul E. McKenney 46faf9d8e1 rcu-tasks: Initialize data to eliminate RCU-tasks/do_exit() deadlocks ... Holding a mutex across synchronize_rcu_tasks() and acquiring that same mutex in code called from do_exit() after its call to exit_tasks_rcu_start() but before its call to exit_tasks_rcu_stop() results in deadlock. This is by design, because tasks that are far enough into do_exit() are no longer present on the tasks list, making it a bit difficult for RCU Tasks to find them, let alone wait on them to do a voluntary context switch. However, such deadlocks are becoming more frequent. In addition, lockdep currently does not detect such deadlocks and they can be difficult to reproduce. In addition, if a task voluntarily context switches during that time (for example, if it blocks acquiring a mutex), then this task is in an RCU Tasks quiescent state. And with some adjustments, RCU Tasks could just as well take advantage of that fact. This commit therefore initializes the data structures that will be needed to rely on these quiescent states and to eliminate these deadlocks. Link: https://lore.kernel.org/all/20240118021842.290665-1-chenzhongjin@huawei.com/ Reported-by: Chen Zhongjin <chenzhongjin@huawei.com> Reported-by: Yang Jihong <yangjihong1@huawei.com> Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Tested-by: Yang Jihong <yangjihong1@huawei.com> Tested-by: Chen Zhongjin <chenzhongjin@huawei.com> Reviewed-by: Frederic Weisbecker <frederic@kernel.org> Signed-off-by: Boqun Feng <boqun.feng@gmail.com>		2024-02-25 14:21:43 -08:00
..
bpf	bpf: enforce types for __arg_ctx-tagged arguments in global subprogs	2024-01-17 20:20:06 -08:00
cgroup	Driver core changes for 6.8-rc1	2024-01-18 09:48:40 -08:00
configs	hardening: Provide Kconfig fragments for basic options	2023-09-22 09:50:55 -07:00
debug	kdb: Fix a potential buffer overflow in kdb_local()	2024-01-17 17:19:06 +00:00
dma	dma-mapping fixes for Linux 6.8	2024-01-18 16:49:34 -08:00
entry	entry: Move syscall_enter_from_user_mode() to header file	2023-12-21 23:12:18 +01:00
events	Many singleton patches against the MM code. The patch series which	2024-01-09 11:18:47 -08:00
futex	futex: Prevent the reuse of stale pi_state	2024-01-19 12:58:17 +01:00
gcov	gcov: annotate struct gcov_iterator with __counted_by	2023-10-18 14:43:22 -07:00
irq	genirq: Initialize resend_node hlist for all interrupt descriptors	2024-01-24 14:15:41 +01:00
kcsan	mm: delete checks for xor_unlock_is_negative_byte()	2023-10-18 14:34:17 -07:00
livepatch	livepatch: Fix missing newline character in klp_resolve_symbols()	2023-09-20 11:24:18 +02:00
locking	RCU pull request for v6.8	2024-01-12 16:35:58 -08:00
module	Modules changes for v6.8-rc1	2024-01-10 18:00:18 -08:00
power	PM: hibernate: Repair excess function parameter description warning	2023-12-20 19:19:26 +01:00
printk	TTY/Serial changes for 6.7-rc1	2023-11-03 15:44:25 -10:00
rcu	rcu-tasks: Initialize data to eliminate RCU-tasks/do_exit() deadlocks	2024-02-25 14:21:43 -08:00
sched	Fix a cpufreq related performance regression on certain systems,	2024-01-18 11:57:33 -08:00
time	tick/sched: Preserve number of idle sleeps across CPU hotplug events	2024-01-25 09:52:40 +01:00
trace	tracing: Ensure visibility when inserting an element into tracing_map	2024-01-22 17:15:40 -05:00
.gitignore
acct.c	fs: rename __mnt_{want,drop}_write*() helpers	2023-09-11 15:05:50 +02:00
async.c	header cleanups for 6.8	2024-01-10 16:43:55 -08:00
audit.c	audit: Send netlink ACK before setting connection in auditd_set	2023-11-12 22:33:49 -05:00
audit.h	audit: correct audit_filter_inodes() definition	2023-07-21 12:17:25 -04:00
audit_fsnotify.c
audit_tree.c	As usual, lots of singleton and doubleton patches all over the tree and	2023-11-02 20:53:31 -10:00
audit_watch.c	audit: don't WARN_ON_ONCE(!current->mm) in audit_exe_compare()	2023-11-14 17:34:27 -05:00
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
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
cpu.c	slab updates for 6.8	2024-01-09 10:36:07 -08:00
cpu_pm.c
crash_core.c	kernel/crash_core.c: make __crash_hotplug_lock static	2024-01-12 15:20:47 -08:00
crash_dump.c
cred.c	cred: get rid of CONFIG_DEBUG_CREDENTIALS	2023-12-15 14:19:48 -08:00
delayacct.c
dma.c
exec_domain.c
exit.c	header cleanups for 6.8	2024-01-10 16:43:55 -08:00
exit.h	exit: add internal include file with helpers	2023-09-21 12:03:50 -06:00
extable.c
fail_function.c
fork.c	rcu-tasks: Initialize data to eliminate RCU-tasks/do_exit() deadlocks	2024-02-25 14:21:43 -08:00
freezer.c	Linux 6.7-rc6	2023-12-23 15:52:13 +01:00
gen_kheaders.sh
groups.c	groups: Convert group_info.usage to refcount_t	2023-09-29 11:28:39 -07:00
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	file: convert to SLAB_TYPESAFE_BY_RCU	2023-10-19 11:02:48 +02:00
Kconfig.freezer
Kconfig.hz
Kconfig.kexec	kexec: select CRYPTO from KEXEC_FILE instead of depending on it	2023-12-20 13:46:19 -08:00
Kconfig.locks
Kconfig.preempt
kcov.c
kexec.c	kernel: kexec: copy user-array safely	2023-10-09 16:59:47 +10:00
kexec_core.c	kexec: do syscore_shutdown() in kernel_kexec	2024-01-12 15:20:47 -08:00
kexec_elf.c
kexec_file.c	kexec_file: fix incorrect temp_start value in locate_mem_hole_top_down()	2023-12-29 12:22:25 -08:00
kexec_internal.h
kheaders.c
kprobes.c	kprobes: consistent rcu api usage for kretprobe holder	2023-12-01 14:53:55 +09:00
ksyms_common.c
ksysfs.c	crash: hotplug support for kexec_load()	2023-08-24 16:25:14 -07:00
kthread.c	As usual, lots of singleton and doubleton patches all over the tree and	2023-11-02 20:53:31 -10:00
latencytop.c
Makefile	kernel/numa.c: Move logging out of numa.h	2023-12-20 19:26:30 -05:00
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	2023-12-20 19:26:30 -05:00
padata.c	padata: Fix refcnt handling in padata_free_shell()	2023-10-27 18:04:24 +08:00
panic.c	panic: use atomic_try_cmpxchg in panic() and nmi_panic()	2023-10-04 10:41:56 -07:00
params.c	params: Fix multi-line comment style	2023-12-01 09:51:44 -08:00
pid.c	file: remove __receive_fd()	2023-12-12 14:24:14 +01:00
pid_namespace.c	wait: Remove uapi header file from main header file	2023-12-20 19:26:31 -05:00
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	Quite a lot of kexec work this time around. Many singleton patches in	2024-01-09 11:46:20 -08:00
range.c
reboot.c	Thermal control updates for 6.8-rc1	2024-01-09 16:20:17 -08:00
regset.c
relay.c	kernel: relay: remove relay_file_splice_read dead code, doesn't work	2023-12-29 12:22:27 -08:00
resource.c	Quite a lot of kexec work this time around. Many singleton patches in	2024-01-09 11:46:20 -08:00
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	file: remove __receive_fd()	2023-12-12 14:24:14 +01:00
signal.c	kernel/signal.c: simplify force_sig_info_to_task(), kill recalc_sigpending_and_wake()	2023-12-10 17:21:32 -08:00
smp.c	CSD lock commits for v6.7	2023-10-30 17:56:53 -10:00
smpboot.c	kthread: add kthread_stop_put	2023-10-04 10:41:57 -07:00
smpboot.h
softirq.c	sched/core: introduce sched_core_idle_cpu()	2023-07-13 15:21:50 +02:00
stackleak.c
stacktrace.c	stacktrace: fix kernel-doc typo	2023-12-29 12:22:29 -08:00
static_call.c
static_call_inline.c
stop_machine.c
sys.c	prctl: Disable prctl(PR_SET_MDWE) on parisc	2023-11-18 19:35:31 +01:00
sys_ni.c	lsm/stable-6.8 PR 20240105	2024-01-09 12:57:46 -08:00
sysctl-test.c
sysctl.c	asm-generic updates for v6.7	2023-11-01 15:28:33 -10:00
task_work.c	task_work: add kerneldoc annotation for 'data' argument	2023-09-19 13:21:32 -07:00
taskstats.c	taskstats: fill_stats_for_tgid: use for_each_thread()	2023-10-04 10:41:57 -07:00
torture.c	torture: Print out torture module parameters	2023-09-24 17:24:01 +02:00
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	smp: Change function signatures to use call_single_data_t	2023-09-13 14:59:24 +02:00
user-return-notifier.c
user.c	binfmt_misc: enable sandboxed mounts	2023-10-11 08:46:01 -07:00
user_namespace.c	mnt_idmapping: decouple from namespaces	2023-11-28 14:08:47 +01:00
usermode_driver.c
utsname.c
utsname_sysctl.c
vhost_task.c
watch_queue.c	watch_queue: fix kcalloc() arguments order	2023-12-21 13:17:54 +01:00
watchdog.c	watchdog: if panicking and we dumped everything, don't re-enable dumping	2023-12-29 12:22:30 -08:00
watchdog_buddy.c
watchdog_perf.c
workqueue.c	Merge branch 'for-6.7-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq into for-6.8	2023-11-22 06:18:49 -10:00
workqueue_internal.h	workqueue: Drop the special locking rule for worker->flags and worker_pool->flags	2023-08-07 15:57:22 -10:00