Joel Fernandes (Google) a231a59ec9 rcutorture: Fix stuttering races and other issues ... [ Upstream commit cca42bd8eb ] The stuttering code isn't functioning as expected. Ideally, it should pause the torture threads for a designated period before resuming. Yet, it fails to halt the test for the correct duration. Additionally, a race condition exists, potentially causing the stuttering code to pause for an extended period if the 'spt' variable is non-zero due to the stutter orchestration thread's inadequate CPU time. Moreover, over-stuttering can hinder RCU's progress on TREE07 kernels. This happens as the stuttering code may run within a softirq due to RCU callbacks. Consequently, ksoftirqd keeps a CPU busy for several seconds, thus obstructing RCU's progress. This situation triggers a warning message in the logs: [ 2169.481783] rcu_torture_writer: rtort_pipe_count: 9 This warning suggests that an RCU torture object, although invisible to RCU readers, couldn't make it past the pipe array and be freed -- a strong indication that there weren't enough grace periods during the stutter interval. To address these issues, this patch sets the "stutter end" time to an absolute point in the future set by the main stutter thread. This is then used for waiting in stutter_wait(). While the stutter thread still defines this absolute time, the waiters' waiting logic doesn't rely on the stutter thread receiving sufficient CPU time to halt the stuttering as the halting is now self-controlled. Cc: stable@vger.kernel.org Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org> Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Frederic Weisbecker <frederic@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		2023-11-28 17:15:10 +00:00
..
bpf	bpf: Fix precision tracking for BPF_ALU | BPF_TO_BE | BPF_END	2023-11-28 17:14:59 +00:00
cgroup	sched: psi: fix unprivileged polling against cgroups	2023-11-28 17:15:00 +00:00
configs	mm/slab: rename CONFIG_SLAB to CONFIG_SLAB_DEPRECATED	2023-05-26 19:01:47 +02:00
debug	kgdb: Flush console before entering kgdb on panic	2023-11-28 17:14:51 +00:00
dma	dma-debug: don't call __dma_entry_alloc_check_leak() under free_entries_lock	2023-10-06 13:16:07 +02:00
entry	ptrace: Provide set/get interface for syscall user dispatch	2023-04-16 14:23:07 +02:00
events	perf/core: Fix cpuctx refcounting	2023-11-28 17:14:58 +00:00
futex	futex: Don't include process MM in futex key on no-MMU	2023-11-20 11:56:43 +01:00
gcov
irq	genirq/generic_chip: Make irq_remove_generic_chip() irqdomain aware	2023-11-28 17:15:02 +00:00
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 11:57:13 +01:00
locking	torture: Add lock_torture writer_fifo module parameter	2023-11-28 17:15:09 +00:00
module	module/decompress: use kvmalloc() consistently	2023-11-20 11:57:24 +01:00
power	PM: hibernate: Clean up sync_read handling in snapshot_write_next()	2023-11-28 17:15:05 +00:00
printk	printk: Rename abandon_console_lock_in_panic() to other_cpu_in_panic()	2023-09-23 11:14:30 +02:00
rcu	rcu: kmemleak: Ignore kmemleak false positives when RCU-freeing objects	2023-11-28 17:15:05 +00:00
sched	sched/core: Fix RQCF_ACT_SKIP leak	2023-11-28 17:15:03 +00:00
time	tick/rcu: Fix false positive "softirq work is pending" messages	2023-09-13 09:53:45 +02:00
trace	tracing: Have the user copy of synthetic event address use correct context	2023-11-28 17:15:07 +00:00
.gitignore
acct.c
async.c
audit.c
audit.h	audit: avoid missing-prototype warnings	2023-05-17 11:34:55 -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 17:15:00 +00:00
auditfilter.c
auditsc.c	audit,io_uring: io_uring openat triggers audit reference count underflow	2023-10-25 12:16:11 +02:00
backtracetest.c
bounds.c
capability.c	capability: fix kernel-doc warnings in capability.c	2023-05-22 14:30:52 -04:00
cfi.c
compat.c	sched_getaffinity: don't assume 'cpumask_size()' is fully initialized	2023-03-14 19:32:38 -07:00
configs.c
context_tracking.c	locking/atomic: treewide: use raw_atomic*_<op>()	2023-06-05 09:57:20 +02:00
cpu.c	cpu/hotplug: Don't offline the last non-isolated CPU	2023-11-28 17:14:41 +00:00
cpu_pm.c	cpuidle, cpu_pm: Remove RCU fiddling from cpu_pm_{enter,exit}()	2023-01-13 11:48:15 +01:00
crash_core.c	mm, treewide: redefine MAX_ORDER sanely	2023-04-05 19:42:46 -07:00
crash_dump.c
cred.c
delayacct.c	delayacct: track delays from IRQ/SOFTIRQ	2023-04-18 16:39:34 -07:00
dma.c
exec_domain.c
exit.c	fork, vhost: Use CLONE_THREAD to fix freezer/ps regression	2023-06-01 17:15:33 -04:00
extable.c
fail_function.c	kernel/fail_function: fix memory leak with using debugfs_lookup()	2023-02-08 13:36:22 +01:00
fork.c	kernel/fork: beware of __put_task_struct() calling context	2023-09-23 11:14:17 +02:00
freezer.c
gen_kheaders.sh	Revert "kheaders: substituting --sort in archive creation"	2023-05-28 16:20:21 +09:00
groups.c
hung_task.c	kernel/hung_task.c: set some hung_task.c variables storage-class-specifier to static	2023-04-08 13:45:37 -07:00
iomem.c
irq_work.c	trace: Add trace_ipi_send_cpu()	2023-03-24 11:01:29 +01:00
jump_label.c
kallsyms.c	kallsyms: Fix kallsyms_selftest failure	2023-09-02 09:13:30 +02:00
kallsyms_internal.h
kallsyms_selftest.c	kallsyms: Fix kallsyms_selftest failure	2023-09-02 09:13:30 +02:00
kallsyms_selftest.h
kcmp.c
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt
kcov.c	kcov: add prototypes for helper functions	2023-06-09 17:44:17 -07:00
kexec.c	kernel: kexec: copy user-array safely	2023-11-28 17:14:45 +00:00
kexec_core.c	kexec: enable kexec_crash_size to support two crash kernel regions	2023-06-09 17:44:24 -07:00
kexec_elf.c
kexec_file.c	- Arnd Bergmann has fixed a bunch of -Wmissing-prototypes in	2023-06-28 10:59:38 -07:00
kexec_internal.h
kheaders.c	kheaders: Use array declaration instead of char	2023-03-24 20:10:59 -07:00
kprobes.c	kprobes: Prohibit probing on CFI preamble symbol	2023-07-29 23:32:26 +09:00
ksyms_common.c	kallsyms: make kallsyms_show_value() as generic function	2023-06-08 12:27:20 -07:00
ksysfs.c	kernel/ksysfs.c: use sysfs_emit for sysfs show handlers	2023-03-24 17:09:14 +01:00
kthread.c	- Arnd Bergmann has fixed a bunch of -Wmissing-prototypes in	2023-06-28 10:59:38 -07:00
latencytop.c
Makefile	v6.5-rc1-modules-next	2023-06-28 15:51:08 -07:00
module_signature.c
notifier.c	notifiers: add tracepoints to the notifiers infrastructure	2023-04-08 13:45:38 -07:00
nsproxy.c	convert setns(2) to fdget()/fdput()	2023-04-20 22:55:35 -04:00
padata.c	crypto: pcrypt - Fix hungtask for PADATA_RESET	2023-11-28 17:14:46 +00:00
panic.c	panic: Reenable preemption in WARN slowpath	2023-09-23 11:14:33 +02:00
params.c	kallsyms: Replace all non-returning strlcpy with strscpy	2023-06-14 12:27:38 -07:00
pid.c	memfd: replace ratcheting feature from vm.memfd_noexec with hierarchy	2023-09-13 09:53:57 +02:00
pid_namespace.c	memfd: replace ratcheting feature from vm.memfd_noexec with hierarchy	2023-09-13 09:53:57 +02:00
pid_sysctl.h	memfd: replace ratcheting feature from vm.memfd_noexec with hierarchy	2023-09-13 09:53:57 +02:00
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 17:15:07 +00:00
regset.c
relay.c	relayfs: fix out-of-bounds access in relay_file_read	2023-05-02 17:23:27 -07:00
resource.c	dax/kmem: Fix leak of memory-hotplug resources	2023-02-17 14:58:01 -08:00
resource_kunit.c
rseq.c
scftorture.c	scftorture: Forgive memory-allocation failure if KASAN	2023-09-23 11:14:18 +02:00
scs.c
seccomp.c	seccomp: simplify sysctls with register_sysctl_init()	2023-04-13 11:49:20 -07:00
signal.c	mm: suppress mm fault logging if fatal signal already pending	2023-07-26 10:51:59 -07:00
smp.c	smp,csd: Throw an error if a CSD lock is stuck for too long	2023-11-28 17:14:41 +00:00
smpboot.c	cpu/hotplug: Remove unused state functions	2023-05-15 13:45:00 +02:00
smpboot.h
softirq.c	Revert "softirq: Let ksoftirqd do its job"	2023-05-09 21:50:27 +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: move PR_GET_AUXV out of PR_MCE_KILL	2023-07-17 12:53:21 -07:00
sys_ni.c	asm-generic updates for 6.5	2023-07-06 10:06:04 -07:00
sysctl-test.c
sysctl.c	v6.5-rc1-sysctl-next	2023-06-28 16:05:21 -07:00
task_work.c
taskstats.c
torture.c	rcutorture: Fix stuttering races and other issues	2023-11-28 17:15:10 +00:00
tracepoint.c	tracepoint: Allow livepatch module add trace event	2023-02-18 14:34:36 -05:00
tsacct.c
ucount.c
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	userns: fix a struct's kernel-doc notation	2023-02-02 22:50:04 -08:00
usermode_driver.c
utsname.c
utsname_sysctl.c	utsname: simplify one-level sysctl registration for uts_kern_table	2023-04-13 11:49:35 -07:00
vhost_task.c	vhost: Fix worker hangs due to missed wake up calls	2023-06-08 15:43:09 -04:00
watch_queue.c	kernel: watch_queue: copy user-array safely	2023-11-28 17:14:45 +00:00
watchdog.c	watchdog: move softlockup_panic back to early_param	2023-11-28 17:15:01 +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: Provide one lock class key per work_on_cpu() callsite	2023-11-28 17:14:41 +00:00
workqueue_internal.h	workqueue: Automatically mark CPU-hogging work items CPU_INTENSIVE	2023-05-17 17:02:08 -10:00