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([216.195.201.23]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-36ca38d46fcsm9019567eec.13.2026.11.04.08.56.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 04 Nov 2026 08:56:33 -0800 (PST) From: Kunwu Chan To: paulmck@kernel.org, boqun@kernel.org, mathieu.desnoyers@efficios.com, jiangshanlai@gmail.com, corbet@lwn.net, mingo@redhat.com, frederic@kernel.org, neeraj.upadhyay@kernel.org, josh@joshtriplett.org, urezki@gmail.com, dave@stgolabs.net Cc: stern@rowland.harvard.edu, parri.andrea@gmail.com, will@kernel.org, dhowells@redhat.com, j.alglave@ucl.ac.uk, luc.maranget@inria.fr, akiyks@gmail.com, dlustig@nvidia.com, joelagnelf@nvidia.com, skhan@linuxfoundation.org, rdunlap@infradead.org, longman@redhat.com, rostedt@goodmis.org, qiang.zhang@linux.dev, kunwu.chan@gmail.com, brads@mainlining.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, lkmm@lists.linux.dev, linux-doc@vger.kernel.org, rcu@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: [PATCH 08/28] hazptrtorture: Add slowpath and lockdep scenarios Date: Thu, 5 Nov 2026 00:54:26 +0800 Message-ID: <20261104165504.2430480-9-kunwu.chan@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20261104165504.2430480-1-kunwu.chan@gmail.com> References: <20261104165504.2430480-1-kunwu.chan@gmail.com> X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Add SLOWPATH and LOCKDEP configs: SLOWPATH enables CONFIG_HAZPTR_ACQUIRE_FORCE_SLOWPATH for slow-path stress; LOCKDEP combines PROVE_LOCKING with wq_churn=1 so each alloc_workqueue/ destroy_workqueue pair exercises the lockdep hazptr paths. Suggested-by: Boqun Feng Signed-off-by: Kunwu Chan --- kernel/rcu/hazptrtorture.c | 48 ++++++++++++++++++- .../rcutorture/configs/hazptr/LOCKDEP | 16 +++++++ .../rcutorture/configs/hazptr/LOCKDEP.boot | 1 + .../rcutorture/configs/hazptr/SLOWPATH | 16 +++++++ 4 files changed, 79 insertions(+), 2 deletions(-) create mode 100644 tools/testing/selftests/rcutorture/configs/hazptr/LOCKDEP create mode 100644 tools/testing/selftests/rcutorture/configs/hazptr/LOCKDEP.boot create mode 100644 tools/testing/selftests/rcutorture/configs/hazptr/SLOWPATH diff --git a/kernel/rcu/hazptrtorture.c b/kernel/rcu/hazptrtorture.c index c8b7c208775b..fe09280d063c 100644 --- a/kernel/rcu/hazptrtorture.c +++ b/kernel/rcu/hazptrtorture.c @@ -23,6 +23,7 @@ #include #include #include +#include #include "rcu.h" @@ -51,6 +52,8 @@ torture_param(int, shutdown_secs, 0, "Shutdown time (s), <= zero to disable."); torture_param(int, stat_interval, 60, "Number of seconds between stats printk()s"); torture_param(int, stutter, 5, "Number of seconds to run/halt test"); torture_param(int, verbose, 1, "Enable verbose debugging printk()s"); +torture_param(bool, wq_churn, false, + "Churn workqueues to exercise lockdep dynamic keys"); static char *torture_type = "hazptr"; module_param(torture_type, charp, 0444); @@ -62,6 +65,7 @@ static struct task_struct *preempt_task; static struct task_struct **reader_tasks; static struct task_struct *do_pending_task; static struct task_struct *stats_task; +static struct task_struct *wq_churn_task; #define HAZPTR_TORTURE_PIPE_LEN 10 @@ -83,6 +87,7 @@ static atomic_t n_hazptr_torture_alloc; static atomic_t n_hazptr_torture_alloc_fail; static atomic_t n_hazptr_torture_free; static atomic_t n_hazptr_torture_error; +static atomic_t n_hazptr_torture_wq_churn; static DEFINE_PER_CPU(atomic_long_t, hazptr_torture_acquires); static DEFINE_PER_CPU(atomic_long_t, hazptr_torture_releases); static DEFINE_PER_CPU(atomic_long_t, hazptr_torture_acquires_irq); @@ -668,13 +673,14 @@ hazptr_torture_stats_print(void) atomic_read(&n_hazptr_torture_alloc_fail), atomic_read(&n_hazptr_torture_free)); torture_onoff_stats(); - pr_cont("acq: %lld rel: %lld acqirq: %lld relirq: %lld reldefer: %lld relundefer %lld\n", + pr_cont("acq: %lld rel: %lld acqirq: %lld relirq: %lld reldefer: %lld relundefer %lld wqchurn: %d\n", torture_sum_pcpu_atomic_long(&hazptr_torture_acquires), torture_sum_pcpu_atomic_long(&hazptr_torture_releases), torture_sum_pcpu_atomic_long(&hazptr_torture_acquires_irq), torture_sum_pcpu_atomic_long(&hazptr_torture_releases_irq), torture_sum_pcpu_atomic_long(&hazptr_torture_releases_defer), - torture_sum_pcpu_atomic_long(&hazptr_torture_releases_undefer)); + torture_sum_pcpu_atomic_long(&hazptr_torture_releases_undefer), + atomic_read(&n_hazptr_torture_wq_churn)); pr_alert("%s%s ", torture_type, TORTURE_FLAG); if (i > 1) { @@ -788,6 +794,38 @@ static int hazptr_torture_preempt(void *unused) return 0; } +static void hazptr_torture_wq_churn_fn(struct work_struct *work) +{ +} + +/* + * Repeatedly create and destroy workqueues. Each workqueue creation + * registers a lockdep dynamic key and each destruction unregisters it, + * which exercises both is_dynamic_key() and lockdep_unregister_key(). + */ +static int hazptr_torture_wq_churn(void *unused) +{ + VERBOSE_TOROUT_STRING("hazptr_torture_wq_churn task started"); + do { + struct workqueue_struct *wq; + struct work_struct churn_work; + + wq = alloc_workqueue("hazptr-torture-churn", WQ_PERCPU, 1); + if (!wq) { + torture_hrtimeout_ms(10, 10, NULL); + continue; + } + INIT_WORK(&churn_work, hazptr_torture_wq_churn_fn); + queue_work(wq, &churn_work); + flush_work(&churn_work); + destroy_workqueue(wq); + atomic_inc(&n_hazptr_torture_wq_churn); + stutter_wait("hazptr_torture_wq_churn"); + } while (!torture_must_stop()); + torture_kthread_stopping("hazptr_torture_wq_churn"); + return 0; +} + static void hazptr_torture_cleanup(void) { @@ -880,6 +918,7 @@ static int __init hazptr_torture_init(void) atomic_set(&n_hazptr_torture_alloc_fail, 0); atomic_set(&n_hazptr_torture_free, 0); atomic_set(&n_hazptr_torture_error, 0); + atomic_set(&n_hazptr_torture_wq_churn, 0); for (i = 0; i < HAZPTR_TORTURE_PIPE_LEN + 1; i++) atomic_set(&hazptr_torture_wcount[i], 0); for_each_possible_cpu(cpu) { @@ -960,6 +999,11 @@ static int __init hazptr_torture_init(void) if (torture_init_error(firsterr)) goto unwind; } + if (wq_churn) { + firsterr = torture_create_kthread(hazptr_torture_wq_churn, NULL, wq_churn_task); + if (torture_init_error(firsterr)) + goto unwind; + } torture_init_end(); return 0; diff --git a/tools/testing/selftests/rcutorture/configs/hazptr/LOCKDEP b/tools/testing/selftests/rcutorture/configs/hazptr/LOCKDEP new file mode 100644 index 000000000000..f0ff29925a54 --- /dev/null +++ b/tools/testing/selftests/rcutorture/configs/hazptr/LOCKDEP @@ -0,0 +1,16 @@ +CONFIG_SMP=y +CONFIG_NR_CPUS=16 +CONFIG_PREEMPT_NONE=n +CONFIG_PREEMPT_VOLUNTARY=n +CONFIG_PREEMPT=y +CONFIG_HZ_PERIODIC=n +CONFIG_NO_HZ_IDLE=y +CONFIG_NO_HZ_FULL=n +CONFIG_HOTPLUG_CPU=y +CONFIG_SUSPEND=n +CONFIG_HIBERNATION=n +CONFIG_DEBUG_LOCK_ALLOC=y +CONFIG_PROVE_LOCKING=y +CONFIG_DEBUG_OBJECTS_RCU_HEAD=n +CONFIG_DEBUG_KERNEL=y +CONFIG_HAZPTR_DEBUG=y diff --git a/tools/testing/selftests/rcutorture/configs/hazptr/LOCKDEP.boot b/tools/testing/selftests/rcutorture/configs/hazptr/LOCKDEP.boot new file mode 100644 index 000000000000..7b16720214bd --- /dev/null +++ b/tools/testing/selftests/rcutorture/configs/hazptr/LOCKDEP.boot @@ -0,0 +1 @@ +hazptrtorture.wq_churn=1 diff --git a/tools/testing/selftests/rcutorture/configs/hazptr/SLOWPATH b/tools/testing/selftests/rcutorture/configs/hazptr/SLOWPATH new file mode 100644 index 000000000000..4d13028ca84c --- /dev/null +++ b/tools/testing/selftests/rcutorture/configs/hazptr/SLOWPATH @@ -0,0 +1,16 @@ +CONFIG_SMP=y +CONFIG_NR_CPUS=16 +CONFIG_PREEMPT_NONE=n +CONFIG_PREEMPT_VOLUNTARY=n +CONFIG_PREEMPT=y +CONFIG_HZ_PERIODIC=n +CONFIG_NO_HZ_IDLE=y +CONFIG_NO_HZ_FULL=n +CONFIG_HOTPLUG_CPU=y +CONFIG_SUSPEND=n +CONFIG_HIBERNATION=n +CONFIG_PROVE_LOCKING=n +CONFIG_DEBUG_OBJECTS_RCU_HEAD=n +CONFIG_DEBUG_KERNEL=y +CONFIG_HAZPTR_DEBUG=y +CONFIG_HAZPTR_ACQUIRE_FORCE_SLOWPATH=y -- 2.43.0