lib/test_lockup: test module to generate lockups
authorKonstantin Khlebnikov <khlebnikov@yandex-team.ru>
Tue, 7 Apr 2020 03:09:47 +0000 (20:09 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Tue, 7 Apr 2020 17:43:42 +0000 (10:43 -0700)
CONFIG_TEST_LOCKUP=m adds module "test_lockup" that helps to make sure
that watchdogs and lockup detectors are working properly.

Depending on module parameters test_lockup could emulate soft or hard
lockup, "hung task", hold arbitrary lock, allocate bunch of pages.

Also it could generate series of lockups with cooling-down periods, in
this way it could be used as "ping" for locks or page allocator.  Loop
checks signals between iteration thus could be stopped by ^C.

# modinfo test_lockup
...
parm:           time_secs:lockup time in seconds, default 0 (uint)
parm:           time_nsecs:nanoseconds part of lockup time, default 0 (uint)
parm:           cooldown_secs:cooldown time between iterations in seconds, default 0 (uint)
parm:           cooldown_nsecs:nanoseconds part of cooldown, default 0 (uint)
parm:           iterations:lockup iterations, default 1 (uint)
parm:           all_cpus:trigger lockup at all cpus at once (bool)
parm:           state:wait in 'R' running (default), 'D' uninterruptible, 'K' killable, 'S' interruptible state (charp)
parm:           use_hrtimer:use high-resolution timer for sleeping (bool)
parm:           iowait:account sleep time as iowait (bool)
parm:           lock_read:lock read-write locks for read (bool)
parm:           lock_single:acquire locks only at one cpu (bool)
parm:           reacquire_locks:release and reacquire locks/irq/preempt between iterations (bool)
parm:           touch_softlockup:touch soft-lockup watchdog between iterations (bool)
parm:           touch_hardlockup:touch hard-lockup watchdog between iterations (bool)
parm:           call_cond_resched:call cond_resched() between iterations (bool)
parm:           measure_lock_wait:measure lock wait time (bool)
parm:           lock_wait_threshold:print lock wait time longer than this in nanoseconds, default off (ulong)
parm:           disable_irq:disable interrupts: generate hard-lockups (bool)
parm:           disable_softirq:disable bottom-half irq handlers (bool)
parm:           disable_preempt:disable preemption: generate soft-lockups (bool)
parm:           lock_rcu:grab rcu_read_lock: generate rcu stalls (bool)
parm:           lock_mmap_sem:lock mm->mmap_sem: block procfs interfaces (bool)
parm:           lock_rwsem_ptr:lock rw_semaphore at address (ulong)
parm:           lock_mutex_ptr:lock mutex at address (ulong)
parm:           lock_spinlock_ptr:lock spinlock at address (ulong)
parm:           lock_rwlock_ptr:lock rwlock at address (ulong)
parm:           alloc_pages_nr:allocate and free pages under locks (uint)
parm:           alloc_pages_order:page order to allocate (uint)
parm:           alloc_pages_gfp:allocate pages with this gfp_mask, default GFP_KERNEL (uint)
parm:           alloc_pages_atomic:allocate pages with GFP_ATOMIC (bool)
parm:           reallocate_pages:free and allocate pages between iterations (bool)

Parameters for locking by address are unsafe and taints kernel. With
CONFIG_DEBUG_SPINLOCK=y they at least check magics for embedded spinlocks.

Examples:

task hang in D-state:
modprobe test_lockup time_secs=1 iterations=60 state=D

task hang in io-wait D-state:
modprobe test_lockup time_secs=1 iterations=60 state=D iowait

softlockup:
modprobe test_lockup time_secs=1 iterations=60 state=R

hardlockup:
modprobe test_lockup time_secs=1 iterations=60 state=R disable_irq

system-wide hardlockup:
modprobe test_lockup time_secs=1 iterations=60 state=R \
 disable_irq all_cpus

rcu stall:
modprobe test_lockup time_secs=1 iterations=60 state=R \
 lock_rcu touch_softlockup

lock mmap_sem / block procfs interfaces:
modprobe test_lockup time_secs=1 iterations=60 state=S lock_mmap_sem

lock tasklist_lock for read / block forks:
TASKLIST_LOCK=$(awk '$3 == "tasklist_lock" {print "0x"$1}' /proc/kallsyms)
modprobe test_lockup time_secs=1 iterations=60 state=R \
 disable_irq lock_read lock_rwlock_ptr=$TASKLIST_LOCK

lock namespace_sem / block vfs mount operations:
NAMESPACE_SEM=$(awk '$3 == "namespace_sem" {print "0x"$1}' /proc/kallsyms)
modprobe test_lockup time_secs=1 iterations=60 state=S \
 lock_rwsem_ptr=$NAMESPACE_SEM

lock cgroup mutex / block cgroup operations:
CGROUP_MUTEX=$(awk '$3 == "cgroup_mutex" {print "0x"$1}' /proc/kallsyms)
modprobe test_lockup time_secs=1 iterations=60 state=S \
 lock_mutex_ptr=$CGROUP_MUTEX

ping cgroup_mutex every second and measure maximum lock wait time:
modprobe test_lockup cooldown_secs=1 iterations=60 state=S \
 lock_mutex_ptr=$CGROUP_MUTEX reacquire_locks measure_lock_wait

[linux@roeck-us.net: rename disable_irq to fix build error]
Link: http://lkml.kernel.org/r/20200317133614.23152-1-linux@roeck-us.net
Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Sasha Levin <sashal@kernel.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Dmitry Monakhov <dmtrmonakhov@yandex-team.ru
Cc: Colin Ian King <colin.king@canonical.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Link: http://lkml.kernel.org/r/158132859146.2797.525923171323227836.stgit@buzz
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
lib/Kconfig.debug
lib/Makefile
lib/test_lockup.c [new file with mode: 0644]

index 7f9a898..ddcf000 100644 (file)
@@ -976,6 +976,18 @@ config WQ_WATCHDOG
          state.  This can be configured through kernel parameter
          "workqueue.watchdog_thresh" and its sysfs counterpart.
 
+config TEST_LOCKUP
+       tristate "Test module to generate lockups"
+       help
+         This builds the "test_lockup" module that helps to make sure
+         that watchdogs and lockup detectors are working properly.
+
+         Depending on module parameters it could emulate soft or hard
+         lockup, "hung task", or locking arbitrary lock for a long time.
+         Also it could generate series of lockups with cooling-down periods.
+
+         If unsure, say N.
+
 endmenu # "Debug lockups and hangs"
 
 menu "Scheduler Debugging"
index 09a8acb..0fd125c 100644 (file)
@@ -90,6 +90,7 @@ obj-$(CONFIG_TEST_OBJAGG) += test_objagg.o
 obj-$(CONFIG_TEST_STACKINIT) += test_stackinit.o
 obj-$(CONFIG_TEST_BLACKHOLE_DEV) += test_blackhole_dev.o
 obj-$(CONFIG_TEST_MEMINIT) += test_meminit.o
+obj-$(CONFIG_TEST_LOCKUP) += test_lockup.o
 
 obj-$(CONFIG_TEST_LIVEPATCH) += livepatch/
 
diff --git a/lib/test_lockup.c b/lib/test_lockup.c
new file mode 100644 (file)
index 0000000..9e8b8a0
--- /dev/null
@@ -0,0 +1,554 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Test module to generate lockups
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/sched.h>
+#include <linux/sched/signal.h>
+#include <linux/sched/clock.h>
+#include <linux/cpu.h>
+#include <linux/nmi.h>
+#include <linux/mm.h>
+#include <linux/uaccess.h>
+
+static unsigned int time_secs;
+module_param(time_secs, uint, 0600);
+MODULE_PARM_DESC(time_secs, "lockup time in seconds, default 0");
+
+static unsigned int time_nsecs;
+module_param(time_nsecs, uint, 0600);
+MODULE_PARM_DESC(time_nsecs, "nanoseconds part of lockup time, default 0");
+
+static unsigned int cooldown_secs;
+module_param(cooldown_secs, uint, 0600);
+MODULE_PARM_DESC(cooldown_secs, "cooldown time between iterations in seconds, default 0");
+
+static unsigned int cooldown_nsecs;
+module_param(cooldown_nsecs, uint, 0600);
+MODULE_PARM_DESC(cooldown_nsecs, "nanoseconds part of cooldown, default 0");
+
+static unsigned int iterations = 1;
+module_param(iterations, uint, 0600);
+MODULE_PARM_DESC(iterations, "lockup iterations, default 1");
+
+static bool all_cpus;
+module_param(all_cpus, bool, 0400);
+MODULE_PARM_DESC(all_cpus, "trigger lockup at all cpus at once");
+
+static int wait_state;
+static char *state = "R";
+module_param(state, charp, 0400);
+MODULE_PARM_DESC(state, "wait in 'R' running (default), 'D' uninterruptible, 'K' killable, 'S' interruptible state");
+
+static bool use_hrtimer;
+module_param(use_hrtimer, bool, 0400);
+MODULE_PARM_DESC(use_hrtimer, "use high-resolution timer for sleeping");
+
+static bool iowait;
+module_param(iowait, bool, 0400);
+MODULE_PARM_DESC(iowait, "account sleep time as iowait");
+
+static bool lock_read;
+module_param(lock_read, bool, 0400);
+MODULE_PARM_DESC(lock_read, "lock read-write locks for read");
+
+static bool lock_single;
+module_param(lock_single, bool, 0400);
+MODULE_PARM_DESC(lock_single, "acquire locks only at one cpu");
+
+static bool reacquire_locks;
+module_param(reacquire_locks, bool, 0400);
+MODULE_PARM_DESC(reacquire_locks, "release and reacquire locks/irq/preempt between iterations");
+
+static bool touch_softlockup;
+module_param(touch_softlockup, bool, 0600);
+MODULE_PARM_DESC(touch_softlockup, "touch soft-lockup watchdog between iterations");
+
+static bool touch_hardlockup;
+module_param(touch_hardlockup, bool, 0600);
+MODULE_PARM_DESC(touch_hardlockup, "touch hard-lockup watchdog between iterations");
+
+static bool call_cond_resched;
+module_param(call_cond_resched, bool, 0600);
+MODULE_PARM_DESC(call_cond_resched, "call cond_resched() between iterations");
+
+static bool measure_lock_wait;
+module_param(measure_lock_wait, bool, 0400);
+MODULE_PARM_DESC(measure_lock_wait, "measure lock wait time");
+
+static unsigned long lock_wait_threshold = ULONG_MAX;
+module_param(lock_wait_threshold, ulong, 0400);
+MODULE_PARM_DESC(lock_wait_threshold, "print lock wait time longer than this in nanoseconds, default off");
+
+static bool test_disable_irq;
+module_param_named(disable_irq, test_disable_irq, bool, 0400);
+MODULE_PARM_DESC(disable_irq, "disable interrupts: generate hard-lockups");
+
+static bool disable_softirq;
+module_param(disable_softirq, bool, 0400);
+MODULE_PARM_DESC(disable_softirq, "disable bottom-half irq handlers");
+
+static bool disable_preempt;
+module_param(disable_preempt, bool, 0400);
+MODULE_PARM_DESC(disable_preempt, "disable preemption: generate soft-lockups");
+
+static bool lock_rcu;
+module_param(lock_rcu, bool, 0400);
+MODULE_PARM_DESC(lock_rcu, "grab rcu_read_lock: generate rcu stalls");
+
+static bool lock_mmap_sem;
+module_param(lock_mmap_sem, bool, 0400);
+MODULE_PARM_DESC(lock_mmap_sem, "lock mm->mmap_sem: block procfs interfaces");
+
+static unsigned long lock_rwsem_ptr;
+module_param_unsafe(lock_rwsem_ptr, ulong, 0400);
+MODULE_PARM_DESC(lock_rwsem_ptr, "lock rw_semaphore at address");
+
+static unsigned long lock_mutex_ptr;
+module_param_unsafe(lock_mutex_ptr, ulong, 0400);
+MODULE_PARM_DESC(lock_mutex_ptr, "lock mutex at address");
+
+static unsigned long lock_spinlock_ptr;
+module_param_unsafe(lock_spinlock_ptr, ulong, 0400);
+MODULE_PARM_DESC(lock_spinlock_ptr, "lock spinlock at address");
+
+static unsigned long lock_rwlock_ptr;
+module_param_unsafe(lock_rwlock_ptr, ulong, 0400);
+MODULE_PARM_DESC(lock_rwlock_ptr, "lock rwlock at address");
+
+static unsigned int alloc_pages_nr;
+module_param_unsafe(alloc_pages_nr, uint, 0600);
+MODULE_PARM_DESC(alloc_pages_nr, "allocate and free pages under locks");
+
+static unsigned int alloc_pages_order;
+module_param(alloc_pages_order, uint, 0400);
+MODULE_PARM_DESC(alloc_pages_order, "page order to allocate");
+
+static gfp_t alloc_pages_gfp = GFP_KERNEL;
+module_param_unsafe(alloc_pages_gfp, uint, 0400);
+MODULE_PARM_DESC(alloc_pages_gfp, "allocate pages with this gfp_mask, default GFP_KERNEL");
+
+static bool alloc_pages_atomic;
+module_param(alloc_pages_atomic, bool, 0400);
+MODULE_PARM_DESC(alloc_pages_atomic, "allocate pages with GFP_ATOMIC");
+
+static bool reallocate_pages;
+module_param(reallocate_pages, bool, 0400);
+MODULE_PARM_DESC(reallocate_pages, "free and allocate pages between iterations");
+
+static atomic_t alloc_pages_failed = ATOMIC_INIT(0);
+
+static atomic64_t max_lock_wait = ATOMIC64_INIT(0);
+
+static struct task_struct *main_task;
+static int master_cpu;
+
+static void test_lock(bool master, bool verbose)
+{
+       u64 uninitialized_var(wait_start);
+
+       if (measure_lock_wait)
+               wait_start = local_clock();
+
+       if (lock_mutex_ptr && master) {
+               if (verbose)
+                       pr_notice("lock mutex %ps\n", (void *)lock_mutex_ptr);
+               mutex_lock((struct mutex *)lock_mutex_ptr);
+       }
+
+       if (lock_rwsem_ptr && master) {
+               if (verbose)
+                       pr_notice("lock rw_semaphore %ps\n",
+                                 (void *)lock_rwsem_ptr);
+               if (lock_read)
+                       down_read((struct rw_semaphore *)lock_rwsem_ptr);
+               else
+                       down_write((struct rw_semaphore *)lock_rwsem_ptr);
+       }
+
+       if (lock_mmap_sem && master) {
+               if (verbose)
+                       pr_notice("lock mmap_sem pid=%d\n", main_task->pid);
+               if (lock_read)
+                       down_read(&main_task->mm->mmap_sem);
+               else
+                       down_write(&main_task->mm->mmap_sem);
+       }
+
+       if (test_disable_irq)
+               local_irq_disable();
+
+       if (disable_softirq)
+               local_bh_disable();
+
+       if (disable_preempt)
+               preempt_disable();
+
+       if (lock_rcu)
+               rcu_read_lock();
+
+       if (lock_spinlock_ptr && master) {
+               if (verbose)
+                       pr_notice("lock spinlock %ps\n",
+                                 (void *)lock_spinlock_ptr);
+               spin_lock((spinlock_t *)lock_spinlock_ptr);
+       }
+
+       if (lock_rwlock_ptr && master) {
+               if (verbose)
+                       pr_notice("lock rwlock %ps\n",
+                                 (void *)lock_rwlock_ptr);
+               if (lock_read)
+                       read_lock((rwlock_t *)lock_rwlock_ptr);
+               else
+                       write_lock((rwlock_t *)lock_rwlock_ptr);
+       }
+
+       if (measure_lock_wait) {
+               s64 cur_wait = local_clock() - wait_start;
+               s64 max_wait = atomic64_read(&max_lock_wait);
+
+               do {
+                       if (cur_wait < max_wait)
+                               break;
+                       max_wait = atomic64_cmpxchg(&max_lock_wait,
+                                                   max_wait, cur_wait);
+               } while (max_wait != cur_wait);
+
+               if (cur_wait > lock_wait_threshold)
+                       pr_notice_ratelimited("lock wait %lld ns\n", cur_wait);
+       }
+}
+
+static void test_unlock(bool master, bool verbose)
+{
+       if (lock_rwlock_ptr && master) {
+               if (lock_read)
+                       read_unlock((rwlock_t *)lock_rwlock_ptr);
+               else
+                       write_unlock((rwlock_t *)lock_rwlock_ptr);
+               if (verbose)
+                       pr_notice("unlock rwlock %ps\n",
+                                 (void *)lock_rwlock_ptr);
+       }
+
+       if (lock_spinlock_ptr && master) {
+               spin_unlock((spinlock_t *)lock_spinlock_ptr);
+               if (verbose)
+                       pr_notice("unlock spinlock %ps\n",
+                                 (void *)lock_spinlock_ptr);
+       }
+
+       if (lock_rcu)
+               rcu_read_unlock();
+
+       if (disable_preempt)
+               preempt_enable();
+
+       if (disable_softirq)
+               local_bh_enable();
+
+       if (test_disable_irq)
+               local_irq_enable();
+
+       if (lock_mmap_sem && master) {
+               if (lock_read)
+                       up_read(&main_task->mm->mmap_sem);
+               else
+                       up_write(&main_task->mm->mmap_sem);
+               if (verbose)
+                       pr_notice("unlock mmap_sem pid=%d\n", main_task->pid);
+       }
+
+       if (lock_rwsem_ptr && master) {
+               if (lock_read)
+                       up_read((struct rw_semaphore *)lock_rwsem_ptr);
+               else
+                       up_write((struct rw_semaphore *)lock_rwsem_ptr);
+               if (verbose)
+                       pr_notice("unlock rw_semaphore %ps\n",
+                                 (void *)lock_rwsem_ptr);
+       }
+
+       if (lock_mutex_ptr && master) {
+               mutex_unlock((struct mutex *)lock_mutex_ptr);
+               if (verbose)
+                       pr_notice("unlock mutex %ps\n",
+                                 (void *)lock_mutex_ptr);
+       }
+}
+
+static void test_alloc_pages(struct list_head *pages)
+{
+       struct page *page;
+       unsigned int i;
+
+       for (i = 0; i < alloc_pages_nr; i++) {
+               page = alloc_pages(alloc_pages_gfp, alloc_pages_order);
+               if (!page) {
+                       atomic_inc(&alloc_pages_failed);
+                       break;
+               }
+               list_add(&page->lru, pages);
+       }
+}
+
+static void test_free_pages(struct list_head *pages)
+{
+       struct page *page, *next;
+
+       list_for_each_entry_safe(page, next, pages, lru)
+               __free_pages(page, alloc_pages_order);
+       INIT_LIST_HEAD(pages);
+}
+
+static void test_wait(unsigned int secs, unsigned int nsecs)
+{
+       if (wait_state == TASK_RUNNING) {
+               if (secs)
+                       mdelay(secs * MSEC_PER_SEC);
+               if (nsecs)
+                       ndelay(nsecs);
+               return;
+       }
+
+       __set_current_state(wait_state);
+       if (use_hrtimer) {
+               ktime_t time;
+
+               time = ns_to_ktime((u64)secs * NSEC_PER_SEC + nsecs);
+               schedule_hrtimeout(&time, HRTIMER_MODE_REL);
+       } else {
+               schedule_timeout(secs * HZ + nsecs_to_jiffies(nsecs));
+       }
+}
+
+static void test_lockup(bool master)
+{
+       u64 lockup_start = local_clock();
+       unsigned int iter = 0;
+       LIST_HEAD(pages);
+
+       pr_notice("Start on CPU%d\n", raw_smp_processor_id());
+
+       test_lock(master, true);
+
+       test_alloc_pages(&pages);
+
+       while (iter++ < iterations && !signal_pending(main_task)) {
+
+               if (iowait)
+                       current->in_iowait = 1;
+
+               test_wait(time_secs, time_nsecs);
+
+               if (iowait)
+                       current->in_iowait = 0;
+
+               if (reallocate_pages)
+                       test_free_pages(&pages);
+
+               if (reacquire_locks)
+                       test_unlock(master, false);
+
+               if (touch_softlockup)
+                       touch_softlockup_watchdog();
+
+               if (touch_hardlockup)
+                       touch_nmi_watchdog();
+
+               if (call_cond_resched)
+                       cond_resched();
+
+               test_wait(cooldown_secs, cooldown_nsecs);
+
+               if (reacquire_locks)
+                       test_lock(master, false);
+
+               if (reallocate_pages)
+                       test_alloc_pages(&pages);
+       }
+
+       pr_notice("Finish on CPU%d in %lld ns\n", raw_smp_processor_id(),
+                 local_clock() - lockup_start);
+
+       test_free_pages(&pages);
+
+       test_unlock(master, true);
+}
+
+DEFINE_PER_CPU(struct work_struct, test_works);
+
+static void test_work_fn(struct work_struct *work)
+{
+       test_lockup(!lock_single ||
+                   work == per_cpu_ptr(&test_works, master_cpu));
+}
+
+static bool test_kernel_ptr(unsigned long addr, int size)
+{
+       void *ptr = (void *)addr;
+       char buf;
+
+       if (!addr)
+               return false;
+
+       /* should be at least readable kernel address */
+       if (access_ok(ptr, 1) ||
+           access_ok(ptr + size - 1, 1) ||
+           probe_kernel_address(ptr, buf) ||
+           probe_kernel_address(ptr + size - 1, buf)) {
+               pr_err("invalid kernel ptr: %#lx\n", addr);
+               return true;
+       }
+
+       return false;
+}
+
+static bool __maybe_unused test_magic(unsigned long addr, int offset,
+                                     unsigned int expected)
+{
+       void *ptr = (void *)addr + offset;
+       unsigned int magic = 0;
+
+       if (!addr)
+               return false;
+
+       if (probe_kernel_address(ptr, magic) || magic != expected) {
+               pr_err("invalid magic at %#lx + %#x = %#x, expected %#x\n",
+                      addr, offset, magic, expected);
+               return true;
+       }
+
+       return false;
+}
+
+static int __init test_lockup_init(void)
+{
+       u64 test_start = local_clock();
+
+       main_task = current;
+
+       switch (state[0]) {
+       case 'S':
+               wait_state = TASK_INTERRUPTIBLE;
+               break;
+       case 'D':
+               wait_state = TASK_UNINTERRUPTIBLE;
+               break;
+       case 'K':
+               wait_state = TASK_KILLABLE;
+               break;
+       case 'R':
+               wait_state = TASK_RUNNING;
+               break;
+       default:
+               pr_err("unknown state=%s\n", state);
+               return -EINVAL;
+       }
+
+       if (alloc_pages_atomic)
+               alloc_pages_gfp = GFP_ATOMIC;
+
+       if (test_kernel_ptr(lock_spinlock_ptr, sizeof(spinlock_t)) ||
+           test_kernel_ptr(lock_rwlock_ptr, sizeof(rwlock_t)) ||
+           test_kernel_ptr(lock_mutex_ptr, sizeof(struct mutex)) ||
+           test_kernel_ptr(lock_rwsem_ptr, sizeof(struct rw_semaphore)))
+               return -EINVAL;
+
+#ifdef CONFIG_DEBUG_SPINLOCK
+       if (test_magic(lock_spinlock_ptr,
+                      offsetof(spinlock_t, rlock.magic),
+                      SPINLOCK_MAGIC) ||
+           test_magic(lock_rwlock_ptr,
+                      offsetof(rwlock_t, magic),
+                      RWLOCK_MAGIC) ||
+           test_magic(lock_mutex_ptr,
+                      offsetof(struct mutex, wait_lock.rlock.magic),
+                      SPINLOCK_MAGIC) ||
+           test_magic(lock_rwsem_ptr,
+                      offsetof(struct rw_semaphore, wait_lock.magic),
+                      SPINLOCK_MAGIC))
+               return -EINVAL;
+#endif
+
+       if ((wait_state != TASK_RUNNING ||
+            (call_cond_resched && !reacquire_locks) ||
+            (alloc_pages_nr && gfpflags_allow_blocking(alloc_pages_gfp))) &&
+           (test_disable_irq || disable_softirq || disable_preempt ||
+            lock_rcu || lock_spinlock_ptr || lock_rwlock_ptr)) {
+               pr_err("refuse to sleep in atomic context\n");
+               return -EINVAL;
+       }
+
+       if (lock_mmap_sem && !main_task->mm) {
+               pr_err("no mm to lock mmap_sem\n");
+               return -EINVAL;
+       }
+
+       pr_notice("START pid=%d time=%u +%u ns cooldown=%u +%u ns iteraions=%u state=%s %s%s%s%s%s%s%s%s%s%s%s\n",
+                 main_task->pid, time_secs, time_nsecs,
+                 cooldown_secs, cooldown_nsecs, iterations, state,
+                 all_cpus ? "all_cpus " : "",
+                 iowait ? "iowait " : "",
+                 test_disable_irq ? "disable_irq " : "",
+                 disable_softirq ? "disable_softirq " : "",
+                 disable_preempt ? "disable_preempt " : "",
+                 lock_rcu ? "lock_rcu " : "",
+                 lock_read ? "lock_read " : "",
+                 touch_softlockup ? "touch_softlockup " : "",
+                 touch_hardlockup ? "touch_hardlockup " : "",
+                 call_cond_resched ? "call_cond_resched " : "",
+                 reacquire_locks ? "reacquire_locks " : "");
+
+       if (alloc_pages_nr)
+               pr_notice("ALLOCATE PAGES nr=%u order=%u gfp=%pGg %s\n",
+                         alloc_pages_nr, alloc_pages_order, &alloc_pages_gfp,
+                         reallocate_pages ? "reallocate_pages " : "");
+
+       if (all_cpus) {
+               unsigned int cpu;
+
+               cpus_read_lock();
+
+               preempt_disable();
+               master_cpu = smp_processor_id();
+               for_each_online_cpu(cpu) {
+                       INIT_WORK(per_cpu_ptr(&test_works, cpu), test_work_fn);
+                       queue_work_on(cpu, system_highpri_wq,
+                                     per_cpu_ptr(&test_works, cpu));
+               }
+               preempt_enable();
+
+               for_each_online_cpu(cpu)
+                       flush_work(per_cpu_ptr(&test_works, cpu));
+
+               cpus_read_unlock();
+       } else {
+               test_lockup(true);
+       }
+
+       if (measure_lock_wait)
+               pr_notice("Maximum lock wait: %lld ns\n",
+                         atomic64_read(&max_lock_wait));
+
+       if (alloc_pages_nr)
+               pr_notice("Page allocation failed %u times\n",
+                         atomic_read(&alloc_pages_failed));
+
+       pr_notice("FINISH in %llu ns\n", local_clock() - test_start);
+
+       if (signal_pending(main_task))
+               return -EINTR;
+
+       return -EAGAIN;
+}
+module_init(test_lockup_init);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Konstantin Khlebnikov <khlebnikov@yandex-team.ru>");
+MODULE_DESCRIPTION("Test module to generate lockups");