softlockup: automatically detect hung TASK_UNINTERRUPTIBLE tasks

this patch extends the soft-lockup detector to automatically
detect hung TASK_UNINTERRUPTIBLE tasks. Such hung tasks are
printed the following way:

 ------------------>
 INFO: task prctl:3042 blocked for more than 120 seconds.
 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message
 prctl         D fd5e3793     0  3042   2997
        f6050f38 00000046 00000001 fd5e3793 00000009 c06d8264 c06dae80 00000286
        f6050f40 f6050f00 f7d34d90 f7d34fc8 c1e1be80 00000001 f6050000 00000000
        f7e92d00 00000286 f6050f18 c0489d1a f6050f40 00006605 00000000 c0133a5b
 Call Trace:
  [<c04883a5>] schedule_timeout+0x6d/0x8b
  [<c04883d8>] schedule_timeout_uninterruptible+0x15/0x17
  [<c0133a76>] msleep+0x10/0x16
  [<c0138974>] sys_prctl+0x30/0x1e2
  [<c0104c52>] sysenter_past_esp+0x5f/0xa5
  =======================
 2 locks held by prctl/3042:
 #0:  (&sb->s_type->i_mutex_key#5){--..}, at: [<c0197d11>] do_fsync+0x38/0x7a
 #1:  (jbd_handle){--..}, at: [<c01ca3d2>] journal_start+0xc7/0xe9
 <------------------

the current default timeout is 120 seconds. Such messages are printed
up to 10 times per bootup. If the system has crashed already then the
messages are not printed.

if lockdep is enabled then all held locks are printed as well.

this feature is a natural extension to the softlockup-detector (kernel
locked up without scheduling) and to the NMI watchdog (kernel locked up
with IRQs disabled).

[ Gautham R Shenoy <ego@in.ibm.com>: CPU hotplug fixes. ]
[ Andrew Morton <akpm@linux-foundation.org>: build warning fix. ]

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>

1 files changed, 104 insertions, 10 deletions

diff --git a/kernel/softlockup.c b/kernel/softlockup.c
index 11df812263c8..02f0ad534441 100644
--- a/kernel/softlockup.c
+++ b/kernel/softlockup.c
@@ -8,6 +8,7 @@
  */
 #include <linux/mm.h>
 #include <linux/cpu.h>
+#include <linux/nmi.h>
 #include <linux/init.h>
 #include <linux/delay.h>
 #include <linux/freezer.h>
@@ -24,7 +25,7 @@ static DEFINE_PER_CPU(unsigned long, print_timestamp);
 static DEFINE_PER_CPU(struct task_struct *, watchdog_task);
 
 static int did_panic;
-int softlockup_thresh = 10;
+int softlockup_thresh = 60;
 
 static int
 softlock_panic(struct notifier_block *this, unsigned long event, void *ptr)
@@ -45,7 +46,7 @@ static struct notifier_block panic_block = {
  */
 static unsigned long get_timestamp(int this_cpu)
 {
-        return cpu_clock(this_cpu) >> 30;  /* 2^30 ~= 10^9 */
+        return cpu_clock(this_cpu) >> 30LL;  /* 2^30 ~= 10^9 */
 }
 
 void touch_softlockup_watchdog(void)
@@ -100,11 +101,7 @@ void softlockup_tick(void)
 
         now = get_timestamp(this_cpu);
 
-        /* Wake up the high-prio watchdog task every second: */
-        if (now > (touch_timestamp + 1))
-                wake_up_process(per_cpu(watchdog_task, this_cpu));
-
-        /* Warn about unreasonable 10+ seconds delays: */
+        /* Warn about unreasonable delays: */
         if (now <= (touch_timestamp + softlockup_thresh))
                 return;
 
@@ -122,11 +119,93 @@ void softlockup_tick(void)
 }
 
 /*
+ * Have a reasonable limit on the number of tasks checked:
+ */
+unsigned long sysctl_hung_task_check_count = 1024;
+
+/*
+ * Zero means infinite timeout - no checking done:
+ */
+unsigned long sysctl_hung_task_timeout_secs = 120;
+
+long sysctl_hung_task_warnings = 10;
+
+/*
+ * Only do the hung-tasks check on one CPU:
+ */
+static int check_cpu __read_mostly = -1;
+
+static void check_hung_task(struct task_struct *t, unsigned long now)
+{
+        unsigned long switch_count = t->nvcsw + t->nivcsw;
+
+        if (t->flags & PF_FROZEN)
+                return;
+
+        if (switch_count != t->last_switch_count || !t->last_switch_timestamp) {
+                t->last_switch_count = switch_count;
+                t->last_switch_timestamp = now;
+                return;
+        }
+        if ((long)(now - t->last_switch_timestamp) <
+                                        sysctl_hung_task_timeout_secs)
+                return;
+        if (sysctl_hung_task_warnings < 0)
+                return;
+        sysctl_hung_task_warnings--;
+
+        /*
+         * Ok, the task did not get scheduled for more than 2 minutes,
+         * complain:
+         */
+        printk(KERN_ERR "INFO: task %s:%d blocked for more than "
+                        "%ld seconds.\n", t->comm, t->pid,
+                        sysctl_hung_task_timeout_secs);
+        printk(KERN_ERR "\"echo 0 > /proc/sys/kernel/hung_task_timeout_secs\""
+                        " disables this message.\n");
+        sched_show_task(t);
+        __debug_show_held_locks(t);
+
+        t->last_switch_timestamp = now;
+        touch_nmi_watchdog();
+}
+
+/*
+ * Check whether a TASK_UNINTERRUPTIBLE does not get woken up for
+ * a really long time (120 seconds). If that happens, print out
+ * a warning.
+ */
+static void check_hung_uninterruptible_tasks(int this_cpu)
+{
+        int max_count = sysctl_hung_task_check_count;
+        unsigned long now = get_timestamp(this_cpu);
+        struct task_struct *g, *t;
+
+        /*
+         * If the system crashed already then all bets are off,
+         * do not report extra hung tasks:
+         */
+        if ((tainted & TAINT_DIE) || did_panic)
+                return;
+
+        read_lock(&tasklist_lock);
+        do_each_thread(g, t) {
+                if (!--max_count)
+                        break;
+                if (t->state & TASK_UNINTERRUPTIBLE)
+                        check_hung_task(t, now);
+        } while_each_thread(g, t);
+
+        read_unlock(&tasklist_lock);
+}
+
+/*
  * The watchdog thread - runs every second and touches the timestamp.
  */
 static int watchdog(void *__bind_cpu)
 {
         struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 };
+        int this_cpu = (long)__bind_cpu;
 
         sched_setscheduler(current, SCHED_FIFO, &param);
 
@@ -135,13 +214,18 @@ static int watchdog(void *__bind_cpu)
 
         /*
          * Run briefly once per second to reset the softlockup timestamp.
-         * If this gets delayed for more than 10 seconds then the
+         * If this gets delayed for more than 60 seconds then the
          * debug-printout triggers in softlockup_tick().
          */
         while (!kthread_should_stop()) {
-                set_current_state(TASK_INTERRUPTIBLE);
                 touch_softlockup_watchdog();
-                schedule();
+                msleep_interruptible(10000);
+
+                if (this_cpu != check_cpu)
+                        continue;
+
+                if (sysctl_hung_task_timeout_secs)
+                        check_hung_uninterruptible_tasks(this_cpu);
         }
 
         return 0;
@@ -171,6 +255,7 @@ cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu)
                 break;
         case CPU_ONLINE:
         case CPU_ONLINE_FROZEN:
+                check_cpu = any_online_cpu(cpu_online_map);
                 wake_up_process(per_cpu(watchdog_task, hotcpu));
                 break;
 #ifdef CONFIG_HOTPLUG_CPU
@@ -181,6 +266,15 @@ cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu)
                 /* Unbind so it can run.  Fall thru. */
                 kthread_bind(per_cpu(watchdog_task, hotcpu),
                              any_online_cpu(cpu_online_map));
+        case CPU_DOWN_PREPARE:
+        case CPU_DOWN_PREPARE_FROZEN:
+                if (hotcpu == check_cpu) {
+                        cpumask_t temp_cpu_online_map = cpu_online_map;
+
+                        cpu_clear(hotcpu, temp_cpu_online_map);
+                        check_cpu = any_online_cpu(temp_cpu_online_map);
+                }
+                break;
         case CPU_DEAD:
         case CPU_DEAD_FROZEN:
                 p = per_cpu(watchdog_task, hotcpu);