kernel/watchdog.c: print traces for all cpus on lockup detection

A 'softlockup' is defined as a bug that causes the kernel to loop in
kernel mode for more than a predefined period to time, without giving
other tasks a chance to run.

Currently, upon detection of this condition by the per-cpu watchdog task,
debug information (including a stack trace) is sent to the system log.

On some occasions, we have observed that the "victim" rather than the
actual "culprit" (i.e.  the owner/holder of the contended resource) is
reported to the user.  Often this information has proven to be
insufficient to assist debugging efforts.

To avoid loss of useful debug information, for architectures which support
NMI, this patch makes it possible to improve soft lockup reporting.  This
is accomplished by issuing an NMI to each cpu to obtain a stack trace.

If NMI is not supported we just revert back to the old method.  A sysctl
and boot-time parameter is available to toggle this feature.

[dzickus@redhat.com: add CONFIG_SMP in certain areas]
Signed-off-by: Aaron Tomlin <atomlin@redhat.com>
Signed-off-by: Don Zickus <dzickus@redhat.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Mateusz Guzik <mguzik@redhat.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 43842177b771d72e67e90361f79b28966435787f..a28e8c918ab5d10eba46228fabfe0af3ef10797c 100644 (file)
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -3070,6 +3070,11 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
                        [KNL] Should the soft-lockup detector generate panics.
                        Format: <integer>
 
+       softlockup_all_cpu_backtrace=
+                       [KNL] Should the soft-lockup detector generate
+                       backtraces on all cpus.
+                       Format: <integer>
+
        sonypi.*=       [HW] Sony Programmable I/O Control Device driver
                        See Documentation/laptops/sonypi.txt
 

diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt
index 9886c3d57fc2ad82d002e3fe3edfa60584f8cdaa..c91d8dcffd3263ce41d3a83384d1dfdfb46abe06 100644 (file)
--- a/Documentation/sysctl/kernel.txt
+++ b/Documentation/sysctl/kernel.txt
@@ -75,6 +75,7 @@ show up in /proc/sys/kernel:
 - shmall
 - shmmax                      [ sysv ipc ]
 - shmmni
+- softlockup_all_cpu_backtrace
 - stop-a                      [ SPARC only ]
 - sysrq                       ==> Documentation/sysrq.txt
 - tainted
@@ -762,6 +763,22 @@ without users and with a dead originative process will be destroyed.
 
 ==============================================================
 
+softlockup_all_cpu_backtrace:
+
+This value controls the soft lockup detector thread's behavior
+when a soft lockup condition is detected as to whether or not
+to gather further debug information. If enabled, each cpu will
+be issued an NMI and instructed to capture stack trace.
+
+This feature is only applicable for architectures which support
+NMI.
+
+0: do nothing. This is the default behavior.
+
+1: on detection capture more debug information.
+
+==============================================================
+
 tainted:
 
 Non-zero if the kernel has been tainted.  Numeric values, which

diff --git a/include/linux/nmi.h b/include/linux/nmi.h
index a17ab6398d7c275765fce939c8c125d564938484..961b1773c44dcd4f02786117c4a2a451f4e903f2 100644 (file)
--- a/include/linux/nmi.h
+++ b/include/linux/nmi.h
@@ -57,6 +57,9 @@ int hw_nmi_is_cpu_stuck(struct pt_regs *);
 u64 hw_nmi_get_sample_period(int watchdog_thresh);
 extern int watchdog_user_enabled;
 extern int watchdog_thresh;
+#ifdef CONFIG_SMP
+extern int sysctl_softlockup_all_cpu_backtrace;
+#endif
 struct ctl_table;
 extern int proc_dowatchdog(struct ctl_table *, int ,
                           void __user *, size_t *, loff_t *);

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 74f5b580fe34904fa4d9bcb2790545a323367773..5e1b08490aa5d70ca193a57b450ec818f2846ccb 100644 (file)
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -849,6 +849,17 @@ static struct ctl_table kern_table[] = {
                .extra1         = &zero,
                .extra2         = &one,
        },
+#ifdef CONFIG_SMP
+       {
+               .procname       = "softlockup_all_cpu_backtrace",
+               .data           = &sysctl_softlockup_all_cpu_backtrace,
+               .maxlen         = sizeof(int),
+               .mode           = 0644,
+               .proc_handler   = proc_dointvec_minmax,
+               .extra1         = &zero,
+               .extra2         = &one,
+       },
+#endif /* CONFIG_SMP */
        {
                .procname       = "nmi_watchdog",
                .data           = &watchdog_user_enabled,

diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index 516203e665fcbddc8eb7f55fa7b5a2dd5634cfc5..0e78f08a090d2f253a1a7bafba0c590c70f53a9a 100644 (file)
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -31,6 +31,7 @@
 
 int watchdog_user_enabled = 1;
 int __read_mostly watchdog_thresh = 10;
+int __read_mostly sysctl_softlockup_all_cpu_backtrace;
 static int __read_mostly watchdog_running;
 static u64 __read_mostly sample_period;
 
@@ -47,6 +48,7 @@ static DEFINE_PER_CPU(bool, watchdog_nmi_touch);
 static DEFINE_PER_CPU(unsigned long, hrtimer_interrupts_saved);
 static DEFINE_PER_CPU(struct perf_event *, watchdog_ev);
 #endif
+static unsigned long soft_lockup_nmi_warn;
 
 /* boot commands */
 /*
@@ -95,6 +97,15 @@ static int __init nosoftlockup_setup(char *str)
 }
 __setup("nosoftlockup", nosoftlockup_setup);
 /*  */
+#ifdef CONFIG_SMP
+static int __init softlockup_all_cpu_backtrace_setup(char *str)
+{
+       sysctl_softlockup_all_cpu_backtrace =
+               !!simple_strtol(str, NULL, 0);
+       return 1;
+}
+__setup("softlockup_all_cpu_backtrace=", softlockup_all_cpu_backtrace_setup);
+#endif
 
 /*
  * Hard-lockup warnings should be triggered after just a few seconds. Soft-
@@ -271,6 +282,7 @@ static enum hrtimer_restart watchdog_timer_fn(struct hrtimer *hrtimer)
        unsigned long touch_ts = __this_cpu_read(watchdog_touch_ts);
        struct pt_regs *regs = get_irq_regs();
        int duration;
+       int softlockup_all_cpu_backtrace = sysctl_softlockup_all_cpu_backtrace;
 
        /* kick the hardlockup detector */
        watchdog_interrupt_count();
@@ -317,6 +329,17 @@ static enum hrtimer_restart watchdog_timer_fn(struct hrtimer *hrtimer)
                if (__this_cpu_read(soft_watchdog_warn) == true)
                        return HRTIMER_RESTART;
 
+               if (softlockup_all_cpu_backtrace) {
+                       /* Prevent multiple soft-lockup reports if one cpu is already
+                        * engaged in dumping cpu back traces
+                        */
+                       if (test_and_set_bit(0, &soft_lockup_nmi_warn)) {
+                               /* Someone else will report us. Let's give up */
+                               __this_cpu_write(soft_watchdog_warn, true);
+                               return HRTIMER_RESTART;
+                       }
+               }
+
                printk(KERN_EMERG "BUG: soft lockup - CPU#%d stuck for %us! [%s:%d]\n",
                        smp_processor_id(), duration,
                        current->comm, task_pid_nr(current));
@@ -327,6 +350,17 @@ static enum hrtimer_restart watchdog_timer_fn(struct hrtimer *hrtimer)
                else
                        dump_stack();
 
+               if (softlockup_all_cpu_backtrace) {
+                       /* Avoid generating two back traces for current
+                        * given that one is already made above
+                        */
+                       trigger_allbutself_cpu_backtrace();
+
+                       clear_bit(0, &soft_lockup_nmi_warn);
+                       /* Barrier to sync with other cpus */
+                       smp_mb__after_clear_bit();
+               }
+
                if (softlockup_panic)
                        panic("softlockup: hung tasks");
                __this_cpu_write(soft_watchdog_warn, true);