diff options
Diffstat (limited to 'kernel/watchdog_hld.c')
| -rw-r--r-- | kernel/watchdog_hld.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/kernel/watchdog_hld.c b/kernel/watchdog_hld.c index 4ece6028007a..210dccc57c04 100644 --- a/kernel/watchdog_hld.c +++ b/kernel/watchdog_hld.c @@ -24,6 +24,8 @@ static DEFINE_PER_CPU(bool, hard_watchdog_warn); static DEFINE_PER_CPU(bool, watchdog_nmi_touch); static DEFINE_PER_CPU(struct perf_event *, watchdog_ev); static DEFINE_PER_CPU(struct perf_event *, dead_event); +static DEFINE_RAW_SPINLOCK(watchdog_output_lock); + static struct cpumask dead_events_mask; static unsigned long hardlockup_allcpu_dumped; @@ -134,6 +136,13 @@ static void watchdog_overflow_callback(struct perf_event *event, /* only print hardlockups once */ if (__this_cpu_read(hard_watchdog_warn) == true) return; + /* + * If early-printk is enabled then make sure we do not + * lock up in printk() and kill console logging: + */ + printk_kill(); + + raw_spin_lock(&watchdog_output_lock); pr_emerg("Watchdog detected hard LOCKUP on cpu %d", this_cpu); print_modules(); @@ -151,6 +160,7 @@ static void watchdog_overflow_callback(struct perf_event *event, !test_and_set_bit(0, &hardlockup_allcpu_dumped)) trigger_allbutself_cpu_backtrace(); + raw_spin_unlock(&watchdog_output_lock); if (hardlockup_panic) nmi_panic(regs, "Hard LOCKUP"); |