うるう秒挿入メッセージの出力時にシステムがハングアップする

Issue

• うるう秒が挿入された後にシステムがハングアップし、以下のようなトレースが出力されます。

#0  ktime_get_ts (ts=0xffffffff8158bb30) at include/asm/processor.h:691
#1  0xffffffff8104c09a in ktime_get () at kernel/hrtimer.c:59
#2  0xffffffff8102a39a in hrtick_start_fair (rq=0xffff810009013880, 
    p=<value optimized out>) at kernel/sched.c:1064
#3  0xffffffff8102decc in enqueue_task_fair (rq=0xffff810009013880, 
    p=0xffff81003fb02d40, wakeup=1) at kernel/sched_fair.c:863
#4  0xffffffff81029a08 in enqueue_task (rq=0xffffffff8158bb30, 
    p=0xffff81003b8ac418, wakeup=-994836480) at kernel/sched.c:1550
#5  0xffffffff81029a39 in activate_task (rq=0xffff810009013880, 
    p=0xffff81003b8ac418, wakeup=20045) at kernel/sched.c:1614
#6  0xffffffff8102be38 in try_to_wake_up (p=0xffff81003fb02d40, 
    state=<value optimized out>, sync=0) at kernel/sched.c:2173
#7  0xffffffff8102be9c in default_wake_function (curr=<value optimized out>, 
    mode=998949912, sync=20045, key=0x4c4b40000) at kernel/sched.c:4366
#8  0xffffffff810492ed in autoremove_wake_function (wait=0xffffffff8158bb30, 
    mode=998949912, sync=20045, key=0x4c4b40000) at kernel/wait.c:132
#9  0xffffffff810296a2 in __wake_up_common (q=0xffffffff813d3180, mode=1, 
    nr_exclusive=1, sync=0, key=0x0) at kernel/sched.c:4387
#10 0xffffffff8102b97b in __wake_up (q=0xffffffff813d3180, mode=1, 
    nr_exclusive=1, key=0x0) at kernel/sched.c:4406
#11 0xffffffff8103692f in wake_up_klogd () at kernel/printk.c:1005
#12 0xffffffff81036abb in release_console_sem () at kernel/printk.c:1051
#13 0xffffffff81036fd1 in vprintk (fmt=<value optimized out>, 
    args=<value optimized out>) at kernel/printk.c:789
#14 0xffffffff81037081 in printk (
    fmt=0xffffffff8158bb30 "yj$\201????\2008\001\t") at kernel/printk.c:613
#15 0xffffffff8104ec16 in ntp_leap_second (timer=<value optimized out>)
    at kernel/time/ntp.c:143
#16 0xffffffff8104b7a6 in run_hrtimer_pending (cpu_base=0xffff81000900f740)
    at kernel/hrtimer.c:1204
#17 0xffffffff8104b86a in run_hrtimer_softirq (h=<value optimized out>)
    at kernel/hrtimer.c:1355
#18 0xffffffff8103b31f in __do_softirq () at kernel/softirq.c:234
#19 0xffffffff8100d52c in call_softirq () at include/asm/current_64.h:10
#20 0xffffffff8100ed5e in do_softirq () at arch/x86/kernel/irq_64.c:262
#21 0xffffffff8103b280 in irq_exit () at kernel/softirq.c:310
#22 0xffffffff8101b0fe in smp_apic_timer_interrupt (regs=<value optimized out>)
    at arch/x86/kernel/apic_64.c:514
#23 0xffffffff8100cf52 in apic_timer_interrupt ()
    at include/asm/current_64.h:10
#24 0xffff81003b9d5a90 in ??()
#25 0x0000000000000000 in ??()