Raspberry Pi / Linux - ntp cron job导致100％cpu（/etc/cron.daily/ntp)

Question

我正在使用Raspberry Pi 3。有时，名为ntp的进程实际上是/etc/cron.daily/ntp，导致 100％cpu使用数小时和数天，直到我通过命令停止进程。似乎它一直停滞不前。

top看起来像这样：

  PID USER      PR  NI  VIRT  RES  SHR S  %CPU %MEM    TIME+  COMMAND           
25706 root      20   0  3852 1028  856 R  97.8  0.1   3580:45 ntp   

/etc/cron.daily/ntp文件本身看起来像这样。我认为它可能是RaspberryPi添加到系统中的，所以我也发布了这段代码。

#!/bin/sh

# The default Debian ntp.conf enables logging of various statistics to
# the /var/log/ntpstats directory.  The daemon automatically changes
# to a new datestamped set of files at midnight, so all we need to do
# is delete old ones, and compress the ones we're keeping so disk
# usage is controlled.

statsdir=$(cat /etc/ntp.conf | grep -v '^#' | sed -n 's/statsdir \([^ ][^ ]*\)/\1/p')

if [ -n "$statsdir" ] && [ -d "$statsdir" ]; then
    # only keep a week's depth of these
    find "$statsdir" -type f -mtime +7 -exec rm {} \;

    # compress whatever is left to save space
    cd "$statsdir"
    ls *stats.???????? > /dev/null 2>&1
    if [ $? -eq 0 ]; then
        # Note that gzip won't compress the file names that
        # are hard links to the live/current files, so this
        # compresses yesterday and previous, leaving the live
        # log alone.  We supress the warnings gzip issues
        # about not compressing the linked file.
        gzip --best --quiet *stats.???????? 
        return=$?
        case $return in
            2)
            exit 0          # squash all warnings
            ;;
            *)
            exit $return        # but let real errors through
            ;;
        esac
    fi
fi

问题出在哪里？任何帮助将不胜感激！