[pkg-ntp-maintainers] Bug#514318: lockfile can cause long startup delays, questionable benefit
martin f krafft
madduck at debian.org
Fri Feb 6 08:42:17 UTC 2009
Package: ntp
Version: 1:4.2.4p4+dfsg-8
Severity: normal
On a lenny system, whose DNS servers are broken right now, the ntp initscript
hangs for ~4 minutes, delaying the whole boot sequence.
Closer investigation shows that it idles in lock_ntpdate's invocation of
lockfile-create. I appreciate that it is trying to play nicely with e.g.
/etc/network/if-up.d/ntpdate (for which I also enabled trace in the output
below), but this kind of deadlock seems really unnecessary:
[...]
Will now mount local filesystems:.
Will now activate swapfile swap:done.
Cleaning /tmp...done.
Cleaning /var/run...done.
Cleaning /var/lock...done.
Checking minimum space in /tmp...done.
Setting up resolvconf...done.
Setting up networking....
Configuring network interfaces...+ exit 0
+ set -e
+ PATH=/sbin:/bin:/usr/sbin:/usr/bin
+ '[' loopback = static ']'
+ '[' loopback = loopback ']'
+ exit 0
+ exit 0
+ set -e
+ PATH=/sbin:/bin:/usr/sbin:/usr/bin
+ '[' static = static ']'
+ OPTS=-b
+ '[' static = loopback ']'
+ '[' '!' -x /usr/sbin/ntpdate-debian ']'
+ '[' -r /lib/udev/hotplug.functions ']'
+ . /lib/udev/hotplug.functions
++ FIRMWARE_DIRS='/lib/firmware /usr/local/lib/firmware
/usr/lib/hotplug/firmware'
++ EVENTS_DIR=/dev/.events
++ MODPROBE='/sbin/modprobe -s -q'
++ PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
INIT: Entering runlevel: 2
Starting watchdog keepalive daemon: wd_keepalive.
Starting system logging: syslog-ng.
Starting OpenBSD Secure Shell server: sshd.
Not starting internet superserver: no services enabled.
Starting Postfix Mail Transport Agent: postfix.
Starting S.M.A.R.T. daemon: smartd.
Starting puppet configuration management tool.
+ PATH=/sbin:/bin:/usr/sbin:/usr/bin
+ . /lib/lsb/init-functions
++ FANCYTTY=
++ '[' -e /etc/lsb-base-logging.sh ']'
++ true
+ NAME=ntp
+ DAEMON=/usr/sbin/ntpd
+ PIDFILE=/var/run/ntpd.pid
+ test -x /usr/sbin/ntpd
+ '[' -r /etc/default/ntp ']'
+ . /etc/default/ntp
++ NTPD_OPTS=-g
+ '[' -e /etc/ntp.conf.dhcp ']'
+ LOCKFILE=/var/lock/ntpdate
+ RUNASUSER=ntp
++ getent passwd ntp
++ cut -f 3,4 -d:
+ UGID=106:107
+ case $1 in
+ log_daemon_msg 'Starting NTP server' ntpd
+ '[' -z 'Starting NTP server' ']'
+ log_daemon_msg_pre 'Starting NTP server' ntpd
+ :
+ '[' -z ntpd ']'
+ echo -n 'Starting NTP server: ntpd'
Starting NTP server: ntpd+ log_daemon_msg_post 'Starting NTP server' ntpd
+ :
+ '[' -z 106:107 ']'
+ lock_ntpdate
+ '[' -x /usr/bin/lockfile-create ']'
+ lockfile-create /var/lock/ntpdate
[3 minutes here, then resumes...]
lockfile creation failed
+ lockfile-touch /var/lock/ntpdate
+ LOCKTOUCHPID=2455
+ start-stop-daemon --start --quiet --oknodo --pidfile /var/run/ntpd.pid --startas /usr/sbin/ntpd -- -pg
+ status=0
+ unlock_ntpdate
+ '[' -x /usr/bin/lockfile-create ']'
+ kill 2455
+ lockfile-remove /var/lock/ntpdate
+ log_end_msg 0
+ '[' -z 0 ']'
+ retval=0
+ log_end_msg_pre 0
+ :
+ log_use_fancy_output
+ TPUT=/usr/bin/tput
+ EXPR=/usr/bin/expr
+ '[' -t 1 ']'
+ '[' xlinux '!=' '' ']'
+ '[' xlinux '!=' xdumb ']'
+ '[' -x /usr/bin/tput ']'
+ '[' -x /usr/bin/expr ']'
+ /usr/bin/tput hpa 60
+ /usr/bin/tput setaf 1
+ '[' -z ']'
+ FANCYTTY=1
+ case "$FANCYTTY" in
+ true
++ /usr/bin/tput setaf 1
+ RED=''
++ /usr/bin/tput setaf 3
+ YELLOW=''
++ /usr/bin/tput op
+ NORMAL=''
+ '[' 0 -eq 0 ']'
+ echo .
.
+ log_end_msg_post 0
+ :
+ return 0
Starting MD monitoring service: mdadm --monitor.
Starting ftp server: proftpd.
Starting deferred execution scheduler: atd.
Starting periodic command scheduler: crond.
Stopping watchdog keepalive daemon:
Starting watchdog daemon: watchdog.
Starting web server: apache2.
Starting authentication failure monitor: fail2ban.
Running local boot scripts (/etc/rc.local).
Stopping boot logger: bootlogd
[...]
After a while, the following is then printed to the console:
+ :
+ '[' -x /usr/bin/lockfile-create ']'
+ kill 2182
/etc/network/if-up.d/ntpdate: line 45: kill: (2187) - No such process
So it seems that the root cause is ntpdate's inability to deal with
broken DNS (separate bug report to be filed).
At the time the boot finally completed, ntpdate and ntpd were both
running, which makes me question the point of the lockfile. The
initscript really ought not to hold up the whole boot sequence, even
if ntpdate has a problem.
-- System Information:
Debian Release: 5.0
APT prefers unstable
APT policy: (500, 'unstable'), (500, 'testing'), (1, 'experimental')
Architecture: amd64 (x86_64)
Kernel: Linux 2.6.26-1-amd64 (SMP w/1 CPU core)
Locale: LANG=en_GB, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages ntp depends on:
ii adduser 3.110 add and remove users and groups
ii libc6 2.7-18 GNU C Library: Shared libraries
ii libcap1 1:1.10-14 support for getting/setting POSIX.
ii libedit2 2.11~20080614-1 BSD editline and history libraries
ii libncurses5 5.7+20090124-1 shared libraries for terminal hand
ii libssl0.9.8 0.9.8g-15 SSL shared libraries
ii lsb-base 3.2-20 Linux Standard Base 3.2 init scrip
ii netbase 4.34 Basic TCP/IP networking system
Versions of packages ntp recommends:
ii perl 5.10.0-19 Larry Wall's Practical Extraction
Versions of packages ntp suggests:
pn ntp-doc <none> (no description available)
-- no debconf information
--
.''`. martin f. krafft <madduck at d.o> Related projects:
: :' : proud Debian developer http://debiansystem.info
`. `'` http://people.debian.org/~madduck http://vcs-pkg.org
`- Debian - when you have better things to do than fixing systems
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