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Re: start-stop-daemon can't stop process



[for anyone reading this in the BTS, Ian is responding to
http://lists.debian.org/debian-dpkg/2007/08/msg00024.html]

On Tue August 28 2007 05:27:52 am Ian Jackson wrote:
> Bruce Sass writes ("start-stop-daemon can't stop process"):
> > I have an exim4 daemon (bug #396944) which doesn't stop...
>
> The exim4 binary on disk has been changed and now the running program
> doesn't have the same binary as is on disk.
>
> This was probably because you upgraded exim4 but the exim4 maintainer
> scripts should have arranged to stop the daemon before the upgrade.

The exim4 maintainer scripts do stop the daemon before unpacking,
s-s-d failed at that point. Here is the debug output of the attempt...

Preparing to replace exim4-config 4.67-7 (using .../exim4-config_4.67-8_all.deb) ...
Unpacking replacement exim4-config ...
now debugging /var/lib/dpkg/info/exim4-config.postrm upgrade 4.67-8
+ [ upgrade = purge ]
Preparing to replace exim4-base 4.67-7 (using .../exim4-base_4.67-8_i386.deb) ...
Unpacking replacement exim4-base ...
now debugging /var/lib/dpkg/info/exim4-base.postrm upgrade 4.67-8
+ [ upgrade = purge ]
Preparing to replace exim4-daemon-light 4.67-7 (using .../exim4-daemon-light_4.67-8_i386.deb) ...
now debugging /var/lib/dpkg/info/exim4-daemon-light.prerm upgrade 4.67-8
+ [ -x /etc/init.d/exim4 ]
+ [ -n 1 ]
+ netstat -tulpen
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       User       Inode      PID/Program name
tcp        0      0 127.0.0.1:2208          0.0.0.0:*               LISTEN     0          2909928    13195/hpiod
tcp        0      0 0.0.0.0:2049            0.0.0.0:*               LISTEN     0          2488620    -
tcp        0      0 0.0.0.0:24837           0.0.0.0:*               LISTEN     1000       5323638    697/knotes
tcp        0      0 0.0.0.0:57638           0.0.0.0:*               LISTEN     0          2488669    18734/rpc.mountd
tcp        0      0 0.0.0.0:5800            0.0.0.0:*               LISTEN     1000       5323696    640/kded [kdeinit]
tcp        0      0 0.0.0.0:5900            0.0.0.0:*               LISTEN     1000       5323702    640/kded [kdeinit]
tcp        0      0 127.0.0.1:56204         0.0.0.0:*               LISTEN     107        2909964    13198/python
tcp        0      0 0.0.0.0:59853           0.0.0.0:*               LISTEN     0          2333       -
tcp        0      0 0.0.0.0:111             0.0.0.0:*               LISTEN     0          1728804    31135/portmap
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN     0          3133       1407/boa
tcp        0      0 0.0.0.0:6001            0.0.0.0:*               LISTEN     0          5322993    589/X
tcp        0      0 0.0.0.0:113             0.0.0.0:*               LISTEN     0          3575       1740/inetd
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN     0          704876     19851/sshd
tcp        0      0 127.0.0.1:631           0.0.0.0:*               LISTEN     0          3555360    13218/cupsd
tcp        0      0 0.0.0.0:39095           0.0.0.0:*               LISTEN     0          2487874    18045/rpc.statd
tcp        0      0 0.0.0.0:25              0.0.0.0:*               LISTEN     0          3441       1685/exim4
tcp        0      0 0.0.0.0:57146           0.0.0.0:*               LISTEN     1000       5323496    685/artsd
tcp        0      0 0.0.0.0:7741            0.0.0.0:*               LISTEN     0          2790100    4393/lisa
udp        0      0 0.0.0.0:2049            0.0.0.0:*                          0          2488619    -
udp        0      0 0.0.0.0:32770           0.0.0.0:*                          0          3503       -
udp        0      0 0.0.0.0:517             0.0.0.0:*                          0          2790848    1740/inetd
udp        0      0 0.0.0.0:518             0.0.0.0:*                          0          2790867    1740/inetd
udp        0      0 127.0.0.1:161           0.0.0.0:*                          0          797911     31565/snmpd
udp        0      0 0.0.0.0:177             0.0.0.0:*                          0          4207       1940/kdm
udp        0      0 0.0.0.0:7741            0.0.0.0:*                          0          2790423    4393/lisa
udp        0      0 0.0.0.0:60225           0.0.0.0:*                          0          2487871    18045/rpc.statd
udp        0      0 0.0.0.0:60226           0.0.0.0:*                          0          2488664    18734/rpc.mountd
udp        0      0 0.0.0.0:68              0.0.0.0:*                          0          2210       924/dhclient
udp        0      0 0.0.0.0:837             0.0.0.0:*                          0          2487862    18045/rpc.statd
udp        0      0 0.0.0.0:36704           0.0.0.0:*                          114        2607656    9308/avahi-daemon:
udp        0      0 0.0.0.0:5353            0.0.0.0:*                          114        2607655    9308/avahi-daemon:
udp        0      0 127.0.0.1:3049          0.0.0.0:*                          0          4073       1881/cfsd
udp        0      0 0.0.0.0:111             0.0.0.0:*                          0          1728803    31135/portmap
udp        0      0 0.0.0.0:631             0.0.0.0:*                          0          3555363    13218/cupsd
udp        0      0 192.168.0.255:123       0.0.0.0:*                          0          3114817    13551/ntpd
udp        0      0 127.0.0.1:123           0.0.0.0:*                          0          3114777    13551/ntpd
udp        0      0 192.168.0.102:123       0.0.0.0:*                          0          3114776    13551/ntpd
udp        0      0 0.0.0.0:123             0.0.0.0:*                          0          3114774    13551/ntpd
+ ls -al /var/run/exim4/
total 5
drwxr-x---  2 Debian-exim Debian-exim   72 Jul 26 01:55 .
drwxrwxr-x 23 root        staff       1192 Aug 24 02:54 ..
-rw-r--r--  1 root        Debian-exim    5 Jul 26 01:55 exim.pid
+ cat /var/run/exim4/exim.pid
1685
+ pidof exim4
1685
+ command -v invoke-rc.d
+ invoke-rc.d exim4 stop
now debugging /etc/init.d/exim4 stop
+ ENV=env -i LANG=C PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/bin/X11
+ QUEUERUNNER=combined
+ QUEUEINTERVAL=30m
+ UPEX4OPTS=
+ PIDFILE=/var/run/exim4/exim.pid
+ QRPIDFILE=/var/run/exim4/eximqr.pid
+ [ -f /etc/default/exim4 ]
+ . /etc/default/exim4
+ EX4DEF_VERSION=
+ QUEUERUNNER=combined
+ QUEUEINTERVAL=30m
+ COMMONOPTIONS=
+ QUEUERUNNEROPTIONS=
+ QFLAGS=
+ SMTPLISTENEROPTIONS=
+ [ -f /etc/inetd.conf ]
+ grep -E -q ^[[:space:]]*((\*|[[:alnum:].-]+):)?smtp /etc/inetd.conf
+ DAEMON=/usr/sbin/exim4
+ NAME=exim4
+ test -x /usr/lib/exim4/exim4
+ log_daemon_msg Stopping MTA
+ [ -z Stopping MTA ]
+ [ -z  ]
+ echo -n Stopping MTA:
Stopping MTA:+ return
+ stop_exim
+ [ -f /var/run/exim4/eximqr.pid ]
+ [ -f /var/run/exim4/exim.pid ]
+ start-stop-daemon --stop --oknodo --pidfile /var/run/exim4/exim.pid --oknodo --retry 30 --exec /usr/sbin/exim4
No /usr/sbin/exim4 found running; none killed.
+ log_progress_msg exim4_listener
+ [ -z exim4_listener ]
+ echo -n  exim4_listener
 exim4_listener+ rm -f /var/run/exim4/eximqr.pid /var/run/exim4/exim.pid
+ log_end_msg 0
+ [ -z 0 ]
+ log_use_fancy_output
+ TPUT=/usr/bin/tput
+ EXPR=/usr/bin/expr
+ [ xxterm != xdumb ]
+ [ -x /usr/bin/tput ]
+ [ -x /usr/bin/expr ]
+ /usr/bin/tput hpa 60
+ /usr/bin/tput setaf 1
+ [ -z ]
+ FANCYTTY=1
+ true
+ /usr/bin/tput setaf 1
+ RED=
+ /usr/bin/tput op
+ NORMAL=
+ [ 0 -eq 0 ]
+ echo .
.
+ return 0
+ warn_paniclog
+ [ -s /var/log/exim4/paniclog ]
+ exit 0
+ [ -n 1 ]
+ netstat -tulpen
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       User       Inode      PID/Program name
tcp        0      0 127.0.0.1:2208          0.0.0.0:*               LISTEN     0          2909928    13195/hpiod
tcp        0      0 0.0.0.0:2049            0.0.0.0:*               LISTEN     0          2488620    -
tcp        0      0 0.0.0.0:24837           0.0.0.0:*               LISTEN     1000       5323638    697/knotes
tcp        0      0 0.0.0.0:57638           0.0.0.0:*               LISTEN     0          2488669    18734/rpc.mountd
tcp        0      0 0.0.0.0:5800            0.0.0.0:*               LISTEN     1000       5323696    640/kded [kdeinit]
tcp        0      0 0.0.0.0:5900            0.0.0.0:*               LISTEN     1000       5323702    640/kded [kdeinit]
tcp        0      0 127.0.0.1:56204         0.0.0.0:*               LISTEN     107        2909964    13198/python
tcp        0      0 0.0.0.0:59853           0.0.0.0:*               LISTEN     0          2333       -
tcp        0      0 0.0.0.0:111             0.0.0.0:*               LISTEN     0          1728804    31135/portmap
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN     0          3133       1407/boa
tcp        0      0 0.0.0.0:6001            0.0.0.0:*               LISTEN     0          5322993    589/X
tcp        0      0 0.0.0.0:113             0.0.0.0:*               LISTEN     0          3575       1740/inetd
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN     0          704876     19851/sshd
tcp        0      0 127.0.0.1:631           0.0.0.0:*               LISTEN     0          3555360    13218/cupsd
tcp        0      0 0.0.0.0:39095           0.0.0.0:*               LISTEN     0          2487874    18045/rpc.statd
tcp        0      0 0.0.0.0:25              0.0.0.0:*               LISTEN     0          3441       1685/exim4
tcp        0      0 0.0.0.0:57146           0.0.0.0:*               LISTEN     1000       5323496    685/artsd
tcp        0      0 0.0.0.0:7741            0.0.0.0:*               LISTEN     0          2790100    4393/lisa
udp        0      0 0.0.0.0:2049            0.0.0.0:*                          0          2488619    -
udp        0      0 0.0.0.0:32770           0.0.0.0:*                          0          3503       -
udp        0      0 0.0.0.0:517             0.0.0.0:*                          0          2790848    1740/inetd
udp        0      0 0.0.0.0:518             0.0.0.0:*                          0          2790867    1740/inetd
udp        0      0 127.0.0.1:161           0.0.0.0:*                          0          797911     31565/snmpd
udp        0      0 0.0.0.0:177             0.0.0.0:*                          0          4207       1940/kdm
udp        0      0 0.0.0.0:7741            0.0.0.0:*                          0          2790423    4393/lisa
udp        0      0 0.0.0.0:60225           0.0.0.0:*                          0          2487871    18045/rpc.statd
udp        0      0 0.0.0.0:60226           0.0.0.0:*                          0          2488664    18734/rpc.mountd
udp        0      0 0.0.0.0:68              0.0.0.0:*                          0          2210       924/dhclient
udp        0      0 0.0.0.0:837             0.0.0.0:*                          0          2487862    18045/rpc.statd
udp        0      0 0.0.0.0:36704           0.0.0.0:*                          114        2607656    9308/avahi-daemon:
udp        0      0 0.0.0.0:5353            0.0.0.0:*                          114        2607655    9308/avahi-daemon:
udp        0      0 127.0.0.1:3049          0.0.0.0:*                          0          4073       1881/cfsd
udp        0      0 0.0.0.0:111             0.0.0.0:*                          0          1728803    31135/portmap
udp        0      0 0.0.0.0:631             0.0.0.0:*                          0          3555363    13218/cupsd
udp        0      0 192.168.0.255:123       0.0.0.0:*                          0          3114817    13551/ntpd
udp        0      0 127.0.0.1:123           0.0.0.0:*                          0          3114777    13551/ntpd
udp        0      0 192.168.0.102:123       0.0.0.0:*                          0          3114776    13551/ntpd
udp        0      0 0.0.0.0:123             0.0.0.0:*                          0          3114774    13551/ntpd
+ ls -al /var/run/exim4/
total 1
drwxr-x---  2 Debian-exim Debian-exim   48 Aug 24 02:59 .
drwxrwxr-x 23 root        staff       1192 Aug 24 02:54 ..
+ cat /var/run/exim4/exim.pid
cat: /var/run/exim4/exim.pid: No such file or directory
dpkg: warning - old pre-removal script returned error exit status 1
dpkg - trying script from the new package instead ...
now debugging /var/lib/dpkg/tmp.ci/prerm failed-upgrade 4.67-7
dpkg: ... it looks like that went OK.
Unpacking replacement exim4-daemon-light ...
Preparing to replace exim4 4.67-7 (using .../archives/exim4_4.67-8_all.deb) ...
Unpacking replacement exim4 ...

...and...

$ dpkg -S /usr/sbin/exim4
exim4-daemon-light: /usr/sbin/exim4


Hmm, here's a mystery to me...

ps reports the exim4 daemon to be process 1685,
and s-s-d finds 1685 to be /usr/sbin/.nfs00035c1d000000a3
[see the debian-dpkg post mentioned at the top of this message]

$ ls -l /usr/sbin/.nfs00035c1d000000a3
-rwsr-xr-x 1 root root 672764 Jul 14 01:42 /usr/sbin/.nfs00035c1d000000a3

# zgrep "exim4-daemon-light" dpkg.log*
dpkg.log:2007-08-24 02:59:01 upgrade exim4-daemon-light 4.67-7 4.67-8
...
dpkg.log.1:2007-07-17 00:40:24 upgrade exim4-daemon-light 4.67-5 4.67-7
...
dpkg.log.2.gz:2007-06-18 22:15:10 upgrade exim4-daemon-light 4.67-1 4.67-3
...

$ ls -l /var/log/dmesg
-rw-r--r-- 1 root adm 14642 Jul 26 01:55 dmesg

So, /usr/sbin/exim4 changed on disk prior to the previous (successful,
2007-07-17) upgrade and it survived a reboot.

...wtf? I've never been sure of what the .nfs* files are, but
/etc/cron.daily/chkrootkit makes note of those it finds and I've noticed
it never finds any immediately after a reboot---so it is a little surprising
to discover one apparently older than the last reboot.

> Looking at the bug report I think Marc Haber's explanation is
> plausible.  I don't think there's evidence of a bug in
> start-stop-daemon.

Ya, Marc asked me if there was any correlation between the lsb-base bug and
exim4 upgrade failures. After looking at snapshot.debian.net/lsb-base I was
able to say the problem did start after the killproc() code in
lsb_3.1-8.tar.gz/init-functions started to change towards buggy.

This most recent failure has ocurred with the apparently fixed -24 build of
lsb-base installed; which would indicate that either lsb isn't really fixed,
or the problem lies elsewhere.

How should we go about debugging this...
more detailed info about the exim4 process at upgrade time?
strace start-stop-daemon in the exim4 maintainer script?
something else?


- Bruce



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