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[dino99 <1297678@xxxxxxxxxxxxxxxxxx>]

Support for this version has ended

** Changed in: apt (Ubuntu)
       Status: Confirmed => Invalid

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https://bugs.launchpad.net/bugs/1297678

Title:
  When /etc/cron.daily/apt upgrades apache2 it gets run-parts stuck
  forever in select() instead of going on to the next script

Status in apt package in Ubuntu:
  Invalid

Bug description:
  When unattended-upgrades are enabled and the daily apt cron script
  upgrades apache2, somehow it ends up making run-parts stuck forever in
  select([6]), where 6 is the read side of a pipe, the other end of
  which is held by all apache processes.

  
  Here's the story:

  I got an email from cron, saying that it tried to start anacron at
  7:30 this morning but couldn't, because

      start: Job is already running: anacron

  So I ssh in and look around.  Here's what I see:

      # pstree -aup $(pidof anacron)
      anacron,5405 -s
        └─sh,5408 -c nice run-parts --report /etc/cron.daily
            └─run-parts,5410 --report /etc/cron.daily
                └─(apt,5417)

      # strace -p 5410
      select(7, [6], NULL, NULL, NULL

      # lsof -p 5410
      run-parts 5410 root    6r  FIFO    0,8      0t0 274237 pipe

      # lsof | grep 274237
      run-parts  5410          root    6r     FIFO                0,8      0t0     274237 pipe
      apache2   17943          root   40w     FIFO                0,8      0t0     274237 pipe
      apache2   17945      www-data   40w     FIFO                0,8      0t0     274237 pipe
      apache2   17946      www-data   40w     FIFO                0,8      0t0     274237 pipe
      apache2   17947      www-data   40w     FIFO                0,8      0t0     274237 pipe

      # ps -o pid,lstart,cmd 5405 5408 5410 5417 17943 17945 17946 17947
        PID                  STARTED CMD
       5405 Tue Mar 25 07:30:01 2014 anacron -s
       5408 Tue Mar 25 07:35:01 2014 /bin/sh -c nice run-parts --report /etc/cron.daily
       5410 Tue Mar 25 07:35:01 2014 run-parts --report /etc/cron.daily
       5417 Tue Mar 25 07:35:01 2014 [apt] <defunct>
      17943 Tue Mar 25 07:59:48 2014 /usr/sbin/apache2 -k start
      17945 Tue Mar 25 07:59:48 2014 /usr/sbin/apache2 -k start
      17946 Tue Mar 25 07:59:48 2014 /usr/sbin/apache2 -k start
      17947 Tue Mar 25 07:59:48 2014 /usr/sbin/apache2 -k start

      # pgrep apache2
      17943
      17945
      17946
      17947

      # less /var/log/syslog
      Mar 25 07:30:01 muskatas anacron[5405]: Anacron 2.3 started on 2014-03-25
      Mar 25 07:30:01 muskatas anacron[5405]: Will run job `cron.daily' in 5 min.
      Mar 25 07:30:01 muskatas anacron[5405]: Will run job `cron.weekly' in 10 min.
      Mar 25 07:30:01 muskatas anacron[5405]: Jobs will be executed sequentially
      Mar 25 07:31:55 muskatas ntpd[3288]: kernel time sync status change 6001
      Mar 25 07:35:01 muskatas anacron[5405]: Job `cron.daily' started
      Mar 25 07:35:01 muskatas anacron[5413]: Updated timestamp for job `cron.daily' to 2014-03-25

  I also got an email from unattended-upgrades dated 07:59:54, saying
  that it successfully upgraded and restarted apache2, which explains
  the STARTED times.

  I've no idea why run-parts is waiting for file descriptor 6, or why
  apache is holding the other end of it (but not writing anything
  there).

  This is the second time this happens, on the same Ubuntu 10.04 LTS
  server.  The first time was in 2012.

  ProblemType: Bug
  DistroRelease: Ubuntu 10.04
  Package: apt 0.7.25.3ubuntu9.14
  ProcVersionSignature: Ubuntu 2.6.32-57.119-generic 2.6.32.61+drm33.26
  Uname: Linux 2.6.32-57-generic x86_64
  Architecture: amd64
  Date: Wed Mar 26 09:57:36 2014
  ProcEnviron:
   LC_CTYPE=lt_LT.UTF-8
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: apt

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