[Bug 805423] Re: pam_motd needs a module option to disable in-line dynamic updates

[Andreas Hasenack]

If you can reproduce it at least some times, I have some suggestions:
- hack the script to only run if you login as a certain user. In that way, you can trigger it by logging in as, say, "ubuntu", and don't run if you login as someone else. Something like this (untested):

--- /usr/share/landscape/landscape-sysinfo.wrapper	2012-06-13 18:10:15.000000000 -0300
+++ landscape-sysinfo.wrapper	2012-07-18 09:21:29.868717152 -0300
@@ -2,6 +2,10 @@
 cores=$(grep -c ^processor /proc/cpuinfo 2>/dev/null)
 [ "$cores" -eq "0" ] && cores=1
 threshold="${cores:-1}.0"
+if [ "$USER" = "safeuser" ]; then
+    echo "Not running landscape-sysinfo because logging in as user 'safeuser'"
+    exit 0
+fi
 if [ $(echo "`cut -f1 -d ' ' /proc/loadavg` < $threshold" | bc) -eq 1 ]; then
     echo
     echo -n "  System information as of "

Then you can observe what happens when it stalls.

You could also use the above plus strace the landscape-sysinfo script,
but that *may* prevent the bug from happening. Something like this:

--- /usr/share/landscape/landscape-sysinfo.wrapper	2012-06-13 18:10:15.000000000 -0300
+++ landscape-sysinfo.wrapper	2012-07-18 09:22:56.466115731 -0300
@@ -2,12 +2,16 @@
 cores=$(grep -c ^processor /proc/cpuinfo 2>/dev/null)
 [ "$cores" -eq "0" ] && cores=1
 threshold="${cores:-1}.0"
+if [ "$USER" = "safeuser" ]; then
+    echo "Not running landscape-sysinfo because logging in as user 'safeuser'"
+    exit 0
+fi
 if [ $(echo "`cut -f1 -d ' ' /proc/loadavg` < $threshold" | bc) -eq 1 ]; then
     echo
     echo -n "  System information as of "
     /bin/date
     echo
-    /usr/bin/landscape-sysinfo
+    strace -f -o /tmp/sysinfo.strace /usr/bin/landscape-sysinfo
 else
     echo
     echo " System information disabled due to load higher than $threshold"

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https://bugs.launchpad.net/bugs/805423

Title:
  pam_motd needs a module option to disable in-line dynamic updates

Status in Landscape Client:
  New
Status in “pam” package in Ubuntu:
  Fix Released

Bug description:
  1) lsb_release -rd
  Description:	Ubuntu 10.04.2 LTS
  Release:	10.04

  2)  Installiert: 1.1.1-2ubuntu5.3
    Kandidat: 1.1.1-2ubuntu5.3
    Versions-Tabelle:
   *** 1.1.1-2ubuntu5.3 0
          500 http://de.archive.ubuntu.com/ubuntu/ lucid-updates/main Packages
          500 http://security.ubuntu.com/ubuntu/ lucid-security/main Packages
          100 /var/lib/dpkg/status
       1.1.1-2ubuntu2 0
          500 http://de.archive.ubuntu.com/ubuntu/ lucid/main Packages

  3) Login on systems with high load/a lot of io wait via ssh should
  still be possible.

  4) On servers with high load or a lot of io wait login times out,
  because pam_motd does io intensive calculations. This hurts even more
  when using nagios check_by_ssh. There should be a way to use a cron
  job again (like update-motd did). Logging into a system is more
  important than motd.

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