[PLUG] Unexpected machine reboot

Richard C. Steffens rsteff at comcast.net
Wed Apr 17 17:18:35 UTC 2013


On 04/17/2013 09:08 AM, King Beowulf wrote:
> Take a look at
> /var/log/messages

I don't seem to have /var/log/messages on Ubuntu 12.04. I have dmesg. 
When I run it with the -T option I see messages that begin with the time 
the system rebooted. I tried unzipping dmesg.1.gz, but that doesn't show 
time stamps. Is there some way to see the time stamps from the 
dmesg.x.gz files?

> /var/log/syslog

syslog.2 has several of these cron.hourly entries before this one. It 
looks like 11:06:42 is when the machine rebooted.

Apr 15 10:17:01 Gateway-32-E-4500D CRON[10671]: (root) CMD (   cd / && 
run-parts --report /etc/cron.hourly)
Apr 15 10:39:01 Gateway-32-E-4500D CRON[10710]: (root) CMD (  [ -x 
/usr/lib/php5/maxlifetime ] && [ -d /var/lib/php5 ] && find /v
ar/lib/php5/ -depth -mindepth 1 -maxdepth 1 -type f -cmin 
+$(/usr/lib/php5/maxlifetime) ! -execdir fuser -s {} 2>/dev/null \; -de
lete)
Apr 15 11:06:42 Gateway-32-E-4500D kernel: imklog 5.8.6, log source = 
/proc/kmsg started.
Apr 15 11:06:42 Gateway-32-E-4500D rsyslogd: [origin software="rsyslogd" 
swVersion="5.8.6" x-pid="476" x-info="http://www.rsyslog
.com"] start

> the reboot could be (1) thermal (overheating) (2) hardware issue: cpu,
> mobo, add on card...

The video card is the only add on card in the machine. The nVidia X 
Server Settings tool shows the temperature fluctuating between 46 and 46 
degrees C. From other reading I've done, folks don't seem to get worried 
until that temp runs up to 90 something C.

> At this pt, I'd check over heating since you had a lot of stuff
> running. You can check cpu and mobo temps etc with any number of
> utilities. You can use BOINC (seti at home etc) as a stress test.

Now something seems to be wrong with the Ubuntu Software Center tool. I 
tried installing Psensor to look at the CPU temp. The progress bar is 
just about halfway, but the install is hung. There doesn't seem to be a 
way to halt the installation. Quitting the Ubuntu Software Center tool 
doesn't stop the install process. I tried ps ax, but can't tell which 
process to kill.

14789 ?        SNl    0:11 /usr/bin/python /usr/sbin/aptd
14890 pts/3    SNs+   0:00 /usr/bin/python /usr/sbin/aptd
14892 pts/3    ZN+    0:00 [dpkg] <defunct>
14893 pts/3    SN+    0:00 /bin/sh -c /usr/sbin/dpkg-preconfigure --apt 
|| true
14894 pts/3    SN+    0:00 /usr/bin/perl -w /usr/sbin/dpkg-preconfigure 
--apt
14896 pts/3    ZN+    0:00 [dpkg-preconfigu] <defunct>
14898 ?        Sl     0:00 /usr/bin/perl -w /usr/bin/debconf-communicate
14914 pts/3    SN+    0:00 /bin/sh /tmp/hddtemp.config.148971 configure
14948 ?        S      0:00 [kworker/0:1]
15077 ?        S      0:00 [kworker/0:2]
15171 ?        S      0:00 [kworker/0:0]
15188 pts/4    Ss     0:00 bash
15242 pts/4    R+     0:00 ps ax

I'm guessing it would be 14914, but don' t know whether some of the ones 
involving dpkg should be killed as well.

> Is the CPU heatsink loose?

I'll have to check that, but I don't think so.

> When was the last time you reseated it with fresh thermal paste?

Never. I haven't heard of this being recommended/necessary.

Thanks for your thoughts.

-- 
Regards,

Dick Steffens




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