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Weird random reboot -- thinkpad x220



Hi Guys,

Today returned home from work, saw that instead of X on my laptop virtual
console is opened.  That pretty amused me, -- almost never shutdown my laptop
if it stays home.  Looking into last command output I saw that a reboot
happened around 11:29 Apr 28:

__
sevenfou pts/1        :0               Mon Apr 28 19:23 - down   (00:31)    
sevenfou pts/0        :0               Mon Apr 28 19:21 - down   (00:32)    
root     tty3                          Mon Apr 28 19:21 - 19:30  (00:08)    
sevenfou pts/0        XXXXXXXXXXXXX    Mon Apr 28 15:56 - 16:38  (00:41)    
reboot   system boot  3.13-1-amd64     Mon Apr 28 11:29 - 19:54  (08:24)    
sevenfou pts/9        :0               Sun Apr 27 10:31 - 16:50  (06:18)    
sevenfou pts/9        :0               Sun Apr 27 01:26 - 01:36  (00:10)    
__


here is /var/log/syslog:
__
Apr 28 11:25:01 lefrat /USR/SBIN/CRON[28141]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)
Apr 28 11:25:16 lefrat kernel: [306970.108480] iptables denied: IN=wlan1 OUT= MAC=e0:94:67:0c:20:2c:54:04:a6:e8:1d:a4:08:00 SRC=173.194.39.132 DST=192.168.1.218 LEN=40 TOS=0x00 PREC=0x00 TTL=50 ID=43730 PROTO=TCP SPT=443 DPT=60021 WINDOW=0 RES=0x00 RST URGP=0 
Apr 28 11:25:16 lefrat kernel: [306970.109093] iptables denied: IN=wlan1 OUT= MAC=e0:94:67:0c:20:2c:54:04:a6:e8:1d:a4:08:00 SRC=173.194.39.132 DST=192.168.1.218 LEN=40 TOS=0x00 PREC=0x00 TTL=50 ID=43731 PROTO=TCP SPT=443 DPT=60021 WINDOW=0 RES=0x00 RST URGP=0 
Apr 28 11:25:16 lefrat kernel: [306970.109670] iptables denied: IN=wlan1 OUT= MAC=e0:94:67:0c:20:2c:54:04:a6:e8:1d:a4:08:00 SRC=173.194.39.132 DST=192.168.1.218 LEN=40 TOS=0x00 PREC=0x00 TTL=50 ID=43732 PROTO=TCP SPT=443 DPT=60021 WINDOW=0 RES=0x00 RST URGP=0 
Apr 28 11:27:01 lefrat /USR/SBIN/CRON[30771]: (root) CMD (/usr/local/sbin/batlow)
Apr 28 11:29:37 lefrat rsyslogd: [origin software="rsyslogd" swVersion="7.6.3" x-pid="2239" x-info="http://www.rsyslog.com";] start
Apr 28 11:29:37 lefrat kernel: [    0.000000] Initializing cgroup subsys cpuset
Apr 28 11:29:37 lefrat kernel: [    0.000000] Initializing cgroup subsys cpu
Apr 28 11:29:37 lefrat kernel: [    0.000000] Initializing cgroup subsys cpuacct
Apr 28 11:29:37 lefrat kernel: [    0.000000] Linux version 3.13-1-amd64 (debian-kernel@lists.debian.org) (gcc version 4.8.2 (Debian 4.8.2-16) ) #1 SMP Debian 3.13.10-1 (2014-04-15)
Apr 28 11:29:37 lefrat kernel: [    0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-3.13-1-amd64 root=/dev/sda1 ro
Apr 28 11:29:37 lefrat kernel: [    0.000000] Disabled fast string operations
Apr 28 11:29:37 lefrat kernel: [    0.000000] e820: BIOS-provided physical RAM map:
__


/var/log/debug:
__
Apr 28 11:25:16 lefrat kernel: [306970.108480] iptables denied: IN=wlan1 OUT= MAC=e0:94:67:0c:20:2c:54:04:a6:e8:1d:a4:08:00 SRC=173.194.39.132 DST=192.168.1.218 LEN=40 TO
S=0x00 PREC=0x00 TTL=50 ID=43730 PROTO=TCP SPT=443 DPT=60021 WINDOW=0 RES=0x00 RST URGP=0 
Apr 28 11:25:16 lefrat kernel: [306970.109093] iptables denied: IN=wlan1 OUT= MAC=e0:94:67:0c:20:2c:54:04:a6:e8:1d:a4:08:00 SRC=173.194.39.132 DST=192.168.1.218 LEN=40 TO
S=0x00 PREC=0x00 TTL=50 ID=43731 PROTO=TCP SPT=443 DPT=60021 WINDOW=0 RES=0x00 RST URGP=0 
Apr 28 11:25:16 lefrat kernel: [306970.109670] iptables denied: IN=wlan1 OUT= MAC=e0:94:67:0c:20:2c:54:04:a6:e8:1d:a4:08:00 SRC=173.194.39.132 DST=192.168.1.218 LEN=40 TO
S=0x00 PREC=0x00 TTL=50 ID=43732 PROTO=TCP SPT=443 DPT=60021 WINDOW=0 RES=0x00 RST URGP=0 
Apr 28 11:29:37 lefrat kernel: [    0.000000] DMI: LENOVO 4286CTO/4286CTO, BIOS 8DET69WW (1.39 ) 07/18/2013
Apr 28 11:29:37 lefrat kernel: [    0.000000] e820: update [mem 0x00000000-0x00000fff] usable ==> reserved
Apr 28 11:29:37 lefrat kernel: [    0.000000] e820: remove [mem 0x000a0000-0x000fffff] usable
Apr 28 11:29:37 lefrat kernel: [    0.000000] MTRR default type: uncachable
Apr 28 11:29:37 lefrat kernel: [    0.000000] MTRR fixed ranges enabled:
Apr 28 11:29:37 lefrat kernel: [    0.000000]   00000-9FFFF write-back
Apr 28 11:29:37 lefrat kernel: [    0.000000]   A0000-BFFFF uncachable
Apr 28 11:29:37 lefrat kernel: [    0.000000]   C0000-FFFFF write-protect
Apr 28 11:29:37 lefrat kernel: [    0.000000] MTRR variable ranges enabled:
__


/var/log/auth.log:
__
Apr 28 11:25:01 lefrat CRON[28140]: pam_unix(cron:session): session opened for user root by (uid=0)
Apr 28 11:25:01 lefrat CRON[28140]: pam_unix(cron:session): session closed for user root
Apr 28 11:27:01 lefrat CRON[30770]: pam_unix(cron:session): session opened for user root by (uid=0)
Apr 28 11:27:01 lefrat CRON[30770]: pam_unix(cron:session): session closed for user root
Apr 28 11:29:38 lefrat sshd[2527]: Server listening on 0.0.0.0 port xxxxx.
Apr 28 11:30:03 lefrat CRON[2635]: pam_unix(cron:session): session opened for user sevenfourk by (uid=0)
Apr 28 11:30:03 lefrat CRON[2633]: pam_unix(cron:session): session opened for user root by (uid=0)
Apr 28 11:30:03 lefrat CRON[2634]: pam_unix(cron:session): session opened for user sevenfourk by (uid=0)
Apr 28 11:30:03 lefrat CRON[2633]: pam_unix(cron:session): session closed for user root
__


Also there was no any power losses for sure:
__
Apr 28 11:18:01 /usr/local/sbin/batlow: Battery: Normal: 99%
Apr 28 11:21:01 /usr/local/sbin/batlow: Battery: Normal: 99%
Apr 28 11:24:01 /usr/local/sbin/batlow: Battery: Normal: 99%
Apr 28 11:27:01 /usr/local/sbin/batlow: Battery: Normal: 99%
Apr 28 11:30:03 /usr/local/sbin/batlow: Battery: Normal: 99%
Apr 28 11:33:01 /usr/local/sbin/batlow: Battery: Normal: 99%
__


Very strange, hopefully I'm not paranoid.  No one was at home at that time.
Maybe I'm missing something, maybe another log to check. I would be glad if
someone shares some thoughts on looking into details on reboot info.


Thanks,
Ivan.

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