computer freezes completely

[Omar Ocegueda]

Im running Ubuntu 13.10 saucy on a Dell Inspiron 15R 5521. The computer completely freezes with no aparent reason. After looking at the log, the following message appears consistently just before the crash:

wpa_supplicant[1085]: wlan0: WPA: Group rekeying completed with 84:c9:b2:d3:b2:89 [GTK=CCMP]

These are the log messages around the crash (manually forced restart at 19:59:52):

Mar 16 19:28:22 pina wpa_supplicant[1085]: wlan0: WPA: Group rekeying completed with 84:c9:b2:d3:b2:89 [GTK=CCMP]
Mar 16 19:29:05 pina whoopsie[1076]: online
Mar 16 19:29:06 pina whoopsie[1076]: online
Mar 16 19:35:02 pina whoopsie[1076]: online
Mar 16 19:37:02 pina whoopsie[1076]: online
Mar 16 19:38:07 whoopsie[1076]: last message repeated 3 times
Mar 16 19:38:08 pina whoopsie[1076]: online
Mar 16 19:38:22 pina wpa_supplicant[1085]: wlan0: WPA: Group rekeying completed with 84:c9:b2:d3:b2:89 [GTK=CCMP]
Mar 16 19:38:46 pina whoopsie[1076]: online
Mar 16 19:39:59 whoopsie[1076]: last message repeated 2 times
Mar 16 19:42:09 pina whoopsie[1076]: online
Mar 16 19:44:09 pina whoopsie[1076]: online
Mar 16 19:44:10 pina whoopsie[1076]: online
Mar 16 19:47:10 pina whoopsie[1076]: online
Mar 16 19:48:11 whoopsie[1076]: last message repeated 3 times
Mar 16 19:48:22 pina wpa_supplicant[1085]: wlan0: WPA: Group rekeying completed with 84:c9:b2:d3:b2:89 [GTK=CCMP]
Mar 16 19:48:40 pina whoopsie[1076]: online
Mar 16 19:49:59 whoopsie[1076]: last message repeated 2 times
Mar 16 19:51:16 pina whoopsie[1076]: online
Mar 16 19:51:17 pina whoopsie[1076]: online
Mar 16 19:56:23 pina whoopsie[1076]: online
Mar 16 19:57:13 pina whoopsie[1076]: online
Mar 16 19:59:52 pina kernel: imklog 5.8.11, log source = /proc/kmsg started.
Mar 16 19:59:52 pina rsyslogd: [origin software="rsyslogd" swVersion="5.8.11" x-pid="753" x-info="http://www.rsyslog.com"] start
Mar 16 19:59:52 pina rsyslogd: rsyslogd's groupid changed to 103
Mar 16 19:59:52 pina rsyslogd: rsyslogd's userid changed to 101
Mar 16 19:59:52 pina rsyslogd-2039: Could not open output pipe '/dev/xconsole' [try http://www.rsyslog.com/e/2039 ]

I don't know if the following is useful but if I see the log in a text editor, I can see a lot of "NULL" characters, something like:

Mar 16 19:28:22 pina wpa_supplicant[1085]: wlan0: WPA: Group rekeying completed with 84:c9:b2:d3:b2:89 [GTK=CCMP]
Mar 16 19:29:05 pina whoopsie[1076]: online
Mar 16 19:29:06 pina whoopsie[1076]: online
Mar 16 19:35:02 pina whoopsie[1076]: online
Mar 16 19:37:02 pina whoopsie[1076]: online
Mar 16 19:38:07 whoopsie[1076]: last message repeated 3 times
Mar 16 19:38:08 pina whoopsie[1076]: online
Mar 16 19:38:22 pina wpa_supplicant[1085]: wlan0: WPA: Group rekeying completed with 84:c9:b2:d3:b2:89 [GTK=CCMP]
Mar 16 19:38:46 pina whoopsie[1076]: online
Mar 16 19:39:59 whoopsie[1076]: last message repeated 2 times
Mar 16 19:42:09 pina whoopsie[1076]: online
Mar 16 19:44:09 pina whoopsie[1076]: online
Mar 16 19:44:10 pina whoopsie[1076]: online
Mar 16 19:47:10 pina whoopsie[1076]: online
Mar 16 19:48:11 whoopsie[1076]: last message repeated 3 times
Mar 16 19:48:22 pina wpa_supplicant[1085]: wlan0: WPA: Group rekeying completed with 84:c9:b2:d3:b2:89 [GTK=CCMP]
Mar 16 19:48:40 pina whoopsie[1076]: online
Mar 16 19:49:59 whoopsie[1076]: last message repeated 2 times
Mar 16 19:51:16 pina whoopsie[1076]: online
Mar 16 19:51:17 pina whoopsie[1076]: online
Mar 16 19:56:23 pina whoopsie[1076]: online
Mar 16 19:57:13 pina whoopsie[1076]: online
NULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLNULLMar 16 19:59:52 pina kernel: imklog 5.8.11, log source = /proc/kmsg started.
Mar 16 19:59:52 pina rsyslogd: [origin software="rsyslogd" swVersion="5.8.11" x-pid="753" x-info="http://www.rsyslog.com"] start
Mar 16 19:59:52 pina rsyslogd: rsyslogd's groupid changed to 103
Mar 16 19:59:52 pina rsyslogd: rsyslogd's userid changed to 101
Mar 16 19:59:52 pina rsyslogd-2039: Could not open output pipe '/dev/xconsole' [try http://www.rsyslog.com/e/2039 ]

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