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I had my first ever Crash of Debian 8.5 yesterday. I had many processes active (Google Chrome 52.x, Matlab 2016a, ...), and the system crashed suddenly: screen dark; no user action accepted; no TTY switch possible; only option to restart.

I would like to collect the logs to study it further. My ideas

  • dmesg | grep but how to get specific intervals
  • log/ directory exists somewhere in /

Testing GAD3R's answer

Studying the command journalctl --since yesterday

  • Errors when doing journalctl --since yesterday | grep error | less

     Oct 01 16:30:40 masi kernel: tpm_crb: probe of MSFT0101:00 failed with error -16
     Oct 01 16:30:40 masi kernel: EXT4-fs (sda2): re-mounted. Opts: errors=remount-ro
     Oct 01 16:30:40 masi kernel: iwlwifi 0000:01:00.0: Direct firmware load for iwlwifi-7265D-21.ucode failed with error -2
     ...
     Oct 01 16:30:41 masi apache2[1053]: The Apache error log may have more information.
     Oct 01 16:30:42 masi gdm-Xorg-:0[1427]: (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
     Oct 01 16:30:53 masi org.a11y.Bus[1599]: g_dbus_connection_real_closed: Remote peer vanished with error: Underlying GIOStream returned 0 bytes on an async read (g-io-error-quark, 0). Exiting.
     ...
     Oct 01 16:30:53 masi gnome-session[1595]: g_dbus_connection_real_closed: Remote peer vanished with error: Underlying GIOStream returned 0 bytes on an async read (g-io-error-quark, 0). Exiting.
     Oct 01 16:30:53 masi ca.desrt.dconf[1599]: g_dbus_connection_real_closed: Remote peer vanished with error: Underlying GIOStream returned 0 bytes on an async read (g-io-error-quark, 0). Exiting.
     Oct 01 16:31:20 masi gnome-session[1775]: (tracker-extract:1960): Tracker-WARNING **: Task for 'file:///home/masi/Documents/(Compu.djvu' finished with error:
     Could not get any metadata for uri:'file:///1...1.djvu' and mime:'image/vnd.djvu'
     Could not get any metadata for uri:'file:///home/masi/Documents/Programming/CDC..1.svg' and mime:'image/svg+xml'
     Oct 01 16:31:20 masi gnome-session[1775]: (tracker-extract:1960): Tracker-WARNING **: Task for 'file:///home/masi/Documents/Physics/0441/r328_1.raw' finished with error: Could not get any metadata for
     Oct 02 15:45:21 masi gnome-session[1775]: (nm-applet:1964): libnm-glib-WARNING **: replace_settings: error updating connection /org/freedesktop/NetworkManager/Settings/6 settings: (1) ipv4.routes: 1. route is invalid
     ...
     Oct 02 15:54:28 masi org.freedesktop.Telepathy.AccountManager[1818]: (process:1906): libnm-glib-WARNING **: replace_settings: error updating connection /org/freedesktop/NetworkManager/Settings/6 settings: (1) ipv4.routes: 1. route is invalid
     ...           
     Oct 02 16:51:08 masi org.gtk.Private.UDisks2VolumeMonitor[1818]: index_parse.c:191: indx_parse(): error opening /media/masi/MasiWeek/BDMV/index.bdmv
     Oct 02 16:51:08 masi org.gtk.Private.UDisks2VolumeMonitor[1818]: index_parse.c:191: indx_parse(): error opening /media/masi/MasiWeek/BDMV/BACKUP/index.bdmv
     Oct 02 17:55:02 masi kernel: jxbrowser-chrom[26948]: segfault at 39 ip 00007ff33300d760 sp 00007fff715c0c38 error 6 in libjxbrowser-chromium-lib.so[7ff3322ea000+7676000]
     Oct 02 18:15:51 masi gnome-session[1775]: Gjs-Message: JS LOG: Received error from DBus search provider org.gnome.Photos.desktop during GetResultMetas: Gio.DBusError: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name :1.383 was not provided by any .service files
     Oct 02 23:00:24 masi org.gtk.vfs.Daemon[1818]: ** (process:2021): WARNING **: send_infos_cb: No such interface 'org.gtk.vfs.Enumerator' on object at path /org/gtk/vfs/client/enumerator/5 (g-dbus-error-quark, 19)
     ...
     Oct 02 23:08:49 masi org.gtk.vfs.Daemon[1818]: ** (process:2021): WARNING **: send_done_cb: No such interface 'org.gtk.vfs.Enumerator' on object at path /org/gtk/vfs/client/enumerator/9 (g-dbus-error-quark, 19)
    
  • Warnings of journalctl --since yesterday | grep warning | less

      Oct 01 16:30:42 masi gdm-Xorg-:0[1427]: (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
      Oct 01 17:05:24 masi gnome-session[1775]: Window manager warning: Invalid WM_TRANSIENT_FOR window 0x280002f specified for 0x2800038 ( ).
      Oct 02 22:23:32 masi gnome-session[1775]: Window manager warning: Window 0x2801c66 (HG_Peer_Of) sets an MWM hint indicating it isn't resizable, but sets min size 1 x 1 and max size 2147483647 x 2147483647; this doesn't make much sense.
      ... [thousands of this warning]
    
  • Outputs of root@masi:/home/# timedatectl status

          Local time: Sun 2016-10-02 23:15:57 EEST
      Universal time: Sun 2016-10-02 20:15:57 UTC
            RTC time: Sun 2016-10-02 20:15:57
           Time zone: Europe/Helsinki (EEST, +0300)
         NTP enabled: no
    NTP synchronized: no
     RTC in local TZ: no
          DST active: yes
     Last DST change: DST began at
                      Sun 2016-03-27 02:59:59 EET
                      Sun 2016-03-27 04:00:00 EEST
     Next DST change: DST ends (the clock jumps one hour backwards) at
                      Sun 2016-10-30 03:59:59 EEST
                      Sun 2016-10-30 03:00:00 EET
    

OS: Debian 8.5 64 bit
Linux kernel: 4.6 of backports set up as described in the thread here
Hardware: Asus Zenbook UX303UA

1

To collect Logs for Debian you can use the journalctl command with the yesterday option:

journalctl --since yesterday
  • 2
    Because you need to be root for that. If there is still nothing, then you have a non conventional installation with another logging demon or no demon at all. – JohnW Oct 2 '16 at 12:35
  • 1
    What is the output of timedatectl status ? – GAD3R Oct 2 '16 at 12:38
  • @GAD3R Please, see the body for the outputs. I tried to collect some samples of errors and warnings there. Please, say if you know some specific words which may have caused the sudden crash. - - There is s much which I should fix, but not sure how. So feel free to target other errors which may be relevant. – Léo Léopold Hertz 준영 Oct 2 '16 at 20:30

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