Comment 22 for bug 223421

Ok, i have had a look in the /var/log/messages log and received a load of these messages about the time that the crash/hung state occurred.

Jul 17 12:11:20 sy001428 kernel: [15502.322506] SysRq : HELP : loglevel(0-9) reBoot Crashdump terminate-all-tasks(E) memory-full-oom-kill(F) kill-all-tasks(I) saK show-backtrace-all-active-cpus(L) show-memory-usage(M) nice-all-RT-tasks(N) powerOff show-registers(P) show-all-timers(Q) unRaw Sync show-task-states(T) Unmount show-blocked-tasks(W) dumpZ-ftrace-buffer

I have no idea what this means, however i'm sure its not good.

After these messages i removed then reinserted my USB mouse receiver which was correctly picked up in the log and identified properly, so it proves that the machine is still active in the background. It has also picked up a load of btnx commands sent from the mouse. I assume the restart at the end is the result of holding the power button down.

Jul 17 12:11:36 sy001428 kernel: [15518.272068] usb 2-1: USB disconnect, address 2
Jul 17 12:11:37 sy001428 kernel: [15520.000024] usb 2-1: new full speed USB device using uhci_hcd and address 3
Jul 17 12:11:37 sy001428 kernel: [15520.184762] usb 2-1: configuration #1 chosen from 1 choice
Jul 17 12:11:37 sy001428 kernel: [15520.192797] input: Logitech USB Receiver as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1:1.0/input/input43
Jul 17 12:11:38 sy001428 kernel: [15520.244115] generic-usb 0003:046D:C51A.0003: input,hidraw0: USB HID v1.11 Mouse [Logitech USB Receiver] on usb-0000:00:1d.0-1/input0
Jul 17 12:11:38 sy001428 kernel: [15520.251387] input: Logitech USB Receiver as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1:1.1/input/input44
Jul 17 12:11:38 sy001428 kernel: [15520.292170] generic-usb 0003:046D:C51A.0004: input,hiddev96,hidraw1: USB HID v1.11 Device [Logitech USB Receiver] on usb-0000:00:1d.0-1/input1
Jul 17 12:11:40 sy001428 kernel: [15523.169490] input: btnx keyboard as /devices/virtual/input/input45
Jul 17 12:11:41 sy001428 kernel: [15523.269132] input: btnx mouse as /devices/virtual/input/input46
Jul 17 12:11:41 sy001428 kernel: [15523.368534] input: btnx keyboard as /devices/virtual/input/input47
Jul 17 12:11:41 sy001428 kernel: [15523.368971] input: btnx keyboard as /devices/virtual/input/input48
Jul 17 12:11:41 sy001428 kernel: [15523.377477] input: btnx keyboard as /devices/virtual/input/input49
Jul 17 12:11:41 sy001428 kernel: [15523.416136] input: btnx mouse as /devices/virtual/input/input50
Jul 17 12:11:41 sy001428 kernel: [15523.421470] input: btnx keyboard as /devices/virtual/input/input51
Jul 17 12:11:41 sy001428 kernel: [15523.483108] input: btnx mouse as /devices/virtual/input/input52
Jul 17 12:11:41 sy001428 kernel: [15523.547808] input: btnx mouse as /devices/virtual/input/input53
Jul 17 12:11:41 sy001428 kernel: [15523.613848] input: btnx mouse as /devices/virtual/input/input54
Jul 17 12:13:23 sy001428 syslogd 1.5.0#5ubuntu3: restart.

Any insight into the Sysreq messages would be great.
Thanks