Comment 55 for bug 585765

This issue affects me as well. In fact once while writing this post :-/

Sometimes I am able to ssh into my machine to give it a graceful shutdown. Often I have to press the Reset button, which I hate. Even being able to open a ssh session does not necessarily mean that a "shutdown -r now" will work.

I cannot find anything inside my system logs either. Just a couple of zombie processes last time it froze, maybe this helps:

timo@ubuntu-server:~$ ps aux | grep -w Z | grep -v grep
root 1511 0.0 0.0 0 0 ? Z 08:47 0:00 [gdm-simple-slav] <defunct>
root 2893 0.0 0.0 0 0 ? Z< 09:14 0:00 [udevd] <defunct>
root 3088 0.0 0.0 0 0 ? Z< 09:14 0:00 [udevd] <defunct>
timo 4670 0.0 0.0 0 0 ? Z 09:26 0:00 [sshd] <defunct>
timo 4901 0.0 0.0 0 0 ? Z 09:29 0:00 [sshd] <defunct>
timo 4999 0.0 0.0 0 0 ? Z 09:32 0:00 [sshd] <defunct>

##########

System information report, generated by Sysinfo: 6/13/2010 10:00:57 AM
http://sourceforge.net/projects/gsysinfo

SYSTEM INFORMATION
 Running Ubuntu Linux, the Ubuntu 10.04 (lucid) release.
 GNOME: 2.30.0 (Ubuntu 2010-03-31)
 Kernel version: 2.6.32-22-server (#36-Ubuntu SMP Thu Jun 3 20:38:33 UTC 2010)
 GCC: 4.4.3 (x86_64-linux-gnu)
 Xorg: unknown (23 April 2010 05:11:46PM)
 Hostname: ubuntu-server
 Uptime: 0 days 0 h 12 min

CPU INFORMATION
 GenuineIntel, Intel(R) Core(TM)2 Quad CPU Q9550 @ 2.83GHz
 Number of CPUs: 4
 CPU clock currently at 2833.000 MHz with 6144 KB cache
 Numbering: family(6) model(23) stepping(10)
 Bogomips: 5666.97
 Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good aperfmperf pni dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm sse4_1 xsave lahf_lm tpr_shadow vnmi flexpriority

MEMORY INFORMATION
 Total memory: 3962 MB
 Total swap: 1951 MB

STORAGE INFORMATION
 SCSI device - scsi5
  Vendor: LITE-ON
  Model: DVD SOHD-167T
 SCSI device - scsi4
  Vendor: AMCC
  Model: 9650SE-4LP DISK

HARDWARE INFORMATION
MOTHERBOARD
 Host bridge
  Intel Corporation 4 Series Chipset DRAM Controller (rev 03)
  Subsystem: ASUSTeK Computer Inc. Device 82d3
 PCI bridge(s)
  Intel Corporation 4 Series Chipset PCI Express Root Port (rev 03)
  Intel Corporation 4 Series Chipset PCI Express Root Port (rev 03)
  Intel Corporation 82801JI (ICH10 Family) PCI Express Root Port 1
  Intel Corporation 82801JI (ICH10 Family) PCI Express Root Port 4
  Intel Corporation 82801JI (ICH10 Family) PCI Express Root Port 5
  Intel Corporation 82801JI (ICH10 Family) PCI Express Root Port 6
  Intel Corporation 82801 PCI Bridge (rev 90) (prog-if 01)
  NEC Corporation uPD720400 PCI Express - PCI/PCI-X Bridge (rev 06)
  NEC Corporation uPD720400 PCI Express - PCI/PCI-X Bridge (rev 06)
 USB controller(s)
  Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #4
  Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #5
  Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #6
  Intel Corporation 82801JI (ICH10 Family) USB2 EHCI Controller #2 (prog-if 20)
  Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #1
  Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #2
  Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #3
  Intel Corporation 82801JI (ICH10 Family) USB2 EHCI Controller #1 (prog-if 20)
 ISA bridge
  Intel Corporation 82801JIR (ICH10R) LPC Interface Controller
  Subsystem: ASUSTeK Computer Inc. Device 82d4
 IDE interface
  Marvell Technology Group Ltd. 88SE6121 SATA II Controller (rev b2) (prog-if 8f [Master SecP SecO PriP PriO])
  Subsystem: ASUSTeK Computer Inc. Device 8296

GRAPHIC CARD
 VGA controller
  nVidia Corporation NV44 [GeForce 6200 TurboCache(TM)] (rev a1)
  Subsystem: Micro-Star International Co., Ltd. Device 0271

SOUND CARD
 Multimedia controller
  Intel Corporation 82801JI (ICH10 Family) HD Audio Controller
  Subsystem: ASUSTeK Computer Inc. Device 8357

NETWORK
 Ethernet controller
  Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 02)
  Subsystem: ASUSTeK Computer Inc. Device 82c6