Sysreq during system hang where ssh/screen still accessible.

Sysreq during system hang where ssh/screen still accessible.

[Mike Mestnik]

Hello,
   I have an unusual hang:
The box is responding to monitor wakeup key presses and putting the 
display to sleep after idle, however the screen is always blank.

 From the network side a previously started root ssh screen session can 
create more views,but the shell never starts, neither does ls from an 
existing shell.

I've configured remote logging and there is noting in any of the logs to 
indicate a problem, smart-tools is installed.

The remote log(over SCTP) is still connected and the IRC client is still 
connected.

Kernel messages are being logged, last msg from apparmor about empathy.

Key presses wake up monitor, but sysreq-s is not logging anything.

No further ssh shells able to check, but I don't think that dmesg would 
even start.

However ssh/screen is still responsive to create new views and switch 
views, but the shell never starts.

Feb 12 17:33:33: The only error is smatd: Prefailure: Spin_Up_Time (3) 
changed to: 197
Feb 13 12:54 AM an email http://pastebin.com/A8srcY7v
However nothing in the _remote_ log around 1AM/12:54.

Any thoughts?
linux-image-3.2.0-15-generic-pae
System specs.
http://pastebin.com/35NwE0G1

Just a failed drive. Was: Sysreq during system hang where ssh/screen still accessible.

[Mike Mestnik]

It's kind of odd that these are the symptoms of a failing disc.  I think 
perhaps syslog and others should be made to not swap??

This may also have something to do with my zram hack that re-mounts the 
zram swaps every 5min to flush them to disk.

On 02/13/2012 12:30 PM, Mike Mestnik wrote:
> Hello,
>   I have an unusual hang:
> The box is responding to monitor wakeup key presses and putting the 
> display to sleep after idle, however the screen is always blank.
>
> From the network side a previously started root ssh screen session can 
> create more views,but the shell never starts, neither does ls from an 
> existing shell.
>
> I've configured remote logging and there is noting in any of the logs 
> to indicate a problem, smart-tools is installed.
>
> The remote log(over SCTP) is still connected and the IRC client is 
> still connected.
>
> Kernel messages are being logged, last msg from apparmor about empathy.
>
> Key presses wake up monitor, but sysreq-s is not logging anything.
>
> No further ssh shells able to check, but I don't think that dmesg 
> would even start.
>
> However ssh/screen is still responsive to create new views and switch 
> views, but the shell never starts.
>
> Feb 12 17:33:33: The only error is smatd: Prefailure: Spin_Up_Time (3) 
> changed to: 197
> Feb 13 12:54 AM an email http://pastebin.com/A8srcY7v
> However nothing in the _remote_ log around 1AM/12:54.
>
> Any thoughts?
> linux-image-3.2.0-15-generic-pae
> System specs.
> http://pastebin.com/35NwE0G1
>