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05-11-2007 01:50 AM
05-11-2007 01:50 AM
We have a situation whereby our SAP system got itself into a state and was not functioning as it should. They have tried to kill the application but two processes simply would not die. If I do an lsof on the processes there are numerous open files and network connections in established states. Apparently as the processes will not die this is an OS issue. I am reluctant to agree on this being the case and would assume its the application code. Anyone got any thought on this?
Adam
Solved! Go to Solution.
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05-11-2007 01:55 AM
05-11-2007 01:55 AM
Re: Blame the Sysadmin!!! Processes won't die
This can happen if the process is waiting on I/O that will not complete (like a bad disk).
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05-11-2007 02:46 AM
05-11-2007 02:46 AM
SolutionI presume you have tried to kill the processes with different signals, i.e kill -15
Can I guess and say that the parent process ID is 1. As said in the previous comment the reason these processes will not die is that they are normally in a sleep state and until they wake, they will not receive the kill signal. Whether this is an OS issue or an application issue, I find it is impossible to tell, you will always applications people blaming the OS and the sysadmins blaming the application. As I am in the sysadmin camp, I always blame the application, as its the application which is hung and the rest of the OS is working fine.
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05-11-2007 02:54 AM
05-11-2007 02:54 AM
Re: Blame the Sysadmin!!! Processes won't die
The OS is handling signals exactly as advertised so there is nothing to fix but you need to monitor your system for failed
i/o devices. You may be missing a few critical patches as well.
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05-11-2007 04:54 AM
05-11-2007 04:54 AM
Re: Blame the Sysadmin!!! Processes won't die
If you think you've found a socket open that belongs to this hung process, there are ways to release that socket which often will free the process from it's state of unresponsiveness.
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05-11-2007 05:53 AM
05-11-2007 05:53 AM
Re: Blame the Sysadmin!!! Processes won't die
As Clay said, this is not an OS issue but a design failure, possibly because of an architectural design rather than specific code. For instance, running SAP or a big database over the open Internet is asking for program hangs like this, not to mention that all the data is now at risk.
Bill Hassell, sysadmin
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05-11-2007 08:09 AM
05-11-2007 08:09 AM
Re: Blame the Sysadmin!!! Processes won't die
Just in case of a "zombie" the only solution is called "reboot".
Hope this helps!
Regards
Torsten.
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05-11-2007 09:27 AM
05-11-2007 09:27 AM
Re: Blame the Sysadmin!!! Processes won't die
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05-11-2007 04:51 PM
05-11-2007 04:51 PM
Re: Blame the Sysadmin!!! Processes won't die
I've recently had those several kill -9s finally kill the process. Fortunately there was a clearcase patch for the issue.
>Torsten: Just in case of a "zombie" the only solution is called "reboot".
You kill zombies by teaching their parent a lesson and kill them. Of course you have to judge if this is worse than waiting to reboot.