topic Re: process hangs in Operating System - HP-UX

process hangs

Nandan — Wed, 18 Oct 2000 19:33:50 GMT

Hi,

Sorry for the previous blank message.

I am running HP-UX 11.0. our application
frequently enters a priority level of 152 or 138 and then it hangs. After talking to HP support, i came to know that if process has a priority of < 154, it means process has gone into some unrecovrable kernel state. I cant kill this application. Only way to get rid of it is machine reboot !!

Last timne i debugged this with one of the HP support personnel and we found that just before process hanged it was accessing some nfs partition. My question is does anybody know the cause of this ? Why kernel goes into unrecovrable state ? How can I avoid it ?
How do I find out what is causing the application to hang ?

One more note, once the application hangs, I cannot do anything. I cant do 'tusc' on the process, neither could I attach it in the debugger.

I have to use nfs partition because invariably my executables are on NFS partition, I normally use local partition as my test directory.

Any help in this matter is greatly appreciated.

Thanks

Re: process hangs

Greg Hall — Wed, 18 Oct 2000 21:22:06 GMT

Dali,

I can't say much specific here, but can suggest some methods to diagnose the problem. As you suggest it may be NFS related, can you eliminate the NFS component, i.e. put the executables on the local system and test again? This may indicate if NFS is really the problem. Also verify your NFS setup is valid. Do you have enough biod and nfsd processes started? See /etc/rc.config.d/nfsconf. Is anything else using NFS to the same remote system successfully?
What is the application?

Greg.

Re: process hangs

Victor BERRIDGE — Thu, 19 Oct 2000 09:26:11 GMT

How are you patched?
PHNE_19620.KEY-CORE 1.0 NFS.KEY-CORE
PHNE_19620.NFS-CLIENT 1.0 NFS.NFS-CLIENT
PHNE_19620.NFS-CORE 1.0 NFS.NFS-CORE
PHNE_19620.NFS-ENG-A-MAN 1.0 NFS.NFS-ENG-A-MAN
PHNE_19620.NFS-KRN 1.0 NFS.NFS-KRN
PHNE_19620.NFS-PRG 1.0 NFS.NFS-PRG
PHNE_19620.NFS-SERVER 1.0 NFS.NFS-SERVER
PHNE_19620.NFS-SHLIBS 1.0 NFS.NFS-SHLIBS
PHNE_19620.NIS-CLIENT 1.0 NFS.NIS-CLIENT
PHNE_19620.NIS-CORE 1.0 NFS.NIS-CORE
PHNE_19620.NIS-SERVER 1.0 NFS.NIS-SERVER
PHNE_19620.NISPLUS-CORE 1.0 NFS.NISPLUS-CORE
# PHNE_19759 1.0 NFS Kernel General Release/Performance Patch
PHNE_19759.NFS-ENG-A-MAN 1.0 NFS.NFS-ENG-A-MAN
PHNE_19759.NFS-KRN 1.0 NFS.NFS-KRN
PHNE_19759.NFS-SERVER 1.0 NFS.NFS-SERVER

Now whe I have the same trouble as you it is usually because the server exporting the file system isnt responding for a while...
This can be because of network problems.