We had a generic process where the jobs are scheduled to run sequentially and in background. We are noticing the problems with the background jobs.
Error Message:
The same script is existing in bin and it had enough privileges to execute and this script is being called by both background and sequential jobs.
Weekly once or twice we notice background jobs failing with the mentioned error message (Not the same job every time).
What could be the reason for this failures? What else need to be checked or taken care in scripting?
You have not provided any information regarding your environment, nor have you provided the code of the scripts involved, nor the code that launches the scripts (a crontab, I presume). Although, even if you had, intermittent failures can be difficult to debug without access to the machine(s) in question.
Generally, speaking:
1. You could grep the source to your shell for all instances of 'cannot execute' and see what can trigger that error message.
2. You can modify the way the scripts are launched to enable tracing, and log the trace to a file by redirecting standard error.
3. If the filesystem on which the scripts reside is remote, perhaps you are experiencing intermittent failures on the network/fileserver.
Please post the actual permissions of the script.
And state the unix usernames (with group names) of the users which will execute this script.
Is there any simple pattern for the failure?
Is cron involved or are the background tasks invoked by some other method?
If it is a cron, please post the name of the user owning the cron and the whole line from crontab.
Fundamentals:
What Operating System are you running?
Do you have any diagnostic tools such as "sar"?
I strongly suspect that you are blowing a kernel parameter such as the maximum number of processes for one user.
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