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ERROR_PROCESS_IN_JOB
the specified process is already associated with a job object.
ERROR_PROCESS_IN_JOB identifies this condition: This status reports existing job membership. It matters because assignment rules, nested jobs, breakaway flags, and operating-system version determine whether another assignment is legal.
Where the result appears
- AssignProcessToJobObject.
- launchers that place child processes under limits.
- containers and application sandboxes.
- service hosts that inherit job membership.
What to collect
- current job membership and nesting level.
- creation flags such as CREATE_BREAKAWAY_FROM_JOB.
- job limit flags.
- parent process and launch token.
Handling and recovery
Inspect the existing job before attempting reassignment. Use supported nested-job behavior or intentional breakaway configuration rather than trying the same assignment repeatedly. If the existing job is expected, regard the status as confirmation and continue.
Common misinterpretation
The result does not identify the job or prove that its limits match the caller’s policy. A separate query is needed to understand the active restrictions.
References
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