Can a process wait on another process, that is not one's child?
Issue
As per a vmcore analysis it appears that process A waits (using wait4()) on process B, but process B is not a child of process A. Instead, process B is a child of process C. At the same time, processes A and C belong to the same thread group.
As per the man page of waitpid(2), the -ECHILD error is expected to be returned if the process specified is not a child of the calling process.
Environment
- Red Hat Enterprise Linux (RHEL)
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