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When an interrupt occurs for which the process was waiting the OS should start executing the process. If the process isn't waiting for anything and there isn't anything for it to do, it might not start executing. Many processes in LINUX use a send/receive/reply IPC protocol. If the process is waiting for an IPC message from something else and has no timeout associated with the wait, it could effectively wait forever. In general, that's considered an error in programming.

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Q: How can a sleeping process wake up in Linux?
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