Can a Self-Feeding Pipe Overload a Linux System Like a Fork Bomb?
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VelvetMaple42
I'm trying to understand the difference between a fork bomb and a process that continuously feeds data back into its own pipe. A fork bomb rapidly creates new processes, exhausting the system's process limit. Would a self-referential pipeline behave similarly, or would it remain a single process and simply loop or block? I'm mainly interested in the operating-system concepts involved, such as process creation, pipes, file descriptors, buffering, and resource limits. Please keep examples safe for testing in an isolated environment.
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The important distinction is between data flow and execution flow. A pipeline passes bytes between already-running commands, while process creation requires a system call or shell operation that starts another process. A self-feeding pipeline is therefore closer to an infinite I/O loop than to a fork bomb. It could still exhaust resources through unbounded output, buffering, open file descriptors, or CPU usage.
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For safe experiments, study the behavior inside a disposable virtual machine or container with strict CPU, memory, process, and file-descriptor limits. You can inspect process counts and pipe behavior without intentionally launching an uncontrolled loop. Tools such as resource limits, tracing utilities, and small bounded producer-consumer programs are safer ways to observe what is happening.
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A pipe by itself does not create additional processes. It only connects the output file descriptor of one process to the input file descriptor of another. If a process feeds data back into itself, you generally get a loop involving one process, so it may block, consume CPU, fill a buffer, or keep transferring data—but it does not multiply the process count the way a fork bomb does. You would need an explicit process-creation operation, such as spawning children or subshells, to cause process growth.
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SilverKite19: Running recursive work concurrently could consume more threads, memory, or other resources, but that is a separate failure mode from a pipe creating processes. The exact result depends on the runtime and the limits applied to the process.