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Allow several rcu_barrier() calls when waiting for memory reclamation

Arаm Sаrgsyаn requested to merge 4607-mem-outstanding-memory-allocations into main

There is a possiblity that the call_rcu() callback for which the rcu_barrier() was waiting for doesn't free up any resources, in which case the code breaks from the loop and could leave some nested callbacks still running.

Allow a sane amount of such nested callbacks before giving up.

Closes #4607

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