Ignore "Software caused connection abort" error from accept(2)
system call. This is normal behavior in this test.

reported by anton@; OK mvs@

Alternatively to close(2) the sysctl(2) of tcpdrop(1) is tested.
This happens while other threads accept, connect, send, and recv.

Spawn multiple threads and run system calls on TCP socket in parallel.

Setup TCP connections on localhost and run system calls connect(2),
accept(2), send(2), recv(2), and close(2) in parallel. In

Spawn multiple threads and run system calls on TCP socket in parallel.

Setup TCP connections on localhost and run system calls connect(2),
accept(2), send(2), recv(2), and close(2) in parallel. In addition
multi threaded stress test for socket splicing, unsplice, max length
and idle timeout can run. The successful operations are counted.

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