raiden00pl opened a new pull request, #20552:
URL: https://github.com/apache/nuttx/pull/20552
## Summary
net/tcp: reuse closing connections also with CONFIG_NET_SOLINGER.
When the connection pool is empty, tcp_alloc() frees the oldest
closing or TIME_WAIT connection, but only without
CONFIG_NET_SOLINGER. The guard protected a close() that blocked
waiting for the close callback. Since 0636c17 ("net/tcp: wave
hands on background") close() returns at once also with SO_LINGER
(it only sets the linger timeout), and tcp_free() cancels the pending
close work and the timer.
With CONFIG_NET_SOLINGER, a node that closes its connections first
ran out of TCP connections once CONFIG_NET_TCP_PREALLOC_CONNS of them
were in TIME_WAIT: socket() failed with ENOMEM until TIME_WAIT
expired.
## Impact
bug fix
## Testing
detected by automate tests from https://github.com/railab/nuttx-testlab
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