Socket used for communication with the node. May not own a Sock object (after CloseSocketDisconnect() or during tests). shared_ptr (instead of unique_ptr) is used to avoid premature close of the underlying file descriptor by one thread while another thread is poll(2)-ing it for activity.
Declared in <net.h>
[[guarded_by(0x7ff36f2e01f8), guarded_by(0x7ff36e4bca28), guarded_by(0x7ff37ef681e8), guarded_by(0x7ff3770c4ea8), guarded_by(0x7ff38f6281b8), guarded_by(0x7ff37eb78b58), guarded_by(0x7ff37bc1b208), guarded_by(0x7ff38919b818), guarded_by(0x7ff37a03c058), guarded_by(0x7ff383afd448), guarded_by(0x7ff37ca25a28)]]
std::shared_ptr<Sock> m_sock;https://github.com/bitcoin/bitcoin/issues/21744 for details.