It seemed inevitable that the Linux kernel sources would expand beyond 40 million lines early this year. With the recent release of Linux 6.14 rc1 sources the figure has ballooned to 40,063,856 lines.

https://www.tomshardware.com/software/linux/linux-kernel-source-expands-beyond-40-million-lines-it-has-doubled-in-size-in-a-decade