Bcachefs project lead Kent Overstreet has written about his problems with the Linux kernel folks and the code of conduct put in place to prevent such flamewars.
The bcachefs team is partly funding the development of their next-gen file system using Patreon, where the project lead Kent Overstreet posted a lengthy article about trouble in the kernel. The current dispute has resulted in Linus Torvalds refusing the latest fixes to this radical new file system, and there's a real risk that the Paramount Penguin may fulfill his threat last month to remove the bcachefs from the kernel. This would be a big loss; it took years of work before it was finally included earlier this year.
At least one of the causes of the current situation is that Overstreet posted an intemperate response in an earlier thread, which ended in swearing.
Now, to be fair, this is very far from the first time that's happened on the Linux kernel mailing list. Indeed, The Register has been reporting on such incidents at least since 2013. Even since Linus took a break back in 2018 to "get help on how to behave differently," it still occasionally happens.