Regression in 4.14.147, 4.19.76, 5.2.18 leading to kernel panic on btrfs root fs mount

From: Andrew Macks
Date: Sun Oct 13 2019 - 12:04:32 EST

Was not sure the correct way to escalate this quickly enough. I
unfortunately discovered this issue while upgrading a server (remotely) to
4.19.78 (longterm).

*Bug 205181* <> - kernel
panic when accessing btrfs root device with f2fs in kernel