btrfs: output extra debug info if we failed to find an inline backref

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: btrfs: output extra debug info if we failed to find an inline backref [BUG] Syzbot reported several warning triggered inside lookup_inline_extent_backref(). [CAUSE] As usual, the reproducer doesn't reliably trigger locally here, but at least we know the WARN_ON() is triggered when an inline backref can not be found, and it can only be triggered when @insert is true. (I.e. inserting a new inline backref, which means the backref should already exist) [ENHANCEMENT] After the WARN_ON(), dump all the parameters and the extent tree leaf to help debug.

References

• https://git.kernel.org/stable/c/376b41524b71e494514720bd6114325b0a2ed19c
• https://git.kernel.org/stable/c/400e08a16604b534fdd82c5a288fa150d04f5f79
• https://git.kernel.org/stable/c/7afbfde45d665953b4d5a42a721e15bf0315d89b
• https://git.kernel.org/stable/c/b7c3cf2f6c42e6688b1c37215a0b1663f982f915
• https://git.kernel.org/stable/c/6994f806c6d1ae8b59344d3700358547f3b3fe1d
• https://git.kernel.org/stable/c/28062cd6eda04035d8f6ded2001292ac8b496149
• https://git.kernel.org/stable/c/e70ba449b04b40584bdabb383d10455397cbf177
• https://git.kernel.org/stable/c/7f72f50547b7af4ddf985b07fc56600a4deba281