Have you checked the PAM for the supported kernel for an EHP6 system?
According to PAM you need to use an EXT version of the kernel.
You cannot use kernel release 7.40 or 7.41.
Read these SAP notes
1969546 - Release Roadmap Kernel 740
1994690 - Using the 7.41 kernel instead of 7.40
Cheers
RB