These changes allowed me to produce crashfump with kernel-5.11
from Kernel:stable project:

- Update to version 1.6.8:
* Support newer kernels up to v5.9
* arm64: Add support for ARMv8.2-LPA (52-bit PA support)
* Retrieve MAX_PHYSMEM_BITS from vmcoreinfo
* sadump, kaslr: fix failure of calculating kaslr_offset
* Introduce --check-params option
* cope with not-present mem section
- Drop upstreamed patches:
* makedumpfile-Fix-cd_header-offset-overflow-with-large-pfn.patch
* makedumpfile-arm64-Align-PMD_SECTION_MASK-with-PHYS_MASK.patch
* makedumpfile-sadump-Fix-failure-of-reading.patch
- Allow to read kernel log from the lockless ringbuffer (bsc#1183965):
* makedumpfile-printk-add-support-for-lockless-ringbuffer.patch
* makedumpfile-printk-use-committed-finalized-state-value.patch