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amd iommu is deployed on that machine, and its support for kdump has not beed provided. 

Hi Emma, when you add amd_iommu=off into cmdline of 1st kernel, does it work well?

Thanks
Baoquan

And, with nr_cpus=1, it works?

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:0807