Hello all,
kdump on an SNP guest is broken in linux-next, starting with next-20250908 [1].
kdump on an SNP guest works with the following kernels as the guest kernel:
The crash log during kdump varies each time. I have attached all variants of the error console logs to this bug report as files, as they are too large to include here.
kdump with other guest types (normal, SEV, SEV-ES) is working fine.
I attempted bisecting multiple times, but due to varying error console messages—sometimes with a call trace, sometimes just a hang with no error messages, and sometimes with extensive register dumps including KVM hardware error messages—I had no success until now. Additionally, a couple of linux-next bisect attempt pointed to a merge commit where the parent commits had no issues, suggesting a possible merge problem.
I am also attaching the host kernel config and guest kernel config used for these tests.
Tests were conducted with the following component versions:
Thank you,
Srikanth Aithal <Srikanth.Aithal@amd.com>