I recompiled the 4.18.0-20-general kernel and made the following
changes, and things start to work.

258c258,261
< 
---
>       if (limit < 1) {
>               pr_err("efi: Invalid name size %ld/%d.\n", name_size, limit);
>               return 0;
>       }


Logs proving the fix worked:
[    0.321692] Registered efivars operations
[    0.330723] efi: efi: Invalid name size 0/0.

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https://bugs.launchpad.net/bugs/1830951

Title:
  kernel panic: stack corrupted in efivar_ssdt_iter+0xd3/0xe8

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