[Bug 249147] [ZFS][Panic]Fatal trap 18 on boot after OpenZFS import

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=249147

            Bug ID: 249147
           Summary: [ZFS][Panic]Fatal trap 18 on boot after OpenZFS import
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: junchoon at dec.sakura.ne.jp
 Attachment #217787 text/plain
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Created attachment 217787
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=217787&action=edit
Trap screen sample

Panic by fatal trap 18 on boot from ZFS root configuration.
Last bootable revision is r364744.

Panics on first reboot after installkernel (before installworld),
so loader.efi on the root pool is of r364744.

Panic screen is attached (typed up from photo, so possibly contain typo).

 *amd64 on ThinkPad P52, Core i7-8750H with descrete nvidia GPU.

 *2 independent root pools, one stable/12 on nvd0 and one head on ada0.

 *boot1.efi (as bootx64.efi) chain-boots loader.efi fine.

 *(Old)loader.efi seems to boot kernel fine, as bold and bright kernel output
  looks fine, and panics just the timing single user shell path input is
required
  on usual single user boot.

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