[Bug 267028] kernel panics when booting with both (zfs,ko or vboxnetflt,ko or acpi_wmi.ko) and amdgpu.ko

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=267028

--- Comment #173 from George Mitchell <george@m5p.com> ---
Here are a collection of points in response to Mark Millard's request.

1. Regardless of the order in which I load kernel modules by hand in
single-user mode, I can't ever duplicate the crash.

2. The crash never happens if amdgpu.ko is not loaded.

3. Emmanuel Vadot categorically states that the many, many references to
drm_modeset_is_locked failures in the crash summaries are noise and don't
indicate drm failures and are caused by virtual terminal switching.  But I
still get crashes even when there are no virtual terminal switches (because I
didn't start X windows and I didn't type ALT-Fn).

4. The crash always happens after amdgpu.ko is loaded, and (in terms of time of
occurrence) at about the time vboxnetflt.ko or acpi_wmi.ko is loaded.  The
seeming zfs crash can happen even when zfs.ko is loaded before amdgpu.ko, and I
theorize that it happens when my large (1TB) USB ZFS-formatted drive comes on
line and gets tasted (after amdgpu.ko is loaded).

5. But I can't come up with any theory in which I can blame the actual crash on
vboxnetflt.ko, acpi_wmi.ko, or zfs.ko.  This bug should not be assigned to
freebsd-fs. But I can't tell you to whom it should be assigned.

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