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Date:      Sun, 29 Dec 2024 23:43:09 +0000
From:      bugzilla-noreply@freebsd.org
To:        fs@FreeBSD.org
Subject:   [Bug 267028] kernel panics when booting with both (zfs,ko or vboxnetflt,ko or acpi_wmi.ko) and amdgpu.ko
Message-ID:  <bug-267028-3630-UjRJLaNDhx@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-267028-3630@https.bugs.freebsd.org/bugzilla/>
References:  <bug-267028-3630@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D267028

--- Comment #338 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
(In reply to George Mitchell from comment #337)

It again has the "WARNING !drm_modeset_is_locked . . ." lines
before there is any trap or panic notice:

. . .
[drm] Initialized amdgpu 3.40.0 20150101 for drmn0 on minor 0
WARNING !drm_modeset_is_locked(&crtc->mutex) failed at
/usr/ports/graphics/drm-510-kmod/work/drm-kmod-drm_v5.10.163_7/drivers/gpu/=
drm/drm_atomic_helper.c:619
WARNING !drm_modeset_is_locked(&crtc->mutex) failed at
/usr/ports/graphics/drm-510-kmod/work/drm-kmod-drm_v5.10.163_7/drivers/gpu/=
drm/drm_atomic_helper.c:619
WARNING !drm_modeset_is_locked(&crtc->mutex) failed at
/usr/ports/graphics/drm-510-kmod/work/drm-kmod-drm_v5.10.163_7/drivers/gpu/=
drm/drm_atomic_helper.c:619
WARNING !drm_modeset_is_locked(&crtc->mutex) failed at
/usr/ports/graphics/drm-510-kmod/work/drm-kmod-drm_v5.10.163_7/drivers/gpu/=
drm/drm_atomic_helper.c:619
WARNING !drm_modeset_is_locked(&dev->mode_config.connection_mutex) failed at
/usr/ports/graphics/drm-510-kmod/work/drm-kmod-drm_v5.10.163_7/drivers/gpu/=
drm/drm_atomic_helper.c:669
WARNING !drm_modeset_is_locked(&plane->mutex) failed at
/usr/ports/graphics/drm-510-kmod/work/drm-kmod-drm_v5.10.163_7/drivers/gpu/=
drm/drm_atomic_helper.c:894
WARNING !drm_modeset_is_locked(&plane->mutex) failed at
/usr/ports/graphics/drm-510-kmod/work/drm-kmod-drm_v5.10.163_7/drivers/gpu/=
drm/drm_atomic_helper.c:894
WARNING !drm_modeset_is_locked(&plane->mutex) failed at
/usr/ports/graphics/drm-510-kmod/work/drm-kmod-drm_v5.10.163_7/drivers/gpu/=
drm/drm_atomic_helper.c:894
WARNING !drm_modeset_is_locked(&plane->mutex) failed at
/usr/ports/graphics/drm-510-kmod/work/drm-kmod-drm_v5.10.163_7/drivers/gpu/=
drm/drm_atomic_helper.c:894
WARNING !drm_modeset_is_locked(&plane->mutex) failed at
/usr/ports/graphics/drm-510-kmod/work/drm-kmod-drm_v5.10.163_7/drivers/gpu/=
drm/drm_atomic_helper.c:894
WARNING !drm_modeset_is_locked(&plane->mutex) failed at
/usr/ports/graphics/drm-510-kmod/work/drm-kmod-drm_v5.10.163_7/drivers/gpu/=
drm/drm_atomic_helper.c:894
WARNING !drm_modeset_is_locked(&plane->mutex) failed at
/usr/ports/graphics/drm-510-kmod/work/drm-kmod-drm_v5.10.163_7/drivers/gpu/=
drm/drm_atomic_helper.c:894
WARNING !drm_modeset_is_locked(&plane->mutex) failed at
/usr/ports/graphics/drm-510-kmod/work/drm-kmod-drm_v5.10.163_7/drivers/gpu/=
drm/drm_atomic_helper.c:894
WARNING !drm_modeset_is_locked(&plane->mutex) failed at
/usr/ports/graphics/drm-510-kmod/work/drm-kmod-drm_v5.10.163_7/drivers/gpu/=
drm/drm_atomic_helper.c:894
kernel trap 22 with interrupts disabled
                            kernel trap 22 with interrupts disabled
 panic: modlist_lookup: a prior tqe_next changed!
. . .

I do not see how to get useful information from the
attempted use of the hwatchpoint monitoring for the
unexpected tqe_next field value change. The above may
be evidence that a detection happened but that the
handling does not mix well with the drm/amdgpu operation
in some way.

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