https://bugzilla.kernel.org/show_bug.cgi?id=210123

Bug ID: 210123 Summary: drm:drm_atomic_helper_wait_for_dependencies [drm_kms_helper]] - flip_done time out with vmwgfx Product: Drivers Version: 2.5 Kernel Version: 5.3.18-24.9.1 Hardware: x86-64 OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: Video(DRI - non Intel) Assignee: drivers_video-dri@kernel-bugs.osdl.org Reporter: stefan+kernel@mayr-stefan.de Regression: No

Since we upgraded SUSE Linux Enterprise Server 15 from kernel 4.12.14-197.45.1 (SLES15 SP1) to 5.3.18-24.9.1 (SLES15 SP2) or later we see the following error messages on some virtual machines:

[102215.857602] [drm:drm_atomic_helper_wait_for_dependencies [drm_kms_helper]] *ERROR* [CRTC:38:crtc-0] flip_done timed out [102226.097847] [drm:drm_atomic_helper_wait_for_dependencies [drm_kms_helper]] *ERROR* [PLANE:34:plane-0] flip_done timed out

We were also provided some more current kernels from SUSE support: - 5.3.18 with updated modules - 5.8.15 - 5.9.1

The issue stays the same. All affected machines are running in runlevel 3. The only graphical "thing" is the boot screen and when this error appears in the logs this screen is sitting at an empty login prompt. All virtual machines are running in a VMware environment on ESXi-Hosts with versions between 6.0.x and 6.7.x. We could not track it down to specific ESXi versions, load on the ESXi host or even the virtual machine. This happens on different versions, loaded and also on idle hosts and virtual machines.

The issue goes away when we add vmwgfx to the grub module_blacklist.

I know our kernel versions are somehow SUSE specific. But what changed between 4.12 and 5.3 and later that may cause this message between drm and vmwgfx?