Comment 19 for bug 1672033

[ 163.975845] Call Trace:
[ 163.975854] dump_stack+0x63/0x81
[ 163.975858] __warn+0xcb/0xf0
[ 163.975860] warn_slowpath_null+0x1d/0x20
[ 163.975866] drm_atomic_helper_commit_hw_done+0xab/0xb0 [drm_kms_helper]
[ 163.975869] nvidia_drm_atomic_helper_commit_tail+0x128/0x1d0 [nvidia_drm]
[ 163.975875] commit_tail+0x3f/0x80 [drm_kms_helper]
[ 163.975879] commit_work+0x12/0x20 [drm_kms_helper]
[ 163.975881] process_one_work+0x1fc/0x4b0
[ 163.975883] worker_thread+0x4b/0x500
[ 163.975886] kthread+0x101/0x140
[ 163.975888] ? process_one_work+0x4b0/0x4b0
[ 163.975890] ? kthread_create_on_node+0x60/0x60
[ 163.975893] ret_from_fork+0x2c/0x40
[ 163.975895] ---[ end trace 341cfa538776d33d ]---