Nouveau - Feb 2018 - [Bug 105173] [MCP79][Regression] Unhandled NULL pointer dereference in nvkm_object_unmap since kernel 4.15

https://bugs.freedesktop.org/show_bug.cgi?id=105173

--- Comment #8 from Nick Lee <nvlbox at gmail.com> ---
Also tried:

Vanilla kernel 4.15.4-300.vanilla.knurd.1.fc27.x86_64
mesa-17.3.5
wayland session
reproducible

Fedora-Workstation-Live-x86_64-Rawhide-20180220.n.0.iso
wayland session
mesa-18.0.0-0.1.rc4.fc28.x86_64
Got artefacts with dmesg output:

[ 1035.437016] nouveau 0000:03:00.0: swiotlb buffer is full (sz: 2097152 bytes)
[ 1035.437020] nouveau 0000:03:00.0: swiotlb: coherent allocation failed,
size=2097152
[ 1035.437023] CPU: 0 PID: 1842 Comm: gnome-shell Not tainted
4.16.0-0.rc2.git0.1.fc28.x86_64 #1
[ 1035.437024] Hardware name: NVIDIA MCP7A/MCP7A, BIOS 6.00 PG 04/22/2009
[ 1035.437025] Call Trace:
[ 1035.437036]  dump_stack+0x5c/0x85
[ 1035.437040]  swiotlb_alloc_coherent+0x1c3/0x1e0
[ 1035.437052]  ttm_dma_pool_get_pages+0x21a/0x620 [ttm]
[ 1035.437057]  ttm_dma_populate+0xdd/0x390 [ttm]
[ 1035.437062]  ttm_tt_bind+0x2e/0x60 [ttm]
[ 1035.437067]  ttm_bo_handle_move_mem+0x4cf/0x550 [ttm]
[ 1035.437073]  ttm_bo_validate+0x119/0x130 [ttm]
[ 1035.437104]  ? drm_get_edid_switcheroo+0x16/0x40 [drm]
[ 1035.437109]  ttm_bo_init_reserved+0x334/0x380 [ttm]
[ 1035.437114]  ? ttm_bo_init+0x62/0xd0 [ttm]
[ 1035.437190]  ? nouveau_bo_invalidate_caches+0x10/0x10 [nouveau]
[ 1035.437226]  ? nouveau_bo_new+0x401/0x580 [nouveau]
[ 1035.437262]  ? nouveau_bo_invalidate_caches+0x10/0x10 [nouveau]
[ 1035.437298]  ? nouveau_gem_new+0x120/0x120 [nouveau]
[ 1035.437334]  ? nouveau_gem_new+0x5d/0x120 [nouveau]
[ 1035.437370]  ? nouveau_gem_ioctl_new+0x53/0xe0 [nouveau]
[ 1035.437381]  ? drm_ioctl_kernel+0x5b/0xb0 [drm]
[ 1035.437392]  ? drm_ioctl+0x1c4/0x380 [drm]
[ 1035.437428]  ? nouveau_gem_new+0x120/0x120 [nouveau]
[ 1035.437431]  ? eventfd_write+0x94/0x2a0
[ 1035.437467]  ? nouveau_drm_ioctl+0x65/0xc0 [nouveau]
[ 1035.437470]  ? do_vfs_ioctl+0xa4/0x610
[ 1035.437471]  ? SyS_ioctl+0x74/0x80
[ 1035.437475]  ? do_syscall_64+0x74/0x180
[ 1035.437478]  ? entry_SYSCALL_64_after_hwframe+0x3d/0xa2

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