[214505.181066] amdgpu 0000:03:00.0: swiotlb buffer is full (sz: 2097152 bytes)
[214505.181068] swiotlb: coherent allocation failed for device 0000:03:00.0 size=2097152
[214505.181070] CPU: 0 PID: 4928 Comm: Xorg Not tainted 4.15.0-rc5-mainline #1
[214505.181070] Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./Z87 Extreme6, BIOS P2.40 07/08/2014
[214505.181071] Call Trace:
[214505.181078]  dump_stack+0x5c/0x85
[214505.181081]  swiotlb_alloc_coherent+0xe0/0x150
[214505.181085]  ttm_dma_pool_get_pages+0x1f0/0x5b0 [ttm]
[214505.181088]  ttm_dma_populate+0x24d/0x340 [ttm]
[214505.181090]  ttm_tt_bind+0x23/0x50 [ttm]
[214505.181092]  ttm_bo_handle_move_mem+0x5cd/0x600 [ttm]
[214505.181095]  ttm_bo_validate+0x12f/0x140 [ttm]
[214505.181103]  ? drm_mode_set_crtcinfo.part.4+0x41/0x1d0 [drm]
[214505.181105]  ttm_bo_init_reserved+0x38f/0x420 [ttm]
[214505.181131]  amdgpu_bo_do_create+0x1b0/0x420 [amdgpu]
[214505.181151]  ? amdgpu_fill_buffer+0x300/0x300 [amdgpu]
[214505.181153]  ? unix_write_space+0xe/0xa0
[214505.181170]  amdgpu_bo_create+0x50/0x270 [amdgpu]
[214505.181173]  ? kmem_cache_free+0x1d1/0x1f0
[214505.181190]  amdgpu_gem_object_create+0x7f/0x110 [amdgpu]
[214505.181207]  ? amdgpu_gem_object_close+0x1e0/0x1e0 [amdgpu]
[214505.181224]  amdgpu_gem_create_ioctl+0x1d9/0x270 [amdgpu]
[214505.181241]  ? amdgpu_gem_object_close+0x1e0/0x1e0 [amdgpu]
[214505.181247]  drm_ioctl_kernel+0x59/0xb0 [drm]
[214505.181252]  drm_ioctl+0x2d5/0x370 [drm]
[214505.181268]  ? amdgpu_gem_object_close+0x1e0/0x1e0 [amdgpu]
[214505.181270]  ? ep_scan_ready_list.constprop.16+0x208/0x210
[214505.181272]  ? timerqueue_add+0x52/0x80
[214505.181287]  amdgpu_drm_ioctl+0x49/0x80 [amdgpu]
[214505.181290]  do_vfs_ioctl+0xa1/0x610
[214505.181292]  ? __sys_recvmsg+0x4e/0x90
[214505.181293]  ? __sys_recvmsg+0x7d/0x90
[214505.181294]  SyS_ioctl+0x74/0x80
[214505.181297]  entry_SYSCALL_64_fastpath+0x1a/0x7d
[214505.181298] RIP: 0033:0x7f89c5013337
[214505.181299] RSP: 002b:00007ffdd9383d98 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[214505.181300] RAX: ffffffffffffffda RBX: 0000555cde890960 RCX: 00007f89c5013337
[214505.181301] RDX: 00007ffdd9383de0 RSI: 00000000c0206440 RDI: 000000000000000d
[214505.181301] RBP: 0000555cde88e400 R08: 0000555cdf47e270 R09: 0000555cde6e9010
[214505.181302] R10: 00007f89c52d8aa0 R11: 0000000000000246 R12: 00007ffdd93848b0
[214505.181302] R13: 00007ffdd9384890 R14: 0000555cdfd1c198 R15: 0000000000000015
[214505.506896] hl2_linux[25853]: segfault at 0 ip 00000000ec0e5a6e sp 00000000ff868b90 error 6 in engine.so[ebbd8000+882000]