--- Comment #14 from Vasili Pupkin <> ---
The system has two identical card installed (I completely forgotten about this
fact because no monitor is connected to the second adapter). I've connected
monitor to the second one and it only shows cursor, no window is shown when I
move one to the second monitor. Ok. I removed the second card and nouveau stop
spinning dmesg with those messages. The freezes remains and it feels less
stable with one card than it was with two cards, rarely survive more than five

So there are two questions: 
Are those messages a bug or the two adapter setup require some additional
configuration to work properly?
How to debug freezes? Ctrl+Alt+F2 doesn't work.

I've found this stacktrace in syslog at the end, not sure if it is the last
stack before crash

------------[ cut here ]------------
nouveau 0000:01:00.0: timeout
 Call Trace:
  nvkm_vmm_iter.constprop.12+0x2e5/0x880 [nouveau]
  ? nv41_vmm_pgt_sgl+0x140/0x140 [nouveau]
  ? nvkm_vmm_free_insert+0x80/0x80 [nouveau]
  ? nvkm_vmm_put_region+0xd0/0x160 [nouveau]
  nvkm_vmm_ptes_unmap_put+0x32/0x50 [nouveau]
  ? nv41_vmm_pgt_sgl+0x140/0x140 [nouveau]
  nvkm_vmm_put_locked+0x103/0x220 [nouveau]
  nvkm_uvmm_mthd+0x7eb/0x850 [nouveau]
  nvkm_object_mthd+0x1a/0x30 [nouveau]
  nvkm_ioctl_mthd+0x5d/0xb0 [nouveau]
  nvkm_ioctl+0x11d/0x280 [nouveau]
  nvkm_client_ioctl+0x12/0x20 [nouveau]
  nvif_object_ioctl+0x47/0x50 [nouveau]
  nvif_object_mthd+0x129/0x150 [nouveau]
  ? __ttm_dma_free_page.isra.5+0x32/0x40 [ttm]
  ? isolate_huge_page+0x30/0xa0
  ? __ttm_dma_free_page.isra.5+0x32/0x40 [ttm]
  ? ttm_dma_page_put+0x53/0x90 [ttm]
  nvif_vmm_put+0x5f/0x80 [nouveau]
  nouveau_mem_fini+0x3b/0x70 [nouveau]
  nv04_sgdma_unbind+0x12/0x20 [nouveau]
  ttm_tt_unbind+0x21/0x40 [ttm]
  ttm_tt_destroy.part.12+0x12/0x60 [ttm]
  ttm_tt_destroy+0x13/0x20 [ttm]
  ttm_bo_cleanup_memtype_use+0x32/0x70 [ttm]
  ttm_bo_cleanup_refs+0x1c0/0x200 [ttm]
  ? ttm_mem_global_free+0x13/0x20 [ttm]
  ttm_bo_delayed_delete+0x1cd/0x1e0 [ttm]
  ttm_bo_delayed_workqueue+0x1b/0x40 [ttm]
  ? process_one_work+0x400/0x400
  ? kthread_park+0x90/0x90

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