[Nouveau] [Bug 111642] NV43 GeForce 6600 Nouveau is not stable on legacy hardware

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111642

--- Comment #14 from Vasili Pupkin <diggest at gmail.com> ---
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
minutes.

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+0x1fd/0x400
  worker_thread+0x34/0x410
  kthread+0x121/0x140
  ? process_one_work+0x400/0x400
  ? kthread_park+0x90/0x90
  ret_from_fork+0x35/0x40

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