[Nouveau] [Bug 26521] Bug in kernel module - ttm_bo_pci_offset

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Sun Jun 13 14:11:17 PDT 2010


https://bugs.freedesktop.org/show_bug.cgi?id=26521

--- Comment #12 from Marcin Slusarz <marcin.slusarz at gmail.com> 2010-06-13 14:11:16 PDT ---
For some reason I can reliably reproduce this bug, so I've added some
BUG_ON's/WARN_ON's and it revealed that:

- it crashes because of mem->mm_node being NULL (at least when mem->mem_type ==
TTM_PL_VRAM)
- it comes through 2nd ttm_mem_reg_ioremap in ttm_bo_move_memcpy, so it is
new_mem which mm_node == NULL
- it comes through 2nd ttm_bo_move_memcpy in nouveau_bo_move, so some earlier
nouveau_bo_move_* failed, which can only happen in case of some hardware
failure (lockup or somthing)

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