| Summary: | [NVA5] BUG: unable to handle kernel NULL pointer dereference | ||||||
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| Product: | xorg | Reporter: | Patrice Mandin <patmandin> | ||||
| Component: | Driver/nouveau | Assignee: | Nouveau Project <nouveau> | ||||
| Status: | RESOLVED FIXED | QA Contact: | Xorg Project Team <xorg-team> | ||||
| Severity: | normal | ||||||
| Priority: | medium | ||||||
| Version: | unspecified | ||||||
| Hardware: | x86-64 (AMD64) | ||||||
| OS: | Linux (All) | ||||||
| Whiteboard: | |||||||
| i915 platform: | i915 features: | ||||||
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Booting kernel without 'nouveau.noaccel=1' makes it work. So it appears the noaccel case has been broken by said git commit. In nouveau_card_init() function (nouveau_state.c file), engine->fifo.init() function is not called when nouveau_noaccel is enabled. On NV50/NVA0 cards, engine->fifo.init = nv50_fifo_init (nv50_fifo.c file) and this function is responsible to fill pfifo->playlist array, which is not done with nouveau_noaccel enabled. When nv50_fifo_playlist_update() is called, accessing pfifo->playlist (which was not initialized) triggers the NULL pointer dereference. Fixed in git nouveau/linux-2.6 repository. Thanks darktama. |
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Created attachment 46222 [details] Kernel log Since commit e5ca5dec3111772ade1cbbead50c0c594a49778d (bisected, drm/nouveau: remove remnants of nouveau_pgraph_engine) to nouveau/linux-2.6, I get NULL pointer dereference when starting kernel.