8.0 beta2 (patched) - drm_bufs.c: system freeze

[albri]

hello list,
here is an information what does not function on one system:
a patched drm with rnoland's patch drm-nouveau-043009.patch and a daily fresh xf86-video-nouveau causes system to freeze. there was written no coredump and no Xorg.o.log, just a freeze. the only info gotten is written to log/messages.
kernel is GENERIC with amd64. graphic card is IGP.
just for your information in wish it is helpful.

best regards

kern.ostype: FreeBSD
kern.osrelease: 8.0-BETA2
kern.osrevision: 199506
kern.osreldate: 800106

# cat messages | grep -ie "nouve\|drm"
Jul 30 02:27:07 xxx kernel: drm0: <NVidia Display Adapter> on vgapci0
Jul 30 02:27:07 xxx kernel: info: [drm] MSI enabled 1 message(s)
Jul 30 02:27:07 xxx kernel: info: [drm] Detected an NV44 generation card (0x04e000a2)
Jul 30 02:27:07 xxx kernel: vgapci0: child drm0 requested pci_enable_busmaster
Jul 30 02:27:07 xxx kernel: info: [drm] Initialized nouveau 0.0.12 20060213
Jul 30 02:27:48 xxx kernel: error: [drm:pid1979:drm_alloc_resource] *ERROR* Couldn't find resource 0x2
Jul 30 02:29:19 xxx kernel: exclusive sleep mutex drmdev (drmdev) r = 0 (0xffffff00112a20a0) locked @ /usr/src/sys/modules/drm/drm/../../../dev/drm/drm_bufs.c:55
Jul 30 02:29:19 xxx kernel: drm_sg_alloc() at drm_sg_alloc+0x4b
Jul 30 02:29:19 xxx kernel: nouveau_mem_init() at nouveau_mem_init+0x4f3
Jul 30 02:29:19 xxx kernel: nouveau_card_init() at nouveau_card_init+0x7c5
Jul 30 02:29:19 xxx kernel: nouveau_ioctl_card_init() at nouveau_ioctl_card_init+0x9
Jul 30 02:29:19 xxx kernel: drm_ioctl() at drm_ioctl+0x314
Jul 30 02:29:19 xxx kernel: panic: _mtx_lock_sleep: recursed on non-recursive mutex drmdev @ /usr/src/sys/modules/drm/drm/../../../dev/drm/drm_scatter.c:123
Jul 30 22:14:54 xxx kernel: drm0: <NVidia Display Adapter> on vgapci0
Jul 30 22:14:54 xxx kernel: info: [drm] MSI enabled 1 message(s)
Jul 30 22:14:54 xxx kernel: info: [drm] Detected an NV44 generation card (0x04e000a2)
Jul 30 22:14:54 xxx kernel: vgapci0: child drm0 requested pci_enable_busmaster
Jul 30 22:14:54 xxx kernel: info: [drm] Initialized nouveau 0.0.12 20060213
Jul 31 09:16:27 xxx kernel: drm0: <NVidia Display Adapter> on vgapci0
Jul 31 09:16:27 xxx kernel: info: [drm] MSI enabled 1 message(s)
Jul 31 09:16:27 xxx kernel: info: [drm] Detected an NV44 generation card (0x04e000a2)
Jul 31 09:16:27 xxx kernel: vgapci0: child drm0 requested pci_enable_busmaster
Jul 31 09:16:27 xxx kernel: info: [drm] Initialized nouveau 0.0.12 20060213
Jul 31 09:19:34 xxx kernel: error: [drm:pid17956:drm_alloc_resource] *ERROR* Couldn't find resource 0x2
Jul 31 09:19:34 xxx kernel: exclusive sleep mutex drmdev (drmdev) r = 0 (0xffffff00269ae0a0) locked @ /usr/src/sys/modules/drm/drm/../../../dev/drm/drm_bufs.c:55
Jul 31 09:19:34 xxx kernel: drm_sg_alloc() at drm_sg_alloc+0x4b
Jul 31 09:19:34 xxx kernel: nouveau_mem_init() at nouveau_mem_init+0x4f3
Jul 31 09:19:34 xxx kernel: nouveau_card_init() at nouveau_card_init+0x7c5
Jul 31 09:19:34 xxx kernel: nouveau_ioctl_card_init() at nouveau_ioctl_card_init+0x9
Jul 31 09:19:34 xxx kernel: drm_ioctl() at drm_ioctl+0x314
Jul 31 09:19:34 xxx kernel: panic: _mtx_lock_sleep: recursed on non-recursive mutex drmdev @ /usr/src/sys/modules/drm/drm/../../../dev/drm/drm_scatter.c:123
Jul 31 09:23:29 xxx kernel: drm0: <NVidia Display Adapter> on vgapci0
Jul 31 09:23:29 xxx kernel: info: [drm] MSI enabled 1 message(s)
Jul 31 09:23:29 xxx kernel: info: [drm] Detected an NV44 generation card (0x04e000a2)
Jul 31 09:23:29 xxx kernel: vgapci0: child drm0 requested pci_enable_busmaster
Jul 31 09:23:29 xxx kernel: info: [drm] Initialized nouveau 0.0.12 20060213