> Same problem here when trying to use vdpau on a G92 card

Same thing on NV96:
Mar 20 23:36:15 fixe kernel: nouveau E[  PGRAPH][0000:02:00.0] TRAP_PROP - TP 0
- RT_FAULT - Address 00204150c0
Mar 20 23:36:15 fixe kernel: nouveau E[  PGRAPH][0000:02:00.0] TRAP_PROP - TP 0
- e0c: 00000000, e18: 00000000, e1c: 00340030, e20: 00001100, e24: 00030000
Mar 20 23:36:15 fixe kernel: nouveau E[  PGRAPH][0000:02:00.0] TRAP_PROP - TP 1
- RT_FAULT - Address 0020415080
Mar 20 23:36:15 fixe kernel: nouveau E[  PGRAPH][0000:02:00.0] TRAP_PROP - TP 1
- e0c: 00000000, e18: 00000000, e1c: 00340020, e20: 00001100, e24: 00030000
Mar 20 23:36:15 fixe kernel: nouveau E[  PGRAPH][0000:02:00.0] ch 5
[0x001f7a8000 mplayer[31053]] subc 3 class 0x8297 mthd 0x1b0c data 0x1000f010
Mar 20 23:36:15 fixe kernel: nouveau E[     PFB][0000:02:00.0] trapped write at
0x0020415080 on channel 0x0001f7a8 [mplayer[31053]] PGRAPH/PROP/RT0 reason:
PAGE_NOT_PRESENT
Mar 20 23:36:15 fixe kernel: nouveau E[     PFB][0000:02:00.0] trapped write at
0x00204b7c40 on channel 0x0001f7a8 [mplayer[31053]] PGRAPH/PROP/RT0 reason:
PAGE_NOT_PRESENT
Mar 20 23:36:15 fixe kernel: nouveau E[  PGRAPH][0000:02:00.0] TRAP_PROP - TP 0
- RT_FAULT - Address 00204990c0
Mar 20 23:36:15 fixe kernel: nouveau E[  PGRAPH][0000:02:00.0] TRAP_PROP - TP 0
- e0c: 00000000, e18: 00000000, e1c: 08740030, e20: 00001100, e24: 00030000
Mar 20 23:36:15 fixe kernel: nouveau E[  PGRAPH][0000:02:00.0] TRAP_PROP - TP 1
- RT_FAULT - Address 0020499080
Mar 20 23:36:15 fixe kernel: nouveau E[  PGRAPH][0000:02:00.0] TRAP_PROP - TP 1
- e0c: 00000000, e18: 00000000, e1c: 08740020, e20: 00001100, e24: 00030000
Mar 20 23:36:15 fixe kernel: nouveau E[  PGRAPH][0000:02:00.0] ch 5
[0x001f7a8000 mplayer[31053]] subc 3 class 0x8297 mthd 0x1b0c data 0x1000f010
Mar 20 23:36:15 fixe kernel: nouveau E[     PFB][0000:02:00.0] trapped write at
0x0020499080 on channel 0x0001f7a8 [mplayer[31053]] PGRAPH/PROP/RT0 reason:
PAGE_NOT_PRESENT
Mar 20 23:36:15 fixe kernel: nouveau E[     PFB][0000:02:00.0] trapped write at
0x0020533c40 on channel 0x0001f7a8 [mplayer[31053]] PGRAPH/PROP/RT0 reason:
PAGE_NOT_PRESENT
Mar 20 23:36:15 fixe kernel: nouveau E[  PGRAPH][0000:02:00.0] TRAP_PROP - TP 0
- RT_FAULT - Address 0040840080
Mar 20 23:36:15 fixe kernel: nouveau E[  PGRAPH][0000:02:00.0] TRAP_PROP - TP 0
- e0c: 00000000, e18: 00000000, e1c: 05ac0020, e20: 00001100, e24: 00030000
Mar 20 23:36:15 fixe kernel: nouveau E[  PGRAPH][0000:02:00.0] TRAP_PROP - TP 1
- RT_FAULT - Address 00408400c0
Mar 20 23:36:15 fixe kernel: nouveau E[  PGRAPH][0000:02:00.0] TRAP_PROP - TP 1
- e0c: 00000000, e18: 00000000, e1c: 05ac0030, e20: 00001100, e24: 00030000
Mar 20 23:36:15 fixe kernel: nouveau E[  PGRAPH][0000:02:00.0] ch 5
[0x001f7a8000 mplayer[31053]] subc 3 class 0x8297 mthd 0x1b0c data 0x1000f010
Mar 20 23:36:15 fixe kernel: nouveau E[     PFB][0000:02:00.0] trapped write at
0x00408400c0 on channel 0x0001f7a8 [mplayer[31053]] PGRAPH/PROP/RT0 reason:
PAGE_NOT_PRESENT
Mar 20 23:36:15 fixe kernel: nouveau E[     PFB][0000:02:00.0] trapped write at
0x00408df000 on channel 0x0001f7a8 [mplayer[31053]] PGRAPH/PROP/RT0 reason:
PAGE_NOT_PRESENT

I have also notice that It happens when the load average of my system is quite
hight (compilation, backup).
=> Hang happenned during the playback.

Or when I openned two files too quickly.
=> Hang happenned immedialety.

mplayer 1.2 (20130729)
kernel 3.18.7
mesa 10.3.7
nvidia-firmware 340.32
xf86-video-nouveau 1.0.11
libva-vdpau-driver 0.7.4-r2
libvdpau 0.9
X 1.16.4