More different nouveau kernel log:

Oct 12 12:08:00 phoenix kernel: nouveau E[     PFB][0000:01:00.0] trapped write at 0x00200120d4 on channel 0x0007ebd4 [unknown] P
Oct 12 12:08:00 phoenix kernel: nouveau E[   PFIFO][0000:01:00.0] CACHE_ERROR - ch 13 [chrome[2646]] subc 0 mthd 0x0060 data 0xbe
Oct 12 12:08:00 phoenix kernel: nouveau E[   PFIFO][0000:01:00.0] DMA_PUSHER - ch 13 [chrome[2646]] get 0x002034f200 put 0x002034
Oct 12 12:08:00 phoenix kernel: nouveau E[     PFB][0000:01:00.0] trapped read at 0x002034f200 on channel 0x0007ebd4 [unknown] PF
Oct 12 12:08:00 phoenix kernel: nouveau E[   PFIFO][0000:01:00.0] DMA_PUSHER - ch 13 [chrome[2646]] get 0x00201037a0 put 0x002010
Oct 12 12:08:00 phoenix kernel: nouveau E[   PFIFO][0000:01:00.0] DMA_PUSHER - ch 13 [chrome[2646]] get 0x002034f200 put 0x002034
Oct 12 12:08:00 phoenix kernel: nouveau E[     PFB][0000:01:00.0] trapped read at 0x002034f200 on channel 0x0007ebd4 [unknown] PF
Oct 12 12:08:00 phoenix kernel: nouveau E[   PFIFO][0000:01:00.0] DMA_PUSHER - ch 13 [chrome[2646]] get 0x00201035cc put 0x002010
Oct 12 12:08:00 phoenix kernel: nouveau E[   PFIFO][0000:01:00.0] DMA_PUSHER - ch 13 [chrome[2646]] get 0x002034f200 put 0x002034
Oct 12 12:08:00 phoenix kernel: nouveau E[     PFB][0000:01:00.0] trapped read at 0x002034f200 on channel 0x0007ebd4 [unknown] PF
Oct 12 12:08:00 phoenix kernel: nouveau E[   PFIFO][0000:01:00.0] DMA_PUSHER - ch 13 [chrome[2646]] get 0x00201034b8 put 0x002010
Oct 12 12:08:00 phoenix kernel: nouveau E[   PFIFO][0000:01:00.0] DMA_PUSHER - ch 13 [chrome[2646]] get 0x002034f200 put 0x002034
Oct 12 12:08:00 phoenix kernel: nouveau E[     PFB][0000:01:00.0] trapped read at 0x002034f200 on channel 0x0007ebd4 [unknown] PF