[  415.927624] INFO: rcu_preempt detected stalls on CPUs/tasks: { 1} (detected by 6, t=60004 jiffies, g=12008, c=12007, q=0)
[  415.927646] Task dump for CPU 1:
[  415.927649] steam           R  running task        0  1781   1701 0x20020008
[  415.927654]  ffff880252249b80 ffffffff81579096 0000000000012100 0000000000012100
[  415.927658]  ffff880071c3bfd8 ffff88025464c990 0000000000000000 ffff880071c3bf48
[  415.927662]  ffffffff815229f9 ffff88024ea55800 ffffffff8147f853 ffff8802536c3c00
[  415.927665] Call Trace:
[  415.927674]  [<ffffffff81579096>] ? __schedule+0x296/0x670
[  415.927681]  [<ffffffff815229f9>] ? unix_write_space+0x9/0x80
[  415.927686]  [<ffffffff8147f853>] ? sock_wfree+0x53/0x60
[  415.927690]  [<ffffffff81524838>] ? unix_stream_recvmsg+0x388/0x7e0
[  415.927696]  [<ffffffff810eab37>] ? release_pages+0x87/0x220
[  415.927700]  [<ffffffff810eab37>] ? release_pages+0x87/0x220
[  415.927704]  [<ffffffff810eadb6>] ? pagevec_lru_move_fn+0xe6/0x100
[  415.927708]  [<ffffffff8111655d>] ? free_pages_and_swap_cache+0x8d/0xb0
[  415.927712]  [<ffffffff81101494>] ? tlb_flush_mmu_free+0x24/0x40
[  415.927763]  [<ffffffffc0427d75>] ? nv04_timer_read+0x45/0x60 [nouveau]
[  415.927793]  [<ffffffffc0427b1a>] ? nouveau_timer_wait_eq+0x6a/0xd0 [nouveau]
[  415.927814]  [<ffffffffc03ebbc8>] ? nv84_bar_flush+0x48/0x70 [nouveau]
[  415.927842]  [<ffffffffc042ad5a>] ? nvc0_vm_flush+0x3a/0x180 [nouveau]
[  415.927880]  [<ffffffffc0471d81>] ? nouveau_gem_object_close+0x171/0x1a0 [nouveau]
[  415.927897]  [<ffffffffc02148b6>] ? drm_gem_handle_delete+0x96/0xf0 [drm]
[  415.927912]  [<ffffffffc02157ff>] ? drm_ioctl+0x1bf/0x5a0 [drm]
[  415.927916]  [<ffffffff811094ac>] ? unmap_region+0xac/0xf0
[  415.927938]  [<ffffffffc022c37d>] ? drm_compat_ioctl+0x2d/0x40 [drm]
[  415.927942]  [<ffffffff8118dac4>] ? compat_SyS_ioctl+0xb4/0x2f0
[  415.927946]  [<ffffffff8110b760>] ? vm_munmap+0x40/0x50
[  415.927951]  [<ffffffff8157f24c>] ? sysenter_dispatch+0x7/0x21