BUG: unable to handle kernel paging request at ffffc9000327f018
IP: [<ffffffff81533a4d>] reservation_object_wait_timeout_rcu+0x31d/0x510
PGD 13a8a1067 PUD 13a8a2067 PMD 31d16067 PTE 0
Oops: 0000 [#1] PREEMPT SMP 
Modules linked in: drbg ctr ccm rfcomm bnep binfmt_misc arc4 iwldvm mac80211 iwlwifi uvcvideo cfg80211 snd_hda_codec_hdmi rtsx_usb snd_hda_codec_idt snd_hda_codec_generic btusb videobuf2_vmalloc snd_hda_intel btrtl snd_hda_codec btbcm videobuf2_memops btintel bluetooth videobuf2_v4l2 videobuf2_core v4l2_common snd_hwdep videodev snd_hda_core snd_pcm dell_wmi dell_laptop sparse_keymap dcdbas snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq x86_pkg_temp_thermal serio_raw coretemp snd_timer snd_seq_device snd soundcore lpc_ich parport_pc ppdev lp parport hid_generic nouveau ahci psmouse i915 libahci mxm_wmi ttm i2c_algo_bit drm_kms_helper usbhid syscopyarea hid sysfillrect sysimgblt fb_sys_fops drm wmi video
CPU: 1 PID: 976 Comm: Xorg Not tainted 4.4.0-rc3 #60
Hardware name: Dell Inc.          Inspiron 7720/04M3YM, BIOS A07 08/16/2012
task: ffff880032b2a540 ti: ffff8801346c4000 task.ti: ffff8801346c4000
RIP: 0010:[<ffffffff81533a4d>]  [<ffffffff81533a4d>] reservation_object_wait_timeout_rcu+0x31d/0x510
RSP: 0018:ffff8801346c7ce8  EFLAGS: 00010246
RAX: ffffc9000327f000 RBX: ffff88011e6b0300 RCX: 000000000327d000
RDX: 000000000327d000 RSI: 0000000000000000 RDI: ffffffff81c5efc0
RBP: ffff8801346c7d30 R08: 0000000000000000 R09: 0000000000000000
R10: ffff880032b2a540 R11: 0000000000000000 R12: ffff880032c99d58
R13: 0000000000000000 R14: 0000000000001d4c R15: ffff8800330009b8
FS:  00007f9271ca1980(0000) GS:ffff88013f240000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc9000327f018 CR3: 0000000135f80000 CR4: 00000000001406e0
Stack:
 ffffffff815337cd 00000001817432f1 ffff880033000a50 00000002016c7d30
 00000000fffffff0 0000000000000000 ffff880033000800 ffff880033000bf0
 ffffffffa03cd4f0 ffff8801346c7d68 ffffffffa035dced ffffffffa035dd23
Call Trace:
 [<ffffffff815337cd>] ? reservation_object_wait_timeout_rcu+0x9d/0x510
 [<ffffffffa035dced>] nouveau_gem_ioctl_cpu_prep+0x6d/0x160 [nouveau]
 [<ffffffffa035dd23>] ? nouveau_gem_ioctl_cpu_prep+0xa3/0x160 [nouveau]
 [<ffffffffa0072a2b>] drm_ioctl+0x14b/0x530 [drm]
 [<ffffffffa035dc80>] ? nouveau_gem_ioctl_pushbuf+0xce0/0xce0 [nouveau]
 [<ffffffff814e98a0>] ? rpm_resume+0xf0/0x7b0
 [<ffffffff814e9fad>] ? __pm_runtime_resume+0x4d/0x60
 [<ffffffff8110848d>] ? trace_hardirqs_on+0xd/0x10
 [<ffffffff81743392>] ? _raw_spin_unlock_irqrestore+0x42/0x70
 [<ffffffffa0354777>] nouveau_drm_ioctl+0x67/0xc0 [nouveau]
 [<ffffffff8124aa11>] do_vfs_ioctl+0x301/0x550
 [<ffffffff812566aa>] ? __fget_light+0x2a/0x90
 [<ffffffff8124acd9>] SyS_ioctl+0x79/0x90
 [<ffffffff81743c5b>] entry_SYSCALL_64_fastpath+0x16/0x73
Code: fe ff ff 48 c7 c2 18 f1 a2 81 be 92 03 00 00 48 c7 c7 f5 eb a2 81 c6 05 50 65 7f 00 01 e8 ec 30 bd ff e9 2a fe ff ff 48 8b 43 08 <48> 8b 40 18 48 85 c0 0f 84 03 fe ff ff 48 89 df ff d0 84 c0 0f 
RIP  [<ffffffff81533a4d>] reservation_object_wait_timeout_rcu+0x31d/0x510
 RSP <ffff8801346c7ce8>
CR2: ffffc9000327f018
---[ end trace 4f0c12fc10089ab5 ]---

For some reason it's easy to reproduce using Warsow 2.0 - I had hit it twice in the main menu.