BUG: unable to handle kernel NULL pointer dereference at 0000000000000020

Computer freeze : no more mouse, no more keyboard
Computer seems alive also

May 12 19:19:19 Inspiron-3650 kernel: [43233.334564] BUG: unable to handle kernel NULL pointer dereference at 0000000000000020
May 12 19:19:19 Inspiron-3650 kernel: [43233.334576] IP: dma_fence_wait_timeout+0x36/0xf0
May 12 19:19:19 Inspiron-3650 kernel: [43233.334578] PGD 0
May 12 19:19:19 Inspiron-3650 kernel: [43233.334579]
May 12 19:19:19 Inspiron-3650 kernel: [43233.334582] Oops: 0000 [#1] SMP
May 12 19:19:19 Inspiron-3650 kernel: [43233.334585] Modules linked in: rfcomm ccm bnep binfmt_misc dm_crypt nls_iso8859_1 dell_wmi sparse_keymap dell_smbios dcdbas dell_smm_hwmon intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm irqbypass arc4 ath9k ath9k_common ath9k_hw ath mac80211 cfg80211 joydev usblp input_leds rtsx_usb_ms memstick ath3k btusb btrtl snd_hda_codec_hdmi crct10dif_pclmul crc32_pclmul ghash_clmulni_intel snd_hda_codec_realtek shpchp pcbc aesni_intel snd_hda_codec_generic aes_x86_64 crypto_simd glue_helper cryptd intel_cstate intel_rapl_perf serio_raw snd_hda_intel snd_hda_codec snd_hda_core snd_hwdep snd_pcm snd_seq_midi snd_seq_midi_event snd_rawmidi hci_uart btbcm btqca btintel snd_seq bluetooth intel_lpss_acpi intel_lpss snd_seq_device snd_timer snd mac_hid mei_me soundcore mei intel_pch_thermal
May 12 19:19:19 Inspiron-3650 kernel: [43233.334617] acpi_als kfifo_buf acpi_pad industrialio tpm_crb ip6t_REJECT nf_reject_ipv6 nf_log_ipv6 xt_hl ip6t_rt nf_conntrack_ipv6 nf_defrag_ipv6 ipt_REJECT nf_reject_ipv4 nf_log_ipv4 nf_log_common xt_LOG xt_limit xt_tcpudp xt_addrtype nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack ip6table_filter ip6_tables nf_conntrack_netbios_ns nf_conntrack_broadcast nf_nat_ftp nf_nat parport_pc libcrc32c ppdev nf_conntrack_ftp nf_conntrack iptable_filter lp parport ip_tables x_tables autofs4 uas hid_generic usbhid rtsx_usb_sdmmc rtsx_usb usb_storage nouveau mxm_wmi i2c_algo_bit ttm drm_kms_helper psmouse syscopyarea sysfillrect sysimgblt fb_sys_fops r8169 drm ahci mii libahci wmi video pinctrl_sunrisepoint i2c_hid pinctrl_intel hid fjes
May 12 19:19:19 Inspiron-3650 kernel: [43233.334648] CPU: 2 PID: 1348 Comm: Xorg Not tainted 4.10.0-20-generic #22-Ubuntu
May 12 19:19:19 Inspiron-3650 kernel: [43233.334653] Hardware name: Dell Inc. Inspiron 3650/0C2XKD, BIOS 3.3.6 09/30/2016
May 12 19:19:19 Inspiron-3650 kernel: [43233.334656] task: ffff95115a681700 task.stack: ffffabc381b70000
May 12 19:19:19 Inspiron-3650 kernel: [43233.334659] RIP: 0010:dma_fence_wait_timeout+0x36/0xf0
May 12 19:19:19 Inspiron-3650 kernel: [43233.334661] RSP: 0018:ffffabc381b73b60 EFLAGS: 00010206
May 12 19:19:19 Inspiron-3650 kernel: [43233.334664] RAX: 0000000000000000 RBX: ffff95114dda3b00 RCX: ffffffffa3c294e0
May 12 19:19:19 Inspiron-3650 kernel: [43233.334667] RDX: 7fffffffffffffff RSI: 0000000000000001 RDI: ffff95115b936e40
May 12 19:19:19 Inspiron-3650 kernel: [43233.334669] RBP: ffffabc381b73b80 R08: 0000000000000000 R09: ffff951153eff000
May 12 19:19:19 Inspiron-3650 kernel: [43233.334672] R10: ffff951157efcf00 R11: ffff9511542b6208 R12: ffff95115b936e40
May 12 19:19:19 Inspiron-3650 kernel: [43233.334674] R13: 0000000000000001 R14: 7fffffffffffffff R15: 0000000000000001
May 12 19:19:19 Inspiron-3650 kernel: [43233.334677] FS: 00007fa9fcc8da40(0000) GS:ffff951166500000(0000) knlGS:0000000000000000
May 12 19:19:19 Inspiron-3650 kernel: [43233.334680] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
May 12 19:19:19 Inspiron-3650 kernel: [43233.334682] CR2: 0000000000000020 CR3: 0000000255282000 CR4: 00000000003406e0
May 12 19:19:19 Inspiron-3650 kernel: [43233.334685] Call Trace:
May 12 19:19:19 Inspiron-3650 kernel: [43233.334702] drm_atomic_helper_wait_for_fences+0x48/0x120 [drm_kms_helper]
May 12 19:19:19 Inspiron-3650 kernel: [43233.334731] nv50_disp_atomic_commit+0x19c/0x2a0 [nouveau]
May 12 19:19:19 Inspiron-3650 kernel: [43233.334745] drm_atomic_commit+0x4b/0x50 [drm]
May 12 19:19:19 Inspiron-3650 kernel: [43233.334750] drm_atomic_helper_connector_dpms+0xf8/0x1c0 [drm_kms_helper]
May 12 19:19:19 Inspiron-3650 kernel: [43233.334770] nouveau_connector_dpms+0x1f/0x30 [nouveau]
May 12 19:19:19 Inspiron-3650 kernel: [43233.334778] drm_mode_connector_set_obj_prop+0x62/0x70 [drm]
May 12 19:19:19 Inspiron-3650 kernel: [43233.334785] drm_mode_obj_set_property_ioctl+0x11e/0x160 [drm]
May 12 19:19:19 Inspiron-3650 kernel: [43233.334792] drm_mode_connector_property_set_ioctl+0x3f/0x60 [drm]
May 12 19:19:19 Inspiron-3650 kernel: [43233.334799] drm_ioctl+0x21b/0x4c0 [drm]
May 12 19:19:19 Inspiron-3650 kernel: [43233.334805] ? drm_mode_connector_set_obj_prop+0x70/0x70 [drm]
May 12 19:19:19 Inspiron-3650 kernel: [43233.334825] nouveau_drm_ioctl+0x74/0xc0 [nouveau]
May 12 19:19:19 Inspiron-3650 kernel: [43233.334828] do_vfs_ioctl+0xa3/0x610
May 12 19:19:19 Inspiron-3650 kernel: [43233.334831] ? vfs_read+0x11b/0x130
May 12 19:19:19 Inspiron-3650 kernel: [43233.334833] SyS_ioctl+0x79/0x90
May 12 19:19:19 Inspiron-3650 kernel: [43233.334837] entry_SYSCALL_64_fastpath+0x1e/0xad
May 12 19:19:19 Inspiron-3650 kernel: [43233.334840] RIP: 0033:0x7fa9fa695987
May 12 19:19:19 Inspiron-3650 kernel: [43233.334842] RSP: 002b:00007fff596959f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
May 12 19:19:19 Inspiron-3650 kernel: [43233.334845] RAX: ffffffffffffffda RBX: 000055b568b6e590 RCX: 00007fa9fa695987
May 12 19:19:19 Inspiron-3650 kernel: [43233.334848] RDX: 00007fff59695a30 RSI: 00000000c01064ab RDI: 000000000000000e
May 12 19:19:19 Inspiron-3650 kernel: [43233.334851] RBP: 000055b568b6ea30 R08: 000055b568b74cd0 R09: 0000000000000000
May 12 19:19:19 Inspiron-3650 kernel: [43233.334853] R10: 000055b568b45c70 R11: 0000000000000246 R12: 0000000000000023
May 12 19:19:19 Inspiron-3650 kernel: [43233.334857] R13: 00007fff59695acc R14: 000055b566c9da88 R15: 00007fff59696714
May 12 19:19:19 Inspiron-3650 kernel: [43233.334859] Code: e5 41 56 41 55 41 54 53 0f 88 b0 00 00 00 49 89 fc 41 89 f5 49 89 d6 0f 1f 44 00 00 49 8b 44 24 08 41 0f b6 f5 4c 89 f2 4c 89 e7 <ff> 50 20 49 89 c5 0f 1f 44 00 00 5b 4c 89 e8 41 5c 41 5d 41 5e
May 12 19:19:19 Inspiron-3650 kernel: [43233.334879] RIP: dma_fence_wait_timeout+0x36/0xf0 RSP: ffffabc381b73b60
May 12 19:19:19 Inspiron-3650 kernel: [43233.334881] CR2: 0000000000000020
May 12 19:19:19 Inspiron-3650 kernel: [43233.339822] ---[ end trace ec010f8bfa795a35 ]---