Backtrace

WARNING: CPU: 2 PID: 14633 at drivers/gpu/drm/nouveau/nvkm/subdev/bar/g84.c:35 g84_bar_flush+0xaf/0xc0 [nouveau]
Modules linked in: uinput rfcomm ccm xt_CHECKSUM xt_MASQUERADE nf_nat_tftp nf_conntrack_tftp nf_conntrack_netbios_ns nf_conntrack_broadcast xt_CT tun ip6t_REJECT nf_reject_ipv6 bridge ip6t_rpfilter stp llc ipt_REJECT nf_reject_ipv4 xt_conntrack ebtable_nat ebtable_broute ip6table_nat ip6table_mangle ip6table_raw ip6table_security iptable_nat nf_nat iptable_mangle iptable_raw iptable_security nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ip_set nfnetlink ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter cmac bnep sunrpc vfat fat squashfs loop intel_rapl_msr snd_soc_skl snd_soc_sst_ipc iwlmvm snd_soc_sst_dsp snd_hda_ext_core snd_soc_acpi_intel_match snd_soc_acpi snd_soc_core mac80211 iTCO_wdt mei_hdcp intel_pmc_bxt iTCO_vendor_support intel_rapl_common x86_pkg_temp_thermal libarc4 intel_powerclamp rtsx_usb_ms coretemp memstick iwlwifi kvm_intel snd_hda_codec_hdmi snd_hda_codec_conexant snd_compress snd_hda_codec_generic uvcvideo ledtrig_audio btusb ac97_bus
 snd_pcm_dmaengine btrtl snd_hda_intel snd_intel_dspcfg btbcm videobuf2_vmalloc btintel snd_hda_codec videobuf2_memops kvm bluetooth cfg80211 videobuf2_v4l2 videobuf2_common snd_hda_core snd_hwdep snd_seq irqbypass videodev rapl intel_cstate snd_seq_device mc snd_pcm intel_uncore joydev pcspkr wmi_bmof ecdh_generic ecc intel_wmi_thunderbolt snd_timer mei_me intel_xhci_usb_role_switch snd mei roles soundcore intel_pch_thermal i2c_i801 i2c_smbus ideapad_laptop sparse_keymap rfkill acpi_pad binfmt_misc ip_tables i915 nouveau mxm_wmi ttm i2c_algo_bit rtsx_usb_sdmmc drm_kms_helper mmc_core crct10dif_pclmul crc32_pclmul crc32c_intel cec drm ghash_clmulni_intel serio_raw r8169 rtsx_usb wmi video fuse
CPU: 2 PID: 14633 Comm: kworker/2:2 Tainted: G        W         5.8.18-100.fc31.x86_64 #1
Hardware name: LENOVO 80SV/Torronto 5C1, BIOS 3JCN19WW 08/10/2016
Workqueue: events nouveau_cli_work [nouveau]
RIP: 0010:g84_bar_flush+0xaf/0xc0 [nouveau]
Code: 8b 40 10 48 8b 78 10 4c 8b 6f 50 4d 85 ed 75 03 4c 8b 2f e8 e3 3f 1b f7 4c 89 ea 48 c7 c7 94 43 7b c0 48 89 c6 e8 43 36 ae f6 <0f> 0b eb b7 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 0f 1f 44 00 00
RSP: 0000:ffffb2a101d4ba60 EFLAGS: 00010086
RAX: 000000000000001d RBX: ffff938caed3a400 RCX: 0000000000000027
RDX: 0000000000000027 RSI: 0000000000000082 RDI: ffff938cb8d18d08
RBP: ffff938cafe04648 R08: ffff938cb8d18d00 R09: 0000000000000003
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000286
R13: ffff938cb6dae460 R14: 0000000000000005 R15: ffff938cb5d2d804
FS:  0000000000000000(0000) GS:ffff938cb8d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000559536cdce38 CR3: 00000001f26a6006 CR4: 00000000003606e0
Call Trace:
 nv50_instobj_release+0x2f/0xc0 [nouveau]
 nvkm_vmm_unref_ptes+0x1e1/0x240 [nouveau]
 nvkm_vmm_iter.constprop.0+0x224/0x790 [nouveau]
 ? page_counter_cancel+0x1f/0x30
 ? __kmem_cache_shrink+0x286/0x2d0
 nvkm_vmm_ptes_unmap_put+0x2c/0x40 [nouveau]
 ? nvkm_vmm_map_choose+0x90/0x90 [nouveau]
 ? gf100_vmm_invalidate_pdb+0x30/0x30 [nouveau]
 nvkm_vmm_put_locked+0x1c5/0x210 [nouveau]
 nvkm_uvmm_mthd+0x3c6/0x770 [nouveau]
 nvkm_ioctl+0xde/0x180 [nouveau]
 nvif_object_mthd+0x104/0x130 [nouveau]
 ? sched_clock_cpu+0xc/0xa0
 ? record_times+0x15/0x90
 ? psi_group_change+0x41/0x220
 nvif_vmm_put+0x37/0x50 [nouveau]
 nouveau_vma_del+0x58/0xa0 [nouveau]
 nouveau_gem_object_delete_work+0x26/0x40 [nouveau]
 nouveau_cli_work+0xcc/0x120 [nouveau]
 process_one_work+0x1b4/0x370
 worker_thread+0x50/0x3b0
 ? process_one_work+0x370/0x370
 kthread+0xfe/0x140
 ? kthread_park+0x90/0x90
 ret_from_fork+0x22/0x30