Description of problem:
I have no idea -- other than the message showed up in my notices. 

Additional info:
reporter:       libreport-2.10.1
WARNING: CPU: 1 PID: 72 at drivers/gpu/drm/nouveau/include/nvkm/subdev/i2c.h:172 nouveau_dp_detect+0x9a/0x220 [nouveau]
Modules linked in: uinput thunderbolt fuse rfcomm ccm xt_CHECKSUM ipt_MASQUERADE tun bridge stp llc nf_conntrack_netbios_ns nf_conntrack_broadcast xt_CT ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 ipt_REJECT nf_reject_ipv4 xt_conntrack ebtable_nat 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 libcrc32c ip_set nfnetlink ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables cmac bnep sunrpc vfat fat usblp arc4 iTCO_wdt iTCO_vendor_support mei_wdt mei_hdcp snd_hda_codec_hdmi intel_rapl x86_pkg_temp_thermal intel_powerclamp iwlmvm coretemp kvm_intel snd_hda_codec_realtek mac80211 snd_hda_codec_generic kvm snd_hda_intel snd_hda_codec snd_hda_core irqbypass iwlwifi intel_cstate snd_hwdep intel_uncore snd_seq btusb snd_seq_device intel_rapl_perf btrtl snd_pcm btbcm btintel cfg80211 bluetooth uvcvideo intel_wmi_thunderbolt wmi_bmof videobuf2_vmalloc
 videobuf2_memops videobuf2_v4l2 videobuf2_common i2c_i801 rtsx_pci_ms videodev snd_timer memstick mei_me joydev idma64 media mei intel_lpss_pci intel_pch_thermal ecdh_generic thinkpad_acpi intel_lpss ledtrig_audio ie31200_edac snd soundcore acpi_pad rfkill pcc_cpufreq dm_crypt i915 nouveau rtsx_pci_sdmmc mxm_wmi crct10dif_pclmul ttm mmc_core crc32_pclmul i2c_algo_bit crc32c_intel drm_kms_helper nvme e1000e drm ghash_clmulni_intel nvme_core serio_raw rtsx_pci wmi i2c_hid pinctrl_sunrisepoint video pinctrl_intel
CPU: 1 PID: 72 Comm: kworker/1:1 Not tainted 5.1.16-300.fc30.x86_64 #1
Hardware name: LENOVO 20HHCTO1WW/20HHCTO1WW, BIOS N1UET74W (1.48 ) 04/20/2019
Workqueue: events nouveau_display_hpd_work [nouveau]
RIP: 0010:nouveau_dp_detect+0x9a/0x220 [nouveau]
Code: 8d 4c 24 0c 4c 8d 44 24 10 4c 89 ef ba 09 00 00 00 be 01 00 00 00 e8 f5 73 f8 ff 85 c0 0f 85 49 01 00 00 80 7c 24 0c 08 74 02 <0f> 0b 4c 89 ef e8 fc 71 f8 ff 44 0f b6 44 24 11 0f b6 4c 24 12 8b
RSP: 0018:ffffb97281e4fcc0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff9ee0e5a08c00 RCX: ffffb97281e4fccc
RDX: ffffb97281e4fc70 RSI: ffffb9728400d9f4 RDI: ffffb9728400d9f4
RBP: ffff9ee0e2e18800 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000000 R11: ffff9ee0e2e18a00 R12: ffff9ee0ed2dc000
R13: ffff9ee0e2e1d000 R14: ffff9ee0e2e18800 R15: ffff9ee0e5a08c18
FS:  0000000000000000(0000) GS:ffff9ee0ef640000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f52c75a8020 CR3: 000000046af9c006 CR4: 00000000003606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 ? _cond_resched+0x15/0x30
 nouveau_connector_detect+0xf3/0x450 [nouveau]
 ? __switch_to_asm+0x41/0x70
 ? _cond_resched+0x15/0x30
 ? ww_mutex_lock+0x13/0x70
 ? drm_modeset_lock+0x7b/0x100 [drm]
 drm_helper_probe_detect_ctx+0x8b/0xe0 [drm_kms_helper]
 drm_helper_hpd_irq_event+0xa7/0x120 [drm_kms_helper]
 nouveau_display_hpd_work+0x2b/0x60 [nouveau]
 process_one_work+0x19d/0x380
 worker_thread+0x50/0x3b0
 kthread+0xfb/0x130
 ? process_one_work+0x380/0x380
 ? kthread_park+0x90/0x90
 ret_from_fork+0x35/0x40

Potential duplicate: bug 1591635