Description of problem:
Multi GPU setup.

Original GPU was an AMD RX580
Additional GPU is an nVidia GTX 970

The nVidia drivers had not yet been installed... thus the AMD drivers were handling the blit to the displays plugging into the nVidia GPU.
That made things pretty unstable, numerous hard lockups until I installed the nvidia_drm drivers
 
I'm now unable to use the display connected to the AMD GPU, but the system is otherwise now stable.

Additional info:
reporter:       libreport-2.17.11
WARNING: CPU: 1 PID: 25 at drivers/gpu/drm/nouveau/nvkm/falcon/gm200.c:231 gm200_flcn_fw_boot+0x2b8/0x400 [nouveau]
Modules linked in: uinput rfcomm snd_seq_dummy snd_hrtimer hid_logitech_hidpp xt_CHECKSUM uhid xt_MASQUERADE xt_conntrack ipt_REJECT nf_nat_tftp nf_conntrack_tftp nf_conntrack_netbios_ns nf_conntrack_broadcast nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 bridge nft_reject nft_ct stp llc nft_chain_nat ip6table_nat ip6table_mangle ip6table_raw ip6table_security iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 iptable_mangle iptable_raw iptable_security ip_set nf_tables nfnetlink sunrpc ip6table_filter iptable_filter qrtr bnep binfmt_misc squashfs vfat fat snd_soc_avs snd_soc_hda_codec snd_hda_ext_core ath10k_pci snd_soc_core snd_compress intel_rapl_msr ath10k_core iTCO_wdt intel_pmc_bxt ac97_bus snd_pcm_dmaengine snd_hda_codec_realtek iTCO_vendor_support snd_hda_codec_generic snd_hda_codec_hdmi ee1004 mei_pxp intel_rapl_common snd_hda_intel mei_hdcp snd_intel_dspcfg intel_tcc_cooling mac80211 snd_intel_sdw_acpi x86_pkg_temp_thermal snd_hda_codec
 snd_hda_core intel_powerclamp coretemp snd_hwdep eeepc_wmi btusb asus_wmi btrtl ledtrig_audio btbcm rapl sparse_keymap snd_seq platform_profile libarc4 intel_cstate snd_seq_device ath btintel i2c_i801 wmi_bmof btmtk intel_uncore i2c_smbus pcspkr cfg80211 snd_pcm bluetooth snd_timer mei_me snd rfkill corsair_psu mei soundcore joydev acpi_pad loop zram amdgpu uas usb_storage nouveau crct10dif_pclmul iommu_v2 drm_buddy crc32_pclmul gpu_sched crc32c_intel nvme mxm_wmi i2c_algo_bit drm_ttm_helper polyval_clmulni ttm polyval_generic e1000e nvme_core drm_display_helper ghash_clmulni_intel sha512_ssse3 nvme_common cec video wmi scsi_dh_rdac scsi_dh_emc scsi_dh_alua ip6_tables ip_tables dm_multipath fuse
CPU: 1 PID: 25 Comm: kworker/1:0 Not tainted 6.3.8-200.fc38.x86_64 #1
Hardware name: System manufacturer System Product Name/STRIX Z270G GAMING, BIOS 1501 07/13/2021
Workqueue: events nvkm_runl_work [nouveau]
RIP: 0010:gm200_flcn_fw_boot+0x2b8/0x400 [nouveau]
Code: 8b 40 10 48 8b 78 10 4c 8b 6f 50 4d 85 ed 75 03 4c 8b 2f e8 aa db 48 f9 4c 89 ea 48 c7 c7 dc 78 80 c0 48 89 c6 e8 38 c4 ad f8 <0f> 0b 41 be 01 00 00 00 41 bf 92 ff ff ff e9 69 fe ff ff 85 c9 75
RSP: 0018:ffffaaac80157c48 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffff9ebbc540d8b8 RCX: 0000000000000027
RDX: ffff9ec33ec61548 RSI: 0000000000000001 RDI: ffff9ec33ec61540
RBP: 0000000000000010 R08: 0000000000000000 R09: ffffaaac80157ad8
R10: 0000000000000003 R11: ffffffffbb146108 R12: 0000000000000000
R13: ffff9ebbc0c6ccd0 R14: 0000000000000000 R15: ffff9ebbc540d8b8
FS:  0000000000000000(0000) GS:ffff9ec33ec40000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005582deaa7138 CR3: 0000000162fb6002 CR4: 00000000003706e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ? gm200_flcn_fw_boot+0x2b8/0x400 [nouveau]
 ? __warn+0x81/0x130
 ? gm200_flcn_fw_boot+0x2b8/0x400 [nouveau]
 ? report_bug+0x171/0x1a0
 ? prb_read_valid+0x1b/0x30
 ? handle_bug+0x3c/0x80
 ? exc_invalid_op+0x17/0x70
 ? asm_exc_invalid_op+0x1a/0x20
 ? gm200_flcn_fw_boot+0x2b8/0x400 [nouveau]
 ? gm200_flcn_fw_boot+0x2b8/0x400 [nouveau]
 nvkm_falcon_fw_boot+0x1f6/0x5e0 [nouveau]
 nvkm_acr_hsfw_boot+0x7d/0xa0 [nouveau]
 nvkm_acr_bootstrap_falcons+0x165/0x190 [nouveau]
 gf100_gr_init_ctxctl_ext+0x67/0x570 [nouveau]
 ? gf100_gr_init+0x52c/0x5a0 [nouveau]
 gf100_gr_init_+0x99/0x140 [nouveau]
 nvkm_engine_init+0x38/0xa0 [nouveau]
 nvkm_runl_rc+0x27d/0x3d0 [nouveau]
 ? nouveau_fence_is_signaled+0x3c/0x50 [nouveau]
 nvkm_runl_work+0x26/0x30 [nouveau]
 process_one_work+0x1c4/0x3d0
 worker_thread+0x51/0x390
 ? __pfx_worker_thread+0x10/0x10
 kthread+0xdb/0x110
 ? __pfx_kthread+0x10/0x10
 ret_from_fork+0x29/0x50
 </TASK>

Potential duplicate: bug 2212586