syslog 50GB in a few hours

[alukard black]

I have a Radeon RX 5700 XT
Using:
Ubuntu 18.04
kernels 5.3.41 42 43 45
mesa drivers 20.1 19.3

I don't know which package is the problem, I only know it's related to GPU
And I saw the same issue here:
https://gitlab.freedesktop.org/drm/amd/issues/912#login-pane

The following message is repeated many times per second and is filling my logs
/var/log/kern.log and syslog

Mar 31 12:52:24 Amaterasu kernel: [ 1217.976843] WARNING: CPU: 5 PID: 6277 at /build/linux-hwe-UUUsac/linux-hwe-5.3.0/drivers/gpu/drm/amd/amdgpu/../display/dc/dcn20/dcn20_hwseq.c:1999 dcn20_setup_gsl_group_as_lock+0x20e/0x230 [amdgpu]
Mar 31 12:52:24 Amaterasu kernel: [ 1217.976844] Modules linked in: nls_utf8 ntfs nf_conntrack_netlink nfnetlink xfrm_user xfrm_algo br_netfilter pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) xt_CHECKSUM iptable_mangle xt_MASQUERADE iptable_nat bridge stp llc ebtable_filter ebtables aufs overlay binfmt_misc nls_iso8859_1 edac_mce_amd snd_hda_codec_realtek kvm_amd snd_hda_codec_generic ledtrig_audio kvm snd_hda_codec_hdmi irqbypass snd_hda_intel snd_intel_nhlt snd_hda_codec amdgpu snd_hda_core snd_hwdep snd_pcm crct10dif_pclmul snd_seq_midi crc32_pclmul snd_seq_midi_event input_leds joydev ghash_clmulni_intel snd_rawmidi amd_iommu_v2 gpu_sched snd_seq ttm drm_kms_helper snd_seq_device aesni_intel snd_timer drm snd aes_x86_64 crypto_simd i2c_algo_bit fb_sys_fops syscopyarea cryptd sysfillrect glue_helper wmi_bmof sysimgblt k10temp ccp soundcore mac_hid ip6t_REJECT nf_reject_ipv6 nf_log_ipv6 xt_hl ip6t_rt ipt_REJECT nf_reject_ipv4 nf_log_ipv4 nf_log_common xt_LOG xt_limit xt_tcpudp xt_addrtype xt_conntrack
Mar 31 12:52:24 Amaterasu kernel: [ 1217.976865] ip6table_filter ip6_tables nf_conntrack_netbios_ns nf_conntrack_broadcast sch_fq_codel nf_nat_ftp nf_nat nf_conntrack_ftp nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c parport_pc iptable_filter bpfilter ppdev sunrpc lp parport ip_tables x_tables autofs4 hid_generic usbhid hid uas usb_storage nvme i2c_piix4 r8169 ahci nvme_core realtek libahci wmi gpio_amdpt gpio_generic
Mar 31 12:52:24 Amaterasu kernel: [ 1217.976876] CPU: 5 PID: 6277 Comm: kworker/u64:0 Tainted: G W OE 5.3.0-45-generic #37~18.04.1-Ubuntu
Mar 31 12:52:24 Amaterasu kernel: [ 1217.976877] Hardware name: Micro-Star International Co., Ltd MS-7C02/B450 TOMAHAWK MAX (MS-7C02), BIOS 3.50 11/07/2019
Mar 31 12:52:24 Amaterasu kernel: [ 1217.976882] Workqueue: events_unbound commit_work [drm_kms_helper]
Mar 31 12:52:24 Amaterasu kernel: [ 1217.976929] RIP: 0010:dcn20_setup_gsl_group_as_lock+0x20e/0x230 [amdgpu]
Mar 31 12:52:24 Amaterasu kernel: [ 1217.976934] Code: 02 00 00 fb e9 01 ff ff ff 48 c7 c7 40 25 16 c1 e8 6a 94 6e ce 0f 0b 48 c7 c7 40 25 16 c1 c6 83 60 02 00 00 00 e8 55 94 6e ce <0f> 0b e9 49 fe ff ff e8 26 85 67 ce 48 c7 c7 40 25 16 c1 e8 3d 94
Mar 31 12:52:24 Amaterasu kernel: [ 1217.976939] RSP: 0018:ffffa72d8953fa60 EFLAGS: 00010286
Mar 31 12:52:24 Amaterasu kernel: [ 1217.976945] RAX: 0000000000000024 RBX: ffff9c00a1af01b8 RCX: 0000000000000006
Mar 31 12:52:24 Amaterasu kernel: [ 1217.976950] RDX: 0000000000000000 RSI: 0000000000000086 RDI: ffff9c01ce757440
Mar 31 12:52:24 Amaterasu kernel: [ 1217.976954] RBP: ffffa72d8953faa8 R08: 00000000000bd121 R09: 0000000000000004
Mar 31 12:52:24 Amaterasu kernel: [ 1217.976958] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
Mar 31 12:52:24 Amaterasu kernel: [ 1217.976962] R13: 0000000000000001 R14: ffff9c01c7990000 R15: ffff9c00a1af01b8
Mar 31 12:52:24 Amaterasu kernel: [ 1217.976968] FS: 0000000000000000(0000) GS:ffff9c01ce740000(0000) knlGS:0000000000000000
Mar 31 12:52:24 Amaterasu kernel: [ 1217.976969] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Mar 31 12:52:24 Amaterasu kernel: [ 1217.976970] CR2: 00005568a4761000 CR3: 000000036deec000 CR4: 0000000000340ee0
Mar 31 12:52:24 Amaterasu kernel: [ 1217.976970] Call Trace:
Mar 31 12:52:24 Amaterasu kernel: [ 1217.977018] dcn20_pipe_control_lock.part.17+0x170/0x240 [amdgpu]
Mar 31 12:52:24 Amaterasu kernel: [ 1217.977069] dcn20_pipe_control_lock+0x1d/0x20 [amdgpu]
Mar 31 12:52:24 Amaterasu kernel: [ 1217.977122] dc_commit_updates_for_stream+0x1099/0x1380 [amdgpu]
Mar 31 12:52:24 Amaterasu kernel: [ 1217.977137] ? drm_vblank_enable+0x4b/0x140 [drm]
Mar 31 12:52:24 Amaterasu kernel: [ 1217.977185] amdgpu_dm_atomic_commit_tail+0x109a/0x1e20 [amdgpu]
Mar 31 12:52:24 Amaterasu kernel: [ 1217.977189] ? update_load_avg+0x82/0x620
Mar 31 12:52:24 Amaterasu kernel: [ 1217.977191] ? __switch_to_asm+0x34/0x70
Mar 31 12:52:24 Amaterasu kernel: [ 1217.977192] ? __switch_to_asm+0x40/0x70
Mar 31 12:52:24 Amaterasu kernel: [ 1217.977193] ? __switch_to_asm+0x34/0x70
Mar 31 12:52:24 Amaterasu kernel: [ 1217.977194] ? __switch_to_asm+0x40/0x70
Mar 31 12:52:24 Amaterasu kernel: [ 1217.977195] ? __switch_to_asm+0x34/0x70
Mar 31 12:52:24 Amaterasu kernel: [ 1217.977195] ? __switch_to_asm+0x40/0x70
Mar 31 12:52:24 Amaterasu kernel: [ 1217.977196] ? __switch_to_asm+0x34/0x70
Mar 31 12:52:24 Amaterasu kernel: [ 1217.977197] ? __switch_to_asm+0x40/0x70
Mar 31 12:52:24 Amaterasu kernel: [ 1217.977198] ? __switch_to_asm+0x34/0x70
Mar 31 12:52:24 Amaterasu kernel: [ 1217.977199] ? __switch_to_asm+0x40/0x70
Mar 31 12:52:24 Amaterasu kernel: [ 1217.977200] ? __switch_to_asm+0x34/0x70
Mar 31 12:52:24 Amaterasu kernel: [ 1217.977201] ? __switch_to_asm+0x40/0x70
Mar 31 12:52:24 Amaterasu kernel: [ 1217.977202] ? __switch_to_asm+0x34/0x70
Mar 31 12:52:24 Amaterasu kernel: [ 1217.977202] ? __switch_to_asm+0x40/0x70
Mar 31 12:52:24 Amaterasu kernel: [ 1217.977203] ? __switch_to_asm+0x34/0x70
Mar 31 12:52:24 Amaterasu kernel: [ 1217.977204] ? __switch_to_asm+0x40/0x70
Mar 31 12:52:24 Amaterasu kernel: [ 1217.977206] ? _cond_resched+0x19/0x40
Mar 31 12:52:24 Amaterasu kernel: [ 1217.977208] ? wait_for_completion_timeout+0x38/0x140
Mar 31 12:52:24 Amaterasu kernel: [ 1217.977209] ? __switch_to_asm+0x40/0x70
Mar 31 12:52:24 Amaterasu kernel: [ 1217.977210] ? __switch_to_asm+0x34/0x70
Mar 31 12:52:24 Amaterasu kernel: [ 1217.977211] ? __switch_to_asm+0x40/0x70
Mar 31 12:52:24 Amaterasu kernel: [ 1217.977212] ? __switch_to_asm+0x34/0x70
Mar 31 12:52:24 Amaterasu kernel: [ 1217.977213] ? __switch_to_asm+0x40/0x70
Mar 31 12:52:24 Amaterasu kernel: [ 1217.977218] commit_tail+0x42/0x70 [drm_kms_helper]
Mar 31 12:52:24 Amaterasu kernel: [ 1217.977222] ? commit_tail+0x42/0x70 [drm_kms_helper]
Mar 31 12:52:24 Amaterasu kernel: [ 1217.977226] commit_work+0x12/0x20 [drm_kms_helper]
Mar 31 12:52:24 Amaterasu kernel: [ 1217.977229] process_one_work+0x1fd/0x3f0
Mar 31 12:52:24 Amaterasu kernel: [ 1217.977230] worker_thread+0x34/0x410
Mar 31 12:52:24 Amaterasu kernel: [ 1217.977231] kthread+0x121/0x140
Mar 31 12:52:24 Amaterasu kernel: [ 1217.977232] ? process_one_work+0x3f0/0x3f0
Mar 31 12:52:24 Amaterasu kernel: [ 1217.977233] ? kthread_park+0xb0/0xb0
Mar 31 12:52:24 Amaterasu kernel: [ 1217.977234] ret_from_fork+0x22/0x40
Mar 31 12:52:24 Amaterasu kernel: [ 1217.977235] ---[ end trace 2aeb16ad8d76cbe1 ]---

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-5.3.0-45-generic 5.3.0-45.37~18.04.1
ProcVersionSignature: Ubuntu 5.3.0-45.37~18.04.1-generic 5.3.18
Uname: Linux 5.3.0-45-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.13
Architecture: amd64
CurrentDesktop: ubuntu-communitheme:ubuntu:GNOME
Date: Tue Mar 31 12:53:38 2020
InstallationDate: Installed on 2020-01-28 (63 days ago)
InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
SourcePackage: linux-signed-hwe
UpgradeStatus: No upgrade log present (probably fresh install)

[alukard black (alukardz)]

I also tried with or without oibaf amd mesa drivers the issue remains.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Mikko Tanner (shapemaker)]

I have gotten the same kind of errors involving "dcn20_setup_gsl_group_as_lock" function both with in-kernel and AMD's own Pro driver. This happens every time when I run either a game or a video player in fullscreen mode. Additionally any kind of monitor screensaver or power saving mode will sooner or later cause a GPU crash which kills the whole window manager.

The amdgpu driver is laughably buggy (in addition to RX 5700 apparently having hardware bugs involving GPU resets which require either silicon fixes or firmware microcode updates). Been waiting for about half a year for working drivers, still waiting...