Aug 21 17:08:54 jak-t14-g3 kernel: amdgpu 0000:04:00.0: amdgpu: [gfxhub] page fault (src_id:0 ring:40 vmid:1 pasid:32782, for process firefox pid 1163281 thread firefox:cs0 pid 1163466) Aug 21 17:08:54 jak-t14-g3 kernel: amdgpu 0000:04:00.0: amdgpu: in page starting at address 0x0000800111ec0000 from client 0x1b (UTCL2) Aug 21 17:08:54 jak-t14-g3 kernel: amdgpu 0000:04:00.0: amdgpu: GCVM_L2_PROTECTION_FAULT_STATUS:0x00000000 Aug 21 17:08:54 jak-t14-g3 kernel: amdgpu 0000:04:00.0: amdgpu: Faulty UTCL2 client ID: CB/DB (0x0) Aug 21 17:08:54 jak-t14-g3 kernel: amdgpu 0000:04:00.0: amdgpu: MORE_FAULTS: 0x0 Aug 21 17:08:54 jak-t14-g3 kernel: amdgpu 0000:04:00.0: amdgpu: WALKER_ERROR: 0x0 Aug 21 17:08:54 jak-t14-g3 kernel: amdgpu 0000:04:00.0: amdgpu: PERMISSION_FAULTS: 0x0 Aug 21 17:08:54 jak-t14-g3 kernel: amdgpu 0000:04:00.0: amdgpu: MAPPING_ERROR: 0x0 Aug 21 17:08:54 jak-t14-g3 kernel: amdgpu 0000:04:00.0: amdgpu: RW: 0x0 Aug 21 17:09:04 jak-t14-g3 kernel: [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring gfx_0.0.0 timeout, but soft recovered

I'm sorry I don't have more information than the dmesg output but firefox (snap) just hang; bug could be either mesa or kernel (I mean generally I'd say that if userspace can DoS the GPU that's also a kernel bug regardless but YMMV)

ProblemType: Bug
DistroRelease: Ubuntu 23.10
Package: linux-image-6.3.0-7-generic 6.3.0-7.7+1
ProcVersionSignature: Ubuntu 6.3.0-7.7-generic 6.3.5
Uname: Linux 6.3.0-7-generic x86_64
ApportVersion: 2.27.0-0ubuntu2
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: GNOME
Date: Mon Aug 21 17:09:36 2023
InstallationDate: Installed on 2022-11-26 (268 days ago)
InstallationMedia: Ubuntu 23.04 "Lunar Lobster" - Alpha amd64 (20221126)
MachineType: {report['dmi.sys.vendor']} {report['dmi.product.name']}
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-6.3.0-7-generic root=/dev/mapper/ubuntu-root ro rootflags=subvol=@ quiet splash vt.handoff=7
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
 linux-restricted-modules-6.3.0-7-generic N/A
 linux-backports-modules-6.3.0-7-generic N/A
 linux-firmware 20230815.git0e048b06-0ubuntu1
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 03/21/2023
dmi.bios.release: 1.35
dmi.bios.vendor: LENOVO
dmi.bios.version: R23ET65W (1.35 )
dmi.board.asset.tag: Not Available
dmi.board.name: 21CF004PGE
dmi.board.vendor: LENOVO
dmi.board.version: SDK0T76538 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.ec.firmware.release: 1.28
dmi.modalias: dmi:bvnLENOVO:bvrR23ET65W(1.35):bd03/21/2023:br1.35:efr1.28:svnLENOVO:pn21CF004PGE:pvrThinkPadT14Gen3:rvnLENOVO:rn21CF004PGE:rvrSDK0T76538WIN:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_21CF_BU_Think_FM_ThinkPadT14Gen3:
dmi.product.family: ThinkPad T14 Gen 3
dmi.product.name: 21CF004PGE
dmi.product.sku: LENOVO_MT_21CF_BU_Think_FM_ThinkPad T14 Gen 3
dmi.product.version: ThinkPad T14 Gen 3
dmi.sys.vendor: LENOVO