Hello Marc, thanks for submitting a bug report. May I ask if this is a new regression? Did it work before, but start misbehaving after a kernel update? Has it ever worked? Thanks. ** Changed in: linux (Ubuntu) Assignee: (unassigned) => Benjamin Wheeler (benjaminwheeler) ** Changed in: linux (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are subscribed to linux in Ubuntu. Matching subscriptions: Bgg, Bmail, Nb https://bugs.launchpad.net/bugs/2166226 Title: [amdgpu][Navi 23/RX 6600] system-wide stalls followed by SDMA1 reset hang in sdma_v5_2_stop_queue on 7.0.0-30 Status in linux package in Ubuntu: Incomplete Bug description: Ubuntu: 26.04.1 LTS Kernel: 7.0.0-30-generic, package 7.0.0-30.30 GPU: AMD Navi 23 / RX 6600 [1002:73ff], subsystem [1849:5217] Mesa: 26.0.8-1ubuntu0.3 linux-firmware: 20260319.git217ca6e4.1ubuntu The desktop first began stuttering and later stopped responding. At 16:41:37, amdgpu began reporting "Fence fallback timer expired". SysRq/NMI stack dumps repeatedly caught CPU 7 in amdgpu_device_rreg() from the display/vblank IRQ handler, while other CPUs were waiting in smp_call_function_many_cond(). AMDGPU later reported: ring sdma1 timeout, signaled seq=72398, emitted seq=72398 Starting sdma1 ring reset The reset did not complete. Repeated stack dumps for over three minutes showed the amdgpu-reset-dev worker in: amdgpu_device_rreg sdma_v5_2_stop_queue amdgpu_sdma_reset_engine sdma_v5_2_reset_queue amdgpu_job_timedout drm_sched_job_timedout Four seconds before the first amdgpu warning, an ASMedia ASM4242 USB4 bridge at 17:00.0 reported that it could not transition from D3cold to D0. This is on a different PCIe root port, so its relationship is unknown. The kernel is tainted P/O because this is a ZFS-root system using the ZFS DKMS module. The amdgpu module itself is the stock Ubuntu kernel module. Frequency: Happens pretty reliably within 24 hours of boot Recovery required: Requires hard reset USB4 activity at the time: None ProblemType: Bug DistroRelease: Ubuntu 26.04 Package: linux-image-7.0.0-30-generic 7.0.0-30.30 ProcVersionSignature: Ubuntu 7.0.0-30.30-generic 7.0.12 Uname: Linux 7.0.0-30-generic x86_64 NonfreeKernelModules: zfs ApportVersion: 2.34.1-0ubuntu0.1 Architecture: amd64 CasperMD5CheckResult: unknown CurrentDesktop: KDE Date: Wed Sep 2 17:11:37 2026 IwDevWlp16s0Link: Not connected. MachineType: Micro-Star International Co., Ltd. MS-7E70 ProcFB: 0 amdgpudrmfb ProcKernelCmdLine: BOOT_IMAGE=/BOOT/ubuntu_5ck8oa@/vmlinuz-7.0.0-30-generic root=ZFS=rpool/ROOT/ubuntu_5ck8oa ro init_on_alloc=0 nmi_watchdog=1 softlockup_panic=1 hardlockup_panic=1 crashkernel=1G crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon. SourcePackage: linux UpgradeStatus: Upgraded to resolute on 2026-07-05 (59 days ago) dmi.bios.date: 09/24/2025 dmi.bios.release: 5.35 dmi.bios.vendor: American Megatrends International, LLC. dmi.bios.version: 2.A31 dmi.board.asset.tag: To be filled by O.E.M. dmi.board.name: PRO X870E-P WIFI (MS-7E70) dmi.board.vendor: Micro-Star International Co., Ltd. dmi.board.version: 2.0 dmi.chassis.asset.tag: To be filled by O.E.M. dmi.chassis.type: 3 dmi.chassis.vendor: Micro-Star International Co., Ltd. dmi.chassis.version: 2.0 dmi.modalias: dmi:bvnAmericanMegatrendsInternational,LLC.:bvr2.A31:bd09/24/2025:br5.35:svnMicro-StarInternationalCo.,Ltd.:pnMS-7E70:pvr2.0:rvnMicro-StarInternationalCo.,Ltd.:rnPROX870E-PWIFI(MS-7E70):rvr2.0:cvnMicro-StarInternationalCo.,Ltd.:ct3:cvr2.0:skuTobefilledbyO.E.M.:pfaTobefilledbyO.E.M.: dmi.product.family: To be filled by O.E.M. dmi.product.name: MS-7E70 dmi.product.sku: To be filled by O.E.M. dmi.product.version: 2.0 dmi.sys.vendor: Micro-Star International Co., Ltd. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2166226/+subscriptions
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