Public bug reported:
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.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
** Attachment added: "Remotely captured kernel logs"
https://bugs.launchpad.net/bugs/2166226/+attachment/5997023/+files/playground2.hang.log
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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
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