apport information
** Tags added: apport-collected resolute
** Description changed:
Request:
Please SRU-backport upstream Linux commit
046045543e530605c441063535e7dca0075369a6 to the Ubuntu linux source package for
the Ubuntu 26.04 resolute 7.0 GA kernel line.
Commit:
drm/xe/pt: Reset current_op in xe_pt_update_ops_init()
Fixes: e8babb280b5e ("drm/xe: Convert multiple bind ops into single job")
The upstream commit is marked Cc: [email protected].
Affected system:
Ubuntu 26.04 resolute
Kernel: 7.0.0-31-generic
GPU: Intel Arc Pro B70, PCI ID 8086:e223, using the xe driver
Secure Boot is enabled, so a signed Ubuntu kernel is required.
Impact:
The host experiences a kernel Oops followed by soft lockups and RCU stalls.
Userland becomes unresponsive: SSH hangs, Frigate API hangs, and the host
requires a cold power-off to recover.
Trigger:
A llama.cpp SYCL VLM workload on the Arc Pro B70 causes heavy VRAM
bind/eviction activity through xe_vm_bind_ioctl. The incidents occurred on
2026-09-13 and 2026-09-15 with the same signature.
Why this commit matches:
The crash path goes through xe_vm_bind_ioctl, xe_bo_validate,
ttm_bo_validate, ttm_bo_alloc_resource, ttm_lru_walk_for_evict, ttm_bo_evict,
xe_bo_move_notify, xe_bo_trigger_rebind, and xe_pt_zap_ptes. A second Oops
occurred in ttm_resource_manager_next on the same eviction path.
The installed 7.0.0-31 xe.ko already appears to contain the earlier
xe_pt_zap_ptes_entry NULL guard, so this report is specifically
requesting the current_op retry fix in commit
046045543e530605c441063535e7dca0075369a6.
Primary Oops excerpt:
BUG: kernel NULL pointer dereference, address: 0000000000000018
CPU: 3 PID: 1919934 Comm: llama-server
Kernel: 7.0.0-31-generic
RIP: xe_pt_zap_ptes+0x97/0x110 [xe]
Call trace includes:
xe_vm_invalidate_vma
xe_bo_trigger_rebind
xe_bo_move_notify
ttm_bo_evict
ttm_lru_walk_for_evict
ttm_bo_alloc_resource
ttm_bo_validate
xe_bo_validate
xe_vm_bind_ioctl
Secondary Oops excerpt:
BUG: unable to handle page fault
CPU: 0 PID: 1942263 Comm: llama-server
RIP: ttm_resource_manager_next+0x116/0x300 [ttm]
Call trace includes:
ttm_resource_manager_first
ttm_lru_walk_for_evict
ttm_bo_alloc_resource
ttm_bo_validate
xe_bo_validate
xe_vm_bind_ioctl
Proposed fix:
Backport upstream commit 046045543e530605c441063535e7dca0075369a6 to the
Ubuntu 26.04 resolute 7.0 GA linux kernel line.
Verification plan:
Boot a signed Ubuntu 7.0 kernel containing the patch.
Re-run the failing B70 SYCL VLM workload under sustained VRAM eviction
pressure.
Confirm no xe_pt_zap_ptes Oops, ttm_resource_manager_next Oops, soft lockup,
RCU stall, or cold-power recovery requirement over a 24 to 72 hour soak.
Regression risk:
Low. The requested change is a small xe page-table operation fix already
upstream and marked for stable backport.
Attachments:
version.log
lspci-vvnn.log
linux2-kernel-oops-20260915.log
+ ---
+ ProblemType: Bug
+ ApportVersion: 2.34.1-0ubuntu0.1
+ Architecture: amd64
+ AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/controlC1',
'/dev/snd/hwC1D2', '/dev/snd/pcmC1D9p', '/dev/snd/pcmC1D8p',
'/dev/snd/pcmC1D7p', '/dev/snd/pcmC1D3p', '/dev/snd/by-path',
'/dev/snd/controlC0', '/dev/snd/hwC0D2', '/dev/snd/hwC0D0',
'/dev/snd/pcmC0D9p', '/dev/snd/pcmC0D8p', '/dev/snd/pcmC0D7p',
'/dev/snd/pcmC0D3p', '/dev/snd/pcmC0D2c', '/dev/snd/pcmC0D0c',
'/dev/snd/pcmC0D0p', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
+ CasperMD5CheckResult: pass
+ DistroRelease: Ubuntu 26.04
+ InstallationDate: Installed on 2025-12-20 (269 days ago)
+ InstallationMedia: Ubuntu 22.04.5 LTS "Jammy Jellyfish" - Release amd64
(20240911)
+ Lsusb:
+ Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
+ Bus 001 Device 002: ID 0764:0601 Cyber Power System, Inc. PR1500LCDRT2U UPS
+ Bus 001 Device 003: ID 413d:2114 SONiX AMAZON MD005 Wired Keyboard
+ Bus 001 Device 004: ID 1d6b:0104 Linux Foundation Multifunction Composite
Gadget
+ Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
+ MachineType: Micro-Star International Co., Ltd. MS-7E02
+ Package: linux (not installed)
+ ProcEnviron:
+ LANG=en_US.UTF-8
+ PATH=(custom, no user)
+ SHELL=/bin/bash
+ TERM=xterm-256color
+ ProcFB:
+ 0 xedrmfb
+ 1 i915drmfb
+ ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-31-generic
root=UUID=13324c7c-d3a2-42b4-a278-d4c23753bb29 ro fbcon=nodefer
video=HDMI-A-2:1920x1080@60e fbcon=map:10
crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M
+ ProcVersionSignature: Ubuntu 7.0.0-31.31-generic 7.0.14
+ PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No
PulseAudio daemon running, or not running as session daemon.
+ RfKill:
+
+ Tags: resolute
+ Uname: Linux 7.0.0-31-generic x86_64
+ UpgradeStatus: Upgraded to resolute on 2026-07-25 (52 days ago)
+ UserGroups: N/A
+ _MarkForUpload: True
+ dmi.bios.date: 08/04/2025
+ dmi.bios.release: 5.32
+ dmi.bios.vendor: American Megatrends International, LLC.
+ dmi.bios.version: 1.F0
+ dmi.board.asset.tag: Default string
+ dmi.board.name: PRO B760M-P DDR4 (MS-7E02)
+ dmi.board.vendor: Micro-Star International Co., Ltd.
+ dmi.board.version: 1.0
+ dmi.chassis.asset.tag: Default string
+ dmi.chassis.type: 3
+ dmi.chassis.vendor: Micro-Star International Co., Ltd.
+ dmi.chassis.version: 1.0
+ dmi.modalias:
dmi:bvnAmericanMegatrendsInternational,LLC.:bvr1.F0:bd08/04/2025:br5.32:svnMicro-StarInternationalCo.,Ltd.:pnMS-7E02:pvr1.0:rvnMicro-StarInternationalCo.,Ltd.:rnPROB760M-PDDR4(MS-7E02):rvr1.0:cvnMicro-StarInternationalCo.,Ltd.:ct3:cvr1.0:skuDefaultstring:pfaDefaultstring:
+ dmi.product.family: Default string
+ dmi.product.name: MS-7E02
+ dmi.product.sku: Default string
+ dmi.product.version: 1.0
+ dmi.sys.vendor: Micro-Star International Co., Ltd.
** Attachment added: "AlsaInfo.txt"
https://bugs.launchpad.net/bugs/2167337/+attachment/6000409/+files/AlsaInfo.txt
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https://bugs.launchpad.net/bugs/2167337
Title:
SRU: backport drm/xe current_op fix 0460455 for Intel Arc Pro B70 host
wedge
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