[GSD-13675] Lunar Lake: large Level Zero allocation leaks system memory after process exit
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评估
- 难度
- 4/5
- 预计耗时
- 3-5 天
- 新手友好度
- 48/100
- Issue 类型
- 缺陷
- 描述清晰度
- 基本清楚
- 活跃度
- 活跃
- 技术栈
- cpp, linux, ubuntu
调研方向
Start by compiling and running the attached ze-memory-lifetime-repro.c with the 21,022 MiB allocation, then compare it with the 256 MiB case using free -h before and after cleanup. Trace the Level Zero allocation, zeMemFree(), context destruction, and process-exit paths; the issue is done when the large allocation no longer leaves system memory unavailable after exit.
由索引模型根据 Issue 内容生成。
描述
Pre-submission Checklist
- I am using the latest GPU driver version published by
ppa:kobuk-team/intel-graphicsfor Ubuntu 26.04 - I searched for similar issues and found none
System Information
GPU Hardware
Intel Core Ultra 7 258V / Lunar Lake Arc 140V (8086:64a0, rev 04)
DRI Devices Information
0 crw-rw----+ 1 root video 226, 1 /dev/dri/card1
0 crw-rw----+ 1 root render 226, 128 /dev/dri/renderD128
pci-0000:00:02.0-card -> ../card1
pci-0000:00:02.0-render -> ../renderD128
GPU Detailed Information (lspci output)
00:02.0 VGA compatible controller: Intel Corporation Lunar Lake [Intel Arc Graphics 130V / 140V] (rev 04)
Subsystem: Lenovo Device 233d
Region 0: Memory at 204e000000 (64-bit, prefetchable) [size=16M]
Region 2: Memory at 2000000000 (64-bit, prefetchable) [size=256M]
Kernel driver in use: xe
Kernel modules: xe
Driver Version
libze-intel-gpu1 26.31.39395.14-1~26.04~ppa1
Installed GPU Driver Packages
intel-ocloc 26.31.39395.14-1~26.04~ppa1
intel-opencl-icd 26.31.39395.14-1~26.04~ppa1
libigc2 2.40.13+ds1-1~26.04
libigdfcl2 2.40.13+ds1-1~26.04
libigdgmm12 22.10.1-1~26.04~ppa1
libze-dev 1.32.0-1~26.04~ppa1
libze-intel-gpu1 26.31.39395.14-1~26.04~ppa1
libze1 1.32.0-1~26.04~ppa1
Driver Installation Details
Installed from ppa:kobuk-team/intel-graphics.
Linux Distribution
Other: Ubuntu 26.04.1 LTS
Kernel Version & Boot Parameters
Kernel: 7.0.0-34-generic
BOOT_IMAGE=/vmlinuz-7.0.0-34-generic root=/dev/mapper/ubuntu--vg-ubuntu--lv ro quiet splash mitigations=off isolcpus=managed_irq,0-3
xe 4415488 26
gpu_sched 69632 1 xe
drm_gpuvm 57344 1 xe
drm_buddy 28672 1 xe
drm_ttm_helper 20480 1 xe
ttm 135168 2 drm_ttm_helper,xe
drm_exec 12288 2 drm_gpuvm,xe
drm_suballoc_helper 24576 1 xe
Issue Description
Actual Behavior
A large Level Zero device allocation leaves approximately 13.6 GiB of system memory unavailable after zeMemFree() returns success, the Level Zero context is destroyed, and the process exits. The memory is recovered only by rebooting.
With libze-intel-gpu1 26.31.39395.14, MemAvailable fell from 26,066,300 kB to 11,836,096 kB and remained there after approximately 50 seconds. The reproducer had exited and no xe fault or reset was logged.
A 256 MiB allocation using the same reproducer frees normally.
Expected Behavior
The backing system memory should become reclaimable after zeMemFree(), context destruction, and process exit.
Reproduction Rate
Always reproduces — 100%
Steps to Reproduce
Using the attached reproducer:
free -h
./ze-memory-lifetime-repro 21022
sleep 20
free -h
The program allocates 21,022 MiB with ZE_RELAXED_ALLOCATION_LIMITS_EXP_FLAG_MAX_SIZE, touches the allocation from the GPU, synchronizes, frees it, destroys the context, and exits normally.
Diagnostics & Logs
System Logs / dmesg Output
No GPU fault or reset was logged during reproduction.
Reproducer Information
Source Code / Reproducer
While this issue was originally encountered using a SYCL build of llama.cpp, the reproducer above relies only on raw Level Zero.
Command Line / Application Details
./ze-memory-lifetime-repro 21022
A 256 MiB control run does not leak:
./ze-memory-lifetime-repro 256
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intel/compute-runtime 的其他 Issue
-
难度 2/5 1-3 小时 新手友好度 78/100
intel/compute-runtime#943 ·
-
难度 1/5 1 小时以内 新手友好度 1/100
intel/compute-runtime#1022 ·
-
难度 4/5 3-5 天 新手友好度 35/100
intel/compute-runtime#1019 ·
-
OS: Linux Type: Bug
难度 4/5 3-5 天 新手友好度 34/100
intel/compute-runtime#1017 ·
-
Component: Level Zero Sysman Status: Needs Feedback
难度 4/5 3-5 天 新手友好度 48/100
intel/compute-runtime#1013 · 1 条评论 ·
查看 intel/compute-runtime 的全部 Issue
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