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[GSD-13675] Lunar Lake: large Level Zero allocation leaks system memory after process exit

Aperta
  • Qualcosa non va?
#1,016 3 commenti 0 reazioni 0 assegnatari Vedi su GitHub

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Valutazione

Difficoltà
4/5
Tempo stimato
3-5 giorni
Idoneità per principianti
48/100
Tipo di issue
Bug
Chiarezza
Abbastanza chiara
Stato di attività
Attiva
Stack tecnologico
cpp, linux, ubuntu
Ambito
backend, computer-graphics, operating-systems

Direzione di ricerca

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.

Scritto dal modello di indicizzazione a partire dal testo della issue.

Descrizione

OS: Linux Type: Bug

Pre-submission Checklist

  • I am using the latest GPU driver version published by ppa:kobuk-team/intel-graphics for 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

ze-memory-lifetime-repro.c

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
Lingua principale
C++
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