[GSD-13448] sycl::malloc_device() failed when allocate memory size is more than 19.3GB, through the "Max memory allocation" is 30.3GB on B70

### Pre-submission Checklist

- [x] I am using the latest GPU driver version ([releases](https://github.com/intel/compute-runtime/releases))
- [x] I have searched for similar issues and found none

### GPU Hardware

B70

### DRI Devices Information

```
ls -ls /dev/dri/*
0 crw-rw----+ 1 root video 226, 0 Sep 14 21:52 /dev/dri/card0
0 crw-rw----+ 1 root video 226, 1 Sep 14 21:52 /dev/dri/card1
0 crw-rw----+ 1 root render 226, 128 Sep 14 21:52 /dev/dri/renderD128
0 crw-rw----+ 1 root render 226, 129 Sep 14 21:52 /dev/dri/renderD129

/dev/dri/by-path:
total 0
0 lrwxrwxrwx+1 root root 8 Sep 14 21:52 pci-0000:00:02.0-card -> ../card0
0 lrwxrwxrwx+1 root root 13 Sep 14 21:52 pci-0000:00:02.0-render -> ../renderD128
0 lrwxrwxrwx+1 root root 8 Sep 14 21:52 pci-0000:03:00.0-card -> ../card1
0 lrwxrwxrwx+1 root root 13 Sep 14 21:52 pci-0000:03:00.0-render -> ../renderD129

```

### GPU Detailed Information (lspci output)

```
lspci -vvv -k -s 0000:03:00.0
03:00.0 VGA compatible controller: Intel Corporation Battlemage G31 [Arc Pro B70] (prog-if 00 [VGA controller])
Subsystem: Shenzhen Gunnir Technology Development Co., Ltd Device 2742
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr+ Stepping- SERR- FastB2B- DisINTx-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- SERR-
Kernel driver in use: xe
Kernel modules: xe

```

### Driver Version

26.31.39395.13

### Installed GPU Driver Packages

```
sudo dpkg --list | grep -iE "igc|gmm|opencl|level-zero|fc|level_zero|ocloc|libze"
ii bpfcc-tools 0.35.0+ds-1ubuntu2 all tools for BPF Compiler Collection (BCC)
ii clinfo 3.0.25.02.14-1build1 amd64 Query OpenCL system information
ii elementary-xfce-icon-theme 0.22-1 all elementary icon theme modified for Xfce
ii gir1.2-libxfce4ui-2.0:amd64 4.20.2-1 amd64 Typelib file for libxfce4ui
ii gir1.2-libxfce4util-1.0:amd64 4.20.1-1build1 amd64 Typelib file for libxfce4util
ii gir1.2-xfconf-0:amd64 4.20.0-1build1 amd64 utilities for managing settings in Xfce - introspection support
ii intel-igc-core-2 2.40.13 amd64 Intel(R) Graphics Compiler for OpenCL(TM)
ii intel-igc-opencl-2 2.40.13 amd64 Intel(R) Graphics Compiler for OpenCL(TM)
ii intel-ocloc 26.31.39395.13-1~26.04~ppa1 amd64 Tool for managing Intel Compute GPU device binary format
ii intel-opencl-icd 26.31.39395.13-1~26.04~ppa1 amd64 Intel graphics compute runtime for OpenCL
ii intltool-debian 0.35.0+20060710.6build1 all Help i18n of RFC822 compliant config files
ii libbpfcc:amd64 0.35.0+ds-1ubuntu2 amd64 shared library for BPF Compiler Collection (BCC)
ii libcbor0.10:amd64 0.10.2-2ubuntu3 amd64 library for parsing and generating CBOR (RFC 7049)
ii libcgi-fast-perl 1:2.17-1 all CGI subclass for work with FCGI
ii libdebconfclient0:amd64 0.280ubuntu1 amd64 Debian Configuration Management System (C-implementation library)
ii libemail-address-xs-perl 1.05-1build5 amd64 Perl library for RFC 5322 address/group parsing and formatting
ii libexo-2-0:amd64 4.20.0-1build1 amd64 Library with extensions for Xfce (GTK-3 version)
ii libfcgi-bin 2.4.5-0.1build2 amd64 FastCGI bridge from CGI
ii libfcgi-perl 0.82+ds-3build3 amd64 helper module for FastCGI
ii libfcgi0t64:amd64 2.4.5-0.1build2 amd64 shared library of FastCGI
ii libfile-fcntllock-perl 0.22-4ubuntu6 amd64 Perl module for file locking with fcntl(2)
ii libgarcon-1-0:amd64 4.20.0-1build1 amd64 freedesktop.org compliant menu implementation for Xfce
ii libgarcon-gtk3-1-0:amd64 4.20.0-1build1 amd64 menu library for Xfce (GTK3 library)
ii libigc2 2.40.13+ds1-1~26.04 amd64 Core libraries for Intel(R) Graphics Compiler for OpenCL(TM)
ii libigdfcl2 2.40.13+ds1-1~26.04 amd64 OpenCL library for Intel(R) Graphics Compiler for OpenCL(TM)
ii libigdgmm12:amd64 22.10.1-1~26.04~ppa1 amd64 Intel Graphics Memory Management Library -- shared library
ii libmath-base85-perl 0.5+dfsg-2 all Perl extension for base 85 numbers, as referenced by RFC 1924
ii libsigc++-2.0-0v5:amd64 2.12.1-4build1 amd64 type-safe Signal Framework for C++ - runtime
ii libsigc++-3.0-0:amd64 3.6.0-2build1 amd64 type-safe Signal Framework for C++ - runtime
ii libxfce4panel-2.0-4 4.20.7-1 amd64 Xfce4 panel library (GTK3 variant)
ii libxfce4ui-2-0:amd64 4.20.2-1 amd64 widget library for Xfce - Gtk+3 variant
ii libxfce4ui-common 4.20.2-1 all common files for libxfce4ui
ii libxfce4ui-utils 4.20.2-1 amd64 Utility files for libxfce4ui
ii libxfce4util-bin 4.20.1-1build1 amd64 tools for libxfce4util
ii libxfce4util-common 4.20.1-1build1 all common files for libxfce4util
ii libxfce4util7:amd64 4.20.1-1build1 amd64 Utility functions library for Xfce4
ii libxfce4windowing-0-0:amd64 4.20.5-1 amd64 Wayland utility functions library for Xfce4
ii libxfce4windowing-common 4.20.5-1 all common files for libxfce4windowing
ii libxfconf-0-3:amd64 4.20.0-1build1 amd64 Client library for Xfce4 configure interface
ii libze-dev:amd64 1.32.0-1~26.04~ppa1 amd64 oneAPI Level Zero -- development files
ii libze-intel-gpu1 26.31.39395.13-1~26.04~ppa1 amd64 Intel oneAPI L0 support implementation for Intel GPUs -- shared library
ii libze1:amd64 1.32.0-1~26.04~ppa1 amd64 oneAPI Level Zero -- share libraries
ii linux-firmware-qlogic 20260319.git217ca6e4-0ubuntu1.1 all Firmware for QLogic SCSI, FC, and IB host bus and Ethernet adapters
ii mousepad 0.7.0-1 amd64 simple Xfce oriented text editor
ii node-punycode 2.3.1+~2.1.4-1 all Nodejs robust Punycode converter fully RFC compliant
ii node-uuid 8.3.2+~8.3.4-3 all simple and fast RFC4122 UUID generation - Node.js module
ii node-ws 8.19.0+~cs14.19.1-1 all RFC-6455 WebSocket implementation module for Node.js
ii nvidia-cuda-toolkit-doc 12.4.1-8 all NVIDIA CUDA and OpenCL documentation
ii nvidia-opencl-dev:amd64 12.4.127~12.4.1-8 amd64 NVIDIA OpenCL development files
ii nvidia-profiler 12.4.127~12.4.1-8 amd64 NVIDIA Profiler for CUDA and OpenCL
ii ocl-icd-libopencl1:amd64 2.3.4-1 amd64 Generic OpenCL ICD Loader
ii ocl-icd-opencl-dev:amd64 2.3.4-1 amd64 OpenCL development files
ii opencl-c-headers 3.0~2025.07.22-2build1 all OpenCL (Open Computing Language) C header files
ii opencl-clhpp-headers 3.0~2025.07.22-1ubuntu2 all C++ headers for OpenCL development
ii python3-bpfcc 0.35.0+ds-1ubuntu2 all Python 3 wrappers for BPF Compiler Collection (BCC)
ii python3-idna 3.11-1ubuntu0.1 all Python IDNA2008 (RFC 5891) handling (Python 3)
ii ristretto 0.13.4-1 amd64 lightweight picture-viewer for the Xfce desktop environment
ii thunar 4.20.7-1 amd64 File Manager for Xfce
ii wezterm 20240203-110809-5046fc22 amd64 Wez's Terminal Emulator.
ii xfburn 0.7.2-1build1 amd64 CD-burner application for Xfce Desktop Environment
ii xfce4-appfinder 4.20.0-2build1 amd64 Application finder for the Xfce4 desktop environment
ii xfce4-clipman 2:1.6.6-1build2 amd64 clipboard history utility
ii xfce4-clipman-plugin 2:1.6.6-1build2 amd64 clipboard history plugin for Xfce panel
ii xfce4-cpugraph-plugin:amd64 1.2.10-1build3 amd64 CPU load graph plugin for the Xfce4 panel
ii xfce4-dict 0.8.8-1build1 amd64 Dictionary plugin for Xfce4 panel
ii xfce4-helpers 4.20.1-1ubuntu2 amd64 helpers for the Xfce4 desktop environment
ii xfce4-indicator-plugin 2.4.2-1build3 amd64 plugin to display information from applications in the Xfce4 panel
ii xfce4-mailwatch-plugin 1.3.1-1build3 amd64 mail watcher plugin for the Xfce4 panel
ii xfce4-netload-plugin:amd64 1.5.0-1 amd64 network load monitor plugin for the Xfce4 panel
ii xfce4-notifyd 0.9.7-2build1 amd64 simple, visually-appealing notification daemon for Xfce
ii xfce4-panel 4.20.7-1 amd64 panel for Xfce4 desktop environment
ii xfce4-panel-profiles 1.0.15-1build1 all layout manager for the Xfce panel
ii xfce4-places-plugin:amd64 1.8.3-1build3 amd64 quick access to folders, documents and removable media
ii xfce4-power-manager 4.20.0-1build1 amd64 power manager for Xfce desktop
ii xfce4-power-manager-data 4.20.0-1build1 all power manager for Xfce desktop, arch-indep files
ii xfce4-power-manager-plugins 4.20.0-1build1 amd64 power manager plugins for Xfce panel
ii xfce4-pulseaudio-plugin:amd64 0.5.1-1 amd64 Xfce4 panel plugin to control pulseaudio
ii xfce4-screensaver 4.20.1-1build1 amd64 screen saver and locker that is integrated with the xfce4 desktop
ii xfce4-screenshooter 1.11.1-1build1 amd64 screenshots utility for Xfce
ii xfce4-session 4.20.4-1 amd64 Xfce4 Session Manager
ii xfce4-settings 4.20.1-1ubuntu2 amd64 graphical application for managing Xfce settings
ii xfce4-systemload-plugin:amd64 1:1.3.2-2ubuntu4 amd64 system load monitor plugin for the Xfce4 panel
ii xfce4-taskmanager 1.5.8-1build1 amd64 process manager for the Xfce4 Desktop Environment
ii xfce4-terminal 1.1.5-1 amd64 Xfce terminal emulator
ii xfce4-verve-plugin:amd64 2.0.3-1build3 amd64 Verve (command line) plugin for Xfce panel
ii xfce4-weather-plugin:amd64 0.12.0-1build1 amd64 weather information plugin for the Xfce4 panel
ii xfce4-whiskermenu-plugin 2.10.1-1 amd64 Alternate menu plugin for the Xfce desktop environment
ii xfce4-xkb-plugin:amd64 1:0.8.5-1build1 amd64 xkb layout switch plugin for the Xfce4 panel
ii xfconf 4.20.0-1build1 amd64 utilities for managing settings in Xfce
ii xfdesktop4 4.20.1-1ubuntu2 amd64 Xfce desktop background, icons and root menu manager
ii xfdesktop4-data 4.20.1-1ubuntu2 all Xfce desktop background, icons and root menu (common files)
ii xfwm4 4.20.0-1build1 amd64 window manager of the Xfce project

```

### Driver Installation Details

Download deb files in https://github.com/intel/compute-runtime/releases/tag/26.31.39395.13.
sudo dpkg -i *.deb.

### Linux Distribution

Other (please specify below)

### Other Linux Distribution

Ubuntu 26.04

### Kernel Version & Boot Parameters

```
uname -r
7.0.0-30-generic

cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-7.0.0-30-generic root=UUID=19454695-456c-4aaf-ae90-ed26476bc394 ro quiet splash i915.force_probe=!56a0,!4682,!e223 xe.force_probe=56a0,4682,e223

lsmod | grep -E 'i915|xe'
xe 4419584 15
drm_gpusvm_helper 57344 1 xe
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
drm_display_helper 303104 1 xe
cec 106496 2 drm_display_helper,xe
i2c_algo_bit 16384 1 xe
intel_vsec 24576 3 intel_pmc_ssram_telemetry,pmt_telemetry,xe
video 77824 1 xe

```

### Actual Behavior

sycl::malloc_device() failed when allocate memory size is more than 19.4GB, through the "Max memory allocation" is 30.3GB (clinfo) on B70.
When allocate <=19.3GB, it's successful.

### Expected Behavior

sycl::malloc_device() should be successful when allocate memory size<= 30.3GB (Max memory allocation) on B70.
When allocate <=19.3GB, it's successful.

### Reproduction Rate

Always reproduces - 100%

### Steps to Reproduce

icpx -fsycl -o alloc_20gb alloc_20gb.cpp
./alloc_20gb 19.3
./alloc_20gb 19.4

alloc_20gb.cpp

```
#include
#include
#include
#include
#include
#include
#include
#include

uint64_t get_free_intel_gpu_memory(const sycl::queue &q)
{
const sycl::device dev = q.get_device();

if (!dev.has(sycl::aspect::ext_intel_free_memory))
{
return 0;
}

try
{
return dev.get_info();
}
catch (const sycl::exception &)
{
return 0;
}
}

uint64_t get_gpu_max_memory_allocation(const sycl::queue &q)
{
const sycl::device dev = q.get_device();

try
{
return static_cast(
dev.get_info());
}
catch (const sycl::exception &)
{
return 0;
}
}

int main(int argc, char *argv[])
{
try
{
float max_size_g = 19.0f;
if (argc > 1)
{
try
{
max_size_g = std::stof(argv[1]);
}
catch (const std::exception &)
{
max_size_g = 19.0f;
}
}

sycl::queue q(sycl::gpu_selector_v);

std::cout << "SYCL device: " << q.get_device().get_info() << "\n\n";
std::cout << "GPU max memory allocation: "
<< std::fixed << std::setprecision(2)
<< get_gpu_max_memory_allocation(q) / (1024.0 * 1024.0 * 1024.0)
<< " GiB\n\n";
const size_t one_gib = static_cast(max_size_g * 1024ULL * 1024ULL * 1024ULL);
std::vector allocations;

std::cout << "Starting allocations...\n\n";

for (int i = 1; i <= 1; ++i)
{
std::cout << "=== Allocation " << max_size_g << "(GiB) ===\n";

std::cout << "Free Intel GPU memory BEFORE: "
<< std::fixed << std::setprecision(2)
<< get_free_intel_gpu_memory(q) / (1024.0 * 1024.0) << " MiB\n";

void *dev_ptr = sycl::malloc_device(one_gib, q);

if (dev_ptr == nullptr)
{
std::cerr << "Failed to allocate " << max_size_g << " GiB on device!\n";
break;
}

allocations.push_back(dev_ptr);

std::cout << "Successfully allocated " << max_size_g << " GiB at: " << dev_ptr << "\n";
std::cout << "Free Intel GPU memory AFTER : "
<< std::fixed << std::setprecision(2)
<< get_free_intel_gpu_memory(q) / (1024.0 * 1024.0) << " MiB\n\n";
}

// Keep memory allocated until user presses a key or program ends
std::cout << "Memory will be released when the program ends.\n";

// Free all allocations at the end
std::cout << "Freeing all device memory...\n";
for (auto ptr : allocations)
{
sycl::free(ptr, q);
}

std::cout << "All device memory freed.\n";
}
catch (const sycl::exception &e)
{
std::cerr << "SYCL exception: " << e.what() << std::endl;
return 1;
}

return 0;
}

```

### Is this a regression?

- [ ] Yes, this is a regression - functionality that previously worked is now broken

### Last Known Working Driver Version

_No response_

### First Known Failing Driver Version

_No response_

### API Call Logs

19.3 GB - passed
```
./alloc_20gb 19.3
SYCL device: Intel(R) Arc(TM) Pro B70 Graphics

GPU max memory allocation: 30.30 GiB

Starting allocations...

=== Allocation 19.30(GiB) ===
Free Intel GPU memory BEFORE: 32586.04 MiB
Successfully allocated 19.30 GiB at: 0xffffd556b6400000
Free Intel GPU memory AFTER : 12822.70 MiB

Memory will be released when the program ends.
Freeing all device memory...
All device memory freed.
```

19.4GB - failed
```
./alloc_20gb 19.4
SYCL device: Intel(R) Arc(TM) Pro B70 Graphics

GPU max memory allocation: 30.30 GiB

Starting allocations...

=== Allocation 19.40(GiB) ===
Free Intel GPU memory BEFORE: 32586.04 MiB
Failed to allocate 19.4 GiB on device!
Memory will be released when the program ends.
Freeing all device memory...
All device memory freed.

```

### strace Logs

_No response_

### System Logs / dmesg Output

_No response_

### Backtrace (if crash or hang occurred)

_No response_

### Source Code / Reproducer

_No response_

### Command Line / Application Details

_No response_

### oneAPI Version (if applicable)

_No response_

### Screenshots / Video

_No response_

### Additional Notes

It's impact the llama.cpp SYCL backend. Refer to issue: https://github.com/ggml-org/llama.cpp/issues/28778

Start by reproducing the sycl::malloc_device() failure on the B70 using the listed driver version and allocation sizes, then inspect the runtime path handling the maximum allocation limit. Done means allocations above 19.3GB behave consistently with the reported 30.3GB maximum, with the result verified on the stated hardware.

Written by the indexing model from the issue text.