"ze_peak" freezes on DG1 with latest drm-tip kernel + drivers

Setup:

• HW: CML-S / DG1 (0x4905)
• OS: Ubuntu 22.04
• Kernel: "drm-tip" head from yesterday
• UMD: Latest releases of compute stack components, built with LLVM 12
• App: "ze_peak" from level-zero-tests head

Bug:

./ze_peak freezes with 99% CPU usage after showing:
Single Precision Compute (GFLOPS)

(I.e. half precision and global BW tests before it worked fine.)

It can be quit with ^C, so it's not in 100% CPU loop.

Gdb shows:

warning: Target and debugger are in different PID namespaces; thread lists and other data are likely unreliable.  Connect to gdbserver inside the container.
0x00007f6fbca28cab in sched_yield () from target:/lib/x86_64-linux-gnu/libc.so.6
(gdb) bt
#0  0x00007f6fbca28cab in sched_yield () from target:/lib/x86_64-linux-gnu/libc.so.6
#1  0x00007f6fbc27cd63 in ?? () from target:/usr/local/lib/libze_intel_gpu.so.1
#2  0x00007f6fbc0572c2 in ?? () from target:/usr/local/lib/libze_intel_gpu.so.1
#3  0x0000564de2c87d3f in ?? ()
#4  0x0000564de2c88653 in ?? ()
#5  0x0000564de2c94ba1 in ?? ()
#6  0x0000564de2c86104 in ?? ()
#7  0x00007f6fbc949d90 in ?? () from target:/lib/x86_64-linux-gnu/libc.so.6
#8  0x00007f6fbc949e40 in __libc_start_main () from target:/lib/x86_64-linux-gnu/libc.so.6
#9  0x0000564de2c862e5 in ?? ()

perf showed most of the time being spent inside libze_intel_gpu.so.1. I.e. it could be driver issue, but I thought it better to start from the app.

ze_image_copy, ze_nano and ze_pingpong work fine. ze_bandwidth gets slower and slower, and I did not wait for it to complete.

Start by reproducing the freeze with ze_peak on the stated CML-S/DG1 setup and the listed drm-tip and compute-stack versions. Compare its behavior with ze_image_copy, ze_nano, ze_pingpong, and ze_bandwidth, then use the provided gdb and perf observations to determine whether the issue is in the test or libze_intel_gpu.so.1. Done means the cause is isolated and a regression test or fix is identified.