[Bug]: GPU Hang on decoding stream

[akhilxavi]

Which component impacted?

Decode

Is it regression? Good in old configuration?

None

What happened?

In my Alder Lake N platform running Ubuntu Noble with 6.8.0.35-generic kernel the GPU Hang on HEVC decode of the rtsp stream.
My vainfo is

libva info: VA-API version 1.22.0
libva info: User environment variable requested driver 'iHD'
libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/iHD_drv_video.so
libva info: Found init function __vaDriverInit_1_22
libva info: va_openDriver() returns 0
vainfo: VA-API version: 1.22 (libva 2.22.0.pre1)
vainfo: Driver version: Intel iHD driver for Intel(R) Gen Graphics - 24.2.3 (90a02f6)

Stream decode command:
ffmpeg -hide_banner -c:v hevc_qsv -probesize 32 -analyzeduration 0 -fflags nobuffer -fflags discardcorrupt -avioflags direct -flags low_delay -async_depth 1 -r 60 -load_plugin hevc_hw -i rtsp://localhost:8554/live.stream -f null -

encode command:
ffmpeg -hide_banner -pixel_format nv12 -video_size 3840x2160 -r 60 -stream_loop 10000 -i single-frame-nv12-4k.yuv -an -c:v hevc_qsv -async_depth 1 -profile:v main -tier 0 -int_ref_type horizontal -int_ref_cycle_size 6 -int_ref_qp_delta 0 -int_ref_cycle_dist 120 -bf 0 -low_power 1 -skip_frame 2 -low_delay_brc 1 -preset veryfast -b:v 200M -g 120 -slices 12 -f rtsp -rtsp_transport tcp rtsp://localhost:8554/live.stream

If I use same decode command for decoding a local file, I am not seeing the issue:

Local file decode:
ffmpeg -hide_banner -c:v hevc_qsv -probesize 32 -analyzeduration 0 -fflags nobuffer -fflags discardcorrupt -avioflags direct -flags low_delay -async_depth 1 -r 60 -load_plugin hevc_hw -i nv12-5000.h265 -f null -

gpu-hang.txt

If I set the GOP to a higher value the hang takes some time to happen.

What's the usage scenario when you are seeing the problem?

Transcode for media delivery

What impacted?

No response

Debug Information

1. What's libva/libva-utils/gmmlib/media-driver version?
   VA-API version 1.22.0
   libva 2.22.0.pre1
   Intel iHD driver for Intel(R) Gen Graphics - 24.2.3
   intel-gmmlib-22.3.19

2. Could you confirm whether GPU hardware exist or not by ls /dev/dri?
   ls /dev/dri/
   by-path card0 renderD128

3. Could you provide the GPU hardware infromation by lspci -nn |grep -Ei 'VGA|DISPLAY'?
   00:02.0 VGA compatible controller [0300]: Intel Corporation Alder Lake-N [UHD Graphics] [8086:46d1]

4, 5, 6
gpu-hang.txt
hang-dmesg.txt
hang-vainfo.txt

No libva trace logs printed
"vpl-inspect" is working

Do you want to contribute a patch to fix the issue?

None

[akhilxavi]

I am able to reproduce the issue with below version also.
Driver version: Intel iHD driver for Intel(R) Gen Graphics - 24.1.5 (8068c2e)

libvatrace:
libva_trace.zip

vpl-inspect:
hang-vpl.txt

[akhilxavi]

Further Update: mediamtx is used as the RTSP server. while using TCP as the transport protocol, the Hang is not happening. The Hang happens only when UDP used as transport protocol.

[Jexu]

Pls get the i915_error_state log under /sys/class/drm/card0/error after hang happen