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[BUG] pyservicemaker: a Python exception in a probe operator aborts the process

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#100 コメント 1 件 リアクション 0 件 担当者 0 名 GitHub で見る

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評価

難易度
4/5
見積もり時間
3〜5日
初心者へのやさしさ
48/100
issue の種類
バグ
明瞭さ
おおむね明確
活発さ
活発
技術スタック
cpp, docker, python
領域
api, backend

調査の方向性

Start with src/service-maker/sources/python/src/bindings/probe.h and src/service-maker/sources/core/src/buffer_probe.cpp, where the issue identifies the uncaught exception path. Reproduce with the provided repro.py in the DeepStream container for both metadata and buffer probes. Done when a probe exception no longer aborts the process and its behavior matches the intended error handling, such as traceback reporting or a pipeline error.

索引モデルが issue の本文から書いたものです。

説明

bug

Describe the bug

When handle_buffer of a BufferOperator or handle_metadata of a BatchMetadataOperator raises a Python exception, pyservicemaker aborts the whole process with std::terminate (SIGABRT, exit code 134). One bug in application code takes the service down, the pipeline gets no chance to stop or finalize its sinks, and the application cannot catch or log the error itself.

The trampolines in src/service-maker/sources/python/src/bindings/probe.h call the Python method through PYBIND11_OVERRIDE_PURE_NAME, which turns the Python exception into a C++ pybind11::error_already_set. Nothing catches it on the way back: neither the trampoline nor genric_probe_callback in buffer_probe.cpp. The exception then reaches the GStreamer streaming thread, and the C++ runtime calls std::terminate.

Steps/Code to reproduce bug

Save as repro.py:

import sys

from pyservicemaker import BatchMetadataOperator, BufferOperator, Pipeline, Probe


class MetaFail(BatchMetadataOperator):
    def __init__(self):
        super().__init__()
        self.batches = 0

    def handle_metadata(self, batch_meta):
        self.batches += 1
        if self.batches == 10:
            raise ValueError("bug in the probe")


class BufFail(BufferOperator):
    def __init__(self):
        super().__init__()
        self.batches = 0

    def handle_buffer(self, buffer):
        self.batches += 1
        if self.batches == 10:
            raise ValueError("bug in the probe")
        return True


probe = MetaFail() if sys.argv[1] == "meta" else BufFail()
pipeline = Pipeline("raise")
pipeline.add("videotestsrc", "src", {"num-buffers": 100})
pipeline.add("nvvideoconvert", "conv", {})
pipeline.add("nvstreammux", "mux", {"batch-size": 1, "width": 640, "height": 480, "batched-push-timeout": 40000})
pipeline.add("fakesink", "sink", {"sync": False})
pipeline.link("src", "conv")
pipeline.link(("conv", "mux"), ("", "sink_0"))
pipeline.link("mux", "sink")
pipeline.attach("mux", Probe("fail", probe))
pipeline.start()
pipeline.wait()
print("wait() returned")

Run it in the stock container (pyyaml is installed first because import pyservicemaker needs it, see #98):

docker run --rm --gpus all -v "$PWD":/repro --entrypoint bash nvcr.io/nvidia/deepstream:9.1-triton-multiarch \
  -c "pip install -q --break-system-packages pyyaml && python3 /repro/repro.py meta; echo exit code \$?"

Both meta and buf print this when the probe raises on the tenth batch:

terminate called after throwing an instance of 'pybind11::error_already_set'
  what():  ValueError: bug in the probe

At:
  /repro/repro.py(14): handle_metadata

bash: line 1:    80 Aborted                 (core dumped) python3 /repro/repro.py meta
exit code 134

nvcr.io/nvidia/deepstream:9.0-triton-multiarch behaves the same with a BufferOperator on videotestsrc ! fakesink.

Expected behavior

The exception stays inside the probe. The binding catches error_already_set in the trampoline, prints the Python traceback (as Python does for an exception in a thread), and passes the buffer on. A BufferOperator that raises could drop the buffer, as one that returns False does. If a failing probe should end the pipeline, the binding could post an error message on the bus (GST_ELEMENT_ERROR), so that the application sees it in on_message once #98 is fixed.

Environment details

  • Environment location: Docker on bare-metal (Ubuntu 26.04.1 LTS host, RTX A4000 Laptop GPU, driver 595.99.02)
  • Method of DeepStream install: Docker, nvcr.io/nvidia/deepstream:9.1-triton-multiarch (digest sha256:fd31f5b44ababdbdee8cd397a375e888191b49e402ac237254a4cdc239130f5b), DeepStream 9.1.0, pyservicemaker 0.0.1, TensorRT 10.16.0.72, CUDA 13.2
  • Docker command: see the steps above
  • scripts/print_env.sh output, run inside the same container:
Click here to see environment details
 **git***
 Not inside a git repository
 
 ***OS Information***
 DISTRIB_ID=Ubuntu
 DISTRIB_RELEASE=24.04
 DISTRIB_CODENAME=noble
 DISTRIB_DESCRIPTION="Ubuntu 24.04.4 LTS"
 PRETTY_NAME="Ubuntu 24.04.4 LTS"
 NAME="Ubuntu"
 VERSION_ID="24.04"
 VERSION="24.04.4 LTS (Noble Numbat)"
 VERSION_CODENAME=noble
 ID=ubuntu
 ID_LIKE=debian
 HOME_URL="https://www.ubuntu.com/"
 SUPPORT_URL="https://help.ubuntu.com/"
 BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
 PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
 UBUNTU_CODENAME=noble
 LOGO=ubuntu-logo
 Linux b5ade298bb5a 7.0.0-38-generic #38-Ubuntu SMP PREEMPT_DYNAMIC Fri Sep  4 09:10:14 UTC 2026 x86_64 x86_64 x86_64 GNU/Linux
 
 ***GPU Information***
 Thu Oct 22 14:52:51 2026
 +-----------------------------------------------------------------------------------------+
 | NVIDIA-SMI 595.99.02              Driver Version: 595.99.02      CUDA Version: 13.2     |
 +-----------------------------------------+------------------------+----------------------+
 | GPU  Name                 Persistence-M | Bus-Id          Disp.A | Volatile Uncorr. ECC |
 | Fan  Temp   Perf          Pwr:Usage/Cap |           Memory-Usage | GPU-Util  Compute M. |
 |                                         |                        |               MIG M. |
 |=========================================+========================+======================|
 |   0  NVIDIA RTX A4000 Laptop GPU    Off |   00000000:01:00.0 Off |                  N/A |
 | N/A   63C    P0             25W /   80W |     161MiB /   8192MiB |      0%      Default |
 |                                         |                        |                  N/A |
 +-----------------------------------------+------------------------+----------------------+
 
 +-----------------------------------------------------------------------------------------+
 | Processes:                                                                              |
 |  GPU   GI   CI              PID   Type   Process name                        GPU Memory |
 |        ID   ID                                                               Usage      |
 |=========================================================================================|
 |  No running processes found                                                             |
 +-----------------------------------------------------------------------------------------+
 
 ***CPU***
 Architecture:                            x86_64
 CPU op-mode(s):                          32-bit, 64-bit
 Address sizes:                           39 bits physical, 48 bits virtual
 Byte Order:                              Little Endian
 CPU(s):                                  16
 On-line CPU(s) list:                     0-15
 Vendor ID:                               GenuineIntel
 Model name:                              11th Gen Intel(R) Core(TM) i9-11950H @ 2.60GHz
 CPU family:                              6
 Model:                                   141
 Thread(s) per core:                      2
 Core(s) per socket:                      8
 Socket(s):                               1
 Stepping:                                1
 CPU(s) scaling MHz:                      42%
 CPU max MHz:                             5000.0000
 CPU min MHz:                             800.0000
 BogoMIPS:                                5222.40
 Flags:                                   fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf tsc_known_freq pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault epb cat_l2 cdp_l2 ssbd ibrs ibpb stibp ibrs_enhanced tpr_shadow flexpriority ept vpid ept_ad fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid rdt_a avx512f avx512dq rdseed adx smap avx512ifma clflushopt clwb intel_pt avx512cd sha_ni avx512bw avx512vl xsaveopt xsavec xgetbv1 xsaves split_lock_detect user_shstk dtherm ida arat pln pts hwp hwp_notify hwp_act_window hwp_epp hwp_pkg_req vnmi avx512vbmi umip pku ospke avx512_vbmi2 gfni vaes vpclmulqdq avx512_vnni avx512_bitalg avx512_vpopcntdq rdpid movdiri movdir64b fsrm avx512_vp2intersect md_clear ibt flush_l1d arch_capabilities
 Virtualization:                          VT-x
 L1d cache:                               384 KiB (8 instances)
 L1i cache:                               256 KiB (8 instances)
 L2 cache:                                10 MiB (8 instances)
 L3 cache:                                24 MiB (1 instance)
 NUMA node(s):                            1
 NUMA node0 CPU(s):                       0-15
 Vulnerability Gather data sampling:      Vulnerable
 Vulnerability Ghostwrite:                Not affected
 Vulnerability Indirect target selection: Mitigation; Aligned branch/return thunks
 Vulnerability Itlb multihit:             Not affected
 Vulnerability L1tf:                      Not affected
 Vulnerability Mds:                       Not affected
 Vulnerability Meltdown:                  Not affected
 Vulnerability Mmio stale data:           Not affected
 Vulnerability Old microcode:             Not affected
 Vulnerability Reg file data sampling:    Not affected
 Vulnerability Retbleed:                  Not affected
 Vulnerability Spec rstack overflow:      Not affected
 Vulnerability Spec store bypass:         Mitigation; Speculative Store Bypass disabled via prctl
 Vulnerability Spectre v1:                Mitigation; usercopy/swapgs barriers and __user pointer sanitization
 Vulnerability Spectre v2:                Mitigation; Enhanced / Automatic IBRS; IBPB conditional; PBRSB-eIBRS SW sequence; BHI SW loop, KVM SW loop
 Vulnerability Srbds:                     Not affected
 Vulnerability Tsa:                       Not affected
 Vulnerability Tsx async abort:           Not affected
 Vulnerability Vmscape:                   Not affected
 
 ***CMake***
 /usr/bin/cmake
 cmake version 3.28.3
 
 CMake suite maintained and supported by Kitware (kitware.com/cmake).
 
 ***g++***
 /usr/bin/g++
 g++ (Ubuntu 13.3.0-6ubuntu2~24.04.1) 13.3.0
 Copyright (C) 2023 Free Software Foundation, Inc.
 This is free software; see the source for copying conditions.  There is NO
 warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 
 
 ***nvcc***
 /usr/local/cuda/bin/nvcc
 nvcc: NVIDIA (R) Cuda compiler driver
 Copyright (c) 2005-2026 NVIDIA Corporation
 Built on Mon_Mar_02_09:52:23_PM_PST_2026
 Cuda compilation tools, release 13.2, V13.2.51
 Build cuda_13.2.r13.2/compiler.37434383_0
 
 ***Python***
 
 ***Environment Variables***
 PATH                            : /opt/proto/bin:/opt/tritonserver/bin:/usr/local/nvidia/bin:/usr/local/cuda/bin:/usr/local/mpi/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/local/ucx/bin:/opt/amazon/efa/bin:/.local/bin
 LD_LIBRARY_PATH                 : /opt/tritonserver/lib:/opt/tritonclient/lib:/usr/src/tensorrt/lib:/opt/riva/lib:/usr/local/cuda-13/lib64:/usr/lib/x86_64-linux-gnu:/opt/hpcx/ucc/lib/:/opt/hpcx/ucx/lib/:/usr/local/cuda/compat/lib:/usr/local/nvidia/lib:/usr/local/nvidia/lib64:/.local/lib
 NUMBAPRO_NVVM                   :
 NUMBAPRO_LIBDEVICE              :
 CONDA_PREFIX                    :
 PYTHON_PATH                     :
 
 conda not found
 ***pip packages***
 /usr/bin/pip
 Package             Version
 ------------------- ---------------
 annotated-doc       0.0.4
 annotated-types     0.7.0
 anyio               4.12.1
 apparmor            4.0.1
 certifi             2026.2.25
 cupy-cuda13x        13.6.0
 distlib             0.4.0
 distro              1.9.0
 fastapi             0.138.1
 fastrlock           0.8.3
 filelock            3.25.2
 h11                 0.16.0
 httpcore            1.0.9
 httpx               0.27.2
 idna                3.11
 iniconfig           2.3.0
 jaraco.context      6.1.0
 jiter               0.13.0
 LibAppArmor         4.0.1
 numpy               1.26.4
 openai              1.107.3
 packaging           24.0
 partial-json-parser 0.2.1.1.post7
 pip                 24.0
 platformdirs        4.9.4
 pluggy              1.6.0
 pydantic            2.10.6
 pydantic_core       2.27.2
 Pygments            2.19.2
 pyservicemaker      0.0.1
 pytest              9.0.2
 python-apt          2.7.7+ubuntu5.2
 python-discovery    1.1.3
 scipy               1.16.3
 setuptools          78.1.1
 sniffio             1.3.1
 starlette           0.52.1
 tqdm                4.67.3
 tritonfrontend      2.67.0
 tritonserver        0.0.0
 typing_extensions   4.15.0
 typing-inspection   0.4.2
 virtualenv          21.2.0
 wheel               0.42.0

Additional context

Today every Python operator has to wrap its whole body in try/except Exception and return normally, or the process dies.

主要言語
C++
スター
283
フォーク
62
平均マージ
2時間 24分
マージ済み PR（30日）
20

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