Regression 2026.0 - ovms stuck in initializing servable

[jpm-canonical]

Describe the bug
Likely a duplicate of #4059

OVMS v2026.0 gets stuck in Initializing Visual Language Model Legacy servable, using 100% on a single thread. SIGTERM (ctrl+c) is ignored, and one needs to send the SIGKILL signal to stop it.

OVMS v2025.4.1 does not have this issue.

To Reproduce
Steps to reproduce the behavior:

1. Download ovms_ubuntu24_python_on.tar.gz for release 2026.0. Extract.
2. OVMS launch command:

   #!/bin/bash
   
   # Add staged shared objects
   export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:./lib
   export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:./usr/lib/$ARCH_TRIPLET
   export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:./usr/local/lib
   #export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib
   
   # Add Python dependencies
   export PYTHONPATH=$PYTHONPATH:./lib/python # part of ovms package
   export PYTHONPATH=$PYTHONPATH:./lib/python3.12/site-packages
   
   exec bin/ovms --rest_port 8328 --rest_bind_address 127.0.0.1 \
   --source_model gemma-3-4b-it-ov-int4-fq \
   --model_repository_path /home/jpmeijers/models \
   --pipeline_type VLM --task text_generation \
   --cache_size 2 --log_level DEBUG --target_device GPU
   

3. See logs get stuck at
   [modelmanager][info][servable_initializer.cpp:448] Initializing Visual Language Model Legacy servable

Logs
TRACE enabled.

OVMS 2026.0 getting stuck: ovms-logs-2026.0.txt

OVMS 2025.4.1 working as expected: ovms-logs-2024.4.1.txt

Configuration

1. OVMS version - 2026.0 fails, 2025.4.1 works
2. OVMS config.json file - none
3. CPU, accelerator's versions if applicable:
   • Intel(R) Core(TM) i5-3570K CPU @ 3.40GHz
   • Intel Corporation DG2 [Arc A580] (rev 08)
4. Model repository directory structure

   $ tree models/
   models/
   └── gemma-3-4b-it-ov-int4-fq
       ├── added_tokens.json
       ├── chat_template.jinja
       ├── config.json
       ├── generation_config.json
       ├── graph.pbtxt
       ├── openvino_config.json
       ├── openvino_detokenizer.bin
       ├── openvino_detokenizer.xml
       ├── openvino_language_model.bin
       ├── openvino_language_model.xml
       ├── openvino_text_embeddings_model.bin
       ├── openvino_text_embeddings_model.xml
       ├── openvino_tokenizer.bin
       ├── openvino_tokenizer.xml
       ├── openvino_vision_embeddings_model.bin
       ├── openvino_vision_embeddings_model.xml
       ├── preprocessor_config.json
       ├── processor_config.json
       ├── README.md
       ├── special_tokens_map.json
       ├── tokenizer_config.json
       ├── tokenizer.json
       └── tokenizer.model
   
   2 directories, 23 files
   

5. Model or publicly available similar model that reproduces the issue:
   git clone --depth 1 https://huggingface.co/llmware/gemma-3-4b-it-ov-int4-fq
6. OS: Ubuntu Desktop 24.04.4