What did I do

I connected to a broker using MQTTX and subscribed to a topic that receives a high volume of messages.

What happened

My entire computer completely froze and became totally unresponsive. The system locked up so hard that I lost all access to keyboard, mouse, UI, everything. The only possible action was to force a full reboot.
This is 100% reproducible and only happens when using MQTTX.

Expected

MQTTX should never cause a full system freeze under any circumstances.
A software client must have proper safeguards, rate-limiting, buffering, or at the very least crash itself not the entire operating system. It is absolutely unacceptable that a simple electron app can lead to a total system lock-up.

Environment

• OS: Windows 11 (latest patches applied)

• MQTTX version: v1.12.0

• Hardware:

  • Intel Core Ultra 7 165H
  • 32 GB RAM
  • NVIDIA RTX 2000 Ada Generation Laptop GPU

More detail

There is nothing particularly useful in the logs before the freeze, except for the following entries:

[2025-11-13 10:48:25] [ERROR] Error subscribing to topic: Error: client disconnecting
[2025-11-13 10:48:25] [INFO] Message buffer mode enabled (> 30/s)
[2025-11-13 10:48:25] [INFO] Message buffer mode enabled (> 30/s)
[2025-11-13 10:48:25] [INFO] Message buffer mode enabled (> 30/s)
[2025-11-13 10:48:25] [INFO] Message buffer mode enabled (> 30/s)
[2025-11-13 10:48:25] [INFO] Message buffer mode enabled (> 30/s)
[2025-11-13 10:48:25] [INFO] Message buffer mode enabled (> 30/s)
[2025-11-13 10:48:25] [INFO] Message buffer mode enabled (> 30/s)
[2025-11-13 10:48:25] [INFO] Message buffer mode enabled (> 30/s)
[2025-11-13 10:48:25] [INFO] Message buffer mode enabled (> 30/s)

No desktop application should ever be capable of freezing an entire operating system. The lack of control, safety mechanisms, or even basic stability is disappointing.