Hello, when we do the whole machine test, after umount uninstalls the U disk,the probability triggers the CPU TIMEOUT when pulling out the U disk,and then there is a crash.In the past,we could see from the exception log that it was a module exception,but this time we can’t see which module caused it.Can you help us analyze it in detail?
Test environment:
1.jetpack 5.1.2
2.Kernel RT kernel turned on
3.We implemented automatic disk mounting based on
4.We connected two USB disks and two portable hard
The test steps are as follows:
1.Unmount each of the four mounted devices in turn.
2.Pull out 4 devices in sequence.
3.Cycle through steps 1-2 to trigger the issue for the fifth time.
We will submit the exception screenshots and log files later
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To analyze the issue you’re experiencing with the Jetson AGX Orin, where the system crashes with a CPU timeout after unmounting and pulling out a U disk during a whole machine test, let’s break down the key points and compare them with similar issues and configurations mentioned in the context.
Jetpack Version: You’re using Jetpack 5.1.2. This version has been mentioned in the context with a specific issue related to building the Linux kernel when CONFIG_DEBUG_INFO_BTF=y. However, this doesn’t directly relate to your issue but indicates potential kernel-related challenges with this version.
Kernel RT (Real-Time) Enabled: The use of a real-time kernel can introduce specific behaviors and constraints, especially regarding timing and interrupt handling. This could potentially exacerbate issues related to device removal and system stability. There are discussions in the context about real-time kernel patches on different Jetson models, which might imply that RT kernel configurations can sometimes lead to unique stability or performance issues.
Automatic Disk Mounting: Implementing automatic disk mounting could introduce additional complexity when dealing with device removal. The system’s ability to handle devices being pulled out while mounted could be affected by how the automatic mounting is implemented, potentially leading to crashes or timeouts if not properly synchronized with the system’s expectations.
Multiple Devices Connected: The fact that you have connected two USB disks and two portable hard drives and are systematically unmounting and pulling out these devices could indicate an issue related to how the system handles multiple device removals in sequence. This stress testing could reveal issues in the system’s ability to gracefully handle device removal, possibly due to timing issues, interrupt handling, or resource management.
Comparison with Similar Issues:
Call Trace Observed in During Boot in Preempt-RT Kernel: This issue on the Jetson AGX Orin involves kernel crashes during boot with the preempt-RT kernel enabled. While your issue occurs during device removal rather than boot, the involvement of the RT kernel in both cases might suggest a common underlying theme related to timing and interrupt handling.
AGX Orin GPIO Issue: Although not directly related to device removal, this issue highlights kernel-level problems on the Jetson AGX Orin, suggesting that the platform might be prone to specific kernel-related challenges.
Boot Failed Jetson Xavier NX Boot: While this issue is about boot failure, it indicates that NVIDIA Jetson devices can experience critical failures under certain conditions, possibly related to hardware, kernel, or firmware interactions.
Analysis and Recommendations:
Review System Logs: Carefully examine system logs and exception logs to identify any patterns or clues that might indicate which module or system component is failing when the crash occurs.
Test with Different Configurations: Try reproducing the issue with a single device, or with the RT kernel disabled, to isolate whether the problem is related to the specific kernel configuration or the number of devices.
Inspect Automatic Mounting Scripts: Ensure that the automatic disk mounting/unmounting scripts are properly handling device removal and are synchronized with the system’s expectations to avoid race conditions or unexpected device state changes.
Consult NVIDIA Documentation and Forums: Given the specificity of the issue and the platform, consulting official NVIDIA documentation, forums, or support channels might provide insights or known issues related to the Jetson AGX Orin and RT kernel configurations.
In conclusion, while the exact cause of the crash is not immediately clear from the provided information, it likely relates to a combination of factors including the RT kernel, automatic disk mounting, and the handling of multiple device removals. A systematic approach to isolating these factors and consulting relevant documentation and support resources will be crucial in resolving the issue.
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