Bun Crash On Linux: Troubleshooting & Fixes

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Bun Crash on Linux: Troubleshooting & Fixes

Hey guys! So, we've got a serious issue on our hands: Bun, the fast JavaScript runtime, is crashing on Linux. Specifically, we're seeing a segmentation fault when trying to run monorepo-hash-bun (which seems to be a tool for managing monorepos, like those used for big projects). This is a bummer because Bun is designed to be super speedy, and this kind of crash can really slow things down. Let's dive deep into this bug, understand the problem, and maybe even find a fix.

The Bug: A Deep Dive into the Crash

The core of the problem, as described in the issue, is a segmentation fault. This means the program is trying to access a part of the computer's memory that it's not allowed to, leading to the crash. The error message, "panic(main thread): Segmentation fault at address 0x53E06000000", is pretty scary, but it gives us some crucial clues. The crash occurred when running pnpm monorepo-hash-bun --help. This is a critical indicator of when the crash happens.

Looking at the provided stack trace, we can see where Bun is failing. The trace points to WebKit's JavaScriptCore (JSC), which Bun uses to execute JavaScript code. The error occurs in CachedTypes.cpp, ProgramExecutable.cpp, and other related files within the JSC engine. This suggests the issue is likely within Bun's JavaScript execution engine, specifically around how it handles and caches code blocks or during module loading. The stack trace is a map of where the program was when it crashed. It goes down the line, and we can read it to identify the functions and modules involved. The crash happened during evaluateProgram and evaluateCommonJSModuleOnce. The error occurred when running the help command, which can be seen by the command line option --help. The issue also has links to the source code, which can be useful when debugging.

Reproducing the Crash: Can You Make it Happen?

Unfortunately, the report doesn't offer specific steps to reproduce the crash. It simply states "No response" for the "Steps to reproduce" section. Without clear steps, it's tough to figure out if it's a general problem or something specific to the user's environment or setup. If you're experiencing this issue, the best thing to do is to try and reproduce the error. Try running the exact command (pnpm monorepo-hash-bun --help) and see if it crashes for you too. If it does, then at least we know it's easily reproducible! If you can identify any specific conditions (like the type of project, the version of monorepo-hash, or any special environment variables), be sure to note them. This information will be invaluable for the Bun team when they try to fix the bug. If you have the same issue, I encourage you to reproduce the crash and give it a try.

What's Supposed to Happen: The Expected Behavior

Again, the report says "No response" for the "Expected behavior" section. Ideally, running the help command should display the help information without any crashes. We'd expect monorepo-hash-bun --help to show us a list of commands, options, and how to use the tool. We also want to know the command to give us the information about monorepo-hash, and it should not crash. A good program will always provide information about how to use it, and not crash.

Screenshots and Additional Context: More Clues

There are no screenshots provided, which isn't a huge deal, but they can be helpful sometimes. More importantly, we have a detailed stack trace. This is a map of the program's execution at the time of the crash. As we mentioned earlier, the stack trace points to several files within WebKit's JavaScriptCore (JSC). It also gives us the versions of Bun and the Linux kernel, along with the CPU information. This kind of detail is essential for the developers to understand where the error came from. The stack trace contains the following information: the version, CPU, and other runtime information. This information is a lifesaver for developers.

Potential Causes and Workarounds: Can We Fix This?

Without being able to reproduce the error or having a root cause, it's hard to be certain of the exact problem. However, given the nature of the crash (segmentation fault) and the stack trace, here are a few potential causes and possible workarounds:

  • Memory Corruption: There might be a bug in how Bun manages memory, leading to data corruption and the crash. The stack trace contains the code block responsible for the crash. This is a common problem in low-level programming. Workaround: Try updating Bun to the latest version. The developers may have fixed the issue. Also, make sure your system has enough RAM.
  • JavaScriptCore Issue: The problem could be within the JavaScriptCore engine itself. It could be an issue with how it handles specific JavaScript code or how it interacts with the system. Workaround: Try to update to the latest Bun version, which might include an updated JSC version. Also, it might be an isolated issue specific to the tool monorepo-hash. Try running other commands and see if it crashes.
  • Compiler/System Interaction: There may be an incompatibility between the Bun compiler and the specific Linux distribution or kernel version. Workaround: Try a different version of Bun, or update your Linux system. Check that all the required libraries for Bun are installed. A system update might solve the issue.
  • Specific Code in monorepo-hash: Perhaps the monorepo-hash tool has some JavaScript code that triggers a bug in Bun. Workaround: Contact the maintainers of the monorepo-hash tool. They might have a patch that fixes the error.

Reporting the Bug: Help the Bun Team

If you encounter this crash, the most important thing is to report it to the Bun team. The report provides a link to where you can file a GitHub issue. When you report the bug, include:

  • A clear description of the problem.
  • The exact command that caused the crash (pnpm monorepo-hash-bun --help).
  • The output of the crash, including the stack trace. The stack trace is super important. Please make sure that you include it.
  • Your operating system and kernel version.
  • Your Bun version.
  • Any additional context that might be helpful (e.g., the monorepo-hash version, how you installed Bun, any unusual environment variables, etc.).

The more information you can provide, the easier it will be for the Bun developers to fix the bug.

Conclusion: Stay Calm and Debug On!

This crash is annoying, but it's important to remember that this is a bug in Bun, not necessarily your code. By providing detailed reports and helping the Bun team, we can fix this bug and make Bun more stable and reliable. Keep calm, gather information, report it, and help make the software better!