crash report explained?

[Tismofied]

Hey everyone. Hope you all having a great day!
Is there anyway to decipher the crash reports for non-tech savvy that might get in their instance of opnsense?
Can one post the report on chatgpt for example to know what the error is ?

Thank you!

[Monviech (Cedrik)]

If it's a kernel panic in the crash report, you can scroll to the very end where it says "Panic:" and copy that all into ChatGPT, though most of the time you don't get a straight answer. Thats because these crashes are very hard to trace. Here is an example that I tried with GPT4:

Code: [Select]

Fatal trap 9: general protection fault while in kernel mode
cpuid = 0; apic id = 00
instruction pointer = 0x20:0xffffffff80c84288
stack pointer         = 0x28:0xfffffe00cdeb4b40
frame pointer         = 0x28:0xfffffe00cdeb4be0
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current process = 56660 (python3.9)
trap number = 9
panic: general protection fault
cpuid = 7
time = 1709647142
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe00cdeb4960
vpanic() at vpanic+0x151/frame 0xfffffe00cdeb49b0
panic() at panic+0x43/frame 0xfffffe00cdeb4a10
trap_fatal() at trap_fatal+0x387/frame 0xfffffe00cdeb4a70
calltrap() at calltrap+0x8/frame 0xfffffe00cdeb4a70
--- trap 0x9, rip = 0xffffffff80c84288, rsp = 0xfffffe00cdeb4b40, rbp = 0xfffffe00cdeb4be0 ---
__rw_wlock_hard() at __rw_wlock_hard+0x158/frame 0xfffffe00cdeb4be0
pmap_try_insert_pv_entry() at pmap_try_insert_pv_entry+0x109/frame 0xfffffe00cdeb4c20
pmap_copy() at pmap_copy+0x570/frame 0xfffffe00cdeb4cc0
vmspace_fork() at vmspace_fork+0xca0/frame 0xfffffe00cdeb4d40
fork1() at fork1+0x428/frame 0xfffffe00cdeb4da0
sys_fork() at sys_fork+0x54/frame 0xfffffe00cdeb4e00
amd64_syscall() at amd64_syscall+0x10c/frame 0xfffffe00cdeb4f30
fast_syscall_common() at fast_syscall_common+0xf8/frame 0xfffffe00cdeb4f30
--- syscall (0, FreeBSD ELF64, syscall), rip = 0x825f35dca, rsp = 0x820fc02f8, rbp = 0x820fc0350 ---
KDB: enter: panic
panic.txt0600003014571622446  7144 ustarrootwheelgeneral protection faultversion.txt0600007414571622446  7547 ustarrootwheelFreeBSD 13.2-RELEASE-p7 stable/23.7-n254871-d5ec322cffc SMP
ChatGPT:

Code: [Select]

A "general protection fault" in a FreeBSD system (as indicated by Fatal trap 9) is a type of error that occurs when the CPU detects a violation of protection rules. This fault can happen for various reasons, including but not limited to accessing memory that the current code segment is not permitted to access, executing privileged instructions without the necessary privileges, or writing to read-only memory. Here's a breakdown of the provided kernel panic message:
Core Information

    Trap Number = 9: This indicates a general protection fault. Unlike other traps, such as page faults, general protection faults are less specific about the cause and can result from a range of protection violations.
    Current Process = 56660 (python3.9): This shows that the process running at the time of the fault was Python version 3.9, with a process ID of 56660. While this doesn't necessarily mean Python caused the fault, it was the active context.
    Instruction Pointer (RIP) = 0xffffffff80c84288: The address in the kernel code where the fault occurred. This address is within the kernel's address space, suggesting the fault happened during a system call or other kernel operation.
    Processor EFLAGS: Indicates the state of various CPU flags at the time of the fault. Flags such as "interrupt enabled" and "IOPL = 0" (I/O Privilege Level) provide context about the processor's state.

Stack Trace Analysis

The stack backtrace provides insight into what the kernel was doing when the fault occurred:

    Functions like __rw_wlock_hard, pmap_try_insert_pv_entry, and pmap_copy hint at operations related to kernel synchronization primitives (like read-write locks) and virtual memory management (manipulating page tables and process virtual address spaces).
    vmspace_fork() and fork1() suggest that the fault occurred during a process fork operation, possibly while the kernel was trying to copy or modify the virtual memory space for creating a new process.

Potential Causes and Solutions

    Kernel Bug: The fault could be due to a bug within the FreeBSD kernel, especially in the components that handle process forking and virtual memory management. Reviewing the FreeBSD errata and update logs for fixes related to similar issues might provide a solution.
    Hardware Issue: Faulty hardware, especially memory, can lead to unpredictable kernel faults. Running hardware diagnostics could help identify and rectify such issues.
    Software Issue: Although the Python process is mentioned, it's more likely the fault was triggered by what this process was doing at the time (e.g., forking a new process). Reviewing the Python code for unusual fork or memory manipulation patterns might help, especially if this panic is reproducible with specific Python scripts.

Next Steps

    Update and Patch: Ensure the system is running the latest version of FreeBSD and all patches have been applied. This fault may have been addressed in a more recent release or patch.
    Hardware Test: Conduct memory tests and check the system's hardware for faults.
    Consult Logs and Forums: Look for similar issues reported by other FreeBSD users. Solutions or workarounds may already exist.
    Debugging: If the issue persists and you have the expertise, use debugging tools to analyze the kernel state and memory at the time of the fault. This approach requires deep knowledge of FreeBSD kernel internals.

General protection faults can be challenging to diagnose due to their broad range of potential causes. Systematic troubleshooting, starting with the most common and easily checked issues, is the best approach.
It's pretty much Voodoo for the Bot and it tries to invent things.