centos kernel 5.15.46 run error

[suselee]

Describe the bug

failed to attach tracepoint，group: syscalls name: sys_enter_accept4，err：reading file "/sys/kernel/debug/tracing/events/syscalls/...."

error is reported with each execution。

Screenshots

[dosubot]

Hello @suselee! I'm here to help you out with any bugs, questions, or contributions you may have. Let's tackle this issue together!

The error you're encountering with Kyanos on CentOS kernel 5.15.46, specifically the failure to attach the sys_enter_accept4 tracepoint, might be due to missing files in the /sys/kernel/debug/tracing/events/syscalls/ directory. Here are some steps you can take to troubleshoot and potentially resolve this issue:

1. Check Kernel Configuration: Ensure that your kernel is configured with the necessary options to support eBPF and tracepoints. You might need to enable options like CONFIG_BPF, CONFIG_BPF_SYSCALL, CONFIG_FTRACE, and CONFIG_KPROBE_EVENTS.

2. Verify Permissions: Make sure that the user running Kyanos has the necessary permissions to access the /sys/kernel/debug/tracing/events/syscalls/ directory. You might need to run Kyanos as a superuser or adjust the permissions accordingly.

3. Enable Debugging: Use Kyanos's debugging options to get more detailed logs. You can start Kyanos with the following options to enable detailed logging:

   --bpf-event-log-level 5 --conntrack-log-level 5 --protocol-log-level 5 --agent-log-level 5 --debug-output

   This will provide more insights into what might be going wrong during the tracepoint attachment process ^[1].

4. Check for Missing Files: If the files are indeed missing, it could be due to a kernel version mismatch or a missing kernel feature. Ensure that your kernel version is fully compatible with the version of Kyanos you are using.

These steps should help you diagnose and potentially fix the issue with attaching tracepoints in Kyanos.

To continue talking to Dosu, mention @dosu.

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[hengyoush]

Please execute cat /etc/os-release and provider the result.

[hengyoush]

Are you run with sudo？

[hengyoush]

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