debugging

I'm debuggin some pf issues, one of them is needing to perform a pfctl -Fr after boot up, otherwise all (sometimes some) rules in my anchor seem to have no effect (I have a blockall rule, then poking holes). For example, I am running a test Zabbix server on a VM, the hypervisor has Zabbix agent...

Hi! I am just interesting, how do you really make a kernel debugging in 2025? The documentation describes connection by serial cable, but most of current PC are shipped without COM ports. What is used? Special USB cable (USB-3 without some wires)? Or debug in a virtual machine - sounds...

Hello all! I have set up the following environment: vmrun.sh -d disk.img -t tap0 -G 1234 thevm Then I have moved to where I have the kernel compiled and ran gdb from there. In the VM, I have also run dtrace -n 'fbt:kernel:vtnet_tick:entry' And I can see that it fires regularly. The...

Hello, I am doing kernel development and would like to debug my version of the kernel. Can I do that with the help of debugger and bhyve, to run in a containerized environment? Thanks.

I'm trying to reach a point where I can do online debugging with kgdb of the FreeBSD kernel and it's modules in order to learn more about the system and take on a small projects in the system development. I have searched through the whole internet for the complete guide on how to do it however...

I have installed OpenDKIM, and using Sendmail. I am trying to make the outgoing email signed by OpenDKIM. I created the keys, added the txt record, from the OpenDKIM package I understood the search directory for opendkim.conf to be /usr/local/etc/mail/opendkim.conf . I have my selector as...

I recently set up a bhyve vm on my workstation for kernel development and figured others might be able to make use of my notes as well, because it's really quite easy. VM setup Download a FreeBSD disk image, i.e. 13.2-RELEASE if you're running 13.2. This version should match whatever kernel...

FreeBSD-12.3p5 GNU bash, version 5.1.16(0)-release (amd64-portbld-freebsd12.3) I am working on a bash script and I wish to trace the execution to locate a problem. The default shell for the development user is also bash. I am invoking the script from the command line using: export PS4="Line...

Hello! I use a java application with http service that after some time stops. The application is started at console (ssh) and when lost connection it becomes an orphaned process. This is not a problem. The problem is how can I view the cause that halts the process. (newbie, non-english-language)

Hello, I am currently using FreeBSD 14.0-CURRENT and I found a bug that triggers a kernel panic. I wanted to make a kernel crash dump to further investigate the issue, but after a few tries I still did not manage to do it. I started by following the instructions in the FreeBSD Handbook. I check...

I'm trying to debug a function from a kld and in order to do that I use gdb, the steps that i follow in order to do that are: 1. load the debugging symbols from /boot/kernel/kernel; 2. load debugging symbols from <my_file>.ko; 3. set a breakpoint on a function that should execute when the...

As of now I have installed the latest version of gdb via the package manager (7.9.1). The binary gets installed as /usr/local/bin/gdb which is apparently a symlink to /usr/local/bin/gdb791. The version which comes with the system is at /usr/bin/gdb which is an older version (v6.1.1). I have...

I am trying to hack/understand the nullfs kernel module so to that end, I do the following: On the target machine: kldstat gives: Id Refs Address Size Name 1 10 0xffffffff80200000 17e10c8 kernel 2 1 0xffffffff819e2000 4cf0 vmxnet.ko 3 1 0xffffffff819e7000 16e0...

Hello. I think the title says it all!! :) I would like to know if there is indeed a way to toggle between gdb and ddb while debugging a remote kernel. I am already at the gdb (or rather kgdb :rolleyes:) prompt. From here how do I switch to local ddb on the debugged machine?? My kernel...

Hello I am trying to add a virtual serial port (as a named pipe) on two FreeBSD 10 VMs in workstation. One end, I am keeping it as the server (the one VM which will actually be having the virtual serial port) and the other VM will connect to the other end. MY host is Windows 8.1. However when...