After Automatic Update To 42 Serial-getty@ttyS0.service Fails To Start

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After Automatic Update to Fedora 42: Serial-Getty@TtyS0.Service Fails to Start

In this article, we will explore the issue of the serial-getty@ttyS0.service failing to start after an automatic update to Fedora 42. This problem can be frustrating, especially when reprovisioning a VM from scratch leads to the same issue. We will delve into the details of the problem, analyze the error messages, and provide a step-by-step solution to resolve the issue.

The serial-getty@ttyS0.service is responsible for managing the serial console on a system. It allows users to access the system's console over a serial connection. However, after an automatic update to Fedora 42, this service fails to start, resulting in an error message.

The error message provided by journalctl -xeu serial-getty@ttyS0.service indicates that the process 46768 (agetty) of user 0 dumped core. This suggests that the agetty process crashed, resulting in a core dump. The core dump is a file that contains the memory image of the process at the time of the crash.

The stack trace of thread 46768 provides valuable information about the crash. It shows the following functions:

  • __strncmp_avx2 (libc.so.6 + 0x14b601): This function is a part of the libc library and is responsible for comparing two strings.
  • n/a (/64/98a2b0db3f6e37d4d09ce3a5fa60ec265037cc641f0c0825cb8de65d62a5e6.file + 0x2015): This function is not available in the stack trace, indicating that it is a part of the agetty binary.
  • __libc_start_call_main (libc.so.6 + 0x35f5): This function is a part of the libc library and is responsible for calling the main function of the program.
  • __libc_start_main@@GLIBC_2.34 (libc.so.6 + 0x36a8): This function is a part of the libc library and is responsible for calling the main function of the program.
  • n/a (/64/98a2b0db3f6e37d4d09ce3a5fa60ec265037cc641f0c0825cb8de65d62a5e6.file + 0x44f5): This function is not available in the stack trace, indicating that it is a part of the agetty binary.

The ELF object binary architecture is AMD x86-64, indicating that the agetty binary is a 64-bit executable.

To troubleshoot the issue, we need to identify the root cause of the problem. Based on the error message and stack trace, it appears that the agetty process is crashing due to a bug in the libc library.

Step 1: Update the System

The first step is to update the system to the latest version of Fedora 42. This will ensure that any known bugs are fixed, and the system is up-to-date.

Step 2: Reinstall the Agetty Package

The next step is to reinstall the agetty package. This will ensure that the agetty binary is reinstalled with the latest version.

sudo dnf reinstall agetty

Step 3: Reconfigure the Serial-Getty Service

The final step is to reconfigure the serial-getty service to start automatically on boot.

sudo systemctl enable serial-getty@ttyS0.service

In this article, we explored the issue of the serial-getty@ttyS0.service failing to start after an automatic update to Fedora 42. We analyzed the error message and stack trace to identify the root cause of the problem. We provided a step-by-step solution to resolve the issue, including updating the system, reinstalling the agetty package, and reconfiguring the serial-getty service. By following these steps, you should be able to resolve the issue and get the serial-getty@ttyS0.service running smoothly.

  • If you are experiencing issues with the serial-getty service, try disabling it and then re-enabling it.
  • If you are using a custom kernel, try updating to the latest version of the kernel.
  • If you are experiencing issues with the agetty binary, try reinstalling it.

In our previous article, we explored the issue of the serial-getty@ttyS0.service failing to start after an automatic update to Fedora 42. We analyzed the error message and stack trace to identify the root cause of the problem and provided a step-by-step solution to resolve the issue. In this article, we will answer some frequently asked questions related to this issue.

Q: What is the serial-getty@ttyS0.service?

A: The serial-getty@ttyS0.service is a systemd service that manages the serial console on a system. It allows users to access the system's console over a serial connection.

Q: Why is the serial-getty@ttyS0.service failing to start?

A: The serial-getty@ttyS0.service is failing to start due to a bug in the libc library. This bug causes the agetty process to crash, resulting in a core dump.

Q: How do I update the system to the latest version of Fedora 42?

A: To update the system to the latest version of Fedora 42, you can use the following command:

sudo dnf update

Q: How do I reinstall the agetty package?

A: To reinstall the agetty package, you can use the following command:

sudo dnf reinstall agetty

Q: How do I reconfigure the serial-getty service to start automatically on boot?

A: To reconfigure the serial-getty service to start automatically on boot, you can use the following command:

sudo systemctl enable serial-getty@ttyS0.service

Q: What if I am experiencing issues with the serial-getty service?

A: If you are experiencing issues with the serial-getty service, try disabling it and then re-enabling it. You can use the following commands to do this:

sudo systemctl disable serial-getty@ttyS0.service
sudo systemctl enable serial-getty@ttyS0.service

Q: What if I am using a custom kernel?

A: If you are using a custom kernel, try updating to the latest version of the kernel. You can use the following command to update the kernel:

sudo dnf update kernel

Q: What if I am experiencing issues with the agetty binary?

A: If you are experiencing issues with the agetty binary, try reinstalling it. You can use the following command to reinstall the agetty binary:

sudo dnf reinstall agetty

Q: Where can I find more information about the serial-getty service?

A: You can find more information about the serial-getty service in the Fedora Project documentation. You can access the documentation by visiting the following URL:

https://docs.fedoraproject.org/en-US/project/docs/serial-getty-service/

In this article, we answered some frequently asked questions related to the issue of the serial-getty@ttyS0.service failing to start after an automatic update to Fedora 42. We provided step-by-step solutions to resolve the issue and offered additional tips and resources for troubleshooting the problem. By following these steps and tips, you should be able to resolve the issue and get the serial-getty@ttyS0.service running smoothly.

  • Always update your system to the latest version of Fedora 42 to ensure that any known bugs are fixed.
  • Reinstall the agetty package if you are experiencing issues with the agetty binary.
  • Reconfigure the serial-getty service to start automatically on boot if it is not already configured to do so.