If you want help from the big brothers, here’s what they had to say about ZRAM, based on your last journalctl:
Copilot
The error messages indicate that the system is trying to change the disk size of an already initialized zRAM device, which is not allowed¹. This could be due to a conflict with another process or service that is using the device.
To resolve this issue, you can try the following steps:
-
Disable the current zRAM device: You can disable the current zRAM device using the command sudo swapoff /dev/zram0³.
-
Reset the zRAM device: After disabling the zRAM device, you can reset it using the command sudo zramctl --reset /dev/zram0³.
-
Reconfigure zRAM: Once the zRAM device has been reset, you can reconfigure it according to your needs.
To verify whether zRAM is enabled or not on your system, you can run the command cat /proc/swaps. If you see an output that contains /dev/zram0 or similar then you have zRAM already enabled on your system¹. If not, you may need to enable it.
Please note that these commands should be executed with root privileges. If the problem persists, it might be worth checking if the zRAM module is properly installed⁴. If not, you may need to install it using the appropriate package manager for your distribution.
Remember to always back up important data before making significant changes to your system configuration.
Source: Conversation with Copilot, 7/25/2024
(1) Enable Zram on Linux For Better System Performance - FOSS Post. Enable Zram On Linux For Better System Performance.
(2) Hi all! got this error on Linux— /dev/zram0: write error: Text file … Hi all! got this error on Linux— /dev/zram0: write error: Text file busy - Super User.
(3) Has zram been removed in the latest ubuntu (17.10)?. swap - Has zram been removed in the latest ubuntu (17.10)? - Ask Ubuntu.
(4) How to enable the zRAM module for faster swapping on Linux. How to enable the zRAM module for faster swapping on Linux | TechRepublic.
(5) zram: Compressed RAM based block devices — The Linux Kernel documentation. zram: Compressed RAM based block devices — The Linux Kernel documentation.
(6) undefined. https://assets.techrepublic.com/uploads/2021/02/20210225-zRAM-Jack.mp4?_=2.
GPT-4o
Diagnosing the ZRAM Installation Issue
The error messages from journalctl indicate that there is an issue with configuring the ZRAM device. Here are the key points from the log:
-
Initialization Error:
Jul 24 12:52:05 pureos kernel: zram: Cannot change disksize for initialized device
Jul 24 12:52:05 pureos zram-generator[8424]: Error: Failed to configure disk size into /sys/block/zram0/disksize
Jul 24 12:52:05 pureos zram-generator[8424]: Caused by:
Jul 24 12:52:05 pureos zram-generator[8424]: Device or resource busy (os error 16)
-
Configuration File Issue:
Jul 24 12:52:05 pureos zram_generator::config[8424]: /usr/lib/systemd/zram-generator.conf.d/librem5.conf: ignoring settings outside of section: Properties { data: {“zram-fraction”: “2 (accepts decimal number, and seems unlimited (i tried 6 with no problems))”, “max-zram-size”: “none (or 4096)”} }
Possible Causes and Solutions
1. Device Already Initialized
The error Cannot change disksize for initialized device suggests that the ZRAM device /dev/zram0 is already initialized and cannot be reconfigured without resetting it first.
Solution:
2. Configuration File Syntax
The log indicates that the configuration file /usr/lib/systemd/zram-generator.conf.d/librem5.conf has settings outside the expected section. This might be causing the generator to ignore important settings.
Solution:
3. Resource Busy Error
The Device or resource busy (os error 16) error indicates that the device is in use or locked by another process.
Solution:
- Ensure no other process is using the ZRAM device. You can check the current status with:
sudo zramctl
Verification Steps
-
Check ZRAM Status:
sudo zramctl
This command will show the current status of ZRAM devices, including their size, compression algorithm, and usage.
-
Review Configuration:
Ensure the configuration file is correctly formatted and located in the appropriate directory:
cat /usr/lib/systemd/zram-generator.conf.d/librem5.conf
-
Reset and Reconfigure ZRAM:
sudo zramctl --reset /dev/zram0
sudo systemctl restart systemd-zram-setup@zram0.service
-
Check Logs:
After making changes, check the logs again to ensure there are no errors:
journalctl -xe
By following these steps, you should be able to diagnose and resolve the issues with your ZRAM installation. If the problem persists, consider reviewing the systemd and ZRAM documentation for further troubleshooting tips.
What about the network messages…?
Copilot
This could be due to a variety of reasons such as a problem with the DHCP server, a network connectivity issue, or a configuration problem on the usb0 interface1.
To troubleshoot this issue, you can try the following steps:
- Check the Network Configuration: Ensure that the
usb0 interface is configured to use DHCP and that the configuration is correct.
- Check the DHCP Server: If the DHCP server is under your control, check its configuration and logs to see if there are any issues.
- Check Network Connectivity: Ensure that the
usb0 interface is properly connected to the network and that it can reach the DHCP server.
- Restart the Network Service: Sometimes, simply restarting the network service can resolve the issue. You can do this with the command
sudo systemctl restart NetworkManager.
Remember to execute these commands with root privileges. If the problem persists, you may need to delve deeper into network troubleshooting or consider reaching out to your network administrator or ISP for assistance. Always remember to back up important data before making significant changes to your system configuration.
GPT-4o
Understanding the Network Messages in journalctl
The network-related messages in your journalctl logs indicate issues with the DHCP (Dynamic Host Configuration Protocol) process on the usb0 interface. Here are the key points from the log:
-
DHCP Request Timeout:
Jul 24 12:52:12 pureos NetworkManager[584]: [1721843532.4950] dhcp4 (usb0): request timed out
Jul 24 12:52:12 pureos NetworkManager[584]: [1721843532.4953] dhcp4 (usb0): state changed unknown → timeout
-
IP Configuration Failure:
Jul 24 12:52:12 pureos NetworkManager[584]: [1721843532.4955] device (usb0): state change: ip-config → failed (reason ‘ip-config-unavailable’, sys-iface-state: ‘managed’)
Possible Causes and Solutions
1. DHCP Server Unavailability
The DHCP request timeout suggests that the DHCP server did not respond to the request from the usb0 interface. This could be due to the DHCP server being down or unreachable.
Solution:
- Verify that the DHCP server is running and accessible. You can check the status of the DHCP server on your network or contact your network administrator.
2. Network Interface Issues
The usb0 interface might be experiencing issues that prevent it from communicating with the DHCP server.
Solution:
3. Configuration Problems
There might be a misconfiguration in the network settings for the usb0 interface.
Solution:
Verification Steps
-
Check Network Interface Status:
ip addr show usb0
This command will show the current status and configuration of the usb0 interface.
-
Review NetworkManager Logs:
journalctl -u NetworkManager
This will provide more detailed logs from NetworkManager, which can help diagnose the issue further.
-
Ping the DHCP Server:
If you know the IP address of the DHCP server, try pinging it to ensure it is reachable:
ping <DHCP_SERVER_IP>
-
Check DHCP Client Logs:
sudo journalctl -u dhclient
This will show logs related to the DHCP client, which can provide more insights into why the DHCP request is timing out.
By following these steps, you should be able to diagnose and resolve the network issues indicated by the journalctl logs. If the problem persists, consider consulting the documentation for your specific network setup or seeking assistance from your network administrator.
And analysing also the previous log, with combo answer:
Copilot
The log shows two main issues:
-
ZRAM Configuration Error: The system is trying to create a swap on /dev/zram0, but it’s failing because the device is busy¹⁸. This could be due to an attempt to change the disk size of an initialized ZRAM device⁹. To resolve this, you can try the following steps:
- Modify the ZRAM configuration file located at
/etc/systemd/zram-generator.conf⁹.
- Ensure that the
zram-fraction and max-zram-size are set correctly⁹.
- If the issue persists, you may need to disable the device, make the necessary changes, and then re-enable it³.
-
Network Connection Issue: The DHCP request for usb0 is timing out, causing the network connection to fail. This could be due to a problem with the network cable, router, or the network configuration on the system. Here are some troubleshooting steps:
- Check the physical connection of your network cable.
- Try restarting your router.
- Check your network configuration settings.
- If the issue persists, you may need to contact your Internet Service Provider.
Please note that these are general suggestions based on the provided log. The exact solution may vary depending on the specific configuration of your system. If the problem persists after trying these steps, I recommend seeking assistance from a system administrator or a technical support professional. They can provide more personalized assistance based on a detailed understanding of your system’s configuration.
Source: Conversation with Copilot, 7/25/2024
(1) [Solved] zram: Can’t change algorithm for initialized device (device or … [Solved] zram: Can't change algorithm for initialized device (device or resource busy) - Debian User Forums.
(2) permissions - How to change zram size? - Ask Ubuntu. permissions - How to change zram size? - Ask Ubuntu.
(3) Serial Getty on ttys0 - causes stalls on system/reboot. Serial Getty on ttys0 - causes stalls on system/reboot - Raspberry Pi Stack Exchange.
(4) Serial Getty error messages - Unix & Linux Stack Exchange. agetty - Serial Getty error messages - Unix & Linux Stack Exchange.
(5) What is the difference between serial-getty@ttyAMA0.service and getty … systemd - What is the difference between serial-getty@ttyAMA0.service and getty@ttyAMA0.service - Unix & Linux Stack Exchange.
(6) serial-getty@ttyS0.service - Technical Support - Toradex Community. serial-getty@ttyS0.service - Technical Support - Toradex Community.
(7) Enabling a Serial Port Console: getty systemd | Linux & Open Source. https://www.rogerirwin.co.nz/linux-open-source/enabling-a-serial-port-console/.
(8) systemd/zram-generator: Systemd unit generator for zram devices - GitHub. GitHub - systemd/zram-generator: Systemd unit generator for zram devices.
(9) zram-generator/man/zram-generator.conf.md at main - GitHub. zram-generator/man/zram-generator.conf.md at main · systemd/zram-generator · GitHub.
(10) GitHub - maximumadmin/zramd: Automatically setup swap on zram with … GitHub - maximumadmin/zramd: Automatically setup swap on zram ✨ with optional systemd support, a simpler alternative to zram-generator and systemd-swap.
(11) How to resize ZRAM (compressed swap) managed by systemd/zram-generator … How to resize ZRAM (compressed swap) managed by systemd/zram-generator | Ctrl blog.
(12) Aruba NetEdit 2.0: service serial-getty@ttyS0.service looping (hold-off … Aruba NetEdit 2.0: service serial-getty@ttyS0.service looping (hold-off time over) | Wired Intelligent Edge.
(13) Gadget serial (ttyGS0) hangs when no host is present; prevents reboot … Gadget serial (ttyGS0) hangs when no host is present; prevents reboot & shutdown · Issue #1929 · raspberrypi/linux · GitHub.
(14) NanoPi R2S - OTG g_serial (ttyGS0) not working - Forums. NanoPi R2S - OTG g_serial(ttyGS0) not working - Rockchip - Armbian Community Forums.
(15) Working with the serial console - ArchWiki. Working with the serial console - ArchWiki.
(16) How to set up properly zram and swap - Unix & Linux Stack Exchange. linux - How to set up properly zram and swap - Unix & Linux Stack Exchange.
(17) How to enable the zRAM module for faster swapping on Linux. How to enable the zRAM module for faster swapping on Linux | TechRepublic.
(18) QA:Testcase SwapOnZRAM stop - Fedora Project Wiki. QA:Testcase SwapOnZRAM stop - Fedora Project Wiki.
(19) zram swap config fails as the device is busy #119 - GitHub. zram swap config fails as the device is busy · Issue #119 · systemd/zram-generator · GitHub.
(20) Apply config changes? · Issue #78 · systemd/zram-generator. Apply config changes? · Issue #78 · systemd/zram-generator · GitHub.
(21) Re-reading the partition table failed with error 16: Device or resource … linux - Re-reading the partition table failed with error 16: Device or resource busy - Unix & Linux Stack Exchange.
(22) fails with 'zram: Cannot change disksize for initialized device … fails with 'zram: Cannot change disksize for initialized device' · Issue #7 · systemd/zram-generator · GitHub.
(23) zram: Compressed RAM-based block devices - Kernel. zram: Compressed RAM-based block devices — The Linux Kernel documentation.
(24) zram swap is not enabled after boot #6511 - GitHub. zram swap is not enabled after boot · Issue #6511 · MichaIng/DietPi · GitHub.
(25) service unit fails when host-memory-limit is set below the … - GitHub. service unit fails when host-memory-limit is set below the host memory · Issue #44 · systemd/zram-generator · GitHub.
(26) Automatically start zram swap device on boot with systemd. Automatically start zram swap device on boot with systemd.
(27) undefined. systemd for Administrators, Part XVI.
(28) undefined. https://github.com/armbian/build/tree/master/patch/kernel/rockchip64-dev.
(29) undefined. https://www.kernel.org/doc/Documentation/blockdev/zram.txt.
(30) undefined. https://assets.techrepublic.com/uploads/2021/02/20210225-zRAM-Jack.mp4?_=2.
(31) undefined. https://debian.nabijaczleweli.xyz/README.
(32) undefined. AUR (en) - zram-generator-git.
(33) undefined. Ubuntu Manpage: zramctl - set up and control zram devices.