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Merge branch 'PROTechThor-vm-troubleshooting'
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Andrew David Wong
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doc.md
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doc.md
@ -123,6 +123,7 @@ Core documentation for Qubes users.
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* [Installation Troubleshooting](/doc/installation-troubleshooting)
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* [UEFI Troubleshooting](/doc/uefi-troubleshooting/)
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* [Suspend/Resume Troubleshooting](/doc/suspend-resume-troubleshooting/)
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* [VM Troubleshooting](/doc/vm-troubleshooting/)
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### Reference Pages
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@ -274,7 +275,6 @@ For more, please see [Qubes Community Documentation](https://github.com/Qubes-Co
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* [Lenovo ThinkPad Troubleshooting](/doc/thinkpad-troubleshooting/)
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* [Apple MacBook Troubleshooting](/doc/macbook-troubleshooting/)
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* [Getting Sony Vaio Z laptop to work with Qubes](/doc/sony-vaio-tinkering/)
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* [How to remove VMs manually](/doc/remove-vm-manually/)
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* [Intel Integrated Graphics Troubleshooting](/doc/intel-igfx-troubleshooting/)
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### Building Guides
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@ -355,12 +355,7 @@ The output should look like this:
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#### Troubleshooting
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In case of problems, you can access the VM console using `qvm-console-dispvm VMNAME` in dom0, then access the GRUB menu.
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You need to call it just after starting the VM (until `GRUB_TIMEOUT` expires); for example, in a separate dom0 terminal window.
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In any case you can later access the VM's logs (especially the VM console log `/var/log/xen/console/guest-VMNAME.log`).
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You can always set the kernel back to some dom0-provided value to fix a VM kernel installation.
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In case of problems, visit the [VM Troubleshooting guide](/doc/vm-troubleshooting/#vm-kernel-troubleshooting) to learn how to access the VM console, view logs and fix a VM kernel installation.
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[dom0-kernel-upgrade]: /doc/software-update-dom0/#kernel-upgrade
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@ -103,17 +103,7 @@ The lesson is that you should carefully look at what is being installed to your
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### Package installation errors in Qubes 4.0
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By default, templates in 4.0 only have a loopback interface.
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Some packages will throw an error on installation in this situation.
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For example, Samba expects to be configured using a network interface post installation.
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One solution is to add a dummy interface to allow the package to install correctly:
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ip link add d0 type dummy
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ip addr add 192.168.0.1/24 dev d0
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ip link set d0 up
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If some packages throw installation errors, see [this guide.](/doc/vm-troubleshooting/#fixing-package-installation-errors)
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[TemplateVM]: /doc/templates/
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[Minimal TemplateVMs]: /doc/templates/minimal/
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73
user/troubleshooting/vm-troubleshooting.md
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73
user/troubleshooting/vm-troubleshooting.md
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@ -0,0 +1,73 @@
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---
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layout: doc
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title: VM Troubleshooting
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permalink: /doc/vm-troubleshooting/
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redirect_from:
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- /doc/remove-vm-manually/
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---
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# VM troubleshooting #
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## VM Kernel troubleshooting ##
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This troubleshoot applies to the non-default kernel choice described in the [Managing VM docs](https://www.qubes-os.org/doc/managing-vm-kernel/#using-kernel-installed-in-the-vm).
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In case of problems, you can access the VM console using `qvm-console-dispvm VMNAME` in dom0, then access the GRUB menu.
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You need to call it just after starting the VM (until `GRUB_TIMEOUT` expires); for example, in a separate dom0 terminal window.
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In any case you can later access the VM's logs (especially the VM console log `/var/log/xen/console/guest-VMNAME.log`).
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You can always set the kernel back to some dom0-provided value to fix a VM kernel installation.
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## Qubes starts, but no VMs load ##
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First, try to start a particular VM, check any failure message and direct further steps based on that.
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This issue has been seen to occur if a dom0 update is interrupted halfway through and/or a hard power off is done without shutting down Qubes, which results in files getting corrupted.
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## Can not uninstall a VM / “ERROR: VM installed by package manager: template-vm-name”
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Try the [normal method] before resorting to this method to remove a VM manually.
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All of the following commands should be executed in a dom0 terminal.
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When a template is marked as 'installed by package manager', but cannot be uninstalled there, trying to uninstall manually will result in the error "ERROR: VM installed by package manager: template-vm-name". Do as follows to be able to uninstall the template:
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1. Check the state of `installed_by_rpm`
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$ qvm-prefs template-vm-name
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2. If `installed_by_rpm - True]`, mark the template as not installed by package manager
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$ qvm-prefs template-vm-name installed_by_rpm false
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3. Re-check the state of `installed_by_rpm`
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- If `installed_by_rpm - False`, remove the template like you would a regular qube:
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$ qvm-remove template-vm-name
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- If `installed_by_rpm` remains `True`, reboot your computer to bring qubes.xml in sync with qubesd, and try again to remove the template.
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[normal method]: /doc/templates/#uninstalling
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## Fixing package installation errors ##
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By default, templates in 4.0 only have a loopback interface.
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Some packages will throw an error on installation in this situation.
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For example, Samba expects to be configured using a network interface post installation.
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One solution is to add a dummy interface to allow the package to install correctly:
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ip link add d0 type dummy
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ip addr add 192.168.0.1/24 dev d0
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ip link set d0 up
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## "Cannot connect to qrexec agent" error ##
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If you face this error when starting a VM, look into the VM logs at `/var/log/xen/console/guest-VMNAME.log`.
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Common reasons that may be revealed are: too low memory, corrupted files or a VM crash on startup.
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If the error occurs as a result of too little initial memory, increase the initial memory from 200MB to 400MB by navigating to VM settings » Advanced » Initial memory.
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@ -1,121 +0,0 @@
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---
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layout: doc
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title: Wireless Troubleshooting
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permalink: /doc/wireless-troubleshooting/
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redirect_from:
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- /en/doc/wireless-troubleshooting/
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---
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Wireless Troubleshooting Guide
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==============================
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These instructions may help with suspend/resume issues for more devices than just wireless cards, that is just the (unfortunately not uncommon) example used here.
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Resetting wireless cards by reloading drivers
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---------------------------------------------
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If your wireless card works, but after suspending and resuming your computer, the Network-Manager applet just says "Device not ready", then try un-loading and re-loading the driver.
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### Determining your wireless card driver ###
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First, determine which kernel module corresponds to your wireless card. There are several ways to do this.
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The easiest is via the output of `lspci -k` in your sys-net VM:
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~~~
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[user@sys-net ~]$ lspci -k
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00:00.0 Network controller: Intel Corporation Wireless 8260 (rev 3a)
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Subsystem: Intel Corporation Device 0130
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Kernel driver in use: iwlwifi
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Kernel modules: iwlwifi
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~~~
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Here we see that the machine in question has an Intel wireless card, being used by the `iwlwifi` kernel module.
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### Checking logs for relevant messages ###
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View the output of `dmesg` in sys-net, and check if you see a bunch of wireless related errors. Depending on your hardware, they may look like the following (or not):
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~~~
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iwlwifi 0000:00:00.0: loaded firmware version 16.242414.0 op_mode iwlmvm
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iwlwifi 0000:00:00.0: Detected Intel(R) Dual Band Wireless AC 8260, REV=0x208
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...
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IPv6: ADDRCONF(NETDEV_UP): wlp0s0: link is not ready
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iwlwifi 0000:00:00.0: L1 Enabled - LTR Enabled
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iwlwifi 0000:00:00.0: L1 Enabled - LTR Enabled
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iwlwifi 0000:00:00.0: Failed to load firmware chunk!
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iwlwifi 0000:00:00.0: Could not load the [0] uCode section
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iwlwifi 0000:00:00.0: Failed to start INIT ucode: -110
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iwlwifi 0000:00:00.0: Failed to run INIT ucode: -110
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...
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iwlwifi 0000:00:00.0: Direct firmware load for iwlwifi-8000C-18.ucode failed with error -2
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~~~
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### Seeing what modules you have loaded ###
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You can check which drivers are currently loaded with `lsmod`, and view details about a module with `modinfo <module_name>`.
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For example, we list what modules we have loaded:
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~~~
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[user@sys-net ~]$ lsmod
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Module Size Used by
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iwlmvm 315392 0
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iwlwifi 155648 1 iwlmvm
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mac80211 708608 1 iwlmvm
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cfg80211 557056 3 iwlwifi,mac80211,iwlmvm
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...
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~~~
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and check one:
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~~~
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[user@sys-net ~]$ modinfo iwlmvm | grep -E '^(description|author|depends):'
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author: Copyright(c) 2003- 2015 Intel Corporation <ilw@linux.intel.com>
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description: The new Intel(R) wireless AGN driver for Linux
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depends: iwlwifi,mac80211,cfg80211
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~~~
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Hey, it's our wireless driver!
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Now, check if reloading the module makes wireless work again:
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~~~
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[user@sys-net ~]$ sudo rmmod iwlmvm
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[user@sys-net ~]$ sudo modprobe iwlmvm
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~~~
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and try reconnecting to a network that is known to work.
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If that is successful, see below about having Qubes automatically reload the driver for you. If not, try also reloading some dependent modules, in our example we must also reload iwlwifi:
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~~~
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[user@sys-net ~]$ modinfo iwlwifi | grep -E '^(description|author|depends):'
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author: Copyright(c) 2003- 2015 Intel Corporation <ilw@linux.intel.com>
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description: Intel(R) Wireless WiFi driver for Linux
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depends: cfg80211
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~~~
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~~~
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[user@sys-net ~]$ sudo rmmod iwlmvm
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[user@sys-net ~]$ sudo rmmod iwlwifi
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[user@sys-net ~]$ sudo modprobe iwlwifi # note the reverse order of loading/unloading
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[user@sys-net ~]$ sudo modprobe iwlmvm
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~~~
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Automatically reloading drivers on suspend/resume
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-------------------------------------------------
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If reloading the driver (which resets the hardware into a known-state) resolves your issue when done manually, you can have Qubes automatically un/reload them on suspend & resume by listing the relevant modules in `/rw/config/suspend-module-blacklist`.
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In the above example, it would look like this:
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~~~
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[user@sys-net config]$ cat /rw/config/suspend-module-blacklist
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# You can list here modules you want to be unloaded before going to sleep. This
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# file is used only if the VM has any PCI device assigned. Modules will be
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# automatically loaded after resume.
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iwlmvm
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iwlwifi
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~~~
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