1) Forums : Technical Support : Postponed : Communication with VM Hypervisor failed. (Message 23018)
Posted 20 Apr 2022 by Dark Angel
Post:
In running into this exact error I've searched forums, reverted VBox versions, and had no success.

I ran into this in the logs though:
VBoxManage: error: Failed to create the VirtualBox object!
VBoxManage: error: Document is empty.
VBoxManage: error: Location: '/var/lib/boinc-client/.config/VirtualBox/VirtualBox.xml', line 1 (0), column 1.


As a shot in the dark I copied the contents of that file from a working machine and low and behold, it's now processing and returning work.

The contents I used:
<?xml version="1.0"?>
<!--
** DO NOT EDIT THIS FILE.
** If you make changes to this file while any VirtualBox related application
** is running, your changes will be overwritten later, without taking effect.
** Use VBoxManage or the VirtualBox Manager GUI to make changes.
-->
<VirtualBox xmlns="http://www.virtualbox.org/" version="1.12-linux">
  <Global>
    <MachineRegistry>
      <MachineEntry uuid="{d726afa8-be30-4514-a0f3-06e15fae92cf}" src="/var/lib/boinc-client/slots/3/boinc_bd5dc748189d0589/boinc_bd5dc748189d0589.vbox"/>
      <MachineEntry uuid="{b3bc6442-984f-4a9b-b913-d6ec6c5dfccc}" src="/var/lib/boinc-client/slots/0/boinc_d069ceda5c16c20e/boinc_d069ceda5c16c20e.vbox"/>
      <MachineEntry uuid="{3550ecef-157e-404b-96ab-dc05cad5a5b9}" src="/var/lib/boinc-client/slots/5/boinc_77ca626375dda854/boinc_77ca626375dda854.vbox"/>
      <MachineEntry uuid="{99cfb567-d29e-48d9-ae1a-95e091814a35}" src="/var/lib/boinc-client/slots/4/boinc_83786e619ac3bfcc/boinc_83786e619ac3bfcc.vbox"/>
      <MachineEntry uuid="{d9a6c5a7-d2bf-4cbc-9527-c2151cb57c6e}" src="/var/lib/boinc-client/slots/8/boinc_8f8ea12df9ed9f07/boinc_8f8ea12df9ed9f07.vbox"/>
      <MachineEntry uuid="{d7f76057-83f2-455d-bedc-59f3f2d2c48a}" src="/var/lib/boinc-client/slots/9/boinc_e64f2b0dbb639f20/boinc_e64f2b0dbb639f20.vbox"/>
      <MachineEntry uuid="{3bf4193d-6572-441d-b562-6bde17b5e892}" src="/var/lib/boinc-client/slots/7/boinc_e8b74785b7aaf53a/boinc_e8b74785b7aaf53a.vbox"/>
      <MachineEntry uuid="{504d46a0-5741-4e01-a41a-8f4bcde3e5d3}" src="/var/lib/boinc-client/slots/2/boinc_4762c88f6b4a1660/boinc_4762c88f6b4a1660.vbox"/>
      <MachineEntry uuid="{c1c7041c-ec24-4ee4-869b-0308fb29d8a3}" src="/var/lib/boinc-client/slots/6/boinc_6249471256c81c16/boinc_6249471256c81c16.vbox"/>
      <MachineEntry uuid="{9cc2aad1-edc7-4ad8-85f3-22b0b1106297}" src="/var/lib/boinc-client/slots/1/boinc_65e7b8d499bd2edb/boinc_65e7b8d499bd2edb.vbox"/>
      <MachineEntry uuid="{fca8ad8f-ca5b-4dc6-be4a-123366368055}" src="/var/lib/boinc-client/slots/3/boinc_7b169ab0a7a4721d/boinc_7b169ab0a7a4721d.vbox"/>
      <MachineEntry uuid="{2ec6d215-88d2-4b92-b6bd-b0d06617b27a}" src="/var/lib/boinc-client/slots/14/boinc_1a151d00f7d757af/boinc_1a151d00f7d757af.vbox"/>
      <MachineEntry uuid="{7fd91d9e-32bd-4e4c-9a9b-2a7fac4988db}" src="/var/lib/boinc-client/slots/13/boinc_b7cab3c4e52038c2/boinc_b7cab3c4e52038c2.vbox"/>
      <MachineEntry uuid="{958d6de3-e394-4d9b-ac1f-56b3a6b51c95}" src="/var/lib/boinc-client/slots/14/boinc_3a856d6fa63ec01b/boinc_3a856d6fa63ec01b.vbox"/>
      <MachineEntry uuid="{c7e9c80f-016f-494a-945b-531dafb45ee1}" src="/var/lib/boinc-client/slots/5/boinc_7bc03dd04396d04b/boinc_7bc03dd04396d04b.vbox"/>
      <MachineEntry uuid="{430befbf-94cd-44a7-add6-517a319d4020}" src="/var/lib/boinc-client/slots/10/boinc_6628cdb1d4dafbd4/boinc_6628cdb1d4dafbd4.vbox"/>
      <MachineEntry uuid="{85b52ae2-3837-4477-ae82-1b3ef9933b3c}" src="/var/lib/boinc-client/slots/1/boinc_c83b1ebaa5f6f2a8/boinc_c83b1ebaa5f6f2a8.vbox"/>
      <MachineEntry uuid="{92230b20-5166-477a-95a3-7bf5c612f7cc}" src="/var/lib/boinc-client/slots/0/boinc_e755cdff5a70a891/boinc_e755cdff5a70a891.vbox"/>
      <MachineEntry uuid="{0b40b141-d9e7-47b4-a976-1282a91fab40}" src="/var/lib/boinc-client/slots/6/boinc_1c47f00052348558/boinc_1c47f00052348558.vbox"/>
      <MachineEntry uuid="{37995b7b-c072-4c01-a680-7f6cda7b09eb}" src="/var/lib/boinc-client/slots/3/boinc_c8e61087f3d5fa0a/boinc_c8e61087f3d5fa0a.vbox"/>
      <MachineEntry uuid="{101285cb-c024-4e10-8fd5-f9ff2b77b8f0}" src="/var/lib/boinc-client/slots/1/boinc_384163016036cbcd/boinc_384163016036cbcd.vbox"/>
      <MachineEntry uuid="{7ed5a0c1-48e2-4fc7-8072-6273b71819c8}" src="/var/lib/boinc-client/slots/7/boinc_63d71d1809e1ec64/boinc_63d71d1809e1ec64.vbox"/>
      <MachineEntry uuid="{ab4da454-318d-4a16-9875-5bc549821abb}" src="/var/lib/boinc-client/slots/4/boinc_1d17c0a0a98fcde9/boinc_1d17c0a0a98fcde9.vbox"/>
      <MachineEntry uuid="{91326921-1695-4d2a-96c5-477bcd118ee9}" src="/var/lib/boinc-client/slots/11/boinc_b6c51a9c17ec76fb/boinc_b6c51a9c17ec76fb.vbox"/>
      <MachineEntry uuid="{46b37f63-f4a2-44ac-b829-7cdc752cb2b5}" src="/var/lib/boinc-client/slots/8/boinc_42464e5d76f852fb/boinc_42464e5d76f852fb.vbox"/>
      <MachineEntry uuid="{ea67cab6-2c92-4f1c-beaf-8234d40b5f27}" src="/var/lib/boinc-client/slots/5/boinc_fc9e40b38aa5365b/boinc_fc9e40b38aa5365b.vbox"/>
      <MachineEntry uuid="{5a7c5b1a-1339-4bd0-a5a6-78612b2193e5}" src="/var/lib/boinc-client/slots/9/boinc_6c45cf5b898a79e4/boinc_6c45cf5b898a79e4.vbox"/>
      <MachineEntry uuid="{996038fe-553e-4440-8774-7ab27c602200}" src="/var/lib/boinc-client/slots/5/boinc_e407df959dddf8f8/boinc_e407df959dddf8f8.vbox"/>
      <MachineEntry uuid="{2278a5b5-29a7-4f15-80eb-d39e29127217}" src="/var/lib/boinc-client/slots/10/boinc_2411250e4fd0ce6c/boinc_2411250e4fd0ce6c.vbox"/>
    </MachineRegistry>
    <NetserviceRegistry>
      <DHCPServers>
        <DHCPServer networkName="HostInterfaceNetworking-vboxnet0" IPAddress="192.168.56.100" networkMask="255.255.255.0" lowerIP="192.168.56.101" upperIP="192.168.56.254" enabled="1"/>
      </DHCPServers>
    </NetserviceRegistry>
    <SystemProperties defaultMachineFolder="/var/lib/boinc-client/VirtualBox VMs" defaultHardDiskFormat="VDI" VRDEAuthLibrary="VBoxAuth" webServiceAuthLibrary="VBoxAuth" LogHistoryCount="3" proxyMode="0" exclusiveHwVirt="true"/>
    <USBDeviceFilters/>
  </Global>
</VirtualBox>
2) Forums : Technical Support : Servers not running (Message 22692)
Posted 13 Nov 2020 by Dark Angel
Post:
The Feeder, camb_boinc2docker_work_generator, db_purge (camb_boinc2docker), and db_purge (camb) are not running.

Without the Feeder we cannot report completed work, even if there is space on the server hard drives.
3) Forums : Technical Support : Uploads Stopped - Out of Disk Space (Message 22687)
Posted 12 Nov 2020 by Dark Angel
Post:
Since apparently the results aren't being used for anything, "rm -rf /*" should work just fine.
4) Forums : Technical Support : Uploads Stopped - Out of Disk Space (Message 22685)
Posted 11 Nov 2020 by Dark Angel
Post:
This is one way to make sure the project doesn't get picked for a sprint I suppose. Pretty poor form to lock it down for all the regulars though.