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Ticket Resolution Summary Owner Reporter
#13058 obsolete Corrupt .VBOX file prevents registering VM potthast
Description

VirtualBox sometimes fails to restore a snapshot after a VM has been powered off (even when waiting for 10s). The error output from VBoxManage snapshot restore then says something about a lock not being released. This problem is well-known, but not what this ticket is about.

As a workaround, I have found that unregistering the VM, re-registering it, and then repeating the snapshot restoration does the trick... most of the time. Today, a VM where a snapshot restore failed was successfully unregistered but failed to be re-registered because the VBOX file was corrupted.

Here's what the HardDisks-tag of the corrupt VBOX file looked like:

      <HardDisks>
        <HardDisk uuid="{6cdc9791-c9f7-4eda-a5f0-decc464aac04}" location="pan14-modaresi14-2014-04-29-17-14-14-disk1.vmdk" format="VMDK" type="Normal">
          <HardDisk uuid="{46bd3294-0b17-486f-adbd-9ba62b192566}" location="Snapshots/{46bd3294-0b17-486f-adbd-9ba62b192566}.vmdk" format="VMDK">
            <HardDisk uuid="{835a7136-3041-44c1-bf65-bcbc954bf388}" location="Snapshots/{835a7136-3041-44c1-bf65-bcbc954bf388}.vmdk" format="VMDK">
              <HardDisk uuid="{b1f618da-8186-45f8-87e2-655e4817338b}" location="Snapshots/{b1f618da-8186-45f8-87e2-655e4817338b}.vmdk" format="VMDK">
                <HardDisk uuid="{b797adf5-5fcc-4149-a5a4-8f00d57b749d}" location="Snapshots/{b797adf5-5fcc-4149-a5a4-8f00d57b749d}.vmdk" format="VMDK">
                  <HardDisk uuid="{88737e2c-bac1-4906-b108-35f1cd5f4f75}" location="Snapshots/{88737e2c-bac1-4906-b108-35f1cd5f4f75}.vmdk" format="VMDK">
                    <HardDisk uuid="{d24d6e63-f516-4d9e-9180-1e0e2950e333}" location="Snapshots/{d24d6e63-f516-4d9e-9180-1e0e2950e333}.vmdk" format="VMDK">
                      <HardDisk uuid="{c1aa1657-fed5-488a-b743-d549fd4a8e05}" location="Snapshots/{c1aa1657-fed5-488a-b743-d549fd4a8e05}.vmdk" format="VMDK">
                        <HardDisk uuid="{48ea261f-bd7f-48e5-b941-15ed0d5a42f2}" location="Snapshots/{48ea261f-bd7f-48e5-b941-15ed0d5a42f2}.vmdk" format="VMDK">
                          <HardDisk uuid="{816344d3-747a-4d90-8358-121be771fa82}" location="Snapshots/{816344d3-747a-4d90-8358-121be771fa82}.vmdk" format="VMDK">
                            <HardDisk uuid="{1a3a468f-f407-4c33-9bc5-03b89f9ccd6c}" location="Snapshots/{1a3a468f-f407-4c33-9bc5-03b89f9ccd6c}.vmdk" format="VMDK">
                              <HardDisk uuid="{69055c13-31e2-49a4-b048-4dcec39cd0c3}" location="Snapshots/{69055c13-31e2-49a4-b048-4dcec39cd0c3}.vmdk" format="VMDK">
                                <HardDisk uuid="{43e733e0-d8a6-4794-9a3c-6b6d2b56d734}" location="Snapshots/{43e733e0-d8a6-4794-9a3c-6b6d2b56d734}.vmdk" format="VMDK">
                                  <HardDisk uuid="{2e8129f6-5c84-4797-86bf-0e8f2be1bbf5}" location="Snapshots/{2e8129f6-5c84-4797-86bf-0e8f2be1bbf5}.vmdk" format="VMDK">
                                    <HardDisk uuid="{3a63ab95-1845-4a1d-8c5a-1676c2fcaa2e}" location="Snapshots/{3a63ab95-1845-4a1d-8c5a-1676c2fcaa2e}.vmdk" format="VMDK">
                                      <HardDisk uuid="{fccc7c04-ebf5-42e4-9670-117afca2f787}" location="Snapshots/{fccc7c04-ebf5-42e4-9670-117afca2f787}.vmdk" format="VMDK">
                                        <HardDisk uuid="{69f80654-c381-43f1-9ab3-2e363a7acfb9}" location="Snapshots/{69f80654-c381-43f1-9ab3-2e363a7acfb9}.vmdk" format="VMDK">
                                          <HardDisk uuid="{1a05ae79-6450-45ca-9738-d272f3804863}" location="Snapshots/{1a05ae79-6450-45ca-9738-d272f3804863}.vmdk" format="VMDK">
                                            <HardDisk uuid="{f2c11d3a-c7f4-434a-b469-28bb24c77b4f}" location="Snapshots/{f2c11d3a-c7f4-434a-b469-28bb24c77b4f}.vmdk" format="VMDK">
                                              <HardDisk uuid="{2be77c45-3363-4029-84f2-5171ce68045a}" location="Snapshots/{2be77c45-3363-4029-84f2-5171ce68045a}.vmdk" format="VMDK">
                                                <HardDisk uuid="{3afa5d51-74a8-49bd-9692-0cdd8b398305}" location="Snapshots/{3afa5d51-74a8-49bd-9692-0cdd8b398305}.vmdk" format="VMDK">
                                                  <HardDisk uuid="{245b390d-6de9-4290-bc7f-f5af8fbd80a2}" location="Snapshots/{245b390d-6de9-4290-bc7f-f5af8fbd80a2}.vmdk" format="VMDK">
                                                    <HardDisk uuid="{9e94bb04-ff91-4619-990d-cf7dd99b570f}" location="Snapshots/{9e94bb04-ff91-4619-990d-cf7dd99b570f}.vmdk" format="VMDK"/>
                                                  </HardDisk>
                                                </HardDisk>
                                              </HardDisk>
                                            </HardDisk>
                                          </HardDisk>
                                        </HardDisk>
                                      </HardDisk>
                                    </HardDisk>
                                  </HardDisk>
                                </HardDisk>
                              </HardDisk>
                            </HardDisk>
                          </HardDisk>
                        </HardDisk>
                      </HardDisk>
                    </HardDisk>
                  </HardDisk>
                </HardDisk>
              </HardDisk>
            </HardDisk>
          </HardDisk>
        </HardDisk>
      </HardDisks>

The corruption in the VBOX file is as follows:

  1. Many snapshot hard disks were missing as evidenced by the fact that the number of Snapshot-tags is much larger than the number of HardDisk-tags.
  2. The inner-most hard disk caused re-registering to fail with the error message: "Medium ... cannot be closed because it is still attached to 1 virtual machines"
  3. There is no reference to the inner-most snapshot hard disk in the remaining VBOX file, although the corresponding VMDK file is present in the Snapshots folder.

I was able to repair the HardDisks-Tag of the VBOX file to a working state by grep-ing all the Image-tags and nesting HardDisk-tags in order of appearance of the Image-tags.

Here's what the HardDisks-tag of the working VBOX file looks like:

      <HardDisks>
        <HardDisk uuid="{6cdc9791-c9f7-4eda-a5f0-decc464aac04}" location="pan14-modaresi14-2014-04-29-17-14-14-disk1.vmdk" format="VMDK" type="Normal">
          <HardDisk uuid="{46bd3294-0b17-486f-adbd-9ba62b192566}" location="Snapshots/{46bd3294-0b17-486f-adbd-9ba62b192566}.vmdk" format="VMDK">
            <HardDisk uuid="{835a7136-3041-44c1-bf65-bcbc954bf388}" location="Snapshots/{835a7136-3041-44c1-bf65-bcbc954bf388}.vmdk" format="VMDK">
              <HardDisk uuid="{b1f618da-8186-45f8-87e2-655e4817338b}" location="Snapshots/{b1f618da-8186-45f8-87e2-655e4817338b}.vmdk" format="VMDK">
                <HardDisk uuid="{b797adf5-5fcc-4149-a5a4-8f00d57b749d}" location="Snapshots/{b797adf5-5fcc-4149-a5a4-8f00d57b749d}.vmdk" format="VMDK">
                  <HardDisk uuid="{88737e2c-bac1-4906-b108-35f1cd5f4f75}" location="Snapshots/{88737e2c-bac1-4906-b108-35f1cd5f4f75}.vmdk" format="VMDK">
                    <HardDisk uuid="{d24d6e63-f516-4d9e-9180-1e0e2950e333}" location="Snapshots/{d24d6e63-f516-4d9e-9180-1e0e2950e333}.vmdk" format="VMDK">
                      <HardDisk uuid="{c1aa1657-fed5-488a-b743-d549fd4a8e05}" location="Snapshots/{c1aa1657-fed5-488a-b743-d549fd4a8e05}.vmdk" format="VMDK">
                        <HardDisk uuid="{48ea261f-bd7f-48e5-b941-15ed0d5a42f2}" location="Snapshots/{48ea261f-bd7f-48e5-b941-15ed0d5a42f2}.vmdk" format="VMDK">
                          <HardDisk uuid="{816344d3-747a-4d90-8358-121be771fa82}" location="Snapshots/{816344d3-747a-4d90-8358-121be771fa82}.vmdk" format="VMDK">
                            <HardDisk uuid="{1a3a468f-f407-4c33-9bc5-03b89f9ccd6c}" location="Snapshots/{1a3a468f-f407-4c33-9bc5-03b89f9ccd6c}.vmdk" format="VMDK">
                              <HardDisk uuid="{69055c13-31e2-49a4-b048-4dcec39cd0c3}" location="Snapshots/{69055c13-31e2-49a4-b048-4dcec39cd0c3}.vmdk" format="VMDK">
                                <HardDisk uuid="{43e733e0-d8a6-4794-9a3c-6b6d2b56d734}" location="Snapshots/{43e733e0-d8a6-4794-9a3c-6b6d2b56d734}.vmdk" format="VMDK">
                                  <HardDisk uuid="{2e8129f6-5c84-4797-86bf-0e8f2be1bbf5}" location="Snapshots/{2e8129f6-5c84-4797-86bf-0e8f2be1bbf5}.vmdk" format="VMDK">
                                    <HardDisk uuid="{3a63ab95-1845-4a1d-8c5a-1676c2fcaa2e}" location="Snapshots/{3a63ab95-1845-4a1d-8c5a-1676c2fcaa2e}.vmdk" format="VMDK">
                                      <HardDisk uuid="{fccc7c04-ebf5-42e4-9670-117afca2f787}" location="Snapshots/{fccc7c04-ebf5-42e4-9670-117afca2f787}.vmdk" format="VMDK">
                                        <HardDisk uuid="{69f80654-c381-43f1-9ab3-2e363a7acfb9}" location="Snapshots/{69f80654-c381-43f1-9ab3-2e363a7acfb9}.vmdk" format="VMDK">
                                          <HardDisk uuid="{1a05ae79-6450-45ca-9738-d272f3804863}" location="Snapshots/{1a05ae79-6450-45ca-9738-d272f3804863}.vmdk" format="VMDK">
                                            <HardDisk uuid="{f2c11d3a-c7f4-434a-b469-28bb24c77b4f}" location="Snapshots/{f2c11d3a-c7f4-434a-b469-28bb24c77b4f}.vmdk" format="VMDK">
                                              <HardDisk uuid="{2be77c45-3363-4029-84f2-5171ce68045a}" location="Snapshots/{2be77c45-3363-4029-84f2-5171ce68045a}.vmdk" format="VMDK">
                                                <HardDisk uuid="{3afa5d51-74a8-49bd-9692-0cdd8b398305}" location="Snapshots/{3afa5d51-74a8-49bd-9692-0cdd8b398305}.vmdk" format="VMDK">
                                                  <HardDisk uuid="{245b390d-6de9-4290-bc7f-f5af8fbd80a2}" location="Snapshots/{245b390d-6de9-4290-bc7f-f5af8fbd80a2}.vmdk" format="VMDK">
                                                    <HardDisk uuid="{204f28d2-bc06-4f9a-99d1-6937d3725d70}" location="Snapshots/{204f28d2-bc06-4f9a-99d1-6937d3725d70}.vmdk" format="VMDK">
                                                      <HardDisk uuid="{8d7acfa6-e246-4245-aaae-e173ed774549}" location="Snapshots/{8d7acfa6-e246-4245-aaae-e173ed774549}.vmdk" format="VMDK">
                                                        <HardDisk uuid="{987e2fcf-ae47-4942-b22b-b19244788964}" location="Snapshots/{987e2fcf-ae47-4942-b22b-b19244788964}.vmdk" format="VMDK">
                                                          <HardDisk uuid="{d3c5ddec-76f8-407c-9cb2-644d0d02adfc}" location="Snapshots/{d3c5ddec-76f8-407c-9cb2-644d0d02adfc}.vmdk" format="VMDK">
                                                            <HardDisk uuid="{705cc449-b4c2-4805-82c4-feac91aeffda}" location="Snapshots/{705cc449-b4c2-4805-82c4-feac91aeffda}.vmdk" format="VMDK">
                                                              <HardDisk uuid="{9ac97287-cf13-4f74-9ffa-39e5d941533e}" location="Snapshots/{9ac97287-cf13-4f74-9ffa-39e5d941533e}.vmdk" format="VMDK">
                                                                <HardDisk uuid="{1aa4aba2-9ed5-4228-bb76-f5e7fe73996f}" location="Snapshots/{1aa4aba2-9ed5-4228-bb76-f5e7fe73996f}.vmdk" format="VMDK">
                                                                  <HardDisk uuid="{cfc72260-c42e-4fae-9a9c-7244a28354b5}" location="Snapshots/{cfc72260-c42e-4fae-9a9c-7244a28354b5}.vmdk" format="VMDK">
                                                                    <HardDisk uuid="{2bb3dd70-9f61-4b39-8e48-48042b712c8e}" location="Snapshots/{2bb3dd70-9f61-4b39-8e48-48042b712c8e}.vmdk" format="VMDK">
                                                                      <HardDisk uuid="{e2482718-d9e8-4ab8-98c4-639a5d5ebfca}" location="Snapshots/{e2482718-d9e8-4ab8-98c4-639a5d5ebfca}.vmdk" format="VMDK">
                                                                        <HardDisk uuid="{0b34d4d5-fa70-48c8-9bf5-40145149e90e}" location="Snapshots/{0b34d4d5-fa70-48c8-9bf5-40145149e90e}.vmdk" format="VMDK">
                                                                          <HardDisk uuid="{cb2c1490-1d16-4ab8-8e14-de3b7c090c87}" location="Snapshots/{cb2c1490-1d16-4ab8-8e14-de3b7c090c87}.vmdk" format="VMDK">
                                                                            <HardDisk uuid="{9392c2b1-fa61-4cb4-bc64-226daded14d5}" location="Snapshots/{9392c2b1-fa61-4cb4-bc64-226daded14d5}.vmdk" format="VMDK">
                                                                              <HardDisk uuid="{31bf1b73-7fc7-4947-8b01-9bd415b5560e}" location="Snapshots/{31bf1b73-7fc7-4947-8b01-9bd415b5560e}.vmdk" format="VMDK">
                                                                                <HardDisk uuid="{5033b8a6-fdfc-4948-9f86-ab1a99ecaa90}" location="Snapshots/{5033b8a6-fdfc-4948-9f86-ab1a99ecaa90}.vmdk" format="VMDK">
                                                                                  <HardDisk uuid="{244385d5-81e5-4ff6-a70b-9fca7e220b5a}" location="Snapshots/{244385d5-81e5-4ff6-a70b-9fca7e220b5a}.vmdk" format="VMDK">
                                                                                    <HardDisk uuid="{4acb4f3d-c88b-46c8-a466-c11f09126ad7}" location="Snapshots/{4acb4f3d-c88b-46c8-a466-c11f09126ad7}.vmdk" format="VMDK">
                                                                                      <HardDisk uuid="{89fcea3c-ddc9-4195-a78d-4fd791580f8e}" location="Snapshots/{89fcea3c-ddc9-4195-a78d-4fd791580f8e}.vmdk" format="VMDK">
                                                                                        <HardDisk uuid="{718d093f-738c-4cfe-b97a-40c541516040}" location="Snapshots/{718d093f-738c-4cfe-b97a-40c541516040}.vmdk" format="VMDK">
                                                                                          <HardDisk uuid="{cf518e7e-1a65-4f98-a05b-f0223c86e487}" location="Snapshots/{cf518e7e-1a65-4f98-a05b-f0223c86e487}.vmdk" format="VMDK">
                                                                                            <HardDisk uuid="{df714be3-cf6d-43e3-9dea-be103c4cf9d3}" location="Snapshots/{df714be3-cf6d-43e3-9dea-be103c4cf9d3}.vmdk" format="VMDK">
                                                                                              <HardDisk uuid="{2f076c0d-7048-4bd7-97db-b0f9870bf562}" location="Snapshots/{2f076c0d-7048-4bd7-97db-b0f9870bf562}.vmdk" format="VMDK">
                                                                                                <HardDisk uuid="{cd687f52-ae08-4467-a1e0-a26ed45710a7}" location="Snapshots/{cd687f52-ae08-4467-a1e0-a26ed45710a7}.vmdk" format="VMDK">
                                                                                                  <HardDisk uuid="{68055994-66db-498f-8595-ad2fc52fe631}" location="Snapshots/{68055994-66db-498f-8595-ad2fc52fe631}.vmdk" format="VMDK">
                                                                                                    <HardDisk uuid="{5c08df7c-ba4a-4424-9551-d26bbc7d950a}" location="Snapshots/{5c08df7c-ba4a-4424-9551-d26bbc7d950a}.vmdk" format="VMDK">
                                                                                                      <HardDisk uuid="{bf5dc01a-810b-40f1-9c67-7d6957cb221d}" location="Snapshots/{bf5dc01a-810b-40f1-9c67-7d6957cb221d}.vmdk" format="VMDK">
                                                                                                        <HardDisk uuid="{d5a1c6a2-d685-4bd8-b7a8-13926369f5cb}" location="Snapshots/{d5a1c6a2-d685-4bd8-b7a8-13926369f5cb}.vmdk" format="VMDK">
                                                                                                          <HardDisk uuid="{d717c7e2-cbc3-460b-bc0f-63c04621dd5c}" location="Snapshots/{d717c7e2-cbc3-460b-bc0f-63c04621dd5c}.vmdk" format="VMDK">
                                                                                                            <HardDisk uuid="{625c7504-e501-44da-8eb9-bab1f6427a3e}" location="Snapshots/{625c7504-e501-44da-8eb9-bab1f6427a3e}.vmdk" format="VMDK">
                                                                                                              <HardDisk uuid="{4d6e1b6e-b8fc-4e06-97c8-8498d766279f}" location="Snapshots/{4d6e1b6e-b8fc-4e06-97c8-8498d766279f}.vmdk" format="VMDK">
                                                                                                                <HardDisk uuid="{23b41c38-1535-42e4-a538-5895e699abb7}" location="Snapshots/{23b41c38-1535-42e4-a538-5895e699abb7}.vmdk" format="VMDK">
                                                                                                                  <HardDisk uuid="{a69b1007-aaa3-4040-b8ac-1c1fc7dd643e}" location="Snapshots/{a69b1007-aaa3-4040-b8ac-1c1fc7dd643e}.vmdk" format="VMDK">
                                                                                                                    <HardDisk uuid="{3bdd5f43-b7ed-47e8-999a-9a590082a96a}" location="Snapshots/{3bdd5f43-b7ed-47e8-999a-9a590082a96a}.vmdk" format="VMDK">
                                                                                                                      <HardDisk uuid="{b2f38d51-94ba-4c54-8973-cfb41360ded1}" location="Snapshots/{b2f38d51-94ba-4c54-8973-cfb41360ded1}.vmdk" format="VMDK">
                                                                                                                        <HardDisk uuid="{a9273e55-57f2-4f6c-ba0e-11e05c859460}" location="Snapshots/{a9273e55-57f2-4f6c-ba0e-11e05c859460}.vmdk" format="VMDK">
                                                                                                                          <HardDisk uuid="{281423d9-8781-43c5-b86d-a4ec6b9a09cc}" location="Snapshots/{281423d9-8781-43c5-b86d-a4ec6b9a09cc}.vmdk" format="VMDK">
                                                                                                                            <HardDisk uuid="{ebb6e097-a503-46f6-886b-c7587f8f9e6d}" location="Snapshots/{ebb6e097-a503-46f6-886b-c7587f8f9e6d}.vmdk" format="VMDK">
                                                                                                                              <HardDisk uuid="{553a30ca-4112-4a14-86b6-2ad2f67ffe73}" location="Snapshots/{553a30ca-4112-4a14-86b6-2ad2f67ffe73}.vmdk" format="VMDK">
                                                                                                                                <HardDisk uuid="{c2ffda0e-faff-4023-829c-223d43498a79}" location="Snapshots/{c2ffda0e-faff-4023-829c-223d43498a79}.vmdk" format="VMDK">
                                                                                                                                  <HardDisk uuid="{315bf384-59dd-40d3-903f-0a2cfb9d5b03}" location="Snapshots/{315bf384-59dd-40d3-903f-0a2cfb9d5b03}.vmdk" format="VMDK">
                                                                                                                                    <HardDisk uuid="{3ed3831f-bd94-4d80-bcb5-cdd97dd13ffc}" location="Snapshots/{3ed3831f-bd94-4d80-bcb5-cdd97dd13ffc}.vmdk" format="VMDK">
                                                                                                                                      <HardDisk uuid="{1ab91e63-285e-4148-9d9c-9c0dcce6e5a0}" location="Snapshots/{1ab91e63-285e-4148-9d9c-9c0dcce6e5a0}.vmdk" format="VMDK">
                                                                                                                                        <HardDisk uuid="{a863f14d-7e8f-4bb6-8124-7141c374e224}" location="Snapshots/{a863f14d-7e8f-4bb6-8124-7141c374e224}.vmdk" format="VMDK">
                                                                                                                                          <HardDisk uuid="{5558ce8c-b9f9-445d-9587-ce492c8644b6}" location="Snapshots/{5558ce8c-b9f9-445d-9587-ce492c8644b6}.vmdk" format="VMDK">
                                                                                                                                            <HardDisk uuid="{5382344f-2a05-499a-b096-5b41a53a7a29}" location="Snapshots/{5382344f-2a05-499a-b096-5b41a53a7a29}.vmdk" format="VMDK">
                                                                                                                                              <HardDisk uuid="{62760b1c-484c-4d6b-bc68-0849f5d8a591}" location="Snapshots/{62760b1c-484c-4d6b-bc68-0849f5d8a591}.vmdk" format="VMDK"/>
                                                                                                                                            </HardDisk>
                                                                                                                                          </HardDisk>
                                                                                                                                        </HardDisk>
                                                                                                                                      </HardDisk>
                                                                                                                                    </HardDisk>
                                                                                                                                  </HardDisk>
                                                                                                                                </HardDisk>
                                                                                                                              </HardDisk>
                                                                                                                            </HardDisk>
                                                                                                                          </HardDisk>
                                                                                                                        </HardDisk>
                                                                                                                      </HardDisk>
                                                                                                                    </HardDisk>
                                                                                                                  </HardDisk>
                                                                                                                </HardDisk>
                                                                                                              </HardDisk>
                                                                                                            </HardDisk>
                                                                                                          </HardDisk>
                                                                                                        </HardDisk>
                                                                                                      </HardDisk>
                                                                                                    </HardDisk>
                                                                                                  </HardDisk>
                                                                                                </HardDisk>
                                                                                              </HardDisk>
                                                                                            </HardDisk>
                                                                                          </HardDisk>
                                                                                        </HardDisk>
                                                                                      </HardDisk>
                                                                                    </HardDisk>
                                                                                  </HardDisk>
                                                                                </HardDisk>
                                                                              </HardDisk>
                                                                            </HardDisk>
                                                                          </HardDisk>
                                                                        </HardDisk>
                                                                      </HardDisk>
                                                                    </HardDisk>
                                                                  </HardDisk>
                                                                </HardDisk>
                                                              </HardDisk>
                                                            </HardDisk>
                                                          </HardDisk>
                                                        </HardDisk>
                                                      </HardDisk>
                                                    </HardDisk>
                                                  </HardDisk>
                                                </HardDisk>
                                              </HardDisk>
                                            </HardDisk>
                                          </HardDisk>
                                        </HardDisk>
                                      </HardDisk>
                                    </HardDisk>
                                  </HardDisk>
                                </HardDisk>
                              </HardDisk>
                            </HardDisk>
                          </HardDisk>
                        </HardDisk>
                      </HardDisk>
                    </HardDisk>
                  </HardDisk>
                </HardDisk>
              </HardDisk>
            </HardDisk>
          </HardDisk>
        </HardDisk>
      </HardDisks>

Background: I make heavy use of the snapshot feature on hosts that run about 20 virtual machines in parallel, both Windows and Linux. These VMs are frequently being snapshot-ed and restored shortly after.

#712 worksforme Corrupt VM screen laser
Description

Host OS=WinXP32; Guest OS = WinXP32; VirtualBox = v1.5 Guest OS desktop size = 1280 x 1024 x 32bit. VM VRAMSize = 8Mb

Whilst working in my guest OS, editing a text document and using opera to download an small file from sourceforge, my VM's screen suddenly became corrupted and I had no way to access the guest OS desktop. The VM did not respond to Ctrl-Alt-Del, so I had to reset the VM to recover.

I have attached a snapshot of the corrupted screen - has anyone seen anything like that before. Is it a symptom of too little memory allocated to the video card?

Kind regards,

laser

#11429 fixed Corrupt VM settings window requries force quit of VirtualBox. Dude
Description

VirtualBox 4.2.6, Mac Pro 4.1, 10.6.8, 24 GB RAM.

It has happened to me several times that the settings window of a virtual machine is blank or corrupted, e.g. showing only the toolbar, and requires to force quite the VirtualBox application. The problem apparently occurs regardless what virtual machine is selected or the machine state.

I have not been able to find out the cause or usage pattern that triggers the issue. Restarting the system does not help. Unfortunately nothing is being recorded in the log file of the VirtualBox application or VM at the time the issue occurs.

I also noticed that opening the virtual machine settings window takes 7 seconds to open since VB 4.2.4.

To reproduce the problem:

  • Select any virtual machine in the VirtualBox Manager.
  • Press the Settings button in the toolbar.
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