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    VM UUID via dmidecode does not match VM ID in xen-orchestra

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    • D Offline
      dinhngtu Vates 🪐 XCP-ng Team @deefdragon
      last edited by dinhngtu

      @deefdragon All three values match for me with XCP-ng 8.3, Ubuntu 24.04 guests and kernel 6.8:

      $ sudo cat /sys/devices/virtual/dmi/id/product_serial
      adc9b6ba-d187-0844-13a6-5f1dc155bf6e
      $ sudo cat /sys/devices/virtual/dmi/id/product_uuid
      adc9b6ba-d187-0844-13a6-5f1dc155bf6e
      $ sudo cat /sys/hypervisor/uuid
      adc9b6ba-d187-0844-13a6-5f1dc155bf6e
      

      From your Github issue, it looks like a confusion in byte order between the System UUID (6a87cb0f-ca4c-ffa5-3ca2-fc398fb25eac) and the XCP-ng VM UUID (0fcb876a-4cca-a5ff-3ca2-fc398fb25eac).

      I'd check the guest kernel version first.

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      • D Offline
        deefdragon @dinhngtu
        last edited by deefdragon

        @dinhngtu

        Ah, I see the pattern now. That is bizarre.

        deef@k31-w-3bfbbe:~$ sudo cat /sys/devices/virtual/dmi/id/product_serial
        0b08f477-491a-a982-23c4-d224723624ea
        deef@k31-w-3bfbbe:~$ sudo cat /sys/devices/virtual/dmi/id/product_uuid
        77f4080b-1a49-82a9-23c4-d224723624ea
        deef@k31-w-3bfbbe:~$ sudo cat /sys/hypervisor/uuid
        0b08f477-491a-a982-23c4-d224723624ea
        

        Heres the output from a series of commands I ran to get the info of the worker. Seeing 6.8 and 24.04 myself.

        deef@k31-w-3bfbbe:~$ cat /etc/*-release
        DISTRIB_ID=Ubuntu
        DISTRIB_RELEASE=24.04
        DISTRIB_CODENAME=noble
        DISTRIB_DESCRIPTION="Ubuntu 24.04.2 LTS"
        PRETTY_NAME="Ubuntu 24.04.2 LTS"
        NAME="Ubuntu"
        VERSION_ID="24.04"
        VERSION="24.04.2 LTS (Noble Numbat)"
        VERSION_CODENAME=noble
        ID=ubuntu
        ID_LIKE=debian
        HOME_URL="https://www.ubuntu.com/"
        SUPPORT_URL="https://help.ubuntu.com/"
        BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
        PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
        UBUNTU_CODENAME=noble
        LOGO=ubuntu-logo
        
        deef@k31-w-3bfbbe:~$ lsb_release -a
        No LSB modules are available.
        Distributor ID:	Ubuntu
        Description:	Ubuntu 24.04.2 LTS
        Release:	24.04
        Codename:	noble
        
        deef@k31-w-3bfbbe:~$ hostnamectl
         Static hostname: k31-w-3bfbbe
               Icon name: computer-vm
                 Chassis: vm 🖴
              Machine ID: 9bae21fe1e10d9da92da72599fd7b4a3
                 Boot ID: 959ebf2dc51e403eaf00103d51e8397e
          Virtualization: xen
        Operating System: Ubuntu 24.04.2 LTS              
                  Kernel: Linux 6.8.0-64-generic
            Architecture: x86-64
         Hardware Vendor: Xen
          Hardware Model: HVM domU
        Firmware Version: 4.17
           Firmware Date: Tue 2025-05-13
            Firmware Age: 2month 2w 3d
        
        deef@k31-w-3bfbbe:~$ uname -r
        6.8.0-64-generic
        
        

        LMK if there is anything else you want me to throw at it, or any other debug info you want me to get. I'm out of my depth when it comes to debugging this kind of thing.

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        • D Offline
          dinhngtu Vates 🪐 XCP-ng Team @deefdragon
          last edited by

          @deefdragon How about host Xen and XAPI versions? I'm on the bleeding edge, so this may have been fixed somewhere already.

          # unbuffer yum list installed | grep xen\\\|xapi
          mellanox-mlnxen.x86_64            5.9_0.5.5.0-2.1.xcpng8.3    @xcp:main/$releasever
          python2-xapi-storage.x86_64       24.19.2-1.10.xcpng8.3       @xcp-ng-testing
          xapi-core.x86_64                  25.6.0-1.10.xcpng8.3        @xcp-ng-incoming
          xapi-nbd.x86_64                   25.6.0-1.10.xcpng8.3        @xcp-ng-incoming
          xapi-rrd2csv.x86_64               25.6.0-1.10.xcpng8.3        @xcp-ng-incoming
          xapi-storage-script.x86_64        25.6.0-1.10.xcpng8.3        @xcp-ng-incoming
          xapi-tests.x86_64                 25.6.0-1.10.xcpng8.3        @xcp-ng-incoming
          xapi-xe.x86_64                    25.6.0-1.10.xcpng8.3        @xcp-ng-incoming
          xcp-ng-xapi-plugins.noarch        1.12.0-1.xcpng8.3           @xcp-ng-testing
          xen-crashdump-analyser.x86_64     2.6.1-1.xcpng8.3            @xcp:main/$releasever
          xen-dom0-libs.x86_64              4.17.5-15.2.xcpng8.3        @xcp-ng-incoming
          xen-dom0-tools.x86_64             4.17.5-15.2.xcpng8.3        @xcp-ng-incoming
          xen-hypervisor.x86_64             4.17.5-15.2.xcpng8.3        @xcp-ng-incoming
          xen-libs.x86_64                   4.17.5-15.2.xcpng8.3        @xcp-ng-incoming
          xen-tools.x86_64                  4.17.5-15.2.xcpng8.3        @xcp-ng-incoming
          xengt-userspace.noarch            4.0.0-1.xcpng8.3            @xcp:main/$releasever
          xenopsd.x86_64                    25.6.0-1.10.xcpng8.3        @xcp-ng-incoming
          xenopsd-cli.x86_64                25.6.0-1.10.xcpng8.3        @xcp-ng-incoming
          xenopsd-xc.x86_64                 25.6.0-1.10.xcpng8.3        @xcp-ng-incoming
          xenserver-dracut.noarch           10-2.xcpng8.3               @xcp:main/$releasever
          xenserver-hwdata.noarch           20240411-1.xcpng8.3         @xcp:main/$releasever
          xenserver-status-report.noarch    2.0.11-1.xcpng8.3           @xcp-ng-ci
          
          D 1 Reply Last reply Reply Quote 0
          • D Offline
            deefdragon @dinhngtu
            last edited by

            @dinhngtu

            Only difference looks to be xen-dom0 etc. on 4.17.5-13.1.xcpng8.3 vs your 4.17.5-15.2.xcpng8.3

            # unbuffer yum list installed | grep xen\\\|xapi
            mellanox-mlnxen.x86_64                   5.9_0.5.5.0-2.1.xcpng8.3         @xcp:main/$releasever
            python2-xapi-storage.x86_64              24.19.2-1.10.xcpng8.3            @xcp-ng-updates      
            xapi-core.x86_64                         25.6.0-1.5.xcpng8.3              @xcp-ng-updates      
            xapi-nbd.x86_64                          25.6.0-1.5.xcpng8.3              @xcp-ng-updates      
            xapi-rrd2csv.x86_64                      25.6.0-1.5.xcpng8.3              @xcp-ng-updates      
            xapi-storage-script.x86_64               25.6.0-1.5.xcpng8.3              @xcp-ng-updates      
            xapi-tests.x86_64                        25.6.0-1.5.xcpng8.3              @xcp-ng-updates      
            xapi-xe.x86_64                           25.6.0-1.5.xcpng8.3              @xcp-ng-updates      
            xcp-ng-xapi-plugins.noarch               1.12.0-1.xcpng8.3                @xcp-ng-updates      
            xen-crashdump-analyser.x86_64            2.6.1-1.xcpng8.3                 @xcp:main/$releasever
            xen-dom0-libs.x86_64                     4.17.5-13.1.xcpng8.3             @xcp-ng-updates      
            xen-dom0-tools.x86_64                    4.17.5-13.1.xcpng8.3             @xcp-ng-updates      
            xen-hypervisor.x86_64                    4.17.5-13.1.xcpng8.3             @xcp-ng-updates      
            xen-libs.x86_64                          4.17.5-13.1.xcpng8.3             @xcp-ng-updates      
            xen-tools.x86_64                         4.17.5-13.1.xcpng8.3             @xcp-ng-updates      
            xengt-userspace.noarch                   4.0.0-1.xcpng8.3                 @xcp:main/$releasever
            xenopsd.x86_64                           25.6.0-1.5.xcpng8.3              @xcp-ng-updates      
            xenopsd-cli.x86_64                       25.6.0-1.5.xcpng8.3              @xcp-ng-updates      
            xenopsd-xc.x86_64                        25.6.0-1.5.xcpng8.3              @xcp-ng-updates      
            xenserver-dracut.noarch                  10-2.xcpng8.3                    @xcp:main/$releasever
            xenserver-hwdata.noarch                  20240411-1.xcpng8.3              @xcp:main/$releasever
            xenserver-status-report.noarch           2.0.11-1.xcpng8.3                @xcp-ng-updates      
            
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            • D Offline
              dinhngtu Vates 🪐 XCP-ng Team @deefdragon
              last edited by

              @deefdragon Your XAPI is also lagging behind (25.6.0-1.5 vs latest 25.6.0-1.9). Could you update your pool?

              D 1 Reply Last reply Reply Quote 0
              • TeddyAstieT Online
                TeddyAstie Vates 🪐 XCP-ng Team Xen Guru
                last edited by

                deef@k31-w-3bfbbe:~$ sudo cat /sys/devices/virtual/dmi/id/product_serial
                0b08f477-491a-a982-23c4-d224723624ea
                deef@k31-w-3bfbbe:~$ sudo cat /sys/devices/virtual/dmi/id/product_uuid
                77f4080b-1a49-82a9-23c4-d224723624ea
                deef@k31-w-3bfbbe:~$ sudo cat /sys/hypervisor/uuid
                0b08f477-491a-a982-23c4-d224723624ea
                

                It looks like a endianness issue (0b08f477 vs 77f4080b).

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                • TeddyAstieT Online
                  TeddyAstie Vates 🪐 XCP-ng Team Xen Guru
                  last edited by

                  @deefdragon can you provide us the output of dmidecode in the guest ?

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                  • D Offline
                    deefdragon @dinhngtu
                    last edited by

                    @dinhngtu Updated through xo. These are the current values.

                    mellanox-mlnxen.x86_64               5.9_0.5.5.0-2.1.xcpng8.3       @xcp:main/$releasever
                    python2-xapi-storage.x86_64          24.19.2-1.10.xcpng8.3          @xcp-ng-updates      
                    xapi-core.x86_64                     25.6.0-1.9.xcpng8.3            @xcp-ng-updates      
                    xapi-nbd.x86_64                      25.6.0-1.9.xcpng8.3            @xcp-ng-updates      
                    xapi-rrd2csv.x86_64                  25.6.0-1.9.xcpng8.3            @xcp-ng-updates      
                    xapi-storage-script.x86_64           25.6.0-1.9.xcpng8.3            @xcp-ng-updates      
                    xapi-tests.x86_64                    25.6.0-1.9.xcpng8.3            @xcp-ng-updates      
                    xapi-xe.x86_64                       25.6.0-1.9.xcpng8.3            @xcp-ng-updates      
                    xcp-ng-xapi-plugins.noarch           1.12.0-1.xcpng8.3              @xcp-ng-updates      
                    xen-crashdump-analyser.x86_64        2.6.1-1.xcpng8.3               @xcp:main/$releasever
                    xen-dom0-libs.x86_64                 4.17.5-15.1.xcpng8.3           @xcp-ng-updates      
                    xen-dom0-tools.x86_64                4.17.5-15.1.xcpng8.3           @xcp-ng-updates      
                    xen-hypervisor.x86_64                4.17.5-15.1.xcpng8.3           @xcp-ng-updates      
                    xen-libs.x86_64                      4.17.5-15.1.xcpng8.3           @xcp-ng-updates      
                    xen-tools.x86_64                     4.17.5-15.1.xcpng8.3           @xcp-ng-updates      
                    xengt-userspace.noarch               4.0.0-1.xcpng8.3               @xcp:main/$releasever
                    xenopsd.x86_64                       25.6.0-1.9.xcpng8.3            @xcp-ng-updates      
                    xenopsd-cli.x86_64                   25.6.0-1.9.xcpng8.3            @xcp-ng-updates      
                    xenopsd-xc.x86_64                    25.6.0-1.9.xcpng8.3            @xcp-ng-updates      
                    xenserver-dracut.noarch              10-2.xcpng8.3                  @xcp:main/$releasever
                    xenserver-hwdata.noarch              20240411-1.xcpng8.3            @xcp:main/$releasever
                    xenserver-status-report.noarch       2.0.11-1.xcpng8.3              @xcp-ng-updates      
                    
                    

                    Gave one of the VMs a reboot and got the same result as previous.

                    Full DMI Decode as requested @TeddyAstie

                    # dmidecode
                    # dmidecode 3.5
                    Getting SMBIOS data from sysfs.
                    SMBIOS 2.8 present.
                    19 structures occupying 691 bytes.
                    Table at 0xEE6FC000.
                    
                    Handle 0x0000, DMI type 0, 24 bytes
                    BIOS Information
                    	Vendor: Xen
                    	Version: 4.17
                    	Release Date: 07/10/2025
                    	Address: 0xE8000
                    	Runtime Size: 96 kB
                    	ROM Size: 64 kB
                    	Characteristics:
                    		PCI is supported
                    		EDD is supported
                    		Targeted content distribution is supported
                    	BIOS Revision: 4.17
                    
                    Handle 0x0100, DMI type 1, 27 bytes
                    System Information
                    	Manufacturer: Xen
                    	Product Name: HVM domU
                    	Version: 4.17
                    	Serial Number: 0b08f477-491a-a982-23c4-d224723624ea
                    	UUID: 77f4080b-1a49-82a9-23c4-d224723624ea
                    	Wake-up Type: Power Switch
                    	SKU Number: Not Specified
                    	Family: Not Specified
                    
                    Handle 0x0300, DMI type 3, 21 bytes
                    Chassis Information
                    	Manufacturer: Xen
                    	Type: Other
                    	Lock: Not Present
                    	Version: Not Specified
                    	Serial Number: Not Specified
                    	Asset Tag: Not Specified
                    	Boot-up State: Safe
                    	Power Supply State: Safe
                    	Thermal State: Safe
                    	Security Status: Unknown
                    	OEM Information: 0x00000000
                    	Height: Unspecified
                    	Number Of Power Cords: Unspecified
                    	Contained Elements: 0
                    
                    Handle 0x0401, DMI type 4, 35 bytes
                    Processor Information
                    	Socket Designation: CPU 1
                    	Type: Central Processor
                    	Family: Other
                    	Manufacturer: Intel
                    	ID: F1 06 04 00 FF FB CB 0F
                    	Version: Not Specified
                    	Voltage: Unknown
                    	External Clock: Unknown
                    	Max Speed: 2100 MHz
                    	Current Speed: 2100 MHz
                    	Status: Populated, Enabled
                    	Upgrade: Other
                    	L1 Cache Handle: Not Provided
                    	L2 Cache Handle: Not Provided
                    	L3 Cache Handle: Not Provided
                    	Serial Number: Not Specified
                    	Asset Tag: Not Specified
                    	Part Number: Not Specified
                    
                    Handle 0x0402, DMI type 4, 35 bytes
                    Processor Information
                    	Socket Designation: CPU 2
                    	Type: Central Processor
                    	Family: Other
                    	Manufacturer: Intel
                    	ID: F1 06 04 00 FF FB CB 0F
                    	Version: Not Specified
                    	Voltage: Unknown
                    	External Clock: Unknown
                    	Max Speed: 2100 MHz
                    	Current Speed: 2100 MHz
                    	Status: Populated, Enabled
                    	Upgrade: Other
                    	L1 Cache Handle: Not Provided
                    	L2 Cache Handle: Not Provided
                    	L3 Cache Handle: Not Provided
                    	Serial Number: Not Specified
                    	Asset Tag: Not Specified
                    	Part Number: Not Specified
                    
                    Handle 0x0403, DMI type 4, 35 bytes
                    Processor Information
                    	Socket Designation: CPU 3
                    	Type: Central Processor
                    	Family: Other
                    	Manufacturer: Intel
                    	ID: F1 06 04 00 FF FB CB 0F
                    	Version: Not Specified
                    	Voltage: Unknown
                    	External Clock: Unknown
                    	Max Speed: 2100 MHz
                    	Current Speed: 2100 MHz
                    	Status: Populated, Enabled
                    	Upgrade: Other
                    	L1 Cache Handle: Not Provided
                    	L2 Cache Handle: Not Provided
                    	L3 Cache Handle: Not Provided
                    	Serial Number: Not Specified
                    	Asset Tag: Not Specified
                    	Part Number: Not Specified
                    
                    Handle 0x0404, DMI type 4, 35 bytes
                    Processor Information
                    	Socket Designation: CPU 4
                    	Type: Central Processor
                    	Family: Other
                    	Manufacturer: Intel
                    	ID: F1 06 04 00 FF FB CB 0F
                    	Version: Not Specified
                    	Voltage: Unknown
                    	External Clock: Unknown
                    	Max Speed: 2100 MHz
                    	Current Speed: 2100 MHz
                    	Status: Populated, Enabled
                    	Upgrade: Other
                    	L1 Cache Handle: Not Provided
                    	L2 Cache Handle: Not Provided
                    	L3 Cache Handle: Not Provided
                    	Serial Number: Not Specified
                    	Asset Tag: Not Specified
                    	Part Number: Not Specified
                    
                    Handle 0x0405, DMI type 4, 35 bytes
                    Processor Information
                    	Socket Designation: CPU 5
                    	Type: Central Processor
                    	Family: Other
                    	Manufacturer: Intel
                    	ID: F1 06 04 00 FF FB CB 0F
                    	Version: Not Specified
                    	Voltage: Unknown
                    	External Clock: Unknown
                    	Max Speed: 2100 MHz
                    	Current Speed: 2100 MHz
                    	Status: Populated, Enabled
                    	Upgrade: Other
                    	L1 Cache Handle: Not Provided
                    	L2 Cache Handle: Not Provided
                    	L3 Cache Handle: Not Provided
                    	Serial Number: Not Specified
                    	Asset Tag: Not Specified
                    	Part Number: Not Specified
                    
                    Handle 0x0406, DMI type 4, 35 bytes
                    Processor Information
                    	Socket Designation: CPU 6
                    	Type: Central Processor
                    	Family: Other
                    	Manufacturer: Intel
                    	ID: F1 06 04 00 FF FB CB 0F
                    	Version: Not Specified
                    	Voltage: Unknown
                    	External Clock: Unknown
                    	Max Speed: 2100 MHz
                    	Current Speed: 2100 MHz
                    	Status: Populated, Enabled
                    	Upgrade: Other
                    	L1 Cache Handle: Not Provided
                    	L2 Cache Handle: Not Provided
                    	L3 Cache Handle: Not Provided
                    	Serial Number: Not Specified
                    	Asset Tag: Not Specified
                    	Part Number: Not Specified
                    
                    Handle 0x0B00, DMI type 11, 5 bytes
                    OEM Strings
                    	String 1: Xen
                    	String 2: MS_VM_CERT/SHA1/bdbeb6e0a816d43fa6d3fe8aaef04c2bad9d3e3d
                    
                    Handle 0x1000, DMI type 16, 15 bytes
                    Physical Memory Array
                    	Location: Other
                    	Use: System Memory
                    	Error Correction Type: Multi-bit ECC
                    	Maximum Capacity: 24568 MB
                    	Error Information Handle: Not Provided
                    	Number Of Devices: 2
                    
                    Handle 0x1100, DMI type 17, 27 bytes
                    Memory Device
                    	Array Handle: 0x1000
                    	Error Information Handle: 0x0000
                    	Total Width: 64 bits
                    	Data Width: 64 bits
                    	Size: 16 GB
                    	Form Factor: DIMM
                    	Set: None
                    	Locator: DIMM 0
                    	Bank Locator: Not Specified
                    	Type: RAM
                    	Type Detail: None
                    	Speed: Unknown
                    	Manufacturer: Not Specified
                    	Serial Number: Not Specified
                    	Asset Tag: Not Specified
                    	Part Number: Not Specified
                    
                    Handle 0x1300, DMI type 19, 15 bytes
                    Memory Array Mapped Address
                    	Starting Address: 0x00000000000
                    	Ending Address: 0x003FFFFFFFF
                    	Range Size: 16 GB
                    	Physical Array Handle: 0x1000
                    	Partition Width: 1
                    
                    Handle 0x1400, DMI type 20, 19 bytes
                    Memory Device Mapped Address
                    	Starting Address: 0x00000000000
                    	Ending Address: 0x003FFFFFFFF
                    	Range Size: 16 GB
                    	Physical Device Handle: 0x1100
                    	Memory Array Mapped Address Handle: 0x1300
                    	Partition Row Position: 1
                    
                    Handle 0x1101, DMI type 17, 27 bytes
                    Memory Device
                    	Array Handle: 0x1000
                    	Error Information Handle: 0x0000
                    	Total Width: 64 bits
                    	Data Width: 64 bits
                    	Size: 8184 MB
                    	Form Factor: DIMM
                    	Set: None
                    	Locator: DIMM 1
                    	Bank Locator: Not Specified
                    	Type: RAM
                    	Type Detail: None
                    	Speed: Unknown
                    	Manufacturer: Not Specified
                    	Serial Number: Not Specified
                    	Asset Tag: Not Specified
                    	Part Number: Not Specified
                    
                    Handle 0x1301, DMI type 19, 15 bytes
                    Memory Array Mapped Address
                    	Starting Address: 0x00400000000
                    	Ending Address: 0x005FF7FFFFF
                    	Range Size: 8184 MB
                    	Physical Array Handle: 0x1000
                    	Partition Width: 1
                    
                    Handle 0x1401, DMI type 20, 19 bytes
                    Memory Device Mapped Address
                    	Starting Address: 0x00400000000
                    	Ending Address: 0x005FF7FFFFF
                    	Range Size: 8184 MB
                    	Physical Device Handle: 0x1101
                    	Memory Array Mapped Address Handle: 0x1301
                    	Partition Row Position: 1
                    
                    Handle 0x2000, DMI type 32, 11 bytes
                    System Boot Information
                    	Status: No errors detected
                    
                    Handle 0xFEFF, DMI type 127, 4 bytes
                    End Of Table
                    
                    
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                    • D Offline
                      deefdragon
                      last edited by

                      Out of curiosity, I dumped the DMI into a bin and opened it up in a hex editor.

                      I am seeing ASCII of the ID, but also a variant encoded in binary. In both cases, its formatted as 0b08f477-491a-a982-23c4-d224723624ea.

                      I believe the ASCII version is the one that gets populated into the serial number as it comes after ASCII encoded versions of the 3 lines above it in the decode.

                      TeddyAstieT 1 Reply Last reply Reply Quote 0
                      • TeddyAstieT Online
                        TeddyAstie Vates 🪐 XCP-ng Team Xen Guru @deefdragon
                        last edited by TeddyAstie

                        @deefdragon said in VM UUID via dmidecode does not match VM ID in xen-orchestra:

                        Out of curiosity, I dumped the DMI into a bin and opened it up in a hex editor.

                        I am seeing ASCII of the ID, but also a variant encoded in binary. In both cases, its formatted as 0b08f477-491a-a982-23c4-d224723624ea.

                        I believe the ASCII version is the one that gets populated into the serial number as it comes after ASCII encoded versions of the 3 lines above it in the decode.

                        In SMBIOS 2.8, the UUID is supposed to be encoded in little endian (i.e Microsoft GUID). Yet it is put as big endian instead. So when Linux generates the UUID string from the SMBIOS table, it is considered as little endian which causes this mismatch.

                        SMBIOS 2.4 is supposed to be used (which appears to be using big endian UUIDs), but for some reason, something in XCP-ng UEFI supports forces it to be SMBIOS 2.8.

                        So the binary UUID is the same, just that it is interpreted with a different endianness due to accidental format change.

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