Debian 9 virtual machine does not start in xcp-ng 8.3
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Good afternoon, I just upgraded from xcp-ng 8.1 to 8.2 and then to 8.3. I have a virtual machine running Debian 9 that stopped working. It displays grub upon startup, but when it starts loading, it pauses and immediately shuts down. I downloaded the installer, and it does exactly the same thing. I tried older versions and it works fine. It seems to be related to the 4.9.0-11 kernel version. Do you know if this is a known issue?
Regards
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Hi,
Are you in PV or HVM mode?
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How are you @olivierlambert ? He's at HVM.
uuid ( RO) : 04f4eb58-97c6-b3c0-582d-96ebf841575e name-label ( RW): PBX <(Test) name-description ( RW): user-version ( RW): 1 is-a-template ( RW): false is-default-template ( RW): false is-a-snapshot ( RO): false snapshot-of ( RO): <not in database> snapshots ( RO): 60dd299e-5627-5cae-927c-d371cf1cf858 snapshot-time ( RO): 19700101T00:00:00Z snapshot-info ( RO): parent ( RO): 60dd299e-5627-5cae-927c-d371cf1cf858 children ( RO): is-control-domain ( RO): false power-state ( RO): running memory-actual ( RO): 1073737728 memory-target ( RO): 1073741824 memory-overhead ( RO): 14680064 memory-static-max ( RW): 1073741824 memory-dynamic-max ( RW): 1073741824 memory-dynamic-min ( RW): 1073741824 memory-static-min ( RW): 134217728 suspend-VDI-uuid ( RW): <not in database> suspend-SR-uuid ( RW): <not in database> VCPUs-params (MRW): weight: 256 VCPUs-max ( RW): 4 VCPUs-at-startup ( RW): 4 actions-after-shutdown ( RW): Destroy actions-after-reboot ( RW): Restart actions-after-crash ( RW): Restart console-uuids (SRO): 80f044cf-65b5-052a-69b2-83dfaf51e9bc hvm ( RO): true platform (MRW): timeoffset: 0; device-model: qemu-upstream-compat; nx: true; acpi: 1; apic: true; pae: true; viridian: true; cores-per-socket: 1 allowed-operations (SRO): changing_dynamic_range; migrate_send; pool_migrate; changing_VCPUs_live; suspend; hard_reboot; hard_shutdown; clean_reboot; clean_shutdown; pause; checkpoint; snapshot current-operations (SRO): blocked-operations (MRW): allowed-VBD-devices (SRO): 1; 2; 4; 5; 6; 7; 8; 9; 10; 11; 12; 13; 14; 15; 16; 17; 18; 19; 20; 21; 22; 23; 24; 25; 26; 27; 28; 29; 30; 31; 32; 33; 34; 35; 36; 37; 38; 39; 40; 41; 42; 43; 44; 45; 46; 47; 48; 49; 50; 51; 52; 53; 54; 55; 56; 57; 58; 59; 60; 61; 62; 63; 64; 65; 66; 67; 68; 69; 70; 71; 72; 73; 74; 75; 76; 77; 78; 79; 80; 81; 82; 83; 84; 85; 86; 87; 88; 89; 90; 91; 92; 93; 94; 95; 96; 97; 98; 99; 100; 101; 102; 103; 104; 105; 106; 107; 108; 109; 110; 111; 112; 113; 114; 115; 116; 117; 118; 119; 120; 121; 122; 123; 124; 125; 126; 127; 128; 129; 130; 131; 132; 133; 134; 135; 136; 137; 138; 139; 140; 141; 142; 143; 144; 145; 146; 147; 148; 149; 150; 151; 152; 153; 154; 155; 156; 157; 158; 159; 160; 161; 162; 163; 164; 165; 166; 167; 168; 169; 170; 171; 172; 173; 174; 175; 176; 177; 178; 179; 180; 181; 182; 183; 184; 185; 186; 187; 188; 189; 190; 191; 192; 193; 194; 195; 196; 197; 198; 199; 200; 201; 202; 203; 204; 205; 206; 207; 208; 209; 210; 211; 212; 213; 214; 215; 216; 217; 218; 219; 220; 221; 222; 223; 224; 225; 226; 227; 228; 229; 230; 231; 232; 233; 234; 235; 236; 237; 238; 239; 240; 241; 242; 243; 244; 245; 246; 247; 248; 249; 250; 251; 252; 253; 254 allowed-VIF-devices (SRO): 1; 2; 3; 4; 5; 6 possible-hosts ( RO): 511b75ca-cea4-4831-9c13-4b81bf11f87a domain-type ( RW): hvm current-domain-type ( RO): hvm HVM-boot-policy ( RW): BIOS order HVM-boot-params (MRW): order: dc HVM-shadow-multiplier ( RW): 1.000 PV-kernel ( RW): PV-ramdisk ( RW): PV-args ( RW): PV-legacy-args ( RW): PV-bootloader ( RW): PV-bootloader-args ( RW): last-boot-CPU-flags ( RO): vendor: GenuineIntel; features: 1fcbfbff-f7ba2223-2993fbff-00000403-00000001-00000281-00000000-00000000-00001000-9c000400-00000000-00000000-00000000-00000000-00000000 last-boot-record ( RO): '' resident-on ( RO): 511b75ca-cea4-4831-9c13-4b81bf11f87a affinity ( RW): <not in database> other-config (MRW): auto_poweron: true; import_task: OpaqueRef:21e5bc93-aab0-4682-b6a4-3f7edb75e10f; mac_seed: b50c01ae-a763-6d83-f49a-08a6410ea93d; vgpu_pci: ; base_template_name: Other install media; install-methods: cdrom dom-id ( RO): 26 recommendations ( RO): <restrictions><restriction field="memory-static-max" max="137438953472" /><restriction field="vcpus-max" max="16" /><restriction property="number-of-vbds" max="7" /><restriction property="number-of-vifs" max="7" /></restrictions> xenstore-data (MRW): vm-data: ; vm-data/mmio-hole-size: 268435456 ha-always-run ( RW) [DEPRECATED]: false ha-restart-priority ( RW): blobs ( RO): start-time ( RO): 20250730T03:35:37Z install-time ( RO): 19700101T00:00:00Z VCPUs-number ( RO): 4 VCPUs-utilisation (MRO): 0: 0.013; 1: 0.013; 2: 0.006; 3: 0.014 os-version (MRO): name: Debian GNU/Linux 9.11 (stretch); uname: 4.9.0-11-amd64; distro: debian; major: 9; minor: 11 PV-drivers-version (MRO): major: 8; minor: 0; micro: 50; build: 1 PV-drivers-up-to-date ( RO) [DEPRECATED]: true memory (MRO): disks (MRO): VBDs (SRO): c41f4f9a-fdf8-cb2a-e4d0-5e42e1eb7172; f008c7c2-26de-1261-2d24-6ee93f55107a networks (MRO): 0/ipv6/0: fe80::f843:58ff:fe92:5993 PV-drivers-detected ( RO): true other (MRO): platform-feature-multiprocessor-suspend: 1; has-vendor-device: 0; feature-suspend: 1; feature-poweroff: 1; feature-reboot: 1; feature-vcpu-hotplug: 1; feature-balloon: 1 live ( RO): true guest-metrics-last-updated ( RO): 20250730T03:36:23Z can-use-hotplug-vbd ( RO): unspecified can-use-hotplug-vif ( RO): unspecified cooperative ( RO) [DEPRECATED]: true tags (SRW): restored from backup appliance ( RW): <not in database> snapshot-schedule ( RW): <not in database> is-vmss-snapshot ( RO): false start-delay ( RW): 0 shutdown-delay ( RW): 0 order ( RW): 0 version ( RO): 0 generation-id ( RO): hardware-platform-version ( RO): 0 has-vendor-device ( RW): false requires-reboot ( RO): false reference-label ( RO): bios-strings (MRO): bios-vendor: Xen; bios-version: ; system-manufacturer: Xen; system-product-name: HVM domU; system-version: ; system-serial-number: ; baseboard-manufacturer: ; baseboard-product-name: ; baseboard-version: ; baseboard-serial-number: ; baseboard-asset-tag: ; baseboard-location-in-chassis: ; enclosure-asset-tag: ; hp-rombios: ; oem-1: Xen; oem-2: MS_VM_CERT/SHA1/bdbeb6e0a816d43fa6d3fe8aaef04c2bad9d3e3d -
Update: If I change the vCPU configuration to 1 socket with 4 cores per socket the VM starts correctly
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OK so potentially a vCPU topology issue
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@mdavico Thank you, now I can de-commission xcp 8.2! I was scratching my head on this one as well. Same deal, debian 9, imported vms from xcp 8.2 into a new 8.3 and then they did not boot.
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@mdavico said in Debian 9 virtual machine does not start in xcp-ng 8.3:
Update: If I change the vCPU configuration to 1 socket with 4 cores per socket the VM starts correctly
Interesring. First time I heard it had any effect at all on a VM.
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I often wondered what's the general purpose of that option.
As I only have 1 - 2 socket servers, I always choose 1 socket with x cores (mostly 2 - 8, not exeeding 1 real CPU).
Also for historic reasons: Sockets have been limited, but not cores.Does it generally make any difference on Xen side/backend?
VM OS might handle it different due to NUMA optimizations.
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