The disco story is not so pretty:

[    0.000000] Linux version 5.0.0-34-generic (buildd@lgw01-amd64-051) (gcc 
version 7.4.0 (Ubuntu 7.4.0-1ubuntu1~18.04.1)) #36~18.04.1-Ubuntu SMP Wed Oct 
30 08:08:56 UTC 2019 (Ubuntu 5.0.0-34.36~18.04.1-generic 5.0.21)
[    0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-5.0.0-34-generic 
root=UUID=e3626652-82d8-4e95-a6d7-e4920d7941b6 ro console=tty1 console=ttyS0
[    0.000000] KERNEL supported cpus:
[    0.000000]   Intel GenuineIntel
[    0.000000]   AMD AuthenticAMD
[    0.000000]   Hygon HygonGenuine
[    0.000000]   Centaur CentaurHauls
[    0.000000] x86/fpu: Supporting XSAVE feature 0x001: 'x87 floating point 
registers'
[    0.000000] x86/fpu: Supporting XSAVE feature 0x002: 'SSE registers'
[    0.000000] x86/fpu: Supporting XSAVE feature 0x004: 'AVX registers'
[    0.000000] x86/fpu: xstate_offset[2]:  576, xstate_sizes[2]:  256
[    0.000000] x86/fpu: Enabled xstate features 0x7, context size is 832 bytes, 
using 'standard' format.
[    0.000000] BIOS-provided physical RAM map:
[    0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009fbff] usable
[    0.000000] BIOS-e820: [mem 0x000000000009fc00-0x000000000009ffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000000f0000-0x00000000000fffff] reserved
[    0.000000] BIOS-e820: [mem 0x0000000000100000-0x000000001ffd7fff] usable
[    0.000000] BIOS-e820: [mem 0x000000001ffd8000-0x000000001fffffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000feffc000-0x00000000feffffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000fffc0000-0x00000000ffffffff] reserved
[    0.000000] NX (Execute Disable) protection: active
[    0.000000] SMBIOS 2.8 present.
[    0.000000] DMI: OpenStack Foundation OpenStack Nova, BIOS 1.10.2-1ubuntu1 
04/01/2014
[    0.000000] Hypervisor detected: KVM
[    0.000000] kvm-clock: Using msrs 4b564d01 and 4b564d00
[    0.000000] kvm-clock: cpu 0, msr e601001, primary cpu clock
[    0.000000] kvm-clock: using sched offset of 79214193145 cycles
[    0.000002] clocksource: kvm-clock: mask: 0xffffffffffffffff max_cycles: 
0x1cd42e4dffb, max_idle_ns: 881590591483 ns
[    0.000004] tsc: Detected 2298.666 MHz processor
[    0.002336] last_pfn = 0x1ffd8 max_arch_pfn = 0x400000000
[    0.002446] x86/PAT: Configuration [0-7]: WB  WC  UC- UC  WB  WP  UC- WT  
[    0.008265] found SMP MP-table at [mem 0x000f6a60-0x000f6a6f]
[    0.008362] check: Scanning 1 areas for low memory corruption
[    0.008413] Using GB pages for direct mapping
[    0.008561] RAMDISK: [mem 0x1d8fb000-0x1ecacfff]
[    0.008579] ACPI: Early table checksum verification disabled
[    0.008637] ACPI: RSDP 0x00000000000F6860 000014 (v00 BOCHS )
[    0.008640] ACPI: RSDT 0x000000001FFE1505 00002C (v01 BOCHS  BXPCRSDT 
00000001 BXPC 00000001)
[    0.008646] ACPI: FACP 0x000000001FFE1419 000074 (v01 BOCHS  BXPCFACP 
00000001 BXPC 00000001)
[    0.008654] ACPI: DSDT 0x000000001FFE0040 0013D9 (v01 BOCHS  BXPCDSDT 
00000001 BXPC 00000001)
[    0.008657] ACPI: FACS 0x000000001FFE0000 000040
[    0.008660] ACPI: APIC 0x000000001FFE148D 000078 (v01 BOCHS  BXPCAPIC 
00000001 BXPC 00000001)
[    0.009155] No NUMA configuration found
[    0.009157] Faking a node at [mem 0x0000000000000000-0x000000001ffd7fff]
[    0.009167] NODE_DATA(0) allocated [mem 0x1ffad000-0x1ffd7fff]
[    0.009417] Zone ranges:
[    0.009418]   DMA      [mem 0x0000000000001000-0x0000000000ffffff]
[    0.009420]   DMA32    [mem 0x0000000001000000-0x000000001ffd7fff]
[    0.009421]   Normal   empty
[    0.009422]   Device   empty
[    0.009423] Movable zone start for each node
[    0.009427] Early memory node ranges
[    0.009428]   node   0: [mem 0x0000000000001000-0x000000000009efff]
[    0.009429]   node   0: [mem 0x0000000000100000-0x000000001ffd7fff]
[    0.009433] Zeroed struct page in unavailable ranges: 98 pages
[    0.009434] Initmem setup node 0 [mem 0x0000000000001000-0x000000001ffd7fff]
[    0.013701] ACPI: PM-Timer IO Port: 0x608
[    0.013719] ACPI: LAPIC_NMI (acpi_id[0xff] dfl dfl lint[0x1])
[    0.013776] IOAPIC[0]: apic_id 0, version 17, address 0xfec00000, GSI 0-23
[    0.013778] ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl)
[    0.013780] ACPI: INT_SRC_OVR (bus 0 bus_irq 5 global_irq 5 high level)
[    0.013781] ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level)
[    0.013783] ACPI: INT_SRC_OVR (bus 0 bus_irq 10 global_irq 10 high level)
[    0.013784] ACPI: INT_SRC_OVR (bus 0 bus_irq 11 global_irq 11 high level)
[    0.013789] Using ACPI (MADT) for SMP configuration information
[    0.013792] smpboot: Allowing 1 CPUs, 0 hotplug CPUs
[    0.013814] PM: Registered nosave memory: [mem 0x00000000-0x00000fff]
[    0.013815] PM: Registered nosave memory: [mem 0x0009f000-0x0009ffff]
[    0.013816] PM: Registered nosave memory: [mem 0x000a0000-0x000effff]
[    0.013817] PM: Registered nosave memory: [mem 0x000f0000-0x000fffff]
[    0.013819] [mem 0x20000000-0xfeffbfff] available for PCI devices
[    0.013820] Booting paravirtualized kernel on KVM
[    0.013822] clocksource: refined-jiffies: mask: 0xffffffff max_cycles: 
0xffffffff, max_idle_ns: 7645519600211568 ns
[    0.013832] random: get_random_bytes called from start_kernel+0x97/0x516 
with crng_init=0
[    0.013837] setup_percpu: NR_CPUS:8192 nr_cpumask_bits:1 nr_cpu_ids:1 
nr_node_ids:1
[    0.014182] percpu: Embedded 46 pages/cpu s151552 r8192 d28672 u2097152
[    0.014213] KVM setup async PF for cpu 0
[    0.014222] kvm-stealtime: cpu 0, msr 1f224040
[    0.014228] Built 1 zonelists, mobility grouping on.  Total pages: 128865
[    0.014229] Policy zone: DMA32
[    0.014230] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-5.0.0-34-generic 
root=UUID=e3626652-82d8-4e95-a6d7-e4920d7941b6 ro console=tty1 console=ttyS0
[    0.015456] Memory: 461708K/523736K available (14339K kernel code, 2336K 
rwdata, 4416K rodata, 2588K init, 5192K bss, 62028K reserved, 0K cma-reserved)
[    0.015587] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[    0.015600] Kernel/User page tables isolation: enabled
[    0.015621] ftrace: allocating 41677 entries in 163 pages
[    0.035100] rcu: Hierarchical RCU implementation.
[    0.035103] rcu:     RCU restricting CPUs from NR_CPUS=8192 to nr_cpu_ids=1.
[    0.035104]  Tasks RCU enabled.
[    0.035105] rcu: RCU calculated value of scheduler-enlistment delay is 25 
jiffies.
[    0.035106] rcu: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=1
[    0.038034] NR_IRQS: 524544, nr_irqs: 256, preallocated irqs: 16
[    0.054327] Console: colour VGA+ 80x25
[    0.104181] printk: console [tty1] enabled
[    0.279769] printk: console [ttyS0] enabled
[    0.281004] ACPI: Core revision 20181213
[    0.282258] APIC: Switch to symmetric I/O mode setup
[    0.284030] x2apic enabled
[    0.285340] Switched APIC routing to physical x2apic.
[    0.290787] ..TIMER: vector=0x30 apic1=0 pin1=2 apic2=-1 pin2=-1
[    0.292501] clocksource: tsc-early: mask: 0xffffffffffffffff max_cycles: 
0x212248ec3b8, max_idle_ns: 440795232693 ns
[    0.295273] Calibrating delay loop (skipped) preset value.. 4597.33 BogoMIPS 
(lpj=9194664)
[    0.297496] pid_max: default: 32768 minimum: 301
[    0.299304] LSM: Security Framework initializing
[    0.300611] Yama: becoming mindful.
[    0.301682] AppArmor: AppArmor initialized
[    0.303375] Dentry cache hash table entries: 65536 (order: 7, 524288 bytes)
[    0.305272] Inode-cache hash table entries: 32768 (order: 6, 262144 bytes)
[    0.307275] Mount-cache hash table entries: 1024 (order: 1, 8192 bytes)
[    0.309026] Mountpoint-cache hash table entries: 1024 (order: 1, 8192 bytes)
[    0.311389] Last level iTLB entries: 4KB 0, 2MB 0, 4MB 0
[    0.312848] Last level dTLB entries: 4KB 0, 2MB 0, 4MB 0, 1GB 0
[    0.314465] Spectre V1 : Mitigation: usercopy/swapgs barriers and __user 
pointer sanitization
[    0.315263] Spectre V2 : Mitigation: Full generic retpoline
[    0.319264] Spectre V2 : Spectre v2 / SpectreRSB mitigation: Filling RSB on 
context switch
[    0.321601] Spectre V2 : Enabling Restricted Speculation for firmware calls
[    0.323272] Spectre V2 : mitigation: Enabling conditional Indirect Branch 
Prediction Barrier
[    0.325666] Speculative Store Bypass: Mitigation: Speculative Store Bypass 
disabled via prctl and seccomp
[    0.327290] MDS: Mitigation: Clear CPU buffers
[    0.340984] Freeing SMP alternatives memory: 36K
[    0.344480] smpboot: CPU0: Intel Core Processor (Haswell, no TSX, IBRS) 
(family: 0x6, model: 0x3c, stepping: 0x1)
[    0.347260] Performance Events: unsupported p6 CPU model 60 no PMU driver, 
software events only.
[    0.347316] rcu: Hierarchical SRCU implementation.
[    0.349519] random: crng done (trusting CPU's manufacturer)
[    0.351112] NMI watchdog: Perf NMI watchdog permanently disabled
[    0.351301] smp: Bringing up secondary CPUs ...
[    0.352591] smp: Brought up 1 node, 1 CPU
[    0.353759] smpboot: Max logical packages: 1
[    0.354976] smpboot: Total of 1 processors activated (4597.33 BogoMIPS)
[    0.355496] devtmpfs: initialized
[    0.356568] x86/mm: Memory block size: 128MB
[    0.358114] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, 
max_idle_ns: 7645041785100000 ns
[    0.359277] futex hash table entries: 256 (order: 2, 16384 bytes)
[    0.360986] pinctrl core: initialized pinctrl subsystem
[    0.362650] RTC time: 17:28:43, date: 2019-11-08
[    0.363408] NET: Registered protocol family 16
[    0.364798] audit: initializing netlink subsys (disabled)
[    0.366432] EISA bus registered
[    0.367273] cpuidle: using governor ladder
[    0.368468] cpuidle: using governor menu
[    0.369668] ACPI: bus type PCI registered
[    0.371268] acpiphp: ACPI Hot Plug PCI Controller Driver version: 0.5
[    0.373021] audit: type=2000 audit(1573234122.330:1): state=initialized 
audit_enabled=0 res=1
[    0.375454] PCI: Using configuration type 1 for base access
[    0.378239] HugeTLB registered 1.00 GiB page size, pre-allocated 0 pages
[    0.379269] HugeTLB registered 2.00 MiB page size, pre-allocated 0 pages
[    0.381313] ACPI: Added _OSI(Module Device)
[    0.382537] ACPI: Added _OSI(Processor Device)
[    0.383271] ACPI: Added _OSI(3.0 _SCP Extensions)
[    0.384587] ACPI: Added _OSI(Processor Aggregator Device)
[    0.386101] ACPI: Added _OSI(Linux-Dell-Video)
[    0.387290] ACPI: Added _OSI(Linux-Lenovo-NV-HDMI-Audio)
[    0.388779] ACPI: Added _OSI(Linux-HPI-Hybrid-Graphics)
[    0.391298] ACPI: 1 ACPI AML tables successfully acquired and loaded
[    0.393726] ACPI: Interpreter enabled
[    0.394837] ACPI: (supports S0 S3 S4 S5)
[    0.395267] ACPI: Using IOAPIC for interrupt routing
[    0.396679] PCI: Using host bridge windows from ACPI; if necessary, use 
"pci=nocrs" and report a bug
[    0.399581] ACPI: Enabled 2 GPEs in block 00 to 0F
[    0.407164] ACPI: PCI Root Bridge [PCI0] (domain 0000 [bus 00-ff])
[    0.407281] acpi PNP0A03:00: _OSC: OS supports [ASPM ClockPM Segments MSI]
[    0.410557] acpi PNP0A03:00: fail to add MMCONFIG information, can't access 
extended PCI configuration space under this bridge.
[    0.411636] acpiphp: Slot [3] registered
[    0.412851] acpiphp: Slot [4] registered
[    0.414046] acpiphp: Slot [5] registered
[    0.415237] acpiphp: Slot [6] registered
[    0.415292] acpiphp: Slot [7] registered
[    0.416506] acpiphp: Slot [8] registered
[    0.417677] acpiphp: Slot [9] registered
[    0.418848] acpiphp: Slot [10] registered
[    0.419291] acpiphp: Slot [11] registered
[    0.420492] acpiphp: Slot [12] registered
[    0.423306] acpiphp: Slot [13] registered
[    0.424589] acpiphp: Slot [14] registered
[    0.425781] acpiphp: Slot [15] registered
[    0.426988] acpiphp: Slot [16] registered
[    0.427292] acpiphp: Slot [17] registered
[    0.428486] acpiphp: Slot [18] registered
[    0.429722] acpiphp: Slot [19] registered
[    0.430908] acpiphp: Slot [20] registered
[    0.431291] acpiphp: Slot [21] registered
[    0.432467] acpiphp: Slot [22] registered
[    0.433677] acpiphp: Slot [23] registered
[    0.434893] acpiphp: Slot [24] registered
[    0.435292] acpiphp: Slot [25] registered
[    0.436510] acpiphp: Slot [26] registered
[    0.437717] acpiphp: Slot [27] registered
[    0.438922] acpiphp: Slot [28] registered
[    0.439292] acpiphp: Slot [29] registered
[    0.440504] acpiphp: Slot [30] registered
[    0.441694] acpiphp: Slot [31] registered
[    0.442887] PCI host bridge to bus 0000:00
[    0.443269] pci_bus 0000:00: root bus resource [io  0x0000-0x0cf7 window]
[    0.445095] pci_bus 0000:00: root bus resource [io  0x0d00-0xffff window]
[    0.446916] pci_bus 0000:00: root bus resource [mem 0x000a0000-0x000bffff 
window]
[    0.447267] pci_bus 0000:00: root bus resource [mem 0x20000000-0xfebfffff 
window]
[    0.449330] pci_bus 0000:00: root bus resource [mem 0x100000000-0x17fffffff 
window]
[    0.451266] pci_bus 0000:00: root bus resource [bus 00-ff]
[    0.460086] pci 0000:00:01.1: legacy IDE quirk: reg 0x10: [io  0x01f0-0x01f7]
[    0.462003] pci 0000:00:01.1: legacy IDE quirk: reg 0x14: [io  0x03f6]
[    0.463266] pci 0000:00:01.1: legacy IDE quirk: reg 0x18: [io  0x0170-0x0177]
[    0.465406] pci 0000:00:01.1: legacy IDE quirk: reg 0x1c: [io  0x0376]
[    0.472694] pci 0000:00:01.3: quirk: [io  0x0600-0x063f] claimed by PIIX4 
ACPI
[    0.475285] pci 0000:00:01.3: quirk: [io  0x0700-0x070f] claimed by PIIX4 SMB
[    0.590571] ACPI: PCI Interrupt Link [LNKA] (IRQs 5 *10 11)
[    0.591444] ACPI: PCI Interrupt Link [LNKB] (IRQs 5 *10 11)
[    0.593182] ACPI: PCI Interrupt Link [LNKC] (IRQs 5 10 *11)
[    0.594863] ACPI: PCI Interrupt Link [LNKD] (IRQs 5 10 *11)
[    0.595347] ACPI: PCI Interrupt Link [LNKS] (IRQs *9)
[    0.597229] SCSI subsystem initialized
[    0.598531] pci 0000:00:02.0: vgaarb: setting as boot VGA device
[    0.599260] pci 0000:00:02.0: vgaarb: VGA device added: 
decodes=io+mem,owns=io+mem,locks=none
[    0.599272] pci 0000:00:02.0: vgaarb: bridge control possible
[    0.601495] vgaarb: loaded
[    0.602399] ACPI: bus type USB registered
[    0.603293] usbcore: registered new interface driver usbfs
[    0.607287] usbcore: registered new interface driver hub
[    0.608783] usbcore: registered new device driver usb
[    0.610210] pps_core: LinuxPPS API ver. 1 registered
[    0.611266] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo 
Giometti <giome...@linux.it>
[    0.613745] PTP clock support registered
[    0.614940] EDAC MC: Ver: 3.0.0
[    0.615729] PCI: Using ACPI for IRQ routing
[    0.617484] NetLabel: Initializing
[    0.618523] NetLabel:  domain hash size = 128
[    0.619266] NetLabel:  protocols = UNLABELED CIPSOv4 CALIPSO
[    0.620835] NetLabel:  unlabeled traffic allowed by default
[    0.622513] clocksource: Switched to clocksource kvm-clock
[    0.636429] VFS: Disk quotas dquot_6.6.0
[    0.651811] VFS: Dquot-cache hash table entries: 512 (order 0, 4096 bytes)
[    0.653809] AppArmor: AppArmor Filesystem Enabled
[    0.655198] pnp: PnP ACPI init
[    0.656714] pnp: PnP ACPI: found 5 devices
[    0.664659] clocksource: acpi_pm: mask: 0xffffff max_cycles: 0xffffff, 
max_idle_ns: 2085701024 ns
[    0.667437] NET: Registered protocol family 2
[    0.668880] tcp_listen_portaddr_hash hash table entries: 256 (order: 0, 4096 
bytes)
[    0.671110] TCP established hash table entries: 4096 (order: 3, 32768 bytes)
[    0.673024] TCP bind hash table entries: 4096 (order: 4, 65536 bytes)
[    0.674852] TCP: Hash tables configured (established 4096 bind 4096)
[    0.676652] UDP hash table entries: 256 (order: 1, 8192 bytes)
[    0.678243] UDP-Lite hash table entries: 256 (order: 1, 8192 bytes)
[    0.680013] NET: Registered protocol family 1
[    0.681266] NET: Registered protocol family 44
[    0.682571] pci 0000:00:01.0: PIIX3: Enabling Passive Release
[    0.684201] pci 0000:00:00.0: Limiting direct PCI/PCI transfers
[    0.685934] pci 0000:00:01.0: Activating ISA DMA hang workarounds
[    0.713228] PCI Interrupt Link [LNKD] enabled at IRQ 11
[    0.740734] pci 0000:00:01.2: quirk_usb_early_handoff+0x0/0x6a0 took 51847 
usecs
[    0.742913] pci 0000:00:02.0: Video device with shadowed ROM at [mem 
0x000c0000-0x000dffff]
[    0.745435] Unpacking initramfs...
[    1.097261] Freeing initrd memory: 20168K
[    1.098512] clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 
0x212248ec3b8, max_idle_ns: 440795232693 ns
[    1.101108] check: Scanning for low memory corruption every 60 seconds
[    1.104378] Initialise system trusted keyrings
[    1.105545] Key type blacklist registered
[    1.106590] workingset: timestamp_bits=36 max_order=17 bucket_order=0
[    1.109575] zbud: loaded
[    1.110795] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[    1.112444] fuse init (API version 7.28)
[    1.148019] Key type asymmetric registered
[    1.149169] Asymmetric key parser 'x509' registered
[    1.150394] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 
243)
[    1.152287] io scheduler mq-deadline registered
[    1.153557] shpchp: Standard Hot Plug PCI Controller Driver version: 0.4
[    1.155315] input: Power Button as 
/devices/LNXSYSTM:00/LNXPWRBN:00/input/input0
[    1.157141] ACPI: Power Button [PWRF]
[    1.181030] PCI Interrupt Link [LNKC] enabled at IRQ 10
[    1.243673] PCI Interrupt Link [LNKA] enabled at IRQ 10
[    1.273879] PCI Interrupt Link [LNKB] enabled at IRQ 11
[    1.336241] Serial: 8250/16550 driver, 32 ports, IRQ sharing enabled
[    1.365593] 00:04: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 
16550A
[    1.386725] Linux agpgart interface v0.103
[    1.390123] loop: module loaded
[    1.392418] scsi host0: ata_piix
[    1.393561] scsi host1: ata_piix
[    1.396218] ata1: PATA max MWDMA2 cmd 0x1f0 ctl 0x3f6 bmdma 0xc1c0 irq 14
[    1.398142] ata2: PATA max MWDMA2 cmd 0x170 ctl 0x376 bmdma 0xc1c8 irq 15
[    1.400797] libphy: Fixed MDIO Bus: probed
[    1.402016] tun: Universal TUN/TAP device driver, 1.6
[    1.403522] PPP generic driver version 2.4.2
[    1.404827] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[    1.406620] ehci-pci: EHCI PCI platform driver
[    1.407943] ehci-platform: EHCI generic platform driver
[    1.409418] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[    1.411132] ohci-pci: OHCI PCI platform driver
[    1.412439] ohci-platform: OHCI generic platform driver
[    1.413918] uhci_hcd: USB Universal Host Controller Interface driver
[    1.441532] uhci_hcd 0000:00:01.2: UHCI Host Controller
[    1.443046] uhci_hcd 0000:00:01.2: new USB bus registered, assigned bus 
number 1
[    1.445175] uhci_hcd 0000:00:01.2: detected 2 ports
[    1.446668] uhci_hcd 0000:00:01.2: irq 11, io base 0x0000c180
[    1.448387] usb usb1: New USB device found, idVendor=1d6b, idProduct=0001, 
bcdDevice= 5.00
[    1.450725] usb usb1: New USB device strings: Mfr=3, Product=2, 
SerialNumber=1
[    1.452832] usb usb1: Product: UHCI Host Controller
[    1.454251] usb usb1: Manufacturer: Linux 5.0.0-34-generic uhci_hcd
[    1.457643] usb usb1: SerialNumber: 0000:00:01.2
[    1.459153] hub 1-0:1.0: USB hub found
[    1.460354] hub 1-0:1.0: 2 ports detected
[    1.461792] i8042: PNP: PS/2 Controller [PNP0303:KBD,PNP0f13:MOU] at 
0x60,0x64 irq 1,12
[    1.465183] serio: i8042 KBD port at 0x60,0x64 irq 1
[    1.466609] serio: i8042 AUX port at 0x60,0x64 irq 12
[    1.468221] mousedev: PS/2 mouse device common for all mice
[    1.470217] input: AT Translated Set 2 keyboard as 
/devices/platform/i8042/serio0/input/input1
[    1.473025] rtc_cmos 00:00: RTC can wake from S4
[    1.474990] rtc_cmos 00:00: registered as rtc0
[    1.476359] rtc_cmos 00:00: alarms up to one day, y3k, 114 bytes nvram
[    1.478219] i2c /dev entries driver
[    1.479438] device-mapper: uevent: version 1.0.3
[    1.480859] device-mapper: ioctl: 4.39.0-ioctl (2018-04-03) initialised: 
dm-de...@redhat.com
[    1.483260] platform eisa.0: Probing EISA bus 0
[    1.484601] platform eisa.0: EISA: Cannot allocate resource for mainboard
[    1.486486] platform eisa.0: Cannot allocate resource for EISA slot 1
[    1.489942] platform eisa.0: Cannot allocate resource for EISA slot 2
[    1.491797] platform eisa.0: Cannot allocate resource for EISA slot 3
[    1.493585] platform eisa.0: Cannot allocate resource for EISA slot 4
[    1.495402] platform eisa.0: Cannot allocate resource for EISA slot 5
[    1.497175] platform eisa.0: Cannot allocate resource for EISA slot 6
[    1.499011] platform eisa.0: Cannot allocate resource for EISA slot 7
[    1.501436] platform eisa.0: Cannot allocate resource for EISA slot 8
[    1.504924] platform eisa.0: EISA: Detected 0 cards
[    1.507693] ledtrig-cpu: registered to indicate activity on CPUs
[    1.514350] NET: Registered protocol family 10
[    1.522002] Segment Routing with IPv6
[    1.523211] NET: Registered protocol family 17
[    1.524578] Key type dns_resolver registered
[    1.526258] mce: Using 10 MCE banks
[    1.527506] RAS: Correctable Errors collector initialized.
[    1.529129] sched_clock: Marking stable (1282401242, 
245036445)->(1588620392, -61182705)
[    1.531620] registered taskstats version 1
[    1.533089] Loading compiled-in X.509 certificates
[    1.536375] Loaded X.509 cert 'Build time autogenerated kernel key: 
d75ff59c5698e0617ba5641f0d835c1be63e92b2'
[    1.539500] zswap: loaded using pool lzo/zbud
[    1.546073] Key type big_key registered
[    1.547344] Key type trusted registered
[    1.551151] Key type encrypted registered
[    1.552444] AppArmor: AppArmor sha1 policy hashing enabled
[    1.554030] ima: No TPM chip found, activating TPM-bypass!
[    1.555635] ima: Allocated hash algorithm: sha1
[    1.556974] No architecture policies found
[    1.558238] evm: Initialising EVM extended attributes:
[    1.559756] evm: security.selinux
[    1.560814] evm: security.SMACK64
[    1.561866] evm: security.SMACK64EXEC
[    1.563020] evm: security.SMACK64TRANSMUTE
[    1.564249] evm: security.SMACK64MMAP
[    1.565378] evm: security.apparmor
[    1.566448] evm: security.ima
[    1.567436] evm: security.capability
[    1.568551] evm: HMAC attrs: 0x1
[    1.570634]   Magic number: 11:361:491
[    1.572016] rtc_cmos 00:00: setting system clock to 2019-11-08T17:28:44 UTC 
(1573234124)
[    1.576243] Freeing unused decrypted memory: 2040K
[    1.578404] Freeing unused kernel image memory: 2588K
[    1.587282] Write protecting the kernel read-only data: 22528k
[    1.589609] Freeing unused kernel image memory: 2016K
[    1.591675] Freeing unused kernel image memory: 1728K
[    1.606335] x86/mm: Checked W+X mappings: passed, no W+X pages found.
[    1.608117] x86/mm: Checking user space page tables
[    1.620131] x86/mm: Checked W+X mappings: passed, no W+X pages found.
[    1.621875] Run /init as init process
Loading, please wait...
starting version 237
[    1.746584] virtio_blk virtio2: [vda] 20971520 512-byte logical blocks (10.7 
GB/10.0 GiB)
[    1.752102] FDC 0 is a S82078B
[    1.762234] input: VirtualPS/2 VMware VMMouse as 
/devices/platform/i8042/serio1/input/input4
[    1.771674] input: VirtualPS/2 VMware VMMouse as 
/devices/platform/i8042/serio1/input/input3
[    1.786461]  vda: vda1 vda14 vda15
[    1.789663] virtio_blk virtio3: [vdb] 2097152 512-byte logical blocks (1.07 
GB/1.00 GiB)
[    1.795008] cryptd: max_cpu_qlen set to 1000
[    1.816166]  vdb: vdb1
[    1.818602] virtio_blk virtio4: [vdc] 2097152 512-byte logical blocks (1.07 
GB/1.00 GiB)
[    1.834533] AVX2 version of gcm_enc/dec engaged.
[    1.840156] AES CTR mode by8 optimization enabled
[    1.859362]  vdc: vdc1
[    1.861979] virtio_net virtio0 ens3: renamed from eth0
[    1.924871] md0: detected capacity change from 0 to 1605369856
[    1.927465] BUG: unable to handle kernel NULL pointer dereference at 
0000000000000030
[    1.929855] #PF error: [normal kernel read fault]
[    1.931317] PGD 0 P4D 0 
[    1.932153] Oops: 0000 [#1] SMP PTI
[    1.933322] CPU: 0 PID: 254 Comm: mdadm Not tainted 5.0.0-34-generic 
#36~18.04.1-Ubuntu
[    1.935644] Hardware name: OpenStack Foundation OpenStack Nova, BIOS 
1.10.2-1ubuntu1 04/01/2014
[    1.938176] RIP: 0010:raid0_make_request+0x8d/0x6a0 [raid0]
[    1.939781] Code: e8 48 f7 f1 8b 43 30 c1 e8 09 29 d6 39 f0 0f 87 9b 01 00 
00 49 8b 04 24 48 8d 55 c8 8b 70 10 48 8b 38 e8 26 ff ff ff 49 89 c6 <48> 8b 04 
25 30 00 00 00 48 8b 80 80 00 00 00 f6 80 18 04 00 00 10
[    1.961687] RSP: 0018:ffffbac140337588 EFLAGS: 00010287
[    1.963297] RAX: ffff8ebc9e58a540 RBX: ffff8ebc9e1e7e00 RCX: ffff8ebc9e58a558
[    1.965200] RDX: ffffbac1403375e8 RSI: 0000000000000002 RDI: ffff8ebc9e58a540
[    1.967121] RBP: ffffbac140337620 R08: 0000000000000000 R09: 0000000000000000
[    1.969037] R10: 0000000000000000 R11: 0000000000000001 R12: ffff8ebc9efbd800
[    1.970961] R13: 0000000000000000 R14: ffff8ebc9e58a540 R15: ffffbac140337648
[    1.972968] FS:  00007f8f98878740(0000) GS:ffff8ebc9f200000(0000) 
knlGS:0000000000000000
[    1.975376] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    1.977016] CR2: 0000000000000030 CR3: 000000001eb56006 CR4: 00000000001606f0
[    1.978932] Call Trace:
[    1.979861]  ? __update_load_avg_se+0x121/0x260
[    1.982562]  md_handle_request+0x126/0x1a0
[    1.983845]  md_make_request+0x90/0x190
[    1.985030]  generic_make_request+0x19e/0x3f0
[    1.986388]  submit_bio+0x73/0x140
[    1.987542]  ? submit_bio+0x73/0x140
[    1.988659]  ? guard_bio_eod+0x32/0x100
[    1.989842]  submit_bh_wbc+0x185/0x1b0
[    1.991075]  block_read_full_page+0x212/0x380
[    1.992436]  ? check_disk_change+0x70/0x70
[    1.993679]  ? count_shadow_nodes+0x130/0x130
[    1.995006]  blkdev_readpage+0x18/0x20
[    1.996176]  do_read_cache_page+0x37b/0x790
[    1.997499]  ? blkdev_writepages+0x10/0x10
[    1.998742]  ? get_page_from_freelist+0x154e/0x1560
[    2.000181]  read_cache_page+0x12/0x20
[    2.001311]  read_dev_sector+0x2d/0xd0
[    2.002529]  read_lba+0x134/0x220
[    2.003616]  efi_partition+0x138/0x780
[    2.004782]  ? string+0x60/0x90
[    2.005804]  ? vsnprintf+0xfb/0x510
[    2.006850]  ? snprintf+0x45/0x70
[    2.007976]  ? is_gpt_valid.part.7+0x420/0x420
[    2.009351]  check_partition+0x13f/0x250
[    2.010505]  ? is_gpt_valid.part.7+0x420/0x420
[    2.011863]  ? check_partition+0x13f/0x250
[    2.014690]  rescan_partitions+0xaf/0x360
[    2.015938]  __blkdev_get+0x34b/0x580
[    2.017094]  ? _cond_resched+0x19/0x40
[    2.018212]  ? inode_lru_isolate+0x190/0x190
[    2.019452]  blkdev_get+0x131/0x340
[    2.020603]  ? bd_acquire+0xd0/0xd0
[    2.021710]  ? bdget+0x3e/0x120
[    2.022734]  ? bd_acquire+0xd0/0xd0
[    2.023847]  blkdev_open+0x92/0x100
[    2.024906]  do_dentry_open+0x1f8/0x3a0
[    2.026137]  vfs_open+0x2f/0x40
[    2.027179]  path_openat+0x2e8/0x1700
[    2.028331]  ? unlazy_walk+0x3b/0xb0
[    2.029411]  ? terminate_walk+0x90/0x100
[    2.030675]  ? link_path_walk.part.34+0x520/0x5a0
[    2.032176]  do_filp_open+0x9b/0x110
[    2.033366]  ? __check_object_size+0xdb/0x1b0
[    2.034679]  ? strncpy_from_user+0x54/0x190
[    2.035902]  ? __alloc_fd+0x46/0x170
[    2.037026]  do_sys_open+0x1bb/0x2d0
[    2.038106]  ? do_sys_open+0x1bb/0x2d0
[    2.039349]  ? do_mknodat+0x17c/0x210
[    2.040446]  __x64_sys_openat+0x20/0x30
[    2.041578]  do_syscall_64+0x5a/0x120
[    2.044954]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[    2.046864] RIP: 0033:0x7f8f98171c8e
[    2.048049] Code: 25 00 00 41 00 3d 00 00 41 00 74 48 48 8d 05 81 0c 2e 00 
8b 00 85 c0 75 69 89 f2 b8 01 01 00 00 48 89 fe bf 9c ff ff ff 0f 05 <48> 3d 00 
f0 ff ff 0f 87 a6 00 00 00 48 8b 4c 24 28 64 48 33 0c 25
[    2.052883] RSP: 002b:00007fff3c3a3a20 EFLAGS: 00000246 ORIG_RAX: 
0000000000000101
[    2.055005] RAX: ffffffffffffffda RBX: 0000000000004000 RCX: 00007f8f98171c8e
[    2.056910] RDX: 0000000000004000 RSI: 00007fff3c3a3ab0 RDI: 00000000ffffff9c
[    2.058813] RBP: 00007fff3c3a3ab0 R08: 00007fff3c3a3ab0 R09: 0000000000000000
[    2.060773] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000009
[    2.062760] R13: 0000000000000000 R14: 000055800fadacb0 R15: 00007fff3c3a4a20
[    2.064663] Modules linked in: raid0 crct10dif_pclmul crc32_pclmul 
ghash_clmulni_intel aesni_intel aes_x86_64 crypto_simd cryptd glue_helper 
virtio_net psmouse virtio_blk net_failover failover floppy
[    2.069320] CR2: 0000000000000030
[    2.070362] ---[ end trace 8c43adbc77d84ea4 ]---
[    2.071718] RIP: 0010:raid0_make_request+0x8d/0x6a0 [raid0]
[    2.073273] Code: e8 48 f7 f1 8b 43 30 c1 e8 09 29 d6 39 f0 0f 87 9b 01 00 
00 49 8b 04 24 48 8d 55 c8 8b 70 10 48 8b 38 e8 26 ff ff ff 49 89 c6 <48> 8b 04 
25 30 00 00 00 48 8b 80 80 00 00 00 f6 80 18 04 00 00 10
[    2.079868] RSP: 0018:ffffbac140337588 EFLAGS: 00010287
[    2.081342] RAX: ffff8ebc9e58a540 RBX: ffff8ebc9e1e7e00 RCX: ffff8ebc9e58a558
[    2.083289] RDX: ffffbac1403375e8 RSI: 0000000000000002 RDI: ffff8ebc9e58a540
[    2.085205] RBP: ffffbac140337620 R08: 0000000000000000 R09: 0000000000000000
[    2.087156] R10: 0000000000000000 R11: 0000000000000001 R12: ffff8ebc9efbd800
[    2.089101] R13: 0000000000000000 R14: ffff8ebc9e58a540 R15: ffffbac140337648
[    2.091050] FS:  00007f8f98878740(0000) GS:ffff8ebc9f200000(0000) 
knlGS:0000000000000000
[    2.093306] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.094905] CR2: 0000000000000030 CR3: 000000001eb56006 CR4: 00000000001606f0

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https://bugs.launchpad.net/bugs/1849682

Title:
  [REGRESSION]  md/raid0: cannot assemble multi-zone RAID0 with
  default_layout setting

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