[    0.000000] Linux version 4.15.0-50-generic (buildd@lcy01-amd64-013) (gcc version 7.3.0 (Ubuntu 7.3.0-16ubuntu3)) #54-Ubuntu SMP Mon May 6 18:46:08 UTC 2019 (Ubuntu 4.15.0-50.54-generic 4.15.18)
[    0.000000] Command line: root=/dev/xvda2 ro elevator=noop earlyprintk=xen xencons=hvc console=hvc0 root=/dev/xvda2 ro
[    0.000000] KERNEL supported cpus:
[    0.000000]   Intel GenuineIntel
[    0.000000]   AMD AuthenticAMD
[    0.000000]   Centaur CentaurHauls
[    0.000000] x86/fpu: x87 FPU will use FXSAVE
[    0.000000] e820: BIOS-provided physical RAM map:
[    0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009ffff] usable
[    0.000000] BIOS-e820: [mem 0x00000000000a0000-0x00000000000fefff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000000ff000-0x00000000000fffff] ACPI data
[    0.000000] BIOS-e820: [mem 0x0000000000100000-0x00000000800003ff] usable
[    0.000000] BIOS-e820: [mem 0x00000000fc000000-0x00000000fc007fff] ACPI data
[    0.000000] BIOS-e820: [mem 0x00000000feff8000-0x00000000feffffff] reserved
[    0.000000] NX (Execute Disable) protection: active
[    0.000000] DMI not present or invalid.
[    0.000000] Hypervisor detected: Xen HVM
[    0.000000] Xen version 4.13.
[    0.000000] Xen Platform PCI: unrecognised magic value
[    0.000000] e820: last_pfn = 0x80000 max_arch_pfn = 0x400000000
[    0.000000] x86/PAT: Configuration [0-7]: WB  WC  UC- UC  WB  WP  UC- WT
[    0.000000] Scanning 1 areas for low memory corruption
[    0.000000] Using GB pages for direct mapping
[    0.000000] RAMDISK: [mem 0x02b6d000-0x05000fff]
[    0.000000] ACPI: Early table checksum verification disabled
[    0.000000] ACPI: RSDP 0x00000000000FFFC0 000024 (v02 Xen   )
[    0.000000] ACPI: XSDT 0x00000000FC007F60 000034 (v01 Xen    HVM      00000000 HVML 00000000)
[    0.000000] ACPI: FACP 0x00000000FC007D70 00010C (v05 Xen    HVM      00000000 HVML 00000000)
[    0.000000] ACPI: DSDT 0x00000000FC001050 006C9B (v05 Xen    HVM      00000000 INTL 20180105)
[    0.000000] ACPI: FACS 0x00000000FC001010 000040
[    0.000000] ACPI: FACS 0x00000000FC001010 000040
[    0.000000] ACPI: APIC 0x00000000FC007E80 000034 (v02 Xen    HVM      00000000 HVML 00000000)
[    0.000000] No NUMA configuration found
[    0.000000] Faking a node at [mem 0x0000000000000000-0x000000007fffffff]
[    0.000000] NODE_DATA(0) allocated [mem 0x7ffd5000-0x7fffffff]
[    0.000000] tsc: Fast TSC calibration failed
[    0.000000] tsc: Unable to calibrate against PIT
[    0.000000] tsc: No reference (HPET/PMTIMER) available
[    0.000000] Zone ranges:
[    0.000000]   DMA      [mem 0x0000000000001000-0x0000000000ffffff]
[    0.000000]   DMA32    [mem 0x0000000001000000-0x000000007fffffff]
[    0.000000]   Normal   empty
[    0.000000]   Device   empty
[    0.000000] Movable zone start for each node
[    0.000000] Early memory node ranges
[    0.000000]   node   0: [mem 0x0000000000001000-0x000000000009ffff]
[    0.000000]   node   0: [mem 0x0000000000100000-0x000000007fffffff]
[    0.000000] Reserved but unavailable: 97 pages
[    0.000000] Initmem setup node 0 [mem 0x0000000000001000-0x000000007fffffff]
[    0.000000] ACPI: No IOAPIC entries present
[    0.000000] Using ACPI for processor (LAPIC) configuration information
[    0.000000] smpboot: Allowing 1 CPUs, 0 hotplug CPUs
[    0.000000] PM: Registered nosave memory: [mem 0x00000000-0x00000fff]
[    0.000000] PM: Registered nosave memory: [mem 0x000a0000-0x000fefff]
[    0.000000] PM: Registered nosave memory: [mem 0x000ff000-0x000fffff]
[    0.000000] e820: [mem 0x80000400-0xfbffffff] available for PCI devices
[    0.000000] Booting paravirtualized kernel on Xen PVH
[    0.000000] clocksource: refined-jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 7645519600211568 ns
[    0.000000] random: get_random_bytes called from start_kernel+0x99/0x4fd with crng_init=0
[    0.000000] setup_percpu: NR_CPUS:8192 nr_cpumask_bits:1 nr_cpu_ids:1 nr_node_ids:1
[    0.000000] percpu: Embedded 46 pages/cpu @        (ptrval) s151552 r8192 d28672 u2097152
[    0.000000] PV qspinlock hash table entries: 256 (order: 0, 4096 bytes)
[    0.000000] Built 1 zonelists, mobility grouping on.  Total pages: 515977
[    0.000000] Policy zone: DMA32
[    0.000000] Kernel command line: root=/dev/xvda2 ro elevator=noop earlyprintk=xen xencons=hvc console=hvc0 root=/dev/xvda2 ro
[    0.000000] Memory: 1998084K/2096764K available (12300K kernel code, 2474K rwdata, 4276K rodata, 2412K init, 2416K bss, 98680K reserved, 0K cma-reserved)
[    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[    0.000000] Kernel/User page tables isolation: enabled
[    0.000000] ftrace: allocating 39233 entries in 154 pages
[    0.004000] Hierarchical RCU implementation.
[    0.004000]  RCU restricting CPUs from NR_CPUS=8192 to nr_cpu_ids=1.
[    0.004000]  Tasks RCU enabled.
[    0.004000] RCU: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=1
[    0.004000] Using NULL legacy PIC
[    0.004000] NR_IRQS: 524544, nr_irqs: 32, preallocated irqs: 0
[    0.004000] xen:events: Using FIFO-based ABI
[    0.004000] xen:events: Xen HVM callback vector for event delivery is enabled
[    0.004000] Console: colour dummy device 80x25
[    0.004000] console [hvc0] enabled
[    0.004000] ACPI: Core revision 20170831
[    0.004000] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
[    0.004000] IP: strncmp+0x9/0x50
[    0.004000] PGD 0 P4D 0
[    0.004000] Oops: 0000 [#1] SMP PTI
[    0.004000] Modules linked in:
[    0.004000] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.15.0-50-generic #54-Ubuntu
[    0.004000] RIP: 0010:strncmp+0x9/0x50
[    0.004000] RSP: 0000:ffffffff82403ea0 EFLAGS: 00010206
[    0.004000] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff824627a8
[    0.004000] RDX: 0000000000000006 RSI: ffffffff8213097d RDI: 0000000000000000
[    0.004000] RBP: ffffffff82403ea0 R08: 00000000000014b9 R09: 0000000000000070
[    0.004000] R10: ffffffff82660360 R11: 3133383037313032 R12: 0000000000000000
[    0.004000] R13: ffffffff81e93fb0 R14: ffff88807ffcea40 R15: 0000000000000000
[    0.004000] FS:  0000000000000000(0000) GS:ffff88807fc00000(0000) knlGS:0000000000000000
[    0.004000] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    0.004000] CR2: 0000000000000000 CR3: 000000000240a001 CR4: 00000000000206b0
[    0.004000] Call Trace:
[    0.004000]  acpi_quirk_matches_bios_ids+0x48/0xa0
[    0.004000]  acpi_early_init+0x56/0x117
[    0.004000]  start_kernel+0x431/0x4fd
[    0.004000]  x86_64_start_reservations+0x24/0x26
[    0.004000]  x86_64_start_kernel+0x74/0x77
[    0.004000]  secondary_startup_64+0xa5/0xb0
[    0.004000] Code: 0f b6 47 ff 48 83 c6 01 3a 46 ff 74 eb 19 c0 83 c8 01 5d c3 31 c0 5d c3 66 2e 0f 1f 84 00 00 00 00 00 55 48 85 d2 48 89 e5 74 32 <0f> b6 0f 44 0f b6 06 44 38 c1 75 2a 84 c9 74 22 b8 01 00 00 00
[    0.004000] RIP: strncmp+0x9/0x50 RSP: ffffffff82403ea0
[    0.004000] CR2: 0000000000000000
[    0.004000] ---[ end trace 713ce0a3d72d16dd ]---
[    0.004000] Kernel panic - not syncing: Attempted to kill the idle task!