I have just installed the latest kernel and when booting on a xenserver 8.4 vm I get a kernel panic. I guess it has to do with https://access.redhat.com/errata/RHSA-2025:3893
The same happens with a RHEL 8.10 VM.
[ 0.000000] Linux version 4.18.0-553.50.1.el8_10.x86_64 (mockbuild@x64-builder01.almalinux.org) (gcc version 8.5.0 20210514 (Red Hat 8.5.0-26) (GCC)) #1 SMP Tue Apr 15 08:09:22 EDT 2025
[ 0.000000] Command line: BOOT_IMAGE=(hd0,msdos1)/vmlinuz-4.18.0-553.50.1.el8_10.x86_64 root=/dev/mapper/almalinux-root ro crashkernel=auto resume=/dev/mapper/almalinux-swap rd.lvm.lv=almalinux/root rd.lvm.lv=almalinux/swap console=tty0 console=ttyS0,115200n8 vga=0 video=640x480 nomodeset
[ 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: Supporting XSAVE feature 0x200: 'Protection Keys User registers'
[ 0.000000] x86/fpu: xstate_offset[2]: 576, xstate_sizes[2]: 256
[ 0.000000] x86/fpu: xstate_offset[9]: 832, xstate_sizes[9]: 8
[ 0.000000] x86/fpu: Enabled xstate features 0x207, context size is 840 bytes, using 'compacted' format.
[ 0.000000] signal: max sigframe size: 3632
[ 0.000000] BIOS-provided physical RAM map:
[ 0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009dfff] usable
[ 0.000000] BIOS-e820: [mem 0x000000000009e000-0x000000000009ffff] reserved
[ 0.000000] BIOS-e820: [mem 0x00000000000e0000-0x00000000000fffff] reserved
[ 0.000000] BIOS-e820: [mem 0x0000000000100000-0x00000000efffffff] usable
[ 0.000000] BIOS-e820: [mem 0x00000000fc000000-0x00000000fc00afff] ACPI NVS
[ 0.000000] BIOS-e820: [mem 0x00000000fc00b000-0x00000000ffffffff] reserved
[ 0.000000] BIOS-e820: [mem 0x0000000100000000-0x000000010f7fffff] usable
[ 0.000000] NX (Execute Disable) protection: active
[ 0.000000] SMBIOS 2.4 present.
[ 0.000000] DMI: Xen HVM domU, BIOS 4.17 02/07/2025
[ 0.000000] Hypervisor detected: Xen HVM
[ 0.000000] Xen version 4.17.
[ 0.000000] Netfront and the Xen platform PCI driver have been compiled for this kernel: unplug emulated NICs.
[ 0.000000] Blkfront and the Xen platform PCI driver have been compiled for this kernel: unplug emulated disks.
[ 0.000000] You might have to change the root device
[ 0.000000] from /dev/hd[a-d] to /dev/xvd[a-d]
[ 0.000000] in your root= kernel command line option
[ 0.000000] tsc: Fast TSC calibration using PIT
[ 0.000000] tsc: Detected 2095.071 MHz processor
[ 0.000000] tsc: Detected 2095.076 MHz TSC
[ 0.000000] last_pfn = 0x10f800 max_arch_pfn = 0x400000000
[ 0.000000] x86/PAT: Configuration [0-7]: WB WC UC- UC WB WP UC- WT
[ 0.000000] last_pfn = 0xf0000 max_arch_pfn = 0x400000000
[ 0.000000] found SMP MP-table at [mem 0x000fb630-0x000fb63f]
[ 0.000000] Using GB pages for direct mapping
[ 0.000000] RAMDISK: [mem 0x34608000-0x362fbfff]
[ 0.000000] ACPI: Early table checksum verification disabled
[ 0.000000] ACPI: RSDP 0x00000000000EA020 000024 (v02 Xen )
[ 0.000000] ACPI: XSDT 0x00000000FC00A5C0 000044 (v01 Xen HVM 00000000 HVML 00000000)
[ 0.000000] ACPI: FACP 0x00000000FC00A370 0000F4 (v04 Xen HVM 00000000 HVML 00000000)
[ 0.000000] ACPI: DSDT 0x00000000FC001040 0092A3 (v02 Xen HVM 00000000 INTL 20160527)
[ 0.000000] ACPI: FACS 0x00000000FC001000 000040
[ 0.000000] ACPI: FACS 0x00000000FC001000 000040
[ 0.000000] ACPI: APIC 0x00000000FC00A470 000068 (v02 Xen HVM 00000000 HVML 00000000)
[ 0.000000] ACPI: HPET 0x00000000FC00A550 000038 (v01 Xen HVM 00000000 HVML 00000000)
[ 0.000000] ACPI: WAET 0x00000000FC00A590 000028 (v01 Xen HVM 00000000 HVML 00000000)
[ 0.000000] ACPI: Reserving FACP table memory at [mem 0xfc00a370-0xfc00a463]
[ 0.000000] ACPI: Reserving DSDT table memory at [mem 0xfc001040-0xfc00a2e2]
[ 0.000000] ACPI: Reserving FACS table memory at [mem 0xfc001000-0xfc00103f]
[ 0.000000] ACPI: Reserving FACS table memory at [mem 0xfc001000-0xfc00103f]
[ 0.000000] ACPI: Reserving APIC table memory at [mem 0xfc00a470-0xfc00a4d7]
[ 0.000000] ACPI: Reserving HPET table memory at [mem 0xfc00a550-0xfc00a587]
[ 0.000000] ACPI: Reserving WAET table memory at [mem 0xfc00a590-0xfc00a5b7]
[ 0.000000] No NUMA configuration found
[ 0.000000] Faking a node at [mem 0x0000000000000000-0x000000010f7fffff]
[ 0.000000] NODE_DATA(0) allocated [mem 0x10f7d5000-0x10f7fffff]
[ 0.000000] Using crashkernel=auto, the size chosen is a best effort estimation.
[ 0.000000] Reserving 256MB of memory at 3584MB for crashkernel (System RAM: 4087MB)
[ 0.000000] Zone ranges:
[ 0.000000] DMA [mem 0x0000000000001000-0x0000000000ffffff]
[ 0.000000] DMA32 [mem 0x0000000001000000-0x00000000ffffffff]
[ 0.000000] Normal [mem 0x0000000100000000-0x000000010f7fffff]
[ 0.000000] Device empty
[ 0.000000] Movable zone start for each node
[ 0.000000] Early memory node ranges
[ 0.000000] node 0: [mem 0x0000000000001000-0x000000000009dfff]
[ 0.000000] node 0: [mem 0x0000000000100000-0x00000000efffffff]
[ 0.000000] node 0: [mem 0x0000000100000000-0x000000010f7fffff]
[ 0.000000] Zeroed struct page in unavailable ranges: 2147 pages
[ 0.000000] Initmem setup node 0 [mem 0x0000000000001000-0x000000010f7fffff]
[ 0.000000] ACPI: PM-Timer IO Port: 0xb008
[ 0.000000] IOAPIC[0]: apic_id 1, version 17, address 0xfec00000, GSI 0-47
[ 0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl)
[ 0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 5 global_irq 5 low level)
[ 0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 10 global_irq 10 low level)
[ 0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 11 global_irq 11 low level)
[ 0.000000] Using ACPI (MADT) for SMP configuration information
[ 0.000000] ACPI: HPET id: 0x8086a201 base: 0xfed00000
[ 0.000000] TSC deadline timer available
[ 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 0x0009e000-0x0009ffff]
[ 0.000000] PM: Registered nosave memory: [mem 0x000a0000-0x000dffff]
[ 0.000000] PM: Registered nosave memory: [mem 0x000e0000-0x000fffff]
[ 0.000000] PM: Registered nosave memory: [mem 0xf0000000-0xfbffffff]
[ 0.000000] PM: Registered nosave memory: [mem 0xfc000000-0xfc00afff]
[ 0.000000] PM: Registered nosave memory: [mem 0xfc00b000-0xffffffff]
[ 0.000000] [mem 0xf0000000-0xfbffffff] available for PCI devices
[ 0.000000] Booting paravirtualized kernel on Xen HVM
[ 0.000000] clocksource: refined-jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 1910969940391419 ns
[ 0.000000] setup_percpu: NR_CPUS:8192 nr_cpumask_bits:1 nr_cpu_ids:1 nr_node_ids:1
[ 0.000000] percpu: Embedded 63 pages/cpu s221184 r8192 d28672 u2097152
[ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 1029920
[ 0.000000] Policy zone: Normal
[ 0.000000] Kernel command line: BOOT_IMAGE=(hd0,msdos1)/vmlinuz-4.18.0-553.50.1.el8_10.x86_64 root=/dev/mapper/almalinux-root ro crashkernel=auto resume=/dev/mapper/almalinux-swap rd.lvm.lv=almalinux/root rd.lvm.lv=almalinux/swap console=tty0 console=ttyS0,115200n8 vga=0 video=640x480 nomodeset
[ 0.000000] Specific versions of hardware are certified with Red Hat Enterprise Linux 8. Please see the list of hardware certified with Red Hat Enterprise Linux 8 at https://catalog.redhat.com.
[ 0.000000] Booted with the nomodeset parameter. Only the system framebuffer will be available
[ 0.000000] software IO TLB: area num 1.
[ 0.000000] Memory: 3651580K/4185716K available (14339K kernel code, 5958K rwdata, 8576K rodata, 2816K init, 13792K bss, 478056K reserved, 0K cma-reserved)
[ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[ 0.000000] ftrace: allocating 41091 entries in 161 pages
[ 0.000000] ftrace: allocated 161 pages with 3 groups
[ 0.000000] rcu: Hierarchical RCU implementation.
[ 0.000000] rcu: RCU restricting CPUs from NR_CPUS=8192 to nr_cpu_ids=1.
[ 0.000000] Rude variant of Tasks RCU enabled.
[ 0.000000] Tracing variant of Tasks RCU enabled.
[ 0.000000] rcu: RCU calculated value of scheduler-enlistment delay is 100 jiffies.
[ 0.000000] rcu: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=1
[ 0.000000] NR_IRQS: 524544, nr_irqs: 256, preallocated irqs: 16
[ 0.000000] xen:events: Using FIFO-based ABI
[ 0.000000] xen:events: Xen HVM callback vector for event delivery is enabled
[ 0.000000] random: crng done (trusting CPU's manufacturer)
[ 0.001000] Console: colour VGA+ 80x25
[ 0.001000] printk: console [tty0] enabled
[ 0.001000] printk: console [ttyS0] enabled
[ 0.001000] ACPI: Core revision 20220331
[ 0.001000] clocksource: hpet: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 30580167144 ns
[ 0.001006] APIC: Switch to symmetric I/O mode setup
[ 0.002640] x2apic: IRQ remapping doesn't support X2APIC mode
[ 0.005000] ..TIMER: vector=0x30 apic1=0 pin1=2 apic2=0 pin2=0
[ 0.016002] clocksource: tsc-early: mask: 0xffffffffffffffff max_cycles: 0x1e33052aadd, max_idle_ns: 440795310221 ns
[ 0.024003] Calibrating delay loop (skipped), value calculated using timer frequency.. 4190.15 BogoMIPS (lpj=2095076)
[ 0.032001] pid_max: default: 32768 minimum: 301
[ 0.036036] LSM: Security Framework initializing
[ 0.041013] Yama: becoming mindful.
[ 0.044007] SELinux: Initializing.
[ 0.048028] LSM support for eBPF active
[ 0.052460] Dentry cache hash table entries: 524288 (order: 10, 4194304 bytes, vmalloc)
[ 0.059389] Inode-cache hash table entries: 262144 (order: 9, 2097152 bytes, vmalloc)
[ 0.066019] Mount-cache hash table entries: 8192 (order: 4, 65536 bytes, vmalloc)
[ 0.072013] Mountpoint-cache hash table entries: 8192 (order: 4, 65536 bytes, vmalloc)
[ 0.079245] Last level iTLB entries: 4KB 64, 2MB 8, 4MB 8
[ 0.084000] Last level dTLB entries: 4KB 64, 2MB 0, 4MB 0, 1GB 4
[ 0.089007] Spectre V1 : Mitigation: usercopy/swapgs barriers and __user pointer sanitization
[ 0.094002] Spectre V2 : Spectre BHI mitigation: SW BHB clearing on vm exit
[ 0.099000] Spectre V2 : Spectre BHI mitigation: SW BHB clearing on syscall
[ 0.104000] Spectre V2 : Mitigation: Enhanced / Automatic IBRS
[ 0.108000] Spectre V2 : Spectre v2 / SpectreRSB mitigation: Filling RSB on context switch
[ 0.114000] Spectre V2 : Spectre v2 / PBRSB-eIBRS: Retire a single CALL on VMEXIT
[ 0.122001] RETBleed: Mitigation: Enhanced IBRS
[ 0.126001] Spectre V2 : mitigation: Enabling conditional Indirect Branch Prediction Barrier
[ 0.133001] Speculative Store Bypass: Mitigation: Speculative Store Bypass disabled via prctl
[ 0.141005] MMIO Stale Data: Mitigation: Clear CPU buffers
[ 0.165929] Freeing SMP alternatives memory: 36K
[ 0.170090] clocksource: xen: mask: 0xffffffffffffffff max_cycles: 0x1cd42e4dffb, max_idle_ns: 881590591483 ns
[ 0.178004] invalid opcode: 0000 [#1] SMP NOPTI
[ 0.179000] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.18.0-553.50.1.el8_10.x86_64 #1
[ 0.179000] Hardware name: Xen HVM domU, BIOS 4.17 02/07/2025
[ 0.179000] RIP: 0010:xen_time_init+0x66/0x1f2
[ 0.179000] Code: c7 c0 20 c1 01 00 48 8b 14 d5 80 68 3c a6 8a 0d 7d 5b bc ff 48 63 34 02 31 d2 b8 18 00 00 00 48 83 f9 00 75 05 0f 01 c1 eb 03 <0f> 01 d9 85 c0 75 17 48 c7 c7 88 ac 2d a6 e8 47 18 d7 fd 48 c7 05
[ 0.179000] RSP: 0000:ffffa1f800643e48 EFLAGS: 00010286
[ 0.179000] RAX: 0000000000000018 RBX: ffffffffa761caf0 RCX: ffffffffa6fc1600
[ 0.179000] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000007
[ 0.179000] RBP: 0000000000000000 R08: ffffffffa6a38380 R09: c0000000ffff7fff
[ 0.179000] R10: 0000000000000001 R11: ffffa1f800643c38 R12: 0000000000000246
[ 0.179000] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[ 0.179000] FS: 0000000000000000(0000) GS:ffff93f54b400000(0000) knlGS:0000000000000000
[ 0.179000] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 0.179000] CR2: ffff93f50a801000 CR3: 00000000c8e10001 CR4: 00000000007706f0
[ 0.179000] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 0.179000] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 0.179000] PKRU: 55555554
[ 0.179000] Call Trace:
[ 0.179000] ? __die_body+0x1a/0x60
[ 0.179000] ? die+0x2a/0x50
[ 0.179000] ? do_trap+0xe7/0x110
[ 0.179000] ? xen_time_init+0x66/0x1f2
[ 0.179000] ? do_invalid_op+0x36/0x40
[ 0.179000] ? xen_time_init+0x66/0x1f2
[ 0.179000] ? invalid_op+0x14/0x20
[ 0.179000] ? xen_time_init+0x66/0x1f2
[ 0.179000] ? xen_time_init+0x33/0x1f2
[ 0.179000] native_smp_prepare_cpus+0xc4/0x166
[ 0.179000] xen_hvm_smp_prepare_cpus+0xc/0x65
[ 0.179000] kernel_init_freeable+0xd3/0x23a
[ 0.179000] ? rest_init+0xaa/0xaa
[ 0.179000] kernel_init+0xa/0x10a
[ 0.179000] ret_from_fork+0x1f/0x40
[ 0.179000] Modules linked in:
[ 0.425002] ---[ end trace 778194cfa26ba433 ]---
[ 0.428000] RIP: 0010:xen_time_init+0x66/0x1f2
[ 0.431001] Code: c7 c0 20 c1 01 00 48 8b 14 d5 80 68 3c a6 8a 0d 7d 5b bc ff 48 63 34 02 31 d2 b8 18 00 00 00 48 83 f9 00 75 05 0f 01 c1 eb 03 <0f> 01 d9 85 c0 75 17 48 c7 c7 88 ac 2d a6 e8 47 18 d7 fd 48 c7 05
[ 0.443000] RSP: 0000:ffffa1f800643e48 EFLAGS: 00010286
[ 0.447000] RAX: 0000000000000018 RBX: ffffffffa761caf0 RCX: ffffffffa6fc1600
[ 0.452000] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000007
[ 0.457000] RBP: 0000000000000000 R08: ffffffffa6a38380 R09: c0000000ffff7fff
[ 0.462000] R10: 0000000000000001 R11: ffffa1f800643c38 R12: 0000000000000246
[ 0.467000] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[ 0.471001] FS: 0000000000000000(0000) GS:ffff93f54b400000(0000) knlGS:0000000000000000
[ 0.478000] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 0.482001] CR2: ffff93f50a801000 CR3: 00000000c8e10001 CR4: 00000000007706f0
[ 0.487000] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 0.492000] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 0.498000] PKRU: 55555554
[ 0.500001] Kernel panic - not syncing: Fatal exception