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    SubjectRe: [Syzkaller & bisect] There is "__perf_event_overflow" WARNING in v6.1-rc5 kernel in guest
    Hi Peter,

    On 2022-11-16 at 15:40:24 +0100, Peter Zijlstra wrote:
    > On Wed, Nov 16, 2022 at 11:39:53AM +0800, Pengfei Xu wrote:
    > > Hi Peter and perf expert,
    > >
    > > Greeting!
    > >
    > > Platform: TGL-H
    > >
    > > There is "__perf_event_overflow" WARNING issue in v6.1-rc5 kernel in
    > > guest in double check test.
    > >
    > > Found first bad commit is ca6c21327c6af02b7eec31ce4b9a740a18c6c13f
    > > "perf: Fix missing SIGTRAPs"
    > >
    > > And revert this commit on top of v6.1-rc5, this issue could not be reproduced.
    > >
    > > Guest kconfig, reproduce code from syzkaller, and bisect info are in attached.
    > >
    > > And more detailed info is in link:
    > > https://github.com/xupengfe/syzkaller_logs/tree/main/221114_134736___perf_event_overflow
    > >
    > > If it's helpful and in time, please add the Reported-by tag from me.
    >
    > Does this help?
    >
    > https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?h=perf/urgent&id=bb88f9695460bec25aa30ba9072595025cf6c8af
    Thanks for your link!
    I installed the patch from above link on top of v6.1-rc5 kernel, the patch
    is in attached.

    And I still could reproduce this issue.
    I use below loop to execute the binary, it's reproduced in the 485 times
    execution.
    "
    for((i=0; ;i++)); do
    echo "$i times ./repro"
    ./repro
    done
    "
    485 times ./repro
    [ 87.978410] ------------[ cut here ]------------
    [ 87.978430] WARNING: CPU: 0 PID: 970 at kernel/events/core.c:9329 __perf_event_overflow+0x22b/0x270
    [ 87.978464] Modules linked in:
    [ 87.978470] CPU: 0 PID: 970 Comm: repro Not tainted 6.1.0-rc5-kvmperfoverflow+ #10
    [ 87.978487] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014
    [ 87.978498] RIP: 0010:__perf_event_overflow+0x22b/0x270
    [ 87.978516] Code: b6 45 d3 84 c0 0f 84 26 ff ff ff e8 4f 31 ec ff 8b 75 d4 44 89 ff e8 04 32 ec ff 44 3b 7d d4 0f 84 0c ff ff ff e8 35 31 ec ff <0f> 0b e9 00 6
    [ 87.978531] RSP: 0000:fffffe000000db58 EFLAGS: 00010046
    [ 87.978543] RAX: 0000000000000000 RBX: ffff888004ed5ce0 RCX: ffffffff8138b67c
    [ 87.978554] RDX: 0000000000000000 RSI: ffff88800b8e9fc0 RDI: 0000000000000002
    [ 87.978565] RBP: fffffe000000db88 R08: 0000001ffad06476 R09: 0000000000000000
    [ 87.978583] R10: 0000000000000000 R11: 0000000000000000 R12: fffffe000000def8
    [ 87.978594] R13: fffffe000000dc00 R14: 0000000000000000 R15: 0000000088db7a04
    [ 87.978607] FS: 00007f9988c8b740(0000) GS:ffff88807dc00000(0000) knlGS:ffff88807dc00000
    [ 87.978625] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    [ 87.978639] CR2: 0000000020000200 CR3: 000000000a77c003 CR4: 0000000000770ef0
    [ 87.978655] PKRU: 55555554
    [ 87.978662] Call Trace:
    [ 87.978667] <NMI>
    [ 87.978675] perf_event_overflow+0x33/0x40
    [ 87.978705] handle_pmi_common+0x2d8/0x560
    [ 87.978736] ? write_comp_data+0x2f/0x90
    [ 87.978760] ? write_comp_data+0x2f/0x90
    [ 87.978783] intel_pmu_handle_irq+0x183/0x680
    [ 87.978805] perf_event_nmi_handler+0x42/0x70
    [ 87.978842] nmi_handle+0x63/0x160
    [ 87.978872] default_do_nmi+0x77/0x190
    [ 87.978903] exc_nmi+0x157/0x190
    [ 87.978932] end_repeat_nmi+0x16/0x67
    [ 87.978963] RIP: 0010:asm_sysvec_irq_work+0x0/0x30
    [ 87.978993] Code: ca fc 6a ff e8 a1 05 00 00 48 89 c4 48 8d 6c 24 01 48 89 e7 e8 e1 56 ea ff e9 bc 06 00 00 66 66 2e 0f 1f 84 00 00 00 00 00 90 <f3> 0f 1e fa 4
    [ 87.979010] RSP: 0000:fffffe0000002fd8 EFLAGS: 00000002
    [ 87.979024] RAX: 0000000000000003 RBX: 0000000000000000 RCX: 00007f9988db059d
    [ 87.979037] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000200
    [ 87.979049] RBP: 00007ffe528b2a70 R08: 0000000000000003 R09: 0000000000401a60
    [ 87.979062] R10: 00000000ffffffff R11: 0000000000000202 R12: 00000000004010e0
    [ 87.979075] R13: 00007ffe528b2b50 R14: 0000000000000000 R15: 0000000000000000
    [ 87.979093] ? asm_sysvec_thermal+0x30/0x30
    [ 87.979123] ? asm_sysvec_thermal+0x30/0x30
    [ 87.979153] </NMI>
    [ 87.979158] <ENTRY_TRAMPOLINE>
    [ 87.979165] </ENTRY_TRAMPOLINE>
    [ 87.979171] ---[ end trace 0000000000000000 ]---

    Before the loop execution, I tried several times manually, and sometimes, I
    saw "Trace/breakpoint trap (core dumped)" after executed repro, but there is
    no any dmesg info generated.

    Anyway all the dmesg and patch is in attached. Hope it's helpful.

    Thanks!
    BR.
    From e042cf64c1740cc81de2701a0ffe47d43c4fb267 Mon Sep 17 00:00:00 2001
    From: Pengfei Xu <pengfei.xu@intel.com>
    Date: Thu, 17 Nov 2022 09:15:38 +0800
    Subject: [PATCH] The patch from
    https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?h=perf/urgent&id=bb88f9695460bec25aa30ba9072595025cf6c8af

    Signed-off-by: Pengfei Xu <pengfei.xu@intel.com>
    ---
    kernel/events/core.c | 25 +++++++++++++++++++------
    1 file changed, 19 insertions(+), 6 deletions(-)

    diff --git a/kernel/events/core.c b/kernel/events/core.c
    index 4ec3717003d5..884871427a94 100644
    --- a/kernel/events/core.c
    +++ b/kernel/events/core.c
    @@ -9306,14 +9306,27 @@ static int __perf_event_overflow(struct perf_event *event,
    }

    if (event->attr.sigtrap) {
    - /*
    - * Should not be able to return to user space without processing
    - * pending_sigtrap (kernel events can overflow multiple times).
    - */
    - WARN_ON_ONCE(event->pending_sigtrap && event->attr.exclude_kernel);
    + unsigned int pending_id = 1;
    +
    + if (regs)
    + pending_id = hash32_ptr((void *)instruction_pointer(regs)) ?: 1;
    if (!event->pending_sigtrap) {
    - event->pending_sigtrap = 1;
    + event->pending_sigtrap = pending_id;
    local_inc(&event->ctx->nr_pending);
    + } else if (event->attr.exclude_kernel) {
    + /*
    + * Should not be able to return to user space without
    + * consuming pending_sigtrap; with exceptions:
    + *
    + * 1. Where !exclude_kernel, events can overflow again
    + * in the kernel without returning to user space.
    + *
    + * 2. Events that can overflow again before the IRQ-
    + * work without user space progress (e.g. hrtimer).
    + * To approximate progress (with false negatives),
    + * check 32-bit hash of the current IP.
    + */
    + WARN_ON_ONCE(event->pending_sigtrap != pending_id);
    }
    event->pending_addr = data->addr;
    irq_work_queue(&event->pending_irq);
    --
    2.31.1
    [ 0.000000] Linux version 6.1.0-rc5-kvmperfoverflow+ (root@xpf.sh.intel.com) (gcc (GCC) 8.5.0 20210514 (Red Hat 8.5.0-10), GNU ld version 2.36.1-2.el8) #10 SM2
    [ 0.000000] Command line: console=ttyS0 root=/dev/sda earlyprintk=serial net.ifnames=0 thunderbolt.dyndbg
    [ 0.000000] KERNEL supported cpus:
    [ 0.000000] Intel GenuineIntel
    [ 0.000000] AMD AuthenticAMD
    [ 0.000000] Hygon HygonGenuine
    [ 0.000000] Centaur CentaurHauls
    [ 0.000000] zhaoxin Shanghai
    [ 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 0x020: 'AVX-512 opmask'
    [ 0.000000] x86/fpu: Supporting XSAVE feature 0x040: 'AVX-512 Hi256'
    [ 0.000000] x86/fpu: Supporting XSAVE feature 0x080: 'AVX-512 ZMM_Hi256'
    [ 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[5]: 832, xstate_sizes[5]: 64
    [ 0.000000] x86/fpu: xstate_offset[6]: 896, xstate_sizes[6]: 512
    [ 0.000000] x86/fpu: xstate_offset[7]: 1408, xstate_sizes[7]: 1024
    [ 0.000000] x86/fpu: xstate_offset[9]: 2432, xstate_sizes[9]: 8
    [ 0.000000] x86/fpu: Enabled xstate features 0x2e7, context size is 2440 bytes, using 'compacted' format.
    [ 0.000000] signal: max sigframe size: 3632
    [ 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 0x0000000000100000-0x000000007ffdffff] usable
    [ 0.000000] BIOS-e820: [mem 0x000000007ffe0000-0x000000007fffffff] reserved
    [ 0.000000] BIOS-e820: [mem 0x00000000feffc000-0x00000000feffffff] reserved
    [ 0.000000] BIOS-e820: [mem 0x00000000fffc0000-0x00000000ffffffff] reserved
    [ 0.000000] printk: bootconsole [earlyser0] enabled
    [ 0.000000] NX (Execute Disable) protection: active
    [ 0.000000] SMBIOS 2.8 present.
    [ 0.000000] DMI: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014
    [ 0.000000] Hypervisor detected: KVM
    [ 0.000000] kvm-clock: Using msrs 4b564d01 and 4b564d00
    [ 0.000003] kvm-clock: using sched offset of 359320737 cycles
    [ 0.000558] clocksource: kvm-clock: mask: 0xffffffffffffffff max_cycles: 0x1cd42e4dffb, max_idle_ns: 881590591483 ns
    [ 0.002592] tsc: Detected 3110.400 MHz processor
    [ 0.012983] e820: update [mem 0x00000000-0x00000fff] usable ==> reserved
    [ 0.013006] e820: remove [mem 0x000a0000-0x000fffff] usable
    [ 0.013028] last_pfn = 0x7ffe0 max_arch_pfn = 0x400000000
    [ 0.013657] x86/PAT: Configuration [0-7]: WB WC UC- UC WB WP UC- WT
    [ 0.024182] found SMP MP-table at [mem 0x000f5ba0-0x000f5baf]
    [ 0.024862] Using GB pages for direct mapping
    [ 0.026600] ACPI: Early table checksum verification disabled
    [ 0.027187] ACPI: RSDP 0x00000000000F59C0 000014 (v00 BOCHS )
    [ 0.027830] ACPI: RSDT 0x000000007FFE1951 000034 (v01 BOCHS BXPC 00000001 BXPC 00000001)
    [ 0.028937] ACPI: FACP 0x000000007FFE17FD 000074 (v01 BOCHS BXPC 00000001 BXPC 00000001)
    [ 0.029996] ACPI: DSDT 0x000000007FFE0040 0017BD (v01 BOCHS BXPC 00000001 BXPC 00000001)
    [ 0.031054] ACPI: FACS 0x000000007FFE0000 000040
    [ 0.031545] ACPI: APIC 0x000000007FFE1871 000080 (v01 BOCHS BXPC 00000001 BXPC 00000001)
    [ 0.032450] ACPI: HPET 0x000000007FFE18F1 000038 (v01 BOCHS BXPC 00000001 BXPC 00000001)
    [ 0.033359] ACPI: WAET 0x000000007FFE1929 000028 (v01 BOCHS BXPC 00000001 BXPC 00000001)
    [ 0.034252] ACPI: Reserving FACP table memory at [mem 0x7ffe17fd-0x7ffe1870]
    [ 0.034983] ACPI: Reserving DSDT table memory at [mem 0x7ffe0040-0x7ffe17fc]
    [ 0.035709] ACPI: Reserving FACS table memory at [mem 0x7ffe0000-0x7ffe003f]
    [ 0.036442] ACPI: Reserving APIC table memory at [mem 0x7ffe1871-0x7ffe18f0]
    [ 0.037179] ACPI: Reserving HPET table memory at [mem 0x7ffe18f1-0x7ffe1928]
    [ 0.037918] ACPI: Reserving WAET table memory at [mem 0x7ffe1929-0x7ffe1950]
    [ 0.039907] No NUMA configuration found
    [ 0.040324] Faking a node at [mem 0x0000000000000000-0x000000007ffdffff]
    [ 0.041131] NODE_DATA(0) allocated [mem 0x7ffb5000-0x7ffdffff]
    [ 0.045966] Zone ranges:
    [ 0.046245] DMA [mem 0x0000000000001000-0x0000000000ffffff]
    [ 0.046914] DMA32 [mem 0x0000000001000000-0x000000007ffdffff]
    [ 0.047565] Normal empty
    [ 0.047881] Device empty
    [ 0.048198] Movable zone start for each node
    [ 0.048662] Early memory node ranges
    [ 0.049058] node 0: [mem 0x0000000000001000-0x000000000009efff]
    [ 0.049725] node 0: [mem 0x0000000000100000-0x000000007ffdffff]
    [ 0.050389] Initmem setup node 0 [mem 0x0000000000001000-0x000000007ffdffff]
    [ 0.051418] On node 0, zone DMA: 1 pages in unavailable ranges
    [ 0.051442] On node 0, zone DMA: 97 pages in unavailable ranges
    [ 0.056715] On node 0, zone DMA32: 32 pages in unavailable ranges
    [ 0.057672] ACPI: PM-Timer IO Port: 0x608
    [ 0.058795] ACPI: LAPIC_NMI (acpi_id[0xff] dfl dfl lint[0x1])
    [ 0.059486] IOAPIC[0]: apic_id 0, version 17, address 0xfec00000, GSI 0-23
    [ 0.060246] ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl)
    [ 0.060936] ACPI: INT_SRC_OVR (bus 0 bus_irq 5 global_irq 5 high level)
    [ 0.061649] ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level)
    [ 0.062364] ACPI: INT_SRC_OVR (bus 0 bus_irq 10 global_irq 10 high level)
    [ 0.063089] ACPI: INT_SRC_OVR (bus 0 bus_irq 11 global_irq 11 high level)
    [ 0.063829] ACPI: Using ACPI (MADT) for SMP configuration information
    [ 0.064571] ACPI: HPET id: 0x8086a201 base: 0xfed00000
    [ 0.065233] TSC deadline timer available
    [ 0.065657] smpboot: Allowing 2 CPUs, 0 hotplug CPUs
    [ 0.066305] kvm-guest: KVM setup pv remote TLB flush
    [ 0.066931] kvm-guest: setup PV sched yield
    [ 0.067523] PM: hibernation: Registered nosave memory: [mem 0x00000000-0x00000fff]
    [ 0.068496] PM: hibernation: Registered nosave memory: [mem 0x0009f000-0x0009ffff]
    [ 0.069498] PM: hibernation: Registered nosave memory: [mem 0x000a0000-0x000effff]
    [ 0.070482] PM: hibernation: Registered nosave memory: [mem 0x000f0000-0x000fffff]
    [ 0.071483] [mem 0x80000000-0xfeffbfff] available for PCI devices
    [ 0.072264] Booting paravirtualized kernel on KVM
    [ 0.072796] clocksource: refined-jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 7645519600211568 ns
    [ 0.074105] setup_percpu: NR_CPUS:8192 nr_cpumask_bits:2 nr_cpu_ids:2 nr_node_ids:1
    [ 0.075282] percpu: Embedded 62 pages/cpu s217088 r8192 d28672 u1048576
    [ 0.076179] pcpu-alloc: s217088 r8192 d28672 u1048576 alloc=1*2097152
    [ 0.076200] pcpu-alloc: [0] 0 1
    [ 0.076387] kvm-guest: PV spinlocks enabled
    [ 0.076982] PV qspinlock hash table entries: 256 (order: 0, 4096 bytes, linear)
    [ 0.077991] Fallback order for Node 0: 0
    [ 0.078555] Built 1 zonelists, mobility grouping on. Total pages: 515808
    [ 0.079326] Policy zone: DMA32
    [ 0.079661] Kernel command line: net.ifnames=0 console=ttyS0 root=/dev/sda earlyprintk=serial net.ifnames=0 thunderbolt.dyndbg
    [ 0.081914] Dentry cache hash table entries: 262144 (order: 9, 2097152 bytes, linear)
    [ 0.083071] Inode-cache hash table entries: 131072 (order: 8, 1048576 bytes, linear)
    [ 0.084221] mem auto-init: stack:off, heap alloc:off, heap free:off
    [ 0.088982] Memory: 1999736K/2096632K available (30736K kernel code, 4081K rwdata, 7528K rodata, 3624K init, 10528K bss, 96640K reserved, 0K cma-reserved)
    [ 0.091766] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=2, Nodes=1
    [ 0.092537] kmemleak: Kernel memory leak detector disabled
    [ 0.093175] ftrace: allocating 66320 entries in 260 pages
    [ 0.118532] ftrace: allocated 260 pages with 2 groups
    [ 0.120878] Dynamic Preempt: voluntary
    [ 0.121473] rcu: Preemptible hierarchical RCU implementation.
    [ 0.122213] rcu: RCU restricting CPUs from NR_CPUS=8192 to nr_cpu_ids=2.
    [ 0.123105] Trampoline variant of Tasks RCU enabled.
    [ 0.123740] Rude variant of Tasks RCU enabled.
    [ 0.124308] Tracing variant of Tasks RCU enabled.
    [ 0.124918] rcu: RCU calculated value of scheduler-enlistment delay is 25 jiffies.
    [ 0.125850] rcu: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=2
    [ 0.158946] NR_IRQS: 524544, nr_irqs: 440, preallocated irqs: 16
    [ 0.159929] rcu: srcu_init: Setting srcu_struct sizes based on contention.
    [ 0.169905] Console: colour VGA+ 80x25
    [ 0.170370] printk: console [ttyS0] enabled
    [ 0.171273] printk: bootconsole [earlyser0] disabled
    [ 0.172382] ACPI: Core revision 20220331
    [ 0.173105] clocksource: hpet: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604467 ns
    [ 0.174235] APIC: Switch to symmetric I/O mode setup
    [ 0.175004] x2apic enabled
    [ 0.175536] Switched APIC routing to physical x2apic.
    [ 0.176112] kvm-guest: setup PV IPIs
    [ 0.177605] ..TIMER: vector=0x30 apic1=0 pin1=2 apic2=-1 pin2=-1
    [ 0.178322] clocksource: tsc-early: mask: 0xffffffffffffffff max_cycles: 0x2cd5a8bb032, max_idle_ns: 440795365915 ns
    [ 0.179452] Calibrating delay loop (skipped) preset value.. 6220.80 BogoMIPS (lpj=12441600)
    [ 0.180359] pid_max: default: 32768 minimum: 301
    [ 0.181056] LSM: Security Framework initializing
    [ 0.181569] Yama: becoming mindful.
    [ 0.182154] Mount-cache hash table entries: 4096 (order: 3, 32768 bytes, linear)
    [ 0.183454] Mountpoint-cache hash table entries: 4096 (order: 3, 32768 bytes, linear)
    [ 0.185501] x86/cpu: User Mode Instruction Prevention (UMIP) activated
    [ 0.187523] Last level iTLB entries: 4KB 0, 2MB 0, 4MB 0
    [ 0.188372] Last level dTLB entries: 4KB 0, 2MB 0, 4MB 0, 1GB 0
    [ 0.189272] Spectre V1 : Mitigation: usercopy/swapgs barriers and __user pointer sanitization
    [ 0.190180] Spectre V2 : WARNING: Unprivileged eBPF is enabled with eIBRS on, data leaks possible via Spectre v2 BHB attacks!
    [ 0.191452] Spectre V2 : Mitigation: Enhanced IBRS
    [ 0.192144] Spectre V2 : Spectre v2 / SpectreRSB mitigation: Filling RSB on context switch
    [ 0.193150] Spectre V2 : Spectre v2 / PBRSB-eIBRS: Retire a single CALL on VMEXIT
    [ 0.193912] Spectre V2 : mitigation: Enabling conditional Indirect Branch Prediction Barrier
    [ 0.194764] Speculative Store Bypass: Mitigation: Speculative Store Bypass disabled via prctl
    [ 0.326769] Freeing SMP alternatives memory: 56K
    [ 0.327536] smpboot: CPU0: Genuine Intel(R) CPU 0000 @ 2.20GHz (family: 0x6, model: 0x8d, stepping: 0x0)
    [ 0.328820] cblist_init_generic: Setting adjustable number of callback queues.
    [ 0.329616] cblist_init_generic: Setting shift to 1 and lim to 1.
    [ 0.330393] cblist_init_generic: Setting shift to 1 and lim to 1.
    [ 0.331183] cblist_init_generic: Setting shift to 1 and lim to 1.
    [ 0.331493] Performance Events: Icelake events, full-width counters, Intel PMU driver.
    [ 0.332539] ... version: 2
    [ 0.332979] ... bit width: 48
    [ 0.333449] ... generic registers: 8
    [ 0.333945] ... value mask: 0000ffffffffffff
    [ 0.334580] ... max period: 00007fffffffffff
    [ 0.335223] ... fixed-purpose events: 3
    [ 0.335448] ... event mask: 00000007000000ff
    [ 0.336349] rcu: Hierarchical SRCU implementation.
    [ 0.336859] rcu: Max phase no-delay instances is 1000.
    [ 0.340053] smp: Bringing up secondary CPUs ...
    [ 0.340847] x86: Booting SMP configuration:
    [ 0.341338] .... node #0, CPUs: #1
    [ 0.341885] smp: Brought up 1 node, 2 CPUs
    [ 0.341885] smpboot: Max logical packages: 1
    [ 0.343452] smpboot: Total of 2 processors activated (12441.60 BogoMIPS)
    [ 0.344827] devtmpfs: initialized
    [ 0.344827] x86/mm: Memory block size: 128MB
    [ 0.347806] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 7645041785100000 ns
    [ 0.348985] futex hash table entries: 512 (order: 3, 32768 bytes, linear)
    [ 0.349916] pinctrl core: initialized pinctrl subsystem

    [ 0.351004] *************************************************************
    [ 0.351454] ** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **
    [ 0.352162] ** **
    [ 0.352841] ** IOMMU DebugFS SUPPORT HAS BEEN ENABLED IN THIS KERNEL **
    [ 0.353558] ** **
    [ 0.354278] ** This means that this kernel is built to expose internal **
    [ 0.354970] ** IOMMU data structures, which may compromise security on **
    [ 0.355446] ** your system. **
    [ 0.356139] ** **
    [ 0.356836] ** If you see this message and you are not debugging the **
    [ 0.357533] ** kernel, report this immediately to your vendor! **
    [ 0.358229] ** **
    [ 0.358915] ** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **
    [ 0.359447] *************************************************************
    [ 0.360200] PM: RTC time: 01:18:15, date: 2022-11-17
    [ 0.363679] NET: Registered PF_NETLINK/PF_ROUTE protocol family
    [ 0.365008] DMA: preallocated 256 KiB GFP_KERNEL pool for atomic allocations
    [ 0.365757] DMA: preallocated 256 KiB GFP_KERNEL|GFP_DMA pool for atomic allocations
    [ 0.366623] DMA: preallocated 256 KiB GFP_KERNEL|GFP_DMA32 pool for atomic allocations
    [ 0.367489] audit: initializing netlink subsys (disabled)
    [ 0.368161] audit: type=2000 audit(1668647896.511:1): state=initialized audit_enabled=0 res=1
    [ 0.368161] thermal_sys: Registered thermal governor 'fair_share'
    [ 0.368832] thermal_sys: Registered thermal governor 'bang_bang'
    [ 0.369480] thermal_sys: Registered thermal governor 'step_wise'
    [ 0.370088] thermal_sys: Registered thermal governor 'user_space'
    [ 0.371473] cpuidle: using governor ladder
    [ 0.372559] cpuidle: using governor menu
    [ 0.373316] acpiphp: ACPI Hot Plug PCI Controller Driver version: 0.5
    [ 0.374275] PCI: Using configuration type 1 for base access
    [ 0.385990] kprobes: kprobe jump-optimization is enabled. All kprobes are optimized if possible.
    [ 0.669861] HugeTLB: registered 1.00 GiB page size, pre-allocated 0 pages
    [ 0.670713] HugeTLB: 16380 KiB vmemmap can be freed for a 1.00 GiB page
    [ 0.671409] HugeTLB: registered 2.00 MiB page size, pre-allocated 0 pages
    [ 0.671462] HugeTLB: 28 KiB vmemmap can be freed for a 2.00 MiB page
    [ 0.673192] ACPI: Added _OSI(Module Device)
    [ 0.673646] ACPI: Added _OSI(Processor Device)
    [ 0.674097] ACPI: Added _OSI(3.0 _SCP Extensions)
    [ 0.674587] ACPI: Added _OSI(Processor Aggregator Device)
    [ 0.680399] ACPI: 1 ACPI AML tables successfully acquired and loaded
    [ 0.683974] ACPI: Interpreter enabled
    [ 0.684458] ACPI: PM: (supports S0 S3 S4 S5)
    [ 0.684935] ACPI: Using IOAPIC for interrupt routing
    [ 0.685487] PCI: Using host bridge windows from ACPI; if necessary, use "pci=nocrs" and report a bug
    [ 0.686447] PCI: Using E820 reservations for host bridge windows
    [ 0.687725] ACPI: Enabled 2 GPEs in block 00 to 0F
    [ 0.702366] ACPI: PCI Root Bridge [PCI0] (domain 0000 [bus 00-ff])
    [ 0.703048] acpi PNP0A03:00: _OSC: OS supports [ASPM ClockPM Segments MSI EDR HPX-Type3]
    [ 0.703455] acpi PNP0A03:00: _OSC: not requesting OS control; OS requires [ExtendedConfig ASPM ClockPM MSI]
    [ 0.704526] acpi PNP0A03:00: fail to add MMCONFIG information, can't access extended PCI configuration space under this bridge.
    [ 0.707542] acpiphp: Slot [3] registered
    [ 0.708038] acpiphp: Slot [4] registered
    [ 0.708546] acpiphp: Slot [5] registered
    [ 0.709017] acpiphp: Slot [6] registered
    [ 0.709492] acpiphp: Slot [7] registered
    [ 0.709988] acpiphp: Slot [8] registered
    [ 0.710472] acpiphp: Slot [9] registered
    [ 0.710970] acpiphp: Slot [10] registered
    [ 0.711467] acpiphp: Slot [11] registered
    [ 0.711957] acpiphp: Slot [12] registered
    [ 0.712460] acpiphp: Slot [13] registered
    [ 0.712932] acpiphp: Slot [14] registered
    [ 0.713417] acpiphp: Slot [15] registered
    [ 0.713919] acpiphp: Slot [16] registered
    [ 0.714414] acpiphp: Slot [17] registered
    [ 0.714895] acpiphp: Slot [18] registered
    [ 0.715377] acpiphp: Slot [19] registered
    [ 0.715510] acpiphp: Slot [20] registered
    [ 0.716028] acpiphp: Slot [21] registered
    [ 0.716506] acpiphp: Slot [22] registered
    [ 0.716999] acpiphp: Slot [23] registered
    [ 0.717504] acpiphp: Slot [24] registered
    [ 0.718070] acpiphp: Slot [25] registered
    [ 0.718660] acpiphp: Slot [26] registered
    [ 0.719165] acpiphp: Slot [27] registered
    [ 0.719514] acpiphp: Slot [28] registered
    [ 0.720009] acpiphp: Slot [29] registered
    [ 0.720508] acpiphp: Slot [30] registered
    [ 0.721011] acpiphp: Slot [31] registered
    [ 0.721469] PCI host bridge to bus 0000:00
    [ 0.721913] pci_bus 0000:00: root bus resource [io 0x0000-0x0cf7 window]
    [ 0.722619] pci_bus 0000:00: root bus resource [io 0x0d00-0xffff window]
    [ 0.723452] pci_bus 0000:00: root bus resource [mem 0x000a0000-0x000bffff window]
    [ 0.724272] pci_bus 0000:00: root bus resource [mem 0x80000000-0xfebfffff window]
    [ 0.725060] pci_bus 0000:00: root bus resource [mem 0x100000000-0x17fffffff window]
    [ 0.725880] pci_bus 0000:00: root bus resource [bus 00-ff]
    [ 0.726643] pci 0000:00:00.0: [8086:1237] type 00 class 0x060000
    [ 0.730162] pci 0000:00:01.0: [8086:7000] type 00 class 0x060100
    [ 0.731656] pci 0000:00:01.1: [8086:7010] type 00 class 0x010180
    [ 0.734157] pci 0000:00:01.1: reg 0x20: [io 0xc040-0xc04f]
    [ 0.735690] pci 0000:00:01.1: legacy IDE quirk: reg 0x10: [io 0x01f0-0x01f7]
    [ 0.736596] pci 0000:00:01.1: legacy IDE quirk: reg 0x14: [io 0x03f6]
    [ 0.737406] pci 0000:00:01.1: legacy IDE quirk: reg 0x18: [io 0x0170-0x0177]
    [ 0.738274] pci 0000:00:01.1: legacy IDE quirk: reg 0x1c: [io 0x0376]
    [ 0.739420] pci 0000:00:01.3: [8086:7113] type 00 class 0x068000
    [ 0.739832] pci 0000:00:01.3: quirk: [io 0x0600-0x063f] claimed by PIIX4 ACPI
    [ 0.740823] pci 0000:00:01.3: quirk: [io 0x0700-0x070f] claimed by PIIX4 SMB
    [ 0.742332] pci 0000:00:02.0: [1234:1111] type 00 class 0x030000
    [ 0.743768] pci 0000:00:02.0: reg 0x10: [mem 0xfd000000-0xfdffffff pref]
    [ 0.746088] pci 0000:00:02.0: reg 0x18: [mem 0xfebf0000-0xfebf0fff]
    [ 0.750290] pci 0000:00:02.0: reg 0x30: [mem 0xfebe0000-0xfebeffff pref]
    [ 0.751124] pci 0000:00:02.0: Video device with shadowed ROM at [mem 0x000c0000-0x000dffff]
    [ 0.754202] pci 0000:00:03.0: [8086:100e] type 00 class 0x020000
    [ 0.755466] pci 0000:00:03.0: reg 0x10: [mem 0xfebc0000-0xfebdffff]
    [ 0.756890] pci 0000:00:03.0: reg 0x14: [io 0xc000-0xc03f]
    [ 0.761002] pci 0000:00:03.0: reg 0x30: [mem 0xfeb80000-0xfebbffff pref]
    [ 0.774165] ACPI: PCI: Interrupt link LNKA configured for IRQ 10
    [ 0.775235] ACPI: PCI: Interrupt link LNKB configured for IRQ 10
    [ 0.775818] ACPI: PCI: Interrupt link LNKC configured for IRQ 11
    [ 0.776933] ACPI: PCI: Interrupt link LNKD configured for IRQ 11
    [ 0.777960] ACPI: PCI: Interrupt link LNKS configured for IRQ 9
    [ 0.779468] iommu: Default domain type: Translated
    [ 0.780036] iommu: DMA domain TLB invalidation policy: lazy mode
    [ 0.781247] SCSI subsystem initialized
    [ 0.781739] libata version 3.00 loaded.
    [ 0.781828] ACPI: bus type USB registered
    [ 0.782318] usbcore: registered new interface driver usbfs
    [ 0.783094] usbcore: registered new interface driver hub
    [ 0.783470] usbcore: registered new device driver usb
    [ 0.784219] pps_core: LinuxPPS API ver. 1 registered
    [ 0.784742] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it>
    [ 0.785690] PTP clock support registered
    [ 0.786228] EDAC MC: Ver: 3.0.0
    [ 0.786713] EDAC DEBUG: edac_mc_sysfs_init: device mc created
    [ 0.787396] NetLabel: Initializing
    [ 0.787449] NetLabel: domain hash size = 128
    [ 0.787895] NetLabel: protocols = UNLABELED CIPSOv4 CALIPSO
    [ 0.788521] NetLabel: unlabeled traffic allowed by default
    [ 0.789247] PCI: Using ACPI for IRQ routing
    [ 0.789765] PCI: pci_cache_line_size set to 64 bytes
    [ 0.789861] e820: reserve RAM buffer [mem 0x0009fc00-0x0009ffff]
    [ 0.789871] e820: reserve RAM buffer [mem 0x7ffe0000-0x7fffffff]
    [ 0.789973] pci 0000:00:02.0: vgaarb: setting as boot VGA device
    [ 0.790616] pci 0000:00:02.0: vgaarb: bridge control possible
    [ 0.791261] pci 0000:00:02.0: vgaarb: VGA device added: decodes=io+mem,owns=io+mem,locks=none
    [ 0.791450] vgaarb: loaded
    [ 0.792157] hpet0: at MMIO 0xfed00000, IRQs 2, 8, 0
    [ 0.792757] hpet0: 3 comparators, 64-bit 100.000000 MHz counter
    [ 4.216342] clocksource: Switched to clocksource kvm-clock
    [ 4.217257] VFS: Disk quotas dquot_6.6.0
    [ 4.217705] VFS: Dquot-cache hash table entries: 512 (order 0, 4096 bytes)
    [ 4.218591] pnp: PnP ACPI init
    [ 4.219233] pnp 00:02: [dma 2]
    [ 4.219853] pnp: PnP ACPI: found 6 devices
    [ 4.229602] clocksource: acpi_pm: mask: 0xffffff max_cycles: 0xffffff, max_idle_ns: 2085701024 ns
    [ 4.230926] NET: Registered PF_INET protocol family
    [ 4.231788] IP idents hash table entries: 32768 (order: 6, 262144 bytes, linear)
    [ 4.234226] tcp_listen_portaddr_hash hash table entries: 1024 (order: 2, 16384 bytes, linear)
    [ 4.235152] Table-perturb hash table entries: 65536 (order: 6, 262144 bytes, linear)
    [ 4.235994] TCP established hash table entries: 16384 (order: 5, 131072 bytes, linear)
    [ 4.236949] TCP bind hash table entries: 16384 (order: 7, 524288 bytes, linear)
    [ 4.237861] TCP: Hash tables configured (established 16384 bind 16384)
    [ 4.238608] UDP hash table entries: 1024 (order: 3, 32768 bytes, linear)
    [ 4.239331] UDP-Lite hash table entries: 1024 (order: 3, 32768 bytes, linear)
    [ 4.240177] NET: Registered PF_UNIX/PF_LOCAL protocol family
    [ 4.247587] RPC: Registered named UNIX socket transport module.
    [ 4.248230] RPC: Registered udp transport module.
    [ 4.248699] RPC: Registered tcp transport module.
    [ 4.249167] RPC: Registered tcp NFSv4.1 backchannel transport module.
    [ 4.249865] pci_bus 0000:00: resource 4 [io 0x0000-0x0cf7 window]
    [ 4.250544] pci_bus 0000:00: resource 5 [io 0x0d00-0xffff window]
    [ 4.251166] pci_bus 0000:00: resource 6 [mem 0x000a0000-0x000bffff window]
    [ 4.251910] pci_bus 0000:00: resource 7 [mem 0x80000000-0xfebfffff window]
    [ 4.252611] pci_bus 0000:00: resource 8 [mem 0x100000000-0x17fffffff window]
    [ 4.253565] pci 0000:00:01.0: PIIX3: Enabling Passive Release
    [ 4.254197] pci 0000:00:00.0: Limiting direct PCI/PCI transfers
    [ 4.254898] PCI: CLS 0 bytes, default 64
    [ 4.255626] clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x2cd5a8bb032, max_idle_ns: 440795365915 ns
    [ 4.332651] Initialise system trusted keyrings
    [ 4.333305] Key type blacklist registered
    [ 4.333903] workingset: timestamp_bits=36 max_order=19 bucket_order=0
    [ 4.340665] zbud: loaded
    [ 4.342021] squashfs: version 4.0 (2009/01/31) Phillip Lougher
    [ 4.343503] NFS: Registering the id_resolver key type
    [ 4.344066] Key type id_resolver registered
    [ 4.344477] Key type id_legacy registered
    [ 4.344963] nfs4filelayout_init: NFSv4 File Layout Driver Registering...
    [ 4.345713] nfs4flexfilelayout_init: NFSv4 Flexfile Layout Driver Registering...
    [ 4.346638] fuse: init (API version 7.37)
    [ 4.347287] SGI XFS with ACLs, security attributes, realtime, quota, no debug enabled
    [ 4.349222] 9p: Installing v9fs 9p2000 file system support
    [ 4.359380] Key type asymmetric registered
    [ 4.359835] Asymmetric key parser 'x509' registered
    [ 4.360994] alg: self-tests for CTR-KDF (hmac(sha256)) passed
    [ 4.361730] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 243)
    [ 4.362580] io scheduler mq-deadline registered
    [ 4.363134] io scheduler bfq registered
    [ 4.364226] shpchp: Standard Hot Plug PCI Controller Driver version: 0.4
    [ 4.365201] IPMI message handler: version 39.2
    [ 4.365733] ipmi device interface
    [ 4.367314] input: Power Button as /devices/LNXSYSTM:00/LNXPWRBN:00/input/input0
    [ 4.368362] ACPI: button: Power Button [PWRF]
    [ 4.369646] ERST DBG: ERST support is disabled.
    [ 4.370694] Serial: 8250/16550 driver, 32 ports, IRQ sharing enabled
    [ 4.371593] serial 00:04: GPIO lookup for consumer rs485-term
    [ 4.371611] serial 00:04: using ACPI for GPIO lookup
    [ 4.371627] acpi PNP0501:00: GPIO: looking up rs485-term-gpios
    [ 4.371640] acpi PNP0501:00: GPIO: looking up rs485-term-gpio
    [ 4.371650] serial 00:04: using lookup tables for GPIO lookup
    [ 4.371659] serial 00:04: No GPIO consumer rs485-term found
    [ 4.371905] 00:04: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A
    [ 4.378504] Linux agpgart interface v0.103
    [ 4.379364] ACPI: bus type drm_connector registered
    [ 4.388630] brd: module loaded
    [ 4.394755] loop: module loaded
    [ 4.396591] ata_piix 0000:00:01.1: version 2.13
    [ 4.397859] scsi host0: ata_piix
    [ 4.398559] scsi host1: ata_piix
    [ 4.399037] ata1: PATA max MWDMA2 cmd 0x1f0 ctl 0x3f6 bmdma 0xc040 irq 14
    [ 4.399839] ata2: PATA max MWDMA2 cmd 0x170 ctl 0x376 bmdma 0xc048 irq 15
    [ 4.401030] mdio_bus fixed-0: GPIO lookup for consumer reset
    [ 4.401042] mdio_bus fixed-0: using lookup tables for GPIO lookup
    [ 4.401051] mdio_bus fixed-0: No GPIO consumer reset found
    [ 4.401310] tun: Universal TUN/TAP device driver, 1.6
    [ 4.401934] e100: Intel(R) PRO/100 Network Driver
    [ 4.402441] e100: Copyright(c) 1999-2006 Intel Corporation
    [ 4.403066] e1000: Intel(R) PRO/1000 Network Driver
    [ 4.403679] e1000: Copyright (c) 1999-2006 Intel Corporation.
    [ 4.509317] ACPI: \_SB_.LNKC: Enabled at IRQ 11
    [ 4.559622] ata1: found unknown device (class 0)
    [ 4.560897] ata1.00: ATA-7: QEMU HARDDISK, 2.5+, max UDMA/100
    [ 4.561671] ata1.00: 16777216 sectors, multi 16: LBA48
    [ 4.562736] ata2: found unknown device (class 0)
    [ 4.564077] ata2.00: ATAPI: QEMU DVD-ROM, 2.5+, max UDMA/100
    [ 4.565377] scsi 0:0:0:0: Direct-Access ATA QEMU HARDDISK 2.5+ PQ: 0 ANSI: 5
    [ 4.567764] sd 0:0:0:0: [sda] 16777216 512-byte logical blocks: (8.59 GB/8.00 GiB)
    [ 4.568790] sd 0:0:0:0: [sda] Write Protect is off
    [ 4.569433] sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
    [ 4.569484] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
    [ 4.570012] sd 0:0:0:0: Attached scsi generic sg0 type 0
    [ 4.570762] sd 0:0:0:0: [sda] Preferred minimum I/O size 512 bytes
    [ 4.572588] scsi 1:0:0:0: CD-ROM QEMU QEMU DVD-ROM 2.5+ PQ: 0 ANSI: 5
    [ 4.588516] sd 0:0:0:0: [sda] Attached SCSI disk
    [ 4.604098] scsi 1:0:0:0: Attached scsi generic sg1 type 5
    [ 4.839639] e1000 0000:00:03.0 eth0: (PCI:33MHz:32-bit) 52:54:00:12:34:56
    [ 4.840338] e1000 0000:00:03.0 eth0: Intel(R) PRO/1000 Network Connection
    [ 4.841028] e1000e: Intel(R) PRO/1000 Network Driver
    [ 4.841501] e1000e: Copyright(c) 1999 - 2015 Intel Corporation.
    [ 4.842101] igb: Intel(R) Gigabit Ethernet Network Driver
    [ 4.842606] igb: Copyright (c) 2007-2014 Intel Corporation.
    [ 4.843206] PPP generic driver version 2.4.2
    [ 4.844049] VFIO - User Level meta-driver version: 0.3
    [ 4.844837] usbcore: registered new interface driver uas
    [ 4.845451] usbcore: registered new interface driver usb-storage
    [ 4.846130] i8042: PNP: PS/2 Controller [PNP0303:KBD,PNP0f13:MOU] at 0x60,0x64 irq 1,12
    [ 4.847522] serio: i8042 KBD port at 0x60,0x64 irq 1
    [ 4.847976] serio: i8042 AUX port at 0x60,0x64 irq 12
    [ 4.848857] mousedev: PS/2 mouse device common for all mice
    [ 4.849863] input: AT Translated Set 2 keyboard as /devices/platform/i8042/serio0/input/input1
    [ 4.851344] input: VirtualPS/2 VMware VMMouse as /devices/platform/i8042/serio1/input/input4
    [ 4.851528] rtc_cmos 00:05: RTC can wake from S4
    [ 4.852541] input: VirtualPS/2 VMware VMMouse as /devices/platform/i8042/serio1/input/input3
    [ 4.853791] rtc_cmos 00:05: registered as rtc0
    [ 4.854523] rtc_cmos 00:05: setting system clock to 2022-11-17T01:18:20 UTC (1668647900)
    [ 4.855636] rtc_cmos 00:05: GPIO lookup for consumer wp
    [ 4.855650] rtc_cmos 00:05: using ACPI for GPIO lookup
    [ 4.855664] acpi PNP0B00:00: GPIO: looking up wp-gpios
    [ 4.855679] acpi PNP0B00:00: GPIO: looking up wp-gpio
    [ 4.855691] rtc_cmos 00:05: using lookup tables for GPIO lookup
    [ 4.855703] rtc_cmos 00:05: No GPIO consumer wp found
    [ 4.855774] rtc_cmos 00:05: alarms up to one day, y3k, 242 bytes nvram, hpet irqs
    [ 4.856853] i2c_dev: i2c /dev entries driver
    [ 4.857466] device-mapper: core: CONFIG_IMA_DISABLE_HTABLE is disabled. Duplicate IMA measurements will not be recorded in the IMA log.
    [ 4.859146] device-mapper: uevent: version 1.0.3
    [ 4.860009] device-mapper: ioctl: 4.47.0-ioctl (2022-07-28) initialised: dm-devel@redhat.com
    [ 4.861089] intel_pstate: CPU model not supported
    [ 4.861785] sdhci: Secure Digital Host Controller Interface driver
    [ 4.862568] sdhci: Copyright(c) Pierre Ossman
    [ 4.863215] sdhci-pltfm: SDHCI platform and OF driver helper
    [ 4.864022] ledtrig-cpu: registered to indicate activity on CPUs
    [ 4.865092] drop_monitor: Initializing network drop monitor service
    [ 4.866526] NET: Registered PF_INET6 protocol family
    [ 4.868394] Segment Routing with IPv6
    [ 4.868933] In-situ OAM (IOAM) with IPv6
    [ 4.869466] NET: Registered PF_PACKET protocol family
    [ 4.870309] 9pnet: Installing 9P2000 support
    [ 4.870915] Key type dns_resolver registered
    [ 4.872216] IPI shorthand broadcast: enabled
    [ 4.872817] sched_clock: Marking stable (4856915564, 14779948)->(4883871393, -12175881)
    [ 4.874202] registered taskstats version 1
    [ 4.874824] Loading compiled-in X.509 certificates
    [ 4.875754] zswap: loaded using pool lzo/zbud
    [ 4.876603] Key type .fscrypt registered
    [ 4.877100] Key type fscrypt-provisioning registered
    [ 4.878456] Key type encrypted registered
    [ 4.878992] ima: No TPM chip found, activating TPM-bypass!
    [ 4.879721] ima: Allocated hash algorithm: sha1
    [ 4.880302] ima: No architecture policies found
    [ 4.880911] evm: Initialising EVM extended attributes:
    [ 4.881579] evm: security.selinux
    [ 4.882004] evm: security.SMACK64
    [ 4.882425] evm: security.SMACK64EXEC
    [ 4.882879] evm: security.SMACK64TRANSMUTE
    [ 4.883393] evm: security.SMACK64MMAP
    [ 4.883876] evm: security.apparmor
    [ 4.884319] evm: security.ima
    [ 4.884697] evm: security.capability
    [ 4.885149] evm: HMAC attrs: 0x1
    [ 4.888984] PM: Magic number: 14:681:306
    [ 4.889619] tty tty35: hash matches
    [ 4.890463] RAS: Correctable Errors collector initialized.
    [ 4.891167] md: Waiting for all devices to be available before autodetect
    [ 4.891603] md: If you don't use raid, use raid=noautodetect
    [ 4.891928] md: Autodetecting RAID arrays.
    [ 4.892173] md: autorun ...
    [ 4.892339] md: ... autorun DONE.
    [ 4.894910] EXT4-fs (sda): INFO: recovery required on readonly filesystem
    [ 4.895490] EXT4-fs (sda): write access will be enabled during recovery
    [ 4.933779] EXT4-fs (sda): recovery complete
    [ 4.935938] EXT4-fs (sda): mounted filesystem with ordered data mode. Quota mode: none.
    [ 4.936769] VFS: Mounted root (ext4 filesystem) readonly on device 8:0.
    [ 4.937746] devtmpfs: mounted
    [ 4.952326] Freeing unused decrypted memory: 2036K
    [ 4.955187] Freeing unused kernel image (initmem) memory: 3624K
    [ 4.955795] Write protecting the kernel read-only data: 40960k
    [ 4.959540] Freeing unused kernel image (text/rodata gap) memory: 2028K
    [ 4.960655] Freeing unused kernel image (rodata/data gap) memory: 664K
    [ 5.083696] x86/mm: Checked W+X mappings: passed, no W+X pages found.
    [ 5.084123] Run /sbin/init as init process
    [ 5.084472] with arguments:
    [ 5.084477] /sbin/init
    [ 5.084483] with environment:
    [ 5.084487] HOME=/
    [ 5.084493] TERM=linux
    [ 5.162148] systemd[1]: RTC configured in localtime, applying delta of 0 minutes to system time.
    [ 5.182129] systemd[1]: systemd 239 (239-49.el8) running in system mode. (+PAM +AUDIT +SELINUX +IMA -APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +G)
    [ 5.184305] systemd[1]: Detected virtualization kvm.
    [ 5.184774] systemd[1]: Detected architecture x86-64.
    [ 5.243288] systemd[1]: Set hostname to <test>.
    [ 6.267466] random: crng init done
    [ 6.345362] systemd[1]: Listening on udev Control Socket.
    [ 6.350882] systemd[1]: Listening on Process Core Dump Socket.
    [ 6.352394] systemd[1]: Set up automount Arbitrary Executable File Formats File System Automount Point.
    [ 6.354143] systemd[1]: Listening on initctl Compatibility Named Pipe.
    [ 6.355453] systemd[1]: Listening on Device-mapper event daemon FIFOs.
    [ 6.356780] systemd[1]: Listening on udev Kernel Socket.
    [ 6.667537] EXT4-fs (sda): re-mounted. Quota mode: none.
    [ 8.287836] e1000: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX
    [ 8.288739] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
    [ 8.487305] Spectre V2 : WARNING: Unprivileged eBPF is enabled with eIBRS on, data leaks possible via Spectre v2 BHB attacks!
    [ 8.488738] Spectre V2 : WARNING: Unprivileged eBPF is enabled with eIBRS on, data leaks possible via Spectre v2 BHB attacks!
    [ 87.978410] ------------[ cut here ]------------
    [ 87.978430] WARNING: CPU: 0 PID: 970 at kernel/events/core.c:9329 __perf_event_overflow+0x22b/0x270
    [ 87.978464] Modules linked in:
    [ 87.978470] CPU: 0 PID: 970 Comm: repro Not tainted 6.1.0-rc5-kvmperfoverflow+ #10
    [ 87.978487] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014
    [ 87.978498] RIP: 0010:__perf_event_overflow+0x22b/0x270
    [ 87.978516] Code: b6 45 d3 84 c0 0f 84 26 ff ff ff e8 4f 31 ec ff 8b 75 d4 44 89 ff e8 04 32 ec ff 44 3b 7d d4 0f 84 0c ff ff ff e8 35 31 ec ff <0f> 0b e9 00 6
    [ 87.978531] RSP: 0000:fffffe000000db58 EFLAGS: 00010046
    [ 87.978543] RAX: 0000000000000000 RBX: ffff888004ed5ce0 RCX: ffffffff8138b67c
    [ 87.978554] RDX: 0000000000000000 RSI: ffff88800b8e9fc0 RDI: 0000000000000002
    [ 87.978565] RBP: fffffe000000db88 R08: 0000001ffad06476 R09: 0000000000000000
    [ 87.978583] R10: 0000000000000000 R11: 0000000000000000 R12: fffffe000000def8
    [ 87.978594] R13: fffffe000000dc00 R14: 0000000000000000 R15: 0000000088db7a04
    [ 87.978607] FS: 00007f9988c8b740(0000) GS:ffff88807dc00000(0000) knlGS:ffff88807dc00000
    [ 87.978625] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    [ 87.978639] CR2: 0000000020000200 CR3: 000000000a77c003 CR4: 0000000000770ef0
    [ 87.978655] PKRU: 55555554
    [ 87.978662] Call Trace:
    [ 87.978667] <NMI>
    [ 87.978675] perf_event_overflow+0x33/0x40
    [ 87.978705] handle_pmi_common+0x2d8/0x560
    [ 87.978736] ? write_comp_data+0x2f/0x90
    [ 87.978760] ? write_comp_data+0x2f/0x90
    [ 87.978783] intel_pmu_handle_irq+0x183/0x680
    [ 87.978805] perf_event_nmi_handler+0x42/0x70
    [ 87.978842] nmi_handle+0x63/0x160
    [ 87.978872] default_do_nmi+0x77/0x190
    [ 87.978903] exc_nmi+0x157/0x190
    [ 87.978932] end_repeat_nmi+0x16/0x67
    [ 87.978963] RIP: 0010:asm_sysvec_irq_work+0x0/0x30
    [ 87.978993] Code: ca fc 6a ff e8 a1 05 00 00 48 89 c4 48 8d 6c 24 01 48 89 e7 e8 e1 56 ea ff e9 bc 06 00 00 66 66 2e 0f 1f 84 00 00 00 00 00 90 <f3> 0f 1e fa 4
    [ 87.979010] RSP: 0000:fffffe0000002fd8 EFLAGS: 00000002
    [ 87.979024] RAX: 0000000000000003 RBX: 0000000000000000 RCX: 00007f9988db059d
    [ 87.979037] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000200
    [ 87.979049] RBP: 00007ffe528b2a70 R08: 0000000000000003 R09: 0000000000401a60
    [ 87.979062] R10: 00000000ffffffff R11: 0000000000000202 R12: 00000000004010e0
    [ 87.979075] R13: 00007ffe528b2b50 R14: 0000000000000000 R15: 0000000000000000
    [ 87.979093] ? asm_sysvec_thermal+0x30/0x30
    [ 87.979123] ? asm_sysvec_thermal+0x30/0x30
    [ 87.979153] </NMI>
    [ 87.979158] <ENTRY_TRAMPOLINE>
    [ 87.979165] </ENTRY_TRAMPOLINE>
    [ 87.979171] ---[ end trace 0000000000000000 ]---
    [ 87.979192] perf: interrupt took too long (7554 > 2500), lowering kernel.perf_event_max_sample_rate to 26250
    [ 88.920577] perf: interrupt took too long (9602 > 9442), lowering kernel.perf_event_max_sample_rate to 20750
    [ 89.861029] perf: interrupt took too long (12377 > 12002), lowering kernel.perf_event_max_sample_rate to 16000
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