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    SubjectRe: [LKP] Re: [x86/mm/64] f154f29085: BUG:kernel_reboot-without-warning_in_boot_stage - clang KCOV?
    Hi Boris,

    On Fri, Dec 17, 2021 at 08:52:53PM +0800, Borislav Petkov wrote:
    > ---
    > diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
    > index 0083464de5e3..79b3d67addcc 100644
    > --- a/arch/x86/kernel/cpu/common.c
    > +++ b/arch/x86/kernel/cpu/common.c
    > @@ -384,7 +384,7 @@ void native_write_cr0(unsigned long val)
    > }
    > EXPORT_SYMBOL(native_write_cr0);
    >
    > -void native_write_cr4(unsigned long val)
    > +void __no_profile native_write_cr4(unsigned long val)
    > {
    > unsigned long bits_changed = 0;
    >
    > diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
    > index 75acb6027a87..68d2b7f9a913 100644
    > --- a/arch/x86/kernel/head64.c
    > +++ b/arch/x86/kernel/head64.c
    > @@ -483,7 +483,7 @@ asmlinkage __visible void __init x86_64_start_kernel(char * real_mode_data)
    > /* Kill off the identity-map trampoline */
    > reset_early_page_tables();
    >
    > - __native_tlb_flush_global(native_read_cr4());
    > + __native_tlb_flush_global(this_cpu_read(cpu_tlbstate.cr4));
    >
    > clear_bss();
    >

    We tested your patch, it can fix the issue, thanks.

    =========================================================================================
    compiler/kconfig/rootfs/sleep/tbox_group/testcase:
    clang-14/x86_64-randconfig-a013-20211207/debian-10.4-x86_64-20200603.cgz/1/vm-snb/boot

    commit:
    9de4999050 ("x86/realmode: Add comment for Global bit usage in trampoline_pgd")
    f154f29085 ("x86/mm/64: Flush global TLB on boot and AP bringup")
    d12ddfe498 ("fixup-for-f154f29085")

    9de4999050b5f2e8 f154f290855b070cc94dd44ad25 d12ddfe498329a0967c008d8183
    ---------------- --------------------------- ---------------------------
    fail:runs %reproduction fail:runs %reproduction fail:runs
    | | | | |
    :27 100% 27:27 0% :27 dmesg.BUG:kernel_reboot-without-warning_in_boot_stage

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