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    SubjectRe: [LKP] Re: [x86/mm/64] f154f29085: BUG:kernel_reboot-without-warning_in_boot_stage
    On Thu, Dec 16, 2021 at 03:04:16PM +0800, Yin Fengwei wrote:
    > The testing was with Qemu.

    This is hardly what I asked for.

    > And we found that the hang is related with clang-14.

    I saw that already.

    > The original report showed the kernel is built with clang-14:
    > # build kernel
    > cd linux
    > cp config-5.16.0-rc3-00003-gf154f290855b .config
    > make HOSTCC=clang-14 CC=clang-14 ARCH=x86_64 olddefconfig prepare modules_prepare bzImage modules
    > make HOSTCC=clang-14 CC=clang-14 ARCH=x86_64 INSTALL_MOD_PATH=<mod-install-dir> modules_install

    I saw that too.

    > Looks like KASAN related stub generated by clang-14 (KASAN_SHADOW_OFFSET and asan_report).
    > This function is early function called before kasan_init.
    > Looks like we need to disable KASAN_SANITIZE for arch/x86/kernel/cpu/common.c. So clang-14 will
    > be happy with this kind of early TLB flush? Thanks.

    Ok, I don't understand: I asked for how exactly to reproduce and whether
    you can send me your vmlinux you built with your clang-14. What I get is
    some possible explanation about what might be happening.

    So what do you expect me to do? Say, "oh, sure, you're right, send me a
    patch" without even being able to see for myself what the root cause is?

    What if it is not the kernel's fault but clang-14 is miscompiling crap
    as in so many other cases?

    I built clang-14 and built with your .config and it works here fine. So
    why does yours fail?

    Or what's the point of all this?

    I mean, if you cannot send me what I ask for, you can say so. Then I can
    ignore this whole report altogether and waste my time somewhere else.


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