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SubjectRe: x86-tip.today (4cdf573) early instaboot
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On Tue, 2018-04-10 at 10:59 +0200, Ingo Molnar wrote:
> * Mike Galbraith <efault@gmx.de> wrote:
>
> > Hi Ingo,
> >
> > FYI, my i4790 box reboots immediately.. or close enough to it that you
> > see nothing at all before again meeting the bios splash. Master with
> > the ~same config works fine. I haven't poked around yet (work).
>
> Hm, so there's been a few 'dangerous' pieces of work merged yesterday-ish.
>
> Prime suspects would be:
>
> triton:~/tip> gll linus..x86/pti
>
> 0564258fb2cf: x86/pti: Leave kernel text global for !PCID
> a5df4f1f0d78: x86/pti: Never implicitly clear _PAGE_GLOBAL for kernel image
> e0bb456e3250: x86/pti: Enable global pages for shared areas
> efad2b415152: x86/mm: Do not forbid _PAGE_RW before init for __ro_after_init
> 4ddee6efdcd0: x86/mm: Comment _PAGE_GLOBAL mystery
> e71e836f463d: x86/mm: Remove extra filtering in pageattr code
> 64c80759408f: x86/mm: Do not auto-massage page protections <== WOOF
> 6baf4bec02db: x86/espfix: Document use of _PAGE_GLOBAL
> 8a57f4849f4f: x86/mm: Introduce "default" kernel PTE mask
> 606c7193d5fb: x86/mm: Undo double _PAGE_PSE clearing
> d1440b23c922: x86/mm: Factor out pageattr _PAGE_GLOBAL setting
> ee1400dda318: Merge branch 'linus' into x86/pti to pick up upstream changes
> 071ccc966ba5: x86/entry/64: Drop idtentry's manual stack switch for user entries
> 9820e1c3376c: x86/uapi: Fix asm/bootparam.h userspace compilation errors
>
> ... which you could test via 0564258fb2cf: if that insta-reboots too then
> 9820e1c3376c^1 is expected to work and 4 bisection steps should pinpoint the
> guilty commit ...

Thanks. I already had a full bisect running, so ended up doing more
than 4 steps, but ended up at the above.

-Mike

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