* Sasha Levin <[email protected]> wrote:
> On 07/06/2015 12:23 PM, Ingo Molnar wrote:
> >
> > * Sasha Levin <[email protected]> wrote:
> >
> >> On 07/06/2015 12:07 PM, Ingo Molnar wrote:
> >>>
> >>> * Sasha Levin <[email protected]> wrote:
> >>>
> >>>> Hey Ingo,
> >>>>
> >>>> I've started seeing the fuzzer hitting the BUG() at
> >>>> arch/x86/kernel/nmi.c:533. git
> >>>> blame pointed to this patch. I know that you didn't see any changes in
> >>>> the compiled
> >>>> file in your testcase, but I do see changes in mine.
> >>>
> >>> Hm, weird - could you send me your .config please?
> >>
> >> Attached.
> >
> > It's still weird: I copied your config to 4d7321381e5c and made 'make
> > oldconfig' -
> > and it asked a couple of questions, which suggests that your config does
> > not come
> > from 4d7321381e5c?
>
> Right, sorry, this is my base config for -next. I just did 'yes "" | make
> oldconfig'
> for the build test.
>
> I've attached it.
>
> > Furthermore, building 4d7321381e5c and 4d7321381e5c^1 gives me:
> >
> > # arch/x86/entry/entry_64.o:
> >
> > text data bss dec hex filename
> > 11530 0 0 11530 2d0a entry_64.o.before
> > 11530 0 0 11530 2d0a entry_64.o.after
> >
> > md5:
> > 1430e793250d5d8572bc2df2997d3929 entry_64.o.before.asm
> > 1430e793250d5d8572bc2df2997d3929 entry_64.o.after.asm
> >
> > i.e. I have trouble reproducing the discrepancy you are seeing. (I also
> > tried
> > allmodconfig/allyesconfig again for good measure - no luck.)
>
> With allyesconfig I don't actually see a change. Only with the config I've
> attached.
So I still cannot reproduce it even with your latest config:
# arch/x86/entry/entry_64.o:
text data bss dec hex filename
11530 0 0 11530 2d0a entry_64.o.before
11530 0 0 11530 2d0a entry_64.o.after
md5:
1430e793250d5d8572bc2df2997d3929 entry_64.o.before.asm
1430e793250d5d8572bc2df2997d3929 entry_64.o.after.asm
but I saw this during the build:
scripts/Makefile.kasan:23: CONFIG_KASAN: compiler does not support all
options. Trying minimal configuration
is your KASAN build more fully enabled, and does the problem reproduce with
CONFIG_KASAN turned off?
Thanks,
Ingo
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