Messages in this thread | | | Date | Mon, 6 Jul 2015 18:43:30 +0200 | From | Ingo Molnar <> | Subject | Re: [PATCH] x86/asm/entry/64: Clean up entry_64.S |
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* Sasha Levin <sasha.levin@oracle.com> wrote:
> On 07/06/2015 12:23 PM, Ingo Molnar wrote: > > > > * Sasha Levin <sasha.levin@oracle.com> wrote: > > > >> On 07/06/2015 12:07 PM, Ingo Molnar wrote: > >>> > >>> * Sasha Levin <sasha.levin@oracle.com> 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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