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Date: Wed, 21 Dec 2016 23:17:01 -0600
From: Josh Poimboeuf <jpoimboe@redhat.com>
To: Andrey Konovalov <andreyknvl@google.com>
Cc: syzkaller <syzkaller@googlegroups.com>,
        Andrey Ryabinin <aryabinin@virtuozzo.com>,
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        Kostya Serebryany <kcc@google.com>
Subject: Re: x86: warning in unwind_get_return_address
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On Wed, Dec 21, 2016 at 01:46:36PM +0100, Andrey Konovalov wrote:
> On Wed, Dec 21, 2016 at 12:36 AM, Josh Poimboeuf <jpoimboe@redhat.com> wrote:
> >
> > Thanks.  Looking at the stack trace, my guess is that an interrupt hit
> > while running in generated BPF code, and the unwinder got confused
> > because regs->ip points to the generated code.  I may need to disable
> > that warning until we figure out a better solution.
> >
> > Can you share your .config file?
> 
> Sure, attached.

Ok, I was able to recreate with your config.  The culprit was generated
code, as I suspected, though it wasn't BPF, it was a kprobe (created by
dccpprobe_init()).

I'll make a patch to disable the warning.

-- 
Josh