linux-kernel - Re: next-20190125 - objtool complains about dumpstack

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Date:   Sun, 27 Jan 2019 23:40:10 -0500
From:   valdis.kletnieks@...edu
To:     Josh Poimboeuf <jpoimboe@...hat.com>
cc:     Peter Zijlstra <peterz@...radead.org>, linux-kernel@...r.kernel.org
Subject: Re: next-20190125 - objtool complains about dumpstack

On Sun, 27 Jan 2019 22:18:25 -0600, Josh Poimboeuf said:
> On Sun, Jan 27, 2019 at 10:45:03PM -0500, valdis.kletnieks@...edu wrote:
> > Seen in a build:
> > 
> >   CC      arch/x86/kernel/dumpstack.o
> > arch/x86/kernel/dumpstack.o: warning: objtool: oops_begin()+0x9: undefined stack state
> > arch/x86/kernel/dumpstack.o: warning: objtool: oops_begin()+0x0: stack state mismatch: cfa1=6+16 cfa2=7+8
> > 
> > Probably a gcc9 code generation that objtool doesn't know about?
>
> Can you share the .o file?

Sure.  Attached.



View attachment "dumpstack.o" of type "text/plain " (35392 bytes)