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

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Date:   Mon, 28 Jan 2019 10:19:14 -0600
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     valdis.kletnieks@...edu
Cc:     Peter Zijlstra <peterz@...radead.org>, linux-kernel@...r.kernel.org
Subject: Re: next-20190125 - objtool complains about dumpstack

On Sun, Jan 27, 2019 at 11:40:10PM -0500, valdis.kletnieks@...edu wrote:
> 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.

Thanks for reporting it.  Here's the fix below.  I'll submit an official
patch soon.

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 0414a0d52262..df9bd60153c9 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -165,6 +165,7 @@ static int __dead_end_function(struct objtool_file *file, struct symbol *func,
 		"fortify_panic",
 		"usercopy_abort",
 		"machine_real_restart",
+		"rewind_stack_do_exit",
 	};
 
 	if (func->bind == STB_WEAK)