linux-kernel - Re: [PATCH 00/21] objtool: vmlinux.o and CLANG LTO support

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Message-ID: <20210115192827.d6qsfgegp7fsfn7j@treble>
Date:   Fri, 15 Jan 2021 13:28:27 -0600
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Sedat Dilek <sedat.dilek@...il.com>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Clang-Built-Linux ML <clang-built-linux@...glegroups.com>,
        Miroslav Benes <mbenes@...e.cz>
Subject: Re: [PATCH 00/21] objtool: vmlinux.o and CLANG LTO support

On Fri, Jan 15, 2021 at 07:54:29PM +0100, Sedat Dilek wrote:
> > > I tried this series on top of clang-cfi and it segfaults here.
> > >
> > > + info OBJTOOL vmlinux.o
> > > + [  != silent_ ]
> > > + printf   %-7s %s\n OBJTOOL vmlinux.o
> > >  OBJTOOL vmlinux.o
> > > + tools/objtool/objtool orc generate --duplicate --mcount --vmlinux
> > > --no-fp --no-unreachable --retpoline --uaccess vmlinux.o
> > > Segmentation fault
> > > + on_exit
> > > + [ 139 -ne 0 ]
> > > + cleanup
> > > + rm -f .btf.*
> > > + rm -f .tmp_System.map
> > > + rm -f .tmp_initcalls.lds
> > > + rm -f .tmp_symversions.lds
> > > + rm -f .tmp_vmlinux*
> > > + rm -f System.map
> > > + rm -f vmlinux
> > > + rm -f vmlinux.o
> > > make[3]: *** [Makefile:1213: vmlinux] Error 139
> > >
> >
> > I re-tried with the latest clang-lto Git and switched to Debian's LLVM-11.0.1.
> > This build was successful.
> > No objtool-vmlinux warnings observed.
> >
> > In the next step I try with my selfmade LLVM-11.1.0-rc1 (to see if it's broken).
> >
> 
> Good, my selfmade LLVM-11.1.0-rc1 is not broken with clang-lto.
> 
> + info OBJTOOL vmlinux.o
> + [  != silent_ ]
> + printf   %-7s %s\n OBJTOOL vmlinux.o
>  OBJTOOL vmlinux.o
> + tools/objtool/objtool orc generate --duplicate --mcount --vmlinux
> --no-fp --no-unreachable --retpoline --uaccess vmlinux.o
> + make -f ./scripts/Makefile.modpost MODPOST_VMLINUX=1
>  scripts/mod/modpost -m    -o vmlinux.symvers vmlinux.o
> + info MODINFO modules.builtin.modinfo
> 
> Josh and Sami, any idea what's going on with clang-cfi an this patchset?

No idea, I haven't seen this.  Are you still able to recreate?

-- 
Josh