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From: Josh Poimboeuf <jpoimboe@redhat.com>
To: Sedat Dilek <sedat.dilek@gmail.com>
Cc: x86@kernel.org, linux-kernel@vger.kernel.org,
	Peter Zijlstra <peterz@infradead.org>,
	Sami Tolvanen <samitolvanen@google.com>,
	Kees Cook <keescook@chromium.org>,
	Nick Desaulniers <ndesaulniers@google.com>,
	Clang-Built-Linux ML <clang-built-linux@googlegroups.com>,
	Miroslav Benes <mbenes@suse.cz>
Subject: Re: [PATCH 00/21] objtool: vmlinux.o and CLANG LTO support
Date: Fri, 15 Jan 2021 13:28:27 -0600	[thread overview]
Message-ID: <20210115192827.d6qsfgegp7fsfn7j@treble> (raw)
In-Reply-To: <CA+icZUUzN96qSudFCJETNAu6-cq1NKfgngh1PM7nxv=FUPuVBQ@mail.gmail.com>

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


      reply	other threads:[~2021-01-15 19:30 UTC|newest]

Thread overview: 54+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-14 19:39 [PATCH 00/21] objtool: vmlinux.o and CLANG LTO support Josh Poimboeuf
2021-01-14 19:39 ` [PATCH 01/21] objtool: Fix seg fault in BT_FUNC() with fake jump Josh Poimboeuf
2021-01-14 20:04   ` Josh Poimboeuf
2021-01-14 19:39 ` [PATCH 02/21] objtool: Fix error handling for STD/CLD warnings Josh Poimboeuf
2021-01-14 19:39 ` [PATCH 03/21] objtool: Fix retpoline detection in asm code Josh Poimboeuf
2021-01-14 19:40 ` [PATCH 04/21] objtool: Fix ".cold" section suffix check for newer versions of GCC Josh Poimboeuf
2021-01-14 19:40 ` [PATCH 05/21] objtool: Support retpoline jump detection for vmlinux.o Josh Poimboeuf
2021-01-14 19:40 ` [PATCH 06/21] x86/ftrace: Add UNWIND_HINT_FUNC annotation for ftrace_stub Josh Poimboeuf
2021-01-14 20:42   ` Steven Rostedt
2021-01-14 19:40 ` [PATCH 07/21] objtool: Assume only ELF functions do sibling calls Josh Poimboeuf
2021-01-14 19:40 ` [PATCH 08/21] objtool: Add asm version of STACK_FRAME_NON_STANDARD Josh Poimboeuf
2021-01-14 19:40 ` [PATCH 09/21] objtool: Combine UNWIND_HINT_RET_OFFSET and UNWIND_HINT_FUNC Josh Poimboeuf
2021-01-14 19:40 ` [PATCH 10/21] objtool: Add xen_start_kernel() to noreturn list Josh Poimboeuf
2021-01-14 19:40 ` [PATCH 11/21] objtool: Move unsuffixed symbol conversion to a helper function Josh Poimboeuf
2021-01-14 20:55   ` [PATCH v1.1 " Josh Poimboeuf
2021-01-14 21:30     ` Sedat Dilek
2021-01-14 19:40 ` [PATCH 12/21] objtool: Add CONFIG_CFI_CLANG support Josh Poimboeuf
2021-01-14 20:49   ` Sami Tolvanen
2021-01-14 20:52     ` Josh Poimboeuf
2021-01-14 20:56   ` [PATCH v1.1 " Josh Poimboeuf
2021-01-14 19:40 ` [PATCH 13/21] x86/xen: Support objtool validation in xen-asm.S Josh Poimboeuf
2021-01-15  0:31   ` boris.ostrovsky
2021-01-14 19:40 ` [PATCH 14/21] x86/xen: Support objtool vmlinux.o validation in xen-head.S Josh Poimboeuf
2021-01-15  0:32   ` boris.ostrovsky
2021-01-15  5:17   ` Jürgen Groß
2021-01-15 19:46     ` Josh Poimboeuf
2021-01-14 19:40 ` [PATCH 15/21] x86/xen/pvh: Convert indirect jump to retpoline Josh Poimboeuf
2021-01-15  0:33   ` boris.ostrovsky
2021-01-15  5:24   ` Jürgen Groß
2021-01-15 15:08     ` Josh Poimboeuf
2021-01-14 19:40 ` [PATCH 16/21] x86/ftrace: Support objtool vmlinux.o validation in ftrace_64.S Josh Poimboeuf
2021-01-14 20:42   ` Steven Rostedt
2021-01-14 19:40 ` [PATCH 17/21] x86/acpi: Convert indirect jump to retpoline Josh Poimboeuf
2021-01-14 22:59   ` Andrew Cooper
2021-01-14 23:47     ` Josh Poimboeuf
2021-01-15  0:54       ` Andrew Cooper
2021-01-14 19:40 ` [PATCH 18/21] x86/acpi: Support objtool validation in wakeup_64.S Josh Poimboeuf
2021-01-14 19:40 ` [PATCH 19/21] x86/power: Convert indirect jumps to retpolines Josh Poimboeuf
2021-01-14 19:40 ` [PATCH 20/21] x86/power: Move restore_registers() to top of the file Josh Poimboeuf
2021-01-14 19:40 ` [PATCH 21/21] x86/power: Support objtool validation in hibernate_asm_64.S Josh Poimboeuf
2021-01-15  0:41 ` [PATCH 00/21] objtool: vmlinux.o and CLANG LTO support Sami Tolvanen
2021-01-15  0:49   ` Nick Desaulniers
2021-01-15 19:52   ` Josh Poimboeuf
2021-01-15 20:19     ` Sedat Dilek
2021-01-15 20:59       ` Josh Poimboeuf
2021-01-15 21:01         ` Sedat Dilek
2021-01-18 17:22   ` Josh Poimboeuf
2021-01-19 21:29     ` Nick Desaulniers
2021-01-20 15:37       ` Josh Poimboeuf
2021-01-15  4:51 ` Sedat Dilek
2021-01-15  5:18   ` Sedat Dilek
2021-01-15 15:30   ` Sedat Dilek
2021-01-15 18:54     ` Sedat Dilek
2021-01-15 19:28       ` Josh Poimboeuf [this message]

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