From: Steven Rostedt <rostedt@goodmis.org>
To: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Nick Desaulniers <ndesaulniers@google.com>,
Xi Ruoyao <xry111@mengyan1223.wang>,
"# 3.4.x" <stable@vger.kernel.org>,
Arnd Bergmann <arnd@kernel.org>,
"Peter Zijlstra (Intel)" <peterz@infradead.org>,
Miroslav Benes <mbenes@suse.cz>,
"maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)"
<x86@kernel.org>, LKML <linux-kernel@vger.kernel.org>,
linux-tip-commits@vger.kernel.org
Subject: Re: [tip: objtool/urgent] objtool: Fix seg fault with Clang non-section symbols
Date: Mon, 15 Feb 2021 16:22:09 -0500 [thread overview]
Message-ID: <20210215162209.5e2a475b@gandalf.local.home> (raw)
In-Reply-To: <20210215155806.bjcouvmkapj4pa4y@treble>
On Mon, 15 Feb 2021 09:58:06 -0600
Josh Poimboeuf <jpoimboe@redhat.com> wrote:
> On Mon, Feb 15, 2021 at 09:53:07AM -0500, Steven Rostedt wrote:
> > On Sun, 14 Feb 2021 09:51:47 -0600
> > Josh Poimboeuf <jpoimboe@redhat.com> wrote:
> >
> > > Steve, looks like recordmcount avoids referencing weak symbols directly
> > > by their function symbol. Maybe it can just skip weak symbols which
> > > don't have a section symbol, since this seems like a rare scenario.
> >
> > When does the .text.unlikely section disappear? During the creation of the
> > object, or later in the linker stage?
>
> The section is there, but the symbol associated with the section
> (".text.unlikely" symbol) isn't generated by the assembler.
>
Greg,
Does this fix the issue with you? It appears to fix it for my arch linux
VM that I created that uses binutils 2.36-3.
-- Steve
diff --git a/scripts/recordmcount.h b/scripts/recordmcount.h
index f9b19524da11..558b67f8364e 100644
--- a/scripts/recordmcount.h
+++ b/scripts/recordmcount.h
@@ -562,7 +562,7 @@ static char const * __has_rel_mcount(Elf_Shdr const *const relhdr, /* reltype */
if (w(txthdr->sh_type) != SHT_PROGBITS ||
!(_w(txthdr->sh_flags) & SHF_EXECINSTR))
return NULL;
- return txtname;
+ return shdr0->sh_size ? txtname : NULL;
}
static char const *has_rel_mcount(Elf_Shdr const *const relhdr,
next prev parent reply other threads:[~2021-02-15 21:23 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-14 22:04 [PATCH] objtool: Fix seg fault with Clang non-section symbols Josh Poimboeuf
2020-12-16 12:48 ` Miroslav Benes
2020-12-16 13:49 ` [tip: objtool/urgent] " tip-bot2 for Josh Poimboeuf
2021-02-11 13:32 ` Xi Ruoyao
2021-02-11 13:55 ` Greg Kroah-Hartman
2021-02-11 18:46 ` Nick Desaulniers
2021-02-12 9:40 ` Xi Ruoyao
2021-02-12 15:30 ` Greg Kroah-Hartman
2021-02-12 17:07 ` Josh Poimboeuf
2021-02-12 17:45 ` Steven Rostedt
2021-02-13 14:09 ` Greg Kroah-Hartman
2021-02-13 14:13 ` Steven Rostedt
2021-02-13 15:52 ` Josh Poimboeuf
2021-02-13 16:25 ` Greg Kroah-Hartman
2021-02-14 15:51 ` Josh Poimboeuf
2021-02-15 14:53 ` Steven Rostedt
2021-02-15 15:58 ` Josh Poimboeuf
2021-02-15 21:22 ` Steven Rostedt [this message]
2021-02-13 13:00 ` Greg Kroah-Hartman
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