netdev - Re: CONFIG_DEBUG_INFO_SPLIT impacts on faddr2line

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Message-ID: <20171113214148.GP8522@tassilo.jf.intel.com>
Date:   Mon, 13 Nov 2017 13:41:48 -0800
From:   Andi Kleen <ak@...ux.intel.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Fengguang Wu <fengguang.wu@...el.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        Network Development <netdev@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        intel-wired-lan@...ts.osuosl.org, Michal Marek <mmarek@...e.cz>,
        Sam Ravnborg <sam@...nborg.org>,
        Dirk Gouders <dirk@...ders.net>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        kbuild test robot <lkp@...el.com>,
        "Zhang, Rui" <rui.zhang@...el.com>,
        "Lu, Aaron" <aaron.lu@...el.com>, "H.J. Lu" <hjl.tools@...il.com>
Subject: Re: CONFIG_DEBUG_INFO_SPLIT impacts on faddr2line

On Mon, Nov 13, 2017 at 12:56:31PM -0800, Linus Torvalds wrote:
> On Mon, Nov 13, 2017 at 12:10 PM, Andi Kleen <ak@...ux.intel.com> wrote:
> >
> > You're right. It works for line information, but strangely not for
> > inlines. I assume it can be fixed.
> 
> So I'm not 100% sure it's strictly a addr2line bug.

It seems to be broken for normal programs too

$ cat tinline.c

int i;

static inline int finline(void)
{
	i++;
}

main()
{
	finline();
}

$ gcc -O2 -gsplit-dwarf tinline.c
$ addr2line -i -e a.out 0x4003b0
/home/ak/tsrc/tinline.c:6
$ gcc -O2  -g tinline.c
$ addr2line -i -e a.out 0x4003b0
/home/ak/tsrc/tinline.c:6
/home/ak/tsrc/tinline.c:12
$

I filed https://sourceware.org/bugzilla/show_bug.cgi?id=22434


-Andi