linux-kernel - Re: faddr2line issue

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Message-ID: <20220720000654.yospyvbrfliy3lrn@treble>
Date:   Tue, 19 Jul 2022 17:06:54 -0700
From:   Josh Poimboeuf <jpoimboe@...nel.org>
To:     John Garry <john.garry@...wei.com>
Cc:     keescook@...omium.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: faddr2line issue

On Tue, Jul 19, 2022 at 04:24:42PM +0100, John Garry wrote:
> On 14/07/2022 17:41, Josh Poimboeuf wrote:
> > On Thu, Jul 14, 2022 at 10:57:51AM +0100, John Garry wrote:
> > > On 08/07/2022 15:47, John Garry wrote:
> > > 
> > > +
> > > 
> > > JFYI, This issue is caused by CONFIG_DEBUG_INFO now being default off in my
> > > .config from commit f9b3cd245784 ("Kconfig.debug: make DEBUG_INFO selectable
> > > from a choice").
> > > 
> > > By enabling that config faddr2line now looks ok again.
> > > 
> > > BTW, Could we add a check for any kernel dependency in this tool?
> > Hi John,
> > 
> > The script doesn't know how to reliably find the .config file, but it
> > should be able to check for missing DWARF in the binary itself.
> 
> Hi Josh,
> 
> So adding config DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT to v5.19-rc2 got it
> working again for me on arm64. However commit dcea997beed6 ("faddr2line: Fix
> overlapping text section failures, the sequel") seems to be broken for me,
> below - this first appeared in rc3. Any idea what the issue could be?
> 
> $./faddr.sh hisi_sas_sata_done+0x8/0x38
> hisi_sas_sata_done+0x8/0x38:
> fs mm ??:0

Hm, what does faddr.sh do?  Does addr2line also fail?

Can you run

  bash -x scripts/faddr2line <vmlinux or .ko file> hisi_sas_sata_done+0x8/0x38

and share the output?

-- 
Josh