linux-kernel - Re: faddr2line issue

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Message-ID: <3492d341-a681-f344-f5cd-5b1ea3725f31@huawei.com>
Date:   Thu, 14 Jul 2022 10:57:51 +0100
From:   John Garry <john.garry@...wei.com>
To:     <jpoimboe@...nel.org>, <keescook@...omium.org>
CC:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: faddr2line issue

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?

Thanks,
John

> Hi Josh,
> 
> I am finding that for a few mainline kernel releases that faddr2line 
> does seem to be working:
> 
> ./scripts/faddr2line vmlinux  sas_discover_domain+0x4dc/0x560
> sas_discover_domain+0x4dc/0x560:
> fs mm ??:0
> 
> This is on my arm64 system. I have not tried another arch. Are there any 
> known issues?
> 
> Maybe I'm using it incorrectly... I can go back and see when this 
> stopped working for me.
> 
> Cheers,
> John