linux-kernel - Re: faddr2line issue

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Date:   Thu, 21 Jul 2022 16:03:05 +0100
From:   John Garry <john.garry@...wei.com>
To:     Josh Poimboeuf <jpoimboe@...nel.org>
CC:     <keescook@...omium.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: faddr2line issue

On 21/07/2022 00:32, Josh Poimboeuf wrote:
> On Wed, Jul 20, 2022 at 09:39:42AM +0100, John Garry wrote:
>> On 20/07/2022 01:06, Josh Poimboeuf wrote:
>>>> 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?
>>
>> ah, it's just a wrapper to call scripts/faddr2line with vmlinux and $1
>> (being hisi_sas_sata_done+0x8/0x38, above) args
>>
>>> Does addr2line also fail?
>>
>> faddr2line fails, as below.
>>
>>>
>>> Can you run
>>>
>>>     bash -x scripts/faddr2line <vmlinux or .ko file> hisi_sas_sata_done+0x8/0x38
>>>
>>> and share the output?
>>
>> on rc3 we get:
>>
>> https://raw.githubusercontent.com/hisilicon/kernel-dev/private-topic-sas-5.19-faddr2line-linux-rc3/before2
> 
> Does this fix it?
> 
> diff --git a/scripts/faddr2line b/scripts/faddr2line
> index 94ed98dd899f..57099687e5e1 100755
> --- a/scripts/faddr2line
> +++ b/scripts/faddr2line
> @@ -112,7 +112,9 @@ __faddr2line() {
>   	# section offsets.
>   	local file_type=$(${READELF} --file-header $objfile |
>   		${AWK} '$1 == "Type:" { print $2; exit }')
> -	[[ $file_type = "EXEC" ]] && is_vmlinux=1
> +	if [[ $file_type = "EXEC" ]] || [[ $file_type == "DYN" ]]; then
> +		is_vmlinux=1
> +	fi
>   
>   	# Go through each of the object's symbols which match the func name.
>   	# In rare cases there might be duplicates, in which case we print all
> .

Yeah, looks ok now.

Tested-by: John Garry <john.garry@...wei.com>

thanks