linux-kernel - Re: [PATCH v2 2/2] scripts/decode_stacktrace.sh: better support to ARM32 module stack trace

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Date: Wed, 22 May 2024 19:00:30 -0700
From: Elliot Berman <quic_eberman@...cinc.com>
To: Xiong Nandi <xndchn@...il.com>
CC: <akpm@...ux-foundation.org>, <linux-kernel@...r.kernel.org>,
        <quic_bjorande@...cinc.com>, <cmllamas@...gle.com>
Subject: Re: [PATCH v2 2/2] scripts/decode_stacktrace.sh: better support to
 ARM32 module stack trace

On Thu, May 23, 2024 at 09:03:18AM +0800, Xiong Nandi wrote:
> Sometimes there is special characters around module name in stack trace,
> such as ARM32 with BACKTRACE_VERBOSE in "(%pS)" format, such as:
> [<806e4845>] (dump_stack_lvl) from [<7f806013>] (hello_init+0x13/0x1000 [test])
> 
> After stripping other characters around "[module]", it can be finally decoded:
> (dump_stack_lvl) from hello_init (/foo/test.c:10) test
> 
> Signed-off-by: Xiong Nandi <xndchn@...il.com>
> ---
>  scripts/decode_stacktrace.sh | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/scripts/decode_stacktrace.sh b/scripts/decode_stacktrace.sh
> index 2bc3a54ffba5..324e4a6c260a 100755
> --- a/scripts/decode_stacktrace.sh
> +++ b/scripts/decode_stacktrace.sh
> @@ -283,8 +283,8 @@ handle_line() {
>  
>  	if [[ ${words[$last]} =~ \[([^]]+)\] ]]; then
>  		module=${words[$last]}
> -		module=${module#\[}
> -		module=${module%\]}
> +		module=${module#*\[}
> +		module=${module%\]*}

I think it'd be better to just remove the parenthesis similar to how is
done in the symbol name.

That is:

		module=${words[$last]}
		module=${module#\[}
		module=${module%\]}
		# some nice comment explaining only the closing paren is
		# need to be stripped
		module=${module%\)}
		modbuildid=${module#* }

>  		modbuildid=${module#* }
>  		module=${module% *}
>  		if [[ $modbuildid == $module ]]; then
> -- 
> 2.25.1
>