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From:   David Laight <David.Laight@ACULAB.COM>
To:     'Stephen Boyd' <swboyd@chromium.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Petr Mladek <pmladek@suse.com>
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Subject: RE: [PATCH v6 00/13] Add build ID to stacktraces
Thread-Topic: [PATCH v6 00/13] Add build ID to stacktraces
Thread-Index: AQHXRf4HnT90HedmH0WFx6bjKadex6reN/jQ
Date:   Tue, 11 May 2021 12:36:06 +0000
Message-ID: <b30f6d396edf4db5974a2b90364b6314@AcuMS.aculab.com>
References: <20210511003845.2429846-1-swboyd@chromium.org>
In-Reply-To: <20210511003845.2429846-1-swboyd@chromium.org>
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From: Stephen Boyd
> Sent: 11 May 2021 01:39
> 
> This series adds the kernel's build ID[1] to the stacktrace header
> printed in oops messages, warnings, etc. and the build ID for any module
> that appears in the stacktrace after the module name. The goal is to
> make the stacktrace more self-contained and descriptive by including the
> relevant build IDs in the kernel logs when something goes wrong. This
> can be used by post processing tools like script/decode_stacktrace.sh
> and kernel developers to easily locate the debug info associated with a
> kernel crash and line up what line and file things started falling apart
> at.
> 
> To show how this can be used I've included a patch to
> decode_stacktrace.sh that downloads the debuginfo from a debuginfod
> server. 
...
> Here's an example lkdtm stacktrace on arm64.
> 
>  WARNING: CPU: 4 PID: 3255 at drivers/misc/lkdtm/bugs.c:83 lkdtm_WARNING+0x28/0x30 [lkdtm]
>  Modules linked in: lkdtm rfcomm algif_hash algif_skcipher af_alg xt_cgroup uinput xt_MASQUERADE
>  CPU: 4 PID: 3255 Comm: bash Not tainted 5.11 #3 aa23f7a1231c229de205662d5a9e0d4c580f19a1
>  Hardware name: Google Lazor (rev3+) with KB Backlight (DT)
...
>  x1 : ffffff93fef15788 x0 : ffffffe3622352e0
>  Call trace:
>   lkdtm_WARNING+0x28/0x30 [lkdtm ed5019fdf5e53be37cb1ba7899292d7e143b259e]
>   direct_entry+0x16c/0x1b4 [lkdtm ed5019fdf5e53be37cb1ba7899292d7e143b259e]
>   full_proxy_write+0x74/0xa4

Is there any way to get it to print each module ID only once?

	David

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