linux-kernel - Re: [PATCH] mce: fix missing stack-dumping in mce

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Message-ID: <44690ad8-1531-f6f3-9450-ef4d42ceec07@huawei.com>
Date:   Mon, 9 Jan 2023 14:54:57 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     "Luck, Tony" <tony.luck@...el.com>
CC:     "x86@...nel.org" <x86@...nel.org>, "hpa@...or.com" <hpa@...or.com>,
        "linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH] mce: fix missing stack-dumping in mce_panic()

On 2023/1/9 12:45, Luck, Tony wrote:
>>> Maybe then I can look at some way to suppress the oops dump for the "useless"
>>> cases? Or perhaps at least add an extra message that stack dumps from arbitrary
>>> machine checks are rarely useful.
>>
>> IMHO the user will always expect a stack dump when system panic. I'm afraid that if these
>> "useless" cases are eliminated, it will cause user confused and trying to find what eats
>> the stack dump?
> 
> What about the "extra message" option?  Always print the full oops. but for ones from
> mce_panic() arrange somehow to add an extra bit of helpful text. Something like this:
> 
> 1) For poison consumption in kernel code:
> 
> "The reason for this panic is consumption of poisoned data by the kernel"
> 
> 2) For the general machine check case:
> 
> "The reason for this panic is a hardware detected error reported as a machine check.
>  Note that the stack and register dumps are likely useless to diagnose the root cause
>  of this panic."

It sounds like a good idea to me. Many thanks for your thought. And it's fine to squash my patch
to your provided thought. :)

Thanks,
Miaohe Lin