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

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Date:   Wed, 28 Dec 2022 20:33:31 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     <bp@...en8.de>, <tglx@...utronix.de>, <mingo@...hat.com>,
        <dave.hansen@...ux.intel.com>, "hpa@...or.com" <hpa@...or.com>
CC:     <x86@...nel.org>, <linux-edac@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Tony Luck <tony.luck@...el.com>
Subject: Re: [PATCH] mce: fix missing stack-dumping in mce_panic()

On 2022/12/10 10:28, Miaohe Lin wrote:
> On 2022/12/3 0:37, Miaohe Lin wrote:
>> When machine check exception occurs, there is no stack-dumping now in
>> mce_panic(). It's because bust_spinlocks(1) is called prematurely so
>> oops_in_progress will be >= 2 when trying to call dump_stack() in
>> panic(). Thus dump_stack() won't be called as this is considered as
>> nested stack-dumping.
>>
>> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
> 
> Friendly ping. ;)

Friendly ping after busy merge window. :)

> 
>> ---
>>  arch/x86/kernel/cpu/mce/core.c | 1 -
>>  1 file changed, 1 deletion(-)
>>
>> diff --git a/arch/x86/kernel/cpu/mce/core.c b/arch/x86/kernel/cpu/mce/core.c
>> index 2c8ec5c71712..c40dad1a6749 100644
>> --- a/arch/x86/kernel/cpu/mce/core.c
>> +++ b/arch/x86/kernel/cpu/mce/core.c
>> @@ -254,7 +254,6 @@ static noinstr void mce_panic(const char *msg, struct mce *final, char *exp)
>>  			wait_for_panic();
>>  		barrier();
>>  
>> -		bust_spinlocks(1);
>>  		console_verbose();
>>  	} else {
>>  		/* Don't log too much for fake panic */
>>
>