linux-kernel - Re: [PATCH v3 9/9] powerpc/traps: Add line prefix in show

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Message-ID: <87ftzyfa1y.fsf@concordia.ellerman.id.au>
Date:   Thu, 02 Aug 2018 00:14:49 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Christophe LEROY <christophe.leroy@....fr>,
        Murilo Opsfelder Araujo <muriloo@...ux.ibm.com>,
        linux-kernel@...r.kernel.org
Cc:     Alastair D'Silva <alastair@...ilva.org>,
        Andrew Donnellan <andrew.donnellan@....ibm.com>,
        Balbir Singh <bsingharora@...il.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Cyril Bur <cyrilbur@...il.com>,
        "Eric W . Biederman" <ebiederm@...ssion.com>,
        Joe Perches <joe@...ches.com>,
        Michael Neuling <mikey@...ling.org>,
        Nicholas Piggin <npiggin@...il.com>,
        Paul Mackerras <paulus@...ba.org>,
        Simon Guo <wei.guo.simon@...il.com>,
        Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>,
        "Tobin C . Harding" <me@...in.cc>, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v3 9/9] powerpc/traps: Add line prefix in show_instructions()

Christophe LEROY <christophe.leroy@....fr> writes:

> Le 31/07/2018 à 16:50, Murilo Opsfelder Araujo a écrit :
>> Remove "Instruction dump:" line by adding a prefix to display current->comm
>> and current->pid, along with the instructions dump.
>> 
>> The prefix can serve as a glue that links the instructions dump to its
>> originator, allowing messages to be interleaved in the logs.
>> 
>> Before this patch, a page fault looked like:
>> 
>>    pandafault[10524]: segfault (11) at 100007d0 nip 1000061c lr 7fffbd295100 code 2 in pandafault[10000000+10000]
>>    Instruction dump:
>>    4bfffeec 4bfffee8 3c401002 38427f00 fbe1fff8 f821ffc1 7c3f0b78 3d22fffe
>>    392988d0 f93f0020 e93f0020 39400048 <99490000> 39200000 7d234b78 383f0040
>> 
>> After this patch, it looks like:
>> 
>>    pandafault[10850]: segfault (11) at 100007d0 nip 1000061c lr 7fff9f3e5100 code 2 in pandafault[10000000+10000]
>>    pandafault[10850]: code: 4bfffeec 4bfffee8 3c401002 38427f00 fbe1fff8 f821ffc1 7c3f0b78 3d22fffe
>>    pandafault[10850]: code: 392988d0 f93f0020 e93f0020 39400048 <99490000> 39200000 7d234b78 383f0040
>> 
>> Signed-off-by: Murilo Opsfelder Araujo <muriloo@...ux.ibm.com>
>
> Does the script scripts/decode_stacktrace.sh also works with this format 
> change ?

Did it work before? I've never used it.

Would be great if it did work though.

cheers