linux-kernel - Re: [RFC PATCH v1.9 07/14] x86/stacktrace: add function for detecting reliable stack traces

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Message-ID: <570BB1AE.6090502@suse.cz>
Date:	Mon, 11 Apr 2016 16:16:14 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	Josh Poimboeuf <jpoimboe@...hat.com>,
	Miroslav Benes <mbenes@...e.cz>
Cc:	Jiri Kosina <jikos@...nel.org>, Jessica Yu <jeyu@...hat.com>,
	linux-kernel@...r.kernel.org, live-patching@...r.kernel.org,
	Vojtech Pavlik <vojtech@...e.com>
Subject: Re: [RFC PATCH v1.9 07/14] x86/stacktrace: add function for detecting
 reliable stack traces

On 04/04/2016, 07:54 PM, Josh Poimboeuf wrote:
> On Thu, Mar 31, 2016 at 03:03:16PM +0200, Miroslav Benes wrote:
>> On Fri, 25 Mar 2016, Josh Poimboeuf wrote:
>>
>>> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
>>> index 2dc18605..76274b8 100644
>>> --- a/arch/x86/Kconfig
>>> +++ b/arch/x86/Kconfig
>>> @@ -138,6 +138,7 @@ config X86
>>>  	select HAVE_PERF_REGS
>>>  	select HAVE_PERF_USER_STACK_DUMP
>>>  	select HAVE_REGS_AND_STACK_ACCESS_API
>>> +	select HAVE_RELIABLE_STACKTRACE		if X86_64 && FRAME_POINTER
>>
>> I understand we have to rely on frame pointer for now. Do you plan to 
>> switch to dwarf unwinder one day in the future? IOW is there a plan to 
>> implement dwarf stuff generation in objtool and then to have a dwarf-based 
>> stack unwinder upstream and to use it for live patching? 
> 
> Yes, adding DWARF validation and generation to objtool and creating a
> DWARF unwinder upstream are all planned, hopefully soon.

I may seem to be obtrusive, but here, I would like to offer my help
again. If you need any kind of help with the unwinder, I can definitely
help with that. Be it coding, testing, ideas discussion or anything else.

We had been using unwinder for over a decade in SUSE but it stopped
working for assembly recently (for obvious reasons). So having a working
and reliable unwinder again is one of the top priorities for us.

thanks,
-- 
js
suse labs



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