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

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Message-ID: <11536111-f702-86e2-6b0e-af3bf6367913@suse.cz>
Date:   Tue, 17 Jan 2017 14:08:35 +0100
From:   Jiri Slaby <jslaby@...e.cz>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     Miroslav Benes <mbenes@...e.cz>, 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 12/01/2016, 09:59 PM, Josh Poimboeuf wrote:
> I honestly am planning on picking it back up as soon as I post the
> consistency model v3, probably next week.
> 
> Here's its current state, though it ain't pretty:
> 
>   https://github.com/jpoimboe/linux/tree/objtool-dwarf

FWIW, I had to port the SUSE's in-kernel DWARF unwinder which we drag
for a decade or so. It seems to be working correctly on the top of the
rewritten 4.9 stack unwinding. It needs a lot of polishing, though. And
it does not go beyond a single stack (e.g. from IRQ to process ctx) yet
(it never did).

https://git.kernel.org/cgit/linux/kernel/git/jirislaby/linux.git/commit/?h=devel&id=b190fa08c9248846e9cf23959f0484215d3ad0e4

Having the working DWARF unwinder, I am moving to DWARF generation for
asm in your tool now.

thanks,
-- 
js
suse labs