linux-kernel - Re: [PATCH-4.19-stable 0/2] Backport ENCODE_FRAME

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Date:   Thu, 13 Feb 2020 07:01:56 -0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Dmitry Safonov <dima@...sta.com>
Cc:     linux-kernel@...r.kernel.org,
        Dmitry Safonov <0x7f454c46@...il.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH-4.19-stable 0/2] Backport ENCODE_FRAME_POINTER hint

On Mon, Feb 10, 2020 at 02:05:41PM +0000, Dmitry Safonov wrote:
> On 4.19.93 the following warning was observed with CONFIG_FRAME_POINTER:
> > WARNING: kernel stack frame pointer at 00000000bceb5183 in Coronavirus:3282 has bad value           (null)
> >  unwind stack type:0 next_sp:          (null) mask:0x2 graph_idx:0
> >  000000009630aa47: ffffc9000126fdb0 (0xffffc9000126fdb0)
> >  0000000020360f53: ffffffff81038e33 (__save_stack_trace+0xcb/0xee)
> >  00000000675081f2: 0000000000000000 ...
> >  0000000043198fe7: ffffc9000126c000 (0xffffc9000126c000)
> >  0000000008a46231: ffffc90001270000 (0xffffc90001270000)
> [..]
> 
> It turns to be missing %rbp hint was making frame pointer unwinder
> a bit tipsy.
> The observed is WARN_ONCE(), so it one time per boot, but imho, worth to
> have in stable too.

All now queued up, thanks!

greg k-h