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Message-ID: <CAHhAz+hw251beDeaWRFV7oShngSQ_KAACXAzb45EZRBdZ3kbSg@mail.gmail.com>
Date: Fri, 11 Oct 2019 19:33:38 +0530
From: Muni Sekhar <munisekharrms@...il.com>
To: Kees Cook <keescook@...omium.org>
Cc: kernel-hardening@...ts.openwall.com
Subject: Re: How to get the crash dump if system hangs?
On Fri, Oct 11, 2019 at 12:01 AM Kees Cook <keescook@...omium.org> wrote:
>
> On Thu, Oct 10, 2019 at 10:45:21PM +0530, Muni Sekhar wrote:
> > I'm using Ubuntu distro, ran "reboot" command but after reboot
> > console-ramoops-0 is not present in /sys/fs/pstore
>
> Hmpf. Well, then, I guess your boot firmware is pretty aggressive about
> wiping RAM across boots. :(
>
> There was a patch set to store to disk, but I haven't seen a recent
> version of it, if you want to go that route[1].
>
> -Kees
>
> [1] https://lore.kernel.org/lkml/1551922630-27548-1-git-send-email-liaoweixiong@allwinnertech.com/
Thanks I will check it out.
While loading ramoops I see "persistent_ram: uncorrectable error in
header", is this harmful?
[ 270.864969] ramoops: using module parameters
[ 270.866651] persistent_ram: uncorrectable error in header
[ 270.867252] persistent_ram: uncorrectable error in header
[ 270.867728] persistent_ram: uncorrectable error in header
[ 270.868067] persistent_ram: uncorrectable error in header
[ 270.868492] persistent_ram: uncorrectable error in header
[ 270.868839] persistent_ram: uncorrectable error in header
[ 270.869209] persistent_ram: uncorrectable error in header
[ 270.869681] persistent_ram: uncorrectable error in header
[ 270.870026] persistent_ram: uncorrectable error in header
[ 270.870430] persistent_ram: uncorrectable error in header
[ 270.870774] persistent_ram: uncorrectable error in header
[ 270.871110] persistent_ram: uncorrectable error in header
[ 270.871687] persistent_ram: uncorrectable error in header
[ 270.872055] persistent_ram: uncorrectable error in header
[ 270.872567] persistent_ram: uncorrectable error in header
[ 270.872910] persistent_ram: uncorrectable error in header
[ 270.873243] persistent_ram: uncorrectable error in header
[ 270.873592] persistent_ram: uncorrectable error in header
[ 270.873932] persistent_ram: uncorrectable error in header
[ 270.874267] persistent_ram: uncorrectable error in header
[ 270.874614] persistent_ram: uncorrectable error in header
[ 270.874958] persistent_ram: uncorrectable error in header
[ 270.875300] persistent_ram: uncorrectable error in header
[ 270.875686] persistent_ram: uncorrectable error in header
[ 270.876028] persistent_ram: uncorrectable error in header
[ 270.876462] persistent_ram: uncorrectable error in header
[ 270.876808] persistent_ram: uncorrectable error in header
[ 270.877144] persistent_ram: uncorrectable error in header
[ 270.877519] persistent_ram: uncorrectable error in header
[ 270.877860] persistent_ram: uncorrectable error in header
[ 270.878199] persistent_ram: uncorrectable error in header
[ 270.878565] persistent_ram: uncorrectable error in header
[ 270.878916] persistent_ram: uncorrectable error in header
[ 270.881129] console [pstore-1] enabled
[ 270.884817] pstore: Registered ramoops as persistent store backend
[ 270.885232] ramoops: attached 0x100000@...ff00000, ecc: 16/0
>
> --
> Kees Cook
--
Thanks,
Sekhar
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