linux-kernel - Re: kernel panic due to https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=2830bf6f05fb3e05bc4743274b806c821807a684

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Message-ID: <CAHk-=wh-1wB_X2MG0vW5e755rWJ5pBN8yyXLo2syOdcMV6qYoQ@mail.gmail.com>
Date:   Fri, 25 Jan 2019 17:48:32 +1300
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     robert shteynfeld <robert.shteynfeld@...il.com>,
        Mikhail Zaslonko <zaslonko@...ux.ibm.com>
Cc:     Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        Gerald Schaefer <gerald.schaefer@...ibm.com>,
        Michal Hocko <mhocko@...nel.org>,
        Mikhail Gavrilov <mikhail.v.gavrilov@...il.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Alexander Duyck <alexander.h.duyck@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Pavel Tatashin <pasha.tatashin@...cle.com>,
        Steven Sistare <steven.sistare@...cle.com>,
        Daniel Jordan <daniel.m.jordan@...cle.com>,
        Bob Picco <bob.picco@...cle.com>
Subject: Re: kernel panic due to https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=2830bf6f05fb3e05bc4743274b806c821807a684

[ Just adding a lot of other people to the cc ]

Robert, could you add a dmesg of a successful boot to that bugzilla,
or just as an attachement in email to this group of people..

This looks to be with the Fedora kernel config. Two people reporting
it, it looks like similar machines.

I assume it's some odd memory sizing detail that happens to trigger a
particular case.

I absolutely *hate* those "let's lazily clear 'struct page' array"
patches. They've caused problems before, and I'm not convinced the
pain has been worth it. Maybe we should revert them (again) and
promise to never ever take things like that again? Andrew?

                  Linus

On Fri, Jan 25, 2019 at 3:21 AM robert shteynfeld
<robert.shteynfeld@...il.com> wrote:
>
> Hi,
>
> It looks like the above commit is causing an early kernel panic during boot on my system starting with kernel 4.19.13.  Here's the redhat bug regarding this: https://bugzilla.redhat.com/show_bug.cgi?id=1666948.
>
> Cheers,
>
> Robert