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From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Dave Young <dyoung@redhat.com>,
bhe@redhat.com, Eric Biederman <ebiederm@xmission.com>,
linux-kernel@vger.kernel.org, kexec@lists.infradead.org,
Eric DeVolder <eric.devolder@oracle.com>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>
Subject: Re: [PATCH] Only allow to set crash_kexec_post_notifiers on boot time
Date: Mon, 21 Sep 2020 16:18:12 -0400 [thread overview]
Message-ID: <20200921201811.GB3437@char.us.oracle.com> (raw)
In-Reply-To: <20200918174743.0994c59f058451948837dcb6@linux-foundation.org>
On Fri, Sep 18, 2020 at 05:47:43PM -0700, Andrew Morton wrote:
> On Fri, 18 Sep 2020 11:25:46 +0800 Dave Young <dyoung@redhat.com> wrote:
>
> > crash_kexec_post_notifiers enables running various panic notifier
> > before kdump kernel booting. This increases risks of kdump failure.
> > It is well documented in kernel-parameters.txt. We do not suggest
> > people to enable it together with kdump unless he/she is really sure.
> > This is also not suggested to be enabled by default when users are
> > not aware in distributions.
> >
> > But unfortunately it is enabled by default in systemd, see below
> > discussions in a systemd report, we can not convince systemd to change
> > it:
> > https://github.com/systemd/systemd/issues/16661
> >
> > Actually we have got reports about kdump kernel hangs in both s390x
> > and powerpcle cases caused by the systemd change, also some x86 cases
> > could also be caused by the same (although that is in Hyper-V code
> > instead of systemd, that need to be addressed separately).
Perhaps it may be better to fix the issus on s390x and PowerPC as well?
> >
> > Thus to avoid the auto enablement here just disable the param writable
> > permission in sysfs.
> >
>
> Well. I don't think this is at all a desirable way of resolving a
> disagreement with the systemd developers
>
> At the above github address I'm seeing "ryncsn added a commit to
> ryncsn/systemd that referenced this issue 9 days ago", "pstore: don't
> enable crash_kexec_post_notifiers by default". So didn't that address
> the issue?
It does in systemd, but there is a strong interest in making this on by default.
next prev parent reply other threads:[~2020-09-21 20:16 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-18 3:25 Dave Young
2020-09-19 0:47 ` Andrew Morton
2020-09-19 7:26 ` Dave Young
2020-09-21 20:18 ` Konrad Rzeszutek Wilk [this message]
2020-09-22 1:45 ` Eric W. Biederman
2020-09-23 2:43 ` Dave Young
2020-09-23 15:48 ` Konrad Rzeszutek Wilk
2020-09-24 16:15 ` Michael Kelley
2020-09-24 16:25 ` Eric W. Biederman
2020-09-24 16:43 ` Michael Kelley
2020-09-24 17:16 ` boris.ostrovsky
2020-09-25 3:05 ` Dave Young
2020-09-25 14:56 ` Konrad Rzeszutek Wilk
2020-09-27 2:51 ` Dave Young
2020-09-29 13:36 ` Philipp Rudo
2020-09-29 19:10 ` boris.ostrovsky
2020-09-22 10:58 ` Philipp Rudo
2020-09-22 14:50 ` boris.ostrovsky
2020-09-22 17:04 ` Guilherme G. Piccoli
2020-09-23 2:25 ` Dave Young
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