From: Seiji Aguchi <seiji.aguchi@hds.com>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Borislav Petkov <bp@alien8.de>, Andi Kleen <andi@firstfloor.org>,
"rdunlap@xenotime.net" <rdunlap@xenotime.net>,
"tglx@linutronix.de" <tglx@linutronix.de>,
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<dle-develop@lists.sourceforge.net>,
Satoru Moriya <satoru.moriya@hds.com>
Subject: RE: [RFC][PATCH] Add a sysctl option controlling kexec when MCE occurred
Date: Sat, 25 Dec 2010 09:56:50 -0500 [thread overview]
Message-ID: <5C4C569E8A4B9B42A84A977CF070A35B2C132F6CFA@USINDEVS01.corp.hds.com> (raw)
In-Reply-To: <m11v58xnyy.fsf@fess.ebiederm.org>
Hi,
Thank you for giving your comments.
>So what is the problem you are trying to avoid, and why can't we do
>something in the kernels initialization path to avoid initializing
>when there is a problem?
Kdump gets a dump disk identifier based on information from memory.
So, kdump may receive wrong identifier when it starts after MCE
occurred, because MCE is reported by memory, cache, and TLB errors
In the worst case, kdump will overwrite user data if it recognizes a
disk saving user data as a dump disk.
Kdump shouldn't write any data to disk when information from
hardware is incredible because saving user data is always first
priority.
Seiji
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next prev parent reply other threads:[~2010-12-25 15:24 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-22 23:35 Seiji Aguchi
2010-12-23 0:29 ` Greg KH
2010-12-23 7:43 ` Andi Kleen
2010-12-23 9:18 ` Borislav Petkov
2010-12-23 17:31 ` Seiji Aguchi
2010-12-23 19:56 ` Eric W. Biederman
2010-12-25 14:56 ` Seiji Aguchi [this message]
2010-12-25 17:19 ` Eric W. Biederman
2010-12-25 18:33 ` H. Peter Anvin
2010-12-25 21:40 ` Eric W. Biederman
2010-12-27 1:56 ` Hidetoshi Seto
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