From: ebiederm@xmission.com (Eric W. Biederman)
To: Amerigo Wang <amwang@redhat.com>
Cc: Neil Horman <nhorman@redhat.com>,
linux-kernel@vger.kernel.org, tony.luck@intel.com,
linux-ia64@vger.kernel.org, akpm@linux-foundation.org,
Ingo Molnar <mingo@elte.hu>,
Anton Vorontsov <avorontsov@ru.mvista.com>
Subject: Re: [Patch 0/7] Implement crashkernel=auto
Date: Thu, 06 Aug 2009 03:51:58 +0000 [thread overview]
Message-ID: <m1ljlxsiox.fsf@fess.ebiederm.org> (raw)
In-Reply-To: <4A7A506B.2060008@redhat.com> (Amerigo Wang's message of "Thu\, 06 Aug 2009 11\:39\:23 +0800")
Amerigo Wang <amwang@redhat.com> writes:
>> No the crashdump mechanism is useless because user space is already
>> broken and unusable.
>
> Again, why broken?
To get a stock stat drive by hand I had to list about 5 kernel modules
in the right magic order in /etc/kdump.conf
Neither mount by label or mount by uuid when specified in /etc/kdump.conf
I had to hack mkdumprd to get an initrd that even finds the proper disk
to mount.
Short version it takes a huge amount of expertise to get what ships with
fedora to pass the trivial alt-sysrq-c test. It would probably be about
as easy to write you own custom initrd by hand.
Eric
WARNING: multiple messages have this Message-ID (diff)
From: ebiederm@xmission.com (Eric W. Biederman)
To: Amerigo Wang <amwang@redhat.com>
Cc: Neil Horman <nhorman@redhat.com>,
linux-kernel@vger.kernel.org, tony.luck@intel.com,
linux-ia64@vger.kernel.org, akpm@linux-foundation.org,
Ingo Molnar <mingo@elte.hu>,
Anton Vorontsov <avorontsov@ru.mvista.com>
Subject: Re: [Patch 0/7] Implement crashkernel=auto
Date: Wed, 05 Aug 2009 20:51:58 -0700 [thread overview]
Message-ID: <m1ljlxsiox.fsf@fess.ebiederm.org> (raw)
In-Reply-To: <4A7A506B.2060008@redhat.com> (Amerigo Wang's message of "Thu\, 06 Aug 2009 11\:39\:23 +0800")
Amerigo Wang <amwang@redhat.com> writes:
>> No the crashdump mechanism is useless because user space is already
>> broken and unusable.
>
> Again, why broken?
To get a stock stat drive by hand I had to list about 5 kernel modules
in the right magic order in /etc/kdump.conf
Neither mount by label or mount by uuid when specified in /etc/kdump.conf
I had to hack mkdumprd to get an initrd that even finds the proper disk
to mount.
Short version it takes a huge amount of expertise to get what ships with
fedora to pass the trivial alt-sysrq-c test. It would probably be about
as easy to write you own custom initrd by hand.
Eric
next prev parent reply other threads:[~2009-08-06 3:51 UTC|newest]
Thread overview: 99+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-05 11:19 [Patch 0/7] Implement crashkernel=auto Amerigo Wang
2009-08-05 11:19 ` Amerigo Wang
2009-08-05 11:19 ` [Patch 1/7] x86: add CONFIG_KEXEC_AUTO_RESERVE Amerigo Wang
2009-08-05 11:19 ` Amerigo Wang
2009-08-05 13:41 ` Neil Horman
2009-08-05 13:41 ` Neil Horman
2009-08-05 14:45 ` Andi Kleen
2009-08-05 14:45 ` Andi Kleen
2009-08-05 20:07 ` Eric W. Biederman
2009-08-05 20:07 ` Eric W. Biederman
2009-08-06 1:55 ` Amerigo Wang
2009-08-06 1:55 ` Amerigo Wang
2009-08-06 7:15 ` Andi Kleen
2009-08-06 7:15 ` Andi Kleen
2009-08-06 7:44 ` Amerigo Wang
2009-08-06 7:44 ` Amerigo Wang
2009-08-06 7:56 ` Amerigo Wang
2009-08-06 7:56 ` Amerigo Wang
2009-08-05 11:19 ` [Patch 2/7] x86: implement crashkernel=auto Amerigo Wang
2009-08-05 11:19 ` Amerigo Wang
2009-08-05 13:43 ` Neil Horman
2009-08-05 13:43 ` Neil Horman
2009-08-06 1:45 ` Amerigo Wang
2009-08-06 1:45 ` Amerigo Wang
2009-08-05 22:51 ` Yu, Fenghua
2009-08-05 22:51 ` Yu, Fenghua
2009-08-06 1:56 ` Amerigo Wang
2009-08-06 1:56 ` Amerigo Wang
2009-08-05 11:19 ` [Patch 3/7] ia64: add CONFIG_KEXEC_AUTO_RESERVE Amerigo Wang
2009-08-05 11:19 ` Amerigo Wang
2009-08-05 13:49 ` Neil Horman
2009-08-05 13:49 ` Neil Horman
2009-08-05 11:19 ` [Patch 4/7] ia64: implement crashkernel=auto Amerigo Wang
2009-08-05 11:19 ` Amerigo Wang
2009-08-05 13:46 ` Neil Horman
2009-08-05 13:46 ` Neil Horman
2009-08-05 11:19 ` [Patch 5/7] powerpc: add CONFIG_KEXEC_AUTO_RESERVE Amerigo Wang
2009-08-05 11:19 ` Amerigo Wang
2009-08-05 13:49 ` Neil Horman
2009-08-05 13:49 ` Neil Horman
2009-08-05 11:20 ` [Patch 6/7] powerpc: implement crashkernel=auto Amerigo Wang
2009-08-05 11:20 ` Amerigo Wang
2009-08-05 13:50 ` Neil Horman
2009-08-05 13:50 ` Neil Horman
2009-08-05 11:20 ` [Patch 7/7] doc: update the kdump document Amerigo Wang
2009-08-05 11:20 ` Amerigo Wang
2009-08-05 13:33 ` [Patch 0/7] Implement crashkernel=auto Eric W. Biederman
2009-08-05 13:33 ` Eric W. Biederman
2009-08-05 14:04 ` Neil Horman
2009-08-05 14:04 ` Neil Horman
2009-08-05 22:57 ` Eric W. Biederman
2009-08-05 22:57 ` Eric W. Biederman
2009-08-06 2:05 ` Amerigo Wang
2009-08-06 2:05 ` Amerigo Wang
2009-08-06 2:47 ` Eric W. Biederman
2009-08-06 2:47 ` Eric W. Biederman
2009-08-06 3:39 ` Amerigo Wang
2009-08-06 3:39 ` Amerigo Wang
2009-08-06 3:51 ` Eric W. Biederman [this message]
2009-08-06 3:51 ` Eric W. Biederman
2009-08-06 5:57 ` Amerigo Wang
2009-08-06 5:57 ` Amerigo Wang
2009-08-06 6:14 ` Eric W. Biederman
2009-08-06 6:14 ` Eric W. Biederman
2009-08-06 6:37 ` Amerigo Wang
2009-08-06 6:37 ` Amerigo Wang
2009-08-06 8:35 ` Eric W. Biederman
2009-08-06 8:35 ` Eric W. Biederman
2009-08-06 8:47 ` Eric W. Biederman
2009-08-06 8:47 ` Eric W. Biederman
2009-08-06 9:04 ` Amerigo Wang
2009-08-06 9:04 ` Amerigo Wang
2009-08-07 19:13 ` Bernhard Walle
2009-08-07 19:13 ` Bernhard Walle
2009-08-06 9:11 ` Amerigo Wang
2009-08-06 9:11 ` Amerigo Wang
2009-08-07 19:50 ` Eric W. Biederman
2009-08-07 19:50 ` Eric W. Biederman
2009-08-07 19:50 ` Eric W. Biederman
2009-08-07 21:03 ` Andi Kleen
2009-08-07 21:03 ` Andi Kleen
2009-08-07 21:03 ` Andi Kleen
2009-08-07 21:26 ` Bernhard Walle
2009-08-07 21:26 ` Bernhard Walle
2009-08-07 21:26 ` Bernhard Walle
2009-08-07 22:06 ` Eric W. Biederman
2009-08-07 22:06 ` Eric W. Biederman
2009-08-07 22:06 ` Eric W. Biederman
2009-08-07 21:31 ` Bernhard Walle
2009-08-07 21:31 ` Bernhard Walle
2009-08-07 21:31 ` Bernhard Walle
2009-08-07 22:16 ` Eric W. Biederman
2009-08-07 22:16 ` Eric W. Biederman
2009-08-07 22:16 ` Eric W. Biederman
2009-08-10 3:11 ` Amerigo Wang
2009-08-10 3:11 ` Amerigo Wang
2009-08-10 3:11 ` Amerigo Wang
2009-08-06 1:39 ` Amerigo Wang
2009-08-06 1:39 ` Amerigo Wang
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