Failure to crashdump under Centos-6.4 x86_64 with kernel 3.12.30

From: "Mr. Berkley Shands" <bshands@exegy.com>
To: kexec@lists.infradead.org
Subject: Failure to crashdump under Centos-6.4 x86_64 with kernel 3.12.30
Date: Thu, 22 Jan 2015 13:18:50 -0600	[thread overview]
Message-ID: <54C14D1A.1020307@exegy.com> (raw)

My kernel crashdumps don't work with vanilla 3.12.30 on a 256GB x86_64
intel box.
Centos-6.4. With the standard makedumpfile, makedumpfile segfaults, and
no output is written to disk.
with makedumpfile 1.5.7, kexec-tools-2.0.8, and crash 7.0.2 I actually
get vmcore files,
but then crash rejects them with:

crash vmcore /boot/vmlinux-3.12.30

crash 7.0.2
...
GNU gdb (GDB) 7.6
...

crash: seek error: kernel virtual address: ffff88207fffcb60  type:
"pglist node_id"

the grub entry for this kernel is:
     kernel /boot/vmlinuz-3.12.30 ro root=LABEL=ROOT
numa_balancing=disable intel_idle.max_cstate=0 processor.max_cstate=0
mce=ignore_mce clocksource=tsc nohz=off nomodeset nodmraid rd_NO_LUKS
rd_NO_LVM rd_NO_MD rd_NO_DM LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16
KEYBOARDTYPE=pc KEYTABLE=us crashkernel=256M@256M  console=ttyS1,115200n8

CONFIG_CRASH_DUMP=y
CONFIG_KEXEC_JUMP=y
CONFIG_PHYSICAL_START=0x2000000
CONFIG_RELOCATABLE=y
CONFIG_PHYSICAL_ALIGN=0x1000000

A similar issue appears with a grub crashkernel=128M@32M

Turning off all the makedumpfile exclusions (dump all pages) results in
a much larger
vmcore, but it still gets the same failures.

Where do I start looking for the problems here?
kernel 3.10.65 won't dump either, but an old 3.0.29 kernel dumps just fine.
Is this a problem with some .config setting?

Berkley

--

//E. F. Berkley Shands, MSc
Senior Software Architect/Engineer
Exegy Systems Engineering//

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