Crash package on Oracle UEK kernel

Kdump is the Linux kernel crash-dump mechanism and Oracle recommends that you enabled it. You can configure Kdump using system-config-kdump utility.

So, if you are running Oracle Enterprise Linux UEK kernel and have faced a kernel panic, follow the steps below to install crash utility and analyse the vmcore file.

To use crash, packages debuginfo and debuginfo-common must also be installed.

To install packages on OL7 run:

yum install crash -y

export DLP="https://oss.oracle.com/ol7/debuginfo"

wget ${DLP}/kernel-uek-debuginfo-`uname -r`.rpm
wget ${DLP}/kernel-uek-debuginfo-common-`uname -r`.rpm

yum install kernel-uek-debuginfo*

Running crash:

syntax: crash <vmcore> <vmlinux>

crash vmcore /usr/lib/debug/lib/modules/`uname -r`/vmlinux

You will find vmcore files under /var/crash/<127.0.0.1-TIMESTAMP>

Output example:

[root@machine 127.0.0.1-2020-01-26-20:29:08]# crash vmcore /usr/lib/debug/lib/modules/4.1.12-124.35.2.el7uek.x86_64/vmlinux
crash 7.2.3-10.el7
Copyright (C) 2002-2017 Red Hat, Inc.
Copyright (C) 2004, 2005, 2006, 2010 IBM Corporation
Copyright (C) 1999-2006 Hewlett-Packard Co
Copyright (C) 2005, 2006, 2011, 2012 Fujitsu Limited
Copyright (C) 2006, 2007 VA Linux Systems Japan K.K.
Copyright (C) 2005, 2011 NEC Corporation
Copyright (C) 1999, 2002, 2007 Silicon Graphics, Inc.
Copyright (C) 1999, 2000, 2001, 2002 Mission Critical Linux, Inc.
This program is free software, covered by the GNU General Public License,
and you are welcome to change it and/or distribute copies of it under
certain conditions. Enter "help copying" to see the conditions.
This program has absolutely no warranty. Enter "help warranty" for details.

GNU gdb (GDB) 7.6
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later http://gnu.org/licenses/gpl.html
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-unknown-linux-gnu"…

KERNEL: /usr/lib/debug/lib/modules/4.1.12-124.35.2.el7uek.x86_64/vmlinux
DUMPFILE: vmcore [PARTIAL DUMP]
LOAD AVERAGE: 0.88, 0.26, 0.18
TASKS: 366
NODENAME: machine
RELEASE: 4.1.12-124.35.2.el7uek.x86_64
VERSION: #2 SMP Mon Jan 13 16:42:30 PST 2020
MACHINE: x86_64 (3400 Mhz)
MEMORY: 15.7 GB
PANIC: "BUG: unable to handle kernel NULL pointer dereference at 0000000000000030"
PID: 24893
COMMAND: "oracle_24893_ic"
TASK: ffff880168877000 [THREAD_INFO: ffff8801a6eb8000]
CPU: 0
STATE: TASK_RUNNING (PANIC)

Author: reguchi

Oracle ACE, OCP 12c, OCE 12c MAA, OCE Exadata, RHCE, AWS CSAA, OCI CSAA. Technology geek, homebrewer, dad.

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