Re: [Crash-utility] How does crash find booted kernel?
On 2 November 2015 at 09:09, Nan Xiao <xiaonan830818(a)gmail.com> wrote:
Hi all,
I am trying to use crash on RHEL 7.0.After executing "crash" command,
it outputs:
crash: cannot find booted kernel -- please enter namelist argument
After referring to crash white paper
(https://people.redhat.com/anderson/crash_whitepaper/),
I know it needs vmlinux file. So I install "kernel-debuginfo" package:
[root@localhost boot]# rpm -ql kernel-debuginfo | grep vmlinux
/usr/lib/debug/lib/modules/3.10.0-123.el7.x86_64/vmlinux
Then execute crash, it still prompts the same error:
crash: cannot find booted kernel -- please enter namelist argument
I try to copy vmlinux file into /boot directory, but this error still
exists.
How can I fix this issue? Thanks very much in advance!
Best Regards
Nan Xiao
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Hi Nan,
You need to make sure that the version of kernel-debuginfo package must
match with the version of running kernel.
Eg:
# rpm -q kernel
kernel-3.10.0-229.el7.x86_64
# uname -r
3.10.0-229.el7.x86_64
# rpm -q kernel-debuginfo
package kernel-debuginfo is not installed
# rpm -ivh kernel-debuginfo-common-x86_64-3.10.0-229.el7.x86_64.rpm
Preparing... #################################
[100%]
Updating / installing...
1:kernel-debuginfo-common-x86_64-3.#################################
[100%]
# rpm -ivh kernel-debuginfo-3.10.0-229.el7.x86_64.rpm
Preparing... #################################
[100%]
Updating / installing...
1:kernel-debuginfo-3.10.0-229.el7 #################################
[100%]
# rpm -q kernel-debuginfo
kernel-debuginfo-3.10.0-229.el7.x86_64
# crash -s
crash> sys
KERNEL: /usr/lib/debug/lib/modules/3.10.0-229.el7.x86_64/vmlinux
DUMPFILE: /dev/crash
CPUS: 2
DATE: Mon Nov 2 12:41:58 2015
UPTIME: 00:13:18
LOAD AVERAGE: 0.37, 0.37, 0.18
TASKS: 122
NODENAME: localhost.localdomain
RELEASE: 3.10.0-229.el7.x86_64
VERSION: #1 SMP Thu Jan 29 18:37:38 EST 2015
MACHINE: x86_64 (2790 Mhz)
MEMORY: 2 GB
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