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Questions tagged [kdump]

13 questions
12
votes
2 answers

Why is Linux kdump not writing to /var/crash?

It's happened again! I have 4 servers which are crashing periodically, and there is no information printed to the system logs or the serial console. In addition, the Linux kdump service isn't writing core dumps to the default location of…
Stefan Lasiewski
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2 answers

Centos kdump hangs up

Trying kdump on CentOS 6.3. On VMWare everything is fine and on oops crash kernel is loaded and vmcore created. On phisical machine I see oops message, but crash kernel is not started. I used kexec to load kernel, kdump loads. I used "kexec --load"…
dimba
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3
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2 answers

Cannot start kdump

My system always crashes down. So I decided to enable kdump to see the problem since I was not able to see possible errors on the log files. I followed the steps to set up kdump from a site here. My server runs on CentOS 5.8 and 16GB RAM. Below are…
Pelang
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2
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3 answers

Performance impact of running kdump

We are currently running into an issue on a RHEL 5.6 server. The server randomly becomes unstable, kernel wait messages are showing up in /var/log/messages, and we've now had it reboot twice. We've sent all of our available information to Red Hat,…
Matthew
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1
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1 answer

Getting console or dmesg contents when unable to login after OS crash

Our server Supermicro SYS-6016T-U often crashes due to https://bugs.centos.org/view.php?id=10642 . Since it's unable to write to disk, crash info isn't saved. I also cannot login using either IPMI kvm console or ssh to run dmesg. How to configure it…
basin
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1
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0 answers

How to determine what is crashing our systems (CentOS 7) from kdump?

we currently have 3 out of 3 systems running CentOS in the exact same hardware and software configuration but are experiencing random system hangs. The occurrence can happen randomly as short as 20 minutes since boot or may take up to 1 or 2 weeks…
Andy
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1
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0 answers

why kernel crashdump is not able to dump vmcore?

im using ubuntu 16.04 on esxi-6, the proc/cmdline shows crashkernel is loaded at boottime BOOT_IMAGE=/boot/vmlinuz-4.15.0-54-generic root=UUID=b12d12f2-cfd9-465d-9b10b12d12f2 ro net.ifnames=0 biosdevname=0 text crashkernel=384M-:128M there are no…
sherpaurgen
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0
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0 answers

change the core-dump location - abrtd configuration

I'm trying to change the Linux core-dump location to a different directory using the abrtd configuration (normally it is going to the location core,but according to my research, if you enable abrtd, that will overwrite the default location.) cat…
Tharanga Abeyseela
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0
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1 answer

kdump isnt working on redhat machines

How to force Linux to crash: we installed the kexec-tools (kdump) on our redhat machines ( version 7.1 ) in order to capture problems by creating core file under /var/crash folder we check that kdump is install as rpm -qa | grep kexec ( verify rpm…
dandan
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0
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2 answers

Is kdump not installed when /etc/kdump.conf is missing?

I have CentOS 5.8 system. And I want to set up the kdump. I was following this configuration steps on kdump. However I was not able to locate /etc/kdump.conf. I tried using the find and locate command to find kdump.conf, but it return no…
Pelang
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0
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0 answers

Debian 10 cannot trigger crash to test kdump

I have set up kdump to debug an issue, and now I am trying to test it, because the issue I am trying to debug does not create a file in /var/crash. However, the test also does not work. I am executing these commands as root: echo "1" >…
Tom Atix
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0
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0 answers

How to understand kernel crash with vmcore-dmesg.txt and kexec-dmesg.log

I have a server running CentOS 8, the kernel crashed someday and I found the found the following three files in /var/crash: vmcore, vmcore-dmesg.txt, and kexec-dmesg.log. I first looked at vmcore-dmesg.txt, which gives me the following info at the…
Stephano Ermon
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1 answer

kdump not saving to /var/crash on Centos 8.1 server

I am trying to test the kernel dump using echo 1 > /proc/sys/kernel/sysrq ; echo c > /proc/sysrq-trigger command. On some servers, I can get the dump and on some servers I don't see anything. The kdump config is the same across the fleet and it is…
ram
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