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Questions tagged [kdump]

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2answers
32 views

kdump in CentOS 7

I wanted to migrate to CentOS 7.5 from CentOS 6.9. during installation I saw an option kdump that i could enable or disable. I wonder what is kdump and disabling it has any bad effect on server? I ...
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1answer
24 views

kernel.core_pattern has no effect on vmcore file name

On my RHEL7.4 VM, in /etc/kdump.conf I have set the path /var/myorg/myhost. In /etc/sysctl.conf kernel.core_pattern = core.%e.%p.%h.%t. The generated vmcore name is not as mentioned in core_pattern ...
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1answer
104 views

kdump: kexec_file_load failed: Cannot assign requested address

Issue: SERVER:~ # systemctl start kdump.service Job for kdump.service failed because the control process exited with error code. See "systemctl status kdump.service" and "journalctl -xe" for details....
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0answers
78 views

Linux kdump does not boot second kernel when kernel is crashing?

I am running Linux Mint 19 on my notebook. I have a problem with btrfs which crashed the system (no further IO possible). I would like to make kdump work to help debugging this problem. I already ...
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0answers
25 views

What does mount_root_run_init option in kdump.conf actually mean?

I do not understand the purpose of the mount_root_run_init action in kdump.conf: # default <reboot | halt | poweroff | shell | mount_root_run_init> # - Action to preform ...
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1answer
604 views

echo c > /proc/sysrq-trigger doesn't reboot the system

I am trying to collect a core dump in result of kernel panic. Installed and configured kdump, but when executing echo c > /proc/sysrq-trigger, everything just hangs and the reboot doesn't happen. I ...
1
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0answers
158 views

Crashkernel not starting after crash

I am trying to start a crash kernel using Linux's Kernel Crash Dump. Both of the host and crash kernel are compiled linux-4.13.16 kernel. Unfortunately, the crash kernel fails to start after the crash ...
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0answers
248 views

Cannot get kernel crash dump saved and reboot

I need to get a crash dump of my linux kernel. I am going to describe the scenario: Hardware: Notebook Dell E5450. Linux Distribution: Linux Mint 18.3 (Ubuntu 16.04). SysRq: enabled by /etc/sysctl.d/...
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1answer
45 views

Could the capture kernel be used as a normal kernel after a kexec?

I have read about the kexec/kdump facilities, we know that crashed/panic'ed kernel is made available via /proc/vmcore. I have heard people use kexec based booting to bypass EFI/BIOS/FW initialization ...
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1answer
243 views

I have a kdump kernel core dump; how can I analyze it?

After installing kdump-related packages and yet another hang, I now have a: /var/crash/kexec_cmd file. But what can I do with it? Should I use the command-line crash utility? I tried to, but it ...