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Questions tagged [kdump]

The tag has no usage guidance.

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Does kdump work with encrypted volumes by default

I'm running a system with /var/crash on an encrypted volume. (specifically, it's on an encrypted /) If I'm starting kdump with Fedora's default configuration: path /var/crash core_collector ...
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Should I remove watchdog when using kdump

Is it safe to enable both the watchdog and kdump when expecting to catch a kernel crash? Specifically, I'm using hardware iTCO_wdt and software watchdog. If I get in a situation where kdump starts to ...
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Not able to save crash dump using kdump

I have a VPS server on amazon's AWS Lightsail service. I've been testing kdump using the following two commands(to trigger an automatic kernel crash): # echo 1 > /proc/sys/kernel/sysrq # echo c &...
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Kernel crashes at different points

I have made a custom board using Tegra TK1 ARM processor. I have compiled uboot and kernel for it and flashed into it. Now when it starts booting, sometimes it boots successfully while sometimes ...
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Hard lockup triggers reboot but no panic and no kdump

I have been trying to debug random system freezes when running the 4.14.93-rt kernel. To this end, I have enabled the lockup detector in the kernel using the following config: ...
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1answer
68 views

Why there are two entries for crashkernel parameter in the grub.conf file?

I'm trying to enable kdump on a server but in the grub configuration file, there are two entries for the crashkernel parameter for each OS entry. I know that this parameter is used to allocate memory ...
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2answers
125 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
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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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228 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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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
1k 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 ...
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194 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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309 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
63 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
331 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 ...