Questions tagged [kdump]
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19 questions
0
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1
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kdump.conf - file contents remove after trigger crash
I have changed the path in kdump.conf from /var/crash to /home/crash/kdump. System is AlmaLinux 8.
After triggering a crash with echo c > /proc/sysrq-trigger, the crash dump in still placed in the /...
- 561
0
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1
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567
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vmcore-dmesg : Missing the log_buf symbol
I have generated a vmcore file using kdump and are now supposed to analyze it.
First would be getting the dmesg logs from the core dump. This should be done with:
vmcore-dmesg vmcore
This however ...
- 1
1
vote
1
answer
2k
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Unable to Get Kernel Crash Dump on Kernel Panic
I'm using kexec-tools to get a crash dump of kernel on kernel panic. However, when I trigger the panic using sysrq-trigger, the system freezes. I have to power off and then power on to restore the ...
- 165
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0
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kdump.service failed to start on CentOS 8
Issue
kdump.service fails to start on CentOS 8 virtual machine on Google Cloud. Restarting the service keeps reproducing the same error.
It seems the secure boot is causing the issue or is at least ...
- 21
1
vote
1
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420
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Is UN state and D state in Linux processes are same?
I want to understand is the UN and D process state is the same? During the analysis of vmcore (crash dump) I have found lots of UN state processes.
And when I googled it I hardly found any document ...
- 11
4
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1
answer
3k
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How to reset the video mode of the Intel driver i915 for the kexec-ed kernel so I can see what kexec kernel is doing?
I'm running Arch Linux and I've set up kdump so that when the current kernel panics(or I manually induce a crash via sysrq+c) then another kernel(the kexec kernel) starts up in order to create a crash ...
user353741
1
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0
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413
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Why is crash command exiting without prompt?
I've installed a debug kernel and enabled kdump. The coredump was generated successfully, but when I try to load the vmcore after reboot, crash command just quit without prompt:
# crash /usr/lib/...
- 55.9k
1
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0
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601
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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 &...
- 389
1
vote
0
answers
269
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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 ...
- 11
4
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0
answers
2k
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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:
...
- 41
0
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1
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338
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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 ...
- 7
2
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3
answers
2k
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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 ...
- 796
0
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1
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382
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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 ...
- 143
0
votes
1
answer
2k
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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....
- 95
1
vote
1
answer
11k
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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 ...
- 111