makedumpfile fail to strip pages

Martin Friedrich martin.friedrich at hetzner-cloud.de
Fri Sep 20 00:33:29 PDT 2024


Added missing attachments for amd64 and arm64 kernels.

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> On 20. Sep 2024, at 09:31, Martin Friedrich <martin.friedrich at hetzner-cloud.de> wrote:
> 
> Hello,
> 
> I try to identify the root-cause of an issue with kdump & makedumpfile which results in dumps to have a size of the system memory.
> Kdump-tools/makedumpfile has been configured to strip most pages with the flags: " -c -d 31" and transfer the dump to an ssh target.
> 
> I'm unable to replicate the issue by crashing kernel using sysrq-triggers. As long the system crashed by sysrq-trigger, the dump has the correct size and completes successfully. 
> But as soon a system crashes for other reasons, dumps get huge and fail to transfer to the ssh target due to their size.
> 
> Our servers (x64/aarch64) are running Ubuntu 22.04 with a self built kernel 6.6.32 (config attached) and makedumpfile (backported 1.7.5-3 to Ubuntu 22.04).
> 
> Am I missing something within the kernel config which could cause this behavior?
> 
> 
> Thanks
> -- Martin



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