makedumpfile fail to strip pages

[HAGIO KAZUHITO(萩尾 一仁)]

On 2024/09/20 16:31, Martin Friedrich 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?

hmm, I have not seen such a behavior.

- what happens with the latest (bd30437c6292) makedumpfile?
- is it possible to get makedumpfile logs with "--message-level 31" on 
sysrq crash and other reasons? (to compare the logs including stats)

Thanks,
Kazu