[Crash-utility] crash: page excluded: kernel virtual address: ffffffff81e3da50 type: "page_offset_base"

[Dave Anderson]

----- Original Message -----
> Hi Dave,
> 
> Information update: I think I found the root cause.
> 
> During the test in last week, I always use makedumpfile, use
> /etc/kdump.conf as-is:
> 
>     core_collector makedumpfile -l --message-level 1 -d 31
> 
> And now I am suggested to dump without makedumpfile by using:
> 
>     core_collector cp
> 
> I get big vmcore file of 3.5G, but crash 7.2.0++ can deal with it
> without any error, whether with or without "nokaslr" kernel parameter.
> 
> So it seems makedumpfile has problem, and if it does is, I am curious
> about that there is no other people report this kind of issue, because
> it seems easy to reproduce.
> 
> --
> Sincerely,
> Cao jin


Issues with makedumpfile are typically discussed on the upstream kexec mailing list:

  http://lists.infradead.org/mailman/listinfo/kexec

The makedumpfile command has a "LATEST_VERSION" that it supports in its makedumpfile.h
file.  In Fedora package kexec-tools-2.0.16-1.fc28, it is this:

  #define LATEST_VERSION          KERNEL_VERSION(4, 11, 7)/* linux-4.11.7 */

So it is not surprising that running it on a 4.14 kernel does not work as hoped.

Dave