Question about Address Range Validation in Crash Kernel Allocation

[Baoquan He]

On 03/20/24 at 01:12pm, chenhaixiang (A) wrote:
> I tested the kernel-6.8 on my machine and found that the crashkernel memory reservation range is consistent with kernel-5.10. However, it's strange that when crashkernel=512M, the kernel still allocates two memory segments for crashkernel, as seen in the logs:
> [    0.022640] crashkernel low memory reserved: 0x49000000 - 0x59000000 (256 MB)
> [    0.022641] crashkernel reserved: 0x000000c01f000000 - 0x000000c03f000000 (512 MB)
> But only one segment is shown in /proc/iomem:
> 	c01f000000-c03effffff : Crash kernel
> Moreover, the conflicting address 53cbd000-53ccffff is still reserved by someone else:
> 	53cbd000-53ccffff : Reserved
> [    0.029843] e820: update [mem 0x53cbd000-0x53ccffff] usable ==> reserved
> It seems there is a kernel bug here.
> If you need the complete log, I can send it later.

Yeah, please attach the complete log. I will have a look.