Crash during vmcore_init

[Américo Wang]

On Thu, Nov 17, 2011 at 12:52 AM, Tim Hartrick <tim at edgecast.com> wrote:
>
> Americo,
>
> Attached are dmesg and iomem for 2.6.32-21-server and 2.6.38-8-server on
> the same Dell R710.  For 2.6.32-21-server the allocation of a 512M
> crashkernel area succeeded.  For 2.6.38-8-server the allocation of a
> 512M crashkernel area failed.
>

Thanks for digging this.

.32,

00000000-00000fff : System RAM
00001000-00005fff : reserved
00006000-0009ffff : System RAM
00100000-7f678fff : System RAM
  01000000-0155ec0f : Kernel code
  0155ec10-0186118f : Kernel data
  01936000-01a46ea3 : Kernel bss
  02000000-21ffffff : Crash kernel
7f679000-7f68efff : reserved

.38,

00000000-0000ffff : reserved
00010000-0009ffff : System RAM
000a0000-000bffff : PCI Bus 0000:00
00100000-7f678fff : System RAM
  01000000-015e1d6c : Kernel code
  015e1d6d-01aca17f : Kernel data
  01bae000-01d03fff : Kernel bss
7f679000-7f68efff : reserved

although the end of kernel bss grows, but there should be still
enough memory for crash kernel, at least 02000000-21ffffff should
be available, don't know why kernel fails to find it... IIRC, the bootmem
allocator was written between .32 and .38.

Anyway, could you add "bootmem_debug" to your .38 kernel to see
why kernel fails to reserve it?

Thanks.