Crash deep in heap allocation for rtems_region_get_segment() call

[Gedare Bloom]

On Tue, Mar 6, 2018 at 1:12 PM, Matthew J Fletcher <amimjf at gmail.com> wrote:
> Hi
>
> So the current block is 0x70b0bef8 with a size_and_flag of 257, block->next
> is 0x70b0c9f8 with a size_and_flag of 3444481, block->prev is 0x701615b8
> with a size_and_flag of 0.
>
> I note that the 'prev' and the 'free_list_anchor' are the same, as is the
> 'heap' pointer, not sure if thats normal ?
>
I don't know the answer to this question, but I suspect it is normal
and that the current block is the first unused block, with size 256.

The block_next is unused with size 3,444,480 or about 3.2 MiB as would
be expected. As far as I can tell, there's not a good reason for the
crash at this point, so I'm baffled. The memory accesses appear to be
within the expected regions.


>
> I would normally presume this is a BSP / my_platform issue, but my linker
> script has the following, which looks fine.
>
>  "SDRAM      : ORIGIN = 0x70000000, LENGTH = 0x01000000"
>  "RTEMS_AREA : ORIGIN = ORIGIN (SDRAM), LENGTH = 9216k"  // APP_BSS and
> APP_HEAP are after this, so 9216k is somewhat arbitrary.
>
>
>
> regards
> ---
> Matthew J Fletcher
>
>
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