KDUMP - kernel debug analysis consult

[David Pilnik IL]

Hi,

I Have some issue related KDUMP more specifily related to the analisis of KDUMP.
I manage to enabled KDUMP and see the DUMP file when system is crash.
But I have issue when trying to analisis the DUMP file. Its someone fammiliar with this topic?

details:
1. I copy the vmlinux file with DEBUG symbols from my local sonic-buildimage build. 
2. install crash utility,

3. run : crash vmlinuz DUMP_file

and I got this error:
<readmem: ffffffffaf6017d8, KVADDR, "mem_section", 8, (FOE), 7ffcfba0e370>
<read_diskdump: addr: ffffffffaf6017d8 paddr: 1924017d8 cnt: 8>
read_diskdump: paddr/pfn: 1924017d8/192401 -> cache physical page: 192401000
<readmem: 0, KVADDR, "memory section root table", 32768, (FOE), 5639cec73b60>
<read_diskdump: addr: 0 paddr: 0 cnt: 4096>
read_diskdump: SEEK_ERROR: paddr/pfn: 0/0 !page_is_ram
crash: seek error: kernel virtual address: 0  type: "memory section root table"