[Crash-utility] kmem -[sS] segfault on 2.6.25.17

[Dave Anderson]

> ----- "Mike Snitzer" <snitzer at gmail.com> wrote:
> > BTW, if need be, would you be able to make the vmlinux/vmcore pair
> > available for download somewhere?  (You can contact me off-list
> with the particulars...)
>
> I can work to make that happen if needed...

OK, I've got your vmlinux/vmcore pair, and right away I can see
what the problem is.  The BZERO/memset runs into the weeds here:  

         BZERO(si->cpudata[i], sizeof(ulong) * vt->kmem_max_limit);

Running "help -v" dumps the crash-internal VM-related table, and the
initialization-time determination of vt->kmem_max_limit is absurd
(-32512, or ffffffffffff8100):

  crash> help -v
                flags: 5c52  
  (NODES_ONLINE|ZONES|PERCPU_KMALLOC_V2|KMEM_CACHE_INIT|SPARSEMEM|SPARSEMEM_EX|PERCPU_KMALLOC_V2_NODES)
       kernel_pgd[NR_CPUS]: ffffffff80201000 ...
          high_memory: ffff81007fb50000
        vmalloc_start: ffffc20000000000
              mem_map: 0
          total_pages: 523088
            max_mapnr: 0
       totalram_pages: 479819
      totalhigh_pages: 0
        num_physpages: 523088
      page_hash_table: 0
  page_hash_table_len: 0
       kmem_max_c_num: 92
       kmem_max_limit: -32512
        kmem_max_cpus: 4
     kmem_cache_count: 184
  ...     

When you run this same kernel on the live system, what do you see 
when you enter "help -v"?

Dave