Dave Anderson wrote:
> Try using at least -d4 and redirect the output to a file. It's much
> more verbose than the above, but it shows every readmem() made from
> the dumpfile:
>
> # crash -d4 vmlinux vmcore.cp > /tmp/debug.cp
> q
> # crash -d4 vmlinux vmcore.makedumpfile > /tmp/debug.makedumpfile
> q
> #
>
> Then compare the two outputs -- they should be pretty much identical
> (except for any crash utility user addresses) until the vmcore.makedumpfile
> fails. So you should see a successful readmem() of e0000060031417a8 in
> the "vmcore.cp" debug output at the point where it fails doing the
> read in "vmcore.makedumpfile" above.
>
> What's kind of strange is that pglist_data.node_zones structure that
> it's reading from is in the same page as the base pglist_data
> at e000006003140000, i.e., at page offset 17a8 (6056). And the code
> looks like it has already read data from that same page prior to
> reading the "zone spanned pages". (I'm presuming that the ia64 page
> size you're using is greater than 4k). But the -d4 output will
> confirm that.
Looks like it.
In the case of 'cp':
...
<readmem: a0000001010be338, KVADDR, "pgdat_list", 8, (ROE),
600fffffff8abfc0>
<readmem: e00000600315fb70, KVADDR, "pglist node_id", 4, (FOE),
600fffffff8ac01c>
<readmem: e00000600315fb48, KVADDR,
"node_mem_map", 8, (FOE), 600fffffff8ac020>
<readmem: e00000600315fb58, KVADDR, "pglist node_start_pfn", 8, (FOE),
600fffffff8ac030>
<readmem: e00000600315fb68, KVADDR, "pglist node_spanned_pages", 8,
(FOE), 600fffffff8ac040>
<readmem: e00000600315fb60, KVADDR, "pglist node_present_pages", 8,
(FOE), 600fffffff8ac048>
<readmem: e00000600315fb50, KVADDR, "pglist bdata", 8, (FOE),
600fffffff8ac090> node_table[0]:
id: 0
pgdat: e000006003140000
size: 62720
present: 62720
mem_map: a07ffff8fdd0a800
start_paddr: 6003000000
start_mapnr: 6292224
<readmem: e0000060031417a8, KVADDR, "zone spanned_pages", 8, (FOE),
600fffffff8ac058>
<readmem: e0000060031416c8, KVADDR, "zone[_struct]
free_pages", 8, (FOE), 600fffffff8ac050>
...
In the case of makedumpfile:
...
<readmem: a0000001010be338, KVADDR, "pgdat_list", 8, (ROE),
600ffffffff4bfb0>
<readmem: e00000600315fb70, KVADDR, "pglist node_id", 4, (FOE),
600ffffffff4c00c>
<readmem: e00000600315fb48, KVADDR, "node_mem_map", 8, (FOE),
600ffffffff4c010>
<readmem: e00000600315fb58, KVADDR, "pglist node_start_pfn", 8, (FOE),
600ffffffff4c020>
<readmem: e00000600315fb68, KVADDR, "pglist node_spanned_pages", 8,
(FOE), 600ffffffff4c030>
<readmem: e00000600315fb60, KVADDR, "pglist node_present_pages", 8,
(FOE), 600ffffffff4c038>
<readmem: e00000600315fb50, KVADDR, "pglist bdata", 8, (FOE),
600ffffffff4c080> node_table[0]:
id: 0
pgdat: e000006003140000
size: 62720
present: 62720
mem_map: a07ffff8fdd0a800
start_paddr: 6003000000
start_mapnr: 6292224
<readmem: e0000060031417a8, KVADDR, "zone spanned_pages", 8, (FOE),
600ffffffff4c048>
crash: page excluded: kernel virtual address: e0000060031417a8 type:
"zone spanned_pages"
jay
>
> Dave
>
>
