On Fri, Mar 31, 2006 at 11:23:32PM +0900, Ken'ichi Ohmichi wrote:
>
> I tested kdump in 2.6.16-mm2, and the file size of vmcore is now displayed
> correctly. But the cp command(copy vmcore to the disk) fails.
>
> The physical address of the problem offset(4,226,876,448) is not found at
> map_offset_to_paddr(). Because m->offset more than this offset is not set.
> The content of vc_list was as follows at map_offset_to_paddr().
>
> Debug:
> static u64 map_offset_to_paddr(loff_t offset, struct list_head *vc_list,
> struct vmcore **m_ptr)
> {
> struct vmcore *m;
> u64 paddr;
>
> list_for_each_entry(m, vc_list, list) {
> u64 start, end;
> start = m->offset;
> end = m->offset + m->size - 1;
> if (offset >= start && offset <= end) {
> paddr = m->paddr + offset - start;
> *m_ptr = m;
> return paddr;
> }
> }
> + list_for_each_entry(m, vc_list, list) {
> + start = m->offset;
> + end = m->offset + m->size - 1;
> + printk(KERN_ERR "start = %llx, end = %llx\n", start, end);
> + }
> *m_ptr = NULL;
> return 0;
> }
>
> Output:
> start = 190, end = 233
> start = 234, end = 2d7
> start = 2d8, end = 37b
> start = 37c, end = 41f
> start = 420, end = a041f
> start = a0420, end = fa041f
> start = fa0420, end = 33fa041f
> start = 33fa0420, end = cbf1041f
> start = cbf10420, end = fbf1041f(4,226,876,447)
>
> Do you have any idea why this is happening?
Ok. I guess that you have got a congituous chunk of memory which is more
than 4G and size field overflow might be taking place in /proc/vmcore code.
Can you please apply the attached patch and try.
Please also post the output of /proc/iomem.
Thanks
Vivek
Signed-off-by: Vivek Goyal <[EMAIL PROTECTED]>
---
include/linux/proc_fs.h | 2 +-
1 files changed, 1 insertion(+), 1 deletion(-)
diff -puN include/linux/proc_fs.h~kdump-vmcore-size-overflow-bug-fix
include/linux/proc_fs.h
---
linux-2.6.16-mm2-16M/include/linux/proc_fs.h~kdump-vmcore-size-overflow-bug-fix
2006-03-31 16:13:47.000000000 -0500
+++ linux-2.6.16-mm2-16M-root/include/linux/proc_fs.h 2006-03-31
16:13:59.000000000 -0500
@@ -79,7 +79,7 @@ struct kcore_list {
struct vmcore {
struct list_head list;
unsigned long long paddr;
- unsigned long size;
+ unsigned long long size;
loff_t offset;
};
_
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