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SubjectRe: 2.6.0-test2-bk3 phantom I/O errors
Sander van Malssen <> wrote:
> If I try this on 2.6.0-test2-mm1 with the dump_stack() added (ext3, no
> initrd) I get the following:
> Buffer I/O error on device hda1, logical block 25361
> Call Trace:
> [<c0150f02>] buffer_io_error+0x42/0x50

OK, looks like the new readahead stuff confused the error reporting.

Does this make the error messages go away?

diff -puN mm/readahead.c~a mm/readahead.c
--- 25/mm/readahead.c~a 2003-07-30 11:58:07.000000000 -0700
+++ 25-akpm/mm/readahead.c 2003-07-30 11:58:20.000000000 -0700
@@ -96,7 +96,7 @@ static int read_pages(struct address_spa
struct pagevec lru_pvec;
int ret = 0;

- current->flags |= PF_READAHEAD;
+// current->flags |= PF_READAHEAD;

if (mapping->a_ops->readpages) {
ret = mapping->a_ops->readpages(filp, mapping, pages, nr_pages);

Tell me how hard this is to hit. Does it only happen when there is a large
amount of IO happening? What is the system doing at the time?
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