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SubjectRe: 2.4.0-test11 ext2 fs corruption

On Tue, 28 Nov 2000, Petr Vandrovec wrote:

> > two ranges? Then it looks like something way below the fs level... Weird.
> > Could you verify it with dd?
> Yes, it is identical copy. But I do not think that hdd can write same
> data into two places with one command...
> vana:/# dd if=/dev/hdd1 bs=4096 count=27 skip=722433 | md5sum
> 27+0 records in
> 27+0 records out
> 613de4a7ea664ce34b2a9ec8203de0f4
> vana:/# dd if=/dev/hdd1 bs=4096 count=27 skip=558899 | md5sum
> 27+0 records in
> 27+0 records out
> 613de4a7ea664ce34b2a9ec8203de0f4
> vana:/#

Bloody hell... OK, let's see. Both ranges are covered by multiple files
and are way larger than one page. I.e. anything on pagecache level is
extremely unlikely - pages are not searched by physical location on
disk. And I really doubt that it's ext2_get_block() - we would have
to get a systematic error (constant offset), then read the data in
for no good reason, then forget the page->buffers, then get the right
values fro ext2_get_block(), leave the data unmodified _and_ write it.

It almost looks like a request in queue got fscked up retaining the
->bh from one of the previous (also coalesced) requests and having
correct ->sector. Weird.

Linus, Andrea - any ideas? Situation looks so: after massive file creation
a range of disk with the data from new files (many new files) got
duplicated over another range - one with the data from older files
(also many of them). 27 blocks, block size == 4Kb. No intersection
between inodes, fsck is happy with fs, just a data ending up in two
places on disk. No warnings from IDE or ext2 drivers.

Kernel: test11 built with 2.95.2, so gcc bug may very well be there.
However, I really wonder what could trigger it in ll_rw_blk.c - 5:1
that shit had hit the fan there.

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