[Bug 453579] Re: in-place corruption of large files *without fsck or reboot* reported with linux 2.6.31-14.46 on ext4

[Surbhi Palande]

Also, the result of this quick test from anyone who sees this bug, would
be appreciated. If you have a ext3 fs/any other fs on some partition(or
a sufficiently large file which is formated as a fs other than ext4)
then please do the following:

A) ensure that your blocksize if 4096 bytes by looking at the output of dumpe2fs -h <partition which has ext4>
B) from the same output see if you can find "extent" in the line which has  "Filesystem features" 
C) post the output dumpe2fs -h <partition which has ext4>

if blocksize is 4096 bytes then:

1) download the iso on this ext3/other filesystem 
2) dd if=<iso name> of=/dev/<ext*4* partition>/<some file name> bs=512MB count=1 
3) the md5sum should be: faf49ac5a653e339f84a8dd0b7c047dc 

(Note that bs=512MB  writes  512000000 bytes... if you write 536870912 bytes (i.e 4096 * 131072) then the md5sum should be this:
bcbc14f5bfc9229995afaf786bbb2445)  Please report if the md5sum matches or not. Thanks for your help :)

-- 
in-place corruption of large files *without fsck or reboot* reported with linux 2.6.31-14.46 on ext4
https://bugs.launchpad.net/bugs/453579
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