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

[Roland Arendes]

I can confirm this bug with current karmic kernel:
 2.6.31-17-generic #54-Ubuntu SMP Thu Dec 10 17:01:44 UTC 2009 x86_64 GNU/Linux

Steps to reproduce:

Download same file with 2 sources in parallel. I took Opera, and wget.

wget http://ubuntu.intergenia.de/releases/karmic/ubuntu-9.10-desktop-i386.iso
Opera saved to http://ubuntu.intergenia.de/releases/karmic/ubuntu-9.10-desktop-i386.iso-opera

Results:

roland at pdbxe100:~$ md5sum ubuntu-9.10-desktop-i386.iso
8790491bfa9d00f283ed9dd2d77b3906  ubuntu-9.10-desktop-i386.iso
roland at pdbxe100:~$ md5sum ubuntu-9.10-desktop-i386.iso-opera 
3f979c279665cc7d6ead2c11b1060188  ubuntu-9.10-desktop-i386.iso-opera
roland at pdbxe100:~$ ls -l ubuntu-9.10-desktop-i386.iso*
-rw-r--r-- 1 roland roland 723488768 2009-10-28 22:14 ubuntu-9.10-desktop-i386.iso
-rw-r--r-- 1 roland roland 723488768 2010-01-28 15:35 ubuntu-9.10-desktop-i386.iso-opera
roland at pdbxe100:~$ 

Using cmp I found that there were NO differences?!
roland at pdbxe100:~$ cmp ubuntu-9.10-desktop-i386.iso ubuntu-9.10-desktop-i386.iso-opera

I wondered, and compared again via md5sum:
roland at pdbxe100:~$ md5sum ubuntu-9.10-desktop-i386.iso
8790491bfa9d00f283ed9dd2d77b3906  ubuntu-9.10-desktop-i386.iso
roland at pdbxe100:~$ md5sum ubuntu-9.10-desktop-i386.iso-opera 
8790491bfa9d00f283ed9dd2d77b3906  ubuntu-9.10-desktop-i386.iso-opera
roland at pdbxe100:~$ 

So after accessing the files a second time, they seemed to have synced,
flushed after delay .. or whatever.

This are my ext4 flags:
has_journal ext_attr resize_inode dir_index filetype needs_recovery extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize

I created the filesystem manually via mkfs.ext4 /dev/sda4.

-- 
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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