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Please see below. Always reproducible.
[root@blackout pacman]# pacman -Syy
:: Synchronizing package databases...
--2009-08-09 20:14:48-- http://mirror.rit.edu/archlinux/testing/os/i686/testing.db.tar.gz
[---snip---]
Saving to: `/var/lib/pacman/testing.db.tar.gz.part'
[---snip---]
2009-08-09 20:14:50 (34.5 KB/s) - `/var/lib/pacman/testing.db.tar.gz.part' saved [13086/13086]
--2009-08-09 20:14:50-- http://mirror.rit.edu/archlinux/core/os/i686/core.db.tar.gz
[---snip---]
Saving to: `/var/lib/pacman/core.db.tar.gz.part'
[---snip---]
2009-08-09 20:14:54 (16.0 KB/s) - `/var/lib/pacman/core.db.tar.gz.part' saved [34301/34301]
--2009-08-09 20:14:54-- http://mirror.rit.edu/archlinux/extra/os/i686/extra.db.tar.gz
[---snip---]
Saving to: `/var/lib/pacman/extra.db.tar.gz.part'
[---snip---]
2009-08-09 20:15:07 (40.9 KB/s) - `/var/lib/pacman/extra.db.tar.gz.part' saved [427819/427819]
--2009-08-09 20:15:08-- http://mirror.rit.edu/archlinux/community/os/i686/community.db.tar.gz
[---snip---]
Saving to: `/var/lib/pacman/community.db.tar.gz.part'
[---snip---]
2009-08-09 20:15:14 (123 KB/s) - `/var/lib/pacman/community.db.tar.gz.part' saved [376103/376103]
[root@blackout pacman]# pacman -Su
:: Starting full system upgrade...
warning: asciidoc: ignoring package upgrade (8.2.7-1 => 8.4.5-1)
warning: firefox: local (3.5.3pre-6) is newer than extra (3.5.2-1)
warning: libdrm: local (20090719-1) is newer than extra (2.4.12-1)
warning: smplayer: local (0.6.8-2) is newer than extra (0.6.8-1)
warning: xf86-video-intel: local (20090808-1) is newer than extra (2.7.99.902-1)
local database is up to date
[root@blackout pacman]# pacman -Syu
:: Synchronizing package databases...
--2009-08-09 20:15:32-- http://mirror.rit.edu/archlinux/testing/os/i686/testing.db.tar.gz
[---snip---]
Saving to: `/var/lib/pacman/testing.db.tar.gz.part'
[---snip---]
2009-08-09 20:15:41 (4.99 KB/s) - `/var/lib/pacman/testing.db.tar.gz.part' saved [13086/13086]
--2009-08-09 20:15:41-- http://mirror.rit.edu/archlinux/core/os/i686/core.db.tar.gz
[---snip---]
Saving to: `/var/lib/pacman/core.db.tar.gz.part'
[---snip---]
2009-08-09 20:15:48 (10.6 KB/s) - `/var/lib/pacman/core.db.tar.gz.part' saved [34301/34301]
--2009-08-09 20:15:48-- http://mirror.rit.edu/archlinux/extra/os/i686/extra.db.tar.gz
[---snip---]
Saving to: `/var/lib/pacman/extra.db.tar.gz.part'
[---snip---]
2009-08-09 20:16:08 (24.5 KB/s) - `/var/lib/pacman/extra.db.tar.gz.part' saved [427819/427819]
error: could not remove database extra
error: failed to update extra (could not remove database entry)
--2009-08-09 20:16:09-- http://mirror.rit.edu/archlinux/community/os/i686/community.db.tar.gz
[---snip---]
Saving to: `/var/lib/pacman/community.db.tar.gz.part'
[---snip---]
2009-08-09 20:16:20 (45.2 KB/s) - `/var/lib/pacman/community.db.tar.gz.part' saved [376103/376103]
error: could not remove database community
error: failed to update community (could not remove database entry)
:: Starting full system upgrade...
local database is up to dateOffline