Because I just had to force-update the local reference:
.../git.git$ git --bare log -g origin/master
commit 2ebc02d32a4360da2cf69c2b5f5bfad0716d42b0
Reflog: refs/remotes/origin/master@{1} (Alex Riesen <raa.lkml@gmail.com>)
Reflog message: fetch git: fast forward
Author: Junio C Hamano <gitster@pobox.com>
Date: Sun Aug 17 15:48:51 2008 -0700Start 1.6.1 cycle
Signed-off-by: Junio C Hamano <gitster@pobox.com>
commit ea02eef096d4bfcbb83e76cfab0fcb42dbcad35e
Reflog: refs/remotes/origin/master@{2} (Alex Riesen <raa.lkml@gmail.com>)
Reflog message: fetch origin: fast forward
Author: Junio C Hamano <gitster@pobox.com>
Date: Sun Aug 17 11:42:10 2008 -0700GIT 1.6.0
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The commit ea02eef096d4bfcbb83e76cfab0fcb42dbcad35e is the current value of master (on kernel.org). But it definitely was 2ebc02d32a4360da2cf69c2b5f5bfad0716d42b0 some time before (at 11:42)!