e2fsck not fixing all corruptions on the first run?

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Hi,

after a few unclean shutdown, I noticed that my ext4 filesystem got mounted with:

  EXT4-fs warning: mounting fs with errors, running e2fsck is recommended

So I decided to unmount and check it with a fairly current version of e2fsck, git show tells me:

 # git show
 commit d6a525282f4b3ece90c271d470b27ef7b6853817
 Merge: 0ea8aa6... e91c9d4...
 Author: Theodore Ts'o <tytso@xxxxxxx>
 Date:   Fri Feb 29 09:21:29 2008 -0500

e2fsck indeed does find a few corruptions, fixes them. The next run, e2fsck says "clean" of course. But when I ran with -f, e2fsck did find more (small) corruptions, see the full log here:

http://nerdbynature.de/bits/e2fsprogs.pu/md4.log
http://nerdbynature.de/bits/e2fsprogs.pu/

Q: How comes e2fsck would skip a few things during the first run? If it
   (technically) has to, couldn't it NOT mark the fs clean so that one
   knows it has to run fsck again?

Thanks,
Christian.
--
BOFH excuse #274:

It was OK before you touched it.
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