Saïvann,
Thank you very much for doing the bisect and confirming Carey's results.
The problem with this is that the commit that you figured as causing the
problem, dbf8b1c4, is identical to commit 82eb4869, which appeared in
2.6.28.7, and commit 920313a7, which appeared in 2.6.29-rc1, and so was
in 2.6.29. And users of stock 2.6.28.8 and 2.6.29 kernels have
reported that the issue reported in this bug have gone away.
So as I had said earlier, this looks like it's a combination of multiple
patches that are necessary to cause this problem, and it's not just
commit dbf8b1c4. OK, so what I've done is the following. I ran the
command "git log --reverse --pretty=oneline --abbrev-commit --abbrev=8
v2.6.28.. fs/ext4 fs/jbd2" on the Jaunty kernel git tree, and extracted
the list of commits that touched the fs/ext4 and fs/jbd2 kernel. There
are only 10 of these patches between 2.6.28 and commit dbf8b1c4
(including dbf8b1c4). I then did a "for i in `cat /tmp/clist`; do git
cherry-pick $i; done" to create a kernel tree which *only* has the
Ubuntu sauce patches that touched the fs/ext4 and fs/jbd2 trees.
I've exported this as branch "ubuntu-330824-test" on my ext4.git tree.
Unfortunately, it looks like master.kernel.org is being slow to mirror
out changes to git.kernel.org, so if you're not seeing at:
http://git.kernel.org/?p=linux/kernel/git/tytso/ext4.git
git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git
I've also pushed the branch ubuntu-330824-test to:
http://github.com/tytso/ext4/tree/ubuntu-330824-test
git://github.com/tytso/ext4.git
Saïvann, can you give this tree a try? If it works, then the problem
must be an interaction with one of the *other* Sauce patches between
v2.6.28 and dbf8b1c4, and that may be a very large haystack. If you
get a failure (i.e., you can reproduce the bug), then the problem must
be in one of the ten commits on ubuntu-330824-test. Obviously, a
failure is preferable since it will be easier haystack with 10 commits
than it will be to find the problem in a haystack with 700 commits.
:-)
Either way, though, it should give us more information.
Thanks for the work you've done so far,
--
Soft lockups (freezes) when deleting files from ext4 partitions on 2.6.28
https://bugs.launchpad.net/bugs/330824
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