Thanks for the very nice repro! I've created a fix which will be
going into the maint branch of the e2fsprogs tree. The commit
description:
resize2fs: update checksums in the extent tree's relocated block
When shrinking an file system, and we need to relocate an inode, the
checksums in its extent tree must get updated to reflect its new inode
number. When doing this, we need to do this *after* we update the
extent tree to reflect any blocks which need to be relocated due to
the file system shrink operation.
Otherwise, in the case where only an interior node of the extent tree
needs to get relocated, and none of the entries in that node need to
be adjusted, the checksum for that interior node is updated in the old
copy of that block, and then after the extent tree is updated to use
the new copy of that interior node, the extent tree is left with an
invalid checksum.
This is a relatively rare case, since it requires the following
conditions to be true:
*) The metadata checksum feature must be enabled.
*) An inode needs to be relocated.
*) The inode needs to have an interior node.
*) The block for that interior node needs to be relocated.
*) None of blocks addressed by entries in that interior node needs
to be relocated.
When all of these conditions are true, though, the file system is left
with corrupted with bad checksum for the extent tree block.
Addresses-Launchpad-Bug: 1798562
Signed-off-by: Theodore Ts'o <ty...@mit.edu>
Reported-by: Jean-Baptiste Lallement <jean-baptiste.lallem...@ubuntu.com>
I've tested e2fsprogs with this change and it fixes your repro. I also
have a regression test in the subsequent commit which reproduces the
problem with a smaller test file system.
** Patch added: "resize2fs: update checksums in the extent tree's relocated
block"
https://bugs.launchpad.net/ubuntu/+source/e2fsprogs/+bug/1798562/+attachment/5203340/+files/0001-resize2fs-update-checksums-in-the-extent-tree-s-relo.patch
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https://bugs.launchpad.net/bugs/1798562
Title:
After a side by side installation, resized filesystem is corrupted
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