git rebase: unexpected conflict

git rebase seems to see conflicts where there shouldn't be any.

Example: I have a tree here:

git://git/openfabrics.org/~vlad/ofed_1_2/.git

and have efedfe57a21a134a65d951bcca73af46da609c5e checked out (I think it moved since, but you can create a branch if you like).

This is tree from Linus + some extra drivers added
(it's large (as kernel trees often are), so use
 Linus' tree as a reference if you want to clone it).

Now, I decided I don't like 9b3bfe5696aa417d38ce903eb345a03d65743dd2, and since no one is likely to have a clone of this tree, it should be OK to remove it from history with git rebase.

So I did:

git-rebase --onto 9b3bfe5696aa417d38ce903eb345a03d65743dd2~1 \
		9b3bfe5696aa417d38ce903eb345a03d65743dd2

and it starts replaying the changes I pulled from Linus' tree:

-------------------------- First, rewinding head to replay your work on top of it... HEAD is now at 6cc583d... IB/sdp: allow users via module parameter to bound SDP's memory use

Applying '[JFFS2] kill warning RE debug-only variables'

Wrote tree 3a03db80ed42fda246e5e8420699e22cdd6fff89
Committed: c0427b1c39aeb86ea7b97a25ed7b623ac563b516

Applying '[MTD NAND] Initial import of CAFÉ NAND driver.'

Adds trailing whitespace.
.dotest/patch:44:/*
Adds trailing whitespace.
.dotest/patch:93:
Adds trailing whitespace.
.dotest/patch:225:              /* Ignore the first command of a pair; the hardware
Adds trailing whitespace.
.dotest/patch:242:      dev_dbg(&cafe->pdev->dev, "dlen %x, ctl1 %x, ctl2 %x\n",
Adds trailing whitespace.
.dotest/patch:507:
warning: squelched 2 whitespace errors
warning: 7 lines add trailing whitespaces.
Wrote tree 18cdff711481cdb4c495a846a7776203198dfc87
Committed: 4cfaf4dd2573cd695603f31c404f3b66e1515487

Applying '[MTD] SSFDC must depend on BLOCK'

Wrote tree c91cb50928089c0968d40a14432085db58b12614
Committed: 60a9aa8868bab0821b8cdb05f711e7a812584800

Applying '[MTD NAND] OLPC CAFÉ driver update'

Adds trailing whitespace.
.dotest/patch:119:      cafe_dev_dbg(&cafe->pdev->dev, "dlen %x, ctl1 %x, ctl2 %x\n",
Adds trailing whitespace.
.dotest/patch:198:/* Ick. The BBT code really ought to be able to work this bit out
warning: 2 lines add trailing whitespaces.
Wrote tree 3c7c72650eea2c613569ca51bc47775beca984c9
Committed: fc6406731b3fe302d630317593483fbde9abe8d4

Applying '[MTD] MAPS: Add parameter to amd76xrom to override rom window size'

Wrote tree ae4567223d6b8ed5408ca0b63611b0f7962589aa
Committed: c4f773a7476520b5459ddbb83df5fe143eec4626

Applying '[MTD] CHIPS: Support for SST 49LF040B flash chip'

Wrote tree c5038d0ec22dbc4ba571c9a82697a43f8dd2bd9b
Committed: f19c8f26bc9849531b28d48430c09e0359976a3e

Applying '[MTD] MAPS: Support for BIOS flash chips on Intel ESB2 southbridge'

Wrote tree 169159ae4017bc3838a01ad737fae53efa150a09
Committed: c6ec7ab7ef424713c6bf62fa436b95912c18db3a

Applying '[JFFS2] Use rb_first() and rb_last() cleanup'

Wrote tree 53862b25b4bbd4c7e57cc893025545ce235eb1b8
Committed: 0f45697d933b9db1edae3cac0a59284cdae5656f

Applying '[MTD] JEDEC probe: fix comment typo (devic)'

Wrote tree 82173259dd1c133e7f9c5879fd096ba658f69cb4
Committed: 2119a3d1d4af4bfbcb72494b994ce52d0d6ad08b

Applying '[MTD] MAPS: esb2rom: use hotplug safe interfaces'

Wrote tree cab550abb9f4d577243bb6492706922c58cd9a44
Committed: 4d7f42ad97194199da7ad4ec0ae80ce5399b7554

Applying '[JFFS2] Fix jffs2_follow_link() typo'

Wrote tree fe9d6afb990115817aae90716640e5588c79c7c6
Committed: 29cd2f5afa2aa8a8ea7842437f6cdd534605a70e

Applying '[MTD] NAND: AT91 NAND driver'

error: patch failed: drivers/mtd/nand/Kconfig:232
error: drivers/mtd/nand/Kconfig: patch does not apply
Using index info to reconstruct a base tree...
Falling back to patching base and 3-way merge...
 100% (22053/22053) done
Auto-merged drivers/mtd/nand/Kconfig
CONFLICT (content): Merge conflict in drivers/mtd/nand/Kconfig
Auto-merged drivers/mtd/nand/Makefile
Failed to merge in the changes.
Patch failed at 0012.

When you have resolved this problem run "git rebase --continue". If you would prefer to skip this patch, instead run "git rebase --skip". To restore the original branch and stop rebasing run "git rebase --abort". --------------------------

Sure enough, there are conflicts in drivers/mtd/nand/Kconfig:

<<<<<<< HEAD:drivers/mtd/nand/Kconfig
config MTD_NAND_CAFE
       tristate "NAND support for OLPC CAFÉ chip"
       depends on PCI
       help
         Use NAND flash attached to the CAFÉ chip designed for the $100
         laptop.
=======
config MTD_NAND_AT91
        bool "Support for NAND Flash / SmartMedia on AT91"
        depends on MTD_NAND && ARCH_AT91
        help
          Enables support for NAND Flash / Smart Media Card interface
          on Atmel AT91 processors.

But I don't really understand where do the conflicts come from: The patch I skipped (9b3bfe5696aa417d38ce903eb345a03d65743dd2) only touched the file drivers/infiniband/core/addr.c, so why can't rebase replay all of the changes?