STGIT: Deathpatch in linus tree

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Hi -

Linus just pushed 105e5180936d69b1aee46ead8a5fc6c68f4d5f65 to
linux-2.6... along the lines of the Monty Python joke that was so funny
it kills anyone who hears it, if I have a stgit branch based on a HEAD
that includes this commit then stgit dies when pushing on top of it.

So...

[agreen@build linux-2.6]$ stg pop --all
[agreen@build linux-2.6]$ git reset --hard 96e02d1
HEAD is now at 96e02d1 exec: fix use-after-free bug in setup_new_exec()
[agreen@build linux-2.6]$ stg push
Pushing patch "subject-patch-1-3-arm-dt-add-p" ... done (empty)
Now at patch "subject-patch-1-3-arm-dt-add-p"
[agreen@build linux-2.6]$ stg pop
Popped subject-patch-1-3-arm-dt-add-p
No patch applied

So the commit just before the bad guy is happy.  Then -->

[agreen@build linux-2.6]$ git reset --hard 105e518
HEAD is now at 105e518 Merge tag 'hwmon-fixes-for-3.3-rc3' of
git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging
[agreen@build linux-2.6]$ stg push
Error: Unhandled exception:
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/stgit/main.py", line 152, in _main
    ret = command.func(parser, options, args)
  File "/usr/lib/python2.7/site-packages/stgit/commands/push.py", line
68, in func
    check_clean_iw = clean_iw)
  File "/usr/lib/python2.7/site-packages/stgit/lib/transaction.py", line
95, in __init__
    self.__current_tree = self.__stack.head.data.tree
  File "/usr/lib/python2.7/site-packages/stgit/lib/git.py", line 426, in
data
    self.__repository.cat_object(self.sha1))
  File "/usr/lib/python2.7/site-packages/stgit/lib/git.py", line 408, in
parse
    assert False
AssertionError

It also dies if I use Linus' current HEAD as the basis I am stgitting on
top of, which is one patch ahead of the deathpatch.

I'm using Fedora rawhide versions of git and stgit

git-1.7.9-1.fc17.x86_64
stgit-0.15-2.fc17.noarch

-Andy
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