Public bug reported:

In a branch with 2 pipes I had the following error, after performing the
following operations:

- (in pipe1) merge some changes from upstream
- bzr pump
- bzr switch-pipe :next

at this point, "bzr status", "bzr push"  all crash with the error:


bzr: ERROR: exceptions.IndexError: list index out of range

Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 930, in 
exception_to_return_code
    return the_callable(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 1121, in 
run_bzr
    ret = run(*run_argv)
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 673, in 
run_argv_aliases
    return self.run(**all_cmd_args)
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 697, in run
    return self._operation.run_simple(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/cleanup.py", line 136, in 
run_simple
    self.cleanups, self.func, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/cleanup.py", line 166, in 
_do_with_cleanups
    result = func(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 1138, in 
ignore_pipe
    result = func(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/builtins.py", line 414, in run
    classify=not no_classify)
  File "/usr/lib/python2.7/dist-packages/bzrlib/status.py", line 175, in 
show_tree_status
    classify=classify)
  File "/usr/lib/python2.7/dist-packages/bzrlib/status.py", line 75, in 
report_changes
    want_unversioned=want_unversioned)
  File "/usr/lib/python2.7/dist-packages/bzrlib/tree.py", line 103, in 
changes_from
    want_unversioned=want_unversioned,
  File "/usr/lib/python2.7/dist-packages/bzrlib/decorators.py", line 155, in 
read_locked
    result = unbound(self, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/tree.py", line 1112, in compare
    want_unversioned=want_unversioned)
  File "/usr/lib/python2.7/dist-packages/bzrlib/delta.py", line 129, in 
_compare_trees
    want_unversioned=want_unversioned):
  File "bzrlib/_dirstate_helpers_pyx.pyx", line 1465, in 
bzrlib._dirstate_helpers_pyx.ProcessEntryC.__next__ 
(bzrlib/_dirstate_helpers_pyx.c:14682)
  File "bzrlib/_dirstate_helpers_pyx.pyx", line 1577, in 
bzrlib._dirstate_helpers_pyx.ProcessEntryC._iter_next 
(bzrlib/_dirstate_helpers_pyx.c:15704)
  File "bzrlib/_dirstate_helpers_pyx.pyx", line 1155, in 
bzrlib._dirstate_helpers_pyx.ProcessEntryC._process_entry 
(bzrlib/_dirstate_helpers_pyx.c:9726)
IndexError: list index out of range

bzr 2.8.0dev1 on python 2.7.12 (Linux-4.8.0-34-generic-x86_64-with-
    Ubuntu-16.10-yakkety)
arguments: ['/usr/bin/bzr', 'st']
plugins: bash_completion[2.8.0dev1], bisect[1.1.0dev], builddeb[2.8.6],
    bzrcommitmessage[unknown], bzrtools[2.6.0], changelog_merge[2.8.0dev1],
    diffstat[0.2.0], email[unknown], fastimport[0.14.0dev], grep[2.8.0dev1],
    launchpad[2.8.0dev1], lsreview[unknown],
    netrc_credential_store[2.8.0dev1], news_merge[2.8.0dev1], pipeline[1.5.0],
    po_merge[2.8.0dev1], tiplog[0.0.6dev], weave_fmt[2.8.0dev1]
encoding: 'utf-8', fsenc: 'UTF-8', lang: 'en_US.UTF-8'

*** Bazaar has encountered an internal error.  This probably indicates a
    bug in Bazaar.  You can help us fix it by filing a bug report at
        https://bugs.launchpad.net/bzr/+filebug
    including this traceback and a description of the problem.

ProblemType: Bug
DistroRelease: Ubuntu 16.10
Package: bzr-pipeline 1.5-2
ProcVersionSignature: Ubuntu 4.8.0-34.36-generic 4.8.11
Uname: Linux 4.8.0-34-generic x86_64
ApportVersion: 2.20.3-0ubuntu8.2
Architecture: amd64
CurrentDesktop: Unity
Date: Thu Jan 26 16:19:41 2017
InstallationDate: Installed on 2016-10-22 (96 days ago)
InstallationMedia: Ubuntu 16.10 "Yakkety Yak" - Release amd64 (20161012.2)
PackageArchitecture: all
SourcePackage: bzr-pipeline
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: bzr-pipeline (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug yakkety

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https://bugs.launchpad.net/bugs/1659582

Title:
  bzr-pipeline crashes after "pump"

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