[Bug 1638917] Re: swift-ring-builder rebalance goes into an infinite loop

[Corey Bryant]

*** This bug is a duplicate of bug 1642538 ***
    https://bugs.launchpad.net/bugs/1642538

This looks to be fixed on more recent versions of swift via:
https://bugs.launchpad.net/swift/+bug/1642538

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https://bugs.launchpad.net/bugs/1638917

Title:
  swift-ring-builder rebalance goes into an infinite loop

Status in swift package in Ubuntu:
  Confirmed

Bug description:
  On Ubuntu 16.04 with a Mitaka cloud the attached ring files cause
  swift-ring-builder to go into an infinite loop when asked to
  rebalance.

  The problem seems to be the following line in place_parts():

              while parts:

  Which seems to assume that parts can never be << 0, but with these
  ring files that assumption breaks.

  I added the following debug statements:

    http://paste.ubuntu.com/23419920/

  To get the following debug output:

    http://paste.ubuntu.com/23419916/

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