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

[James Troup]

Public bug reported:

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/

** Affects: swift (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: canonical-bootstack

** Attachment added: "account.builder"
   https://bugs.launchpad.net/bugs/1638917/+attachment/4771793/+files/account.builder

** Tags added: canonical-bootstack

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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:
  New

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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