[Bug 990162] Re: [SRU] armhf version is unusable -- task switches will cause sigsegv's

[Chuck Short]

** Description changed:

- Please ignore the data about which packages and such are installed.  I
- had to report this problem on a machine different from the on that
- actually has the error.  The machine with the error is an ARMv7 ArmadaXP
- SoC from Marvell.  This report was created on an x86 system.
- Regardless, the ARMv7 system was using the latest armhf bits from
- Precise.
+ Impact:
  
- Using a very small bit of python (attached as small.py), the problem is
- easily shown.  Task switching does not retain the correct stack
- information to allow the switching to occur reliably.
+ In some certain cases, python-greenlet segfaults on armhf cpus running
+ 12.04. This affects glance from running properly on ARM.
  
- I would recommend first upgrading this package to at least the 0.3.3
- version in Debian unstable; upstream is even newer, with even more ARM
- fixes.  If the 0.3.3 package was being used, the test suite would have
- run and this error would have been seen immediately.  The current 0.3.1
- package does NOT run the test suite at all.
+ [ Test Case ]
  
- I've attached a patch (also submitted to upstream) that may help (at
- least, with 0.3.3, it will); it's not my best work, unfortunately, but I
- really needed to get this working.  The patch attached does two things:
+ 1. Install python-greenlet on a board running an armhf cpu. 
+ 2. Run the script in the attachment called "python code showing the error".
+ 3. See the python script cause a segfault.
  
-    -- Add -fomit-frame-pointer to the build so that r7 can be saved.
+ [ Regression Potental ]
  
-   -- Pulls in the latest version of platform/switch_arm32_gcc.h from
- upstream, and then adds more registers to the ones being saved.
- 
- With this patch, 0.3.3 builds and passes the complete test suite on
- armhf.
- 
- ProblemType: Bug
- DistroRelease: Ubuntu 12.04
- Package: python-greenlet 0.3.1-1ubuntu5
- ProcVersionSignature: Ubuntu 3.2.0-23.36-generic 3.2.14
- Uname: Linux 3.2.0-23-generic x86_64
- NonfreeKernelModules: fglrx
- ApportVersion: 2.0.1-0ubuntu5
- Architecture: amd64
- Date: Fri Apr 27 16:24:54 2012
- ProcEnviron:
-  TERM=xterm
-  PATH=(custom, user)
-  LANG=en_US.UTF-8
-  SHELL=/bin/bash
- SourcePackage: python-greenlet
- UpgradeStatus: Upgraded to precise on 2012-01-09 (109 days ago)
+ None, this bug has been fixed upstream and has already been fixed in
+ Quantal. There has been no side affects of this patch.

** Attachment added: "Debdiff"
   https://bugs.launchpad.net/ubuntu/+source/python-greenlet/+bug/990162/+attachment/3227644/+files/debdiff

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Title:
  [SRU] armhf version is unusable -- task switches will cause sigsegv's

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