[Bug 1007457] Re: Bogus FPE on underflow for exp(double)

[Brian Murray]

Hello Peter, or anyone else affected,

Accepted eglibc into precise-proposed. The package will build now and be
available at http://launchpad.net/ubuntu/+source/eglibc/2.15-0ubuntu10.3
in a few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to
enable and use -proposed.  Your feedback will aid us getting this update
out to other Ubuntu users.

If this package fixes the bug for you, please change the bug tag from
verification-needed to verification-done.  If it does not, change the
tag to verification-failed.  In either case, details of your testing
will help us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Tags removed: verification-done

** Tags added: verification-needed

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https://bugs.launchpad.net/bugs/1007457

Title:
  Bogus FPE on underflow for exp(double)

Status in “eglibc” package in Ubuntu:
  Fix Released
Status in “eglibc” source package in Precise:
  Fix Committed

Bug description:
  SRU Justification:

  [Impact]
  exp() in eglibc causes occasional FP crashes.

  [Development Fix]
  This is fixed in quantal.

  [Stable Fix]
  The fix can be backported to quantal.

  [Test Case]
  Test case is documented in the upstream bug:
  http://sourceware.org/bugzilla/show_bug.cgi?id=13705

  [Regression Potential]
  Changes  __kernel_standard_f to  __kernel_standard in __exp in eglibc.

  --

  
  Glibc version 2.15 has a bug causing spurious FP crashes when calling exp(). It has been reported here:

  http://sourceware.org/bugzilla/show_bug.cgi?id=13705

  You can find all the details, including a testcase and the patch for
  libm in this report. I found that the 64-bit version of precise ships
  a version of glibc that still has this bug. I have not tested the
  32-bit version, but I assume it has the same problem.

  I am one of the developers of the open source code Cloudy and this bug
  renders our code completely non-functional. I would therefore like to
  urge you to ship this patch as an update for the precise distribution,
  especially since this is a LTS release.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: libc6 2.15-0ubuntu10
  ProcVersionSignature: Ubuntu 3.2.0-24.39-generic 3.2.16
  Uname: Linux 3.2.0-24-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.0.1-0ubuntu8
  Architecture: amd64
  Date: Fri Jun  1 16:33:54 2012
  InstallationMedia: Kubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
  ProcEnviron:
   LC_TIME=en_DK.utf8
   TERM=vt100
   LANG=en_US.UTF-8
   SHELL=/bin/tcsh
  SourcePackage: eglibc
  UpgradeStatus: Upgraded to precise on 2012-05-07 (25 days ago)

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