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

[Peter van Hoof]

** Tags removed: verification-needed
** Tags added: verification-done

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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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