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[dino99 <669160@xxxxxxxxxxxxxxxxxx>]

This is no more a supported version now

** Changed in: eglibc (Ubuntu)
       Status: Confirmed => Invalid

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https://bugs.launchpad.net/bugs/669160

Title:
  slow emulation warning when loading libgomp.so.1

Status in eglibc package in Ubuntu:
  Invalid

Bug description:
  The issue happens on lucid instances running on ec2. Loading
  /usr/lib/libgomp.so.1 takes a long time (~10 seconds) and the
  following warning appears in dmesg:

  ** WARNING: Currently emulating unsupported memory accesses  ** 
  **          in /lib/tls glibc libraries. The emulation is    ** 
  **          slow. To ensure full performance you should      ** 
  **          install a 'xen-friendly' (nosegneg) version of   ** 
  **          the library, or disable tls support by executing ** 
  **          the following as root:                           ** 
  **          mv /lib/tls /lib/tls.disabled                    ** 

  To reproduce:
   - launch a lucid instance from ami-a403f7cd
   - apt-get install libgomp1
   - load /usr/lib/libgomp.so.1, eg
       perl -MDynaLoader -e 'DynaLoader::dl_load_file("/usr/lib/libgomp.so.1")'
    or run an executable that uses it, eg 'convert' from the imagemagick package.

  A weird thing is that libgomp1 seems to be normally using the nosegneg
  version:

  ldd /usr/lib/libgomp.so.1
  	linux-gate.so.1 =>  (0xb77e2000)
  	librt.so.1 => /lib/tls/i686/nosegneg/librt.so.1 (0xb77c1000)
  	libpthread.so.0 => /lib/tls/i686/nosegneg/libpthread.so.0 (0xb77a8000)
  	libc.so.6 => /lib/tls/i686/nosegneg/libc.so.6 (0xb764a000)
  	/lib/ld-linux.so.2 (0xb77e3000)

  Is it a false warning? Deleting /lib/tls does not help.

  Note also that on maverick (ami-1a837773) this issue does _not_ exist,
  and ldd output is different:

  ldd /usr/lib/libgomp.so.1
  	linux-gate.so.1 =>  (0xb779f000)
  	librt.so.1 => /lib/librt.so.1 (0xb7780000)
  	libpthread.so.0 => /lib/libpthread.so.0 (0xb7766000)
  	libc.so.6 => /lib/libc.so.6 (0xb7608000)
  	/lib/ld-linux.so.2 (0xb77a0000)

  ProblemType: Bug
  DistroRelease: Ubuntu 10.04
  Package: libc6-xen 2.11.1-0ubuntu7.5
  ProcVersionSignature: Ubuntu 2.6.32-309.18-ec2 2.6.32.21+drm33.7
  Uname: Linux 2.6.32-309-ec2 i686
  Architecture: i386
  Date: Sun Oct 31 16:52:41 2010
  Ec2AMI: ami-a403f7cd
  Ec2AMIManifest: ubuntu-images-us/ubuntu-lucid-10.04-i386-server-20101020.manifest.xml
  Ec2AvailabilityZone: us-east-1b
  Ec2InstanceType: m1.small
  Ec2Kernel: aki-6603f70f
  Ec2Ramdisk: unavailable
  ProcEnviron:
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: eglibc

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