[Bug 820134] [NEW] libfontconfig causes SIGBUS due to mmap and NFS interaction.

[Alec Warner]

Public bug reported:

https://bugs.freedesktop.org/show_bug.cgi?id=39278

Summarized:

man mmap specifies the occasions when sigbus is sent:

       SIGBUS Attempted  access  to  a  portion  of the buffer that does not correspond to the file (for
              example, beyond the end of the file, including the case where another  process  has  trun‐
              cated the file).

If users are using homedirectories on NFS; a simple NFS failure may
cause a file size to change.

Users originally reported this problem running eclipse and seeing 3-4
crashes per day.

I believe the workaround we are proposing is to modify
/etc/fonts/fonts.conf

<!-- Font cache directory list -->

        <cachedir>/var/cache/fontconfig</cachedir>
        <cachedir>~/.fontconfig</cachedir>
        <config>
and just remove the ~/.fontconfig section (possibly replacing it with something on local disk if that is supported.)


antarus at goats2 /etc/fonts $ lsb_release -rd
Description:    Ubuntu 10.04.2 LTS
Release:        10.04


antarus at goats2 /etc/fonts $ apt-cache policy fontconfig
fontconfig:
  Installed: 2.8.0-2ubuntu1
  Candidate: 2.8.0-2ubuntu1

I expect fontconfig to handle mmap's properly. Upstream is aware of the problem but I don't see a fix yet.
The application SIGBUS's

** Affects: fontconfig
     Importance: Unknown
         Status: Unknown

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

** Bug watch added: freedesktop.org Bugzilla #39278
   http://bugs.freedesktop.org/show_bug.cgi?id=39278

** Also affects: fontconfig via
   http://bugs.freedesktop.org/show_bug.cgi?id=39278
   Importance: Unknown
       Status: Unknown

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https://bugs.launchpad.net/bugs/820134

Title:
  libfontconfig causes SIGBUS due to mmap and NFS interaction.

Status in Fontconfig - Font Configuration Library:
  Unknown
Status in “fontconfig” package in Ubuntu:
  New

Bug description:
  https://bugs.freedesktop.org/show_bug.cgi?id=39278

  Summarized:

  man mmap specifies the occasions when sigbus is sent:

         SIGBUS Attempted  access  to  a  portion  of the buffer that does not correspond to the file (for
                example, beyond the end of the file, including the case where another  process  has  trun‐
                cated the file).

  If users are using homedirectories on NFS; a simple NFS failure may
  cause a file size to change.

  Users originally reported this problem running eclipse and seeing 3-4
  crashes per day.

  I believe the workaround we are proposing is to modify
  /etc/fonts/fonts.conf

  <!-- Font cache directory list -->

          <cachedir>/var/cache/fontconfig</cachedir>
          <cachedir>~/.fontconfig</cachedir>
          <config>
  and just remove the ~/.fontconfig section (possibly replacing it with something on local disk if that is supported.)

  
  antarus at goats2 /etc/fonts $ lsb_release -rd
  Description:    Ubuntu 10.04.2 LTS
  Release:        10.04

  
  antarus at goats2 /etc/fonts $ apt-cache policy fontconfig
  fontconfig:
    Installed: 2.8.0-2ubuntu1
    Candidate: 2.8.0-2ubuntu1

  I expect fontconfig to handle mmap's properly. Upstream is aware of the problem but I don't see a fix yet.
  The application SIGBUS's

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