ubuntu-elisp team mailing list archive

[notpeter <1454869@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

An Ubuntu system with multiple cpus corrupts the display while
searching.  This is reproducible via ssh as well as on a local terminal.
I've seen this under Ubuntu 14.04.2 with emacs23  (23.4+1-4.1ubuntu1)
and emacs24 (24.3+1-2ubuntu1).

Here's an askubuntu question with reproduction instructions and a screenshot:
http://askubuntu.com/questions/418546/emacs-screen-drawing-issues-over-ssh

1. emacs ~/.bash_history
2. C-s cd (incremental search for "cd")
3. keep hitting C-s (aka jump to the next search result)

This can be easily reproduced under VirtualBox, create a VirtualBox vm
with two vcpus, search in emacs and terrible things happen.  Reduce to
one vcpu and everything's peachy keen.

Martin Trojer posted a patch to bug-gnu-emacs mailing list which fixed it for me:
https://lists.gnu.org/archive/html/bug-gnu-emacs/2015-03/msg00698.html
https://github.com/martintrojer/emacs/commit/bdff1ff98d02f4307659c052d0b35a40a36f0706

This patch is attached.

** Affects: emacs24 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: trusty utopic

** Patch added: "Fixes emacs search display bug with multiple cpus"
   https://bugs.launchpad.net/bugs/1454869/+attachment/4397016/+files/emacs24-bug17497.diff

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https://bugs.launchpad.net/bugs/1454869

Title:
  emacs23 and emacs24 search display bugs on machines with multiple cpus

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