Hi,

Lately, I have been facing this issue in the emacs built from master
branch. I haven't yet seen this error occur on emacs 24.4.

I see it happen now and then and haven't been able to consistently
reproduce it but here is the backtrace. I have not been able to create this
error on "emacs -Q".

I get this error when I am trying to quit isearch. I don't know if this
happens when I try to quit after I tried to search for a term that failed
to be found in the buffer or when I try to quit after a successful search
hit.

But once this started happening, repeated C-g hits keep on throwing this
error and I can't quit isearch.

Then the only way is to restart emacs.

Debugger entered--Lisp error: (void-variable cursor-sensor-inhibit)
  isearch-done(t)
  isearch-cancel()
  isearch-abort()
  funcall-interactively(isearch-abort)
  #<subr call-interactively>(isearch-abort nil nil)
  ad-Advice-call-interactively(#<subr call-interactively> isearch-abort nil
nil)
  apply(ad-Advice-call-interactively #<subr call-interactively>
(isearch-abort nil nil))
  call-interactively(isearch-abort nil nil)
  command-execute(isearch-abort)


In GNU Emacs 25.0.50.2 (x86_64-unknown-linux-gnu, GTK+ Version 2.10.4)
 of 2015-05-05 on ...
Windowing system distributor `The X.Org Foundation', version 11.0.60900000
System Description: Red Hat Enterprise Linux Client release 5.10 (Tikanga)

Configured using:
 `configure --prefix=/home/kmodi/usr_local/apps/emacs/master
 CPPFLAGS=-fgnu89-inline'

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GCONF GSETTINGS
NOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE LIBOTF XFT ZLIB

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Minor modes in effect:
  global-auto-complete-mode: t
  minibuffer-line-mode: t
  guide-key-mode: t
  desktop-save-mode: t
  pdf-occur-global-minor-mode: t
  global-anzu-mode: t
  anzu-mode: t
  recentf-mode: t
  winner-mode: t
  global-undo-tree-mode: t
  undo-tree-mode: t
  projectile-global-mode: t
  projectile-mode: t
  global-page-break-lines-mode: t
  keyfreq-autosave-mode: t
  keyfreq-mode: t
  diff-auto-refine-mode: t
  ido-ubiquitous-mode: t
  ido-vertical-mode: t
  flx-ido-mode: t
  global-hungry-delete-mode: t
  hungry-delete-mode: t
  volatile-highlights-mode: t
  global-hi-lock-mode: t
  hi-lock-mode: t
  global-hardcore-mode: t
  hardcore-mode: t
  drag-stuff-global-mode: t
  drag-stuff-mode: t
  ido-everywhere: t
  ace-window-display-mode: t
  global-adaptive-wrap-prefix-mode: t
  adaptive-wrap-prefix-mode: t
  display-time-mode: t
  popwin-mode: t
  which-function-mode: t
  shell-dirtrack-mode: t
  global-modi-mode: t
  modi-mode: t
  override-global-mode: t
  save-place-mode: t
  show-paren-mode: t
  delete-selection-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  column-number-mode: t
  line-number-mode: t