bug#26021: 25.1; GDB/GUD tooltip error

[Live System User]

Hi,

        Not sure how to get a reproducible recipe but while in
        GDB when I do something like C-x C-f (find-file),
        sometimes I get the folloeing error:

Debugger entered--Lisp error: (wrong-type-argument markerp nil)
  marker-buffer(nil)
  (eq (tooltip-event-buffer gud-tooltip-event) (marker-buffer 
gud-overlay-arrow-position))
  (and (eq (tooltip-event-buffer gud-tooltip-event) (marker-buffer 
gud-overlay-arrow-position)))
  eval((and (eq (tooltip-event-buffer gud-tooltip-event) (marker-buffer 
gud-overlay-arrow-position))))
  gud-tooltip-tips((mouse-movement (#<window 12 on *Backtrace*> 2258 (709 . 70) 
227820838 nil 2258 (74 . 3) nil (304 . 16) (9 . 18))))
  run-hook-with-args-until-success(gud-tooltip-tips (mouse-movement (#<window 
12 on *Backtrace*> 2258 (709 . 70) 227820838 nil 2258 (74 . 3) nil (304 . 16) 
(9 . 18))))
  tooltip-timeout(nil)
  apply(tooltip-timeout nil)
  timer-event-handler([t 22719 16734 511876 nil tooltip-timeout (nil) nil 
929999])


    Thanks.



In GNU Emacs 25.1.1 (x86_64-redhat-linux-gnu, GTK+ Version 3.20.9)
 of 2016-10-13 built on buildvm-05.phx2.fedoraproject.org
Windowing system distributor 'Fedora Project', version 11.0.11803000
Configured using:
 'configure --build=x86_64-redhat-linux-gnu
 --host=x86_64-redhat-linux-gnu --program-prefix=
 --disable-dependency-tracking --prefix=/usr --exec-prefix=/usr
 --bindir=/usr/bin --sbindir=/usr/sbin --sysconfdir=/etc
 --datadir=/usr/share --includedir=/usr/include --libdir=/usr/lib64
 --libexecdir=/usr/libexec --localstatedir=/var
 --sharedstatedir=/var/lib --mandir=/usr/share/man
 --infodir=/usr/share/info --with-dbus --with-gif --with-jpeg --with-png
 --with-rsvg --with-tiff --with-xft --with-xpm --with-x-toolkit=gtk3
 --with-gpm=no --with-xwidgets build_alias=x86_64-redhat-linux-gnu
 host_alias=x86_64-redhat-linux-gnu 'CFLAGS=-DMAIL_USE_LOCKF -O2 -g
 -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2
 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4
 -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1
 -m64 -mtune=generic' LDFLAGS=-Wl,-z,relro
 PKG_CONFIG_PATH=:/usr/lib64/pkgconfig:/usr/share/pkgconfig'

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND DBUS GCONF GSETTINGS NOTIFY
ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 XWIDGETS

Important settings:
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Summary

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  line-number-mode: t
  transient-mark-mode: t

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dbusbind inotify dynamic-setting system-font-setting font-render-setting
xwidget-internal move-toolbar gtk x-toolkit x multi-tty
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Memory information:
((conses 16 280744 27843)
 (symbols 48 31766 0)
 (miscs 40 208 289)
 (strings 32 60237 3871)
 (string-bytes 1 1890582)
 (vectors 16 26725)
 (vector-slots 8 863234 55443)
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 (heap 1024 66096 6713))