[Bug 1558370] Re: wish (and gitk) crashes when window is closed

[Stephen Warren]

The same issue happens when running:
gdb --args wish /usr/bin/gitk -- -n 100
(or just "gitk -n 100" if not running under gdb)

The same issue repros when closing the window in the following ways:
- Clicking the close "x" icon on the window title bar
- Selecting close from the window's menu (in XFCE the button in the top-left of the window title bar)
- In gitk, selecting File -> Close

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Title:
  wish (and gitk) crashes when window is closed

Status in tcltk-defaults package in Ubuntu:
  New

Bug description:
  When the user closes the window that wish displays (e.g. types CTRL+F4
  in XFCE), wish experiences a segfault. This can be reproduced either
  by simply running "wish", or by running a wish-based application such
  as gitk.

  $ gdb wish
  GNU gdb (Ubuntu 7.11-0ubuntu1) 7.11
  Copyright (C) 2016 Free Software Foundation, Inc.
  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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  There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
  and "show warranty" for details.
  This GDB was configured as "x86_64-linux-gnu".
  Type "show configuration" for configuration details.
  For bug reporting instructions, please see:
  <http://www.gnu.org/software/gdb/bugs/>.
  Find the GDB manual and other documentation resources online at:
  <http://www.gnu.org/software/gdb/documentation/>.
  For help, type "help".
  Type "apropos word" to search for commands related to "word"...
  Reading symbols from wish...(no debugging symbols found)...done.
  (gdb) r
  Starting program: /usr/bin/wish 
  [Thread debugging using libthread_db enabled]
  Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
  % [New Thread 0x7ffff3d1e700 (LWP 25046)]

  << Give wish window focus, type CTRL+F4 >>

  Thread 1 "wish" received signal SIGSEGV, Segmentation fault.
  __lll_unlock_elision (lock=0x7ffff7a7b900 <notifierMutex>, private=0) at ../sysdeps/unix/sysv/linux/x86/elision-unlock.c:29
  29	../sysdeps/unix/sysv/linux/x86/elision-unlock.c: No such file or directory.
  (gdb) bt
  #0  __lll_unlock_elision (lock=0x7ffff7a7b900 <notifierMutex>, private=0) at ../sysdeps/unix/sysv/linux/x86/elision-unlock.c:29
  #1  0x00007ffff6039cd8 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:94
  #2  0x00007ffff780f0f7 in Tcl_FinalizeNotifier () from /usr/lib/x86_64-linux-gnu/libtcl8.6.so
  #3  0x00007ffff77cec5d in ?? () from /usr/lib/x86_64-linux-gnu/libtcl8.6.so
  #4  0x00007ffff7792549 in ?? () from /usr/lib/x86_64-linux-gnu/libtcl8.6.so
  #5  0x00007ffff7792346 in Tcl_Exit () from /usr/lib/x86_64-linux-gnu/libtcl8.6.so
  #6  0x00007ffff7acf0e0 in Tk_MainEx () from /usr/lib/x86_64-linux-gnu/libtk8.6.so
  #7  0x000000000040094c in ?? ()
  #8  0x00007ffff7323a00 in __libc_start_main (main=0x400920, argc=1, argv=0x7fffffffe2f8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, 
      stack_end=0x7fffffffe2e8) at libc-start.c:289
  #9  0x0000000000400989 in _start ()

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: tk 8.6.0+9
  ProcVersionSignature: Ubuntu 4.4.0-13.29-generic 4.4.5
  Uname: Linux 4.4.0-13-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_modeset nvidia
  ApportVersion: 2.20-0ubuntu3
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Wed Mar 16 22:51:17 2016
  InstallationDate: Installed on 2016-03-03 (14 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160122.2)
  SourcePackage: tcltk-defaults
  UpgradeStatus: No upgrade log present (probably fresh install)

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