From https://ftp.gnu.org/gnu/bash/bash-4.4-patches/bash44-005

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

			     BASH PATCH REPORT
			     =================

Bash-Release:	4.4
Patch-ID:	bash44-005

Bug-Reported-by:	Dr. Werner Fink <werner@suse.de>
Bug-Reference-ID:	<20161107100936.ajnojd7dspirdflf@noether.suse.de>
Bug-Reference-URL:	http://lists.gnu.org/archive/html/bug-bash/2016-11/msg00054.html

Bug-Description:

Under certain circumstances, a simple command is optimized to eliminate a
fork, resulting in an EXIT trap not being executed.

Patch (apply with `patch -p0'):

*** a/bash-4.4/builtins/evalstring.c	2016-08-11 14:18:51.000000000 -0400
--- b/builtins/evalstring.c	2016-11-08 15:05:07.000000000 -0500
***************
*** 105,114 ****
  	  *bash_input.location.string == '\0' &&
  	  command->type == cm_simple &&
- #if 0
  	  signal_is_trapped (EXIT_TRAP) == 0 &&
  	  signal_is_trapped (ERROR_TRAP) == 0 &&
- #else
  	  any_signals_trapped () < 0 &&
- #endif
  	  command->redirects == 0 && command->value.Simple->redirects == 0 &&
  	  ((command->flags & CMD_TIME_PIPELINE) == 0) &&
--- 105,111 ----
*** a/bash-4.4/patchlevel.h	2016-06-22 14:51:03.000000000 -0400
--- b/patchlevel.h	2016-10-01 11:01:28.000000000 -0400
***************
*** 26,30 ****
     looks for to find the patch level (for the sccs version string). */
  
! #define PATCHLEVEL 4
  
  #endif /* _PATCHLEVEL_H_ */
--- 26,30 ----
     looks for to find the patch level (for the sccs version string). */
  
! #define PATCHLEVEL 5
  
  #endif /* _PATCHLEVEL_H_ */