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Created attachment 870157 [details]
Patch file that for current (39-7.el6_4.1) mksh SRC RPM.

Description of problem:


Version-Release number of selected component (if applicable):

mksh-39-7.el6_4.1 (latest 6.5), though it's probably been there pretty well forever.....

How reproducible:

Always.

Steps to Reproduce:
1. PS4='+ `date` '
2. set -x
3. <any command of your chosing>

Actual results:

$ export PS4='+ $(date) '
+ export PS4=+ $(date)
$ ls
/bin/mksh: too many files open in shell
+  date
+ Mon Feb 24 13:36:10 CET 2014 date
+ Mon Feb 24 13:36:10 CET 2014 date
+ Mon Feb 24 13:36:10 CET 2014 date
+ Mon Feb 24 13:36:10 CET 2014 date
+ Mon Feb 24 13:36:10 CET 2014 date
[output truncated]

Expected results:

$ PS4='+ `date` '
$ set -x
$ ls
+ Mon Mar  3 16:27:00 EST 2014 ls
BUILD  BUILDROOT  RPMS	SOURCES  SPECS	SRPMS  tmp
$ 

Additional info:

I have "a" patch that I tested and seems to work.  If you like it, it can just be slapped right in.

Created attachment 870633 [details]
backported fix

This was fixed upstream in version R47.

Test packages can be found here:
https://brewweb.devel.redhat.com/taskinfo?taskID=7140850

That's great.  Will this be brought into the RHEL version?

Oh, yes it is.  Sorry.  I misunderstood your update.  Nevermind.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2017-0727.html