Description of problem:

`find` process intermittently end in state

0 Z 700       8114 25341  0  85   5 -     0 do_exi May10 ?        00:00:00 [find] <defunct>

when construction

find ... | while read f; do listing_files2+=( "${f}" ); done

is used.

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

zsh-4.3.11-8.el6

How reproducible:

Intermittently in production

Steps to Reproduce:
1. execute scripts containing construct

find ... | while read f; do listing_files2+=( "${f}" ); done

heavily

Actual results:

0 Z 700       8114 25341  0  85   5 -     0 do_exi May10 ?        00:00:00 [find] <defunct>

observed several times a day

Expected results:

no zombies

Additional info:

Not observed with zsh-5.0.2-19.el7

Backtrace pattern:

#0  0x0000003fb8c3281a in do_sigsuspend (set=0x7fff1485a950) at ../sysdeps/unix/sysv/linux/sigsuspend.c:63
63	  return INLINE_SYSCALL (rt_sigsuspend, 2, CHECK_SIGSET (set), _NSIG / 8);
(gdb) bt
#0  0x0000003fb8c3281a in do_sigsuspend (set=0x7fff1485a950) at ../sysdeps/unix/sysv/linux/sigsuspend.c:63
#1  __sigsuspend (set=0x7fff1485a950) at ../sysdeps/unix/sysv/linux/sigsuspend.c:74
#2  0x000000000047696c in signal_suspend (sig=<value optimized out>, wait_cmd=0) at signals.c:373
#3  0x0000000000447b4f in zwaitjob (job=<value optimized out>, wait_cmd=0) at jobs.c:1300
#4  0x0000000000447d06 in waitjobs () at jobs.c:1345
#5  0x000000000042c12f in execpline (state=<value optimized out>, slcode=<value optimized out>, how=<value optimized out>, last1=0)
    at exec.c:1500
#6  0x000000000042cd67 in execlist (state=0x7fff1485bb90, dont_change_job=1, exiting=0) at exec.c:1207
#7  0x000000000044f29f in execfor (state=0x7fff1485bb90, do_exec=0) at loop.c:159
#8  0x000000000042a604 in execcmd (state=<value optimized out>, input=0, output=0, how=0, last1=2) at exec.c:3124
#9  0x000000000042b656 in execpline2 (state=0x7fff1485bb90, pcode=<value optimized out>, how=18, input=0, output=0, last1=0)
    at exec.c:1640
...
#53 0x000000000042ba18 in execpline (state=0x7fff1485f080, slcode=<value optimized out>, how=18, last1=0) at exec.c:1424
#54 0x000000000042cd67 in execlist (state=0x7fff1485f080, dont_change_job=0, exiting=0) at exec.c:1207
#55 0x000000000042d0b6 in execode (p=0x7f235c355510, dont_change_job=0, exiting=0, context=0x49287e "some_context") at exec.c:1025
#56 0x000000000043fac2 in loop (toplevel=1, justonce=0) at init.c:188
#57 0x0000000000441dfe in zsh_main (argc=<value optimized out>, argv=<value optimized out>) at init.c:1513
#58 0x0000003fb8c1ed1d in __libc_start_main (main=0x40de30 <main>, argc=3, ubp_av=0x7fff1485f468, init=<value optimized out>, 
    fini=<value optimized out>, rtld_fini=<value optimized out>, stack_end=0x7fff1485f458) at libc-start.c:226
---Type <return> to continue, or q <return> to quit---
#59 0x000000000040dd69 in _start ()

Theory (credit to kdudka++) is that it's missing https://sourceforge.net/p/zsh/code/ci/128bf385 patch in el6's zsh.