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Infinite loop in parsing <()?

Hi,

% uname -a
Linux zorya 2.6.32-ARCH #1 SMP PREEMPT Tue Feb 23 19:43:46 CET 2010 x86_64 Genuine Intel(R) CPU U4100 @ 1.30GHz GenuineIntel GNU/Linux

% echo $ZSH_VERSION $ZSH_PATCHLEVEL 
4.3.10 1.4705

% cat <(echo foo | sort)
# 100% CPU usage
^C
(gdb) bt
#0  0x00007ffff74290ae in memcpy () from /lib/libc.so.6
#1  0x000000000044f514 in realloc ()
#2  0x000000000044f7a9 in zrealloc ()
#3  0x0000000000465ec4 in ?? ()
#4  0x000000000046713a in ?? ()
#5  0x0000000000467ebe in ?? ()
#6  0x0000000000468033 in ?? ()
#7  0x00000000004680cc in ?? ()
#8  0x000000000046816b in ?? ()
#9  0x0000000000468289 in ?? ()
#10 0x0000000000469634 in parse_list ()
#11 0x00000000004252f1 in parse_string ()
#12 0x00000000004255d6 in ?? ()
#13 0x000000000042b96f in getproc ()
#14 0x0000000000477e2c in ?? ()
#15 0x000000000047c2b5 in prefork ()
#16 0x0000000000426b47 in ?? ()
#17 0x0000000000428ed6 in ?? ()
#18 0x0000000000429286 in ?? ()
#19 0x000000000042a577 in execlist ()
#20 0x000000000042a7e3 in execode ()
#21 0x000000000043ce48 in loop ()
#22 0x000000000043dc8e in zsh_main ()
#23 0x00007ffff73c7b6d in __libc_start_main () from /lib/libc.so.6
#24 0x000000000040d8a9 in _start ()

For mysterious reasons,
% cat <(echo foo)
% cat <(echo foo | uname)
% cat <(echo foo | wc)
all work fine.

-- 
Christian Neukirchen  <chneukirchen@xxxxxxxxx>  http://chneukirchen.org
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