Ошибка [1.2.569] падает апарсер с пресетом на основе Net::HTTP при потоках >20

версия апарсера последняя доступная бета (387)
пресет ипользую вот такой:

Спойлер: пресет

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s31MAtb37j9rckoH

Спойлер: содержимое файла suggest-edu-prefixes.txt

&
and
are
buy
can
cant
can't
for
how
like
order
price
purchase
to
what
where
which
who
why
with
.
a
b
c
d
e
f
g
h
i
j
k
l
m
n
o
p
q
r
s
t
u
v
y
x
y
z
1
2
3
4
5
6
7
8
9
0

проблема заключается в том, что больше 20 потоков такой пресет не держит, падает. также можно запустить несколько заданий по 20 потоков и апарсер тоже упадёт. и если после падения попытаться изменить кол-во потоков на поменьше, то при повторном запуске задания (апарсер запускается только с -stoptasks) будет ошибка Error: Iterator: IO error: config/unique/201_iterator/LOCK: Too many open files at build/core.to_build.pl line 8245, <$__ANONIO__> line 1. и после этого задание можно удалить, т.к. оно больше не запустится. в логе при падении апарсера вот такое:

Спойлер: лог

Jan 25 14:27:02.91367 [master] starting task #179 threads: 150
Jan 25 14:27:05.68574 [master] task 179 error Some error
Jan 25 14:27:10.68633 [master] starting task #179 threads: 150
Jan 25 14:27:11.40828 [master] loading before not loaded iterator
Jan 25 14:27:14.54218 [worker/18766] [A-Parser/Worker/18766] end called, pid 18766
Jan 25 14:27:14.54218 [worker/18768] [A-Parser/Worker/18768] end called, pid 18768
Jan 25 14:27:14.54218 [worker/18767] [A-Parser/Worker/18767] end called, pid 18767
Jan 25 14:27:14.54217 [worker/18765] [A-Parser/Worker/18765] end called, pid 18765
Jan 25 14:27:14.54217 [worker/18777] [A-Parser/Worker/18777] end called, pid 18777
Jan 25 14:27:14.75833 [master] cannot commit database HashDB_config/tasks/179_uncompleted.db config/tasks/179_uncompleted.db
Jan 25 14:27:14.77616 [worker/18764] [A-Parser/Worker/18764] end called, pid 18764
Jan 25 14:27:14.78482 [worker/18763] [A-Parser/Worker/18763] end called, pid 18763
Jan 25 14:27:14.79121 [template of 18660] [Template of 18660] exit called, pid 18661