ulogd.c:522 error during propagate_results

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Hello all

I thank you for the great package you provided for logging of iptables
flow/policy.

#Issue
 I'm getting a lot of "ulogd.c:522 error during propagate_results" in
the /var/log/ulogd/ulogd.log file.
Which sometimes breaks the ulogd logging functionality.

#Specs
  In my lab, I'm using ulogd-2.0.4-3.el7.lux.1.x86_64 on CentOS 7,
4.6.3-1.el7.elrepo.x86_64.
Mostly, it works, and logs the packets into
/var/log/ulogd/ulogd_syslogemu.log file.
The command to enable NFLOG in iptables
sudo ip netns exec namespace1 iptables -A FORWARD -j NFLOG
--nflog-group 1 --nflog-prefix namespace1

#Config
Here's the configuration I'm using in /etc/netns/namespace1/ulogd.conf
stack=log1:NFLOG,base1:BASE,ifi1:IFINDEX,ip2str1:IP2STR,mac2str1:HWHDR,print1:PRINTPKT,emu1:LOGEMU

[log1]
group=1
netlink_socket_buffer_size=1736704
netlink_socket_buffer_maxsize=1085440
netlink_qthreshold=10
netlink_qtimeout=5

#Question
Is there anything I'm missing, or is this a known bug?

Thank you in advance
Saeed
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