Comment 19 for bug 1448149

possible is this the problem?

[ 580.953497] audit: type=1400 audit(1461329763.740:651721): apparmor="DENIED" operation="file_inherit" profile="/usr/sbin/squid//squidguard" pid=10372 comm="squidGuard" family="unix" sock_type="stream" protocol=0 requested_mask="send receive" denied_mask="send receive" addr=none peer_addr=none peer="/usr/sbin/squid"
[ 580.953505] audit: type=1400 audit(1461329763.740:651722): apparmor="DENIED" operation="file_inherit" profile="/usr/sbin/squid" pid=10372 comm="squidGuard" family="unix" sock_type="stream" protocol=0 requested_mask="send receive" denied_mask="send receive" addr=none peer_addr=none peer="/usr/sbin/squid//squidguard"
[ 580.953516] audit: type=1400 audit(1461329763.740:651723): apparmor="DENIED" operation="file_inherit" profile="/usr/sbin/squid//squidguard" pid=10372 comm="squidGuard" family="unix" sock_type="stream" protocol=0 requested_mask="send receive" denied_mask="send receive" addr=none peer_addr=none peer="/usr/sbin/squid"
[ 580.953520] audit: type=1400 audit(1461329763.740:651724): apparmor="DENIED" operation="file_inherit" profile="/usr/sbin/squid" pid=10372 comm="squidGuard" family="unix" sock_type="stream" protocol=0 requested_mask="send receive" denied_mask="send receive" addr=none peer_addr=none peer="/usr/sbin/squid//squidguard"
[ 580.953532] audit: type=1400 audit(1461329763.740:651725): apparmor="DENIED" operation="file_inherit" profile="/usr/sbin/squid//squidguard" name="/var/log/squid/cache.log" pid=10372 comm="squidGuard" requested_mask="ra" denied_mask="ra" fsuid=13 ouid=13
[ 580.953910] audit: type=1400 audit(1461329763.740:651726): apparmor="DENIED" operation="file_mprotect" profile="/usr/sbin/squid//squidguard" name="/usr/bin/squidGuard" pid=10370 comm="squidGuard" requested_mask="r" denied_mask="r" fsuid=13 ouid=0
[ 580.953966] audit: type=1400 audit(1461329763.740:651727): apparmor="DENIED" operation="file_perm" info="Failed name lookup - disconnected path" error=-13 profile="/usr/sbin/squid//squidguard" name="apparmor/.null" pid=10370 comm="squidGuard" requested_mask="w" denied_mask="w" fsuid=13 ouid=0
[ 580.957457] audit: type=1400 audit(1461329763.744:651728): apparmor="DENIED" operation="file_mprotect" profile="/usr/sbin/squid//squidguard" name="/usr/bin/squidGuard" pid=10372 comm="squidGuard" requested_mask="r" denied_mask="r" fsuid=13 ouid=0
[ 580.957472] audit: type=1400 audit(1461329763.744:651729): apparmor="DENIED" operation="file_perm" info="Failed name lookup - disconnected path" error=-13 profile="/usr/sbin/squid//squidguard" name="apparmor/.null" pid=10372 comm="squidGuard" requested_mask="w" denied_mask="w" fsuid=13 ouid=0
[ 580.957811] audit: type=1400 audit(1461329763.744:651730): apparmor="DENIED" operation="file_inherit" profile="/usr/sbin/squid//squidguard" pid=10374 comm="squidGuard" family="unix" sock_type="stream" protocol=0 requested_mask="send receive" denied_mask="send receive" addr=none peer_addr=none peer="/usr/sbin/squid"

Any Hints?