sosreport loads the bridge kernel module unintentionally, which sets net.bridge.bridge-nf-call-arptables = 1

Issue

• When sosreport is run, some kernel modules are loaded as a side effect; the loading of unwanted kernel modules consumes memory and may cause other issues
• The output of sysctl -a changes after a run of sosreport due to the bridge kernel module being loaded
• The bridge module's sysctls are initialized to their defaults, instead of being properly initialized via /etc/sysctl.conf

• Despite not having any bridge interfaces configured, you find you have these set in sysctl -a output:

  net.bridge.bridge-nf-call-arptables = 1
  net.bridge.bridge-nf-call-iptables = 1
  net.bridge.bridge-nf-call-ip6tables = 1