Bug#990642: linux-image-4.19.0-17-amd64: kernel panic on xen dom0 with Broadcom Limited NetXtreme II BCM5709

[spi@gmxpro.de]

In preparation for the bug report for upstream I did some more
investigation.

The kernel panic also occurs without bonding interfaces but needs much
more time to happen. With a bonding interface it happens within some
seconds. Without bonding interfaces it needs like a minute with the
network discovery being re-launched for 2 or 3 times. The kernel panic
is still the same about the bnx2 driver.

In the constellation without a bonding interface the kernel panic only
occurs if
- opnsense as a domU is running (this domU bounds all bridged interfaces
as default gateway for all networks)
- sysctl parameter net.bridge.bridge-nf-call-ip6tables is set to 0.

If both conditions are not met no kernel panic oaccurs.

Other IPv6 related sysctl parameters are set on dom0 like
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1


The layer2-iptables settings are
net.bridge.bridge-nf-call-ip6tables = 0 ***


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


net.bridge.bridge-nf-call-arptables = 0




As said, if I don't set the one marked with *** to 0 there is no kernel
panic.

I wonder if this still is a kernel issue but still wouldn't expect a
kernel panic to happen.

Cheers,
spi