[Bug 200319] Bridge+CARP crashes/freezes

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=200319

Oleg Sharoyko <osharoiko at gmail.com> changed:

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                 CC|                            |osharoiko at gmail.com

--- Comment #15 from Oleg Sharoyko <osharoiko at gmail.com> ---
Hello,

I can reliably reproduce this problem on three systems running 12.0 and 11.2.
To reproduce it one needs to send a non negligible amount of traffic towards
the system under test so I cannot provide the exact script but I hope my
instructions are clear and I’m happy to provide as much details as I can.

To reproduce a problem configure the system in the following way:

ifconfig ue0 up # Or any other ethernet interface that you have in the system
ifconfig bridge0 create
ifconfig bridge0 addm ue0
ifconfig bridge0 inet 192.168.0.111/24 vhid 1 advskew 100 pass mekmitasdigoat
pkg install iperf3
iperf3 -s

>From some other machine send traffic towards system under test:

iperf3 -c 192.168.0.111 -u -t 120 -Z -b 100m 

In all of my tests this resulted in immediate (within 2 seconds) lockup of the
network stack on the target system. Excluding bridge interface from the picture
and configuring CARP directly on top of ue0 (also tested with rl0) eliminates
the problem.

I will try to look more into this problem but I'm not familiar with locking in
the kernel. Are there any documents/exmaples/kernel options which can help find
where deadlock happens?

Also, https://reviews.freebsd.org/D3133 had no attention for over a year. But
looks like it has been applied in pfSense and works there
(https://redmine.pfsense.org/issues/8056) is that something woth looking into?

Kind regards,
Oleg

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