[Bug 219901] [Panic] [if_bridge] panic when destroying interface on bridge over time

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=219901

O. Hartmann <ohartmann at walstatt.org> changed:

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                 CC|                            |ohartmann at walstatt.org

--- Comment #3 from O. Hartmann <ohartmann at walstatt.org> ---
The problem is also still persistent in CURRENT (13.0-CURRENT FreeBSD
13.0-CURRENT #26 r356437: Tue Jan  7 07:19:34 CET 2020 amd64) and it can be
reliably triggered by stopping vnet jails, where the epair is member of a
bridge device.

Also, these PRs seem to be related to this almost two years old bug: PR 238326
and probably this one year old bug PR 234985.

Is anybody investigating this issue? It is also affecting 12.1-RELENG and
12-STABLE systems and it seems the larger the number of jails hosted is, the
more likely is the failure . In our case, we crash one large server with a
couple of Intel 350T2 NICs and ~ 10 -12 jails one EVERY shutdown of the system
or stopping jails via "service jail stop" and it takes one or two attempts to
crash the box by randomly select a jail and stop it via "service jail stop
$name", $name is the jailname to be stopped.

The only secure way to reboot the server is to issue "reboot".

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