VNET kernel panic on remove renamed interfaces

[Reshad Patuck]

Looks like my scripts did not come through.

Here is a link to them

https://paste.ee/p/lB3iE

Best,

Reshad

On 14 March 2017 23:55:23 GMT+05:30, Reshad Patuck <reshadpatuck1 at gmail.com> wrote:
>Hi,
>
>I am trying to use vnet and pf to host multiple (100s of) jails on a
>server with a jailed pf router, which will be spun up and down by a
>script.
>
>I rename the epair interfaces so that I know which jail links to which
>interface (for convenience).
>
>After I delete the jail and renamed epair the kernel panics when I
>attempt to recreate the epair.
>
>I believe this is an issue occurs only when I have renamed the epair.
>
>This issue seems to be fixed in 12-CURRENT as I can not make it crash
>on current. However this continues to happen on 11-STABLE and
>11.0-RELEASE.
>
>I have found these which seem to fix something similar issues:
>https://svnweb.freebsd.org/base?view=revision&sortby=rev&revision=292604
>https://svnweb.freebsd.org/base/projects/vnet/_scripts/jail-vnet-epair-regression01.sh?view=markup
>
>I have attached scripts that crash the system for the latest versions
>on 11.0-RELEASE and 11-STABLE branches.
>
>Can someone help me find where this problem was fixed? (for 12) and if
>there are any plans to backport the fix to the 11 branch.
>
>Also any tips on running 100s of VNET jails on a single box would be
>much appreciated, and if there is anything I can help test I have some
>physical and VMware boxes I can test on.
>
>Kernel version I have tested on:
>FreeBSD FreeBSD-11-RELEASE 11.0-RELEASE-p8 FreeBSD 11.0-RELEASE-p8 #1
>r315007: Fri Mar 10 17:27:30 UTC 2017
>root at FreeBSD-11-RELEASE:/usr/obj/usr/src/sys/VNET amd64
>FreeBSD FreeBSD-11-STABLE 11.0-STABLE FreeBSD 11.0-STABLE #1 r315241:
>Tue Mar 14 12:58:54 UTC 2017
>root at FreeBSD-11-STABLE:/usr/obj/usr/src/sys/VNET amd64
>FreeBSD FreeBSD-12 12.0-CURRENT FreeBSD 12.0-CURRENT #1 r315237: Tue
>Mar 14 10:17:06 UTC 2017 root at FreeBSD-12:/usr/obj/usr/src/sys/VNET
>amd64 
>
>Attached:
>vnet-rename-epair.sh - Create and destroy a VNET jail in a loop while
>renaming the epair interface. This crashes on 11. 
>vnet-no-rename-epair.sh - Create and destroy a VNET jail while not
>renaming the epair interface. This does not crash.
>info.0 - info file from core dump on FreeBSD-11-STABLE
>core.txt.0 - core.txt.0 file from core dump on FreeBSD-11-STABLE
>
>Best regards,
>
>Reshad