VNET kernel panic on remove renamed interfaces

[Ayaka Koshibe]

Hi,

This looks identical to the panic that I was seeing. It was just
patched in -CURRENT yesterday (r315192) - maybe it's this?

https://svnweb.freebsd.org/base?view=revision&revision=315192


Ayaka

On Tue, Mar 14, 2017 at 11:25 AM, 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
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