VNET kernel panic on remove renamed interfaces

[Reshad Patuck]

Hi,

I applied the patch @Ayaka mentioned (r315192) against 11-STABLE and ran 
the same test against a complied kernel, and it works now.

Also I found another issue with 11-STABLE that seems to be patched in 12.
I wrote a script to bring up 300 vnet jails on 3 bridges, with a pf router 
jail in between and shut them down.
When I run this script in a loop for some time the system crashes, without 
leaving a crash dump.

Please let me know if there is anything in the PF-VNET-Jails stack I can 
help test.

Are there any plans to backport these patches to 11-STABLE. I would like if 
it is possible to have these in 11.1-RELEASE.

Best regards,

Reshad


On 15 March 2017 01:08:14 GMT+05:30, Ayaka Koshibe <akoshibe at gmail.com> wrote:
>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
>> _______________________________________________
>> freebsd-net at freebsd.org mailing list
>> https://lists.freebsd.org/mailman/listinfo/freebsd-net
>> To unsubscribe, send any mail to
>"freebsd-net-unsubscribe at freebsd.org"