Panic: 12.2 fails to use VIMAGE jails

[Kristof Provost]

On 8 Dec 2020, at 0:34, Peter wrote:
> Hi Kristof,
>   it's great to read You!
>
> On Mon, Dec 07, 2020 at 09:11:32PM +0100, Kristof Provost wrote:
>
> ! That smells a lot like the epair/vnet issues in bugs 238870, 234985, 
> 244703,
> ! 250870.
>
> epair? No. It is purely Netgrh here.
>
Yeah, the bug is not exclusive to epair but that’s where it’s most 
easily seen.

> ! I pushed a fix for that in CURRENT in r368237. It’s scheduled to 
> go into
> ! stable/12 sometime next week, but it’d be good to know that it 
> fixes your
> ! problem too before I merge it.
> ! In other words: can you test a recent CURRENT? It’s likely fixed 
> there, and
> ! if it’s not I may be able to fix it quickly.
>
>
> Oh my Gods. No offense meant, but this is not really a good time
> for that. This is the most horrible upgrade I experienced in 25 years
> FreeBSD (and it was prepared, 12.2 did run fine on the other machine).
>
> I have issue with mem config
> https://forums.freebsd.org/threads/fun-with-upgrading-sysctl-unknown-oid-vm-pageout_wakeup_thresh.77955/
> I have issue with damaged filesystem, for no apparent reason
> https://forums.freebsd.org/threads/no-longer-fun-with-upgrading-file-offline.77959/
>
> Then I have this issue here which is now gladly workarounded
> https://forums.freebsd.org/threads/panic-12-2-does-not-work-with-jails.77962/post-486365
>
> and when I then dare to have a look at my applications, they look like
> sheer horror, segfaults all over, and I don't even know where to begin
> with these.
>
>
> Other option: can you make this fix so that I can patch it into 12.2
> source and just redeploy?
>
Try 
http://people.freebsd.org/~kp/0001-if-Fix-panic-when-destroying-vnet-and-epair-simultan.patch

That’s currently running the regression tests that used to provoke the 
panic nearly instantly, and no panics so far.

Best regards.
Kristof