On Fri, May 21, 2021 at 09:08:41AM +0000, Richard Scheffenegger wrote:
> The branch main has been updated by rscheff:
> 
> URL: 
> https://cgit.FreeBSD.org/src/commit/?id=032bf749fd44ac5ff20aab2c3d8e3c05491778ea
> 
> commit 032bf749fd44ac5ff20aab2c3d8e3c05491778ea
> Author:     Richard Scheffenegger <rsch...@freebsd.org>
> AuthorDate: 2021-05-21 09:00:53 +0000
> Commit:     Richard Scheffenegger <rsch...@freebsd.org>
> CommitDate: 2021-05-21 09:07:51 +0000
> 
>     [tcp] Keep socket buffer locked until upcall
>     
>     r367492 would unlock the socket buffer before eventually calling the 
> upcall.
>     This leads to problematic interaction with NFS kernel server/client 
> components
>     (MP threads) accessing the socket buffer with potentially not correctly 
> updated
>     state.

The RACK change at least appears to have introduced a bug:

https://syzkaller.appspot.com/bug?id=d7abacdaf60c556dbfa05f15f460cd7174e974ba
https://syzkaller.appspot.com/bug?id=650a391473e34b753b280db1c9c97918d23c6cdb
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