From owner-freebsd-stable@freebsd.org  Thu Sep 15 19:09:52 2016
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Date: Thu, 15 Sep 2016 22:09:48 +0300
From: Slawa Olhovchenkov <slw@zxy.spb.ru>
To: John Baldwin <jhb@freebsd.org>
Cc: freebsd-stable@freebsd.org
Subject: Re: nginx and FreeBSD11
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On Thu, Sep 15, 2016 at 11:54:12AM -0700, John Baldwin wrote:

> > > Index: vfs_aio.c
> > > ===================================================================
> > > --- vfs_aio.c	(revision 305811)
> > > +++ vfs_aio.c	(working copy)
> > > @@ -787,6 +787,8 @@ aio_process_rw(struct kaiocb *job)
> > >  	 * aio_aqueue() acquires a reference to the file that is
> > >  	 * released in aio_free_entry().
> > >  	 */
> > > +	KASSERT(curproc->p_vmspace == job->userproc->p_vmspace,
> > > +	    ("%s: vmspace mismatch", __func__));
> > >  	if (cb->aio_lio_opcode == LIO_READ) {
> > >  		auio.uio_rw = UIO_READ;
> > >  		if (auio.uio_resid == 0)
> > > @@ -1054,6 +1056,8 @@ aio_switch_vmspace(struct kaiocb *job)
> > >  {
> > >  
> > >  	vmspace_switch_aio(job->userproc->p_vmspace);
> > > +	KASSERT(curproc->p_vmspace == job->userproc->p_vmspace,
> > > +	    ("%s: vmspace mismatch", __func__));
> > >  }
> > > 
> > > If this panics, then vmspace_switch_aio() is not working for
> > > some reason.
> > 
> > This issuse caused rare, this panic produced with issuse or on any aio
> > request? (this is production server)
> 
> It would panic in the case that we are going to write into the wrong
> process (so about as rare as your issue).

Can I configure automatic reboot (not halted) in this case?