Network-related lockup, was Re: bnx(4) lockups?

[Stephen Borrill <netbsd%precedence.co.uk@localhost>]

On Thu, 28 Mar 2019, Masanobu SAITOH wrote:
> > > Back to the first mail:
> > >
> > > > If connected to the Internet and traffic is flowing, it will lock solid 
> > > > after a while
> > >
> > > Does the machine recover from the hard hang after stopping the traffic?
> > > e.g. removing cable.

Removing the cable makes no difference.

> >   New patch:
> >
> >      http://www.netbsd.org/~msaitoh/bnx-n7-20190326-0.dif
> >      http://www.netbsd.org/~msaitoh/bnx-n8-20190326-0.dif
> >      http://www.netbsd.org/~msaitoh/bnx-cur-20190326-0.dif
> >
> > This diff might improve stability on heavy interrupt.
> > It seems that bnx(4) also doesn't support the flow control.
> > I'll add it in a few days.
>
> New patches:
>
> 	http://www.netbsd.org/~msaitoh/bnx-n7-20190328-0.dif
> 	http://www.netbsd.org/~msaitoh/bnx-n8-20190328-0.dif
>
> 	And copy the latest bnxfw.h (rev. 1.5)
> 	http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/dev/microcode/bnx/bnxfw.h

Further testing shows that this is not bnx(4)-specific. I can get the hang 
with wm(4) I350 (and I disabled all the on-board bnx(4) devices). I'm 
certain it's network-related though. I've brought the box up in 
single-user mode with filesystems mounted ready only. If I bring up bnx0 
and run netio to it constantly, it will run for an hour without problems. 
If I bring up bnx1 too and run the same netio test (to bnx0), it hangs 
after a couple of minutes. This rules out storage drivers, firewalling, 
etc.

During some trials I've done an ifconfig bnx1 up after it was running OK 
for an hour and the machine locked immediately (even without assigning an 
address to bnx1).

Note this is an identical kernel to that running on a different model of 
machine adjacent to it faultlessly under continual heavy load. The machine 
itself is OK as it was running XenServer (Linux) without problems 
immediately prior to the NetBSD install.

--
Stephen