Re: amd64 7.9 GENERIC.MP: reproducible panic a few minutes after

On Tue, May 19, 2026 at 03:49:18PM +0200, Renaud Allard wrote:
> From: Renaud Allard <[email protected]>
> To: [email protected]
> Subject: amd64 7.9 GENERIC.MP: reproducible panic a few minutes after
> Date: Tue, 19 May 2026 15:49:18 +0200
> 
> boot on ProLiant DL360 G7
> Reply-To: 
> 
> 7.9 release amd64 bsd.mp panics reproducibly about one minute after
> boot on a HP ProLiant DL360 G7. Rolling back to 7.8 GENERIC.MP on
> the same hardware and configuration makes the box stable again.
> 
> I reinstalled 7.9 twice from different sources to be sure.
> 

I tried to replicate the behaviour using 3 VMs without success
on a 95 minutes stress test with iperf

     +--------+        +----------+      +--------+                                                                   
     |  VM3   |  LAN   |   VM1    | WAN  |  VM2   |                                                                   
     |  lan   |--------|  router  |------|  ISP   |                                                                   
     |        |  em1   |em2    em1|  em1 |        |                                                                   
     +--------+        +----------+      +--------+                                                                   

Everything the DL360's stack would do: wg encap -> wg_deliver_out on
softnet -W wg_send -> sosend -> udp_output -> ip_output ->
pppoe -> sppp -> em -> vSwitch; and the reverse direction.
Plus periodic carp flap + wg rehandshake.

The only differences being the chipset and a simpler pf ruleset