kern/53749: NFS failure / sk driver bug?

[martin%NetBSD.org@localhost]

>Number:         53749
>Category:       kern
>Synopsis:       NFS failure / sk driver bug?
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Nov 27 19:25:00 +0000 2018
>Originator:     Martin Husemann
>Release:        NetBSD 8.99.26
>Organization:
The NetBSD Foundation, Inc.
>Environment:
System: NetBSD night-porter.duskware.de 8.99.25 NetBSD 8.99.25 (PORTER) #7: Thu Nov 8 10:00:36 CET 2018 martin%seven-days-to-the-wolves.aprisoft.de@localhost:/work/src/sys/arch/i386/compile/PORTER i386
Architecture: i386
Machine: i386
>Description:

Since upgrading the kernel on this machine I can not NFS mount volumes
from a nearby (gigE connected to the same switch) server running NetBSD 7.2
any more.

I suspect bugs in the sk driver, pushed into effect by the TCP mount
changes or something.


pci2: i/o space, memory space enabled
skc0 at pci2 dev 5 function 0: ioapic0 pin 22
skc0: interrupt moderation is 0 us
skc0: 3Com Gigabit LOM (3C940) rev. (0x1)
sk0 at skc0 port A: Ethernet address 00:0e:a6:28:e3:ec
makphy0 at sk0 phy 0: Marvell 88E1011 Gigabit PHY, rev. 3
makphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseT, 1000baseT-FDX, auto
skc0: interrupt moderation is 1000 us



>How-To-Repeat:
no idea, probably needs this exact hardware + switch and network environment.

>Fix:
n/a