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kern/50401: iee interface stops working

>Number:         50401
>Category:       kern
>Synopsis:       iee interface stops working
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Nov 03 10:00:00 +0000 2015
>Originator:     Martin Husemann
>Release:        NetBSD 7.99.21
The NetBSD Foundation, Inc.
System: NetBSD 7.99.21 NetBSD 7.99.21 (MOONDANCE) #10: Mon Nov 2 18:03:40 CET 2015 hppa
Architecture: hppa
Machine: hppa

After some time (or load? or randomly?) the iee0 interface on my hppa machine
gets into a bogus state and starts logging an endless stream of:

iee0: iee_intr: receive ring buffer overrun
iee0: iee_intr: resource_err=638
iee0: iee_intr: receive ring buffer overrun
iee0: iee_intr: resource_err=639
iee0: iee_intr: receive ring buffer overrun
iee0: iee_intr: resource_err=640
iee0: iee_intr: receive ring buffer overrun
iee0: iee_intr: resource_err=641

If I am happy and no NFS mount is involved, I can log in on the console
and do:
	ifconfig iee0 down; ifconfig iee0 up

and this will make it recover.

Machine details:

Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
    2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015
    The NetBSD Foundation, Inc.  All rights reserved.
Copyright (c) 1982, 1986, 1989, 1991, 1993
    The Regents of the University of California.  All rights reserved.

NetBSD 7.99.21 (MOONDANCE) #10: Mon Nov  2 18:03:40 CET 2015
HP9000/715/50 (Scorpio)
real mem = 98304 KB (73728 reserved for PROM, 91496 KB used by NetBSD)
avail mem = 89864 KB
timecounter: Timecounters tick every 10.000 msec
mainbus0 (root) [flex fff80000]
pdc0 at mainbus0
power0 at mainbus0: not available
cpu0 at mainbus0 hpa 0xfffbe000 path 8 irq 31: PA7100 (T-Bird) rev 0
cpu0: PCXT, PA-RISC 1.1b, lev 1, cat A, 50 MHz clk
cpu0: shadows, 64K/64K D/I caches, 120 shared TLB, 16 shared BTLB
cpu0: PCXT (Rolex - CMOS-26B) floating point, rev 1
mem0 at mainbus0 hpa 0xfffbf000 path 9: viper rev 0, ctrl 0x19a10001<eisa_den,lpmc_en> size 96MB
sti0 at mainbus0 hpa 0xf4000000 path 0: rev 8.02;10, ID 0x27F1239240A00499
sti0: HPA1991AC19, 2048x1024 frame buffer, 1280x1024x8 display
sti0: 10x20 font type 1, 40 bpc, charset 0-255
asp0 at mainbus0 hpa 0xf0000000 path 2 irq 28: Scorpio rev 1, lan 1 scsi 7
gsc0 at asp0: leds
oosiop0 at gsc0 hpa 0xf0825000 path 2/0/1 irq 9: NCR53C700 rev 0, 50MHz, SCSI ID 7
scsibus0 at oosiop0: 8 targets, 8 luns per target
iee0 at gsc0 hpa 0xf0826000 path 2/0/2 irq 8: Intel 82596DX/SX address 08:00:09:42:eb:9c
hil0 at gsc0 hpa 0xf0821000 path 2/0/3 irq 1
com2 at gsc0 hpa 0xf0823000 path 2/0/4 irq 5: ns16550a, working fifo
com2: console
com3 at gsc0 hpa 0xf0822000 path 2/0/5 irq 6: ns16550a, working fifo
lpt1 at gsc0 hpa 0xf0824000 path 2/0/6 irq 7
"Advanced audio (ext.)" at gsc0 (type 0xa, sv 0x7b) hpa 0xf1000000 path 2/0/8 not configured
timecounter: Timecounter "clockinterrupt" frequency 100 Hz quality 0
timecounter: Timecounter "itimer" frequency 50000000 Hz quality 100
scsibus0: waiting 2 seconds for devices to settle...
wsdisplay0 at sti0 kbdmux 1
wsmux1: connecting to wsdisplay0
hil0: no devices
sd0 at scsibus0 target 6 lun 0: <IBM, DDRS-34560D, DC1B> disk fixed
sd0: 4357 MB, 8387 cyl, 5 head, 212 sec, 512 bytes/sect x 8925000 sectors
sd0: sync (160.00ns offset 8), 8-bit (6.250MB/s) transfers
Kernelized RAIDframe activated
boot device: sd0
root on sd0a dumps on sd0b
root file system type: ffs

not sure, happens "often" for me.


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