NFS writes being corrupted?

[Jeff Rizzo <riz%tastylime.net@localhost>]

I got my odroid-c1 back online yesterday with -current, and noticed that 
anything I copied to an NFS-mounted volume would get silently 
corrupted.  (sha1 from the NFS client and on the NFS server read the 
same, though)

I'm about 80% sure this was working around 7.99.9, but for a number of 
reasons it's complicated for me to check older builds, and in any event 
odroid-c1 support is fairly new.  I noticed some changes to the NFS code 
on 15 July ( 
http://mail-index.netbsd.org/source-changes/2015/07/15/msg067309.html ), 
but backing these out does not change the behavior.

Has anyone else seen problems with NFS?  Or with odroid-c1 or awge(4) in 
general?  dmesg below in case it gives any hints:

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 7.99.20 (ODROID-iscsi) #3: Sun Aug  2 21:06:09 PDT 2015
riz%cassava.tastylime.net@localhost:/scratch/evbarm7/obj/sys/arch/evbarm/compile/ODROID-iscsi
total memory = 1024 MB
avail memory = 1007 MB
sysctl_createv: sysctl_create(machine_arch) returned 17
timecounter: Timecounters tick every 10.000 msec
mainbus0 (root)
cpu0 at mainbus0 core 0: 1512 MHz Cortex-A5 r0p1 (Cortex V7A core)
cpu0: DC enabled IC enabled WB disabled EABT branch prediction enabled
cpu0: sctlr: 0xc51c7d
cpu0: actlr: 0x6041
cpu0: revidr: 0x410fc051
cpu0: mpidr: 0x80000200
cpu0: isar: [0]=0x101111 [1]=0x13112111 [2]=0x21232041 [3]=0x11112131, 
[4]=0x11142, [5]=0
cpu0: mmfr: [0]=0x100103 [1]=0x40000000 [2]=0x1230000 [3]=0x102211
cpu0: pfr: [0]=0x1231 [1]=0x11
cpu0: 32KB/32B 2-way L1 VIPT Instruction cache
cpu0: 32KB/32B 4-way write-back-locking-C L1 PIPT Data cache
cpu0: 512KB/32B 8-way write-back L2 PIPT Unified cache
vfp0 at cpu0: NEON MPE (VFP 3.0+), rounding, NaN propagation, denormals
vfp0: mvfr: [0]=0x10110222 [1]=0x11111111
cpu1 at mainbus0 core 1
cpu2 at mainbus0 core 2
cpu3 at mainbus0 core 3
armperiph0 at mainbus0
armgic0 at armperiph0: Generic Interrupt Controller, 256 sources (245 valid)
armgic0: 32 Priorities, 224 SPIs, 5 PPIs, 16 SGIs
a9tmr0 at armperiph0: A5 Global 64-bit Timer (378 MHz)
a9tmr0: interrupting on irq 27
a9wdt0 at armperiph0: A5 Watchdog Timer, default period is 12 seconds
arml2cc0 at armperiph0: ARM PL310 r3p3 L2 Cache Controller (disabled)
arml2cc0: cache enabled
amlogicio0 at mainbus0
amlogiccom0 at amlogicio0 port 0: console
amlogiccom0: interrupting at irq 122
amlogicgpio0 at amlogicio0: GPIO controller
gpio0 at amlogicgpio0 (GPIOX): 22 pins
gpio1 at amlogicgpio0 (GPIOY): 15 pins
gpio2 at amlogicgpio0 (GPIODV): 30 pins
gpio3 at amlogicgpio0 (GPIOH): 6 pins
gpio4 at amlogicgpio0 (GPIOAO): 14 pins
gpio5 at amlogicgpio0 (BOOT): 19 pins
gpio6 at amlogicgpio0 (CARD): 7 pins
genfb0 at amlogicio0: switching to framebuffer console
genfb0: framebuffer at 0xc9e00000, size 1280x720, depth 16, stride 2560
wsdisplay0 at genfb0 kbdmux 1: console (default, vt100 emulation)
wsmux1: connecting to wsdisplay0
wsdisplay0: screen 1-3 added (default, vt100 emulation)
amlogicrng0 at amlogicio0
dwctwo0 at amlogicio0 port 0: USB controller
dwctwo1 at amlogicio0 port 1: USB controller
awge0 at amlogicio0: Gigabit Ethernet Controller
awge0: interrupting on irq 40
awge0: Ethernet address: 00:1e:06:c3:49:c1
rgephy0 at awge0 phy 0: RTL8169S/8110S/8211 1000BASE-T media interface, 
rev. 6
rgephy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseT-FDX, auto
rgephy1 at awge0 phy 1: RTL8169S/8110S/8211 1000BASE-T media interface, 
rev. 6
rgephy1: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseT-FDX, auto
amlogicsdhc0 at amlogicio0 port 1: SDHC controller
amlogicsdhc0: interrupting on irq 110
amlogicrtc0 at amlogicio0: RTC battery not present or discharged
usb0 at dwctwo0: USB revision 2.0
usb1 at dwctwo1: USB revision 2.0
timecounter: Timecounter "clockinterrupt" frequency 100 Hz quality 0
timecounter: Timecounter "a9tmr0" frequency 378000000 Hz quality 500
cpu2: 1512 MHz Cortex-A5 r0p1 (Cortex V7A core)
cpu2: DC enabled IC enabled WB disabled EABT branch prediction enabled
cpu2: sctlr: 0xc51c7d
cpu2: actlr: 0x6041
cpu2: revidr: 0x410fc051
cpu2: mpidr: 0x80000202
cpu2: isar: [0]=0x101111 [1]=0x13112111 [2]=0x21232041 [3]=0x11112131, 
[4]=0x11142, [5]=0
cpu2: mmfr: [0]=0x100103 [1]=0x40000000 [2]=0x1230000 [3]=0x102211
cpu2: pfr: [0]=0x1231 [1]=0x11
cpu2: 32KB/32B 2-way L1 VIPT Instruction cache
cpu2: 32KB/32B 4-way write-back-locking-C L1 PIPT Data cache
cpu2: 512KB/32B 8-way write-back L2 PIPT Unified cache
vfp2 at cpu2: NEON MPE (VFP 3.0+), rounding, NaN propagation, denormals
vfp2: mvfr: [0]=0x10110222 [1]=0x11111111
cpu3: 1512 MHz Cortex-A5 r0p1 (Cortex V7A core)
cpu3: DC enabled IC enabled WB disabled EABT branch prediction enabled
cpu3: sctlr: 0xc51c7d
cpu3: actlr: 0x6041
cpu3: revidr: 0x410fc051
cpu3: mpidr: 0x80000203
cpu3: isar: [0]=0x101111 [1]=0x13112111 [2]=0x21232041 [3]=0x11112131, 
[4]=0x11142, [5]=0
cpu3: mmfr: [0]=0x100103 [1]=0x40000000 [2]=0x1230000 [3]=0x102211
cpu3: pfr: [0]=0x1231 [1]=0x11
cpu3: 32KB/32B 2-way L1 VIPT Instruction cache
cpu3: 32KB/32B 4-way write-back-locking-C L1 PIPT Data cache
cpu3: 512KB/32B 8-way write-back L2 PIPT Unified cache
vfp3 at cpu3: NEON MPE (VFP 3.0+), rounding, NaN propagation, denormals
vfp3: mvfr: [0]=0x10110222 [1]=0x11111111
cpu1: 1512 MHz Cortex-A5 r0p1 (Cortex V7A core)
cpu1: DC enabled IC enabled WB disabled EABT branch prediction enabled
cpu1: sctlr: 0xc51c7d
cpu1: actlr: 0x6041
cpu1: revidr: 0x410fc051
cpu1: mpidr: 0x80000201
cpu1: isar: [0]=0x101111 [1]=0x13112111 [2]=0x21232041 [3]=0x11112131, 
[4]=0x11142, [5]=0
cpu1: mmfr: [0]=0x100103 [1]=0x40000000 [2]=0x1230000 [3]=0x102211
cpu1: pfr: [0]=0x1231 [1]=0x11
cpu1: 32KB/32B 2-way L1 VIPT Instruction cache
cpu1: 32KB/32B 4-way write-back-locking-C L1 PIPT Data cache
cpu1: 512KB/32B 8-way write-back L2 PIPT Unified cache
vfp1 at cpu1: NEON MPE (VFP 3.0+), rounding, NaN propagation, denormals
vfp1: mvfr: [0]=0x10110222 [1]=0x11111111
sdmmc0 at amlogicsdhc0
uhub0 at usb0: vendor 0000 DWC2 root hub, class 9/0, rev 2.00/1.00, addr 1
uhub0: 1 port with 1 removable, self powered
uhub1 at usb1: vendor 0000 DWC2 root hub, class 9/0, rev 2.00/1.00, addr 1
uhub1: 1 port with 1 removable, self powered
ld0 at sdmmc0: <0x03:0x5344:SD8GB:0x30:0x13de638b:0x0e3>
ld0: 7600 MB, 3860 cyl, 64 head, 63 sec, 512 bytes/sect x 15564800 sectors
ld0: 4-bit width, bus clock 50.000 MHz
uhub2 at uhub1 port 1: vendor 05e3 USB2.0 Hub, class 9/0, rev 
2.00/32.98, addr 2
uhub2: multiple transaction translators
uhub2: 4 ports with 4 removable, self powered
uhidev0 at uhub2 port 1 configuration 1 interface 0
uhidev0: CHICONY USB Keyboard, rev 2.00/2.30, addr 3, iclass 3/1
ukbd0 at uhidev0: 8 modifier keys, 6 key codes
wskbd0 at ukbd0: console keyboard, using wsdisplay0
uhidev1 at uhub2 port 1 configuration 1 interface 1
uhidev1: CHICONY USB Keyboard, rev 2.00/2.30, addr 3, iclass 3/0
uhidev1: 3 report ids
uhid0 at uhidev1 reportid 1: input=1, output=0, feature=0
uhid1 at uhidev1 reportid 2: input=1, output=0, feature=0
uhid2 at uhidev1 reportid 3: input=3, output=0, feature=0
umass0 at uhub2 port 2 configuration 1 interface 0
umass0: VT SSD USB 3.0, rev 2.10/1.00, addr 4
umass0: using SCSI over Bulk-Only
scsibus0 at umass0: 2 targets, 1 lun per target
sd0 at scsibus0 target 0 lun 0: <VT, SSD USB 3.0, 0> disk fixed
sd0: 111 GB, 16383 cyl, 16 head, 63 sec, 512 bytes/sect x 234441648 sectors
sd0: GPT GUID: 407bff0e-50be-4a97-b6ef-a6e7b901e5a8
dk0 at sd0: EFI System Partition
dk0: 409600 blocks at 40, type: msdos
dk1 at sd0: pbulk-scratch
dk1: 41943040 blocks at 409640, type: ffs
dk2 at sd0: pbulk-data
dk2: 52428800 blocks at 42352680, type: ffs
dk3 at sd0: pbulk-packages
dk3: 73400320 blocks at 94781480, type: ffs
dk4 at sd0: netbsd-src
dk4: 20971520 blocks at 168181800, type: ffs
dk5 at sd0: odroidroot
dk5: 4194304 blocks at 189153320, type: ffs
dk6 at sd0: odroidhome
dk6: 8388608 blocks at 193347624, type: ffs
iscsi: attached.  major = 203
boot device: dk5
root on dk5
root file system type: ffs
kern.module.path=/stand/evbarm/7.99.20/modules
WARNING: no TOD clock present
WARNING: using filesystem time
WARNING: CHECK AND RESET THE DATE!