Problem copying from NFS to SD card (crash & reboot)

[gpontis at spamcop.net]

barebox 2012.05.0 (May 18 2012 - 16:56:20)

Board: NVS 10301
Clocks: CPU 400 MHz, master 133 MHz, main 12.000 MHz
registered netconsole as cs1
cfi_flash at cfi_flash0: found cfi flash at 10000000, size 1048576
atmel_mci at mci0: registered as mci0
mci at mci0: registered disk0
atmel_nand: Use On Flash BBT
NAND device: Manufacturer ID: 0x20, Chip ID: 0xda (ST Micro NAND  
256MiB 3,3V 8-bit)
Bad block table found at page 131008, version 0x01
Bad block table found at page 130944, version 0x01
nand_read_bbt: Bad block at 0x0b620000
Malloc space: 0x71f00000 -> 0x73efffff (size 32 MB)
Stack space : 0x71ef8000 -> 0x71f00000 (size 32 kB)
running /env/bin/init...

Hit any key to stop autoboot:  3
barebox / : mkdir /mnt
barebox / : mount /dev/disk0.0 fat /mnt
barebox / : ls /mnt
rootfs.cpio.gz    rootfs.ubi        zImage
barebox / : nfs /var/share/R3/zImage /mnt
open: Is a directory
barebox / : nfs /var/share/R3/zImage /mnt/zImage
phy0: Link is up - 100/Full

Filename '/var/share/R3/zImage'.
         [##########atmel_mci at atmel_mci0: command/data timeout             ]
atmel_mci at atmel_mci0: command/data timeout
BUG: failure at common/block.c:248/block_put()!
BUG!
no stack data available