[Asuswrt-merlin] Kernel panic while copying to NFS share

Kernel bug detected[#1]:
Cpu 0
$ 0   : 00000000 7f80ea90 00000001 87c33e28
$ 4   : 875749a0 87c33e2c 000026e1 00000001
$ 8   : 00000001 00000021 87d8a2c8 87d8a248
$12   : 87c33e28 00000000 87d8a1b8 00000000
$16   : 875749a0 000026e0 00000000 ffffffff
$20   : 80314960 80322f1c 8777d128 87c33e28
$24   : 00000001 00000110
$28   : 87c32000 87c33e10 800f50e8 c03da020
Hi    : 0000039c
Lo    : 00024479
epc   : c03da044 nfs_sync_mapping_wait+0x13c/0x47c [nfs]     Tainted: P
ra    : c03da020 nfs_sync_mapping_wait+0x118/0x47c [nfs]
Status: 1100fc03    KERNEL EXL IE
Cause : 00000034
PrId  : 00019749
Modules linked in: nfs lockd sunrpc usbhid hid input_core ipt_set ip_set_iphash ip_set_nethash ip_set ipt_REDIRECT nf_nat_ftp nf_conntrack_ftp ip6table_filter ip6table_mangle zaurus rndis_host net1080 cdc_ether asix usbnet usblp ohci_hcd ehci_hcd ufsd(P) vfat fat ext2 ext3 jbd mbcache usb_storage sg sd_mod scsi_wait_scan scsi_mod usbcore jffs2 zlib_inflate zlib_deflate nf_nat_pptp nf_conntrack_pptp nf_nat_proto_gre nf_conntrack_proto_gre nf_nat_sip nf_conntrack_sip nf_nat_h323 nf_conntrack_h323 wl(P) igs(P) emf(P) bcm57xx et(P)
Process dd (pid: 6830, threadinfo=87c32000, task=877cc000)
Stack : 8777d168 8777d200 00420000 00421000 00000000 00420000 875749a0 87c33e2c
        87c33e2c 80310000 00000000 00000000 00000000 00000000 8777d168 00000000
        87c33e2c 00000000 00000000 8777d200 87c33e90 0041e818 00420000 00421000
        00420000 00420000 00420000 c03db1e4 00420000 00420000 0041e614 2ab3fdb8
        8774cda0 00000001 00000000 7ffffb39 00000000 00000000 00000000 00000000
        ...
Call Trace:
[<c03da044>] nfs_sync_mapping_wait+0x13c/0x47c [nfs]
[<c03db1e4>] nfs_wb_all+0x94/0xec [nfs]
[<c03cc9d4>] nfs_file_flush+0x88/0xe4 [nfs]
[<80079908>] filp_close+0x44/0xb0
[<8007b39c>] sys_close+0xa4/0xe4
[<800114a4>] stack_done+0x20/0x40


Code: 8e020028  38420001  30420001 <00028036> 8e030024  106000ab  3c03c040  8e820008  7c420440
Fatal exception: panic in 5 seconds
Kernel panic - not syncing: Fatal exception
Rebooting in 3 seconds..Please stand by while rebooting the system...