globalSAN iSCSI initiator causes RN104 to panic - kmap_atomic+30

I'm not sure how to diagnose this as the logs don't show what happens at the point the iSCSI initator causes the RN104 to lock up. Requires a hard reboot (power cable remove) to restart the unit. Display shows KMAP_ATOMIC+30 and that's it.

kernel log only shows a gap (see Aug 29 entry then reboot Aug 31):

Aug 26 03:19:16 ReadyNAS104 kernel: mvneta d0070000.ethernet eth0: bad rx status 0f830000 (overrun error), size=1023
Aug 29 07:38:21 ReadyNAS104 kernel: mvneta d0070000.ethernet eth0: bad rx status 0f830000 (overrun error), size=1024
-- Reboot --
Aug 31 13:17:37 ReadyNAS104 kernel: Booting Linux on physical CPU 0x0
Aug 31 13:17:37 ReadyNAS104 kernel: Initializing cgroup subsys cpuset
Aug 31 13:17:37 ReadyNAS104 kernel: Initializing cgroup subsys cpu
Aug 31 13:17:37 ReadyNAS104 kernel: Initializing cgroup subsys cpuacct
Aug 31 13:17:37 ReadyNAS104 kernel: Linux version 4.4.79.armada.1 (jenkins@blocks) (gcc version 4.6.4 (Marvell GCC release 20160226-c4af733b 64K MAXPAGESIZE ALIGN) ) #1 SMP Mon Jul 31 15:25:20 PDT 2017

Same with the system log:

Aug 30 18:24:31 ReadyNAS104 connmand[2142]: ntp: adjust (slew): -0.008091 sec
Aug 30 18:41:35 ReadyNAS104 connmand[2142]: ntp: adjust (slew): +0.002593 sec
-- Reboot --
Aug 31 13:17:48 ReadyNAS104 cron[2135]: (CRON) INFO (pidfile fd = 3)
Aug 31 13:17:48 ReadyNAS104 cron[2135]: (CRON) INFO (Running reboot jobs)
Aug 31 13:17:48 ReadyNAS104 wsdd2[2140]: starting.

Only app installed is Plex which has virtually no content (not in use yet). Services active - SMB, Rsync, iTunes, HTTP, HTTPS, SSH

Anyone have any ideas on how to troubleshoot/diagnose this issue?

Firmware 6.8.0