The incompatible drivers & platforms that you're using seem to be the root cause of the PSOD
- SRP initiator mlnx_ofed_esxi ver1.8.2.4 is not supporting ESXi 6.
- It support Esxi5.X only, which proved to work fine in your case
- As for iSER over RoCE v1 - ConnectX-3(10G 40G) is supported with Esxi6.and using mlnx eth driver v1.9.10.5, yet Solaris OS as a target was not tested therefore we cannot commit stable workability
Suggesting to approach Mellanox rlease note & user-manual to get more insight on the iSER supported oprtions
http://www.mellanox.com/page/products_dyn?product_family=29