SAS2LP used to wok great with v5, but since v6 many users start having problems with it (same for SASLP which uses the same driver), many times issues begin after an Unraid upgrade out of the blue, doesn't mean it's the problem, since it doesn't usually makes the server crash, but definitely not recommended.
The last diags you posted are just after rebooting, so not much to see, if it keeps crashing, or you can make it crash, use this then post that syslog.