We've experienced the following error which we've diagnosed as possibly being caused by the Sign Artist plugin. 

mmap(PROT_NONE) failed Caught fatal signal - signo:6 code:-6 errno:0 addr:0x3ea00004032 Obtained 18 stack frames. #0 0x007f763c6b6980 in (Unknown) #1 0x007f763c2f1fb7 in (Unknown) #2 0x007f763c2f3921 in (Unknown) #3 0x007f763b966256 in (Unknown) #4 0x007f763b9662c3 in (Unknown) #5 0x007f763b9691c3 in (Unknown) #6 0x007f763b96942c in (Unknown) #7 0x007f763b969eb5 in (Unknown) #8 0x007f763d8b9011 in (Unknown) #9 0x007f763d752302 in (Unknown) #10 0x007f763d752496 in (Unknown) #11 0x007f763d7b27a1 in (Unknown) #12 0x007f763d7acc2e in (Unknown) #13 0x007f763d7acc71 in (Unknown) #14 0x007f763d7ad18a in (Unknown) #15 0x007f763d91554e in (Unknown) #16 0x007f763c2d4bf7 in (Unknown) #17 0x0056088856b699 in (Unknown)

The server would reboot and then crash again after 5 minutes with this error. We removed oxide and restarted and were stable, so we've gone through the list of plugins we're using to determine what could be the cause. The reason we thought it was Sign Artist is because it is mentioned in this previous discussion where others have the same error: https://umod.org/community/rust/20584-server-crash-mmap?page=1

After removing sign artist we've been able to boot and stay online without crashing.