this one might help a bit more

37.188 Verbose Scenario.cpp:307: Entities setup finished: 0.199235 seconds.
37.188 Loading script.dat: 339 bytes.
37.189 Checksum for script /home/matt/factorio/temp/currently-playing/control.lua: 4229863085
37.200 Verbose Scenario.cpp:351: Map setup finished: 0 ...

next one, I'm just going to truncate it
4209.297 Info AppManagerStates.cpp:1844: Saving finished
4255.600 Error CrashHandler.cpp:621: Received SIGSEGV
4262.114 Warning Logger.cpp:523: Symbols.size() == 11, usedSize == 6
Factorio crashed. Generating symbolized stacktrace, please wait ...
Raw ...

0.000 2020-04-26 11:08:31; Factorio 0.18.21 (build 51104, linux64, alpha)
0.051 Operating system: Linux (Debian 9.12)
0.051 Program arguments: "/home/matt/Desktop/Link to factorio"
0.051 Read data path: /home/matt/factorio/data
0.051 Write data path: /home/matt/factorio [35021/56119MB]
0.051 ...

128 hours in, first load after the latest update, though it wasn't an instant crash


matt@hex:~/factorio$ cat factorio-current.log
0.000 2020-04-25 19:14:13; Factorio 0.18.21 (build 51104, linux64, alpha)
0.032 Operating system: Linux (Debian 9.12)
0.032 Program arguments: "/home/matt/Desktop ...