Linux crashed :(

Ok thanks,.... but could also be something with swap space or hard drive errors? but i will run a memtest

in my ini file i have [EMCMOT]. SERVO_PERIOD=50000

That's very likely why it crashed, a 20Khz servo thread is simply way too fast for most PCs/hardware

a 1000000 ns (1 ms) servo period is standard and unless you have a good reason to decrease this period
it should be left alone