{"UUID":"e21166ff-b35a-4309-99cd-4a8bf5e22305","URL":"https://web.archive.org/web/20161230103247/http://research.microsoft.com/en-us/um/people/mbj/Mars_Pathfinder/Authoritative_Account.html","StartTime":"0001-01-01T00:00:00Z","EndTime":"0001-01-01T00:00:00Z","Categories":["postmortem"],"Company":"NASA","Product":"","Description":"NASA's Mars Pathfinder spacecraft experienced system resets a few days after landing on Mars (1997).  Debugging features were remotely enabled until the cause was found: a [priority inversion](https://en.wikipedia.org/wiki/Priority_inversion) problem in the VxWorks operating system.  The OS software was remotely patched (all the way to Mars) to fix the problem by adding priority inheritance to the task scheduler."}