July 20, The day software bugs nearly lost us the moon. July 20, 2004
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1 July 20, 1969 The day software bugs nearly lost us the moon July 20,
2 This day, 35 years ago 35 years today 2
3 (of course, it never happened ) Flag waving in vacuum English writing on rocks 3
4 Guidance office (GUIDO) Steve Bales and assistant Jack Garman scrambled to solve the problem. Garman recalls a similar incident in simulation only a week or so before. Tells Bales It s executive overflow; if it does not occur again, we re fine. 28 secs Bales wants more time to assess There is none. Flight director Kranz glares at Bales, slamming his fist into the console. Bales made his first call: "Go (loudly and emphatically!) 3 secs Bales makes his second call: go. Thereby winning the Presidential Medal of Freedom And, of course, it very nearly didn t Computer alarms on descent; threat to landing abort Manual takeover at 1300 ft (90 secs of fuel) 4 miles downrange, bolder field Heart pounding (156 beats per minute) Armstrong landed with only seconds of fuel to spare. 102:38:26 Armstrong: Program Alarm. (6k ft agl) 102:38:30 Armstrong: It's a :38:32 Aldrin: :38:42 Armstrong (To Buzz) What is it? Let's incorporate (the landing radar data). (To Houston) Give us a reading on the 1202 Program Alarm. 102:38:53 Duke: Roger. We got you...(with urgency) We're Go on that alarm. 102:39:14 Aldrin: Same alarm.. appears to come up when we have a 16/68 up :42:08 Duke: Roger. Copy.. Eagle, Houston. You're Go for landing. Over.. 102:42:17 Aldrin: Roger. Understand. Go for landing... Program Alarm.. 102:42:22 Aldrin: 1201 (3k ft) 102:42:24 Armstrong: 1201! 102:42:25 Duke: Roger alarm. (Pause) We're Go. Same type. We're Go :45:58 Armstrong Houston, Tranquility Base here. The Eagle has landed. 4
5 Flight director Kranz on Steve Bales: (Steve Bales is) one of the original computer nerds. I mean, he looks like one. He's got these big owlish-type plasticrimmed glasses you got in there. I don't think any of them-they all look like they never needed to shave. I mean, they're baby-faced kind of people 5
6 From Gene Kranz: Failure is Not an Option Final simulation done prior to the launch, Dave Scott and Jim Irwin in the LM simulator. landing simulation was aborted - unnecessarily because of a 1201 program alarm Kranz sent Bales off to work up rules for each type of alarm. Later that evening, Bales rings Kranz saying We should not have aborted (due to that guidance system error) 6
7 Inside the Apollo Computers Standard 2004 PC: 1GB ram LEM/CM computer s had two types of memory: fixed memory programs, constants and landmarks 36,864*15 bit words= 74KB (!!) erasable memory, variables/ registers used in calculations 2, bit terms. coincident-current ferrite cores woven into a rope with copper wires and sealed in plastic. Real-time multi-tasking operating system. Always processes the job with the highest priority before other, lower priority jobs Two Apollo control programs : Waitlist handled <= 9 quick tasks (4ms or less) Executive handled longer tasks (up to 7 tasks) Each tasks had erasable memory Memory was shared (up to seven ways!) 1202 error: indicating a CPU overload, On descent: searching for rendezvous radar data Not fatal Computer had been programmed to recognize this task as being of secondary importance Ignored it, performed other tasks instead 7
8 What were the 1202/1201 alarms? M.I.T. Instrumentation Laboratory ("the Lab") Built the Apollo Guidance and Navigation System; 10 seconds after the eagle has landed, NASA rang the lab "What were those alarms? We're launching in 24 hours and we're not going with alarms. We must have an operational computer! 8
9 Massive Debugging at M.I.T. The bug: cycle stealing Overload of queue computer not getting to certain computations, What was slowing things up? I/O system keeps looking for data. The Rendezvous Radar Switch was in the AUTO position and the computer was doing I/O looking for radar data. Error in the crew procedures Place rendezvous radar switch to AUTO during descent WRONG! Why not seen found during simulation? The switch was not connected to a real computer (procedures validation performed on functional simulation) Last message before lunar take-off Glenn Lunney,(Flight Controller), calmly told the astronauts Please put the Rendezvous Radar Switch in the Manual position". 9
10 Lessons for SQA Bad software can kill good hardware (c.f. Ariane V) Manuals matter (c.f. Soho) Test what you fly (and nothing else) Do your criticality analysis right For descent, rendezvous radar was apparently not-critical Rendezvous radar used post ascent, not descent Also, even if it failed on ascent, then just launch to lunar orbit and let CM s systems do the docking. 10
11 One footprint is lonely 11
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