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Errors funny fatal PowerPoint Presentation

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Errors funny fatal Presentation Transcript

Slide 1 - Software Errors: Funny and Fatal Aditya P. Mathur Sci 110 Honors Seminar Monday Oct 18, 2004 Last update: October 18, 2004
Slide 2 - October 17, 2004 Errors 2 Errors and humans “To err is human; to forgive, divine.” “ …but to really foul up requires a computer..” “From novice to the best, from the inexperienced to the experienced, from young to old, all designers/programmers make errors.”
Slide 3 - October 17, 2004 Errors 3 Error: A definition “mistake, error, fault” “ a wrong action attributable to bad judgment or ignorance or inattention; "he made a bad mistake"; "she was quick to point out my errors"; "I could understand his English in spite of his grammatical faults"
Slide 4 - October 17, 2004 Errors 4 Error, fault, failure Analyst/Designer/Programmer makes a mistake. Fault appears in the program. Fault remains undetected during testing. The program fails during execution i.e. it behaves unexpectedly.
Slide 5 - October 17, 2004 Errors 5 Errors and Input Set of inputs, also known as the Input domain Error revealing domain
Slide 6 - October 17, 2004 Errors 6 Finding and fixing errors Goal of testing and debugging: Reduce the set of failure causing inputs to null.
Slide 7 - October 17, 2004 Errors 7 Impact of Errors Funny: Will likely generate laughter. Fatal: May cause death. Inconvenience: May require machine reboot. Disaster: May cause loss of property.
Slide 8 - October 17, 2004 Errors 8 Funny: La Tosca (Giacomo Puccini) “The opera Tosca debuted just over one hundred years ago, at the Teatro Constanzi in Rome on January 14, 1900. Soon after its premiere, it became one of the most popular operas in the repertoire, and it remains so to this day.”
Slide 9 - October 17, 2004 Errors 9 Funny: Candle Blowing “It was the candelabra that played a prominent role in a San Diego performance of Tosca in 1956. The script called for Tosca to blow out the four candles in the candelabra before dramatically placing a candle on either side of Scarpia and a crucifix on his breast and exiting the stage. With modern fireproofing the fire-risk is usually considered small enough to permit the use of real candles.”
Slide 10 - October 17, 2004 Errors 10 Funny: Blow order mismatch “In San Diego, however, the candles were not only electric, but the order of their going out was fixed on a computer tape along with all the rest of the lighting cues. The tape obeyed the stage manager's signal and snuffed the candles exactly as Tosca blew them out - except that on this occasion the programming was wrong and it blew them out in a different order from hers.”
Slide 11 - October 17, 2004 Errors 11 Funny: Oops! She blew to the right, the candle on the left went out, she blew the back one, the one in front went out! To further confuse the situation, as she began E avanti a lui tremava tutta Roma (And before him all Rome trembled), the electronic bleep for the curtain arrived too soon and the curtain shut with furious speed before she had finished.
Slide 12 - October 17, 2004 Errors 12 Disaster: Rocket Launch French rocket Ariane 501 was scheduled to launch on the morning of June 4, 1996, from the launch site in Kourou, French Guiana. Failure of the launch due to the un-manned rocket exploding after 42 seconds from the time of the launch.
Slide 13 - October 17, 2004 Errors 13 Disaster: The error An internal software exception was caused during execution of a data conversion from a 64-bit floating-point number to a 16-bit signed integer value. The value of the floating-point number was greater than what could be represented by a 16-bit signed integer (e.g. 43,445). The data conversion instructions were not protected from causing operand errors.
Slide 14 - October 17, 2004 Errors 14 Disaster: Inadequate testing “The guidance system for Ariane 5 was an upgrade from Ariane 4. But Ariane 5 had a different trajectory which pushed one of the numerical parameters out of bounds.” “ This would have been caught in testing, but only if the testing specification were properly upgraded to work for Araine 5. That didn't happen although the specifications and development processes are at the same level as NASA uses. They still failed.”
Slide 15 - October 17, 2004 Errors 15 Fatal: Therac-25 “The Therac-25 was a computerized radiation therapy machine.” “The Therac-20, a predecessor of the Therac-25, employed independent protective circuits and mechanical interlocks to protect against overdose. The Therac-25 relied more heavily on software.”
Slide 16 - October 17, 2004 Errors 16 Fatal: No hardware interlocks “The Therac-25 supported a multitasking environment, and the software allowed concurrent access to shared data. This precarious implementation caused program failure under certain (race) conditions.”
Slide 17 - October 17, 2004 Errors 17 Fatal: Overdose and Deaths “The machine massively overdosed patients at least six times between June 1985 and January 1987. Each overdose was several times the normal therapeutic dose and resulted in the patient's severe injury or even death.”
Slide 18 - October 17, 2004 Errors 18 Inconveniences: Minor and Major Paychecks printed with $0! On July 1-2, 1991, computer-software collapses in telephone switching stations disrupted service in Washington DC, Pittsburgh, Los Angeles and San Francisco. The Mars Climate Orbiter crashed in September 1999 because of a "silly mistake": wrong units in a program. A cat was registered as a voter to demonstrate risks (no pawtograph required).
Slide 19 - October 17, 2004 Errors 19 Thank You! http://www.cs.tau.ac.il/~nachumd/horror.html http://www.five-ten-sg.com/risks/21.html Nany Leveson (Safety expert): http://onlineethics.org/cases/therac25.html http://sunnyday.mit.edu/book.html The following sites point to many “horror stories” related to software errors. References
 

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