BarrSlides_FINAL_SCRUBBED.pdf?utm_content=bufferb9206&utm_medium=social&utm_source=twitter

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THE TEST SPACE IS EFFECTIVELY INFINITEThere are >16 million combinations of task death! Memory corruption can kill 1, 2, or all 24Each task can die in thousands of different states! Vehicle operational states (e.g., cruise on/off; accel 5% vs. 50%)52And what happens next; driver reactions to misbehaviors; etc.! Internal software statesTest “samples” so far confirm! Claimed fail-safes inadequate!OPERATIONALSCENARIOSFAILURETYPESTOO MANYPOSSIBLETESTSTIMING AND SEQUENCINGBarr Chapter RegardingTask Death and UA
UA FOREVER IF BRAKE ON AT TASK DEATHVehiclespeed is~ 45 mphGas pedaldoes notaffectspeed anymore!Brake on(evenlightly) atstart oftaskdeathNone of the“fail-safes” act> 30 secondsFail-safeacts onlyafterdriverremovesfoot(fully)frombrake53Source: Loudon St. John Report
Page 3 and 4: BOOKS BY MICHAEL BARR1ed: 1999; 2ed
Page 5 and 6: MY REVIEW OF TOYOTA’S SOURCE CODE
Page 7 and 8: ELECTRONIC THROTTLE CONTROLfdadg7
Page 9 and 10: SAFETY-CRITICAL SYSTEMSNot all embe
Page 11 and 12: SUMMARY OF 2005 CAMRY L4 CONCLUSION
Page 13 and 14: NASA DID NOT RULE OUT UA BY SOFTWAR
Page 15 and 16: 15ETCS SOFTWARE MALFUNCTION
Page 17 and 18: TOYOTA’S OPERATING SYSTEM (OSEK)1
Page 19 and 20: MEMORY CORRUPTION AND TASK DEATH0Bi
Page 21 and 22: SOFTWARE CAUSES OF MEMORY CORRUPTIO
Page 23 and 24: TOYOTA’S SPAGHETTI CODETOY-MDL049
Page 25 and 26: STACK ANALYSIS FOR 2005 CAMRY L4OSE
Page 27 and 28: TOYOTA’S MAJOR STACK MISTAKESToyo
Page 29 and 30: TOYOTA FAILED TO COMPLY WITH STANDA
Page 31 and 32: TOYOTA FAILED TO COMPLY WITH STANDA
Page 33 and 34: NASA’S SOFTWARE AREAS OF CONCERNN
Page 35 and 36: LAYER 1: MIRRORING OF CRITICAL VARI
Page 37 and 38: UA VIA MEMORY CORRUPTIONTask X deat
Page 39 and 40: LAYER 2: DTCs AND FAIL-SAFE MODESNA
Page 41 and 42: TOYOTA’S DEFECTIVE WATCHDOG DESIG
Page 43 and 44: TOYOTA FAILED TO REVIEW MONITOR CPU
Page 45 and 46: MONITOR CPU IS LAST LINE OF UA DEFE
Page 47 and 48: TOYOTA’S INADEQUATE SOFTWARE PROC
Page 49 and 50: NASA SOUGHT WHAT BARR GROUP FOUND
Page 51: INDIVIDUAL TASK DEATH OUTCOMES(Watc
Page 55 and 56: OTHER SIMILAR INCIDENT CRITERIAVehi
Page 57: TOYOTA’S EXPERT HAS NOT REBUTTEDM

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