/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/loops/nec20.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-72570d3 [2020-08-22 19:45:29,258 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 19:45:29,261 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 19:45:29,285 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-08-22 19:45:29,304 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 19:45:29,307 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 19:45:29,308 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 19:45:29,310 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 19:45:29,310 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 19:45:29,312 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 19:45:29,318 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 19:45:29,322 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 19:45:29,325 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 19:45:29,328 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 19:45:29,329 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 19:45:29,331 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 19:45:29,339 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-22 19:45:29,354 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 19:45:29,365 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 19:45:29,369 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 19:45:29,370 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-08-22 19:45:29,392 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 19:45:29,393 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 19:45:29,396 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 19:45:29,397 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 19:45:29,398 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 19:45:29,398 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 19:45:29,398 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 19:45:29,398 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 19:45:29,398 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 19:45:29,399 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 19:45:29,399 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 19:45:29,399 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 19:45:29,399 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 19:45:29,399 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 19:45:29,400 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 19:45:29,401 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-08-22 19:45:29,401 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 19:45:29,401 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 19:45:29,402 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 19:45:29,402 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 19:45:29,402 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-08-22 19:45:29,402 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 19:45:29,402 INFO L138 SettingsManager]: * Use separate solver for trace checks=false [2020-08-22 19:45:29,678 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 19:45:29,691 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 19:45:29,694 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 19:45:29,696 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 19:45:29,697 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 19:45:29,697 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/nec20.c [2020-08-22 19:45:29,779 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c071cc421/dc79bf99a0f54bc0991d5f5e939e23a9/FLAG990bafda4 [2020-08-22 19:45:30,224 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 19:45:30,225 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/nec20.c [2020-08-22 19:45:30,231 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c071cc421/dc79bf99a0f54bc0991d5f5e939e23a9/FLAG990bafda4 [2020-08-22 19:45:30,596 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c071cc421/dc79bf99a0f54bc0991d5f5e939e23a9 [2020-08-22 19:45:30,604 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 19:45:30,606 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 19:45:30,608 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 19:45:30,608 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 19:45:30,611 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 19:45:30,613 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 07:45:30" (1/1) ... [2020-08-22 19:45:30,617 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@283e1fb4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:45:30, skipping insertion in model container [2020-08-22 19:45:30,617 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 07:45:30" (1/1) ... [2020-08-22 19:45:30,626 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 19:45:30,645 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 19:45:30,849 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 19:45:30,855 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 19:45:30,879 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 19:45:30,899 INFO L208 MainTranslator]: Completed translation [2020-08-22 19:45:30,900 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:45:30 WrapperNode [2020-08-22 19:45:30,900 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 19:45:30,901 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 19:45:30,901 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 19:45:30,901 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 19:45:30,920 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:45:30" (1/1) ... [2020-08-22 19:45:30,920 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:45:30" (1/1) ... [2020-08-22 19:45:30,929 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:45:30" (1/1) ... [2020-08-22 19:45:30,929 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:45:30" (1/1) ... [2020-08-22 19:45:31,018 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:45:30" (1/1) ... [2020-08-22 19:45:31,029 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:45:30" (1/1) ... [2020-08-22 19:45:31,031 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:45:30" (1/1) ... [2020-08-22 19:45:31,038 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 19:45:31,041 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 19:45:31,041 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 19:45:31,041 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 19:45:31,044 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:45:30" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 19:45:31,122 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 19:45:31,123 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 19:45:31,123 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-22 19:45:31,123 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 19:45:31,123 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 19:45:31,124 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-08-22 19:45:31,124 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-22 19:45:31,124 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-08-22 19:45:31,124 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 19:45:31,124 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 19:45:31,124 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 19:45:31,415 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 19:45:31,415 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-22 19:45:31,420 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 07:45:31 BoogieIcfgContainer [2020-08-22 19:45:31,420 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 19:45:31,421 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 19:45:31,422 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 19:45:31,425 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 19:45:31,425 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 07:45:30" (1/3) ... [2020-08-22 19:45:31,426 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@516c5791 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 07:45:31, skipping insertion in model container [2020-08-22 19:45:31,426 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:45:30" (2/3) ... [2020-08-22 19:45:31,427 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@516c5791 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 07:45:31, skipping insertion in model container [2020-08-22 19:45:31,427 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 07:45:31" (3/3) ... [2020-08-22 19:45:31,429 INFO L109 eAbstractionObserver]: Analyzing ICFG nec20.c [2020-08-22 19:45:31,440 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-22 19:45:31,448 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 19:45:31,462 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 19:45:31,484 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 19:45:31,484 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 19:45:31,484 INFO L377 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2020-08-22 19:45:31,484 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 19:45:31,484 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 19:45:31,484 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 19:45:31,485 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 19:45:31,485 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 19:45:31,499 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states. [2020-08-22 19:45:31,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-22 19:45:31,510 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 19:45:31,511 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 19:45:31,511 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 19:45:31,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 19:45:31,518 INFO L82 PathProgramCache]: Analyzing trace with hash -1806400052, now seen corresponding path program 1 times [2020-08-22 19:45:31,527 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 19:45:31,528 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [650445836] [2020-08-22 19:45:31,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 19:45:31,598 INFO L288 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-08-22 19:45:31,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 19:45:31,912 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 20 [2020-08-22 19:45:31,925 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 19:45:31,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 19:45:31,941 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 19:45:31,944 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [650445836] [2020-08-22 19:45:31,946 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 19:45:31,947 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-22 19:45:31,947 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2111825740] [2020-08-22 19:45:31,952 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 19:45:31,953 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 19:45:31,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 19:45:31,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-22 19:45:31,968 INFO L87 Difference]: Start difference. First operand 42 states. Second operand 5 states. [2020-08-22 19:45:32,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 19:45:32,445 INFO L93 Difference]: Finished difference Result 85 states and 100 transitions. [2020-08-22 19:45:32,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 19:45:32,447 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 23 [2020-08-22 19:45:32,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 19:45:32,458 INFO L225 Difference]: With dead ends: 85 [2020-08-22 19:45:32,459 INFO L226 Difference]: Without dead ends: 43 [2020-08-22 19:45:32,463 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-22 19:45:32,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-22 19:45:32,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 34. [2020-08-22 19:45:32,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-22 19:45:32,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2020-08-22 19:45:32,514 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 23 [2020-08-22 19:45:32,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 19:45:32,514 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2020-08-22 19:45:32,515 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 19:45:32,515 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2020-08-22 19:45:32,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-22 19:45:32,516 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 19:45:32,516 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 19:45:32,517 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 19:45:32,517 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 19:45:32,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 19:45:32,518 INFO L82 PathProgramCache]: Analyzing trace with hash -1097761428, now seen corresponding path program 1 times [2020-08-22 19:45:32,518 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 19:45:32,519 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [323324599] [2020-08-22 19:45:32,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 19:45:32,521 INFO L288 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-08-22 19:45:32,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 19:45:32,661 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 19:45:32,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 19:45:32,677 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 19:45:32,678 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [323324599] [2020-08-22 19:45:32,678 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 19:45:32,678 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-22 19:45:32,679 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1980915991] [2020-08-22 19:45:32,680 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 19:45:32,680 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 19:45:32,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 19:45:32,685 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-22 19:45:32,685 INFO L87 Difference]: Start difference. First operand 34 states and 35 transitions. Second operand 5 states. [2020-08-22 19:45:32,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 19:45:32,852 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2020-08-22 19:45:32,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 19:45:32,853 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 23 [2020-08-22 19:45:32,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 19:45:32,854 INFO L225 Difference]: With dead ends: 50 [2020-08-22 19:45:32,855 INFO L226 Difference]: Without dead ends: 44 [2020-08-22 19:45:32,856 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-22 19:45:32,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-22 19:45:32,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 30. [2020-08-22 19:45:32,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-22 19:45:32,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2020-08-22 19:45:32,868 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 23 [2020-08-22 19:45:32,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 19:45:32,868 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2020-08-22 19:45:32,868 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 19:45:32,869 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2020-08-22 19:45:32,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-22 19:45:32,870 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 19:45:32,870 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 19:45:32,870 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-22 19:45:32,870 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 19:45:32,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 19:45:32,871 INFO L82 PathProgramCache]: Analyzing trace with hash 1269377587, now seen corresponding path program 1 times [2020-08-22 19:45:32,871 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 19:45:32,872 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1080553158] [2020-08-22 19:45:32,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 19:45:32,900 INFO L288 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-08-22 19:45:32,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 19:45:33,140 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 19:45:33,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 19:45:33,153 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 19:45:33,154 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1080553158] [2020-08-22 19:45:33,155 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 19:45:33,155 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-08-22 19:45:33,155 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1505666682] [2020-08-22 19:45:33,156 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-22 19:45:33,156 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 19:45:33,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-22 19:45:33,158 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-08-22 19:45:33,158 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 8 states. [2020-08-22 19:45:33,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 19:45:33,620 INFO L93 Difference]: Finished difference Result 55 states and 57 transitions. [2020-08-22 19:45:33,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-22 19:45:33,624 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 28 [2020-08-22 19:45:33,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 19:45:33,628 INFO L225 Difference]: With dead ends: 55 [2020-08-22 19:45:33,629 INFO L226 Difference]: Without dead ends: 49 [2020-08-22 19:45:33,630 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=53, Invalid=103, Unknown=0, NotChecked=0, Total=156 [2020-08-22 19:45:33,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-22 19:45:33,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 39. [2020-08-22 19:45:33,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-22 19:45:33,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-08-22 19:45:33,656 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 28 [2020-08-22 19:45:33,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 19:45:33,657 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-08-22 19:45:33,657 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-22 19:45:33,657 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-08-22 19:45:33,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-22 19:45:33,660 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 19:45:33,660 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 19:45:33,660 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-22 19:45:33,661 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 19:45:33,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 19:45:33,661 INFO L82 PathProgramCache]: Analyzing trace with hash -1258948973, now seen corresponding path program 1 times [2020-08-22 19:45:33,661 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 19:45:33,662 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [884322719] [2020-08-22 19:45:33,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 19:45:33,668 INFO L288 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-08-22 19:45:33,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 19:45:33,706 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-08-22 19:45:33,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 19:45:33,720 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-08-22 19:45:33,744 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-22 19:45:33,745 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-22 19:45:33,745 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-22 19:45:33,763 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.08 07:45:33 BoogieIcfgContainer [2020-08-22 19:45:33,763 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-22 19:45:33,765 INFO L168 Benchmark]: Toolchain (without parser) took 3159.24 ms. Allocated memory was 139.5 MB in the beginning and 235.4 MB in the end (delta: 95.9 MB). Free memory was 102.8 MB in the beginning and 131.9 MB in the end (delta: -29.1 MB). Peak memory consumption was 66.8 MB. Max. memory is 7.1 GB. [2020-08-22 19:45:33,766 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 139.5 MB. Free memory was 120.7 MB in the beginning and 120.5 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-08-22 19:45:33,767 INFO L168 Benchmark]: CACSL2BoogieTranslator took 292.65 ms. Allocated memory is still 139.5 MB. Free memory was 102.6 MB in the beginning and 92.7 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. [2020-08-22 19:45:33,768 INFO L168 Benchmark]: Boogie Preprocessor took 137.52 ms. Allocated memory was 139.5 MB in the beginning and 203.4 MB in the end (delta: 64.0 MB). Free memory was 92.7 MB in the beginning and 182.1 MB in the end (delta: -89.4 MB). Peak memory consumption was 14.3 MB. Max. memory is 7.1 GB. [2020-08-22 19:45:33,769 INFO L168 Benchmark]: RCFGBuilder took 379.45 ms. Allocated memory is still 203.4 MB. Free memory was 182.1 MB in the beginning and 167.5 MB in the end (delta: 14.6 MB). Peak memory consumption was 14.6 MB. Max. memory is 7.1 GB. [2020-08-22 19:45:33,771 INFO L168 Benchmark]: TraceAbstraction took 2341.90 ms. Allocated memory was 203.4 MB in the beginning and 235.4 MB in the end (delta: 32.0 MB). Free memory was 167.5 MB in the beginning and 131.9 MB in the end (delta: 35.6 MB). Peak memory consumption was 67.5 MB. Max. memory is 7.1 GB. [2020-08-22 19:45:33,775 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 139.5 MB. Free memory was 120.7 MB in the beginning and 120.5 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 292.65 ms. Allocated memory is still 139.5 MB. Free memory was 102.6 MB in the beginning and 92.7 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 137.52 ms. Allocated memory was 139.5 MB in the beginning and 203.4 MB in the end (delta: 64.0 MB). Free memory was 92.7 MB in the beginning and 182.1 MB in the end (delta: -89.4 MB). Peak memory consumption was 14.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 379.45 ms. Allocated memory is still 203.4 MB. Free memory was 182.1 MB in the beginning and 167.5 MB in the end (delta: 14.6 MB). Peak memory consumption was 14.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2341.90 ms. Allocated memory was 203.4 MB in the beginning and 235.4 MB in the end (delta: 32.0 MB). Free memory was 167.5 MB in the beginning and 131.9 MB in the end (delta: 35.6 MB). Peak memory consumption was 67.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 6]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L10] int b; [L13] _Bool k=__VERIFIER_nondet_bool(); [L14] unsigned int i,n,j; [L15] int a[1025]; [L17] COND TRUE \read(k) [L18] n=0 [L23] i=0 [L24] j=__VERIFIER_nondet_uint() [L25] COND FALSE !(j > 10000) [L28] COND TRUE i <= n [L29] i++ [L30] j= j +2 [L28] COND FALSE !(i <= n) [L33] a[i]=0 [L34] CALL __VERIFIER_assert(j<1025) [L5] COND TRUE !(cond) [L6] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 42 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 2.2s, OverallIterations: 4, TraceHistogramMax: 1, AutomataDifference: 1.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 109 SDtfs, 177 SDslu, 74 SDs, 0 SdLazy, 304 SolverSat, 12 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.5s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 30 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=42occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 3 MinimizatonAttempts, 33 StatesRemovedByMinimization, 3 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: No data available, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...