/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 --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.use.separate.solver.for.trace.checks true -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_4-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-267fbe0 [2020-07-17 17:18:49,744 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-17 17:18:49,747 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-17 17:18:49,768 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-17 17:18:49,769 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-17 17:18:49,771 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-17 17:18:49,775 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-17 17:18:49,787 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-17 17:18:49,791 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-17 17:18:49,794 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-17 17:18:49,796 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-17 17:18:49,798 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-17 17:18:49,798 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-17 17:18:49,800 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-17 17:18:49,802 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-17 17:18:49,804 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-17 17:18:49,805 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-17 17:18:49,806 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-17 17:18:49,808 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-17 17:18:49,813 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-17 17:18:49,819 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-17 17:18:49,821 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-17 17:18:49,824 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-17 17:18:49,825 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-17 17:18:49,828 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-17 17:18:49,835 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-17 17:18:49,836 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-17 17:18:49,837 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-17 17:18:49,838 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-07-17 17:18:49,847 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-17 17:18:49,847 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-17 17:18:49,848 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-17 17:18:49,849 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-17 17:18:49,849 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-17 17:18:49,849 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-17 17:18:49,849 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-17 17:18:49,849 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-17 17:18:49,850 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-17 17:18:49,850 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-17 17:18:49,850 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-17 17:18:49,850 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-17 17:18:49,850 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-17 17:18:49,850 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-17 17:18:49,851 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-17 17:18:49,851 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-07-17 17:18:49,851 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-17 17:18:49,851 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-17 17:18:49,851 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-17 17:18:49,852 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-17 17:18:49,852 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-07-17 17:18:49,852 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-17 17:18:49,852 INFO L138 SettingsManager]: * Use separate solver for trace checks=false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use separate solver for trace checks -> true [2020-07-17 17:18:50,135 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-17 17:18:50,149 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-17 17:18:50,153 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-17 17:18:50,154 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-17 17:18:50,155 INFO L275 PluginConnector]: CDTParser initialized [2020-07-17 17:18:50,156 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_4-2.c [2020-07-17 17:18:50,222 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3affbd565/a7592f3dae024d259686956e8eb41c18/FLAG13832d014 [2020-07-17 17:18:50,664 INFO L306 CDTParser]: Found 1 translation units. [2020-07-17 17:18:50,664 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_4-2.c [2020-07-17 17:18:50,670 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3affbd565/a7592f3dae024d259686956e8eb41c18/FLAG13832d014 [2020-07-17 17:18:51,086 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3affbd565/a7592f3dae024d259686956e8eb41c18 [2020-07-17 17:18:51,097 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-17 17:18:51,101 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-17 17:18:51,102 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-17 17:18:51,102 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-17 17:18:51,107 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-17 17:18:51,108 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.07 05:18:51" (1/1) ... [2020-07-17 17:18:51,111 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@24aa15b6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 05:18:51, skipping insertion in model container [2020-07-17 17:18:51,112 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.07 05:18:51" (1/1) ... [2020-07-17 17:18:51,120 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-17 17:18:51,138 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-17 17:18:51,363 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-17 17:18:51,371 INFO L203 MainTranslator]: Completed pre-run [2020-07-17 17:18:51,394 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-17 17:18:51,414 INFO L208 MainTranslator]: Completed translation [2020-07-17 17:18:51,414 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 05:18:51 WrapperNode [2020-07-17 17:18:51,415 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-17 17:18:51,416 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-17 17:18:51,416 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-17 17:18:51,416 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-17 17:18:51,432 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 05:18:51" (1/1) ... [2020-07-17 17:18:51,432 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 05:18:51" (1/1) ... [2020-07-17 17:18:51,555 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 05:18:51" (1/1) ... [2020-07-17 17:18:51,555 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 05:18:51" (1/1) ... [2020-07-17 17:18:51,560 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 05:18:51" (1/1) ... [2020-07-17 17:18:51,563 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 05:18:51" (1/1) ... [2020-07-17 17:18:51,568 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 05:18:51" (1/1) ... [2020-07-17 17:18:51,575 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-17 17:18:51,576 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-17 17:18:51,576 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-17 17:18:51,576 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-17 17:18:51,579 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 05:18:51" (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 [2020-07-17 17:18:51,657 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-17 17:18:51,658 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-17 17:18:51,658 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-17 17:18:51,658 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-17 17:18:51,658 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-17 17:18:51,658 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-17 17:18:51,658 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-17 17:18:51,658 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-17 17:18:51,658 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-17 17:18:51,659 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-17 17:18:51,659 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-17 17:18:51,659 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-17 17:18:51,926 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-17 17:18:51,927 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-17 17:18:51,931 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.07 05:18:51 BoogieIcfgContainer [2020-07-17 17:18:51,932 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-17 17:18:51,933 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-17 17:18:51,933 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-17 17:18:51,937 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-17 17:18:51,937 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 17.07 05:18:51" (1/3) ... [2020-07-17 17:18:51,938 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2fbb7601 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.07 05:18:51, skipping insertion in model container [2020-07-17 17:18:51,938 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 05:18:51" (2/3) ... [2020-07-17 17:18:51,939 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2fbb7601 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.07 05:18:51, skipping insertion in model container [2020-07-17 17:18:51,939 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.07 05:18:51" (3/3) ... [2020-07-17 17:18:51,941 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_4-2.c [2020-07-17 17:18:51,953 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-07-17 17:18:51,962 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-17 17:18:51,979 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-17 17:18:52,009 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-17 17:18:52,009 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-17 17:18:52,010 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-07-17 17:18:52,010 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-17 17:18:52,010 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-17 17:18:52,010 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-17 17:18:52,010 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-17 17:18:52,010 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-17 17:18:52,033 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states. [2020-07-17 17:18:52,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-17 17:18:52,049 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 17:18:52,051 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 17:18:52,051 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 17:18:52,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 17:18:52,061 INFO L82 PathProgramCache]: Analyzing trace with hash -1089710179, now seen corresponding path program 1 times [2020-07-17 17:18:52,075 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 17:18:52,076 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2138131612] [2020-07-17 17:18:52,077 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 17:18:52,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:52,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:52,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:52,352 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-17 17:18:52,353 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2138131612] [2020-07-17 17:18:52,355 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-17 17:18:52,356 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-17 17:18:52,357 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [100975722] [2020-07-17 17:18:52,364 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-17 17:18:52,364 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 17:18:52,380 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-17 17:18:52,381 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-17 17:18:52,384 INFO L87 Difference]: Start difference. First operand 45 states. Second operand 5 states. [2020-07-17 17:18:52,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 17:18:52,522 INFO L93 Difference]: Finished difference Result 58 states and 67 transitions. [2020-07-17 17:18:52,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-17 17:18:52,525 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 16 [2020-07-17 17:18:52,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 17:18:52,539 INFO L225 Difference]: With dead ends: 58 [2020-07-17 17:18:52,539 INFO L226 Difference]: Without dead ends: 42 [2020-07-17 17:18:52,544 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-17 17:18:52,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-17 17:18:52,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-07-17 17:18:52,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-07-17 17:18:52,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 49 transitions. [2020-07-17 17:18:52,609 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 49 transitions. Word has length 16 [2020-07-17 17:18:52,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 17:18:52,610 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 49 transitions. [2020-07-17 17:18:52,610 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-17 17:18:52,610 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 49 transitions. [2020-07-17 17:18:52,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-17 17:18:52,613 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 17:18:52,613 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 17:18:52,614 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-07-17 17:18:52,614 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 17:18:52,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 17:18:52,615 INFO L82 PathProgramCache]: Analyzing trace with hash -653728005, now seen corresponding path program 1 times [2020-07-17 17:18:52,615 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 17:18:52,616 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [67629391] [2020-07-17 17:18:52,616 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 17:18:52,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:52,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:52,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:52,723 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-17 17:18:52,724 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [67629391] [2020-07-17 17:18:52,724 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-17 17:18:52,725 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-17 17:18:52,725 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [661655924] [2020-07-17 17:18:52,727 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-17 17:18:52,728 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 17:18:52,728 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-17 17:18:52,728 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-17 17:18:52,729 INFO L87 Difference]: Start difference. First operand 42 states and 49 transitions. Second operand 5 states. [2020-07-17 17:18:52,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 17:18:52,807 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2020-07-17 17:18:52,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-17 17:18:52,808 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-07-17 17:18:52,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 17:18:52,810 INFO L225 Difference]: With dead ends: 50 [2020-07-17 17:18:52,810 INFO L226 Difference]: Without dead ends: 44 [2020-07-17 17:18:52,812 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-17 17:18:52,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-07-17 17:18:52,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2020-07-17 17:18:52,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-07-17 17:18:52,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 49 transitions. [2020-07-17 17:18:52,827 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 49 transitions. Word has length 17 [2020-07-17 17:18:52,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 17:18:52,828 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 49 transitions. [2020-07-17 17:18:52,828 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-17 17:18:52,828 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 49 transitions. [2020-07-17 17:18:52,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-07-17 17:18:52,831 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 17:18:52,831 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 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] [2020-07-17 17:18:52,831 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-07-17 17:18:52,832 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 17:18:52,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 17:18:52,832 INFO L82 PathProgramCache]: Analyzing trace with hash -1617834856, now seen corresponding path program 1 times [2020-07-17 17:18:52,833 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 17:18:52,833 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [168873924] [2020-07-17 17:18:52,833 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 17:18:52,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:52,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:52,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:52,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:52,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:52,975 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-17 17:18:52,975 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [168873924] [2020-07-17 17:18:52,976 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 17:18:52,976 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-07-17 17:18:52,976 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [542236400] [2020-07-17 17:18:52,977 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-17 17:18:52,977 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 17:18:52,977 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-17 17:18:52,978 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-07-17 17:18:52,978 INFO L87 Difference]: Start difference. First operand 42 states and 49 transitions. Second operand 7 states. [2020-07-17 17:18:53,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 17:18:53,112 INFO L93 Difference]: Finished difference Result 82 states and 102 transitions. [2020-07-17 17:18:53,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-17 17:18:53,114 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 33 [2020-07-17 17:18:53,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 17:18:53,119 INFO L225 Difference]: With dead ends: 82 [2020-07-17 17:18:53,119 INFO L226 Difference]: Without dead ends: 46 [2020-07-17 17:18:53,122 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-07-17 17:18:53,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-07-17 17:18:53,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 44. [2020-07-17 17:18:53,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-07-17 17:18:53,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 51 transitions. [2020-07-17 17:18:53,162 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 51 transitions. Word has length 33 [2020-07-17 17:18:53,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 17:18:53,163 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 51 transitions. [2020-07-17 17:18:53,163 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-17 17:18:53,163 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 51 transitions. [2020-07-17 17:18:53,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-07-17 17:18:53,168 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 17:18:53,168 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 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, 1, 1] [2020-07-17 17:18:53,171 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-07-17 17:18:53,171 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 17:18:53,171 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 17:18:53,172 INFO L82 PathProgramCache]: Analyzing trace with hash 887160861, now seen corresponding path program 1 times [2020-07-17 17:18:53,172 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 17:18:53,172 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1546822044] [2020-07-17 17:18:53,173 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 17:18:53,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:53,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:53,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:53,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:53,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:53,326 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-17 17:18:53,327 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1546822044] [2020-07-17 17:18:53,327 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 17:18:53,327 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-07-17 17:18:53,327 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [379130026] [2020-07-17 17:18:53,328 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-17 17:18:53,328 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 17:18:53,329 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-17 17:18:53,329 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-07-17 17:18:53,329 INFO L87 Difference]: Start difference. First operand 44 states and 51 transitions. Second operand 7 states. [2020-07-17 17:18:53,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 17:18:53,511 INFO L93 Difference]: Finished difference Result 74 states and 94 transitions. [2020-07-17 17:18:53,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-17 17:18:53,511 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 34 [2020-07-17 17:18:53,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 17:18:53,514 INFO L225 Difference]: With dead ends: 74 [2020-07-17 17:18:53,515 INFO L226 Difference]: Without dead ends: 68 [2020-07-17 17:18:53,515 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2020-07-17 17:18:53,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-07-17 17:18:53,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 66. [2020-07-17 17:18:53,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-17 17:18:53,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 83 transitions. [2020-07-17 17:18:53,533 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 83 transitions. Word has length 34 [2020-07-17 17:18:53,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 17:18:53,534 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 83 transitions. [2020-07-17 17:18:53,534 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-17 17:18:53,534 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 83 transitions. [2020-07-17 17:18:53,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-07-17 17:18:53,536 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 17:18:53,537 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 17:18:53,537 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-07-17 17:18:53,537 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 17:18:53,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 17:18:53,538 INFO L82 PathProgramCache]: Analyzing trace with hash 1875452576, now seen corresponding path program 1 times [2020-07-17 17:18:53,538 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 17:18:53,538 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2054393098] [2020-07-17 17:18:53,538 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 17:18:53,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:53,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:53,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:53,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:53,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:53,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:53,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:53,644 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-17 17:18:53,644 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2054393098] [2020-07-17 17:18:53,645 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 17:18:53,645 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-07-17 17:18:53,645 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [571929717] [2020-07-17 17:18:53,646 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-17 17:18:53,646 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 17:18:53,647 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-17 17:18:53,647 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-07-17 17:18:53,647 INFO L87 Difference]: Start difference. First operand 66 states and 83 transitions. Second operand 6 states. [2020-07-17 17:18:53,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 17:18:53,726 INFO L93 Difference]: Finished difference Result 130 states and 178 transitions. [2020-07-17 17:18:53,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-17 17:18:53,727 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 50 [2020-07-17 17:18:53,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 17:18:53,730 INFO L225 Difference]: With dead ends: 130 [2020-07-17 17:18:53,730 INFO L226 Difference]: Without dead ends: 70 [2020-07-17 17:18:53,732 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-07-17 17:18:53,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-07-17 17:18:53,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2020-07-17 17:18:53,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-17 17:18:53,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 89 transitions. [2020-07-17 17:18:53,748 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 89 transitions. Word has length 50 [2020-07-17 17:18:53,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 17:18:53,748 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 89 transitions. [2020-07-17 17:18:53,748 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-17 17:18:53,748 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 89 transitions. [2020-07-17 17:18:53,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-07-17 17:18:53,751 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 17:18:53,751 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 17:18:53,751 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-07-17 17:18:53,751 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 17:18:53,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 17:18:53,752 INFO L82 PathProgramCache]: Analyzing trace with hash 104828256, now seen corresponding path program 1 times [2020-07-17 17:18:53,752 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 17:18:53,752 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1020683444] [2020-07-17 17:18:53,753 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 17:18:53,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:53,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:53,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:53,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:53,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:53,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:53,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:53,873 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 17:18:53,874 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1020683444] [2020-07-17 17:18:53,874 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 17:18:53,874 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-07-17 17:18:53,875 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2041316971] [2020-07-17 17:18:53,875 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-17 17:18:53,875 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 17:18:53,876 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-17 17:18:53,876 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-07-17 17:18:53,876 INFO L87 Difference]: Start difference. First operand 70 states and 89 transitions. Second operand 8 states. [2020-07-17 17:18:53,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 17:18:53,982 INFO L93 Difference]: Finished difference Result 142 states and 197 transitions. [2020-07-17 17:18:53,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-17 17:18:53,982 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 51 [2020-07-17 17:18:53,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 17:18:53,985 INFO L225 Difference]: With dead ends: 142 [2020-07-17 17:18:53,985 INFO L226 Difference]: Without dead ends: 78 [2020-07-17 17:18:53,987 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-07-17 17:18:53,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-17 17:18:54,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 72. [2020-07-17 17:18:54,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-07-17 17:18:54,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 92 transitions. [2020-07-17 17:18:54,004 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 92 transitions. Word has length 51 [2020-07-17 17:18:54,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 17:18:54,004 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 92 transitions. [2020-07-17 17:18:54,005 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-17 17:18:54,005 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 92 transitions. [2020-07-17 17:18:54,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-07-17 17:18:54,007 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 17:18:54,008 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 17:18:54,008 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-07-17 17:18:54,008 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 17:18:54,009 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 17:18:54,009 INFO L82 PathProgramCache]: Analyzing trace with hash 1703786405, now seen corresponding path program 1 times [2020-07-17 17:18:54,009 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 17:18:54,009 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [947831322] [2020-07-17 17:18:54,010 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 17:18:54,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:54,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:54,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:54,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:54,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:54,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:54,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:54,187 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-17 17:18:54,188 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [947831322] [2020-07-17 17:18:54,188 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 17:18:54,188 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-07-17 17:18:54,189 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1355391262] [2020-07-17 17:18:54,189 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-17 17:18:54,190 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 17:18:54,190 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-17 17:18:54,190 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-07-17 17:18:54,191 INFO L87 Difference]: Start difference. First operand 72 states and 92 transitions. Second operand 8 states. [2020-07-17 17:18:54,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 17:18:54,373 INFO L93 Difference]: Finished difference Result 118 states and 158 transitions. [2020-07-17 17:18:54,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-17 17:18:54,373 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 52 [2020-07-17 17:18:54,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 17:18:54,376 INFO L225 Difference]: With dead ends: 118 [2020-07-17 17:18:54,376 INFO L226 Difference]: Without dead ends: 112 [2020-07-17 17:18:54,377 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2020-07-17 17:18:54,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-07-17 17:18:54,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 106. [2020-07-17 17:18:54,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2020-07-17 17:18:54,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 145 transitions. [2020-07-17 17:18:54,399 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 145 transitions. Word has length 52 [2020-07-17 17:18:54,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 17:18:54,399 INFO L479 AbstractCegarLoop]: Abstraction has 106 states and 145 transitions. [2020-07-17 17:18:54,399 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-17 17:18:54,400 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 145 transitions. [2020-07-17 17:18:54,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-07-17 17:18:54,403 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 17:18:54,403 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2020-07-17 17:18:54,403 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-07-17 17:18:54,403 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 17:18:54,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 17:18:54,404 INFO L82 PathProgramCache]: Analyzing trace with hash -521446491, now seen corresponding path program 1 times [2020-07-17 17:18:54,404 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 17:18:54,404 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [589535095] [2020-07-17 17:18:54,404 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 17:18:54,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:54,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:54,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:54,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:54,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:54,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:54,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:54,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:54,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:54,527 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 18 proven. 4 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-07-17 17:18:54,528 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [589535095] [2020-07-17 17:18:54,528 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 17:18:54,528 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-07-17 17:18:54,528 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [212513127] [2020-07-17 17:18:54,529 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-17 17:18:54,529 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 17:18:54,530 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-17 17:18:54,530 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-07-17 17:18:54,530 INFO L87 Difference]: Start difference. First operand 106 states and 145 transitions. Second operand 8 states. [2020-07-17 17:18:54,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 17:18:54,670 INFO L93 Difference]: Finished difference Result 227 states and 348 transitions. [2020-07-17 17:18:54,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-17 17:18:54,671 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 69 [2020-07-17 17:18:54,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 17:18:54,674 INFO L225 Difference]: With dead ends: 227 [2020-07-17 17:18:54,674 INFO L226 Difference]: Without dead ends: 127 [2020-07-17 17:18:54,676 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-07-17 17:18:54,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2020-07-17 17:18:54,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 115. [2020-07-17 17:18:54,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2020-07-17 17:18:54,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 161 transitions. [2020-07-17 17:18:54,700 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 161 transitions. Word has length 69 [2020-07-17 17:18:54,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 17:18:54,701 INFO L479 AbstractCegarLoop]: Abstraction has 115 states and 161 transitions. [2020-07-17 17:18:54,701 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-17 17:18:54,701 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 161 transitions. [2020-07-17 17:18:54,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-07-17 17:18:54,703 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 17:18:54,703 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2020-07-17 17:18:54,704 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-07-17 17:18:54,704 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 17:18:54,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 17:18:54,704 INFO L82 PathProgramCache]: Analyzing trace with hash -439633211, now seen corresponding path program 1 times [2020-07-17 17:18:54,705 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 17:18:54,705 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1578889351] [2020-07-17 17:18:54,705 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 17:18:54,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:54,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:54,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:54,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:54,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:54,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:54,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:54,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:54,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:54,882 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 23 proven. 11 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-17 17:18:54,882 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1578889351] [2020-07-17 17:18:54,882 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 17:18:54,883 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-07-17 17:18:54,883 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2020838228] [2020-07-17 17:18:54,883 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-17 17:18:54,884 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 17:18:54,884 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-17 17:18:54,884 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-07-17 17:18:54,885 INFO L87 Difference]: Start difference. First operand 115 states and 161 transitions. Second operand 10 states. [2020-07-17 17:18:55,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 17:18:55,106 INFO L93 Difference]: Finished difference Result 257 states and 400 transitions. [2020-07-17 17:18:55,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-17 17:18:55,107 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 70 [2020-07-17 17:18:55,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 17:18:55,110 INFO L225 Difference]: With dead ends: 257 [2020-07-17 17:18:55,110 INFO L226 Difference]: Without dead ends: 151 [2020-07-17 17:18:55,112 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-17 17:18:55,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2020-07-17 17:18:55,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 133. [2020-07-17 17:18:55,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2020-07-17 17:18:55,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 191 transitions. [2020-07-17 17:18:55,134 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 191 transitions. Word has length 70 [2020-07-17 17:18:55,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 17:18:55,134 INFO L479 AbstractCegarLoop]: Abstraction has 133 states and 191 transitions. [2020-07-17 17:18:55,134 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-17 17:18:55,135 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 191 transitions. [2020-07-17 17:18:55,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2020-07-17 17:18:55,137 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 17:18:55,137 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 17:18:55,137 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-07-17 17:18:55,138 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 17:18:55,138 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 17:18:55,138 INFO L82 PathProgramCache]: Analyzing trace with hash 307755032, now seen corresponding path program 2 times [2020-07-17 17:18:55,138 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 17:18:55,139 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [342811299] [2020-07-17 17:18:55,139 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 17:18:55,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:55,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:55,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:55,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:55,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:55,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:55,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:55,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:55,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:55,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:55,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:55,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:55,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:18:55,378 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 36 proven. 59 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2020-07-17 17:18:55,378 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [342811299] [2020-07-17 17:18:55,378 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 17:18:55,379 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-07-17 17:18:55,379 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1694364425] [2020-07-17 17:18:55,380 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-17 17:18:55,380 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 17:18:55,381 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-17 17:18:55,381 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=109, Unknown=0, NotChecked=0, Total=132 [2020-07-17 17:18:55,381 INFO L87 Difference]: Start difference. First operand 133 states and 191 transitions. Second operand 12 states. [2020-07-17 17:18:55,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 17:18:55,814 INFO L93 Difference]: Finished difference Result 265 states and 420 transitions. [2020-07-17 17:18:55,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-17 17:18:55,815 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 105 [2020-07-17 17:18:55,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 17:18:55,818 INFO L225 Difference]: With dead ends: 265 [2020-07-17 17:18:55,819 INFO L226 Difference]: Without dead ends: 116 [2020-07-17 17:18:55,821 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-17 17:18:55,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2020-07-17 17:18:55,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 103. [2020-07-17 17:18:55,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-07-17 17:18:55,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 127 transitions. [2020-07-17 17:18:55,838 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 127 transitions. Word has length 105 [2020-07-17 17:18:55,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 17:18:55,838 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 127 transitions. [2020-07-17 17:18:55,838 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-17 17:18:55,838 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 127 transitions. [2020-07-17 17:18:55,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-07-17 17:18:55,840 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 17:18:55,840 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 17:18:55,840 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-07-17 17:18:55,841 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 17:18:55,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 17:18:55,841 INFO L82 PathProgramCache]: Analyzing trace with hash 1951493560, now seen corresponding path program 1 times [2020-07-17 17:18:55,841 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 17:18:55,841 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2114976625] [2020-07-17 17:18:55,842 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 17:18:55,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-17 17:18:55,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-17 17:18:55,887 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-17 17:18:55,888 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-17 17:18:55,888 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-07-17 17:18:55,931 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 17.07 05:18:55 BoogieIcfgContainer [2020-07-17 17:18:55,931 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-17 17:18:55,934 INFO L168 Benchmark]: Toolchain (without parser) took 4834.19 ms. Allocated memory was 138.9 MB in the beginning and 278.4 MB in the end (delta: 139.5 MB). Free memory was 104.1 MB in the beginning and 177.3 MB in the end (delta: -73.3 MB). Peak memory consumption was 66.2 MB. Max. memory is 7.1 GB. [2020-07-17 17:18:55,935 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 138.9 MB. Free memory was 122.4 MB in the beginning and 122.2 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-17 17:18:55,936 INFO L168 Benchmark]: CACSL2BoogieTranslator took 313.18 ms. Allocated memory is still 138.9 MB. Free memory was 103.6 MB in the beginning and 94.1 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. [2020-07-17 17:18:55,937 INFO L168 Benchmark]: Boogie Preprocessor took 160.05 ms. Allocated memory was 138.9 MB in the beginning and 205.0 MB in the end (delta: 66.1 MB). Free memory was 94.1 MB in the beginning and 183.6 MB in the end (delta: -89.5 MB). Peak memory consumption was 14.7 MB. Max. memory is 7.1 GB. [2020-07-17 17:18:55,938 INFO L168 Benchmark]: RCFGBuilder took 355.79 ms. Allocated memory is still 205.0 MB. Free memory was 183.6 MB in the beginning and 169.4 MB in the end (delta: 14.2 MB). Peak memory consumption was 14.2 MB. Max. memory is 7.1 GB. [2020-07-17 17:18:55,939 INFO L168 Benchmark]: TraceAbstraction took 3998.13 ms. Allocated memory was 205.0 MB in the beginning and 278.4 MB in the end (delta: 73.4 MB). Free memory was 169.4 MB in the beginning and 177.3 MB in the end (delta: -7.9 MB). Peak memory consumption was 65.5 MB. Max. memory is 7.1 GB. [2020-07-17 17:18:55,943 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 138.9 MB. Free memory was 122.4 MB in the beginning and 122.2 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 313.18 ms. Allocated memory is still 138.9 MB. Free memory was 103.6 MB in the beginning and 94.1 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 160.05 ms. Allocated memory was 138.9 MB in the beginning and 205.0 MB in the end (delta: 66.1 MB). Free memory was 94.1 MB in the beginning and 183.6 MB in the end (delta: -89.5 MB). Peak memory consumption was 14.7 MB. Max. memory is 7.1 GB. * RCFGBuilder took 355.79 ms. Allocated memory is still 205.0 MB. Free memory was 183.6 MB in the beginning and 169.4 MB in the end (delta: 14.2 MB). Peak memory consumption was 14.2 MB. Max. memory is 7.1 GB. * TraceAbstraction took 3998.13 ms. Allocated memory was 205.0 MB in the beginning and 278.4 MB in the end (delta: 73.4 MB). Free memory was 169.4 MB in the beginning and 177.3 MB in the end (delta: -7.9 MB). Peak memory consumption was 65.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 39]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L36] int x = 4; VAL [x=4] [L37] CALL, EXPR fibo1(x) VAL [\old(n)=4] [L8] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L10] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=3] [L18] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L20] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 VAL [\old(n)=1, n=1] [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 VAL [\old(n)=0, n=0] [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); VAL [\old(n)=2, \result=1, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=3, fibo1(n-1)=1, n=3] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 VAL [\old(n)=1, n=1] [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=3, fibo1(n-1)=1, fibo1(n-2)=1, n=3] [L23] return fibo1(n-1) + fibo1(n-2); VAL [\old(n)=3, \result=2, fibo1(n-1)=1, fibo1(n-2)=1, n=3] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=4, fibo2(n-1)=2, n=4] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 VAL [\old(n)=1, n=1] [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 VAL [\old(n)=0, n=0] [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); VAL [\old(n)=2, \result=1, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=4, fibo2(n-1)=2, fibo2(n-2)=1, n=4] [L13] return fibo2(n-1) + fibo2(n-2); VAL [\old(n)=4, \result=3, fibo2(n-1)=2, fibo2(n-2)=1, n=4] [L37] RET, EXPR fibo1(x) VAL [fibo1(x)=3, x=4] [L37] int result = fibo1(x); VAL [fibo1(x)=3, result=3, x=4] [L38] COND TRUE result == 3 VAL [result=3, x=4] [L39] __VERIFIER_error() VAL [result=3, x=4] - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 45 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 3.8s, OverallIterations: 11, TraceHistogramMax: 6, AutomataDifference: 1.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 436 SDtfs, 418 SDslu, 1642 SDs, 0 SdLazy, 1042 SolverSat, 117 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.8s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 228 GetRequests, 146 SyntacticMatches, 0 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 0.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=133occurred in iteration=9, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 10 MinimizatonAttempts, 61 StatesRemovedByMinimization, 8 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.2s InterpolantComputationTime, 584 NumberOfCodeBlocks, 584 NumberOfCodeBlocksAsserted, 11 NumberOfCheckSat, 487 ConstructedInterpolants, 0 QuantifiedInterpolants, 56021 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 10 InterpolantComputations, 2 PerfectInterpolantSequences, 207/306 InterpolantCoveringCapability, 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...