/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.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 --traceabstraction.trace.refinement.strategy CAMEL_SMT_AM -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/ldv-regression/test24-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-79ed534 [2020-07-20 01:28:58,749 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-07-20 01:28:58,780 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 01:28:58,781 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 01:28:58,782 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 01:28:58,784 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 01:28:58,784 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 01:28:58,785 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 01:28:58,787 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 01:28:58,789 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 01:28:58,790 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 01:28:58,791 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 01:28:58,792 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 01:28:58,793 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 01:28:58,796 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 01:28:58,803 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 01:28:58,804 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 01:28:58,805 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 01:28:58,805 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 01:28:58,819 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 01:28:58,819 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 01:28:58,821 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 01:28:58,821 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 01:28:58,821 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 01:28:58,821 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 01:28:58,821 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 01:28:58,822 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 01:28:58,822 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 01:28:58,822 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 01:28:58,822 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 01:28:58,822 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 01:28:58,823 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 01:28:58,823 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 01:28:58,823 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 01:28:58,823 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 01:28:58,823 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 01:28:58,824 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 01:28:58,824 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 01:28:58,824 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 01:28:58,824 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 01:28:58,824 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 01:28:58,825 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 01:28:58,825 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 01:28:58,825 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 01:28:58,825 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 01:28:58,826 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 01:28:58,826 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 01:28:58,826 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 01:28:58,826 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> CAMEL_SMT_AM [2020-07-20 01:28:59,128 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 01:28:59,146 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 01:28:59,150 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 01:28:59,153 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 01:28:59,154 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 01:28:59,155 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-regression/test24-2.c [2020-07-20 01:28:59,228 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bf04f30ad/b73d81032ef04e78b44f6da0d6f5391d/FLAGfe406786e [2020-07-20 01:28:59,752 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 01:28:59,752 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/ldv-regression/test24-2.c [2020-07-20 01:28:59,759 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bf04f30ad/b73d81032ef04e78b44f6da0d6f5391d/FLAGfe406786e [2020-07-20 01:29:00,142 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bf04f30ad/b73d81032ef04e78b44f6da0d6f5391d [2020-07-20 01:29:00,151 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 01:29:00,154 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 01:29:00,154 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 01:29:00,155 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 01:29:00,158 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 01:29:00,159 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:29:00" (1/1) ... [2020-07-20 01:29:00,162 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@e07d769 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:29:00, skipping insertion in model container [2020-07-20 01:29:00,163 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:29:00" (1/1) ... [2020-07-20 01:29:00,170 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 01:29:00,188 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 01:29:00,379 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 01:29:00,388 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 01:29:00,410 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 01:29:00,514 INFO L208 MainTranslator]: Completed translation [2020-07-20 01:29:00,514 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:29:00 WrapperNode [2020-07-20 01:29:00,515 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 01:29:00,515 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 01:29:00,517 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 01:29:00,517 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 01:29:00,529 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:29:00" (1/1) ... [2020-07-20 01:29:00,530 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:29:00" (1/1) ... [2020-07-20 01:29:00,538 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:29:00" (1/1) ... [2020-07-20 01:29:00,539 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:29:00" (1/1) ... [2020-07-20 01:29:00,546 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:29:00" (1/1) ... [2020-07-20 01:29:00,551 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:29:00" (1/1) ... [2020-07-20 01:29:00,553 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:29:00" (1/1) ... [2020-07-20 01:29:00,555 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 01:29:00,556 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 01:29:00,556 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 01:29:00,556 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 01:29:00,557 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:29:00" (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 [2020-07-20 01:29:00,618 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 01:29:00,618 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 01:29:00,618 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2020-07-20 01:29:00,618 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 01:29:00,619 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 01:29:00,619 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 01:29:00,619 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-07-20 01:29:00,620 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-20 01:29:00,620 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 01:29:00,620 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-20 01:29:00,620 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-20 01:29:00,621 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-20 01:29:00,622 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 01:29:00,622 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 01:29:00,927 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 01:29:00,927 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-07-20 01:29:00,931 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:29:00 BoogieIcfgContainer [2020-07-20 01:29:00,932 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 01:29:00,933 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 01:29:00,933 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 01:29:00,937 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 01:29:00,937 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 01:29:00" (1/3) ... [2020-07-20 01:29:00,938 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@86520c4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:29:00, skipping insertion in model container [2020-07-20 01:29:00,938 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:29:00" (2/3) ... [2020-07-20 01:29:00,938 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@86520c4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:29:00, skipping insertion in model container [2020-07-20 01:29:00,939 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:29:00" (3/3) ... [2020-07-20 01:29:00,940 INFO L109 eAbstractionObserver]: Analyzing ICFG test24-2.c [2020-07-20 01:29:00,951 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-07-20 01:29:00,958 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 01:29:00,973 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 01:29:00,996 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 01:29:00,996 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 01:29:00,997 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-07-20 01:29:00,997 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 01:29:00,997 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 01:29:00,997 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 01:29:00,997 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 01:29:00,997 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 01:29:01,013 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-07-20 01:29:01,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-20 01:29:01,019 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 01:29:01,020 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 01:29:01,021 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 01:29:01,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 01:29:01,027 INFO L82 PathProgramCache]: Analyzing trace with hash 855240046, now seen corresponding path program 1 times [2020-07-20 01:29:01,037 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 01:29:01,037 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [859180008] [2020-07-20 01:29:01,038 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@6fba916f [2020-07-20 01:29:01,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:01,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:01,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:01,227 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 01:29:01,228 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [859180008] [2020-07-20 01:29:01,229 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 01:29:01,229 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 01:29:01,230 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [863465893] [2020-07-20 01:29:01,235 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 01:29:01,236 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 01:29:01,247 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 01:29:01,247 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 01:29:01,249 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 3 states. [2020-07-20 01:29:01,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 01:29:01,356 INFO L93 Difference]: Finished difference Result 42 states and 50 transitions. [2020-07-20 01:29:01,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 01:29:01,358 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-07-20 01:29:01,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 01:29:01,369 INFO L225 Difference]: With dead ends: 42 [2020-07-20 01:29:01,369 INFO L226 Difference]: Without dead ends: 20 [2020-07-20 01:29:01,374 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 01:29:01,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-07-20 01:29:01,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-07-20 01:29:01,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-07-20 01:29:01,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2020-07-20 01:29:01,417 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2020-07-20 01:29:01,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 01:29:01,417 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2020-07-20 01:29:01,417 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 01:29:01,417 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2020-07-20 01:29:01,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-20 01:29:01,418 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 01:29:01,419 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 01:29:01,419 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-07-20 01:29:01,420 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 01:29:01,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 01:29:01,420 INFO L82 PathProgramCache]: Analyzing trace with hash -1631497781, now seen corresponding path program 1 times [2020-07-20 01:29:01,421 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 01:29:01,421 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1928837573] [2020-07-20 01:29:01,422 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@6fba916f [2020-07-20 01:29:01,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:01,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:01,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:01,510 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 01:29:01,510 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1928837573] [2020-07-20 01:29:01,511 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 01:29:01,511 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 01:29:01,511 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1616427] [2020-07-20 01:29:01,513 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 01:29:01,513 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 01:29:01,514 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 01:29:01,514 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 01:29:01,515 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 4 states. [2020-07-20 01:29:01,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 01:29:01,575 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2020-07-20 01:29:01,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 01:29:01,576 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2020-07-20 01:29:01,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 01:29:01,577 INFO L225 Difference]: With dead ends: 34 [2020-07-20 01:29:01,577 INFO L226 Difference]: Without dead ends: 22 [2020-07-20 01:29:01,579 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 01:29:01,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-07-20 01:29:01,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-07-20 01:29:01,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 01:29:01,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-07-20 01:29:01,586 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 18 [2020-07-20 01:29:01,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 01:29:01,587 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-07-20 01:29:01,587 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 01:29:01,587 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-07-20 01:29:01,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 01:29:01,588 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 01:29:01,588 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] [2020-07-20 01:29:01,588 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-07-20 01:29:01,589 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 01:29:01,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 01:29:01,589 INFO L82 PathProgramCache]: Analyzing trace with hash 1934775405, now seen corresponding path program 1 times [2020-07-20 01:29:01,590 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 01:29:01,590 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1321110516] [2020-07-20 01:29:01,590 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@6fba916f [2020-07-20 01:29:01,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:01,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:01,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:01,673 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 01:29:01,674 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1321110516] [2020-07-20 01:29:01,674 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [620975137] [2020-07-20 01:29:01,674 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@2e0adb53 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 01:29:01,782 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@2e0adb53 issued 3 check-sat command(s) [2020-07-20 01:29:01,782 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 01:29:01,785 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 01:29:01,793 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 01:29:01,853 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 01:29:01,855 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 01:29:01,855 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2020-07-20 01:29:01,856 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [84767359] [2020-07-20 01:29:01,858 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 01:29:01,858 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 01:29:01,859 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 01:29:01,859 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-07-20 01:29:01,859 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 6 states. [2020-07-20 01:29:01,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 01:29:01,946 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2020-07-20 01:29:01,946 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 01:29:01,946 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-07-20 01:29:01,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 01:29:01,947 INFO L225 Difference]: With dead ends: 36 [2020-07-20 01:29:01,948 INFO L226 Difference]: Without dead ends: 24 [2020-07-20 01:29:01,948 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-07-20 01:29:01,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-20 01:29:01,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-07-20 01:29:01,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-07-20 01:29:01,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2020-07-20 01:29:01,955 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 20 [2020-07-20 01:29:01,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 01:29:01,955 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2020-07-20 01:29:01,956 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 01:29:01,956 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2020-07-20 01:29:01,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 01:29:01,957 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 01:29:01,957 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] [2020-07-20 01:29:02,172 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-07-20 01:29:02,172 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 01:29:02,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 01:29:02,173 INFO L82 PathProgramCache]: Analyzing trace with hash 1739404943, now seen corresponding path program 2 times [2020-07-20 01:29:02,174 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 01:29:02,175 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1835567663] [2020-07-20 01:29:02,175 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@6fba916f [2020-07-20 01:29:02,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:02,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:02,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:02,269 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 01:29:02,269 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1835567663] [2020-07-20 01:29:02,270 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1842075400] [2020-07-20 01:29:02,270 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@577af0e No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 01:29:02,369 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@577af0e issued 3 check-sat command(s) [2020-07-20 01:29:02,370 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 01:29:02,371 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 01:29:02,373 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 01:29:02,392 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 01:29:02,392 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 01:29:02,392 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2020-07-20 01:29:02,393 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1905822347] [2020-07-20 01:29:02,393 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-20 01:29:02,393 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 01:29:02,394 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-20 01:29:02,394 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-07-20 01:29:02,394 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 7 states. [2020-07-20 01:29:02,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 01:29:02,455 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2020-07-20 01:29:02,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 01:29:02,456 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2020-07-20 01:29:02,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 01:29:02,457 INFO L225 Difference]: With dead ends: 38 [2020-07-20 01:29:02,457 INFO L226 Difference]: Without dead ends: 26 [2020-07-20 01:29:02,458 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-07-20 01:29:02,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-07-20 01:29:02,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2020-07-20 01:29:02,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-07-20 01:29:02,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2020-07-20 01:29:02,463 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 22 [2020-07-20 01:29:02,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 01:29:02,464 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2020-07-20 01:29:02,464 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-20 01:29:02,464 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2020-07-20 01:29:02,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-20 01:29:02,465 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 01:29:02,465 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 01:29:02,678 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 01:29:02,679 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 01:29:02,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 01:29:02,680 INFO L82 PathProgramCache]: Analyzing trace with hash -1328015311, now seen corresponding path program 3 times [2020-07-20 01:29:02,680 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 01:29:02,681 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2103184003] [2020-07-20 01:29:02,681 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@6fba916f [2020-07-20 01:29:02,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:02,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:02,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:02,814 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 01:29:02,814 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2103184003] [2020-07-20 01:29:02,814 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [969077389] [2020-07-20 01:29:02,815 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@620830b1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 01:29:02,904 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@620830b1 issued 3 check-sat command(s) [2020-07-20 01:29:02,904 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 01:29:02,906 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 01:29:02,908 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 01:29:02,924 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 01:29:02,924 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 01:29:02,925 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2020-07-20 01:29:02,925 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [542266434] [2020-07-20 01:29:02,925 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 01:29:02,926 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 01:29:02,926 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 01:29:02,926 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-07-20 01:29:02,926 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 8 states. [2020-07-20 01:29:02,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 01:29:02,994 INFO L93 Difference]: Finished difference Result 40 states and 42 transitions. [2020-07-20 01:29:02,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 01:29:02,995 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2020-07-20 01:29:02,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 01:29:02,996 INFO L225 Difference]: With dead ends: 40 [2020-07-20 01:29:02,996 INFO L226 Difference]: Without dead ends: 28 [2020-07-20 01:29:02,997 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-07-20 01:29:02,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-20 01:29:03,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-07-20 01:29:03,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-20 01:29:03,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-07-20 01:29:03,002 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 24 [2020-07-20 01:29:03,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 01:29:03,003 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-07-20 01:29:03,003 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 01:29:03,003 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-07-20 01:29:03,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 01:29:03,004 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 01:29:03,004 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 01:29:03,216 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 01:29:03,217 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 01:29:03,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 01:29:03,218 INFO L82 PathProgramCache]: Analyzing trace with hash 1523652947, now seen corresponding path program 4 times [2020-07-20 01:29:03,218 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 01:29:03,219 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [84166734] [2020-07-20 01:29:03,219 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@6fba916f [2020-07-20 01:29:03,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:03,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:03,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:03,332 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 01:29:03,332 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [84166734] [2020-07-20 01:29:03,332 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1631981556] [2020-07-20 01:29:03,333 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@4abe8382 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 01:29:03,446 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@4abe8382 issued 3 check-sat command(s) [2020-07-20 01:29:03,447 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 01:29:03,448 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 01:29:03,450 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 01:29:03,477 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 01:29:03,478 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 01:29:03,478 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2020-07-20 01:29:03,478 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [419652615] [2020-07-20 01:29:03,479 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 01:29:03,479 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 01:29:03,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 01:29:03,481 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-07-20 01:29:03,481 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 9 states. [2020-07-20 01:29:03,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 01:29:03,551 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2020-07-20 01:29:03,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 01:29:03,552 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-20 01:29:03,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 01:29:03,553 INFO L225 Difference]: With dead ends: 42 [2020-07-20 01:29:03,553 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 01:29:03,554 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-07-20 01:29:03,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 01:29:03,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-07-20 01:29:03,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-07-20 01:29:03,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2020-07-20 01:29:03,563 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 26 [2020-07-20 01:29:03,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 01:29:03,564 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2020-07-20 01:29:03,564 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 01:29:03,564 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2020-07-20 01:29:03,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-20 01:29:03,565 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 01:29:03,566 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 01:29:03,779 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 01:29:03,780 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 01:29:03,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 01:29:03,780 INFO L82 PathProgramCache]: Analyzing trace with hash 1787714037, now seen corresponding path program 5 times [2020-07-20 01:29:03,781 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 01:29:03,781 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1230520383] [2020-07-20 01:29:03,782 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@6fba916f [2020-07-20 01:29:03,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:03,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:03,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:03,872 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 01:29:03,872 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1230520383] [2020-07-20 01:29:03,873 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1940059783] [2020-07-20 01:29:03,873 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@732ec5d9 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 01:29:04,062 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@732ec5d9 issued 3 check-sat command(s) [2020-07-20 01:29:04,062 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 01:29:04,064 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 01:29:04,067 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 01:29:04,088 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 01:29:04,088 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 01:29:04,089 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2020-07-20 01:29:04,089 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [737807617] [2020-07-20 01:29:04,089 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 01:29:04,090 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 01:29:04,090 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 01:29:04,090 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-07-20 01:29:04,091 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 10 states. [2020-07-20 01:29:04,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 01:29:04,178 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2020-07-20 01:29:04,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 01:29:04,179 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-07-20 01:29:04,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 01:29:04,181 INFO L225 Difference]: With dead ends: 44 [2020-07-20 01:29:04,181 INFO L226 Difference]: Without dead ends: 32 [2020-07-20 01:29:04,182 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-07-20 01:29:04,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-20 01:29:04,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-07-20 01:29:04,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 01:29:04,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2020-07-20 01:29:04,190 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 28 [2020-07-20 01:29:04,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 01:29:04,190 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2020-07-20 01:29:04,190 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 01:29:04,190 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2020-07-20 01:29:04,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-07-20 01:29:04,191 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 01:29:04,192 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 01:29:04,404 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2020-07-20 01:29:04,405 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 01:29:04,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 01:29:04,406 INFO L82 PathProgramCache]: Analyzing trace with hash 2147351063, now seen corresponding path program 6 times [2020-07-20 01:29:04,406 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 01:29:04,407 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [864962746] [2020-07-20 01:29:04,408 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@6fba916f [2020-07-20 01:29:04,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:04,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:04,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:04,567 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 01:29:04,567 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [864962746] [2020-07-20 01:29:04,568 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [409079318] [2020-07-20 01:29:04,568 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@22aec174 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 01:29:04,857 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@22aec174 issued 3 check-sat command(s) [2020-07-20 01:29:04,857 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 01:29:04,859 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 01:29:04,861 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 01:29:04,878 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 01:29:04,879 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 01:29:04,879 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2020-07-20 01:29:04,879 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [996124896] [2020-07-20 01:29:04,880 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 01:29:04,880 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 01:29:04,881 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 01:29:04,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-07-20 01:29:04,881 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 11 states. [2020-07-20 01:29:04,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 01:29:04,967 INFO L93 Difference]: Finished difference Result 46 states and 48 transitions. [2020-07-20 01:29:04,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 01:29:04,968 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-07-20 01:29:04,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 01:29:04,969 INFO L225 Difference]: With dead ends: 46 [2020-07-20 01:29:04,969 INFO L226 Difference]: Without dead ends: 34 [2020-07-20 01:29:04,970 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-07-20 01:29:04,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-07-20 01:29:04,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-07-20 01:29:04,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-20 01:29:04,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-07-20 01:29:04,976 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 30 [2020-07-20 01:29:04,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 01:29:04,976 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-07-20 01:29:04,976 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 01:29:04,976 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-07-20 01:29:04,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-07-20 01:29:04,977 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 01:29:04,977 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 01:29:05,188 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 01:29:05,189 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 01:29:05,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 01:29:05,189 INFO L82 PathProgramCache]: Analyzing trace with hash -133817927, now seen corresponding path program 7 times [2020-07-20 01:29:05,190 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 01:29:05,190 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1318282565] [2020-07-20 01:29:05,191 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@6fba916f [2020-07-20 01:29:05,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:05,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:05,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:05,292 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 01:29:05,293 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1318282565] [2020-07-20 01:29:05,293 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [997071898] [2020-07-20 01:29:05,293 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@3bb55484 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 01:29:06,059 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@3bb55484 issued 3 check-sat command(s) [2020-07-20 01:29:06,060 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 01:29:06,064 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-20 01:29:06,066 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 01:29:06,084 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 01:29:06,085 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 01:29:06,085 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2020-07-20 01:29:06,085 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2145857935] [2020-07-20 01:29:06,086 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 01:29:06,086 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 01:29:06,086 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 01:29:06,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-07-20 01:29:06,087 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 12 states. [2020-07-20 01:29:06,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 01:29:06,178 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-07-20 01:29:06,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 01:29:06,178 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2020-07-20 01:29:06,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 01:29:06,179 INFO L225 Difference]: With dead ends: 48 [2020-07-20 01:29:06,179 INFO L226 Difference]: Without dead ends: 36 [2020-07-20 01:29:06,180 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-07-20 01:29:06,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-20 01:29:06,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-07-20 01:29:06,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 01:29:06,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2020-07-20 01:29:06,185 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 32 [2020-07-20 01:29:06,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 01:29:06,186 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2020-07-20 01:29:06,186 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 01:29:06,186 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2020-07-20 01:29:06,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-07-20 01:29:06,187 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 01:29:06,187 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 01:29:06,396 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 01:29:06,397 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 01:29:06,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 01:29:06,398 INFO L82 PathProgramCache]: Analyzing trace with hash -1903896357, now seen corresponding path program 8 times [2020-07-20 01:29:06,398 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 01:29:06,399 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1204331603] [2020-07-20 01:29:06,399 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@6fba916f [2020-07-20 01:29:06,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:06,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:06,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:06,527 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 01:29:06,527 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1204331603] [2020-07-20 01:29:06,528 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [257668535] [2020-07-20 01:29:06,528 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@3332f951 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 01:29:07,529 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@3332f951 issued 3 check-sat command(s) [2020-07-20 01:29:07,529 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 01:29:07,536 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 01:29:07,538 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 01:29:07,559 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 01:29:07,559 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 01:29:07,559 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2020-07-20 01:29:07,560 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1508401288] [2020-07-20 01:29:07,560 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 01:29:07,560 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 01:29:07,561 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 01:29:07,561 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-07-20 01:29:07,561 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 13 states. [2020-07-20 01:29:07,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 01:29:07,656 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2020-07-20 01:29:07,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 01:29:07,656 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 34 [2020-07-20 01:29:07,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 01:29:07,658 INFO L225 Difference]: With dead ends: 50 [2020-07-20 01:29:07,658 INFO L226 Difference]: Without dead ends: 38 [2020-07-20 01:29:07,659 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-07-20 01:29:07,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-20 01:29:07,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-07-20 01:29:07,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-07-20 01:29:07,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2020-07-20 01:29:07,670 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 34 [2020-07-20 01:29:07,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 01:29:07,671 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2020-07-20 01:29:07,671 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 01:29:07,671 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2020-07-20 01:29:07,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-07-20 01:29:07,672 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 01:29:07,672 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 01:29:07,876 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2020-07-20 01:29:07,876 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 01:29:07,876 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 01:29:07,877 INFO L82 PathProgramCache]: Analyzing trace with hash -2142218371, now seen corresponding path program 9 times [2020-07-20 01:29:07,877 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 01:29:07,877 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1684681612] [2020-07-20 01:29:07,877 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@6fba916f [2020-07-20 01:29:07,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:08,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:08,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:08,021 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 01:29:08,022 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1684681612] [2020-07-20 01:29:08,022 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [206349532] [2020-07-20 01:29:08,022 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@3a833e81 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 01:29:09,191 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@3a833e81 issued 3 check-sat command(s) [2020-07-20 01:29:09,191 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 01:29:09,198 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 01:29:09,200 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 01:29:09,221 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 01:29:09,221 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 01:29:09,221 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2020-07-20 01:29:09,221 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [457276172] [2020-07-20 01:29:09,222 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 01:29:09,222 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 01:29:09,222 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 01:29:09,223 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-07-20 01:29:09,223 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 14 states. [2020-07-20 01:29:09,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 01:29:09,335 INFO L93 Difference]: Finished difference Result 52 states and 54 transitions. [2020-07-20 01:29:09,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 01:29:09,335 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-07-20 01:29:09,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 01:29:09,336 INFO L225 Difference]: With dead ends: 52 [2020-07-20 01:29:09,336 INFO L226 Difference]: Without dead ends: 40 [2020-07-20 01:29:09,337 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-07-20 01:29:09,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-07-20 01:29:09,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-07-20 01:29:09,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-07-20 01:29:09,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-07-20 01:29:09,347 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 36 [2020-07-20 01:29:09,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 01:29:09,347 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-07-20 01:29:09,347 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 01:29:09,347 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-07-20 01:29:09,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-07-20 01:29:09,348 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 01:29:09,348 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 01:29:09,555 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 01:29:09,557 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 01:29:09,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 01:29:09,557 INFO L82 PathProgramCache]: Analyzing trace with hash 758560159, now seen corresponding path program 10 times [2020-07-20 01:29:09,558 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 01:29:09,558 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1403831256] [2020-07-20 01:29:09,558 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@6fba916f [2020-07-20 01:29:09,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:09,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:09,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:09,687 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 01:29:09,687 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1403831256] [2020-07-20 01:29:09,688 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [46098265] [2020-07-20 01:29:09,688 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@5e950d1a No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 01:29:11,269 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@5e950d1a issued 3 check-sat command(s) [2020-07-20 01:29:11,270 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 01:29:11,280 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 01:29:11,282 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 01:29:11,304 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 01:29:11,305 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 01:29:11,305 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2020-07-20 01:29:11,305 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1009312527] [2020-07-20 01:29:11,306 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 01:29:11,306 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 01:29:11,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 01:29:11,307 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-07-20 01:29:11,307 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 15 states. [2020-07-20 01:29:11,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 01:29:11,418 INFO L93 Difference]: Finished difference Result 54 states and 56 transitions. [2020-07-20 01:29:11,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 01:29:11,419 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 38 [2020-07-20 01:29:11,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 01:29:11,420 INFO L225 Difference]: With dead ends: 54 [2020-07-20 01:29:11,420 INFO L226 Difference]: Without dead ends: 42 [2020-07-20 01:29:11,421 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-07-20 01:29:11,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-20 01:29:11,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-07-20 01:29:11,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-20 01:29:11,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2020-07-20 01:29:11,426 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 38 [2020-07-20 01:29:11,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 01:29:11,426 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2020-07-20 01:29:11,426 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 01:29:11,426 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2020-07-20 01:29:11,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-20 01:29:11,427 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 01:29:11,428 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 01:29:11,633 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 01:29:11,634 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 01:29:11,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 01:29:11,635 INFO L82 PathProgramCache]: Analyzing trace with hash 972952385, now seen corresponding path program 11 times [2020-07-20 01:29:11,636 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 01:29:11,636 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1125927343] [2020-07-20 01:29:11,636 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@6fba916f [2020-07-20 01:29:11,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:11,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:11,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:11,775 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 01:29:11,776 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1125927343] [2020-07-20 01:29:11,776 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [90406553] [2020-07-20 01:29:11,776 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@25d519e5 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 01:29:14,102 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@25d519e5 issued 4 check-sat command(s) [2020-07-20 01:29:14,102 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 01:29:14,116 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 01:29:14,119 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 01:29:14,159 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 01:29:14,160 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 01:29:14,160 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2020-07-20 01:29:14,161 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1475539530] [2020-07-20 01:29:14,161 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 01:29:14,161 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 01:29:14,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 01:29:14,162 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-07-20 01:29:14,162 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand 16 states. [2020-07-20 01:29:14,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 01:29:14,260 INFO L93 Difference]: Finished difference Result 56 states and 58 transitions. [2020-07-20 01:29:14,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 01:29:14,260 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 40 [2020-07-20 01:29:14,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 01:29:14,261 INFO L225 Difference]: With dead ends: 56 [2020-07-20 01:29:14,261 INFO L226 Difference]: Without dead ends: 44 [2020-07-20 01:29:14,262 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-07-20 01:29:14,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-07-20 01:29:14,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-07-20 01:29:14,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-07-20 01:29:14,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2020-07-20 01:29:14,267 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 40 [2020-07-20 01:29:14,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 01:29:14,267 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2020-07-20 01:29:14,268 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 01:29:14,268 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2020-07-20 01:29:14,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-07-20 01:29:14,268 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 01:29:14,269 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 01:29:14,475 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2020-07-20 01:29:14,475 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 01:29:14,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 01:29:14,476 INFO L82 PathProgramCache]: Analyzing trace with hash 845451363, now seen corresponding path program 12 times [2020-07-20 01:29:14,476 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 01:29:14,477 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [921939089] [2020-07-20 01:29:14,477 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@6fba916f [2020-07-20 01:29:14,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:14,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:14,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:14,651 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 01:29:14,652 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [921939089] [2020-07-20 01:29:14,652 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1868113839] [2020-07-20 01:29:14,653 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@7cc8a7c8 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 01:29:20,964 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@7cc8a7c8 issued 3 check-sat command(s) [2020-07-20 01:29:20,964 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 01:29:21,013 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 01:29:21,015 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 01:29:21,042 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 01:29:21,042 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 01:29:21,042 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2020-07-20 01:29:21,043 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1547468649] [2020-07-20 01:29:21,043 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 01:29:21,043 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 01:29:21,044 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 01:29:21,044 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-07-20 01:29:21,045 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand 17 states. [2020-07-20 01:29:21,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 01:29:21,169 INFO L93 Difference]: Finished difference Result 58 states and 60 transitions. [2020-07-20 01:29:21,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 01:29:21,169 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 42 [2020-07-20 01:29:21,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 01:29:21,170 INFO L225 Difference]: With dead ends: 58 [2020-07-20 01:29:21,170 INFO L226 Difference]: Without dead ends: 46 [2020-07-20 01:29:21,172 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-07-20 01:29:21,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-07-20 01:29:21,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-07-20 01:29:21,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-20 01:29:21,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2020-07-20 01:29:21,178 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 42 [2020-07-20 01:29:21,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 01:29:21,178 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2020-07-20 01:29:21,178 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 01:29:21,178 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2020-07-20 01:29:21,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-07-20 01:29:21,179 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 01:29:21,179 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 01:29:21,380 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2020-07-20 01:29:21,380 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 01:29:21,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 01:29:21,381 INFO L82 PathProgramCache]: Analyzing trace with hash -1423946491, now seen corresponding path program 13 times [2020-07-20 01:29:21,382 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 01:29:21,382 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [84600511] [2020-07-20 01:29:21,382 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@6fba916f [2020-07-20 01:29:21,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:21,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:21,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:21,552 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 01:29:21,553 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [84600511] [2020-07-20 01:29:21,553 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2051936970] [2020-07-20 01:29:21,553 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@4f591781 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 01:29:30,928 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@4f591781 issued 4 check-sat command(s) [2020-07-20 01:29:30,928 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 01:29:31,002 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 01:29:31,004 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 01:29:31,024 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 01:29:31,024 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 01:29:31,024 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2020-07-20 01:29:31,025 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [349813257] [2020-07-20 01:29:31,025 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 01:29:31,025 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 01:29:31,026 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 01:29:31,026 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-07-20 01:29:31,026 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 18 states. [2020-07-20 01:29:31,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 01:29:31,144 INFO L93 Difference]: Finished difference Result 60 states and 62 transitions. [2020-07-20 01:29:31,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-20 01:29:31,144 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 44 [2020-07-20 01:29:31,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 01:29:31,146 INFO L225 Difference]: With dead ends: 60 [2020-07-20 01:29:31,146 INFO L226 Difference]: Without dead ends: 48 [2020-07-20 01:29:31,146 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-07-20 01:29:31,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-20 01:29:31,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2020-07-20 01:29:31,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-07-20 01:29:31,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2020-07-20 01:29:31,152 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 44 [2020-07-20 01:29:31,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 01:29:31,152 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2020-07-20 01:29:31,152 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 01:29:31,152 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2020-07-20 01:29:31,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-07-20 01:29:31,153 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 01:29:31,153 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 01:29:31,360 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2020-07-20 01:29:31,360 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 01:29:31,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 01:29:31,361 INFO L82 PathProgramCache]: Analyzing trace with hash -471897817, now seen corresponding path program 14 times [2020-07-20 01:29:31,361 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 01:29:31,362 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [4116231] [2020-07-20 01:29:31,362 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@6fba916f [2020-07-20 01:29:31,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:31,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:31,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:31,596 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 01:29:31,597 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [4116231] [2020-07-20 01:29:31,597 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [639847080] [2020-07-20 01:29:31,597 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@6b4f21cb No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 01:29:48,029 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@6b4f21cb issued 4 check-sat command(s) [2020-07-20 01:29:48,029 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 01:29:48,158 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 01:29:48,160 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 01:29:48,179 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 01:29:48,179 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 01:29:48,179 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2020-07-20 01:29:48,180 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2088316866] [2020-07-20 01:29:48,180 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 01:29:48,180 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 01:29:48,181 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 01:29:48,181 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-07-20 01:29:48,181 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand 19 states. [2020-07-20 01:29:48,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 01:29:48,285 INFO L93 Difference]: Finished difference Result 62 states and 64 transitions. [2020-07-20 01:29:48,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-20 01:29:48,285 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 46 [2020-07-20 01:29:48,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 01:29:48,286 INFO L225 Difference]: With dead ends: 62 [2020-07-20 01:29:48,286 INFO L226 Difference]: Without dead ends: 50 [2020-07-20 01:29:48,287 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-07-20 01:29:48,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-07-20 01:29:48,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2020-07-20 01:29:48,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-07-20 01:29:48,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2020-07-20 01:29:48,300 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 46 [2020-07-20 01:29:48,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 01:29:48,300 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2020-07-20 01:29:48,300 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 01:29:48,301 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2020-07-20 01:29:48,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-07-20 01:29:48,303 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 01:29:48,303 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 01:29:48,509 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 01:29:48,510 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 01:29:48,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 01:29:48,511 INFO L82 PathProgramCache]: Analyzing trace with hash -381156151, now seen corresponding path program 15 times [2020-07-20 01:29:48,511 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 01:29:48,511 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1921464737] [2020-07-20 01:29:48,512 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@6fba916f [2020-07-20 01:29:48,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:48,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:48,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:29:48,768 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 01:29:48,769 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1921464737] [2020-07-20 01:29:48,769 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1647904519] [2020-07-20 01:29:48,769 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@5c634955 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 01:30:34,362 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@5c634955 issued 4 check-sat command(s) [2020-07-20 01:30:34,362 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 01:30:34,940 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-20 01:30:34,941 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 01:30:34,971 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 01:30:34,971 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 01:30:34,971 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2020-07-20 01:30:34,971 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [855805601] [2020-07-20 01:30:34,972 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 01:30:34,972 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 01:30:34,973 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 01:30:34,973 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-07-20 01:30:34,974 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand 20 states. [2020-07-20 01:30:35,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 01:30:35,098 INFO L93 Difference]: Finished difference Result 64 states and 66 transitions. [2020-07-20 01:30:35,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-20 01:30:35,099 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 48 [2020-07-20 01:30:35,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 01:30:35,100 INFO L225 Difference]: With dead ends: 64 [2020-07-20 01:30:35,100 INFO L226 Difference]: Without dead ends: 52 [2020-07-20 01:30:35,101 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-07-20 01:30:35,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-07-20 01:30:35,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-07-20 01:30:35,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-20 01:30:35,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2020-07-20 01:30:35,106 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 48 [2020-07-20 01:30:35,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 01:30:35,106 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2020-07-20 01:30:35,107 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 01:30:35,107 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2020-07-20 01:30:35,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-07-20 01:30:35,107 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 01:30:35,107 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 01:30:35,311 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2020-07-20 01:30:35,311 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 01:30:35,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 01:30:35,312 INFO L82 PathProgramCache]: Analyzing trace with hash 922238955, now seen corresponding path program 16 times [2020-07-20 01:30:35,312 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 01:30:35,313 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1662888308] [2020-07-20 01:30:35,313 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@6fba916f [2020-07-20 01:30:35,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:30:35,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:30:35,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:30:35,560 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 01:30:35,560 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1662888308] [2020-07-20 01:30:35,561 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [199567177] [2020-07-20 01:30:35,561 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@3311df15 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 01:31:21,045 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@3311df15 issued 4 check-sat command(s) [2020-07-20 01:31:21,045 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 01:31:21,670 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 01:31:21,671 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 01:31:21,698 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 01:31:21,699 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 01:31:21,699 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2020-07-20 01:31:21,699 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2122497357] [2020-07-20 01:31:21,701 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 01:31:21,701 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 01:31:21,702 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 01:31:21,703 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-07-20 01:31:21,703 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 21 states. [2020-07-20 01:31:21,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 01:31:21,817 INFO L93 Difference]: Finished difference Result 66 states and 68 transitions. [2020-07-20 01:31:21,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-20 01:31:21,817 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 50 [2020-07-20 01:31:21,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 01:31:21,818 INFO L225 Difference]: With dead ends: 66 [2020-07-20 01:31:21,818 INFO L226 Difference]: Without dead ends: 54 [2020-07-20 01:31:21,819 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-07-20 01:31:21,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-07-20 01:31:21,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-07-20 01:31:21,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-07-20 01:31:21,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 54 transitions. [2020-07-20 01:31:21,823 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 54 transitions. Word has length 50 [2020-07-20 01:31:21,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 01:31:21,824 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 54 transitions. [2020-07-20 01:31:21,824 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 01:31:21,824 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 54 transitions. [2020-07-20 01:31:21,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-07-20 01:31:21,825 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 01:31:21,825 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 01:31:22,036 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2020-07-20 01:31:22,037 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 01:31:22,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 01:31:22,037 INFO L82 PathProgramCache]: Analyzing trace with hash -645514611, now seen corresponding path program 17 times [2020-07-20 01:31:22,037 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 01:31:22,038 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1242067525] [2020-07-20 01:31:22,038 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@6fba916f [2020-07-20 01:31:22,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:31:22,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:31:22,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:31:22,304 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 01:31:22,304 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1242067525] [2020-07-20 01:31:22,304 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [954219092] [2020-07-20 01:31:22,304 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@8a04066 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 01:33:01,749 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@8a04066 issued 4 check-sat command(s) [2020-07-20 01:33:01,749 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 01:33:03,663 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 01:33:03,664 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 01:33:03,683 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 01:33:03,683 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 01:33:03,683 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2020-07-20 01:33:03,684 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [526465046] [2020-07-20 01:33:03,684 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 01:33:03,684 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 01:33:03,685 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 01:33:03,685 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-07-20 01:33:03,685 INFO L87 Difference]: Start difference. First operand 53 states and 54 transitions. Second operand 22 states. [2020-07-20 01:33:03,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 01:33:03,776 INFO L93 Difference]: Finished difference Result 68 states and 70 transitions. [2020-07-20 01:33:03,777 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-20 01:33:03,777 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 52 [2020-07-20 01:33:03,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 01:33:03,778 INFO L225 Difference]: With dead ends: 68 [2020-07-20 01:33:03,778 INFO L226 Difference]: Without dead ends: 56 [2020-07-20 01:33:03,779 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-07-20 01:33:03,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-07-20 01:33:03,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-07-20 01:33:03,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-20 01:33:03,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2020-07-20 01:33:03,788 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 52 [2020-07-20 01:33:03,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 01:33:03,789 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2020-07-20 01:33:03,789 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 01:33:03,789 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2020-07-20 01:33:03,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-07-20 01:33:03,792 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 01:33:03,793 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 01:33:04,006 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 01:33:04,006 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 01:33:04,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 01:33:04,007 INFO L82 PathProgramCache]: Analyzing trace with hash 276829359, now seen corresponding path program 18 times [2020-07-20 01:33:04,008 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 01:33:04,008 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [653889898] [2020-07-20 01:33:04,008 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@6fba916f [2020-07-20 01:33:04,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:33:04,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:33:04,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 01:33:04,349 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 01:33:04,350 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [653889898] [2020-07-20 01:33:04,350 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1432839873] [2020-07-20 01:33:04,350 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@5b3544cc No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true