/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks NOT_INCREMENTALLY -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_15-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 10:59:58,705 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 10:59:58,709 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 10:59:58,732 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 10:59:58,732 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 10:59:58,734 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 10:59:58,736 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 10:59:58,749 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 10:59:58,754 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 10:59:58,757 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 10:59:58,759 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 10:59:58,761 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 10:59:58,761 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 10:59:58,763 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 10:59:58,766 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 10:59:58,768 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 10:59:58,770 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 10:59:58,771 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 10:59:58,773 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 10:59:58,779 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 10:59:58,785 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 10:59:58,791 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 10:59:58,793 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 10:59:58,794 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 10:59:58,796 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 10:59:58,810 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 10:59:58,811 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 10:59:58,812 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 10:59:58,813 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 10:59:58,856 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 10:59:58,856 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 10:59:58,857 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 10:59:58,858 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 10:59:58,858 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 10:59:58,858 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 10:59:58,858 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 10:59:58,858 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 10:59:58,859 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 10:59:58,859 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 10:59:58,859 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 10:59:58,862 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 10:59:58,863 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 10:59:58,863 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 10:59:58,863 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 10:59:58,863 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 10:59:58,864 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 10:59:58,865 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 10:59:58,865 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 10:59:58,865 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 10:59:58,865 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 10:59:58,866 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 10:59:58,866 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 10:59:58,866 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 10:59:58,866 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 10:59:58,866 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 10:59:58,867 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:59:58,867 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 10:59:58,867 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 10:59:58,869 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> NOT_INCREMENTALLY [2020-07-20 10:59:59,207 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 10:59:59,223 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 10:59:59,228 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 10:59:59,229 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 10:59:59,232 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 10:59:59,234 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_15-2.c [2020-07-20 10:59:59,304 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/19e05ccc4/79d17641797f4cbaa1f7ca5fb3d78cb2/FLAG11eb36e03 [2020-07-20 10:59:59,761 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 10:59:59,761 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_15-2.c [2020-07-20 10:59:59,769 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/19e05ccc4/79d17641797f4cbaa1f7ca5fb3d78cb2/FLAG11eb36e03 [2020-07-20 11:00:00,194 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/19e05ccc4/79d17641797f4cbaa1f7ca5fb3d78cb2 [2020-07-20 11:00:00,207 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 11:00:00,211 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 11:00:00,217 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 11:00:00,217 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 11:00:00,221 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 11:00:00,222 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:00:00" (1/1) ... [2020-07-20 11:00:00,225 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6d095aab and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:00, skipping insertion in model container [2020-07-20 11:00:00,225 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:00:00" (1/1) ... [2020-07-20 11:00:00,235 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 11:00:00,256 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 11:00:00,425 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:00:00,430 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 11:00:00,446 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:00:00,459 INFO L208 MainTranslator]: Completed translation [2020-07-20 11:00:00,460 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:00 WrapperNode [2020-07-20 11:00:00,460 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 11:00:00,461 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 11:00:00,461 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 11:00:00,461 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 11:00:00,472 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:00" (1/1) ... [2020-07-20 11:00:00,472 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:00" (1/1) ... [2020-07-20 11:00:00,478 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:00" (1/1) ... [2020-07-20 11:00:00,478 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:00" (1/1) ... [2020-07-20 11:00:00,482 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:00" (1/1) ... [2020-07-20 11:00:00,485 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:00" (1/1) ... [2020-07-20 11:00:00,486 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:00" (1/1) ... [2020-07-20 11:00:00,487 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 11:00:00,488 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 11:00:00,488 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 11:00:00,488 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 11:00:00,489 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:00" (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 11:00:00,638 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 11:00:00,638 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 11:00:00,639 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-20 11:00:00,639 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 11:00:00,639 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 11:00:00,639 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 11:00:00,639 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-20 11:00:00,640 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 11:00:00,640 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 11:00:00,640 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 11:00:00,833 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 11:00:00,833 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 11:00:00,838 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:00:00 BoogieIcfgContainer [2020-07-20 11:00:00,838 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 11:00:00,839 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 11:00:00,840 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 11:00:00,843 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 11:00:00,844 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 11:00:00" (1/3) ... [2020-07-20 11:00:00,845 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1b4019d2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:00:00, skipping insertion in model container [2020-07-20 11:00:00,845 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:00" (2/3) ... [2020-07-20 11:00:00,845 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1b4019d2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:00:00, skipping insertion in model container [2020-07-20 11:00:00,846 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:00:00" (3/3) ... [2020-07-20 11:00:00,848 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_15-2.c [2020-07-20 11:00:00,862 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 11:00:00,871 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 11:00:00,892 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 11:00:00,926 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 11:00:00,927 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 11:00:00,927 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 11:00:00,927 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 11:00:00,928 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 11:00:00,928 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 11:00:00,928 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 11:00:00,928 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 11:00:00,954 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-20 11:00:00,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 11:00:00,962 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:00,963 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:00,964 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:00,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:00,972 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-20 11:00:00,983 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:00,984 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1250464864] [2020-07-20 11:00:00,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:01,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:01,064 INFO L263 TraceCheckSpWp]: Trace formula consists of 31 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 11:00:01,070 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:01,179 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 11:00:01,180 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:00:01,181 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1250464864] [2020-07-20 11:00:01,182 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:00:01,182 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 11:00:01,183 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [272666724] [2020-07-20 11:00:01,188 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 11:00:01,188 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:01,199 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 11:00:01,199 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 11:00:01,202 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-20 11:00:01,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:01,315 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-20 11:00:01,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 11:00:01,317 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 11:00:01,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:01,328 INFO L225 Difference]: With dead ends: 35 [2020-07-20 11:00:01,328 INFO L226 Difference]: Without dead ends: 21 [2020-07-20 11:00:01,332 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 11:00:01,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-20 11:00:01,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-20 11:00:01,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 11:00:01,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 11:00:01,383 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-20 11:00:01,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:01,383 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 11:00:01,384 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 11:00:01,384 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 11:00:01,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 11:00:01,386 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:01,387 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:01,600 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:01,601 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:01,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:01,602 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-20 11:00:01,602 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:01,603 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1011518108] [2020-07-20 11:00:01,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:01,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:01,629 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 11:00:01,631 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:01,676 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 11:00:01,676 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:00:01,677 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1011518108] [2020-07-20 11:00:01,677 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:00:01,677 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 11:00:01,678 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1299232009] [2020-07-20 11:00:01,680 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 11:00:01,681 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:01,681 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 11:00:01,682 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 11:00:01,682 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-20 11:00:01,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:01,774 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-20 11:00:01,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 11:00:01,775 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 11:00:01,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:01,776 INFO L225 Difference]: With dead ends: 27 [2020-07-20 11:00:01,777 INFO L226 Difference]: Without dead ends: 23 [2020-07-20 11:00:01,778 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 11:00:01,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-20 11:00:01,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-20 11:00:01,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 11:00:01,786 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 11:00:01,787 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-20 11:00:01,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:01,787 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 11:00:01,787 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 11:00:01,788 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 11:00:01,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 11:00:01,789 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:01,789 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:02,003 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:02,004 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:02,004 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:02,005 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-20 11:00:02,005 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:02,005 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [32198308] [2020-07-20 11:00:02,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:02,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:02,040 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 11:00:02,043 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:02,091 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 11:00:02,092 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:02,289 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:02,339 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 11:00:02,340 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [32198308] [2020-07-20 11:00:02,340 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:02,341 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 11:00:02,341 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1471275394] [2020-07-20 11:00:02,342 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 11:00:02,342 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:02,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 11:00:02,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 11:00:02,343 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-20 11:00:02,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:02,461 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-20 11:00:02,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 11:00:02,462 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-20 11:00:02,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:02,464 INFO L225 Difference]: With dead ends: 32 [2020-07-20 11:00:02,465 INFO L226 Difference]: Without dead ends: 28 [2020-07-20 11:00:02,465 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-20 11:00:02,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-20 11:00:02,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-20 11:00:02,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 11:00:02,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-20 11:00:02,476 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-20 11:00:02,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:02,476 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-20 11:00:02,476 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 11:00:02,477 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-20 11:00:02,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 11:00:02,478 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:02,478 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:02,693 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:02,694 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:02,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:02,695 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-20 11:00:02,695 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:02,696 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1952162454] [2020-07-20 11:00:02,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:02,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:02,725 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 11:00:02,727 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:02,789 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 11:00:02,789 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:02,959 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:03,013 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 11:00:03,015 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1952162454] [2020-07-20 11:00:03,016 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:03,016 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 11:00:03,016 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [434355017] [2020-07-20 11:00:03,018 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 11:00:03,018 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:03,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 11:00:03,020 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 11:00:03,020 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-20 11:00:03,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:03,139 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-20 11:00:03,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 11:00:03,142 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-20 11:00:03,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:03,148 INFO L225 Difference]: With dead ends: 37 [2020-07-20 11:00:03,148 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 11:00:03,149 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-20 11:00:03,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 11:00:03,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-20 11:00:03,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 11:00:03,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-20 11:00:03,168 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-20 11:00:03,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:03,169 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-20 11:00:03,169 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 11:00:03,169 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-20 11:00:03,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 11:00:03,174 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:03,174 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:03,389 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:03,391 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:03,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:03,392 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-20 11:00:03,392 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:03,393 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [269982633] [2020-07-20 11:00:03,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:03,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:03,423 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 11:00:03,426 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:03,484 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-20 11:00:03,484 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:03,780 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:03,782 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:03,839 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:03,841 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:03,891 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-20 11:00:03,891 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [269982633] [2020-07-20 11:00:03,891 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:03,892 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 11:00:03,892 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1618548338] [2020-07-20 11:00:03,892 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 11:00:03,893 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:03,893 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 11:00:03,893 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 11:00:03,894 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-20 11:00:04,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:04,051 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-20 11:00:04,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 11:00:04,051 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-20 11:00:04,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:04,053 INFO L225 Difference]: With dead ends: 42 [2020-07-20 11:00:04,054 INFO L226 Difference]: Without dead ends: 38 [2020-07-20 11:00:04,054 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 64 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-20 11:00:04,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-20 11:00:04,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-20 11:00:04,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 11:00:04,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 11:00:04,065 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-20 11:00:04,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:04,066 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 11:00:04,066 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 11:00:04,066 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 11:00:04,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-20 11:00:04,068 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:04,069 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:04,281 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:04,282 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:04,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:04,283 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-20 11:00:04,283 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:04,284 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1597837093] [2020-07-20 11:00:04,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:04,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:04,319 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 11:00:04,323 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:04,369 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-20 11:00:04,369 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:04,616 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:04,668 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:04,670 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:04,705 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-20 11:00:04,705 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1597837093] [2020-07-20 11:00:04,706 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:04,706 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 11:00:04,706 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [252440346] [2020-07-20 11:00:04,707 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 11:00:04,707 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:04,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 11:00:04,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 11:00:04,708 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-20 11:00:04,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:04,866 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-20 11:00:04,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 11:00:04,866 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-20 11:00:04,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:04,869 INFO L225 Difference]: With dead ends: 47 [2020-07-20 11:00:04,876 INFO L226 Difference]: Without dead ends: 43 [2020-07-20 11:00:04,877 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-20 11:00:04,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-20 11:00:04,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-20 11:00:04,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 11:00:04,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 11:00:04,902 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-20 11:00:04,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:04,905 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 11:00:04,905 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 11:00:04,905 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 11:00:04,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-20 11:00:04,907 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:04,907 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:05,122 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:05,123 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:05,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:05,124 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-20 11:00:05,124 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:05,125 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [873558661] [2020-07-20 11:00:05,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:05,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:05,166 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 11:00:05,169 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:05,237 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 79 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-20 11:00:05,238 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:05,688 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:05,798 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:05,799 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:05,864 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:05,866 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:05,917 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-20 11:00:05,917 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [873558661] [2020-07-20 11:00:05,917 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:05,917 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 11:00:05,918 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [273628358] [2020-07-20 11:00:05,919 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 11:00:05,919 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:05,919 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 11:00:05,920 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 11:00:05,920 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-20 11:00:06,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:06,124 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-20 11:00:06,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 11:00:06,124 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-20 11:00:06,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:06,127 INFO L225 Difference]: With dead ends: 52 [2020-07-20 11:00:06,127 INFO L226 Difference]: Without dead ends: 48 [2020-07-20 11:00:06,128 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 111 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-20 11:00:06,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-20 11:00:06,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-20 11:00:06,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 11:00:06,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-20 11:00:06,140 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-20 11:00:06,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:06,140 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-20 11:00:06,141 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 11:00:06,141 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-20 11:00:06,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-20 11:00:06,145 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:06,145 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:06,355 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:06,355 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:06,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:06,356 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-20 11:00:06,357 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:06,357 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1845645674] [2020-07-20 11:00:06,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:06,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:06,420 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 11:00:06,423 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:06,490 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-07-20 11:00:06,491 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:06,938 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:07,043 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:07,044 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:07,093 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:07,142 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 181 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-07-20 11:00:07,143 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1845645674] [2020-07-20 11:00:07,143 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:07,143 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 11:00:07,144 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [651389589] [2020-07-20 11:00:07,144 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 11:00:07,145 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:07,145 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 11:00:07,145 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 11:00:07,145 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 13 states. [2020-07-20 11:00:07,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:07,296 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-20 11:00:07,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 11:00:07,297 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 96 [2020-07-20 11:00:07,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:07,299 INFO L225 Difference]: With dead ends: 57 [2020-07-20 11:00:07,299 INFO L226 Difference]: Without dead ends: 53 [2020-07-20 11:00:07,301 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 172 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-20 11:00:07,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-20 11:00:07,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-20 11:00:07,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 11:00:07,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-20 11:00:07,325 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-20 11:00:07,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:07,326 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-20 11:00:07,326 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 11:00:07,326 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-20 11:00:07,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-20 11:00:07,328 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:07,329 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:07,542 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:07,542 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:07,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:07,543 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-20 11:00:07,543 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:07,544 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1717629065] [2020-07-20 11:00:07,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:07,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:07,618 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 11:00:07,632 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:07,734 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 244 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2020-07-20 11:00:07,735 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:08,338 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:08,339 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:08,534 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:08,624 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:08,682 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:08,734 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 266 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-20 11:00:08,734 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1717629065] [2020-07-20 11:00:08,734 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:08,735 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-20 11:00:08,735 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1945269223] [2020-07-20 11:00:08,735 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 11:00:08,736 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:08,736 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 11:00:08,736 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-20 11:00:08,737 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 15 states. [2020-07-20 11:00:09,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:09,041 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-20 11:00:09,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 11:00:09,042 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 117 [2020-07-20 11:00:09,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:09,044 INFO L225 Difference]: With dead ends: 62 [2020-07-20 11:00:09,045 INFO L226 Difference]: Without dead ends: 58 [2020-07-20 11:00:09,046 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 211 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-20 11:00:09,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-20 11:00:09,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-20 11:00:09,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-20 11:00:09,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-20 11:00:09,059 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-20 11:00:09,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:09,059 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-20 11:00:09,060 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 11:00:09,060 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-20 11:00:09,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-20 11:00:09,063 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:09,063 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 21, 13, 13, 13, 13, 13, 13, 13, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:09,277 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:09,278 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:09,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:09,278 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-20 11:00:09,279 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:09,279 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [249352505] [2020-07-20 11:00:09,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:09,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:09,373 INFO L263 TraceCheckSpWp]: Trace formula consists of 424 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 11:00:09,378 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:09,485 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 506 refuted. 0 times theorem prover too weak. 1334 trivial. 0 not checked. [2020-07-20 11:00:09,485 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:10,222 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:10,426 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:10,509 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:10,511 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:10,563 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:10,564 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:10,615 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 532 refuted. 0 times theorem prover too weak. 1308 trivial. 0 not checked. [2020-07-20 11:00:10,615 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [249352505] [2020-07-20 11:00:10,616 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:10,616 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-20 11:00:10,616 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1860498814] [2020-07-20 11:00:10,617 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 11:00:10,617 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:10,617 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 11:00:10,617 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-20 11:00:10,618 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 15 states. [2020-07-20 11:00:10,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:10,798 INFO L93 Difference]: Finished difference Result 67 states and 168 transitions. [2020-07-20 11:00:10,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 11:00:10,799 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 190 [2020-07-20 11:00:10,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:10,805 INFO L225 Difference]: With dead ends: 67 [2020-07-20 11:00:10,805 INFO L226 Difference]: Without dead ends: 63 [2020-07-20 11:00:10,806 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 356 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-20 11:00:10,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-20 11:00:10,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 41. [2020-07-20 11:00:10,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-20 11:00:10,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-20 11:00:10,831 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 190 [2020-07-20 11:00:10,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:10,833 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-20 11:00:10,833 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 11:00:10,833 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-20 11:00:10,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-20 11:00:10,838 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:10,840 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 22, 21, 21, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:11,054 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:11,055 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:11,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:11,056 INFO L82 PathProgramCache]: Analyzing trace with hash -1082984306, now seen corresponding path program 5 times [2020-07-20 11:00:11,056 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:11,057 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [472768612] [2020-07-20 11:00:11,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:11,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:11,182 INFO L263 TraceCheckSpWp]: Trace formula consists of 640 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 11:00:11,188 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:11,322 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 967 refuted. 0 times theorem prover too weak. 3536 trivial. 0 not checked. [2020-07-20 11:00:11,322 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:12,555 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:12,887 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:13,049 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:13,137 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:13,189 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:13,190 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:13,312 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 1002 refuted. 0 times theorem prover too weak. 3501 trivial. 0 not checked. [2020-07-20 11:00:13,313 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [472768612] [2020-07-20 11:00:13,313 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:13,314 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-20 11:00:13,314 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1795120367] [2020-07-20 11:00:13,317 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 11:00:13,318 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:13,318 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 11:00:13,324 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-20 11:00:13,324 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 17 states. [2020-07-20 11:00:13,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:13,544 INFO L93 Difference]: Finished difference Result 72 states and 194 transitions. [2020-07-20 11:00:13,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 11:00:13,544 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 286 [2020-07-20 11:00:13,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:13,548 INFO L225 Difference]: With dead ends: 72 [2020-07-20 11:00:13,548 INFO L226 Difference]: Without dead ends: 68 [2020-07-20 11:00:13,549 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 545 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-20 11:00:13,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-07-20 11:00:13,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-07-20 11:00:13,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 11:00:13,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-20 11:00:13,562 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 286 [2020-07-20 11:00:13,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:13,563 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-20 11:00:13,563 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 11:00:13,563 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-20 11:00:13,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 301 [2020-07-20 11:00:13,568 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:13,569 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 35, 21, 21, 21, 21, 21, 21, 21, 14, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:13,781 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:13,782 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:13,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:13,783 INFO L82 PathProgramCache]: Analyzing trace with hash -1101007572, now seen corresponding path program 5 times [2020-07-20 11:00:13,783 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:13,784 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [529460399] [2020-07-20 11:00:13,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:13,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:13,911 INFO L263 TraceCheckSpWp]: Trace formula consists of 668 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 11:00:13,917 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:14,031 INFO L134 CoverageAnalysis]: Checked inductivity of 5047 backedges. 159 proven. 1061 refuted. 0 times theorem prover too weak. 3827 trivial. 0 not checked. [2020-07-20 11:00:14,031 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:15,342 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:15,669 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:15,823 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:15,914 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:15,915 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:15,964 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:16,040 INFO L134 CoverageAnalysis]: Checked inductivity of 5047 backedges. 159 proven. 1101 refuted. 0 times theorem prover too weak. 3787 trivial. 0 not checked. [2020-07-20 11:00:16,041 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [529460399] [2020-07-20 11:00:16,041 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:16,041 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-20 11:00:16,041 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1015168114] [2020-07-20 11:00:16,042 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 11:00:16,042 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:16,042 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 11:00:16,043 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-20 11:00:16,043 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 17 states. [2020-07-20 11:00:16,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:16,302 INFO L93 Difference]: Finished difference Result 77 states and 222 transitions. [2020-07-20 11:00:16,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 11:00:16,303 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 300 [2020-07-20 11:00:16,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:16,306 INFO L225 Difference]: With dead ends: 77 [2020-07-20 11:00:16,306 INFO L226 Difference]: Without dead ends: 73 [2020-07-20 11:00:16,307 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 605 GetRequests, 572 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-20 11:00:16,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-20 11:00:16,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 46. [2020-07-20 11:00:16,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 11:00:16,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-20 11:00:16,325 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 300 [2020-07-20 11:00:16,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:16,326 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-20 11:00:16,326 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 11:00:16,326 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-20 11:00:16,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 469 [2020-07-20 11:00:16,332 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:16,332 INFO L422 BasicCegarLoop]: trace histogram [71, 71, 36, 35, 35, 35, 35, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:16,545 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:16,546 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:16,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:16,547 INFO L82 PathProgramCache]: Analyzing trace with hash -897924696, now seen corresponding path program 6 times [2020-07-20 11:00:16,547 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:16,547 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1252966689] [2020-07-20 11:00:16,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:16,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:16,746 INFO L263 TraceCheckSpWp]: Trace formula consists of 1046 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 11:00:16,754 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:16,951 INFO L134 CoverageAnalysis]: Checked inductivity of 12915 backedges. 306 proven. 1995 refuted. 0 times theorem prover too weak. 10614 trivial. 0 not checked. [2020-07-20 11:00:16,952 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:18,940 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:19,489 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:19,767 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:19,955 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:19,956 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:20,044 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:20,102 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:20,103 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:20,249 INFO L134 CoverageAnalysis]: Checked inductivity of 12915 backedges. 306 proven. 2046 refuted. 0 times theorem prover too weak. 10563 trivial. 0 not checked. [2020-07-20 11:00:20,249 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1252966689] [2020-07-20 11:00:20,249 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:20,249 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-20 11:00:20,250 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [248582382] [2020-07-20 11:00:20,250 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 11:00:20,251 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:20,251 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 11:00:20,251 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-20 11:00:20,251 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 19 states. [2020-07-20 11:00:20,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:20,601 INFO L93 Difference]: Finished difference Result 82 states and 252 transitions. [2020-07-20 11:00:20,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 11:00:20,602 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 468 [2020-07-20 11:00:20,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:20,606 INFO L225 Difference]: With dead ends: 82 [2020-07-20 11:00:20,606 INFO L226 Difference]: Without dead ends: 78 [2020-07-20 11:00:20,607 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 943 GetRequests, 905 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-20 11:00:20,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-20 11:00:20,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 51. [2020-07-20 11:00:20,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-20 11:00:20,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-20 11:00:20,620 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 468 [2020-07-20 11:00:20,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:20,621 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-20 11:00:20,621 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 11:00:20,621 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-20 11:00:20,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2020-07-20 11:00:20,625 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:20,625 INFO L422 BasicCegarLoop]: trace histogram [65, 65, 53, 32, 32, 32, 32, 32, 32, 32, 21, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:20,838 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:20,839 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:20,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:20,840 INFO L82 PathProgramCache]: Analyzing trace with hash -1350718391, now seen corresponding path program 6 times [2020-07-20 11:00:20,840 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:20,840 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1554804840] [2020-07-20 11:00:20,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:21,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:21,053 INFO L263 TraceCheckSpWp]: Trace formula consists of 1001 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 11:00:21,060 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:21,260 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1918 refuted. 0 times theorem prover too weak. 9431 trivial. 0 not checked. [2020-07-20 11:00:21,261 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:23,007 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:23,667 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:23,668 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:24,006 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:24,010 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:24,176 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:24,266 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:24,270 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:24,317 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:24,460 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1975 refuted. 0 times theorem prover too weak. 9374 trivial. 0 not checked. [2020-07-20 11:00:24,461 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1554804840] [2020-07-20 11:00:24,461 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:24,462 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-20 11:00:24,462 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1073971485] [2020-07-20 11:00:24,463 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 11:00:24,463 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:24,463 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 11:00:24,464 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-20 11:00:24,464 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 19 states. [2020-07-20 11:00:24,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:24,985 INFO L93 Difference]: Finished difference Result 87 states and 284 transitions. [2020-07-20 11:00:24,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 11:00:24,986 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 450 [2020-07-20 11:00:24,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:24,992 INFO L225 Difference]: With dead ends: 87 [2020-07-20 11:00:24,993 INFO L226 Difference]: Without dead ends: 83 [2020-07-20 11:00:24,996 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 906 GetRequests, 868 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-20 11:00:24,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-07-20 11:00:25,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 51. [2020-07-20 11:00:25,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-20 11:00:25,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-20 11:00:25,027 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 450 [2020-07-20 11:00:25,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:25,029 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-20 11:00:25,029 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 11:00:25,029 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-20 11:00:25,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 872 [2020-07-20 11:00:25,042 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:25,043 INFO L422 BasicCegarLoop]: trace histogram [133, 133, 67, 66, 66, 66, 66, 66, 66, 66, 66, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:25,256 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:25,257 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:25,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:25,258 INFO L82 PathProgramCache]: Analyzing trace with hash -1701713687, now seen corresponding path program 7 times [2020-07-20 11:00:25,258 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:25,258 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [190108669] [2020-07-20 11:00:25,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:25,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:25,588 INFO L263 TraceCheckSpWp]: Trace formula consists of 1945 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 11:00:25,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:26,144 INFO L134 CoverageAnalysis]: Checked inductivity of 45837 backedges. 778 proven. 4406 refuted. 0 times theorem prover too weak. 40653 trivial. 0 not checked. [2020-07-20 11:00:26,145 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:29,132 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:29,133 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:30,575 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:31,254 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:31,254 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:31,635 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:31,636 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:31,800 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:31,801 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:31,892 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:31,893 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:31,942 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:32,303 INFO L134 CoverageAnalysis]: Checked inductivity of 45837 backedges. 778 proven. 4476 refuted. 0 times theorem prover too weak. 40583 trivial. 0 not checked. [2020-07-20 11:00:32,303 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [190108669] [2020-07-20 11:00:32,303 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:32,304 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-20 11:00:32,304 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2144443662] [2020-07-20 11:00:32,306 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 11:00:32,306 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:32,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 11:00:32,307 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-20 11:00:32,307 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 21 states. [2020-07-20 11:00:32,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:32,722 INFO L93 Difference]: Finished difference Result 92 states and 318 transitions. [2020-07-20 11:00:32,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 11:00:32,723 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 871 [2020-07-20 11:00:32,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:32,728 INFO L225 Difference]: With dead ends: 92 [2020-07-20 11:00:32,729 INFO L226 Difference]: Without dead ends: 88 [2020-07-20 11:00:32,734 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1750 GetRequests, 1707 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-20 11:00:32,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-20 11:00:32,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 56. [2020-07-20 11:00:32,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 11:00:32,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-20 11:00:32,762 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 871 [2020-07-20 11:00:32,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:32,765 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-20 11:00:32,765 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 11:00:32,765 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-20 11:00:32,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1078 [2020-07-20 11:00:32,776 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:32,777 INFO L422 BasicCegarLoop]: trace histogram [157, 157, 128, 78, 78, 78, 78, 78, 78, 78, 50, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:32,991 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:32,992 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:32,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:32,993 INFO L82 PathProgramCache]: Analyzing trace with hash 860290653, now seen corresponding path program 7 times [2020-07-20 11:00:32,993 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:32,994 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [444241070] [2020-07-20 11:00:32,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:33,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:33,448 INFO L263 TraceCheckSpWp]: Trace formula consists of 2393 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 11:00:33,462 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:33,964 INFO L134 CoverageAnalysis]: Checked inductivity of 69124 backedges. 831 proven. 5812 refuted. 0 times theorem prover too weak. 62481 trivial. 0 not checked. [2020-07-20 11:00:33,964 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:37,567 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:37,568 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:38,818 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:39,454 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:39,455 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:39,832 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:39,833 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:40,038 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:40,161 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:40,228 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:41,011 INFO L134 CoverageAnalysis]: Checked inductivity of 69124 backedges. 831 proven. 5889 refuted. 0 times theorem prover too weak. 62404 trivial. 0 not checked. [2020-07-20 11:00:41,012 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [444241070] [2020-07-20 11:00:41,012 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:41,013 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-20 11:00:41,013 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [92344117] [2020-07-20 11:00:41,014 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 11:00:41,015 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:41,015 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 11:00:41,015 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-20 11:00:41,015 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 21 states. [2020-07-20 11:00:41,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:41,560 INFO L93 Difference]: Finished difference Result 97 states and 354 transitions. [2020-07-20 11:00:41,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 11:00:41,561 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1077 [2020-07-20 11:00:41,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:41,566 INFO L225 Difference]: With dead ends: 97 [2020-07-20 11:00:41,566 INFO L226 Difference]: Without dead ends: 93 [2020-07-20 11:00:41,567 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2161 GetRequests, 2118 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-20 11:00:41,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-20 11:00:41,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 56. [2020-07-20 11:00:41,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 11:00:41,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-20 11:00:41,583 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 1077 [2020-07-20 11:00:41,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:41,585 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-20 11:00:41,585 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 11:00:41,585 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-20 11:00:41,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1574 [2020-07-20 11:00:41,606 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:41,607 INFO L422 BasicCegarLoop]: trace histogram [241, 241, 121, 120, 120, 120, 120, 120, 120, 120, 120, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:41,821 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:41,822 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:41,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:41,823 INFO L82 PathProgramCache]: Analyzing trace with hash 78333505, now seen corresponding path program 8 times [2020-07-20 11:00:41,824 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:41,824 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [381977780] [2020-07-20 11:00:41,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:42,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:42,430 INFO L263 TraceCheckSpWp]: Trace formula consists of 3511 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 11:00:42,447 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:43,396 INFO L134 CoverageAnalysis]: Checked inductivity of 151380 backedges. 1563 proven. 9337 refuted. 0 times theorem prover too weak. 140480 trivial. 0 not checked. [2020-07-20 11:00:43,396 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:48,272 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:50,520 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:51,761 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:52,301 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:52,302 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:52,688 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:52,688 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:52,917 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:53,020 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:53,021 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:53,075 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:53,077 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:53,981 INFO L134 CoverageAnalysis]: Checked inductivity of 151380 backedges. 1563 proven. 9429 refuted. 0 times theorem prover too weak. 140388 trivial. 0 not checked. [2020-07-20 11:00:53,982 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [381977780] [2020-07-20 11:00:53,982 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:53,982 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-20 11:00:53,983 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [950782433] [2020-07-20 11:00:53,984 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 11:00:53,984 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:53,984 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 11:00:53,985 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-20 11:00:53,985 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 23 states. [2020-07-20 11:00:54,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:54,756 INFO L93 Difference]: Finished difference Result 102 states and 392 transitions. [2020-07-20 11:00:54,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 11:00:54,757 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1573 [2020-07-20 11:00:54,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:54,763 INFO L225 Difference]: With dead ends: 102 [2020-07-20 11:00:54,763 INFO L226 Difference]: Without dead ends: 98 [2020-07-20 11:00:54,765 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3155 GetRequests, 3107 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-20 11:00:54,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-20 11:00:54,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 61. [2020-07-20 11:00:54,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 11:00:54,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-20 11:00:54,779 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1573 [2020-07-20 11:00:54,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:54,781 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-20 11:00:54,781 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 11:00:54,781 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-20 11:00:54,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1843 [2020-07-20 11:00:54,820 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:54,821 INFO L422 BasicCegarLoop]: trace histogram [269, 269, 221, 134, 134, 134, 134, 134, 134, 134, 87, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:55,033 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:55,034 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:55,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:55,035 INFO L82 PathProgramCache]: Analyzing trace with hash -323852785, now seen corresponding path program 8 times [2020-07-20 11:00:55,035 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:55,035 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2091914851] [2020-07-20 11:00:55,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:55,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:55,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 4091 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 11:00:55,664 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:56,918 INFO L134 CoverageAnalysis]: Checked inductivity of 204138 backedges. 1703 proven. 11413 refuted. 0 times theorem prover too weak. 191022 trivial. 0 not checked. [2020-07-20 11:00:56,918 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:01:02,217 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:04,967 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:04,968 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:06,428 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:06,429 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:07,091 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:07,445 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:07,445 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:07,612 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:07,707 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:07,767 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:08,943 INFO L134 CoverageAnalysis]: Checked inductivity of 204138 backedges. 1703 proven. 11513 refuted. 0 times theorem prover too weak. 190922 trivial. 0 not checked. [2020-07-20 11:01:08,943 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2091914851] [2020-07-20 11:01:08,943 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:01:08,944 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-20 11:01:08,944 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1147086659] [2020-07-20 11:01:08,946 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 11:01:08,946 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:01:08,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 11:01:08,947 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-20 11:01:08,947 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 23 states. [2020-07-20 11:01:09,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:01:09,454 INFO L93 Difference]: Finished difference Result 107 states and 432 transitions. [2020-07-20 11:01:09,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 11:01:09,455 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1842 [2020-07-20 11:01:09,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:01:09,460 INFO L225 Difference]: With dead ends: 107 [2020-07-20 11:01:09,461 INFO L226 Difference]: Without dead ends: 103 [2020-07-20 11:01:09,462 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3692 GetRequests, 3644 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-20 11:01:09,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-20 11:01:09,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 61. [2020-07-20 11:01:09,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 11:01:09,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-20 11:01:09,481 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1842 [2020-07-20 11:01:09,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:01:09,482 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-20 11:01:09,482 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 11:01:09,482 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-20 11:01:09,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2107 [2020-07-20 11:01:09,514 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:01:09,515 INFO L422 BasicCegarLoop]: trace histogram [323, 323, 162, 161, 161, 161, 161, 161, 161, 161, 161, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:01:09,730 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:09,731 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:01:09,731 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:01:09,733 INFO L82 PathProgramCache]: Analyzing trace with hash 211951896, now seen corresponding path program 9 times [2020-07-20 11:01:09,733 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:01:09,733 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [197516466] [2020-07-20 11:01:09,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:10,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:01:10,524 INFO L263 TraceCheckSpWp]: Trace formula consists of 4700 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 11:01:10,542 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:01:13,252 INFO L134 CoverageAnalysis]: Checked inductivity of 272412 backedges. 2152 proven. 14276 refuted. 0 times theorem prover too weak. 255984 trivial. 0 not checked. [2020-07-20 11:01:13,252 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:01:19,981 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:23,671 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:25,543 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:26,442 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:26,442 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:27,007 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:27,008 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:27,376 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:27,377 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:27,553 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:27,647 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:27,701 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:29,177 INFO L134 CoverageAnalysis]: Checked inductivity of 272412 backedges. 2152 proven. 14393 refuted. 0 times theorem prover too weak. 255867 trivial. 0 not checked. [2020-07-20 11:01:29,178 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [197516466] [2020-07-20 11:01:29,178 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:01:29,178 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-20 11:01:29,179 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2042620210] [2020-07-20 11:01:29,180 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 11:01:29,180 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:01:29,180 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 11:01:29,181 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-20 11:01:29,181 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 25 states. [2020-07-20 11:01:29,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:01:29,859 INFO L93 Difference]: Finished difference Result 112 states and 474 transitions. [2020-07-20 11:01:29,860 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 11:01:29,860 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2106 [2020-07-20 11:01:29,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:01:29,866 INFO L225 Difference]: With dead ends: 112 [2020-07-20 11:01:29,867 INFO L226 Difference]: Without dead ends: 108 [2020-07-20 11:01:29,868 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4222 GetRequests, 4169 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 11:01:29,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-20 11:01:29,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 66. [2020-07-20 11:01:29,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-20 11:01:29,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-20 11:01:29,885 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2106 [2020-07-20 11:01:29,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:01:29,886 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-20 11:01:29,887 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 11:01:29,887 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-20 11:01:29,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2206 [2020-07-20 11:01:29,937 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:01:29,938 INFO L422 BasicCegarLoop]: trace histogram [323, 323, 260, 161, 161, 161, 161, 161, 161, 161, 99, 63, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:01:30,153 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:30,154 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:01:30,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:01:30,154 INFO L82 PathProgramCache]: Analyzing trace with hash -576304576, now seen corresponding path program 9 times [2020-07-20 11:01:30,155 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:01:30,155 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2032669938] [2020-07-20 11:01:30,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:31,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:01:31,015 INFO L263 TraceCheckSpWp]: Trace formula consists of 4898 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 11:01:31,037 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:01:32,773 INFO L134 CoverageAnalysis]: Checked inductivity of 293202 backedges. 2131 proven. 15429 refuted. 0 times theorem prover too weak. 275642 trivial. 0 not checked. [2020-07-20 11:01:32,773 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:01:39,852 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:43,623 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:45,642 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:45,643 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:46,525 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:47,179 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:47,485 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:47,693 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:47,797 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:47,797 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:47,853 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:47,854 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:49,446 INFO L134 CoverageAnalysis]: Checked inductivity of 293202 backedges. 2131 proven. 15555 refuted. 0 times theorem prover too weak. 275516 trivial. 0 not checked. [2020-07-20 11:01:49,447 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2032669938] [2020-07-20 11:01:49,447 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:01:49,449 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-20 11:01:49,449 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [214941886] [2020-07-20 11:01:49,452 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 11:01:49,452 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:01:49,452 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 11:01:49,453 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-20 11:01:49,453 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 25 states. [2020-07-20 11:01:50,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:01:50,214 INFO L93 Difference]: Finished difference Result 117 states and 518 transitions. [2020-07-20 11:01:50,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 11:01:50,215 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2205 [2020-07-20 11:01:50,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:01:50,221 INFO L225 Difference]: With dead ends: 117 [2020-07-20 11:01:50,221 INFO L226 Difference]: Without dead ends: 113 [2020-07-20 11:01:50,223 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4419 GetRequests, 4366 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 11:01:50,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2020-07-20 11:01:50,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 66. [2020-07-20 11:01:50,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-20 11:01:50,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-20 11:01:50,242 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2205 [2020-07-20 11:01:50,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:01:50,244 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-20 11:01:50,244 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 11:01:50,244 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-20 11:01:50,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4434 [2020-07-20 11:01:50,355 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:01:50,356 INFO L422 BasicCegarLoop]: trace histogram [681, 681, 341, 340, 340, 340, 340, 340, 340, 340, 340, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:01:50,557 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:50,557 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:01:50,558 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:01:50,560 INFO L82 PathProgramCache]: Analyzing trace with hash 1507680547, now seen corresponding path program 10 times [2020-07-20 11:01:50,560 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:01:50,560 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [58012836] [2020-07-20 11:01:50,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:52,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:01:52,111 INFO L263 TraceCheckSpWp]: Trace formula consists of 9891 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 11:01:52,145 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:01:58,700 INFO L134 CoverageAnalysis]: Checked inductivity of 1214310 backedges. 4455 proven. 34400 refuted. 0 times theorem prover too weak. 1175455 trivial. 0 not checked. [2020-07-20 11:01:58,700 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:02:15,088 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:15,089 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:23,061 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:26,537 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:28,292 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:29,975 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:30,611 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:30,612 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:31,046 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:31,257 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:31,375 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:31,439 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:37,390 INFO L134 CoverageAnalysis]: Checked inductivity of 1214310 backedges. 4455 proven. 34545 refuted. 0 times theorem prover too weak. 1175310 trivial. 0 not checked. [2020-07-20 11:02:37,391 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [58012836] [2020-07-20 11:02:37,391 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:02:37,392 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-20 11:02:37,392 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2135271044] [2020-07-20 11:02:37,395 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 11:02:37,395 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:02:37,395 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 11:02:37,396 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-20 11:02:37,396 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 27 states. [2020-07-20 11:02:38,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:02:38,574 INFO L93 Difference]: Finished difference Result 122 states and 564 transitions. [2020-07-20 11:02:38,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 11:02:38,578 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 4433 [2020-07-20 11:02:38,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:02:38,586 INFO L225 Difference]: With dead ends: 122 [2020-07-20 11:02:38,586 INFO L226 Difference]: Without dead ends: 118 [2020-07-20 11:02:38,588 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8877 GetRequests, 8819 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 11:02:38,588 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-20 11:02:38,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 71. [2020-07-20 11:02:38,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-20 11:02:38,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-20 11:02:38,609 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 4433 [2020-07-20 11:02:38,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:02:38,613 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-20 11:02:38,613 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 11:02:38,613 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-20 11:02:39,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8141 [2020-07-20 11:02:39,152 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:02:39,155 INFO L422 BasicCegarLoop]: trace histogram [1199, 1199, 939, 599, 599, 599, 599, 599, 599, 599, 340, 260, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:02:39,355 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:02:39,356 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:02:39,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:02:39,359 INFO L82 PathProgramCache]: Analyzing trace with hash 1642038220, now seen corresponding path program 10 times [2020-07-20 11:02:39,359 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:02:39,359 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1243557568] [2020-07-20 11:02:39,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:02:42,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:02:42,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 18082 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 11:02:42,192 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:03:01,508 INFO L134 CoverageAnalysis]: Checked inductivity of 4029599 backedges. 7276 proven. 65941 refuted. 0 times theorem prover too weak. 3956382 trivial. 0 not checked. [2020-07-20 11:03:01,509 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:03:36,814 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:51,249 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:51,250 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:57,079 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:57,080 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:00,220 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:00,221 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:03,026 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:03,027 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:04,309 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:04,310 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:04,963 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:05,294 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:05,294 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:05,427 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:05,427 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:05,500 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:24,974 INFO L134 CoverageAnalysis]: Checked inductivity of 4029599 backedges. 7276 proven. 66096 refuted. 0 times theorem prover too weak. 3956227 trivial. 0 not checked. [2020-07-20 11:04:24,975 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1243557568] [2020-07-20 11:04:24,975 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:04:24,978 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-20 11:04:24,978 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1902005236] [2020-07-20 11:04:24,984 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 11:04:24,984 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:04:24,985 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 11:04:24,985 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-20 11:04:24,985 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 27 states. [2020-07-20 11:04:26,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:04:26,494 INFO L93 Difference]: Finished difference Result 127 states and 612 transitions. [2020-07-20 11:04:26,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 11:04:26,498 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 8140 [2020-07-20 11:04:26,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:04:26,507 INFO L225 Difference]: With dead ends: 127 [2020-07-20 11:04:26,507 INFO L226 Difference]: Without dead ends: 123 [2020-07-20 11:04:26,508 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16290 GetRequests, 16232 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 11:04:26,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2020-07-20 11:04:26,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 71. [2020-07-20 11:04:26,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-20 11:04:26,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-20 11:04:26,531 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 8140 [2020-07-20 11:04:26,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:04:26,537 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-20 11:04:26,537 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 11:04:26,537 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-20 11:04:27,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11129 [2020-07-20 11:04:27,179 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:04:27,183 INFO L422 BasicCegarLoop]: trace histogram [1711, 1711, 856, 855, 855, 855, 855, 855, 855, 855, 855, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:04:27,383 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:04:27,384 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:04:27,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:04:27,388 INFO L82 PathProgramCache]: Analyzing trace with hash -434172532, now seen corresponding path program 11 times [2020-07-20 11:04:27,388 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:04:27,388 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [951107115] [2020-07-20 11:04:27,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:04:32,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:04:32,214 INFO L263 TraceCheckSpWp]: Trace formula consists of 24826 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 11:04:32,297 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:05:08,950 INFO L134 CoverageAnalysis]: Checked inductivity of 7677045 backedges. 10309 proven. 97572 refuted. 0 times theorem prover too weak. 7569164 trivial. 0 not checked. [2020-07-20 11:05:08,950 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:05:21,034 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-20 11:06:10,734 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 11:06:10,939 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 11:06:11,837 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:38,242 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 11:06:39,018 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:49,809 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:49,810 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:57,776 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:57,777 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:00,975 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:03,495 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:03,496 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:04,603 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:04,604 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:05,385 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:05,830 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:05,831 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:06,029 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:06,152 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:45,117 INFO L134 CoverageAnalysis]: Checked inductivity of 7677045 backedges. 10309 proven. 97748 refuted. 0 times theorem prover too weak. 7568988 trivial. 0 not checked. [2020-07-20 11:07:45,118 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [951107115] [2020-07-20 11:07:45,118 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:07:45,121 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-20 11:07:45,121 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1081849356] [2020-07-20 11:07:45,129 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 11:07:45,130 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:07:45,130 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 11:07:45,131 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-20 11:07:45,131 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 29 states. [2020-07-20 11:07:46,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:07:46,870 INFO L93 Difference]: Finished difference Result 132 states and 662 transitions. [2020-07-20 11:07:46,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 11:07:46,872 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 11128 [2020-07-20 11:07:46,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:07:46,886 INFO L225 Difference]: With dead ends: 132 [2020-07-20 11:07:46,886 INFO L226 Difference]: Without dead ends: 128 [2020-07-20 11:07:46,888 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22268 GetRequests, 22205 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-20 11:07:46,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-07-20 11:07:46,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 76. [2020-07-20 11:07:46,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-20 11:07:46,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-20 11:07:46,916 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 11128 [2020-07-20 11:07:46,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:07:46,923 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-20 11:07:46,923 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 11:07:46,923 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-20 11:07:47,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9939 [2020-07-20 11:07:47,904 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:07:47,911 INFO L422 BasicCegarLoop]: trace histogram [1459, 1459, 1177, 729, 729, 729, 729, 729, 729, 729, 448, 282, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:07:48,126 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:07:48,127 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:07:48,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:07:48,132 INFO L82 PathProgramCache]: Analyzing trace with hash -1208289302, now seen corresponding path program 11 times [2020-07-20 11:07:48,132 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:07:48,133 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [993020980] [2020-07-20 11:07:48,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:07:51,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:07:51,863 INFO L263 TraceCheckSpWp]: Trace formula consists of 22068 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 11:07:51,945 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:08:26,406 INFO L134 CoverageAnalysis]: Checked inductivity of 6007944 backedges. 8741 proven. 89220 refuted. 0 times theorem prover too weak. 5909983 trivial. 0 not checked. [2020-07-20 11:08:26,406 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:08:33,782 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 11:08:33,890 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 11:08:34,021 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 11:08:34,134 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 11:08:39,784 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 11:08:39,902 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 11:08:40,022 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-20 11:08:40,146 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-20 11:08:40,262 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2020-07-20 11:08:40,366 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 81 [2020-07-20 11:08:40,470 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2020-07-20 11:09:38,298 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 11:09:41,592 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 11:09:41,700 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 11:09:41,817 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 11:09:41,946 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 11:09:42,072 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-20 11:09:42,176 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-20 11:09:42,285 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-20 11:09:42,390 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 11:09:43,077 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:09:43,078 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:13,306 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 11:10:13,411 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 11:10:14,779 WARN L193 SmtUtils]: Spent 1.37 s on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 11:10:14,885 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 11:10:14,992 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-20 11:10:15,095 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 11:10:15,801 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:27,173 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 11:10:27,938 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:27,939 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:36,131 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 11:10:36,593 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:36,594 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:39,961 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:39,962 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:42,798 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:42,799 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:44,192 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:45,154 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:45,607 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:45,607 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:45,876 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:45,877 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:46,031 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:18,436 INFO L134 CoverageAnalysis]: Checked inductivity of 6007944 backedges. 8741 proven. 89407 refuted. 0 times theorem prover too weak. 5909796 trivial. 0 not checked. [2020-07-20 11:11:18,436 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [993020980] [2020-07-20 11:11:18,436 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:11:18,439 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-20 11:11:18,439 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1885362033] [2020-07-20 11:11:18,442 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 11:11:18,443 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:11:18,443 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 11:11:18,444 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-20 11:11:18,444 INFO L87 Difference]: Start difference. First operand 76 states and 234 transitions. Second operand 29 states. [2020-07-20 11:11:21,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:11:21,325 INFO L93 Difference]: Finished difference Result 137 states and 714 transitions. [2020-07-20 11:11:21,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 11:11:21,329 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 9938 [2020-07-20 11:11:21,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:11:21,342 INFO L225 Difference]: With dead ends: 137 [2020-07-20 11:11:21,342 INFO L226 Difference]: Without dead ends: 133 [2020-07-20 11:11:21,345 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19887 GetRequests, 19824 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-20 11:11:21,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-07-20 11:11:21,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 76. [2020-07-20 11:11:21,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-20 11:11:21,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-20 11:11:21,376 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 9938 [2020-07-20 11:11:21,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:11:21,382 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-20 11:11:21,382 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 11:11:21,382 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-20 11:11:22,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8971 [2020-07-20 11:11:22,283 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:11:22,289 INFO L422 BasicCegarLoop]: trace histogram [1379, 1379, 690, 689, 689, 689, 689, 689, 689, 689, 689, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:11:22,503 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:11:22,503 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:11:22,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:11:22,507 INFO L82 PathProgramCache]: Analyzing trace with hash 1584963562, now seen corresponding path program 12 times [2020-07-20 11:11:22,508 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:11:22,508 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [503783547] [2020-07-20 11:11:22,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:11:26,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:11:26,180 INFO L263 TraceCheckSpWp]: Trace formula consists of 20012 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-20 11:11:26,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:11:53,571 INFO L134 CoverageAnalysis]: Checked inductivity of 4985604 backedges. 9211 proven. 85037 refuted. 0 times theorem prover too weak. 4891356 trivial. 0 not checked. [2020-07-20 11:11:53,572 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:11:58,157 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 11:11:58,260 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 11:11:59,652 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 11:11:59,774 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 11:11:59,900 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 11:12:02,730 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 11:12:02,874 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 11:12:03,026 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 11:12:03,179 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 11:12:10,193 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 11:12:10,352 WARN L193 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 11:12:10,508 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 11:12:10,656 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 11:12:10,807 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 91 [2020-07-20 11:12:10,958 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2020-07-20 11:12:11,108 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2020-07-20 11:12:11,247 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2020-07-20 11:12:11,383 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 76 [2020-07-20 11:12:11,503 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 73 [2020-07-20 11:12:11,607 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 11:12:12,145 WARN L193 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-20 11:13:09,388 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts