/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 SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/cggmp2005b.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 17:55:35,935 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 17:55:35,937 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 17:55:35,957 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 17:55:35,957 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 17:55:35,959 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 17:55:35,961 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 17:55:35,973 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 17:55:35,976 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 17:55:35,979 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 17:55:35,981 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 17:55:35,982 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 17:55:35,982 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 17:55:35,983 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 17:55:35,983 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 17:55:35,988 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 17:55:35,989 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 17:55:35,990 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 17:55:35,991 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 17:55:35,993 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 17:55:35,994 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 17:55:35,995 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 17:55:35,996 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 17:55:35,996 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 17:55:35,998 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 17:55:36,007 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 17:55:36,021 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 17:55:36,022 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 17:55:36,023 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 17:55:36,023 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 17:55:36,023 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 17:55:36,023 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 17:55:36,024 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 17:55:36,024 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 17:55:36,024 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 17:55:36,024 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 17:55:36,024 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 17:55:36,025 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 17:55:36,025 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 17:55:36,025 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 17:55:36,025 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 17:55:36,025 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 17:55:36,026 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 17:55:36,026 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 17:55:36,026 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 17:55:36,026 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 17:55:36,026 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 17:55:36,026 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 17:55:36,027 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 17:55:36,027 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 17:55:36,027 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 17:55:36,027 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 17:55:36,027 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:36,028 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 17:55:36,028 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 17:55:36,028 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 -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 17:55:36,313 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 17:55:36,332 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 17:55:36,336 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 17:55:36,337 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 17:55:36,340 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 17:55:36,341 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/cggmp2005b.i [2020-07-20 17:55:36,403 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/52927c190/2057686839de41dfa696384315efc055/FLAG3699a0683 [2020-07-20 17:55:36,793 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 17:55:36,793 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-lit/cggmp2005b.i [2020-07-20 17:55:36,799 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/52927c190/2057686839de41dfa696384315efc055/FLAG3699a0683 [2020-07-20 17:55:37,210 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/52927c190/2057686839de41dfa696384315efc055 [2020-07-20 17:55:37,221 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 17:55:37,224 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 17:55:37,225 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 17:55:37,225 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 17:55:37,229 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 17:55:37,230 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:55:37" (1/1) ... [2020-07-20 17:55:37,233 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@16460755 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:55:37, skipping insertion in model container [2020-07-20 17:55:37,233 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:55:37" (1/1) ... [2020-07-20 17:55:37,241 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 17:55:37,264 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 17:55:37,462 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:55:37,468 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 17:55:37,487 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:55:37,502 INFO L208 MainTranslator]: Completed translation [2020-07-20 17:55:37,503 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:55:37 WrapperNode [2020-07-20 17:55:37,504 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 17:55:37,505 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 17:55:37,505 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 17:55:37,505 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 17:55:37,522 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:55:37" (1/1) ... [2020-07-20 17:55:37,524 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:55:37" (1/1) ... [2020-07-20 17:55:37,530 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:55:37" (1/1) ... [2020-07-20 17:55:37,531 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:55:37" (1/1) ... [2020-07-20 17:55:37,534 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:55:37" (1/1) ... [2020-07-20 17:55:37,541 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:55:37" (1/1) ... [2020-07-20 17:55:37,542 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:55:37" (1/1) ... [2020-07-20 17:55:37,640 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 17:55:37,641 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 17:55:37,641 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 17:55:37,641 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 17:55:37,642 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:55:37" (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 17:55:37,712 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 17:55:37,712 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 17:55:37,712 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 17:55:37,712 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 17:55:37,713 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 17:55:37,713 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 17:55:37,713 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 17:55:37,713 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 17:55:37,713 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 17:55:37,713 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 17:55:37,714 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 17:55:37,714 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 17:55:37,714 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 17:55:37,895 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 17:55:37,897 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-07-20 17:55:37,900 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:55:37 BoogieIcfgContainer [2020-07-20 17:55:37,900 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 17:55:37,904 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 17:55:37,904 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 17:55:37,908 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 17:55:37,908 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 05:55:37" (1/3) ... [2020-07-20 17:55:37,909 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@143491c9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:55:37, skipping insertion in model container [2020-07-20 17:55:37,910 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:55:37" (2/3) ... [2020-07-20 17:55:37,910 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@143491c9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:55:37, skipping insertion in model container [2020-07-20 17:55:37,911 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:55:37" (3/3) ... [2020-07-20 17:55:37,912 INFO L109 eAbstractionObserver]: Analyzing ICFG cggmp2005b.i [2020-07-20 17:55:37,923 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 17:55:37,935 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 17:55:37,949 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 17:55:37,971 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 17:55:37,972 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 17:55:37,972 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 17:55:37,972 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 17:55:37,972 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 17:55:37,972 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 17:55:37,972 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 17:55:37,972 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 17:55:37,988 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-07-20 17:55:37,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-07-20 17:55:37,993 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:55:37,994 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:55:37,995 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:55:37,999 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:55:37,999 INFO L82 PathProgramCache]: Analyzing trace with hash -1039733575, now seen corresponding path program 1 times [2020-07-20 17:55:38,006 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:55:38,006 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [75540691] [2020-07-20 17:55:38,007 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 17:55:38,068 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:55:38,069 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:55:38,071 INFO L263 TraceCheckSpWp]: Trace formula consists of 25 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-20 17:55:38,077 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:55:38,102 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 17:55:38,102 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:55:38,103 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [75540691] [2020-07-20 17:55:38,104 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:55:38,104 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-20 17:55:38,106 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [628493644] [2020-07-20 17:55:38,111 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-20 17:55:38,112 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:55:38,129 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-20 17:55:38,130 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 17:55:38,133 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2020-07-20 17:55:38,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:55:38,196 INFO L93 Difference]: Finished difference Result 37 states and 50 transitions. [2020-07-20 17:55:38,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-20 17:55:38,198 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-07-20 17:55:38,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:55:38,211 INFO L225 Difference]: With dead ends: 37 [2020-07-20 17:55:38,211 INFO L226 Difference]: Without dead ends: 14 [2020-07-20 17:55:38,215 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 17:55:38,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-07-20 17:55:38,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-07-20 17:55:38,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-07-20 17:55:38,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2020-07-20 17:55:38,257 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 10 [2020-07-20 17:55:38,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:55:38,257 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2020-07-20 17:55:38,257 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-20 17:55:38,257 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2020-07-20 17:55:38,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-07-20 17:55:38,258 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:55:38,258 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:55:38,460 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:38,461 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:55:38,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:55:38,463 INFO L82 PathProgramCache]: Analyzing trace with hash -1066515684, now seen corresponding path program 1 times [2020-07-20 17:55:38,463 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:55:38,464 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1698286545] [2020-07-20 17:55:38,464 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 17:55:38,490 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:55:38,490 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:55:38,491 INFO L263 TraceCheckSpWp]: Trace formula consists of 25 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 17:55:38,493 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:55:38,530 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 17:55:38,531 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:55:38,531 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1698286545] [2020-07-20 17:55:38,531 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:55:38,532 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:55:38,532 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [44171932] [2020-07-20 17:55:38,533 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:55:38,534 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:55:38,534 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:55:38,535 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:55:38,535 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 3 states. [2020-07-20 17:55:38,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:55:38,552 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2020-07-20 17:55:38,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:55:38,552 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-07-20 17:55:38,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:55:38,554 INFO L225 Difference]: With dead ends: 20 [2020-07-20 17:55:38,554 INFO L226 Difference]: Without dead ends: 15 [2020-07-20 17:55:38,555 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:55:38,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-07-20 17:55:38,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-07-20 17:55:38,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-07-20 17:55:38,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-07-20 17:55:38,560 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 10 [2020-07-20 17:55:38,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:55:38,561 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-07-20 17:55:38,561 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:55:38,561 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-07-20 17:55:38,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 17:55:38,562 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:55:38,562 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:55:38,777 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:38,778 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:55:38,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:55:38,779 INFO L82 PathProgramCache]: Analyzing trace with hash 1875131310, now seen corresponding path program 1 times [2020-07-20 17:55:38,780 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:55:38,780 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [606680057] [2020-07-20 17:55:38,781 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 17:55:38,815 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:55:38,816 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:55:38,817 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 17:55:38,818 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:55:38,832 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:55:38,832 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:55:38,833 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [606680057] [2020-07-20 17:55:38,833 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:55:38,833 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:55:38,834 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [543544946] [2020-07-20 17:55:38,834 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:55:38,835 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:55:38,835 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:55:38,835 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:55:38,836 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-07-20 17:55:38,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:55:38,846 INFO L93 Difference]: Finished difference Result 25 states and 30 transitions. [2020-07-20 17:55:38,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:55:38,847 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2020-07-20 17:55:38,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:55:38,848 INFO L225 Difference]: With dead ends: 25 [2020-07-20 17:55:38,848 INFO L226 Difference]: Without dead ends: 16 [2020-07-20 17:55:38,852 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:55:38,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-07-20 17:55:38,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-07-20 17:55:38,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-07-20 17:55:38,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-07-20 17:55:38,857 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 14 [2020-07-20 17:55:38,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:55:38,857 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-07-20 17:55:38,858 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:55:38,858 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-07-20 17:55:38,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-20 17:55:38,859 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:55:38,859 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:55:39,073 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:39,075 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:55:39,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:55:39,076 INFO L82 PathProgramCache]: Analyzing trace with hash -224898986, now seen corresponding path program 1 times [2020-07-20 17:55:39,077 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:55:39,077 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1547586992] [2020-07-20 17:55:39,077 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 17:55:39,110 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:55:39,110 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:55:39,111 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 17:55:39,114 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:55:39,176 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:55:39,176 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:55:39,228 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:55:39,229 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1547586992] [2020-07-20 17:55:39,229 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:55:39,229 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2020-07-20 17:55:39,230 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [365817916] [2020-07-20 17:55:39,230 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 17:55:39,230 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:55:39,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 17:55:39,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2020-07-20 17:55:39,231 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 8 states. [2020-07-20 17:55:39,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:55:39,277 INFO L93 Difference]: Finished difference Result 27 states and 33 transitions. [2020-07-20 17:55:39,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 17:55:39,278 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2020-07-20 17:55:39,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:55:39,279 INFO L225 Difference]: With dead ends: 27 [2020-07-20 17:55:39,279 INFO L226 Difference]: Without dead ends: 18 [2020-07-20 17:55:39,280 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=32, Invalid=40, Unknown=0, NotChecked=0, Total=72 [2020-07-20 17:55:39,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-20 17:55:39,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-20 17:55:39,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-20 17:55:39,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-07-20 17:55:39,285 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 15 [2020-07-20 17:55:39,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:55:39,286 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-07-20 17:55:39,286 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 17:55:39,286 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-07-20 17:55:39,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-20 17:55:39,287 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:55:39,287 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:55:39,499 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:39,500 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:55:39,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:55:39,502 INFO L82 PathProgramCache]: Analyzing trace with hash -395814058, now seen corresponding path program 2 times [2020-07-20 17:55:39,502 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:55:39,503 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1256572118] [2020-07-20 17:55:39,503 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 17:55:39,531 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:55:39,531 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:55:39,532 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:55:39,533 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:55:39,554 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-20 17:55:39,554 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:55:39,580 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-20 17:55:39,581 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1256572118] [2020-07-20 17:55:39,581 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:55:39,581 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-07-20 17:55:39,582 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1630827865] [2020-07-20 17:55:39,582 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 17:55:39,582 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:55:39,583 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 17:55:39,583 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-20 17:55:39,583 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 6 states. [2020-07-20 17:55:39,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:55:39,616 INFO L93 Difference]: Finished difference Result 35 states and 45 transitions. [2020-07-20 17:55:39,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 17:55:39,617 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 17 [2020-07-20 17:55:39,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:55:39,618 INFO L225 Difference]: With dead ends: 35 [2020-07-20 17:55:39,618 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 17:55:39,619 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-20 17:55:39,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 17:55:39,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-20 17:55:39,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 17:55:39,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 38 transitions. [2020-07-20 17:55:39,627 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 38 transitions. Word has length 17 [2020-07-20 17:55:39,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:55:39,628 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 38 transitions. [2020-07-20 17:55:39,628 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 17:55:39,628 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 38 transitions. [2020-07-20 17:55:39,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-20 17:55:39,629 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:55:39,629 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:55:39,843 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:39,844 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:55:39,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:55:39,845 INFO L82 PathProgramCache]: Analyzing trace with hash -745377012, now seen corresponding path program 3 times [2020-07-20 17:55:39,845 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:55:39,846 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1165195078] [2020-07-20 17:55:39,846 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 17:55:39,890 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 17:55:39,890 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:55:39,891 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 17:55:39,893 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:55:39,998 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 16 proven. 6 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-20 17:55:39,998 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:55:40,089 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 16 proven. 6 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-20 17:55:40,090 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1165195078] [2020-07-20 17:55:40,090 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:55:40,090 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-20 17:55:40,091 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [254436321] [2020-07-20 17:55:40,091 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 17:55:40,091 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:55:40,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 17:55:40,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=84, Unknown=0, NotChecked=0, Total=132 [2020-07-20 17:55:40,092 INFO L87 Difference]: Start difference. First operand 30 states and 38 transitions. Second operand 12 states. [2020-07-20 17:55:40,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:55:40,262 INFO L93 Difference]: Finished difference Result 54 states and 73 transitions. [2020-07-20 17:55:40,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 17:55:40,263 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 29 [2020-07-20 17:55:40,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:55:40,264 INFO L225 Difference]: With dead ends: 54 [2020-07-20 17:55:40,264 INFO L226 Difference]: Without dead ends: 34 [2020-07-20 17:55:40,265 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=125, Invalid=181, Unknown=0, NotChecked=0, Total=306 [2020-07-20 17:55:40,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-07-20 17:55:40,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-07-20 17:55:40,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-07-20 17:55:40,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 42 transitions. [2020-07-20 17:55:40,273 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 42 transitions. Word has length 29 [2020-07-20 17:55:40,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:55:40,273 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 42 transitions. [2020-07-20 17:55:40,274 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 17:55:40,274 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 42 transitions. [2020-07-20 17:55:40,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-07-20 17:55:40,275 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:55:40,275 INFO L422 BasicCegarLoop]: trace histogram [7, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:55:40,489 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:40,490 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:55:40,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:55:40,491 INFO L82 PathProgramCache]: Analyzing trace with hash 1833781516, now seen corresponding path program 4 times [2020-07-20 17:55:40,492 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:55:40,492 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [71992858] [2020-07-20 17:55:40,493 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 17:55:40,522 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:55:40,522 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:55:40,523 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 17:55:40,525 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:55:40,668 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 28 proven. 28 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-20 17:55:40,668 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:55:40,868 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 28 proven. 28 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-20 17:55:40,869 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [71992858] [2020-07-20 17:55:40,869 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:55:40,869 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 20 [2020-07-20 17:55:40,870 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [683803915] [2020-07-20 17:55:40,870 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 17:55:40,870 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:55:40,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 17:55:40,871 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=260, Unknown=0, NotChecked=0, Total=380 [2020-07-20 17:55:40,871 INFO L87 Difference]: Start difference. First operand 34 states and 42 transitions. Second operand 20 states. [2020-07-20 17:55:41,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:55:41,397 INFO L93 Difference]: Finished difference Result 62 states and 85 transitions. [2020-07-20 17:55:41,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-20 17:55:41,397 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 33 [2020-07-20 17:55:41,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:55:41,398 INFO L225 Difference]: With dead ends: 62 [2020-07-20 17:55:41,399 INFO L226 Difference]: Without dead ends: 42 [2020-07-20 17:55:41,400 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 160 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=437, Invalid=685, Unknown=0, NotChecked=0, Total=1122 [2020-07-20 17:55:41,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-20 17:55:41,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-07-20 17:55:41,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-07-20 17:55:41,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2020-07-20 17:55:41,408 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 33 [2020-07-20 17:55:41,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:55:41,409 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2020-07-20 17:55:41,409 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 17:55:41,409 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2020-07-20 17:55:41,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-20 17:55:41,410 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:55:41,410 INFO L422 BasicCegarLoop]: trace histogram [15, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:55:41,623 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:41,624 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:55:41,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:55:41,625 INFO L82 PathProgramCache]: Analyzing trace with hash -701369076, now seen corresponding path program 5 times [2020-07-20 17:55:41,626 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:55:41,626 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1452130596] [2020-07-20 17:55:41,627 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 17:55:41,660 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:55:41,660 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:55:41,661 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 17:55:41,664 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:55:41,984 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 52 proven. 120 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-20 17:55:41,985 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:55:42,607 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 52 proven. 120 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-20 17:55:42,608 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1452130596] [2020-07-20 17:55:42,608 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:55:42,608 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 36 [2020-07-20 17:55:42,609 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1819826124] [2020-07-20 17:55:42,610 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-20 17:55:42,611 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:55:42,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-20 17:55:42,612 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=360, Invalid=900, Unknown=0, NotChecked=0, Total=1260 [2020-07-20 17:55:42,612 INFO L87 Difference]: Start difference. First operand 42 states and 50 transitions. Second operand 36 states. [2020-07-20 17:55:44,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:55:44,386 INFO L93 Difference]: Finished difference Result 78 states and 109 transitions. [2020-07-20 17:55:44,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-20 17:55:44,388 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 41 [2020-07-20 17:55:44,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:55:44,389 INFO L225 Difference]: With dead ends: 78 [2020-07-20 17:55:44,389 INFO L226 Difference]: Without dead ends: 58 [2020-07-20 17:55:44,397 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 704 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1637, Invalid=2653, Unknown=0, NotChecked=0, Total=4290 [2020-07-20 17:55:44,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-20 17:55:44,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-07-20 17:55:44,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-07-20 17:55:44,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 66 transitions. [2020-07-20 17:55:44,415 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 66 transitions. Word has length 41 [2020-07-20 17:55:44,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:55:44,416 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 66 transitions. [2020-07-20 17:55:44,416 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-20 17:55:44,416 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 66 transitions. [2020-07-20 17:55:44,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-07-20 17:55:44,417 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:55:44,419 INFO L422 BasicCegarLoop]: trace histogram [31, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:55:44,621 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:44,622 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:55:44,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:55:44,623 INFO L82 PathProgramCache]: Analyzing trace with hash 1471630604, now seen corresponding path program 6 times [2020-07-20 17:55:44,624 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:55:44,625 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [746261749] [2020-07-20 17:55:44,625 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 17:55:44,678 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:55:44,679 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:55:44,681 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 35 conjunts are in the unsatisfiable core [2020-07-20 17:55:44,684 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:55:45,615 INFO L134 CoverageAnalysis]: Checked inductivity of 617 backedges. 100 proven. 496 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-20 17:55:45,615 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:55:47,844 INFO L134 CoverageAnalysis]: Checked inductivity of 617 backedges. 100 proven. 496 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-20 17:55:47,844 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [746261749] [2020-07-20 17:55:47,844 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:55:47,845 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 68 [2020-07-20 17:55:47,845 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1069302942] [2020-07-20 17:55:47,849 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2020-07-20 17:55:47,849 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:55:47,851 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2020-07-20 17:55:47,853 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1224, Invalid=3332, Unknown=0, NotChecked=0, Total=4556 [2020-07-20 17:55:47,853 INFO L87 Difference]: Start difference. First operand 58 states and 66 transitions. Second operand 68 states. [2020-07-20 17:55:55,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:55:55,755 INFO L93 Difference]: Finished difference Result 110 states and 157 transitions. [2020-07-20 17:55:55,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2020-07-20 17:55:55,761 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 57 [2020-07-20 17:55:55,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:55:55,763 INFO L225 Difference]: With dead ends: 110 [2020-07-20 17:55:55,763 INFO L226 Difference]: Without dead ends: 90 [2020-07-20 17:55:55,772 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2944 ImplicationChecksByTransitivity, 10.6s TimeCoverageRelationStatistics Valid=6341, Invalid=10429, Unknown=0, NotChecked=0, Total=16770 [2020-07-20 17:55:55,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-07-20 17:55:55,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2020-07-20 17:55:55,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-07-20 17:55:55,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 98 transitions. [2020-07-20 17:55:55,795 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 98 transitions. Word has length 57 [2020-07-20 17:55:55,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:55:55,796 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 98 transitions. [2020-07-20 17:55:55,796 INFO L480 AbstractCegarLoop]: Interpolant automaton has 68 states. [2020-07-20 17:55:55,796 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 98 transitions. [2020-07-20 17:55:55,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-07-20 17:55:55,802 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:55:55,804 INFO L422 BasicCegarLoop]: trace histogram [63, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:55:56,017 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:56,018 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:55:56,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:55:56,019 INFO L82 PathProgramCache]: Analyzing trace with hash -374211316, now seen corresponding path program 7 times [2020-07-20 17:55:56,020 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:55:56,020 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [524088045] [2020-07-20 17:55:56,021 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 17:55:56,074 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:55:56,074 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:55:56,076 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 67 conjunts are in the unsatisfiable core [2020-07-20 17:55:56,081 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:55:59,449 INFO L134 CoverageAnalysis]: Checked inductivity of 2233 backedges. 196 proven. 2016 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-20 17:55:59,449 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:56:08,214 INFO L134 CoverageAnalysis]: Checked inductivity of 2233 backedges. 196 proven. 2016 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-20 17:56:08,214 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [524088045] [2020-07-20 17:56:08,215 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:56:08,215 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67] total 132 [2020-07-20 17:56:08,215 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1129988241] [2020-07-20 17:56:08,216 INFO L459 AbstractCegarLoop]: Interpolant automaton has 132 states [2020-07-20 17:56:08,216 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:56:08,217 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 132 interpolants. [2020-07-20 17:56:08,221 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4404, Invalid=12888, Unknown=0, NotChecked=0, Total=17292 [2020-07-20 17:56:08,221 INFO L87 Difference]: Start difference. First operand 90 states and 98 transitions. Second operand 132 states. [2020-07-20 17:56:08,454 WARN L193 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 10 [2020-07-20 17:56:08,687 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 193 DAG size of output: 12 [2020-07-20 17:56:08,891 WARN L193 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2020-07-20 17:56:09,094 WARN L193 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 190 DAG size of output: 13 [2020-07-20 17:56:09,288 WARN L193 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 187 DAG size of output: 13 [2020-07-20 17:56:09,497 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 184 DAG size of output: 13 [2020-07-20 17:56:09,699 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 181 DAG size of output: 13 [2020-07-20 17:56:09,915 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 178 DAG size of output: 13 [2020-07-20 17:56:10,132 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 175 DAG size of output: 13 [2020-07-20 17:56:10,335 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 172 DAG size of output: 13 [2020-07-20 17:56:10,552 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 169 DAG size of output: 13 [2020-07-20 17:56:10,763 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 166 DAG size of output: 13 [2020-07-20 17:56:10,987 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 163 DAG size of output: 13 [2020-07-20 17:56:11,197 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 160 DAG size of output: 13 [2020-07-20 17:56:11,421 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 157 DAG size of output: 13 [2020-07-20 17:56:11,640 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 154 DAG size of output: 13 [2020-07-20 17:56:11,857 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 151 DAG size of output: 13 [2020-07-20 17:56:12,068 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 148 DAG size of output: 13 [2020-07-20 17:56:12,287 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 145 DAG size of output: 13 [2020-07-20 17:56:12,505 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 142 DAG size of output: 13 [2020-07-20 17:56:12,728 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 139 DAG size of output: 13 [2020-07-20 17:56:12,942 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 136 DAG size of output: 13 [2020-07-20 17:56:13,174 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 133 DAG size of output: 13 [2020-07-20 17:56:13,410 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 130 DAG size of output: 13 [2020-07-20 17:56:21,912 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 16 [2020-07-20 17:56:22,487 WARN L193 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 222 DAG size of output: 9 [2020-07-20 17:56:23,042 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 9 [2020-07-20 17:56:23,600 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 214 DAG size of output: 9 [2020-07-20 17:56:24,155 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 210 DAG size of output: 9 [2020-07-20 17:56:24,726 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 9 [2020-07-20 17:56:25,288 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 202 DAG size of output: 9 [2020-07-20 17:56:25,853 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 198 DAG size of output: 9 [2020-07-20 17:56:26,415 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 9 [2020-07-20 17:56:26,966 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 190 DAG size of output: 9 [2020-07-20 17:56:27,504 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 186 DAG size of output: 9 [2020-07-20 17:56:28,054 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 9 [2020-07-20 17:56:28,604 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 178 DAG size of output: 9 [2020-07-20 17:56:29,159 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 174 DAG size of output: 9 [2020-07-20 17:56:29,694 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 9 [2020-07-20 17:56:30,216 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 166 DAG size of output: 9 [2020-07-20 17:56:48,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:56:48,708 INFO L93 Difference]: Finished difference Result 167 states and 239 transitions. [2020-07-20 17:56:48,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 123 states. [2020-07-20 17:56:48,710 INFO L78 Accepts]: Start accepts. Automaton has 132 states. Word has length 89 [2020-07-20 17:56:48,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:56:48,713 INFO L225 Difference]: With dead ends: 167 [2020-07-20 17:56:48,713 INFO L226 Difference]: Without dead ends: 147 [2020-07-20 17:56:48,727 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 296 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 249 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11163 ImplicationChecksByTransitivity, 51.7s TimeCoverageRelationStatistics Valid=23060, Invalid=39690, Unknown=0, NotChecked=0, Total=62750 [2020-07-20 17:56:48,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2020-07-20 17:56:48,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 147. [2020-07-20 17:56:48,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2020-07-20 17:56:48,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 155 transitions. [2020-07-20 17:56:48,754 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 155 transitions. Word has length 89 [2020-07-20 17:56:48,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:56:48,756 INFO L479 AbstractCegarLoop]: Abstraction has 147 states and 155 transitions. [2020-07-20 17:56:48,756 INFO L480 AbstractCegarLoop]: Interpolant automaton has 132 states. [2020-07-20 17:56:48,756 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 155 transitions. [2020-07-20 17:56:48,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2020-07-20 17:56:48,758 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:56:48,758 INFO L422 BasicCegarLoop]: trace histogram [120, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:56:48,978 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:56:48,978 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:56:48,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:56:48,979 INFO L82 PathProgramCache]: Analyzing trace with hash -1451426972, now seen corresponding path program 8 times [2020-07-20 17:56:48,980 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:56:48,980 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1194985188] [2020-07-20 17:56:48,981 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 17:56:49,085 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:56:49,086 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:56:49,094 INFO L263 TraceCheckSpWp]: Trace formula consists of 414 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 17:56:49,100 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:56:49,272 INFO L134 CoverageAnalysis]: Checked inductivity of 7648 backedges. 0 proven. 745 refuted. 0 times theorem prover too weak. 6903 trivial. 0 not checked. [2020-07-20 17:56:49,272 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:56:49,559 INFO L134 CoverageAnalysis]: Checked inductivity of 7648 backedges. 237 proven. 508 refuted. 0 times theorem prover too weak. 6903 trivial. 0 not checked. [2020-07-20 17:56:49,559 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1194985188] [2020-07-20 17:56:49,559 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:56:49,560 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 16 [2020-07-20 17:56:49,560 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [540190963] [2020-07-20 17:56:49,561 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 17:56:49,561 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:56:49,561 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 17:56:49,561 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=168, Unknown=0, NotChecked=0, Total=240 [2020-07-20 17:56:49,562 INFO L87 Difference]: Start difference. First operand 147 states and 155 transitions. Second operand 16 states. [2020-07-20 17:56:51,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:56:51,198 INFO L93 Difference]: Finished difference Result 239 states and 310 transitions. [2020-07-20 17:56:51,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-07-20 17:56:51,200 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 146 [2020-07-20 17:56:51,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:56:51,206 INFO L225 Difference]: With dead ends: 239 [2020-07-20 17:56:51,206 INFO L226 Difference]: Without dead ends: 234 [2020-07-20 17:56:51,207 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 326 GetRequests, 276 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 713 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=724, Invalid=1826, Unknown=0, NotChecked=0, Total=2550 [2020-07-20 17:56:51,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 234 states. [2020-07-20 17:56:51,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 234 to 193. [2020-07-20 17:56:51,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 193 states. [2020-07-20 17:56:51,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 233 transitions. [2020-07-20 17:56:51,257 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 233 transitions. Word has length 146 [2020-07-20 17:56:51,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:56:51,258 INFO L479 AbstractCegarLoop]: Abstraction has 193 states and 233 transitions. [2020-07-20 17:56:51,258 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 17:56:51,258 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 233 transitions. [2020-07-20 17:56:51,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2020-07-20 17:56:51,262 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:56:51,262 INFO L422 BasicCegarLoop]: trace histogram [120, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:56:51,463 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:56:51,464 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:56:51,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:56:51,465 INFO L82 PathProgramCache]: Analyzing trace with hash 334948414, now seen corresponding path program 9 times [2020-07-20 17:56:51,465 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:56:51,466 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1733948824] [2020-07-20 17:56:51,466 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 17:56:51,551 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:56:51,551 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:56:51,553 INFO L263 TraceCheckSpWp]: Trace formula consists of 449 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 17:56:51,556 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:56:51,727 INFO L134 CoverageAnalysis]: Checked inductivity of 8373 backedges. 0 proven. 1113 refuted. 0 times theorem prover too weak. 7260 trivial. 0 not checked. [2020-07-20 17:56:51,727 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:56:52,075 INFO L134 CoverageAnalysis]: Checked inductivity of 8373 backedges. 0 proven. 1113 refuted. 0 times theorem prover too weak. 7260 trivial. 0 not checked. [2020-07-20 17:56:52,076 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1733948824] [2020-07-20 17:56:52,076 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:56:52,076 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 22 [2020-07-20 17:56:52,077 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [139558486] [2020-07-20 17:56:52,077 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 17:56:52,077 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:56:52,077 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 17:56:52,078 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2020-07-20 17:56:52,078 INFO L87 Difference]: Start difference. First operand 193 states and 233 transitions. Second operand 22 states. [2020-07-20 17:56:52,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:56:52,326 INFO L93 Difference]: Finished difference Result 1081 states and 1693 transitions. [2020-07-20 17:56:52,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-20 17:56:52,328 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 166 [2020-07-20 17:56:52,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:56:52,336 INFO L225 Difference]: With dead ends: 1081 [2020-07-20 17:56:52,337 INFO L226 Difference]: Without dead ends: 1076 [2020-07-20 17:56:52,338 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 331 GetRequests, 311 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2020-07-20 17:56:52,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1076 states. [2020-07-20 17:56:52,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1076 to 823. [2020-07-20 17:56:52,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 823 states. [2020-07-20 17:56:52,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 823 states to 823 states and 1253 transitions. [2020-07-20 17:56:52,405 INFO L78 Accepts]: Start accepts. Automaton has 823 states and 1253 transitions. Word has length 166 [2020-07-20 17:56:52,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:56:52,406 INFO L479 AbstractCegarLoop]: Abstraction has 823 states and 1253 transitions. [2020-07-20 17:56:52,406 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 17:56:52,406 INFO L276 IsEmpty]: Start isEmpty. Operand 823 states and 1253 transitions. [2020-07-20 17:56:52,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 211 [2020-07-20 17:56:52,409 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:56:52,410 INFO L422 BasicCegarLoop]: trace histogram [120, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:56:52,623 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:56:52,623 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:56:52,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:56:52,624 INFO L82 PathProgramCache]: Analyzing trace with hash -149517180, now seen corresponding path program 10 times [2020-07-20 17:56:52,625 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:56:52,625 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [576342323] [2020-07-20 17:56:52,626 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 17:56:52,724 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:56:52,724 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:56:52,730 INFO L263 TraceCheckSpWp]: Trace formula consists of 526 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 17:56:52,732 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:56:53,404 INFO L134 CoverageAnalysis]: Checked inductivity of 10320 backedges. 0 proven. 3417 refuted. 0 times theorem prover too weak. 6903 trivial. 0 not checked. [2020-07-20 17:56:53,404 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:56:54,955 INFO L134 CoverageAnalysis]: Checked inductivity of 10320 backedges. 237 proven. 3180 refuted. 0 times theorem prover too weak. 6903 trivial. 0 not checked. [2020-07-20 17:56:54,955 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [576342323] [2020-07-20 17:56:54,956 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:56:54,956 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 48 [2020-07-20 17:56:54,956 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [648726969] [2020-07-20 17:56:54,957 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-07-20 17:56:54,957 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:56:54,958 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-07-20 17:56:54,958 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=920, Invalid=1336, Unknown=0, NotChecked=0, Total=2256 [2020-07-20 17:56:54,958 INFO L87 Difference]: Start difference. First operand 823 states and 1253 transitions. Second operand 48 states. [2020-07-20 17:57:07,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:57:07,319 INFO L93 Difference]: Finished difference Result 3512 states and 5589 transitions. [2020-07-20 17:57:07,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 169 states. [2020-07-20 17:57:07,321 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 210 [2020-07-20 17:57:07,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:57:07,340 INFO L225 Difference]: With dead ends: 3512 [2020-07-20 17:57:07,341 INFO L226 Difference]: Without dead ends: 3507 [2020-07-20 17:57:07,346 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 582 GetRequests, 372 SyntacticMatches, 1 SemanticMatches, 209 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16561 ImplicationChecksByTransitivity, 12.7s TimeCoverageRelationStatistics Valid=12068, Invalid=32242, Unknown=0, NotChecked=0, Total=44310 [2020-07-20 17:57:07,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3507 states. [2020-07-20 17:57:07,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3507 to 369. [2020-07-20 17:57:07,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 369 states. [2020-07-20 17:57:07,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 369 states to 369 states and 521 transitions. [2020-07-20 17:57:07,425 INFO L78 Accepts]: Start accepts. Automaton has 369 states and 521 transitions. Word has length 210 [2020-07-20 17:57:07,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:57:07,426 INFO L479 AbstractCegarLoop]: Abstraction has 369 states and 521 transitions. [2020-07-20 17:57:07,426 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-07-20 17:57:07,426 INFO L276 IsEmpty]: Start isEmpty. Operand 369 states and 521 transitions. [2020-07-20 17:57:07,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 295 [2020-07-20 17:57:07,430 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:57:07,430 INFO L422 BasicCegarLoop]: trace histogram [120, 41, 41, 41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:57:07,644 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:57:07,645 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:57:07,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:57:07,645 INFO L82 PathProgramCache]: Analyzing trace with hash -135697794, now seen corresponding path program 11 times [2020-07-20 17:57:07,646 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:57:07,646 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [88320229] [2020-07-20 17:57:07,647 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 17:57:07,792 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:57:07,793 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:57:07,795 INFO L263 TraceCheckSpWp]: Trace formula consists of 673 conjuncts, 43 conjunts are in the unsatisfiable core [2020-07-20 17:57:07,801 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:57:09,663 INFO L134 CoverageAnalysis]: Checked inductivity of 15381 backedges. 0 proven. 8121 refuted. 0 times theorem prover too weak. 7260 trivial. 0 not checked. [2020-07-20 17:57:09,663 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:57:14,864 INFO L134 CoverageAnalysis]: Checked inductivity of 15381 backedges. 0 proven. 8121 refuted. 0 times theorem prover too weak. 7260 trivial. 0 not checked. [2020-07-20 17:57:14,865 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [88320229] [2020-07-20 17:57:14,865 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:57:14,865 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44] total 86 [2020-07-20 17:57:14,866 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1130918542] [2020-07-20 17:57:14,866 INFO L459 AbstractCegarLoop]: Interpolant automaton has 86 states [2020-07-20 17:57:14,867 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:57:14,868 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2020-07-20 17:57:14,869 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3655, Invalid=3655, Unknown=0, NotChecked=0, Total=7310 [2020-07-20 17:57:14,869 INFO L87 Difference]: Start difference. First operand 369 states and 521 transitions. Second operand 86 states. [2020-07-20 17:57:18,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:57:18,100 INFO L93 Difference]: Finished difference Result 15329 states and 25101 transitions. [2020-07-20 17:57:18,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2020-07-20 17:57:18,103 INFO L78 Accepts]: Start accepts. Automaton has 86 states. Word has length 294 [2020-07-20 17:57:18,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:57:18,172 INFO L225 Difference]: With dead ends: 15329 [2020-07-20 17:57:18,172 INFO L226 Difference]: Without dead ends: 15324 [2020-07-20 17:57:18,178 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 587 GetRequests, 503 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=3655, Invalid=3655, Unknown=0, NotChecked=0, Total=7310 [2020-07-20 17:57:18,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15324 states. [2020-07-20 17:57:19,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15324 to 10423. [2020-07-20 17:57:19,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10423 states. [2020-07-20 17:57:19,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10423 states to 10423 states and 16933 transitions. [2020-07-20 17:57:19,830 INFO L78 Accepts]: Start accepts. Automaton has 10423 states and 16933 transitions. Word has length 294 [2020-07-20 17:57:19,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:57:19,831 INFO L479 AbstractCegarLoop]: Abstraction has 10423 states and 16933 transitions. [2020-07-20 17:57:19,831 INFO L480 AbstractCegarLoop]: Interpolant automaton has 86 states. [2020-07-20 17:57:19,831 INFO L276 IsEmpty]: Start isEmpty. Operand 10423 states and 16933 transitions. [2020-07-20 17:57:19,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 467 [2020-07-20 17:57:19,864 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:57:19,865 INFO L422 BasicCegarLoop]: trace histogram [120, 84, 84, 84, 84, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:57:20,077 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:57:20,078 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:57:20,078 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:57:20,078 INFO L82 PathProgramCache]: Analyzing trace with hash -628961020, now seen corresponding path program 12 times [2020-07-20 17:57:20,079 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:57:20,079 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [126454918] [2020-07-20 17:57:20,080 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 17:57:20,267 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:57:20,267 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:57:20,286 INFO L263 TraceCheckSpWp]: Trace formula consists of 974 conjuncts, 93 conjunts are in the unsatisfiable core [2020-07-20 17:57:20,295 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:57:29,554 INFO L134 CoverageAnalysis]: Checked inductivity of 31248 backedges. 0 proven. 24920 refuted. 0 times theorem prover too weak. 6328 trivial. 0 not checked. [2020-07-20 17:57:29,555 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:57:39,685 INFO L134 CoverageAnalysis]: Checked inductivity of 31248 backedges. 812 proven. 24108 refuted. 0 times theorem prover too weak. 6328 trivial. 0 not checked. [2020-07-20 17:57:39,686 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [126454918] [2020-07-20 17:57:39,686 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:57:39,686 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [94, 94] total 102 [2020-07-20 17:57:39,687 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [607732275] [2020-07-20 17:57:39,688 INFO L459 AbstractCegarLoop]: Interpolant automaton has 102 states [2020-07-20 17:57:39,688 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:57:39,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 102 interpolants. [2020-07-20 17:57:39,689 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3744, Invalid=6558, Unknown=0, NotChecked=0, Total=10302 [2020-07-20 17:57:39,689 INFO L87 Difference]: Start difference. First operand 10423 states and 16933 transitions. Second operand 102 states. [2020-07-20 17:57:53,355 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-20 17:58:00,351 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2020-07-20 18:00:12,841 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-20 18:01:18,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:01:18,924 INFO L93 Difference]: Finished difference Result 351777 states and 570694 transitions. [2020-07-20 18:01:18,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 702 states. [2020-07-20 18:01:18,928 INFO L78 Accepts]: Start accepts. Automaton has 102 states. Word has length 466 [2020-07-20 18:01:18,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:01:19,948 INFO L225 Difference]: With dead ends: 351777 [2020-07-20 18:01:19,948 INFO L226 Difference]: Without dead ends: 351772 [2020-07-20 18:01:20,114 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1627 GetRequests, 748 SyntacticMatches, 83 SemanticMatches, 796 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 281045 ImplicationChecksByTransitivity, 192.9s TimeCoverageRelationStatistics Valid=120270, Invalid=515736, Unknown=0, NotChecked=0, Total=636006 [2020-07-20 18:01:20,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 351772 states. [2020-07-20 18:01:31,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 351772 to 15315. [2020-07-20 18:01:31,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15315 states. [2020-07-20 18:01:31,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15315 states to 15315 states and 24845 transitions. [2020-07-20 18:01:31,418 INFO L78 Accepts]: Start accepts. Automaton has 15315 states and 24845 transitions. Word has length 466 [2020-07-20 18:01:31,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:01:31,418 INFO L479 AbstractCegarLoop]: Abstraction has 15315 states and 24845 transitions. [2020-07-20 18:01:31,419 INFO L480 AbstractCegarLoop]: Interpolant automaton has 102 states. [2020-07-20 18:01:31,419 INFO L276 IsEmpty]: Start isEmpty. Operand 15315 states and 24845 transitions. [2020-07-20 18:01:31,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 471 [2020-07-20 18:01:31,462 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:01:31,463 INFO L422 BasicCegarLoop]: trace histogram [120, 85, 85, 85, 85, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:01:31,677 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:01:31,678 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:01:31,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:01:31,679 INFO L82 PathProgramCache]: Analyzing trace with hash 797939094, now seen corresponding path program 13 times [2020-07-20 18:01:31,679 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:01:31,679 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1797657166] [2020-07-20 18:01:31,680 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 18:01:31,882 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 18:01:31,883 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:01:31,900 INFO L263 TraceCheckSpWp]: Trace formula consists of 981 conjuncts, 95 conjunts are in the unsatisfiable core [2020-07-20 18:01:31,909 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:01:49,168 INFO L134 CoverageAnalysis]: Checked inductivity of 31705 backedges. 0 proven. 25489 refuted. 0 times theorem prover too weak. 6216 trivial. 0 not checked. [2020-07-20 18:01:49,169 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:02:08,874 INFO L134 CoverageAnalysis]: Checked inductivity of 31705 backedges. 924 proven. 24565 refuted. 0 times theorem prover too weak. 6216 trivial. 0 not checked. [2020-07-20 18:02:08,874 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1797657166] [2020-07-20 18:02:08,875 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 18:02:08,875 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [96, 96] total 107 [2020-07-20 18:02:08,875 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1115876178] [2020-07-20 18:02:08,877 INFO L459 AbstractCegarLoop]: Interpolant automaton has 107 states [2020-07-20 18:02:08,877 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:02:08,878 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2020-07-20 18:02:08,879 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4041, Invalid=7301, Unknown=0, NotChecked=0, Total=11342 [2020-07-20 18:02:08,879 INFO L87 Difference]: Start difference. First operand 15315 states and 24845 transitions. Second operand 107 states. [2020-07-20 18:02:10,840 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 22 [2020-07-20 18:02:11,700 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 22 [2020-07-20 18:02:12,387 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 22 [2020-07-20 18:02:13,019 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 21 [2020-07-20 18:02:14,390 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 21 [2020-07-20 18:02:15,345 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 22 [2020-07-20 18:02:28,393 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 22 [2020-07-20 18:02:30,892 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 22 [2020-07-20 18:02:31,940 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 22 [2020-07-20 18:02:34,705 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 22 [2020-07-20 18:02:39,138 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-20 18:02:43,014 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 22 [2020-07-20 18:02:51,329 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 22 [2020-07-20 18:02:55,843 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 22 [2020-07-20 18:03:00,379 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 22 [2020-07-20 18:03:11,605 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 22 [2020-07-20 18:03:13,060 WARN L193 SmtUtils]: Spent 238.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 18:03:16,430 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 22 [2020-07-20 18:03:17,489 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 22 [2020-07-20 18:03:23,121 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 22 [2020-07-20 18:03:24,465 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 18:03:28,647 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 22 [2020-07-20 18:03:29,872 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 18:03:34,362 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 22 [2020-07-20 18:03:35,642 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 18:03:40,295 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 22 [2020-07-20 18:03:41,620 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 18:03:46,229 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 22 [2020-07-20 18:03:47,813 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 18:03:52,587 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 22 [2020-07-20 18:03:54,000 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 18:03:59,117 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 22 [2020-07-20 18:04:00,576 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 18:04:05,869 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 22 [2020-07-20 18:04:07,378 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 18:04:12,878 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 22 [2020-07-20 18:04:14,423 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 18:04:20,126 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 22 [2020-07-20 18:04:21,685 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 18:04:27,521 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 22 [2020-07-20 18:04:29,166 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 18:04:35,175 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 22 [2020-07-20 18:04:36,845 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 18:04:42,958 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 22 [2020-07-20 18:04:44,635 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 18:04:50,890 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 22 [2020-07-20 18:04:52,638 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 18:04:58,997 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 22 [2020-07-20 18:05:00,795 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 18:05:07,462 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 22 [2020-07-20 18:05:09,325 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 18:05:19,711 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 18:05:37,850 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 22 [2020-07-20 18:05:51,117 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 18:05:59,625 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 18:06:08,133 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 18:06:16,733 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 18:06:25,021 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 18:06:33,439 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 18:06:41,592 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 18:06:49,605 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 18:06:57,584 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 18:07:05,661 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 18:07:13,424 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 18:07:21,123 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 18:07:28,678 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 18:07:36,164 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 18:07:43,537 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 18:07:50,800 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 18:07:57,826 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 18:08:04,985 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 18:08:11,888 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 18:08:18,635 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 18:08:25,589 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 18:08:32,106 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 18:08:45,222 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 18:08:59,334 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 18:09:07,228 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21