/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_FUNCTIONS --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/jm2006_variant.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 14:35:08,784 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 14:35:08,788 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 14:35:08,810 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 14:35:08,810 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 14:35:08,813 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 14:35:08,815 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 14:35:08,828 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 14:35:08,830 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 14:35:08,832 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 14:35:08,834 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 14:35:08,835 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 14:35:08,836 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 14:35:08,840 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 14:35:08,842 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 14:35:08,845 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 14:35:08,846 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 14:35:08,847 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 14:35:08,848 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 14:35:08,850 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 14:35:08,852 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 14:35:08,853 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 14:35:08,855 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 14:35:08,855 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 14:35:08,858 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 14:35:08,866 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 14:35:08,867 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 14:35:08,868 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 14:35:08,869 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 14:35:08,884 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 14:35:08,885 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 14:35:08,886 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 14:35:08,886 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 14:35:08,887 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 14:35:08,887 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 14:35:08,887 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 14:35:08,887 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 14:35:08,888 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 14:35:08,888 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 14:35:08,888 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 14:35:08,888 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 14:35:08,889 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 14:35:08,889 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 14:35:08,889 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 14:35:08,889 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 14:35:08,889 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 14:35:08,890 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 14:35:08,890 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 14:35:08,890 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 14:35:08,890 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 14:35:08,891 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 14:35:08,891 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 14:35:08,891 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 14:35:08,891 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 14:35:08,891 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 14:35:08,892 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:35:08,892 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 14:35:08,892 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 14:35:08,892 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_FUNCTIONS 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 14:35:09,220 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 14:35:09,240 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 14:35:09,246 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 14:35:09,250 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 14:35:09,251 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 14:35:09,252 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/jm2006_variant.i [2020-07-20 14:35:09,320 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d992f3d10/6b973e6530b54211b5ce968787668161/FLAGc385cf082 [2020-07-20 14:35:09,797 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 14:35:09,798 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-lit/jm2006_variant.i [2020-07-20 14:35:09,807 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d992f3d10/6b973e6530b54211b5ce968787668161/FLAGc385cf082 [2020-07-20 14:35:10,125 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d992f3d10/6b973e6530b54211b5ce968787668161 [2020-07-20 14:35:10,135 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 14:35:10,137 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 14:35:10,139 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 14:35:10,139 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 14:35:10,144 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 14:35:10,145 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 02:35:10" (1/1) ... [2020-07-20 14:35:10,148 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3cdf4913 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:35:10, skipping insertion in model container [2020-07-20 14:35:10,149 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 02:35:10" (1/1) ... [2020-07-20 14:35:10,158 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 14:35:10,176 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 14:35:10,391 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 14:35:10,397 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 14:35:10,412 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 14:35:10,426 INFO L208 MainTranslator]: Completed translation [2020-07-20 14:35:10,426 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:35:10 WrapperNode [2020-07-20 14:35:10,426 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 14:35:10,427 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 14:35:10,427 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 14:35:10,427 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 14:35:10,438 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:35:10" (1/1) ... [2020-07-20 14:35:10,439 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:35:10" (1/1) ... [2020-07-20 14:35:10,444 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:35:10" (1/1) ... [2020-07-20 14:35:10,444 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:35:10" (1/1) ... [2020-07-20 14:35:10,448 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:35:10" (1/1) ... [2020-07-20 14:35:10,452 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:35:10" (1/1) ... [2020-07-20 14:35:10,454 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:35:10" (1/1) ... [2020-07-20 14:35:10,540 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 14:35:10,541 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 14:35:10,541 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 14:35:10,541 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 14:35:10,550 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:35:10" (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 14:35:10,618 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 14:35:10,618 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 14:35:10,618 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 14:35:10,619 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 14:35:10,619 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 14:35:10,619 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 14:35:10,619 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 14:35:10,619 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 14:35:10,620 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 14:35:10,620 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 14:35:10,620 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 14:35:10,620 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 14:35:10,620 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 14:35:10,979 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 14:35:10,980 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 14:35:10,986 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 02:35:10 BoogieIcfgContainer [2020-07-20 14:35:10,986 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 14:35:10,988 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 14:35:10,988 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 14:35:10,993 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 14:35:10,993 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 02:35:10" (1/3) ... [2020-07-20 14:35:10,995 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@59d46811 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 02:35:10, skipping insertion in model container [2020-07-20 14:35:10,995 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:35:10" (2/3) ... [2020-07-20 14:35:10,995 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@59d46811 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 02:35:10, skipping insertion in model container [2020-07-20 14:35:10,995 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 02:35:10" (3/3) ... [2020-07-20 14:35:10,998 INFO L109 eAbstractionObserver]: Analyzing ICFG jm2006_variant.i [2020-07-20 14:35:11,012 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 14:35:11,021 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 14:35:11,053 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 14:35:11,110 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 14:35:11,110 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 14:35:11,110 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 14:35:11,110 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 14:35:11,111 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 14:35:11,111 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 14:35:11,111 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 14:35:11,111 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 14:35:11,132 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-07-20 14:35:11,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 14:35:11,140 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:35:11,141 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:35:11,142 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:35:11,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:35:11,147 INFO L82 PathProgramCache]: Analyzing trace with hash -362650722, now seen corresponding path program 1 times [2020-07-20 14:35:11,154 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:35:11,155 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1555701799] [2020-07-20 14:35:11,155 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 14:35:11,238 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:35:11,239 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:35:11,242 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 14:35:11,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:35:11,352 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-20 14:35:11,392 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 14:35:11,393 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 14:35:11,394 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1555701799] [2020-07-20 14:35:11,394 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 14:35:11,395 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-07-20 14:35:11,396 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [165337660] [2020-07-20 14:35:11,402 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-20 14:35:11,402 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:35:11,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-20 14:35:11,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-07-20 14:35:11,419 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 7 states. [2020-07-20 14:35:11,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:35:11,635 INFO L93 Difference]: Finished difference Result 47 states and 59 transitions. [2020-07-20 14:35:11,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 14:35:11,638 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 13 [2020-07-20 14:35:11,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:35:11,648 INFO L225 Difference]: With dead ends: 47 [2020-07-20 14:35:11,649 INFO L226 Difference]: Without dead ends: 15 [2020-07-20 14:35:11,653 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-07-20 14:35:11,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-07-20 14:35:11,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-07-20 14:35:11,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-07-20 14:35:11,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-07-20 14:35:11,699 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-07-20 14:35:11,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:35:11,700 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-07-20 14:35:11,700 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-20 14:35:11,700 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-07-20 14:35:11,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 14:35:11,701 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:35:11,702 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:35:11,915 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:35:11,915 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:35:11,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:35:11,916 INFO L82 PathProgramCache]: Analyzing trace with hash -1126137131, now seen corresponding path program 1 times [2020-07-20 14:35:11,916 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:35:11,917 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1757468556] [2020-07-20 14:35:11,917 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 14:35:11,963 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:35:11,963 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:35:11,965 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 14:35:11,969 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:35:12,074 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:35:12,074 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:35:12,109 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:35:12,229 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:35:12,230 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1757468556] [2020-07-20 14:35:12,231 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:35:12,231 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 12 [2020-07-20 14:35:12,231 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1649995832] [2020-07-20 14:35:12,233 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 14:35:12,233 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:35:12,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 14:35:12,234 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2020-07-20 14:35:12,235 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 12 states. [2020-07-20 14:35:12,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:35:12,526 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2020-07-20 14:35:12,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 14:35:12,527 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 14 [2020-07-20 14:35:12,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:35:12,528 INFO L225 Difference]: With dead ends: 26 [2020-07-20 14:35:12,528 INFO L226 Difference]: Without dead ends: 18 [2020-07-20 14:35:12,530 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=79, Invalid=227, Unknown=0, NotChecked=0, Total=306 [2020-07-20 14:35:12,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-20 14:35:12,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-20 14:35:12,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-20 14:35:12,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-07-20 14:35:12,536 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 14 [2020-07-20 14:35:12,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:35:12,537 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-07-20 14:35:12,537 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 14:35:12,537 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-07-20 14:35:12,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-20 14:35:12,538 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:35:12,538 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:35:12,752 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:35:12,753 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:35:12,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:35:12,753 INFO L82 PathProgramCache]: Analyzing trace with hash -1467221666, now seen corresponding path program 2 times [2020-07-20 14:35:12,754 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:35:12,754 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1519167356] [2020-07-20 14:35:12,754 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 14:35:12,785 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:35:12,785 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:35:12,787 WARN L261 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 37 conjunts are in the unsatisfiable core [2020-07-20 14:35:12,789 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:35:12,928 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:35:12,928 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:35:12,957 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:35:13,148 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:35:13,149 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1519167356] [2020-07-20 14:35:13,149 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:35:13,150 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2020-07-20 14:35:13,150 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [245734519] [2020-07-20 14:35:13,151 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 14:35:13,151 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:35:13,151 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 14:35:13,152 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 14:35:13,152 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 18 states. [2020-07-20 14:35:13,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:35:13,803 INFO L93 Difference]: Finished difference Result 32 states and 37 transitions. [2020-07-20 14:35:13,803 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-20 14:35:13,803 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 17 [2020-07-20 14:35:13,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:35:13,804 INFO L225 Difference]: With dead ends: 32 [2020-07-20 14:35:13,804 INFO L226 Difference]: Without dead ends: 24 [2020-07-20 14:35:13,805 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=194, Invalid=562, Unknown=0, NotChecked=0, Total=756 [2020-07-20 14:35:13,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-20 14:35:13,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-20 14:35:13,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-20 14:35:13,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2020-07-20 14:35:13,812 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 17 [2020-07-20 14:35:13,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:35:13,813 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2020-07-20 14:35:13,813 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 14:35:13,813 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2020-07-20 14:35:13,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-20 14:35:13,814 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:35:13,814 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:35:14,029 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:35:14,031 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:35:14,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:35:14,032 INFO L82 PathProgramCache]: Analyzing trace with hash 2094249470, now seen corresponding path program 3 times [2020-07-20 14:35:14,032 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:35:14,033 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1556270775] [2020-07-20 14:35:14,033 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 14:35:14,073 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:35:14,074 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:35:14,076 WARN L261 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 73 conjunts are in the unsatisfiable core [2020-07-20 14:35:14,079 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:35:14,408 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:35:14,408 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:35:14,455 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:35:15,055 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:35:15,055 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1556270775] [2020-07-20 14:35:15,055 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:35:15,056 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 30 [2020-07-20 14:35:15,056 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [957528525] [2020-07-20 14:35:15,056 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-07-20 14:35:15,057 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:35:15,057 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-07-20 14:35:15,058 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=684, Unknown=0, NotChecked=0, Total=870 [2020-07-20 14:35:15,058 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 30 states. [2020-07-20 14:35:15,688 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 52 [2020-07-20 14:35:15,988 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 51 [2020-07-20 14:35:16,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:35:16,978 INFO L93 Difference]: Finished difference Result 44 states and 55 transitions. [2020-07-20 14:35:16,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-07-20 14:35:16,979 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 23 [2020-07-20 14:35:16,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:35:16,980 INFO L225 Difference]: With dead ends: 44 [2020-07-20 14:35:16,980 INFO L226 Difference]: Without dead ends: 36 [2020-07-20 14:35:16,982 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 186 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=566, Invalid=1504, Unknown=0, NotChecked=0, Total=2070 [2020-07-20 14:35:16,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-20 14:35:17,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-07-20 14:35:17,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 14:35:17,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-07-20 14:35:17,004 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 23 [2020-07-20 14:35:17,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:35:17,007 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-07-20 14:35:17,007 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-07-20 14:35:17,007 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-07-20 14:35:17,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-07-20 14:35:17,009 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:35:17,009 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:35:17,224 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:35:17,225 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:35:17,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:35:17,226 INFO L82 PathProgramCache]: Analyzing trace with hash -810203330, now seen corresponding path program 4 times [2020-07-20 14:35:17,227 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:35:17,227 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1741250864] [2020-07-20 14:35:17,228 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 14:35:17,297 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:35:17,298 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:35:17,303 WARN L261 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 145 conjunts are in the unsatisfiable core [2020-07-20 14:35:17,306 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:35:18,200 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:35:18,200 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:35:18,285 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:35:20,017 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:35:20,017 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1741250864] [2020-07-20 14:35:20,018 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:35:20,018 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 54 [2020-07-20 14:35:20,018 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [847501495] [2020-07-20 14:35:20,019 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2020-07-20 14:35:20,019 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:35:20,020 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2020-07-20 14:35:20,021 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=642, Invalid=2220, Unknown=0, NotChecked=0, Total=2862 [2020-07-20 14:35:20,021 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 54 states. [2020-07-20 14:35:21,096 WARN L193 SmtUtils]: Spent 187.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2020-07-20 14:35:21,519 WARN L193 SmtUtils]: Spent 295.00 ms on a formula simplification. DAG size of input: 122 DAG size of output: 100 [2020-07-20 14:35:21,878 WARN L193 SmtUtils]: Spent 175.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2020-07-20 14:35:22,235 WARN L193 SmtUtils]: Spent 282.00 ms on a formula simplification. DAG size of input: 121 DAG size of output: 99 [2020-07-20 14:35:22,634 WARN L193 SmtUtils]: Spent 186.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2020-07-20 14:35:23,066 WARN L193 SmtUtils]: Spent 165.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2020-07-20 14:35:23,405 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2020-07-20 14:35:23,739 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2020-07-20 14:35:24,043 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2020-07-20 14:35:24,337 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2020-07-20 14:35:24,620 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2020-07-20 14:35:24,903 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2020-07-20 14:35:25,171 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2020-07-20 14:35:27,804 WARN L193 SmtUtils]: Spent 195.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2020-07-20 14:35:27,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:35:27,821 INFO L93 Difference]: Finished difference Result 68 states and 91 transitions. [2020-07-20 14:35:27,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2020-07-20 14:35:27,823 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 35 [2020-07-20 14:35:27,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:35:27,824 INFO L225 Difference]: With dead ends: 68 [2020-07-20 14:35:27,824 INFO L226 Difference]: Without dead ends: 60 [2020-07-20 14:35:27,827 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 528 ImplicationChecksByTransitivity, 9.3s TimeCoverageRelationStatistics Valid=1958, Invalid=4684, Unknown=0, NotChecked=0, Total=6642 [2020-07-20 14:35:27,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-20 14:35:27,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2020-07-20 14:35:27,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-20 14:35:27,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 60 transitions. [2020-07-20 14:35:27,846 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 60 transitions. Word has length 35 [2020-07-20 14:35:27,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:35:27,846 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 60 transitions. [2020-07-20 14:35:27,847 INFO L480 AbstractCegarLoop]: Interpolant automaton has 54 states. [2020-07-20 14:35:27,847 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 60 transitions. [2020-07-20 14:35:27,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-07-20 14:35:27,848 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:35:27,849 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:35:28,064 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:35:28,065 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:35:28,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:35:28,066 INFO L82 PathProgramCache]: Analyzing trace with hash 404277694, now seen corresponding path program 5 times [2020-07-20 14:35:28,067 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:35:28,067 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [584941024] [2020-07-20 14:35:28,067 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 14:35:28,172 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:35:28,172 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:35:28,180 WARN L261 TraceCheckSpWp]: Trace formula consists of 362 conjuncts, 289 conjunts are in the unsatisfiable core [2020-07-20 14:35:28,186 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:35:31,082 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:35:31,083 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:35:31,274 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:35:38,903 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:35:38,904 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [584941024] [2020-07-20 14:35:38,904 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:35:38,904 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53] total 102 [2020-07-20 14:35:38,905 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [605123756] [2020-07-20 14:35:38,905 INFO L459 AbstractCegarLoop]: Interpolant automaton has 102 states [2020-07-20 14:35:38,906 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:35:38,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 102 interpolants. [2020-07-20 14:35:38,910 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2418, Invalid=7884, Unknown=0, NotChecked=0, Total=10302 [2020-07-20 14:35:38,910 INFO L87 Difference]: Start difference. First operand 60 states and 60 transitions. Second operand 102 states. [2020-07-20 14:35:43,038 WARN L193 SmtUtils]: Spent 600.00 ms on a formula simplification that was a NOOP. DAG size: 244 [2020-07-20 14:35:44,308 WARN L193 SmtUtils]: Spent 920.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 196 [2020-07-20 14:35:45,875 WARN L193 SmtUtils]: Spent 576.00 ms on a formula simplification that was a NOOP. DAG size: 239 [2020-07-20 14:35:46,973 WARN L193 SmtUtils]: Spent 890.00 ms on a formula simplification. DAG size of input: 241 DAG size of output: 195 [2020-07-20 14:35:48,529 WARN L193 SmtUtils]: Spent 596.00 ms on a formula simplification that was a NOOP. DAG size: 234 [2020-07-20 14:35:50,207 WARN L193 SmtUtils]: Spent 580.00 ms on a formula simplification that was a NOOP. DAG size: 229 [2020-07-20 14:35:51,656 WARN L193 SmtUtils]: Spent 548.00 ms on a formula simplification that was a NOOP. DAG size: 224 [2020-07-20 14:35:53,097 WARN L193 SmtUtils]: Spent 508.00 ms on a formula simplification that was a NOOP. DAG size: 219 [2020-07-20 14:35:54,550 WARN L193 SmtUtils]: Spent 548.00 ms on a formula simplification that was a NOOP. DAG size: 214 [2020-07-20 14:35:56,014 WARN L193 SmtUtils]: Spent 502.00 ms on a formula simplification that was a NOOP. DAG size: 209 [2020-07-20 14:35:57,441 WARN L193 SmtUtils]: Spent 556.00 ms on a formula simplification that was a NOOP. DAG size: 204 [2020-07-20 14:35:58,828 WARN L193 SmtUtils]: Spent 484.00 ms on a formula simplification that was a NOOP. DAG size: 199 [2020-07-20 14:36:00,216 WARN L193 SmtUtils]: Spent 524.00 ms on a formula simplification that was a NOOP. DAG size: 194 [2020-07-20 14:36:01,580 WARN L193 SmtUtils]: Spent 467.00 ms on a formula simplification that was a NOOP. DAG size: 189 [2020-07-20 14:36:02,953 WARN L193 SmtUtils]: Spent 514.00 ms on a formula simplification that was a NOOP. DAG size: 184 [2020-07-20 14:36:04,282 WARN L193 SmtUtils]: Spent 434.00 ms on a formula simplification that was a NOOP. DAG size: 179 [2020-07-20 14:36:05,595 WARN L193 SmtUtils]: Spent 481.00 ms on a formula simplification that was a NOOP. DAG size: 174 [2020-07-20 14:36:06,881 WARN L193 SmtUtils]: Spent 437.00 ms on a formula simplification that was a NOOP. DAG size: 169 [2020-07-20 14:36:08,121 WARN L193 SmtUtils]: Spent 457.00 ms on a formula simplification that was a NOOP. DAG size: 164 [2020-07-20 14:36:09,362 WARN L193 SmtUtils]: Spent 386.00 ms on a formula simplification that was a NOOP. DAG size: 159 [2020-07-20 14:36:10,515 WARN L193 SmtUtils]: Spent 370.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2020-07-20 14:36:11,807 WARN L193 SmtUtils]: Spent 394.00 ms on a formula simplification that was a NOOP. DAG size: 149 [2020-07-20 14:36:12,904 WARN L193 SmtUtils]: Spent 312.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2020-07-20 14:36:14,095 WARN L193 SmtUtils]: Spent 401.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2020-07-20 14:36:15,221 WARN L193 SmtUtils]: Spent 333.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2020-07-20 14:36:16,308 WARN L193 SmtUtils]: Spent 366.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2020-07-20 14:36:17,443 WARN L193 SmtUtils]: Spent 339.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2020-07-20 14:36:18,427 WARN L193 SmtUtils]: Spent 278.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2020-07-20 14:36:19,457 WARN L193 SmtUtils]: Spent 311.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2020-07-20 14:36:20,432 WARN L193 SmtUtils]: Spent 223.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2020-07-20 14:36:21,329 WARN L193 SmtUtils]: Spent 203.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2020-07-20 14:36:22,289 WARN L193 SmtUtils]: Spent 266.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2020-07-20 14:36:23,200 WARN L193 SmtUtils]: Spent 208.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2020-07-20 14:36:24,024 WARN L193 SmtUtils]: Spent 181.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2020-07-20 14:36:24,889 WARN L193 SmtUtils]: Spent 228.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2020-07-20 14:36:25,723 WARN L193 SmtUtils]: Spent 170.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2020-07-20 14:36:26,492 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2020-07-20 14:36:27,214 WARN L193 SmtUtils]: Spent 180.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 14:36:27,997 WARN L193 SmtUtils]: Spent 170.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 14:36:29,373 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 14:36:30,619 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 14:36:35,538 WARN L193 SmtUtils]: Spent 774.00 ms on a formula simplification that was a NOOP. DAG size: 239 [2020-07-20 14:36:35,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:36:35,566 INFO L93 Difference]: Finished difference Result 116 states and 163 transitions. [2020-07-20 14:36:35,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2020-07-20 14:36:35,570 INFO L78 Accepts]: Start accepts. Automaton has 102 states. Word has length 59 [2020-07-20 14:36:35,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:36:35,572 INFO L225 Difference]: With dead ends: 116 [2020-07-20 14:36:35,572 INFO L226 Difference]: Without dead ends: 108 [2020-07-20 14:36:35,579 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1644 ImplicationChecksByTransitivity, 63.0s TimeCoverageRelationStatistics Valid=7334, Invalid=16228, Unknown=0, NotChecked=0, Total=23562 [2020-07-20 14:36:35,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-20 14:36:35,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 108. [2020-07-20 14:36:35,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2020-07-20 14:36:35,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 108 transitions. [2020-07-20 14:36:35,612 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 108 transitions. Word has length 59 [2020-07-20 14:36:35,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:36:35,612 INFO L479 AbstractCegarLoop]: Abstraction has 108 states and 108 transitions. [2020-07-20 14:36:35,613 INFO L480 AbstractCegarLoop]: Interpolant automaton has 102 states. [2020-07-20 14:36:35,613 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 108 transitions. [2020-07-20 14:36:35,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2020-07-20 14:36:35,616 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:36:35,616 INFO L422 BasicCegarLoop]: trace histogram [94, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:36:35,817 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:36:35,818 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:36:35,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:36:35,819 INFO L82 PathProgramCache]: Analyzing trace with hash 1109479102, now seen corresponding path program 6 times [2020-07-20 14:36:35,819 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:36:35,820 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1679372064] [2020-07-20 14:36:35,820 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 14:36:36,026 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:36:36,027 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:36:36,050 WARN L261 TraceCheckSpWp]: Trace formula consists of 698 conjuncts, 577 conjunts are in the unsatisfiable core [2020-07-20 14:36:36,060 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:36:52,274 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:36:52,274 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:36:52,947 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:37:52,312 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:37:52,312 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1679372064] [2020-07-20 14:37:52,313 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:37:52,313 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [101, 101] total 198 [2020-07-20 14:37:52,313 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1272217147] [2020-07-20 14:37:52,314 INFO L459 AbstractCegarLoop]: Interpolant automaton has 198 states [2020-07-20 14:37:52,314 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:37:52,317 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 198 interpolants. [2020-07-20 14:37:52,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9426, Invalid=29580, Unknown=0, NotChecked=0, Total=39006 [2020-07-20 14:37:52,326 INFO L87 Difference]: Start difference. First operand 108 states and 108 transitions. Second operand 198 states. [2020-07-20 14:38:47,303 WARN L193 SmtUtils]: Spent 4.74 s on a formula simplification that was a NOOP. DAG size: 484 [2020-07-20 14:38:55,310 WARN L193 SmtUtils]: Spent 6.35 s on a formula simplification. DAG size of input: 482 DAG size of output: 388 [2020-07-20 14:39:23,629 WARN L193 SmtUtils]: Spent 5.43 s on a formula simplification that was a NOOP. DAG size: 479 [2020-07-20 14:39:31,275 WARN L193 SmtUtils]: Spent 6.56 s on a formula simplification. DAG size of input: 481 DAG size of output: 387 [2020-07-20 14:40:03,299 WARN L193 SmtUtils]: Spent 5.80 s on a formula simplification that was a NOOP. DAG size: 474 [2020-07-20 14:40:38,716 WARN L193 SmtUtils]: Spent 5.96 s on a formula simplification that was a NOOP. DAG size: 469 [2020-07-20 14:41:14,158 WARN L193 SmtUtils]: Spent 6.11 s on a formula simplification that was a NOOP. DAG size: 464 [2020-07-20 14:41:50,916 WARN L193 SmtUtils]: Spent 6.41 s on a formula simplification that was a NOOP. DAG size: 459 [2020-07-20 14:42:28,132 WARN L193 SmtUtils]: Spent 6.61 s on a formula simplification that was a NOOP. DAG size: 454 [2020-07-20 14:43:07,364 WARN L193 SmtUtils]: Spent 6.76 s on a formula simplification that was a NOOP. DAG size: 449 [2020-07-20 14:43:47,542 WARN L193 SmtUtils]: Spent 6.82 s on a formula simplification that was a NOOP. DAG size: 444 [2020-07-20 14:44:28,264 WARN L193 SmtUtils]: Spent 6.67 s on a formula simplification that was a NOOP. DAG size: 439 [2020-07-20 14:45:10,548 WARN L193 SmtUtils]: Spent 7.18 s on a formula simplification that was a NOOP. DAG size: 434 [2020-07-20 14:45:53,177 WARN L193 SmtUtils]: Spent 7.02 s on a formula simplification that was a NOOP. DAG size: 429 [2020-07-20 14:46:36,145 WARN L193 SmtUtils]: Spent 7.18 s on a formula simplification that was a NOOP. DAG size: 424 [2020-07-20 14:47:19,296 WARN L193 SmtUtils]: Spent 7.18 s on a formula simplification that was a NOOP. DAG size: 419 [2020-07-20 14:47:57,398 WARN L193 SmtUtils]: Spent 6.62 s on a formula simplification that was a NOOP. DAG size: 414 [2020-07-20 14:48:26,813 WARN L193 SmtUtils]: Spent 4.35 s on a formula simplification that was a NOOP. DAG size: 409 [2020-07-20 14:48:46,425 WARN L193 SmtUtils]: Spent 3.25 s on a formula simplification that was a NOOP. DAG size: 404 [2020-07-20 14:49:04,032 WARN L193 SmtUtils]: Spent 3.12 s on a formula simplification that was a NOOP. DAG size: 399 [2020-07-20 14:49:21,390 WARN L193 SmtUtils]: Spent 3.04 s on a formula simplification that was a NOOP. DAG size: 394