/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/jm2006.c.i.v+cfa-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 17:58:40,761 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 17:58:40,764 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 17:58:40,779 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 17:58:40,780 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 17:58:40,781 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 17:58:40,783 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 17:58:40,786 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 17:58:40,788 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 17:58:40,789 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 17:58:40,790 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 17:58:40,792 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 17:58:40,792 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 17:58:40,793 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 17:58:40,795 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 17:58:40,797 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 17:58:40,798 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 17:58:40,799 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 17:58:40,801 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 17:58:40,804 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 17:58:40,809 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 17:58:40,810 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 17:58:40,814 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 17:58:40,815 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 17:58:40,822 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 17:58:40,842 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 17:58:40,843 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 17:58:40,846 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 17:58:40,847 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 17:58:40,881 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 17:58:40,882 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 17:58:40,885 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 17:58:40,886 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 17:58:40,886 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 17:58:40,886 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 17:58:40,886 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 17:58:40,886 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 17:58:40,887 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 17:58:40,887 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 17:58:40,888 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 17:58:40,888 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 17:58:40,889 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 17:58:40,889 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 17:58:40,889 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 17:58:40,890 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 17:58:40,890 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 17:58:40,890 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 17:58:40,890 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 17:58:40,891 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 17:58:40,891 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 17:58:40,891 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 17:58:40,891 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 17:58:40,892 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 17:58:40,892 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 17:58:40,892 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 17:58:40,892 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:58:40,892 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 17:58:40,892 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 17:58:40,893 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 17:58:41,257 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 17:58:41,274 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 17:58:41,279 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 17:58:41,280 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 17:58:41,281 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 17:58:41,282 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/jm2006.c.i.v+cfa-reducer.c [2020-07-20 17:58:41,364 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a3bd677b6/33e3f7b5ca6d4e9ca6cbac8619e50dd6/FLAGfb1322502 [2020-07-20 17:58:41,905 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 17:58:41,906 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-lit/jm2006.c.i.v+cfa-reducer.c [2020-07-20 17:58:41,918 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a3bd677b6/33e3f7b5ca6d4e9ca6cbac8619e50dd6/FLAGfb1322502 [2020-07-20 17:58:42,221 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a3bd677b6/33e3f7b5ca6d4e9ca6cbac8619e50dd6 [2020-07-20 17:58:42,238 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 17:58:42,242 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 17:58:42,246 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 17:58:42,247 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 17:58:42,251 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 17:58:42,253 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:58:42" (1/1) ... [2020-07-20 17:58:42,257 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7ce62960 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:58:42, skipping insertion in model container [2020-07-20 17:58:42,257 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:58:42" (1/1) ... [2020-07-20 17:58:42,269 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 17:58:42,301 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 17:58:42,524 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:58:42,531 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 17:58:42,553 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:58:42,570 INFO L208 MainTranslator]: Completed translation [2020-07-20 17:58:42,571 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:58:42 WrapperNode [2020-07-20 17:58:42,571 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 17:58:42,572 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 17:58:42,572 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 17:58:42,573 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 17:58:42,586 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:58:42" (1/1) ... [2020-07-20 17:58:42,587 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:58:42" (1/1) ... [2020-07-20 17:58:42,594 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:58:42" (1/1) ... [2020-07-20 17:58:42,594 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:58:42" (1/1) ... [2020-07-20 17:58:42,693 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:58:42" (1/1) ... [2020-07-20 17:58:42,696 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:58:42" (1/1) ... [2020-07-20 17:58:42,698 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:58:42" (1/1) ... [2020-07-20 17:58:42,700 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 17:58:42,701 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 17:58:42,701 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 17:58:42,701 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 17:58:42,703 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:58:42" (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 17:58:42,774 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 17:58:42,774 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 17:58:42,774 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 17:58:42,774 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 17:58:42,775 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 17:58:42,775 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 17:58:42,775 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 17:58:42,775 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 17:58:42,775 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 17:58:42,775 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 17:58:42,776 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 17:58:42,776 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 17:58:43,046 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 17:58:43,046 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 17:58:43,054 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:58:43 BoogieIcfgContainer [2020-07-20 17:58:43,055 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 17:58:43,058 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 17:58:43,058 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 17:58:43,062 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 17:58:43,063 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 05:58:42" (1/3) ... [2020-07-20 17:58:43,064 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1db2161b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:58:43, skipping insertion in model container [2020-07-20 17:58:43,064 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:58:42" (2/3) ... [2020-07-20 17:58:43,066 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1db2161b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:58:43, skipping insertion in model container [2020-07-20 17:58:43,066 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:58:43" (3/3) ... [2020-07-20 17:58:43,071 INFO L109 eAbstractionObserver]: Analyzing ICFG jm2006.c.i.v+cfa-reducer.c [2020-07-20 17:58:43,085 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 17:58:43,095 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 17:58:43,109 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 17:58:43,140 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 17:58:43,141 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 17:58:43,141 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 17:58:43,141 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 17:58:43,142 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 17:58:43,142 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 17:58:43,143 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 17:58:43,143 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 17:58:43,163 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-07-20 17:58:43,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-07-20 17:58:43,172 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:58:43,174 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:58:43,174 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:58:43,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:58:43,181 INFO L82 PathProgramCache]: Analyzing trace with hash -1434042835, now seen corresponding path program 1 times [2020-07-20 17:58:43,189 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:58:43,190 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [977168329] [2020-07-20 17:58:43,191 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 17:58:43,295 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:58:43,296 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:58:43,301 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-20 17:58:43,313 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:58:43,447 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:58:43,454 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-20 17:58:43,481 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 17:58:43,481 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:58:43,482 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [977168329] [2020-07-20 17:58:43,484 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:58:43,484 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 17:58:43,485 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1056193517] [2020-07-20 17:58:43,492 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 17:58:43,493 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:58:43,508 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 17:58:43,509 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 17:58:43,511 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 5 states. [2020-07-20 17:58:43,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:58:43,672 INFO L93 Difference]: Finished difference Result 30 states and 36 transitions. [2020-07-20 17:58:43,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 17:58:43,675 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-07-20 17:58:43,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:58:43,688 INFO L225 Difference]: With dead ends: 30 [2020-07-20 17:58:43,688 INFO L226 Difference]: Without dead ends: 14 [2020-07-20 17:58:43,693 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-07-20 17:58:43,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-07-20 17:58:43,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-07-20 17:58:43,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-07-20 17:58:43,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-07-20 17:58:43,749 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-07-20 17:58:43,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:58:43,750 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-07-20 17:58:43,750 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 17:58:43,751 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-07-20 17:58:43,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 17:58:43,752 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:58:43,752 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:58:43,968 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:58:43,969 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:58:43,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:58:43,970 INFO L82 PathProgramCache]: Analyzing trace with hash -1507594220, now seen corresponding path program 1 times [2020-07-20 17:58:43,971 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:58:43,971 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [347533438] [2020-07-20 17:58:43,971 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 17:58:44,024 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:58:44,024 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:58:44,026 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 17:58:44,028 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:58:44,093 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 17:58:44,093 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:58:44,115 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:58:44,188 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 17:58:44,189 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [347533438] [2020-07-20 17:58:44,189 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:58:44,190 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 9 [2020-07-20 17:58:44,190 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2075184060] [2020-07-20 17:58:44,192 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 17:58:44,193 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:58:44,193 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 17:58:44,194 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 17:58:44,194 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 9 states. [2020-07-20 17:58:44,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:58:44,427 INFO L93 Difference]: Finished difference Result 23 states and 25 transitions. [2020-07-20 17:58:44,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 17:58:44,428 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 13 [2020-07-20 17:58:44,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:58:44,429 INFO L225 Difference]: With dead ends: 23 [2020-07-20 17:58:44,429 INFO L226 Difference]: Without dead ends: 17 [2020-07-20 17:58:44,431 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=119, Unknown=0, NotChecked=0, Total=182 [2020-07-20 17:58:44,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-07-20 17:58:44,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-07-20 17:58:44,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-07-20 17:58:44,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-07-20 17:58:44,439 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 13 [2020-07-20 17:58:44,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:58:44,440 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-07-20 17:58:44,440 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 17:58:44,440 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-07-20 17:58:44,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-20 17:58:44,441 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:58:44,441 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:58:44,656 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:58:44,657 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:58:44,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:58:44,658 INFO L82 PathProgramCache]: Analyzing trace with hash 2102853613, now seen corresponding path program 2 times [2020-07-20 17:58:44,658 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:58:44,659 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [320395184] [2020-07-20 17:58:44,659 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 17:58:44,702 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:58:44,703 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:58:44,705 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-20 17:58:44,707 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:58:44,831 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 17:58:44,831 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:58:44,847 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:58:45,003 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 17:58:45,004 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [320395184] [2020-07-20 17:58:45,004 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:58:45,004 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 15 [2020-07-20 17:58:45,005 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1187985804] [2020-07-20 17:58:45,005 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 17:58:45,006 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:58:45,006 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 17:58:45,007 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=155, Unknown=0, NotChecked=0, Total=210 [2020-07-20 17:58:45,007 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 15 states. [2020-07-20 17:58:45,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:58:45,654 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-07-20 17:58:45,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-20 17:58:45,655 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 16 [2020-07-20 17:58:45,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:58:45,656 INFO L225 Difference]: With dead ends: 29 [2020-07-20 17:58:45,656 INFO L226 Difference]: Without dead ends: 23 [2020-07-20 17:58:45,658 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=178, Invalid=374, Unknown=0, NotChecked=0, Total=552 [2020-07-20 17:58:45,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-20 17:58:45,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-07-20 17:58:45,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-07-20 17:58:45,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-07-20 17:58:45,674 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 16 [2020-07-20 17:58:45,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:58:45,674 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-07-20 17:58:45,674 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 17:58:45,675 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-07-20 17:58:45,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 17:58:45,676 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:58:45,677 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:58:45,878 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:58:45,879 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:58:45,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:58:45,881 INFO L82 PathProgramCache]: Analyzing trace with hash 906772109, now seen corresponding path program 3 times [2020-07-20 17:58:45,881 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:58:45,882 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1100001892] [2020-07-20 17:58:45,882 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 17:58:45,949 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:58:45,949 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:58:45,952 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 51 conjunts are in the unsatisfiable core [2020-07-20 17:58:45,958 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:58:46,258 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 17:58:46,258 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:58:46,288 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:58:46,773 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 17:58:46,774 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1100001892] [2020-07-20 17:58:46,775 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:58:46,775 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 27 [2020-07-20 17:58:46,776 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1424047059] [2020-07-20 17:58:46,777 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 17:58:46,777 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:58:46,778 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 17:58:46,780 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=527, Unknown=0, NotChecked=0, Total=702 [2020-07-20 17:58:46,781 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 27 states. [2020-07-20 17:58:47,461 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 50 [2020-07-20 17:58:47,767 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 52 [2020-07-20 17:58:48,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:58:48,574 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-20 17:58:48,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-07-20 17:58:48,575 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 22 [2020-07-20 17:58:48,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:58:48,576 INFO L225 Difference]: With dead ends: 41 [2020-07-20 17:58:48,576 INFO L226 Difference]: Without dead ends: 35 [2020-07-20 17:58:48,578 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 154 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=550, Invalid=1172, Unknown=0, NotChecked=0, Total=1722 [2020-07-20 17:58:48,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-07-20 17:58:48,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-07-20 17:58:48,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 17:58:48,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-07-20 17:58:48,587 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 22 [2020-07-20 17:58:48,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:58:48,587 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-07-20 17:58:48,587 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 17:58:48,587 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-07-20 17:58:48,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-07-20 17:58:48,589 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:58:48,589 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:58:48,791 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:58:48,792 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:58:48,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:58:48,793 INFO L82 PathProgramCache]: Analyzing trace with hash -1007922227, now seen corresponding path program 4 times [2020-07-20 17:58:48,794 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:58:48,794 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1153428793] [2020-07-20 17:58:48,795 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 17:58:48,868 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:58:48,869 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:58:48,871 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 99 conjunts are in the unsatisfiable core [2020-07-20 17:58:48,875 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:58:49,545 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 17:58:49,545 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:58:49,582 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:58:51,021 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 17:58:51,022 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1153428793] [2020-07-20 17:58:51,022 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:58:51,022 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 51 [2020-07-20 17:58:51,023 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [646345291] [2020-07-20 17:58:51,023 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2020-07-20 17:58:51,024 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:58:51,024 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2020-07-20 17:58:51,026 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=631, Invalid=1919, Unknown=0, NotChecked=0, Total=2550 [2020-07-20 17:58:51,026 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 51 states. [2020-07-20 17:58:51,963 WARN L193 SmtUtils]: Spent 168.00 ms on a formula simplification that was a NOOP. DAG size: 122 [2020-07-20 17:58:52,333 WARN L193 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 117 [2020-07-20 17:58:52,693 WARN L193 SmtUtils]: Spent 283.00 ms on a formula simplification. DAG size of input: 120 DAG size of output: 98 [2020-07-20 17:58:53,056 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 112 [2020-07-20 17:58:53,445 WARN L193 SmtUtils]: Spent 315.00 ms on a formula simplification. DAG size of input: 122 DAG size of output: 100 [2020-07-20 17:58:53,755 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 107 [2020-07-20 17:58:54,061 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 102 [2020-07-20 17:58:54,375 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2020-07-20 17:58:54,659 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-07-20 17:58:54,924 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 87 [2020-07-20 17:58:55,207 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-20 17:58:55,472 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2020-07-20 17:58:58,072 WARN L193 SmtUtils]: Spent 169.00 ms on a formula simplification that was a NOOP. DAG size: 117 [2020-07-20 17:58:58,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:58:58,083 INFO L93 Difference]: Finished difference Result 65 states and 88 transitions. [2020-07-20 17:58:58,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2020-07-20 17:58:58,085 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 34 [2020-07-20 17:58:58,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:58:58,087 INFO L225 Difference]: With dead ends: 65 [2020-07-20 17:58:58,087 INFO L226 Difference]: Without dead ends: 59 [2020-07-20 17:58:58,090 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 472 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=1942, Invalid=4064, Unknown=0, NotChecked=0, Total=6006 [2020-07-20 17:58:58,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-07-20 17:58:58,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2020-07-20 17:58:58,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-07-20 17:58:58,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2020-07-20 17:58:58,106 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 34 [2020-07-20 17:58:58,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:58:58,107 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2020-07-20 17:58:58,107 INFO L480 AbstractCegarLoop]: Interpolant automaton has 51 states. [2020-07-20 17:58:58,107 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2020-07-20 17:58:58,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-07-20 17:58:58,109 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:58:58,109 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:58:58,323 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:58:58,325 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:58:58,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:58:58,325 INFO L82 PathProgramCache]: Analyzing trace with hash -765796787, now seen corresponding path program 5 times [2020-07-20 17:58:58,326 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:58:58,326 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1716253281] [2020-07-20 17:58:58,327 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 17:58:58,446 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:58:58,447 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:58:58,455 INFO L263 TraceCheckSpWp]: Trace formula consists of 461 conjuncts, 195 conjunts are in the unsatisfiable core [2020-07-20 17:58:58,460 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:59:00,919 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 17:59:00,919 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:59:01,000 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:59:06,956 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 17:59:06,956 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1716253281] [2020-07-20 17:59:06,959 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:59:06,960 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51] total 99 [2020-07-20 17:59:06,960 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1724755627] [2020-07-20 17:59:06,961 INFO L459 AbstractCegarLoop]: Interpolant automaton has 99 states [2020-07-20 17:59:06,961 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:59:06,963 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2020-07-20 17:59:06,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2407, Invalid=7295, Unknown=0, NotChecked=0, Total=9702 [2020-07-20 17:59:06,966 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 99 states. [2020-07-20 17:59:10,643 WARN L193 SmtUtils]: Spent 458.00 ms on a formula simplification that was a NOOP. DAG size: 242 [2020-07-20 17:59:12,052 WARN L193 SmtUtils]: Spent 474.00 ms on a formula simplification that was a NOOP. DAG size: 237 [2020-07-20 17:59:13,016 WARN L193 SmtUtils]: Spent 768.00 ms on a formula simplification. DAG size of input: 240 DAG size of output: 194 [2020-07-20 17:59:14,424 WARN L193 SmtUtils]: Spent 488.00 ms on a formula simplification that was a NOOP. DAG size: 232 [2020-07-20 17:59:15,435 WARN L193 SmtUtils]: Spent 803.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 196 [2020-07-20 17:59:16,731 WARN L193 SmtUtils]: Spent 448.00 ms on a formula simplification that was a NOOP. DAG size: 227 [2020-07-20 17:59:18,033 WARN L193 SmtUtils]: Spent 440.00 ms on a formula simplification that was a NOOP. DAG size: 222 [2020-07-20 17:59:19,294 WARN L193 SmtUtils]: Spent 431.00 ms on a formula simplification that was a NOOP. DAG size: 217 [2020-07-20 17:59:20,554 WARN L193 SmtUtils]: Spent 413.00 ms on a formula simplification that was a NOOP. DAG size: 212 [2020-07-20 17:59:21,787 WARN L193 SmtUtils]: Spent 406.00 ms on a formula simplification that was a NOOP. DAG size: 207 [2020-07-20 17:59:22,991 WARN L193 SmtUtils]: Spent 390.00 ms on a formula simplification that was a NOOP. DAG size: 202 [2020-07-20 17:59:24,197 WARN L193 SmtUtils]: Spent 379.00 ms on a formula simplification that was a NOOP. DAG size: 197 [2020-07-20 17:59:25,378 WARN L193 SmtUtils]: Spent 384.00 ms on a formula simplification that was a NOOP. DAG size: 192 [2020-07-20 17:59:26,529 WARN L193 SmtUtils]: Spent 367.00 ms on a formula simplification that was a NOOP. DAG size: 187 [2020-07-20 17:59:27,656 WARN L193 SmtUtils]: Spent 349.00 ms on a formula simplification that was a NOOP. DAG size: 182 [2020-07-20 17:59:28,731 WARN L193 SmtUtils]: Spent 338.00 ms on a formula simplification that was a NOOP. DAG size: 177 [2020-07-20 17:59:29,787 WARN L193 SmtUtils]: Spent 335.00 ms on a formula simplification that was a NOOP. DAG size: 172 [2020-07-20 17:59:30,825 WARN L193 SmtUtils]: Spent 314.00 ms on a formula simplification that was a NOOP. DAG size: 167 [2020-07-20 17:59:31,863 WARN L193 SmtUtils]: Spent 301.00 ms on a formula simplification that was a NOOP. DAG size: 162 [2020-07-20 17:59:32,852 WARN L193 SmtUtils]: Spent 299.00 ms on a formula simplification that was a NOOP. DAG size: 157 [2020-07-20 17:59:33,834 WARN L193 SmtUtils]: Spent 284.00 ms on a formula simplification that was a NOOP. DAG size: 152 [2020-07-20 17:59:34,851 WARN L193 SmtUtils]: Spent 282.00 ms on a formula simplification that was a NOOP. DAG size: 147 [2020-07-20 17:59:35,819 WARN L193 SmtUtils]: Spent 282.00 ms on a formula simplification that was a NOOP. DAG size: 142 [2020-07-20 17:59:36,721 WARN L193 SmtUtils]: Spent 252.00 ms on a formula simplification that was a NOOP. DAG size: 137 [2020-07-20 17:59:37,662 WARN L193 SmtUtils]: Spent 243.00 ms on a formula simplification that was a NOOP. DAG size: 132 [2020-07-20 17:59:38,531 WARN L193 SmtUtils]: Spent 230.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2020-07-20 17:59:39,389 WARN L193 SmtUtils]: Spent 220.00 ms on a formula simplification that was a NOOP. DAG size: 122 [2020-07-20 17:59:40,228 WARN L193 SmtUtils]: Spent 215.00 ms on a formula simplification that was a NOOP. DAG size: 117 [2020-07-20 17:59:41,023 WARN L193 SmtUtils]: Spent 192.00 ms on a formula simplification that was a NOOP. DAG size: 112 [2020-07-20 17:59:41,812 WARN L193 SmtUtils]: Spent 199.00 ms on a formula simplification that was a NOOP. DAG size: 107 [2020-07-20 17:59:42,568 WARN L193 SmtUtils]: Spent 176.00 ms on a formula simplification that was a NOOP. DAG size: 102 [2020-07-20 17:59:43,297 WARN L193 SmtUtils]: Spent 158.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2020-07-20 17:59:44,012 WARN L193 SmtUtils]: Spent 158.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-07-20 17:59:44,713 WARN L193 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 87 [2020-07-20 17:59:45,388 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-20 17:59:46,046 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2020-07-20 17:59:46,684 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2020-07-20 17:59:47,306 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-20 17:59:47,889 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-20 17:59:53,972 WARN L193 SmtUtils]: Spent 594.00 ms on a formula simplification that was a NOOP. DAG size: 237 [2020-07-20 17:59:53,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:59:53,991 INFO L93 Difference]: Finished difference Result 113 states and 160 transitions. [2020-07-20 17:59:53,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 101 states. [2020-07-20 17:59:53,992 INFO L78 Accepts]: Start accepts. Automaton has 99 states. Word has length 58 [2020-07-20 17:59:53,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:59:53,995 INFO L225 Difference]: With dead ends: 113 [2020-07-20 17:59:53,995 INFO L226 Difference]: Without dead ends: 107 [2020-07-20 17:59:54,001 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1540 ImplicationChecksByTransitivity, 51.6s TimeCoverageRelationStatistics Valid=7318, Invalid=15032, Unknown=0, NotChecked=0, Total=22350 [2020-07-20 17:59:54,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2020-07-20 17:59:54,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2020-07-20 17:59:54,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-07-20 17:59:54,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 107 transitions. [2020-07-20 17:59:54,038 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 107 transitions. Word has length 58 [2020-07-20 17:59:54,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:59:54,038 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 107 transitions. [2020-07-20 17:59:54,039 INFO L480 AbstractCegarLoop]: Interpolant automaton has 99 states. [2020-07-20 17:59:54,039 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 107 transitions. [2020-07-20 17:59:54,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-07-20 17:59:54,043 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:59:54,043 INFO L422 BasicCegarLoop]: trace histogram [94, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:59:54,257 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:59:54,259 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:59:54,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:59:54,259 INFO L82 PathProgramCache]: Analyzing trace with hash 1152480077, now seen corresponding path program 6 times [2020-07-20 17:59:54,260 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:59:54,260 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1840331477] [2020-07-20 17:59:54,261 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 17:59:54,499 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:59:54,499 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:59:54,518 INFO L263 TraceCheckSpWp]: Trace formula consists of 893 conjuncts, 387 conjunts are in the unsatisfiable core [2020-07-20 17:59:54,527 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:00:07,472 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 18:00:07,472 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:00:07,743 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 18:00:47,786 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 18:00:47,787 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1840331477] [2020-07-20 18:00:47,787 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 18:00:47,787 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [99, 99] total 195 [2020-07-20 18:00:47,787 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1493015488] [2020-07-20 18:00:47,788 INFO L459 AbstractCegarLoop]: Interpolant automaton has 195 states [2020-07-20 18:00:47,789 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:00:47,791 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 195 interpolants. [2020-07-20 18:00:47,798 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9415, Invalid=28415, Unknown=0, NotChecked=0, Total=37830 [2020-07-20 18:00:47,799 INFO L87 Difference]: Start difference. First operand 107 states and 107 transitions. Second operand 195 states. [2020-07-20 18:01:21,706 WARN L193 SmtUtils]: Spent 2.58 s on a formula simplification that was a NOOP. DAG size: 482 [2020-07-20 18:01:38,925 WARN L193 SmtUtils]: Spent 2.97 s on a formula simplification that was a NOOP. DAG size: 477 [2020-07-20 18:01:44,484 WARN L193 SmtUtils]: Spent 4.66 s on a formula simplification. DAG size of input: 480 DAG size of output: 386 [2020-07-20 18:02:04,073 WARN L193 SmtUtils]: Spent 3.29 s on a formula simplification that was a NOOP. DAG size: 472 [2020-07-20 18:02:10,310 WARN L193 SmtUtils]: Spent 5.27 s on a formula simplification. DAG size of input: 482 DAG size of output: 388 [2020-07-20 18:02:33,013 WARN L193 SmtUtils]: Spent 3.68 s on a formula simplification that was a NOOP. DAG size: 467 [2020-07-20 18:02:57,391 WARN L193 SmtUtils]: Spent 3.90 s on a formula simplification that was a NOOP. DAG size: 462 [2020-07-20 18:03:23,608 WARN L193 SmtUtils]: Spent 4.12 s on a formula simplification that was a NOOP. DAG size: 457 [2020-07-20 18:03:51,310 WARN L193 SmtUtils]: Spent 4.38 s on a formula simplification that was a NOOP. DAG size: 452 [2020-07-20 18:04:12,883 WARN L193 SmtUtils]: Spent 3.45 s on a formula simplification that was a NOOP. DAG size: 447 [2020-07-20 18:04:38,043 WARN L193 SmtUtils]: Spent 4.72 s on a formula simplification that was a NOOP. DAG size: 442 [2020-07-20 18:05:10,695 WARN L193 SmtUtils]: Spent 4.85 s on a formula simplification that was a NOOP. DAG size: 437 [2020-07-20 18:05:44,656 WARN L193 SmtUtils]: Spent 4.74 s on a formula simplification that was a NOOP. DAG size: 432 [2020-07-20 18:06:10,244 WARN L193 SmtUtils]: Spent 3.65 s on a formula simplification that was a NOOP. DAG size: 427 [2020-07-20 18:06:44,042 WARN L193 SmtUtils]: Spent 5.18 s on a formula simplification that was a NOOP. DAG size: 422 [2020-07-20 18:07:19,275 WARN L193 SmtUtils]: Spent 5.26 s on a formula simplification that was a NOOP. DAG size: 417 [2020-07-20 18:07:51,776 WARN L193 SmtUtils]: Spent 4.09 s on a formula simplification that was a NOOP. DAG size: 412 [2020-07-20 18:08:27,625 WARN L193 SmtUtils]: Spent 5.24 s on a formula simplification that was a NOOP. DAG size: 407 [2020-07-20 18:09:04,172 WARN L193 SmtUtils]: Spent 5.33 s on a formula simplification that was a NOOP. DAG size: 402 [2020-07-20 18:09:36,766 WARN L193 SmtUtils]: Spent 4.07 s on a formula simplification that was a NOOP. DAG size: 397 [2020-07-20 18:10:03,671 WARN L193 SmtUtils]: Spent 3.23 s on a formula simplification that was a NOOP. DAG size: 392 [2020-07-20 18:10:24,036 WARN L193 SmtUtils]: Spent 3.15 s on a formula simplification that was a NOOP. DAG size: 387 [2020-07-20 18:10:45,948 WARN L193 SmtUtils]: Spent 3.38 s on a formula simplification that was a NOOP. DAG size: 382 [2020-07-20 18:11:05,511 WARN L193 SmtUtils]: Spent 2.84 s on a formula simplification that was a NOOP. DAG size: 377 [2020-07-20 18:11:23,180 WARN L193 SmtUtils]: Spent 2.80 s on a formula simplification that was a NOOP. DAG size: 372 [2020-07-20 18:11:42,933 WARN L193 SmtUtils]: Spent 2.92 s on a formula simplification that was a NOOP. DAG size: 367 [2020-07-20 18:12:04,682 WARN L193 SmtUtils]: Spent 3.14 s on a formula simplification that was a NOOP. DAG size: 362 [2020-07-20 18:12:26,465 WARN L193 SmtUtils]: Spent 3.26 s on a formula simplification that was a NOOP. DAG size: 357 [2020-07-20 18:12:47,823 WARN L193 SmtUtils]: Spent 2.92 s on a formula simplification that was a NOOP. DAG size: 352 [2020-07-20 18:13:06,534 WARN L193 SmtUtils]: Spent 2.84 s on a formula simplification that was a NOOP. DAG size: 347