/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 BIGGEST_EQUIVALENCE_CLASS --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/nla-digbench/mannadiv.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 02:14:07,862 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 02:14:07,865 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 02:14:07,885 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 02:14:07,886 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 02:14:07,888 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 02:14:07,890 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 02:14:07,892 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 02:14:07,894 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 02:14:07,895 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 02:14:07,896 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 02:14:07,897 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 02:14:07,897 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 02:14:07,899 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 02:14:07,900 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 02:14:07,901 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 02:14:07,902 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 02:14:07,903 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 02:14:07,905 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 02:14:07,907 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 02:14:07,908 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 02:14:07,910 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 02:14:07,911 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 02:14:07,912 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 02:14:07,914 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 02:14:07,923 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 02:14:07,924 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 02:14:07,925 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 02:14:07,925 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 [2020-07-21 02:14:07,941 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 02:14:07,941 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 02:14:07,942 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 02:14:07,942 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 02:14:07,943 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 02:14:07,943 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 02:14:07,943 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 02:14:07,943 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 02:14:07,944 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 02:14:07,944 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 02:14:07,944 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 02:14:07,944 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 02:14:07,944 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 02:14:07,944 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 02:14:07,945 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 02:14:07,945 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 02:14:07,945 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 02:14:07,945 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 02:14:07,945 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 02:14:07,946 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 02:14:07,946 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 02:14:07,946 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 02:14:07,946 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 02:14:07,947 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 02:14:07,947 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 02:14:07,947 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 02:14:07,947 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 02:14:07,947 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 02:14:07,948 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 02:14:07,948 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 -> BIGGEST_EQUIVALENCE_CLASS 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 [2020-07-21 02:14:08,253 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 02:14:08,266 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 02:14:08,269 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 02:14:08,271 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 02:14:08,272 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 02:14:08,272 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench/mannadiv.c [2020-07-21 02:14:08,337 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/da4ae0ba2/6e7f279fe907495982ee09492cdb7ef1/FLAGcc32ec7af [2020-07-21 02:14:08,830 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 02:14:08,831 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/mannadiv.c [2020-07-21 02:14:08,838 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/da4ae0ba2/6e7f279fe907495982ee09492cdb7ef1/FLAGcc32ec7af [2020-07-21 02:14:09,249 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/da4ae0ba2/6e7f279fe907495982ee09492cdb7ef1 [2020-07-21 02:14:09,258 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 02:14:09,261 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 02:14:09,262 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 02:14:09,263 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 02:14:09,268 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 02:14:09,269 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 02:14:09" (1/1) ... [2020-07-21 02:14:09,272 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1a926594 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:14:09, skipping insertion in model container [2020-07-21 02:14:09,273 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 02:14:09" (1/1) ... [2020-07-21 02:14:09,282 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 02:14:09,305 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 02:14:09,502 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 02:14:09,506 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 02:14:09,527 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 02:14:09,543 INFO L208 MainTranslator]: Completed translation [2020-07-21 02:14:09,543 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:14:09 WrapperNode [2020-07-21 02:14:09,544 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 02:14:09,545 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 02:14:09,545 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 02:14:09,545 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 02:14:09,560 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:14:09" (1/1) ... [2020-07-21 02:14:09,561 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:14:09" (1/1) ... [2020-07-21 02:14:09,659 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:14:09" (1/1) ... [2020-07-21 02:14:09,660 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:14:09" (1/1) ... [2020-07-21 02:14:09,670 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:14:09" (1/1) ... [2020-07-21 02:14:09,674 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:14:09" (1/1) ... [2020-07-21 02:14:09,675 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:14:09" (1/1) ... [2020-07-21 02:14:09,677 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 02:14:09,678 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 02:14:09,678 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 02:14:09,678 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 02:14:09,679 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:14:09" (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 [2020-07-21 02:14:09,746 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 02:14:09,746 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 02:14:09,746 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 02:14:09,746 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 02:14:09,746 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 02:14:09,746 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 02:14:09,747 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 02:14:09,747 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 02:14:09,747 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 02:14:09,747 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 02:14:09,747 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 02:14:09,747 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 02:14:09,748 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 02:14:09,955 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 02:14:09,955 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 02:14:09,960 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 02:14:09 BoogieIcfgContainer [2020-07-21 02:14:09,960 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 02:14:09,961 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 02:14:09,961 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 02:14:09,965 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 02:14:09,965 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 02:14:09" (1/3) ... [2020-07-21 02:14:09,966 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1788a6e9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 02:14:09, skipping insertion in model container [2020-07-21 02:14:09,966 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:14:09" (2/3) ... [2020-07-21 02:14:09,967 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1788a6e9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 02:14:09, skipping insertion in model container [2020-07-21 02:14:09,967 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 02:14:09" (3/3) ... [2020-07-21 02:14:09,969 INFO L109 eAbstractionObserver]: Analyzing ICFG mannadiv.c [2020-07-21 02:14:09,981 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 02:14:09,989 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 02:14:10,008 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 02:14:10,040 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 02:14:10,040 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 02:14:10,040 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 02:14:10,041 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 02:14:10,041 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 02:14:10,041 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 02:14:10,042 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 02:14:10,042 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 02:14:10,071 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states. [2020-07-21 02:14:10,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 02:14:10,081 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 02:14:10,082 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 02:14:10,083 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 02:14:10,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 02:14:10,091 INFO L82 PathProgramCache]: Analyzing trace with hash -849943384, now seen corresponding path program 1 times [2020-07-21 02:14:10,101 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 02:14:10,102 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1019318010] [2020-07-21 02:14:10,102 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 [2020-07-21 02:14:10,206 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 02:14:10,207 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 02:14:10,209 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-21 02:14:10,216 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 02:14:10,243 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 02:14:10,244 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 02:14:10,245 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1019318010] [2020-07-21 02:14:10,246 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 02:14:10,247 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-21 02:14:10,248 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [121321591] [2020-07-21 02:14:10,252 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-21 02:14:10,252 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 02:14:10,263 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-21 02:14:10,265 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 02:14:10,267 INFO L87 Difference]: Start difference. First operand 28 states. Second operand 2 states. [2020-07-21 02:14:10,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 02:14:10,297 INFO L93 Difference]: Finished difference Result 50 states and 67 transitions. [2020-07-21 02:14:10,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-21 02:14:10,299 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 21 [2020-07-21 02:14:10,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 02:14:10,310 INFO L225 Difference]: With dead ends: 50 [2020-07-21 02:14:10,310 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 02:14:10,314 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 02:14:10,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 02:14:10,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-07-21 02:14:10,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-07-21 02:14:10,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2020-07-21 02:14:10,361 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 21 [2020-07-21 02:14:10,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 02:14:10,362 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2020-07-21 02:14:10,362 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-21 02:14:10,363 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2020-07-21 02:14:10,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 02:14:10,365 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 02:14:10,365 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 02:14:10,579 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 02:14:10,579 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 02:14:10,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 02:14:10,581 INFO L82 PathProgramCache]: Analyzing trace with hash -1193991140, now seen corresponding path program 1 times [2020-07-21 02:14:10,582 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 02:14:10,582 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [106912509] [2020-07-21 02:14:10,582 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 [2020-07-21 02:14:10,634 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 02:14:10,634 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 02:14:10,636 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 02:14:10,639 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 02:14:10,782 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 02:14:10,782 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 02:14:10,783 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [106912509] [2020-07-21 02:14:10,783 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 02:14:10,783 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-21 02:14:10,784 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1194440642] [2020-07-21 02:14:10,786 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 02:14:10,786 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 02:14:10,786 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 02:14:10,787 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-07-21 02:14:10,787 INFO L87 Difference]: Start difference. First operand 23 states and 26 transitions. Second operand 8 states. [2020-07-21 02:14:10,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 02:14:10,950 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2020-07-21 02:14:10,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 02:14:10,951 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2020-07-21 02:14:10,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 02:14:10,953 INFO L225 Difference]: With dead ends: 34 [2020-07-21 02:14:10,953 INFO L226 Difference]: Without dead ends: 32 [2020-07-21 02:14:10,955 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 02:14:10,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-21 02:14:10,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 29. [2020-07-21 02:14:10,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-07-21 02:14:10,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2020-07-21 02:14:10,966 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 21 [2020-07-21 02:14:10,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 02:14:10,968 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2020-07-21 02:14:10,969 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 02:14:10,969 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2020-07-21 02:14:10,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 02:14:10,970 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 02:14:10,970 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 02:14:11,173 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 02:14:11,174 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 02:14:11,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 02:14:11,175 INFO L82 PathProgramCache]: Analyzing trace with hash -1415100442, now seen corresponding path program 1 times [2020-07-21 02:14:11,175 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 02:14:11,176 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1623842802] [2020-07-21 02:14:11,177 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 [2020-07-21 02:14:11,231 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 02:14:11,231 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 02:14:11,232 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 02:14:11,236 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 02:14:11,326 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 02:14:11,326 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 02:14:11,370 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 02:14:11,441 INFO L320 QuantifierPusher]: Applying distributivity to a DISJUNCTION[2, 2, 2, 1] term [2020-07-21 02:14:11,442 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 02:14:11,458 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 02:14:11,508 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 02:14:11,509 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1623842802] [2020-07-21 02:14:11,511 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 02:14:11,511 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 10 [2020-07-21 02:14:11,511 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1778793199] [2020-07-21 02:14:11,512 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 02:14:11,513 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 02:14:11,513 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 02:14:11,513 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-07-21 02:14:11,514 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand 10 states. [2020-07-21 02:14:13,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 02:14:13,695 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2020-07-21 02:14:13,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 02:14:13,697 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-21 02:14:13,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 02:14:13,701 INFO L225 Difference]: With dead ends: 37 [2020-07-21 02:14:13,702 INFO L226 Difference]: Without dead ends: 34 [2020-07-21 02:14:13,702 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 43 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2020-07-21 02:14:13,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-07-21 02:14:13,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 28. [2020-07-21 02:14:13,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-21 02:14:13,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-07-21 02:14:13,720 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 27 [2020-07-21 02:14:13,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 02:14:13,720 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-07-21 02:14:13,720 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 02:14:13,721 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-07-21 02:14:13,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-21 02:14:13,723 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 02:14:13,724 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 02:14:13,936 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 02:14:13,937 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 02:14:13,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 02:14:13,938 INFO L82 PathProgramCache]: Analyzing trace with hash -1831429119, now seen corresponding path program 1 times [2020-07-21 02:14:13,938 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 02:14:13,939 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1821556136] [2020-07-21 02:14:13,939 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 [2020-07-21 02:14:13,978 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 02:14:13,979 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 02:14:13,980 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-21 02:14:13,982 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 02:14:14,034 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 02:14:14,034 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 02:14:14,051 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 02:14:14,135 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 02:14:14,135 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1821556136] [2020-07-21 02:14:14,136 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 02:14:14,136 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2020-07-21 02:14:14,136 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1893492074] [2020-07-21 02:14:14,137 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 02:14:14,137 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 02:14:14,137 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 02:14:14,137 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-07-21 02:14:14,138 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 8 states. [2020-07-21 02:14:18,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 02:14:18,432 INFO L93 Difference]: Finished difference Result 72 states and 84 transitions. [2020-07-21 02:14:18,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 02:14:18,434 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 29 [2020-07-21 02:14:18,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 02:14:18,436 INFO L225 Difference]: With dead ends: 72 [2020-07-21 02:14:18,436 INFO L226 Difference]: Without dead ends: 56 [2020-07-21 02:14:18,437 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 49 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2020-07-21 02:14:18,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-07-21 02:14:18,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-07-21 02:14:18,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 02:14:18,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 65 transitions. [2020-07-21 02:14:18,454 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 65 transitions. Word has length 29 [2020-07-21 02:14:18,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 02:14:18,455 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 65 transitions. [2020-07-21 02:14:18,455 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 02:14:18,455 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 65 transitions. [2020-07-21 02:14:18,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-07-21 02:14:18,457 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 02:14:18,457 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 02:14:18,670 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 02:14:18,671 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 02:14:18,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 02:14:18,672 INFO L82 PathProgramCache]: Analyzing trace with hash 802873865, now seen corresponding path program 1 times [2020-07-21 02:14:18,672 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 02:14:18,673 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1352589654] [2020-07-21 02:14:18,673 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 [2020-07-21 02:14:18,712 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 02:14:18,713 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 02:14:18,714 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 02:14:18,717 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 02:14:18,757 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 16 proven. 8 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 02:14:18,757 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 02:14:18,819 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 16 proven. 8 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 02:14:18,820 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1352589654] [2020-07-21 02:14:18,820 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 02:14:18,820 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2020-07-21 02:14:18,820 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [592481672] [2020-07-21 02:14:18,821 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 02:14:18,822 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 02:14:18,822 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 02:14:18,823 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 02:14:18,824 INFO L87 Difference]: Start difference. First operand 56 states and 65 transitions. Second operand 6 states. [2020-07-21 02:14:18,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 02:14:18,905 INFO L93 Difference]: Finished difference Result 86 states and 103 transitions. [2020-07-21 02:14:18,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 02:14:18,907 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 45 [2020-07-21 02:14:18,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 02:14:18,909 INFO L225 Difference]: With dead ends: 86 [2020-07-21 02:14:18,909 INFO L226 Difference]: Without dead ends: 70 [2020-07-21 02:14:18,909 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 83 SyntacticMatches, 2 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2020-07-21 02:14:18,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-07-21 02:14:18,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2020-07-21 02:14:18,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-21 02:14:18,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2020-07-21 02:14:18,928 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 45 [2020-07-21 02:14:18,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 02:14:18,929 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2020-07-21 02:14:18,929 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 02:14:18,929 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2020-07-21 02:14:18,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-07-21 02:14:18,931 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 02:14:18,931 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 02:14:19,145 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 02:14:19,146 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 02:14:19,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 02:14:19,147 INFO L82 PathProgramCache]: Analyzing trace with hash -208243385, now seen corresponding path program 2 times [2020-07-21 02:14:19,147 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 02:14:19,147 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1813246445] [2020-07-21 02:14:19,148 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 [2020-07-21 02:14:19,186 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 02:14:19,186 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 02:14:19,188 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 25 conjunts are in the unsatisfiable core [2020-07-21 02:14:19,191 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 02:14:19,330 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 6 proven. 18 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 02:14:19,330 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 02:14:19,369 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 02:14:19,611 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 6 proven. 18 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 02:14:19,613 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1813246445] [2020-07-21 02:14:19,613 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 02:14:19,613 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 12 [2020-07-21 02:14:19,614 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2065006330] [2020-07-21 02:14:19,614 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 02:14:19,614 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 02:14:19,615 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 02:14:19,615 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2020-07-21 02:14:19,615 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand 12 states. [2020-07-21 02:14:30,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 02:14:30,422 INFO L93 Difference]: Finished difference Result 124 states and 150 transitions. [2020-07-21 02:14:30,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 02:14:30,452 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 45 [2020-07-21 02:14:30,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 02:14:30,454 INFO L225 Difference]: With dead ends: 124 [2020-07-21 02:14:30,455 INFO L226 Difference]: Without dead ends: 122 [2020-07-21 02:14:30,455 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 77 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=64, Invalid=176, Unknown=0, NotChecked=0, Total=240 [2020-07-21 02:14:30,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2020-07-21 02:14:30,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 112. [2020-07-21 02:14:30,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2020-07-21 02:14:30,481 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 136 transitions. [2020-07-21 02:14:30,482 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 136 transitions. Word has length 45 [2020-07-21 02:14:30,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 02:14:30,482 INFO L479 AbstractCegarLoop]: Abstraction has 112 states and 136 transitions. [2020-07-21 02:14:30,482 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 02:14:30,483 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 136 transitions. [2020-07-21 02:14:30,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-07-21 02:14:30,485 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 02:14:30,485 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 02:14:30,691 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 02:14:30,692 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 02:14:30,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 02:14:30,693 INFO L82 PathProgramCache]: Analyzing trace with hash -53426768, now seen corresponding path program 2 times [2020-07-21 02:14:30,693 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 02:14:30,694 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [227086547] [2020-07-21 02:14:30,694 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 [2020-07-21 02:14:30,736 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 02:14:30,736 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 02:14:30,738 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 29 conjunts are in the unsatisfiable core [2020-07-21 02:14:30,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 02:14:30,985 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 8 proven. 32 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-07-21 02:14:30,985 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 02:14:31,027 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 02:14:31,394 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 8 proven. 32 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-07-21 02:14:31,395 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [227086547] [2020-07-21 02:14:31,395 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 02:14:31,395 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 14 [2020-07-21 02:14:31,396 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1677371702] [2020-07-21 02:14:31,396 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 02:14:31,396 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 02:14:31,397 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 02:14:31,397 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=141, Unknown=0, NotChecked=0, Total=182 [2020-07-21 02:14:31,397 INFO L87 Difference]: Start difference. First operand 112 states and 136 transitions. Second operand 14 states. [2020-07-21 02:14:31,934 WARN L193 SmtUtils]: Spent 350.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 18 [2020-07-21 02:14:32,289 WARN L193 SmtUtils]: Spent 254.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 18 [2020-07-21 02:14:34,966 WARN L193 SmtUtils]: Spent 275.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 18 [2020-07-21 02:14:37,372 WARN L193 SmtUtils]: Spent 2.17 s on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 02:14:37,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 02:14:37,437 INFO L93 Difference]: Finished difference Result 156 states and 183 transitions. [2020-07-21 02:14:37,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 02:14:37,441 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 53 [2020-07-21 02:14:37,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 02:14:37,442 INFO L225 Difference]: With dead ends: 156 [2020-07-21 02:14:37,443 INFO L226 Difference]: Without dead ends: 98 [2020-07-21 02:14:37,444 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 91 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=80, Invalid=262, Unknown=0, NotChecked=0, Total=342 [2020-07-21 02:14:37,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-21 02:14:37,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 98. [2020-07-21 02:14:37,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2020-07-21 02:14:37,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 115 transitions. [2020-07-21 02:14:37,460 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 115 transitions. Word has length 53 [2020-07-21 02:14:37,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 02:14:37,461 INFO L479 AbstractCegarLoop]: Abstraction has 98 states and 115 transitions. [2020-07-21 02:14:37,461 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 02:14:37,461 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 115 transitions. [2020-07-21 02:14:37,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-07-21 02:14:37,463 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 02:14:37,463 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 5, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 02:14:37,677 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 02:14:37,678 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 02:14:37,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 02:14:37,679 INFO L82 PathProgramCache]: Analyzing trace with hash 10333007, now seen corresponding path program 3 times [2020-07-21 02:14:37,680 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 02:14:37,680 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1948483335] [2020-07-21 02:14:37,680 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 02:14:37,717 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 02:14:37,718 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 02:14:37,719 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 02:14:37,721 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 02:14:37,812 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 56 proven. 16 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2020-07-21 02:14:37,812 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 02:14:37,951 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 34 proven. 24 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2020-07-21 02:14:37,952 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1948483335] [2020-07-21 02:14:37,952 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 02:14:37,952 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2020-07-21 02:14:37,952 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1361276139] [2020-07-21 02:14:37,953 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 02:14:37,953 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 02:14:37,954 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 02:14:37,954 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-07-21 02:14:37,954 INFO L87 Difference]: Start difference. First operand 98 states and 115 transitions. Second operand 8 states. [2020-07-21 02:14:38,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 02:14:38,135 INFO L93 Difference]: Finished difference Result 152 states and 180 transitions. [2020-07-21 02:14:38,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 02:14:38,138 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 61 [2020-07-21 02:14:38,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 02:14:38,142 INFO L225 Difference]: With dead ends: 152 [2020-07-21 02:14:38,142 INFO L226 Difference]: Without dead ends: 118 [2020-07-21 02:14:38,143 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-07-21 02:14:38,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-21 02:14:38,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 116. [2020-07-21 02:14:38,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2020-07-21 02:14:38,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 138 transitions. [2020-07-21 02:14:38,188 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 138 transitions. Word has length 61 [2020-07-21 02:14:38,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 02:14:38,192 INFO L479 AbstractCegarLoop]: Abstraction has 116 states and 138 transitions. [2020-07-21 02:14:38,192 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 02:14:38,192 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 138 transitions. [2020-07-21 02:14:38,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-07-21 02:14:38,194 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 02:14:38,194 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 5, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 02:14:38,398 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 02:14:38,398 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 02:14:38,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 02:14:38,399 INFO L82 PathProgramCache]: Analyzing trace with hash -185889457, now seen corresponding path program 4 times [2020-07-21 02:14:38,399 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 02:14:38,400 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [739905539] [2020-07-21 02:14:38,400 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 02:14:38,442 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 02:14:38,443 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 02:14:38,444 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 02:14:38,446 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 02:14:38,496 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 32 proven. 28 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2020-07-21 02:14:38,497 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 02:14:38,591 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 32 proven. 28 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2020-07-21 02:14:38,591 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [739905539] [2020-07-21 02:14:38,591 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 02:14:38,592 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2020-07-21 02:14:38,592 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [352844383] [2020-07-21 02:14:38,592 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 02:14:38,593 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 02:14:38,593 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 02:14:38,593 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-07-21 02:14:38,593 INFO L87 Difference]: Start difference. First operand 116 states and 138 transitions. Second operand 9 states. [2020-07-21 02:14:38,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 02:14:38,772 INFO L93 Difference]: Finished difference Result 134 states and 156 transitions. [2020-07-21 02:14:38,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 02:14:38,775 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 61 [2020-07-21 02:14:38,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 02:14:38,776 INFO L225 Difference]: With dead ends: 134 [2020-07-21 02:14:38,777 INFO L226 Difference]: Without dead ends: 116 [2020-07-21 02:14:38,777 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 111 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-07-21 02:14:38,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2020-07-21 02:14:38,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 116. [2020-07-21 02:14:38,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2020-07-21 02:14:38,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 135 transitions. [2020-07-21 02:14:38,793 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 135 transitions. Word has length 61 [2020-07-21 02:14:38,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 02:14:38,794 INFO L479 AbstractCegarLoop]: Abstraction has 116 states and 135 transitions. [2020-07-21 02:14:38,794 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 02:14:38,794 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 135 transitions. [2020-07-21 02:14:38,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-07-21 02:14:38,796 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 02:14:38,796 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 7, 6, 6, 6, 6, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 02:14:39,005 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 02:14:39,006 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 02:14:39,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 02:14:39,007 INFO L82 PathProgramCache]: Analyzing trace with hash -377856460, now seen corresponding path program 5 times [2020-07-21 02:14:39,008 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 02:14:39,009 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1498844241] [2020-07-21 02:14:39,010 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 02:14:39,055 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 02:14:39,055 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 02:14:39,056 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 33 conjunts are in the unsatisfiable core [2020-07-21 02:14:39,058 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 02:14:39,643 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 12 proven. 72 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-07-21 02:14:39,643 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 02:14:39,760 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 02:14:40,913 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 12 proven. 72 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-07-21 02:14:40,914 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1498844241] [2020-07-21 02:14:40,914 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 02:14:40,914 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2020-07-21 02:14:40,914 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1026396578] [2020-07-21 02:14:40,915 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 02:14:40,915 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 02:14:40,915 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 02:14:40,916 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2020-07-21 02:14:40,916 INFO L87 Difference]: Start difference. First operand 116 states and 135 transitions. Second operand 18 states. [2020-07-21 02:14:41,381 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 20 [2020-07-21 02:14:41,907 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 20 [2020-07-21 02:14:42,207 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 15 [2020-07-21 02:14:42,599 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 19 [2020-07-21 02:14:43,121 WARN L193 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-21 02:14:45,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 02:14:45,681 INFO L93 Difference]: Finished difference Result 140 states and 156 transitions. [2020-07-21 02:14:45,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 02:14:45,682 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 69 [2020-07-21 02:14:45,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 02:14:45,684 INFO L225 Difference]: With dead ends: 140 [2020-07-21 02:14:45,684 INFO L226 Difference]: Without dead ends: 86 [2020-07-21 02:14:45,687 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 119 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=98, Invalid=502, Unknown=0, NotChecked=0, Total=600 [2020-07-21 02:14:45,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-07-21 02:14:45,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2020-07-21 02:14:45,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-07-21 02:14:45,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 100 transitions. [2020-07-21 02:14:45,709 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 100 transitions. Word has length 69 [2020-07-21 02:14:45,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 02:14:45,709 INFO L479 AbstractCegarLoop]: Abstraction has 86 states and 100 transitions. [2020-07-21 02:14:45,709 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 02:14:45,709 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 100 transitions. [2020-07-21 02:14:45,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-07-21 02:14:45,711 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 02:14:45,711 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 7, 7, 7, 7, 5, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 02:14:45,911 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 02:14:45,912 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 02:14:45,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 02:14:45,913 INFO L82 PathProgramCache]: Analyzing trace with hash 728435349, now seen corresponding path program 6 times [2020-07-21 02:14:45,913 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 02:14:45,914 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [129196709] [2020-07-21 02:14:45,914 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 02:14:45,962 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 02:14:45,963 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 02:14:45,964 INFO L263 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 02:14:45,968 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 02:14:46,058 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 52 proven. 60 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2020-07-21 02:14:46,059 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 02:14:46,167 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 52 proven. 60 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2020-07-21 02:14:46,168 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [129196709] [2020-07-21 02:14:46,168 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 02:14:46,168 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 13 [2020-07-21 02:14:46,168 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1866302592] [2020-07-21 02:14:46,169 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 02:14:46,169 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 02:14:46,169 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 02:14:46,170 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=108, Unknown=0, NotChecked=0, Total=156 [2020-07-21 02:14:46,170 INFO L87 Difference]: Start difference. First operand 86 states and 100 transitions. Second operand 13 states. [2020-07-21 02:14:46,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 02:14:46,704 INFO L93 Difference]: Finished difference Result 148 states and 180 transitions. [2020-07-21 02:14:46,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 02:14:46,707 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 77 [2020-07-21 02:14:46,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 02:14:46,714 INFO L225 Difference]: With dead ends: 148 [2020-07-21 02:14:46,714 INFO L226 Difference]: Without dead ends: 118 [2020-07-21 02:14:46,715 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 139 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=72, Invalid=168, Unknown=0, NotChecked=0, Total=240 [2020-07-21 02:14:46,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-21 02:14:46,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 116. [2020-07-21 02:14:46,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2020-07-21 02:14:46,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 139 transitions. [2020-07-21 02:14:46,733 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 139 transitions. Word has length 77 [2020-07-21 02:14:46,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 02:14:46,735 INFO L479 AbstractCegarLoop]: Abstraction has 116 states and 139 transitions. [2020-07-21 02:14:46,735 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 02:14:46,736 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 139 transitions. [2020-07-21 02:14:46,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-07-21 02:14:46,738 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 02:14:46,738 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 7, 7, 7, 7, 5, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 02:14:46,951 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 02:14:46,952 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 02:14:46,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 02:14:46,953 INFO L82 PathProgramCache]: Analyzing trace with hash -323556203, now seen corresponding path program 7 times [2020-07-21 02:14:46,953 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 02:14:46,953 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [66461095] [2020-07-21 02:14:46,954 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 02:14:46,995 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 02:14:46,995 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 02:14:46,996 INFO L263 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 02:14:46,997 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 02:14:47,084 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 52 proven. 60 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2020-07-21 02:14:47,084 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 02:14:47,187 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 52 proven. 60 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2020-07-21 02:14:47,187 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [66461095] [2020-07-21 02:14:47,187 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 02:14:47,188 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-21 02:14:47,188 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [588305129] [2020-07-21 02:14:47,188 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 02:14:47,189 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 02:14:47,189 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 02:14:47,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2020-07-21 02:14:47,189 INFO L87 Difference]: Start difference. First operand 116 states and 139 transitions. Second operand 12 states. [2020-07-21 02:14:47,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 02:14:47,685 INFO L93 Difference]: Finished difference Result 138 states and 162 transitions. [2020-07-21 02:14:47,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 02:14:47,692 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 77 [2020-07-21 02:14:47,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 02:14:47,693 INFO L225 Difference]: With dead ends: 138 [2020-07-21 02:14:47,694 INFO L226 Difference]: Without dead ends: 116 [2020-07-21 02:14:47,696 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 139 SyntacticMatches, 4 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=77, Invalid=195, Unknown=0, NotChecked=0, Total=272 [2020-07-21 02:14:47,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2020-07-21 02:14:47,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 116. [2020-07-21 02:14:47,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2020-07-21 02:14:47,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 137 transitions. [2020-07-21 02:14:47,712 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 137 transitions. Word has length 77 [2020-07-21 02:14:47,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 02:14:47,713 INFO L479 AbstractCegarLoop]: Abstraction has 116 states and 137 transitions. [2020-07-21 02:14:47,713 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 02:14:47,713 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 137 transitions. [2020-07-21 02:14:47,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-07-21 02:14:47,714 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 02:14:47,714 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 9, 8, 8, 8, 8, 6, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 02:14:47,928 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 02:14:47,929 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 02:14:47,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 02:14:47,930 INFO L82 PathProgramCache]: Analyzing trace with hash -1534824776, now seen corresponding path program 8 times [2020-07-21 02:14:47,930 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 02:14:47,931 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1560084934] [2020-07-21 02:14:47,931 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 02:14:47,976 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 02:14:47,977 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 02:14:47,978 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 41 conjunts are in the unsatisfiable core [2020-07-21 02:14:47,980 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 02:14:49,132 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 16 proven. 128 refuted. 0 times theorem prover too weak. 116 trivial. 0 not checked. [2020-07-21 02:14:49,133 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 02:14:49,339 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 02:14:52,187 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 16 proven. 128 refuted. 0 times theorem prover too weak. 116 trivial. 0 not checked. [2020-07-21 02:14:52,188 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1560084934] [2020-07-21 02:14:52,188 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 02:14:52,189 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 22 [2020-07-21 02:14:52,189 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [561683414] [2020-07-21 02:14:52,190 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 02:14:52,190 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 02:14:52,191 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 02:14:52,192 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=399, Unknown=0, NotChecked=0, Total=462 [2020-07-21 02:14:52,192 INFO L87 Difference]: Start difference. First operand 116 states and 137 transitions. Second operand 22 states. [2020-07-21 02:14:53,918 WARN L193 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 13 [2020-07-21 02:14:55,078 WARN L193 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 13 [2020-07-21 02:14:55,973 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 13 [2020-07-21 02:14:56,915 WARN L193 SmtUtils]: Spent 264.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 15 [2020-07-21 02:14:58,860 WARN L193 SmtUtils]: Spent 180.00 ms on a formula simplification that was a NOOP. DAG size: 20 [2020-07-21 02:14:59,954 WARN L193 SmtUtils]: Spent 340.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 16 [2020-07-21 02:15:00,944 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 20 [2020-07-21 02:15:05,334 WARN L193 SmtUtils]: Spent 388.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 16 [2020-07-21 02:15:06,424 WARN L193 SmtUtils]: Spent 266.00 ms on a formula simplification that was a NOOP. DAG size: 19 [2020-07-21 02:15:08,131 WARN L193 SmtUtils]: Spent 345.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 16 [2020-07-21 02:15:10,590 WARN L193 SmtUtils]: Spent 655.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 02:15:12,303 WARN L193 SmtUtils]: Spent 460.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 19 [2020-07-21 02:15:14,054 WARN L193 SmtUtils]: Spent 527.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 18 [2020-07-21 02:15:16,166 WARN L193 SmtUtils]: Spent 404.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 02:15:17,892 WARN L193 SmtUtils]: Spent 452.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 19 [2020-07-21 02:15:19,394 WARN L193 SmtUtils]: Spent 270.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2020-07-21 02:15:21,186 WARN L193 SmtUtils]: Spent 452.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 19 [2020-07-21 02:15:22,423 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 21 [2020-07-21 02:15:23,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 02:15:23,073 INFO L93 Difference]: Finished difference Result 240 states and 285 transitions. [2020-07-21 02:15:23,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-07-21 02:15:23,076 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 85 [2020-07-21 02:15:23,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 02:15:23,081 INFO L225 Difference]: With dead ends: 240 [2020-07-21 02:15:23,081 INFO L226 Difference]: Without dead ends: 162 [2020-07-21 02:15:23,087 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 146 SyntacticMatches, 3 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 193 ImplicationChecksByTransitivity, 23.7s TimeCoverageRelationStatistics Valid=248, Invalid=1392, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 02:15:23,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2020-07-21 02:15:23,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 138. [2020-07-21 02:15:23,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 138 states. [2020-07-21 02:15:23,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 162 transitions. [2020-07-21 02:15:23,116 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 162 transitions. Word has length 85 [2020-07-21 02:15:23,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 02:15:23,116 INFO L479 AbstractCegarLoop]: Abstraction has 138 states and 162 transitions. [2020-07-21 02:15:23,116 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 02:15:23,117 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 162 transitions. [2020-07-21 02:15:23,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2020-07-21 02:15:23,118 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 02:15:23,119 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 9, 9, 9, 9, 6, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 02:15:23,332 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 02:15:23,333 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 02:15:23,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 02:15:23,334 INFO L82 PathProgramCache]: Analyzing trace with hash -2106989411, now seen corresponding path program 9 times [2020-07-21 02:15:23,334 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 02:15:23,334 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1470292444] [2020-07-21 02:15:23,335 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 02:15:23,402 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 02:15:23,402 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 02:15:23,404 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 41 conjunts are in the unsatisfiable core [2020-07-21 02:15:23,408 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 02:15:24,484 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 02:15:24,854 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 02:15:25,263 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 02:15:26,118 INFO L134 CoverageAnalysis]: Checked inductivity of 328 backedges. 18 proven. 162 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2020-07-21 02:15:26,119 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 02:15:26,608 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 02:15:33,385 INFO L134 CoverageAnalysis]: Checked inductivity of 328 backedges. 18 proven. 162 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2020-07-21 02:15:33,385 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1470292444] [2020-07-21 02:15:33,386 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 02:15:33,386 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 24 [2020-07-21 02:15:33,386 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1989803547] [2020-07-21 02:15:33,386 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 02:15:33,387 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 02:15:33,387 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 02:15:33,387 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=485, Unknown=0, NotChecked=0, Total=552 [2020-07-21 02:15:33,388 INFO L87 Difference]: Start difference. First operand 138 states and 162 transitions. Second operand 24 states. [2020-07-21 02:15:36,073 WARN L193 SmtUtils]: Spent 1.33 s on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 02:15:36,878 WARN L193 SmtUtils]: Spent 317.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 22 [2020-07-21 02:15:37,728 WARN L193 SmtUtils]: Spent 317.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-21 02:15:39,080 WARN L193 SmtUtils]: Spent 354.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 02:15:43,462 WARN L193 SmtUtils]: Spent 742.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 02:15:44,792 WARN L193 SmtUtils]: Spent 374.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-21 02:15:48,334 WARN L193 SmtUtils]: Spent 2.59 s on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-21 02:15:49,944 WARN L193 SmtUtils]: Spent 628.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 19 [2020-07-21 02:15:51,370 WARN L193 SmtUtils]: Spent 580.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 19 [2020-07-21 02:15:51,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 02:15:51,560 INFO L93 Difference]: Finished difference Result 154 states and 177 transitions. [2020-07-21 02:15:51,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-21 02:15:51,568 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 93 [2020-07-21 02:15:51,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 02:15:51,573 INFO L225 Difference]: With dead ends: 154 [2020-07-21 02:15:51,574 INFO L226 Difference]: Without dead ends: 96 [2020-07-21 02:15:51,575 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 161 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 21.9s TimeCoverageRelationStatistics Valid=138, Invalid=984, Unknown=0, NotChecked=0, Total=1122 [2020-07-21 02:15:51,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-07-21 02:15:51,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 96. [2020-07-21 02:15:51,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2020-07-21 02:15:51,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 112 transitions. [2020-07-21 02:15:51,589 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 112 transitions. Word has length 93 [2020-07-21 02:15:51,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 02:15:51,589 INFO L479 AbstractCegarLoop]: Abstraction has 96 states and 112 transitions. [2020-07-21 02:15:51,589 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 02:15:51,590 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 112 transitions. [2020-07-21 02:15:51,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2020-07-21 02:15:51,592 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 02:15:51,593 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 9, 9, 9, 9, 7, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 02:15:51,807 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 02:15:51,808 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 02:15:51,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 02:15:51,809 INFO L82 PathProgramCache]: Analyzing trace with hash -178978853, now seen corresponding path program 10 times [2020-07-21 02:15:51,809 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 02:15:51,810 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1949314621] [2020-07-21 02:15:51,810 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 02:15:51,899 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 02:15:51,899 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 02:15:51,901 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 02:15:51,904 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 02:15:52,040 INFO L134 CoverageAnalysis]: Checked inductivity of 328 backedges. 76 proven. 104 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2020-07-21 02:15:52,041 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 02:15:52,221 INFO L134 CoverageAnalysis]: Checked inductivity of 328 backedges. 76 proven. 104 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2020-07-21 02:15:52,222 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1949314621] [2020-07-21 02:15:52,222 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 02:15:52,222 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2020-07-21 02:15:52,222 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [685399945] [2020-07-21 02:15:52,223 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 02:15:52,223 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 02:15:52,223 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 02:15:52,223 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=151, Unknown=0, NotChecked=0, Total=210 [2020-07-21 02:15:52,224 INFO L87 Difference]: Start difference. First operand 96 states and 112 transitions. Second operand 15 states. [2020-07-21 02:15:52,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 02:15:52,690 INFO L93 Difference]: Finished difference Result 126 states and 147 transitions. [2020-07-21 02:15:52,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 02:15:52,694 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 93 [2020-07-21 02:15:52,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 02:15:52,696 INFO L225 Difference]: With dead ends: 126 [2020-07-21 02:15:52,697 INFO L226 Difference]: Without dead ends: 94 [2020-07-21 02:15:52,700 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 167 SyntacticMatches, 5 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=97, Invalid=245, Unknown=0, NotChecked=0, Total=342 [2020-07-21 02:15:52,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-07-21 02:15:52,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 72. [2020-07-21 02:15:52,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-07-21 02:15:52,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 82 transitions. [2020-07-21 02:15:52,712 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 82 transitions. Word has length 93 [2020-07-21 02:15:52,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 02:15:52,712 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 82 transitions. [2020-07-21 02:15:52,712 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 02:15:52,713 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 82 transitions. [2020-07-21 02:15:52,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2020-07-21 02:15:52,714 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 02:15:52,714 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 11, 10, 10, 10, 10, 8, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 02:15:52,929 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 02:15:52,930 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 02:15:52,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 02:15:52,930 INFO L82 PathProgramCache]: Analyzing trace with hash -837428226, now seen corresponding path program 11 times [2020-07-21 02:15:52,931 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 02:15:52,931 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2089298754] [2020-07-21 02:15:52,931 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 02:15:52,982 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 02:15:52,982 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 02:15:52,984 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 45 conjunts are in the unsatisfiable core [2020-07-21 02:15:52,987 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 02:15:55,552 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-21 02:15:55,881 INFO L134 CoverageAnalysis]: Checked inductivity of 404 backedges. 20 proven. 200 refuted. 0 times theorem prover too weak. 184 trivial. 0 not checked. [2020-07-21 02:15:55,881 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 02:15:56,127 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 02:16:04,527 INFO L134 CoverageAnalysis]: Checked inductivity of 404 backedges. 20 proven. 200 refuted. 0 times theorem prover too weak. 184 trivial. 0 not checked. [2020-07-21 02:16:04,527 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2089298754] [2020-07-21 02:16:04,527 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 02:16:04,528 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 26 [2020-07-21 02:16:04,528 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1702164334] [2020-07-21 02:16:04,528 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-21 02:16:04,528 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 02:16:04,529 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-21 02:16:04,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=583, Unknown=0, NotChecked=0, Total=650 [2020-07-21 02:16:04,529 INFO L87 Difference]: Start difference. First operand 72 states and 82 transitions. Second operand 26 states. [2020-07-21 02:16:06,486 WARN L193 SmtUtils]: Spent 326.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 19 [2020-07-21 02:16:07,338 WARN L193 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 16 [2020-07-21 02:16:08,049 WARN L193 SmtUtils]: Spent 256.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 16 [2020-07-21 02:16:12,483 WARN L193 SmtUtils]: Spent 298.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 16 [2020-07-21 02:16:13,510 WARN L193 SmtUtils]: Spent 332.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-21 02:16:40,893 WARN L193 SmtUtils]: Spent 3.48 s on a formula simplification that was a NOOP. DAG size: 21 [2020-07-21 02:16:55,445 WARN L838 $PredicateComparison]: unable to prove that (let ((.cse0 (* c_main_~y1~0 c_main_~x2~0))) (and (= (+ c_main_~x1~0 3) (+ c_main_~x2~0 c_main_~y3~0 .cse0)) (= (+ (* 2 c_main_~y2~0) (* 3 c_main_~y1~0) c_main_~y3~0 (* c_main_~y2~0 c_main_~y1~0)) (+ c_main_~x1~0 2)) (= (+ c_main_~y2~0 c_main_~y3~0 .cse0) c_main_~x1~0))) is different from false [2020-07-21 02:16:58,294 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-21 02:17:03,149 WARN L193 SmtUtils]: Spent 566.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-21 02:17:10,229 WARN L193 SmtUtils]: Spent 275.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-21 02:17:33,471 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-21 02:17:52,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 02:17:52,518 INFO L93 Difference]: Finished difference Result 198 states and 236 transitions. [2020-07-21 02:17:52,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-21 02:17:52,527 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 101 [2020-07-21 02:17:52,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 02:17:52,528 INFO L225 Difference]: With dead ends: 198 [2020-07-21 02:17:52,528 INFO L226 Difference]: Without dead ends: 168 [2020-07-21 02:17:52,530 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 175 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 164 ImplicationChecksByTransitivity, 69.1s TimeCoverageRelationStatistics Valid=151, Invalid=1487, Unknown=6, NotChecked=78, Total=1722 [2020-07-21 02:17:52,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2020-07-21 02:17:52,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 168. [2020-07-21 02:17:52,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 168 states. [2020-07-21 02:17:52,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 199 transitions. [2020-07-21 02:17:52,555 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 199 transitions. Word has length 101 [2020-07-21 02:17:52,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 02:17:52,558 INFO L479 AbstractCegarLoop]: Abstraction has 168 states and 199 transitions. [2020-07-21 02:17:52,558 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-21 02:17:52,558 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 199 transitions. [2020-07-21 02:17:52,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-21 02:17:52,561 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 02:17:52,561 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 12, 11, 11, 11, 11, 9, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 02:17:52,774 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 02:17:52,775 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 02:17:52,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 02:17:52,776 INFO L82 PathProgramCache]: Analyzing trace with hash -1126316255, now seen corresponding path program 12 times [2020-07-21 02:17:52,776 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 02:17:52,777 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1347566538] [2020-07-21 02:17:52,777 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 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 02:17:52,826 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 02:17:52,826 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 02:17:52,828 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 02:17:52,830 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 02:17:52,953 INFO L134 CoverageAnalysis]: Checked inductivity of 488 backedges. 104 proven. 160 refuted. 0 times theorem prover too weak. 224 trivial. 0 not checked. [2020-07-21 02:17:52,953 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 02:17:53,143 INFO L134 CoverageAnalysis]: Checked inductivity of 488 backedges. 104 proven. 160 refuted. 0 times theorem prover too weak. 224 trivial. 0 not checked. [2020-07-21 02:17:53,143 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1347566538] [2020-07-21 02:17:53,143 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 02:17:53,143 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 18 [2020-07-21 02:17:53,144 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [966274611] [2020-07-21 02:17:53,144 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 02:17:53,144 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 02:17:53,144 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 02:17:53,145 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=223, Unknown=0, NotChecked=0, Total=306 [2020-07-21 02:17:53,145 INFO L87 Difference]: Start difference. First operand 168 states and 199 transitions. Second operand 18 states. [2020-07-21 02:17:54,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 02:17:54,393 INFO L93 Difference]: Finished difference Result 226 states and 271 transitions. [2020-07-21 02:17:54,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-21 02:17:54,398 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 109 [2020-07-21 02:17:54,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 02:17:54,400 INFO L225 Difference]: With dead ends: 226 [2020-07-21 02:17:54,400 INFO L226 Difference]: Without dead ends: 196 [2020-07-21 02:17:54,401 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 195 SyntacticMatches, 6 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 141 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=174, Invalid=528, Unknown=0, NotChecked=0, Total=702 [2020-07-21 02:17:54,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2020-07-21 02:17:54,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 196. [2020-07-21 02:17:54,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 196 states. [2020-07-21 02:17:54,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 236 transitions. [2020-07-21 02:17:54,423 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 236 transitions. Word has length 109 [2020-07-21 02:17:54,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 02:17:54,423 INFO L479 AbstractCegarLoop]: Abstraction has 196 states and 236 transitions. [2020-07-21 02:17:54,423 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 02:17:54,423 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 236 transitions. [2020-07-21 02:17:54,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-21 02:17:54,425 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 02:17:54,425 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 13, 12, 12, 12, 12, 10, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 02:17:54,637 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 02:17:54,638 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 02:17:54,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 02:17:54,639 INFO L82 PathProgramCache]: Analyzing trace with hash 1251867972, now seen corresponding path program 13 times [2020-07-21 02:17:54,639 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 02:17:54,639 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1536881762] [2020-07-21 02:17:54,640 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 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 02:17:54,692 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 02:17:54,692 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 02:17:54,694 INFO L263 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 51 conjunts are in the unsatisfiable core [2020-07-21 02:17:54,696 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 02:17:54,976 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-21 02:17:55,188 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-21 02:17:55,428 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-21 02:17:55,693 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-21 02:17:55,978 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-21 02:17:56,414 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 02:17:56,863 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 02:17:57,350 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 02:17:57,880 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 02:17:58,480 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 02:17:59,363 WARN L193 SmtUtils]: Spent 224.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-21 02:18:00,227 INFO L134 CoverageAnalysis]: Checked inductivity of 580 backedges. 24 proven. 288 refuted. 0 times theorem prover too weak. 268 trivial. 0 not checked. [2020-07-21 02:18:00,227 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 02:18:01,101 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 02:18:25,496 INFO L134 CoverageAnalysis]: Checked inductivity of 580 backedges. 24 proven. 288 refuted. 0 times theorem prover too weak. 268 trivial. 0 not checked. [2020-07-21 02:18:25,496 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1536881762] [2020-07-21 02:18:25,496 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 02:18:25,496 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 30 [2020-07-21 02:18:25,497 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1924561592] [2020-07-21 02:18:25,497 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-07-21 02:18:25,497 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 02:18:25,498 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-07-21 02:18:25,498 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=792, Unknown=0, NotChecked=0, Total=870 [2020-07-21 02:18:25,498 INFO L87 Difference]: Start difference. First operand 196 states and 236 transitions. Second operand 30 states. [2020-07-21 02:19:04,761 WARN L193 SmtUtils]: Spent 587.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 19 [2020-07-21 02:19:07,059 WARN L193 SmtUtils]: Spent 466.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 16 [2020-07-21 02:19:09,313 WARN L193 SmtUtils]: Spent 824.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 21 [2020-07-21 02:19:25,330 WARN L193 SmtUtils]: Spent 527.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 21 [2020-07-21 02:19:41,062 WARN L193 SmtUtils]: Spent 645.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 21 [2020-07-21 02:19:57,888 WARN L193 SmtUtils]: Spent 644.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-21 02:20:39,901 WARN L193 SmtUtils]: Spent 1.44 s on a formula simplification that was a NOOP. DAG size: 21 [2020-07-21 02:20:54,956 WARN L193 SmtUtils]: Spent 631.00 ms on a formula simplification that was a NOOP. DAG size: 19 [2020-07-21 02:21:02,815 WARN L193 SmtUtils]: Spent 1.55 s on a formula simplification that was a NOOP. DAG size: 18 [2020-07-21 02:21:19,579 WARN L193 SmtUtils]: Spent 1.21 s on a formula simplification that was a NOOP. DAG size: 17 [2020-07-21 02:21:37,197 WARN L193 SmtUtils]: Spent 411.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-21 02:21:59,020 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-21 02:22:10,112 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-21 02:22:18,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 02:22:18,694 INFO L93 Difference]: Finished difference Result 350 states and 421 transitions. [2020-07-21 02:22:18,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-07-21 02:22:18,703 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 117 [2020-07-21 02:22:18,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 02:22:18,707 INFO L225 Difference]: With dead ends: 350 [2020-07-21 02:22:18,707 INFO L226 Difference]: Without dead ends: 316 [2020-07-21 02:22:18,709 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 203 SyntacticMatches, 2 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 243 ImplicationChecksByTransitivity, 166.6s TimeCoverageRelationStatistics Valid=182, Invalid=2154, Unknown=16, NotChecked=0, Total=2352 [2020-07-21 02:22:18,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 316 states. [2020-07-21 02:22:18,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 316 to 316. [2020-07-21 02:22:18,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 316 states. [2020-07-21 02:22:18,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 379 transitions. [2020-07-21 02:22:18,752 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 379 transitions. Word has length 117 [2020-07-21 02:22:18,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 02:22:18,753 INFO L479 AbstractCegarLoop]: Abstraction has 316 states and 379 transitions. [2020-07-21 02:22:18,753 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-07-21 02:22:18,753 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 379 transitions. [2020-07-21 02:22:18,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2020-07-21 02:22:18,755 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 02:22:18,755 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 13, 13, 13, 13, 11, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 02:22:18,968 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 02:22:18,969 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 02:22:18,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 02:22:18,970 INFO L82 PathProgramCache]: Analyzing trace with hash -1050066329, now seen corresponding path program 14 times [2020-07-21 02:22:18,970 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 02:22:18,970 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [875826167] [2020-07-21 02:22:18,971 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 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 02:22:19,019 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 02:22:19,020 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 02:22:19,021 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 02:22:19,022 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 02:22:19,200 INFO L134 CoverageAnalysis]: Checked inductivity of 680 backedges. 136 proven. 228 refuted. 0 times theorem prover too weak. 316 trivial. 0 not checked. [2020-07-21 02:22:19,200 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 02:22:19,478 INFO L134 CoverageAnalysis]: Checked inductivity of 680 backedges. 136 proven. 228 refuted. 0 times theorem prover too weak. 316 trivial. 0 not checked. [2020-07-21 02:22:19,478 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [875826167] [2020-07-21 02:22:19,478 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 02:22:19,479 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 21 [2020-07-21 02:22:19,479 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [999090097] [2020-07-21 02:22:19,479 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 02:22:19,480 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 02:22:19,480 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 02:22:19,480 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=309, Unknown=0, NotChecked=0, Total=420 [2020-07-21 02:22:19,480 INFO L87 Difference]: Start difference. First operand 316 states and 379 transitions. Second operand 21 states. [2020-07-21 02:22:23,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 02:22:23,415 INFO L93 Difference]: Finished difference Result 386 states and 467 transitions. [2020-07-21 02:22:23,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-21 02:22:23,422 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 125 [2020-07-21 02:22:23,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 02:22:23,425 INFO L225 Difference]: With dead ends: 386 [2020-07-21 02:22:23,425 INFO L226 Difference]: Without dead ends: 352 [2020-07-21 02:22:23,428 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 264 GetRequests, 223 SyntacticMatches, 7 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 267 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=284, Invalid=976, Unknown=0, NotChecked=0, Total=1260 [2020-07-21 02:22:23,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 352 states. [2020-07-21 02:22:23,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 352 to 352. [2020-07-21 02:22:23,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 352 states. [2020-07-21 02:22:23,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 352 states to 352 states and 427 transitions. [2020-07-21 02:22:23,465 INFO L78 Accepts]: Start accepts. Automaton has 352 states and 427 transitions. Word has length 125 [2020-07-21 02:22:23,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 02:22:23,469 INFO L479 AbstractCegarLoop]: Abstraction has 352 states and 427 transitions. [2020-07-21 02:22:23,470 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 02:22:23,470 INFO L276 IsEmpty]: Start isEmpty. Operand 352 states and 427 transitions. [2020-07-21 02:22:23,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2020-07-21 02:22:23,470 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 02:22:23,471 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 15, 14, 14, 14, 14, 12, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 02:22:23,671 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 02:22:23,672 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 02:22:23,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 02:22:23,672 INFO L82 PathProgramCache]: Analyzing trace with hash 3461770, now seen corresponding path program 15 times [2020-07-21 02:22:23,673 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 02:22:23,673 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1500018025] [2020-07-21 02:22:23,673 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 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 02:22:23,726 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 02:22:23,727 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 02:22:23,728 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 57 conjunts are in the unsatisfiable core [2020-07-21 02:22:23,731 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 02:22:23,857 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-21 02:22:24,139 WARN L193 SmtUtils]: Spent 201.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-21 02:22:24,466 WARN L193 SmtUtils]: Spent 205.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-21 02:22:24,820 WARN L193 SmtUtils]: Spent 199.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-21 02:22:25,226 WARN L193 SmtUtils]: Spent 215.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-21 02:22:25,672 WARN L193 SmtUtils]: Spent 200.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-21 02:22:26,179 WARN L193 SmtUtils]: Spent 232.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-21 02:22:26,954 WARN L193 SmtUtils]: Spent 255.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 02:22:27,776 WARN L193 SmtUtils]: Spent 229.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 02:22:28,691 WARN L193 SmtUtils]: Spent 236.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 02:22:29,657 WARN L193 SmtUtils]: Spent 238.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 02:22:30,715 WARN L193 SmtUtils]: Spent 223.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 02:22:31,833 WARN L193 SmtUtils]: Spent 220.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 02:22:33,488 WARN L193 SmtUtils]: Spent 382.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-21 02:22:35,182 INFO L134 CoverageAnalysis]: Checked inductivity of 788 backedges. 28 proven. 392 refuted. 0 times theorem prover too weak. 368 trivial. 0 not checked. [2020-07-21 02:22:35,183 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 02:22:36,835 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 02:22:50,659 WARN L193 SmtUtils]: Spent 1.15 s on a formula simplification that was a NOOP. DAG size: 9 [2020-07-21 02:23:24,561 INFO L134 CoverageAnalysis]: Checked inductivity of 788 backedges. 28 proven. 392 refuted. 0 times theorem prover too weak. 368 trivial. 0 not checked. [2020-07-21 02:23:24,562 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1500018025] [2020-07-21 02:23:24,562 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 02:23:24,562 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 34 [2020-07-21 02:23:24,562 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1503193330] [2020-07-21 02:23:24,562 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-07-21 02:23:24,563 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 02:23:24,563 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-07-21 02:23:24,563 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=1033, Unknown=0, NotChecked=0, Total=1122 [2020-07-21 02:23:24,563 INFO L87 Difference]: Start difference. First operand 352 states and 427 transitions. Second operand 34 states. [2020-07-21 02:23:32,058 WARN L838 $PredicateComparison]: unable to prove that (let ((.cse0 (* c_main_~y1~0 c_main_~x2~0))) (and (= (+ (* 2 c_main_~y2~0) (* 6 c_main_~y1~0) c_main_~y3~0 (* c_main_~y2~0 c_main_~y1~0)) (+ c_main_~x1~0 1)) (= (+ c_main_~x1~0 5) (+ c_main_~x2~0 c_main_~y3~0 .cse0)) (= (+ c_main_~y2~0 c_main_~y3~0 .cse0) c_main_~x1~0))) is different from false [2020-07-21 02:23:48,561 WARN L193 SmtUtils]: Spent 1.07 s on a formula simplification that was a NOOP. DAG size: 20 [2020-07-21 02:24:08,381 WARN L193 SmtUtils]: Spent 1.23 s on a formula simplification that was a NOOP. DAG size: 19 [2020-07-21 02:24:38,970 WARN L193 SmtUtils]: Spent 489.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-21 02:24:48,986 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-21 02:25:17,701 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-21 02:25:56,157 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-21 02:26:51,651 WARN L193 SmtUtils]: Spent 751.00 ms on a formula simplification that was a NOOP. DAG size: 19 [2020-07-21 02:26:58,133 WARN L193 SmtUtils]: Spent 4.66 s on a formula simplification. DAG size of input: 21 DAG size of output: 20 [2020-07-21 02:27:02,183 WARN L193 SmtUtils]: Spent 1.14 s on a formula simplification. DAG size of input: 24 DAG size of output: 22 [2020-07-21 02:27:05,828 WARN L193 SmtUtils]: Spent 1.18 s on a formula simplification. DAG size of input: 24 DAG size of output: 22 [2020-07-21 02:27:31,433 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-21 02:27:59,030 WARN L193 SmtUtils]: Spent 1.67 s on a formula simplification that was a NOOP. DAG size: 19 [2020-07-21 02:28:10,259 WARN L193 SmtUtils]: Spent 1.07 s on a formula simplification. DAG size of input: 25 DAG size of output: 16