/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 DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/bitvector/gcd_4.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 19:15:24,230 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 19:15:24,233 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 19:15:24,253 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 19:15:24,254 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 19:15:24,256 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 19:15:24,258 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 19:15:24,268 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 19:15:24,273 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 19:15:24,276 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 19:15:24,278 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 19:15:24,279 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 19:15:24,279 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 19:15:24,281 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 19:15:24,283 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 19:15:24,284 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 19:15:24,286 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 19:15:24,287 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 19:15:24,289 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 19:15:24,294 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 19:15:24,299 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 19:15:24,303 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 19:15:24,304 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 19:15:24,305 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 19:15:24,307 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 19:15:24,317 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 19:15:24,318 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 19:15:24,319 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 19:15:24,320 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 19:15:24,353 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 19:15:24,353 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 19:15:24,357 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 19:15:24,357 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 19:15:24,357 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 19:15:24,357 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 19:15:24,358 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 19:15:24,358 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 19:15:24,358 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 19:15:24,361 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 19:15:24,361 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 19:15:24,361 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 19:15:24,361 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 19:15:24,362 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 19:15:24,362 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 19:15:24,362 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 19:15:24,362 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 19:15:24,362 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 19:15:24,363 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 19:15:24,363 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 19:15:24,363 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 19:15:24,364 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 19:15:24,364 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 19:15:24,365 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 19:15:24,365 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 19:15:24,365 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 19:15:24,365 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:15:24,365 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 19:15:24,366 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 19:15:24,366 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 -> DAGSIZE 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 -> 2 [2020-07-21 19:15:24,644 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 19:15:24,657 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 19:15:24,660 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 19:15:24,662 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 19:15:24,662 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 19:15:24,663 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/bitvector/gcd_4.c [2020-07-21 19:15:24,724 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d20934417/ca2289d92d124bc58b29742241b2dfef/FLAG84dde5918 [2020-07-21 19:15:25,174 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 19:15:25,174 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/bitvector/gcd_4.c [2020-07-21 19:15:25,181 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d20934417/ca2289d92d124bc58b29742241b2dfef/FLAG84dde5918 [2020-07-21 19:15:25,539 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d20934417/ca2289d92d124bc58b29742241b2dfef [2020-07-21 19:15:25,547 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 19:15:25,550 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 19:15:25,551 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 19:15:25,552 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 19:15:25,555 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 19:15:25,556 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 07:15:25" (1/1) ... [2020-07-21 19:15:25,559 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@54b46a4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:15:25, skipping insertion in model container [2020-07-21 19:15:25,559 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 07:15:25" (1/1) ... [2020-07-21 19:15:25,567 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 19:15:25,584 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 19:15:25,732 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 19:15:25,737 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 19:15:25,755 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 19:15:25,767 INFO L208 MainTranslator]: Completed translation [2020-07-21 19:15:25,768 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:15:25 WrapperNode [2020-07-21 19:15:25,768 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 19:15:25,769 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 19:15:25,769 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 19:15:25,769 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 19:15:25,782 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:15:25" (1/1) ... [2020-07-21 19:15:25,782 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:15:25" (1/1) ... [2020-07-21 19:15:25,787 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:15:25" (1/1) ... [2020-07-21 19:15:25,787 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:15:25" (1/1) ... [2020-07-21 19:15:25,792 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:15:25" (1/1) ... [2020-07-21 19:15:25,884 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:15:25" (1/1) ... [2020-07-21 19:15:25,885 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:15:25" (1/1) ... [2020-07-21 19:15:25,887 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 19:15:25,887 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 19:15:25,888 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 19:15:25,888 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 19:15:25,889 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:15:25" (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 19:15:25,947 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 19:15:25,948 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 19:15:25,948 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 19:15:25,948 INFO L138 BoogieDeclarations]: Found implementation of procedure gcd_test [2020-07-21 19:15:25,948 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 19:15:25,948 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 19:15:25,948 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 19:15:25,949 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 19:15:25,949 INFO L130 BoogieDeclarations]: Found specification of procedure gcd_test [2020-07-21 19:15:25,949 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 19:15:25,949 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 19:15:25,949 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 19:15:26,146 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 19:15:26,147 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 19:15:26,151 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 07:15:26 BoogieIcfgContainer [2020-07-21 19:15:26,151 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 19:15:26,153 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 19:15:26,153 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 19:15:26,156 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 19:15:26,157 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 07:15:25" (1/3) ... [2020-07-21 19:15:26,158 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4aa6eb43 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 07:15:26, skipping insertion in model container [2020-07-21 19:15:26,158 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:15:25" (2/3) ... [2020-07-21 19:15:26,158 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4aa6eb43 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 07:15:26, skipping insertion in model container [2020-07-21 19:15:26,158 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 07:15:26" (3/3) ... [2020-07-21 19:15:26,160 INFO L109 eAbstractionObserver]: Analyzing ICFG gcd_4.c [2020-07-21 19:15:26,173 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 19:15:26,183 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 19:15:26,205 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 19:15:26,243 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 19:15:26,243 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 19:15:26,244 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 19:15:26,244 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 19:15:26,244 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 19:15:26,244 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 19:15:26,244 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 19:15:26,244 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 19:15:26,265 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states. [2020-07-21 19:15:26,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-21 19:15:26,273 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:15:26,274 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:15:26,275 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:15:26,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:15:26,282 INFO L82 PathProgramCache]: Analyzing trace with hash 876608673, now seen corresponding path program 1 times [2020-07-21 19:15:26,291 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:15:26,291 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1275338815] [2020-07-21 19:15:26,292 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 19:15:26,362 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:15:26,363 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:15:26,366 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 19:15:26,371 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:15:26,460 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:15:26,461 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:15:26,462 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1275338815] [2020-07-21 19:15:26,462 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:15:26,462 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 19:15:26,464 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [541991105] [2020-07-21 19:15:26,468 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 19:15:26,469 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:15:26,478 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 19:15:26,479 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 19:15:26,481 INFO L87 Difference]: Start difference. First operand 30 states. Second operand 5 states. [2020-07-21 19:15:26,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:15:26,612 INFO L93 Difference]: Finished difference Result 60 states and 81 transitions. [2020-07-21 19:15:26,613 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 19:15:26,615 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-07-21 19:15:26,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:15:26,625 INFO L225 Difference]: With dead ends: 60 [2020-07-21 19:15:26,625 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 19:15:26,629 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 19:15:26,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 19:15:26,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2020-07-21 19:15:26,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-07-21 19:15:26,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 30 transitions. [2020-07-21 19:15:26,674 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 30 transitions. Word has length 17 [2020-07-21 19:15:26,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:15:26,675 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 30 transitions. [2020-07-21 19:15:26,675 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 19:15:26,676 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 30 transitions. [2020-07-21 19:15:26,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-21 19:15:26,678 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:15:26,678 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:15:26,893 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:15:26,893 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:15:26,894 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:15:26,895 INFO L82 PathProgramCache]: Analyzing trace with hash 483581663, now seen corresponding path program 1 times [2020-07-21 19:15:26,895 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:15:26,896 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [625299148] [2020-07-21 19:15:26,896 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 19:15:26,932 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:15:26,933 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:15:26,934 INFO L263 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 19:15:26,936 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:15:26,974 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:15:26,974 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:15:26,975 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [625299148] [2020-07-21 19:15:26,975 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:15:26,975 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 19:15:26,976 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1090066098] [2020-07-21 19:15:26,977 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 19:15:26,978 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:15:26,978 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 19:15:26,979 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 19:15:26,979 INFO L87 Difference]: Start difference. First operand 25 states and 30 transitions. Second operand 5 states. [2020-07-21 19:15:27,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:15:27,047 INFO L93 Difference]: Finished difference Result 42 states and 50 transitions. [2020-07-21 19:15:27,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 19:15:27,049 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-07-21 19:15:27,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:15:27,050 INFO L225 Difference]: With dead ends: 42 [2020-07-21 19:15:27,051 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 19:15:27,054 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 19:15:27,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 19:15:27,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2020-07-21 19:15:27,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-07-21 19:15:27,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2020-07-21 19:15:27,072 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 17 [2020-07-21 19:15:27,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:15:27,073 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2020-07-21 19:15:27,073 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 19:15:27,074 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2020-07-21 19:15:27,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 19:15:27,077 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:15:27,078 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:15:27,292 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:15:27,293 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:15:27,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:15:27,295 INFO L82 PathProgramCache]: Analyzing trace with hash -1158269966, now seen corresponding path program 1 times [2020-07-21 19:15:27,295 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:15:27,296 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2024573175] [2020-07-21 19:15:27,297 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 19:15:27,340 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:15:27,340 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:15:27,341 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 19:15:27,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:15:27,382 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:15:27,382 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:15:27,383 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2024573175] [2020-07-21 19:15:27,385 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:15:27,385 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 19:15:27,385 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1500508422] [2020-07-21 19:15:27,386 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 19:15:27,386 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:15:27,387 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 19:15:27,388 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 19:15:27,388 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand 5 states. [2020-07-21 19:15:27,473 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:15:27,474 INFO L93 Difference]: Finished difference Result 46 states and 55 transitions. [2020-07-21 19:15:27,474 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 19:15:27,475 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 19 [2020-07-21 19:15:27,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:15:27,476 INFO L225 Difference]: With dead ends: 46 [2020-07-21 19:15:27,476 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 19:15:27,477 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 19:15:27,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 19:15:27,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2020-07-21 19:15:27,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-07-21 19:15:27,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2020-07-21 19:15:27,484 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 19 [2020-07-21 19:15:27,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:15:27,484 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2020-07-21 19:15:27,484 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 19:15:27,485 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2020-07-21 19:15:27,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 19:15:27,485 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:15:27,486 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:15:27,700 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:15:27,701 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:15:27,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:15:27,702 INFO L82 PathProgramCache]: Analyzing trace with hash -457205388, now seen corresponding path program 1 times [2020-07-21 19:15:27,703 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:15:27,704 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [643599549] [2020-07-21 19:15:27,704 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 19:15:27,731 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:15:27,731 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:15:27,732 INFO L263 TraceCheckSpWp]: Trace formula consists of 31 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 19:15:27,733 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:15:27,773 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:15:27,773 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:15:27,773 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [643599549] [2020-07-21 19:15:27,774 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:15:27,774 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 19:15:27,774 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [353296996] [2020-07-21 19:15:27,775 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 19:15:27,775 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:15:27,775 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 19:15:27,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 19:15:27,776 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand 5 states. [2020-07-21 19:15:27,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:15:27,818 INFO L93 Difference]: Finished difference Result 40 states and 46 transitions. [2020-07-21 19:15:27,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 19:15:27,819 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 19 [2020-07-21 19:15:27,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:15:27,820 INFO L225 Difference]: With dead ends: 40 [2020-07-21 19:15:27,821 INFO L226 Difference]: Without dead ends: 27 [2020-07-21 19:15:27,822 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 19:15:27,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-07-21 19:15:27,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-07-21 19:15:27,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-21 19:15:27,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2020-07-21 19:15:27,829 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 19 [2020-07-21 19:15:27,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:15:27,829 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2020-07-21 19:15:27,829 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 19:15:27,830 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2020-07-21 19:15:27,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 19:15:27,831 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:15:27,831 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:15:28,046 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:15:28,047 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:15:28,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:15:28,047 INFO L82 PathProgramCache]: Analyzing trace with hash -1431348209, now seen corresponding path program 1 times [2020-07-21 19:15:28,048 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:15:28,048 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [174639070] [2020-07-21 19:15:28,048 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 19:15:28,097 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:15:28,098 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:15:28,099 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 19:15:28,101 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:15:28,151 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:15:28,151 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:15:28,278 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:15:28,279 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [174639070] [2020-07-21 19:15:28,279 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:15:28,279 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 9 [2020-07-21 19:15:28,280 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [975889370] [2020-07-21 19:15:28,281 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 19:15:28,281 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:15:28,282 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 19:15:28,282 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2020-07-21 19:15:28,282 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand 9 states. [2020-07-21 19:15:28,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:15:28,392 INFO L93 Difference]: Finished difference Result 46 states and 56 transitions. [2020-07-21 19:15:28,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 19:15:28,393 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 21 [2020-07-21 19:15:28,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:15:28,395 INFO L225 Difference]: With dead ends: 46 [2020-07-21 19:15:28,397 INFO L226 Difference]: Without dead ends: 29 [2020-07-21 19:15:28,397 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 32 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2020-07-21 19:15:28,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-07-21 19:15:28,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-07-21 19:15:28,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-07-21 19:15:28,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-07-21 19:15:28,409 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 21 [2020-07-21 19:15:28,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:15:28,410 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-07-21 19:15:28,410 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 19:15:28,412 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-07-21 19:15:28,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 19:15:28,414 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:15:28,414 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:15:28,615 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:15:28,615 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:15:28,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:15:28,616 INFO L82 PathProgramCache]: Analyzing trace with hash -1537894100, now seen corresponding path program 1 times [2020-07-21 19:15:28,616 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:15:28,617 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [336490698] [2020-07-21 19:15:28,617 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 19:15:28,641 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:15:28,641 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:15:28,642 INFO L263 TraceCheckSpWp]: Trace formula consists of 35 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 19:15:28,644 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:15:28,722 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:15:28,722 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:15:29,341 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:15:29,341 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [336490698] [2020-07-21 19:15:29,341 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:15:29,342 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 9 [2020-07-21 19:15:29,342 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [987310853] [2020-07-21 19:15:29,343 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 19:15:29,343 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:15:29,343 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 19:15:29,344 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2020-07-21 19:15:29,344 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 9 states. [2020-07-21 19:15:29,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:15:29,467 INFO L93 Difference]: Finished difference Result 46 states and 54 transitions. [2020-07-21 19:15:29,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 19:15:29,468 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 23 [2020-07-21 19:15:29,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:15:29,470 INFO L225 Difference]: With dead ends: 46 [2020-07-21 19:15:29,470 INFO L226 Difference]: Without dead ends: 31 [2020-07-21 19:15:29,471 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 19:15:29,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-07-21 19:15:29,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-07-21 19:15:29,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 19:15:29,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-07-21 19:15:29,476 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 23 [2020-07-21 19:15:29,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:15:29,476 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-07-21 19:15:29,477 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 19:15:29,477 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-07-21 19:15:29,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 19:15:29,478 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:15:29,478 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:15:29,691 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:15:29,692 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:15:29,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:15:29,693 INFO L82 PathProgramCache]: Analyzing trace with hash -849280247, now seen corresponding path program 2 times [2020-07-21 19:15:29,693 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:15:29,694 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1384047040] [2020-07-21 19:15:29,694 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 19:15:29,717 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:15:29,718 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:15:29,719 INFO L263 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 19:15:29,720 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:15:29,819 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:15:29,819 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:15:29,923 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1384047040] [2020-07-21 19:15:29,924 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 19:15:29,924 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-07-21 19:15:29,924 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [202217621] [2020-07-21 19:15:29,925 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-21 19:15:29,925 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:15:29,925 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-21 19:15:29,926 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-07-21 19:15:29,926 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 7 states. [2020-07-21 19:15:30,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:15:30,110 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-07-21 19:15:30,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 19:15:30,112 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 25 [2020-07-21 19:15:30,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:15:30,113 INFO L225 Difference]: With dead ends: 48 [2020-07-21 19:15:30,114 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 19:15:30,114 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-07-21 19:15:30,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 19:15:30,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-07-21 19:15:30,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-21 19:15:30,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2020-07-21 19:15:30,120 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 25 [2020-07-21 19:15:30,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:15:30,121 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2020-07-21 19:15:30,121 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-21 19:15:30,121 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2020-07-21 19:15:30,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 19:15:30,122 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:15:30,122 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:15:30,323 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:15:30,323 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:15:30,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:15:30,324 INFO L82 PathProgramCache]: Analyzing trace with hash -516331098, now seen corresponding path program 3 times [2020-07-21 19:15:30,325 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:15:30,325 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1438703781] [2020-07-21 19:15:30,326 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 19:15:30,368 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:15:30,368 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:15:30,369 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 19:15:30,372 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:15:32,896 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:15:32,897 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:15:33,032 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1438703781] [2020-07-21 19:15:33,032 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 19:15:33,033 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-07-21 19:15:33,033 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1715681172] [2020-07-21 19:15:33,033 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 19:15:33,033 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:15:33,034 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 19:15:33,034 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=71, Unknown=1, NotChecked=0, Total=90 [2020-07-21 19:15:33,034 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 9 states. [2020-07-21 19:15:48,658 WARN L193 SmtUtils]: Spent 2.04 s on a formula simplification that was a NOOP. DAG size: 19 [2020-07-21 19:15:50,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:15:50,993 INFO L93 Difference]: Finished difference Result 52 states and 62 transitions. [2020-07-21 19:15:50,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 19:15:50,995 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-21 19:15:50,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:15:50,996 INFO L225 Difference]: With dead ends: 52 [2020-07-21 19:15:50,996 INFO L226 Difference]: Without dead ends: 35 [2020-07-21 19:15:50,997 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=26, Invalid=105, Unknown=1, NotChecked=0, Total=132 [2020-07-21 19:15:50,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-07-21 19:15:51,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-07-21 19:15:51,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 19:15:51,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-07-21 19:15:51,005 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 27 [2020-07-21 19:15:51,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:15:51,005 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-07-21 19:15:51,005 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 19:15:51,006 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-07-21 19:15:51,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-21 19:15:51,006 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:15:51,007 INFO L422 BasicCegarLoop]: trace histogram [5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:15:51,209 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:15:51,210 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:15:51,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:15:51,211 INFO L82 PathProgramCache]: Analyzing trace with hash 1878386625, now seen corresponding path program 4 times [2020-07-21 19:15:51,211 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:15:51,212 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [124018510] [2020-07-21 19:15:51,212 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 19:15:51,258 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:15:51,259 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:15:51,260 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-21 19:15:51,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:15:51,526 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:15:51,526 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:15:51,578 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:15:51,578 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:15:51,579 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:15:51,582 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:15:51,583 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:15:51,584 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:15:51,585 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:15:51,800 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 5 [2020-07-21 19:15:53,326 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2020-07-21 19:15:54,223 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2020-07-21 19:15:55,277 WARN L193 SmtUtils]: Spent 236.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2020-07-21 19:15:56,922 WARN L193 SmtUtils]: Spent 270.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2020-07-21 19:15:58,852 WARN L193 SmtUtils]: Spent 342.00 ms on a formula simplification that was a NOOP. DAG size: 19 [2020-07-21 19:16:04,088 WARN L193 SmtUtils]: Spent 413.00 ms on a formula simplification that was a NOOP. DAG size: 24 [2020-07-21 19:16:10,998 WARN L193 SmtUtils]: Spent 402.00 ms on a formula simplification that was a NOOP. DAG size: 24 [2020-07-21 19:16:18,754 WARN L193 SmtUtils]: Spent 983.00 ms on a formula simplification that was a NOOP. DAG size: 26 [2020-07-21 19:16:19,073 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:16:19,074 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [124018510] [2020-07-21 19:16:19,074 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:16:19,074 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 26 [2020-07-21 19:16:19,074 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [10522624] [2020-07-21 19:16:19,075 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-21 19:16:19,075 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:16:19,075 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-21 19:16:19,076 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=548, Unknown=3, NotChecked=0, Total=650 [2020-07-21 19:16:19,076 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 26 states. [2020-07-21 19:17:05,691 WARN L193 SmtUtils]: Spent 18.78 s on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 19:17:46,974 WARN L193 SmtUtils]: Spent 7.67 s on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 19:18:14,043 WARN L193 SmtUtils]: Spent 3.90 s on a formula simplification that was a NOOP. DAG size: 21 [2020-07-21 19:19:14,423 WARN L193 SmtUtils]: Spent 20.71 s on a formula simplification that was a NOOP. DAG size: 33 [2020-07-21 19:20:25,637 WARN L193 SmtUtils]: Spent 36.28 s on a formula simplification that was a NOOP. DAG size: 38 [2020-07-21 19:20:42,749 WARN L838 $PredicateComparison]: unable to prove that (let ((.cse0 (* 2 c_gcd_test_~a)) (.cse1 (and (not (= 0 (mod |c_gcd_test_#in~a| (div |c_gcd_test_#in~a| 7)))) (= 0 (mod |c_gcd_test_#in~a| 7))))) (and (or (= (mod |c_gcd_test_#in~a| (+ (* c_gcd_test_~b (- 2)) c_gcd_test_~a)) 0) (not (= (* 5 c_gcd_test_~b) .cse0)) .cse1) (or (= 0 (mod |c_gcd_test_#in~a| c_gcd_test_~a)) .cse1) (or (= 0 (mod |c_gcd_test_#in~a| (+ (* c_gcd_test_~b (- 1)) c_gcd_test_~a))) (not (= (* 3 c_gcd_test_~b) .cse0)) .cse1) (or (= 0 (mod |c_gcd_test_#in~a| |c_gcd_test_#res|)) .cse1))) is different from false [2020-07-21 19:21:15,986 WARN L193 SmtUtils]: Spent 7.42 s on a formula simplification that was a NOOP. DAG size: 23 [2020-07-21 19:21:18,943 WARN L838 $PredicateComparison]: unable to prove that (let ((.cse2 (= 0 (mod |c_gcd_test_#in~a| c_gcd_test_~a))) (.cse0 (* 2 c_gcd_test_~a)) (.cse1 (and (not (= 0 (mod |c_gcd_test_#in~a| (div |c_gcd_test_#in~a| 7)))) (= 0 (mod |c_gcd_test_#in~a| 7))))) (and (or (= (mod |c_gcd_test_#in~a| (+ (* c_gcd_test_~b (- 2)) c_gcd_test_~a)) 0) (not (= (* 5 c_gcd_test_~b) .cse0)) .cse1) (or (not (= c_gcd_test_~a c_gcd_test_~b)) .cse2 .cse1) (or (not (= .cse0 c_gcd_test_~b)) .cse2 .cse1) (or (= 0 (mod |c_gcd_test_#in~a| (+ (* c_gcd_test_~b (- 1)) c_gcd_test_~a))) (not (= (* 3 c_gcd_test_~b) .cse0)) .cse1))) is different from false [2020-07-21 19:22:43,649 WARN L193 SmtUtils]: Spent 37.94 s on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 19:23:04,103 WARN L193 SmtUtils]: Spent 1.44 s on a formula simplification that was a NOOP. DAG size: 8 [2020-07-21 19:23:21,810 WARN L193 SmtUtils]: Spent 1.75 s on a formula simplification that was a NOOP. DAG size: 8 [2020-07-21 19:23:41,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:23:41,354 INFO L93 Difference]: Finished difference Result 79 states and 102 transitions. [2020-07-21 19:23:41,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-07-21 19:23:41,381 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 29 [2020-07-21 19:23:41,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:23:41,384 INFO L225 Difference]: With dead ends: 79 [2020-07-21 19:23:41,384 INFO L226 Difference]: Without dead ends: 76 [2020-07-21 19:23:41,385 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 30 SyntacticMatches, 3 SemanticMatches, 38 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 164 ImplicationChecksByTransitivity, 381.3s TimeCoverageRelationStatistics Valid=241, Invalid=1146, Unknown=27, NotChecked=146, Total=1560 [2020-07-21 19:23:41,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-07-21 19:23:41,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 70. [2020-07-21 19:23:41,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-21 19:23:41,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 91 transitions. [2020-07-21 19:23:41,399 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 91 transitions. Word has length 29 [2020-07-21 19:23:41,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:23:41,400 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 91 transitions. [2020-07-21 19:23:41,400 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-21 19:23:41,400 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 91 transitions. [2020-07-21 19:23:41,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-07-21 19:23:41,401 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:23:41,401 INFO L422 BasicCegarLoop]: trace histogram [7, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:23:41,603 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:23:41,604 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:23:41,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:23:41,605 INFO L82 PathProgramCache]: Analyzing trace with hash 808871355, now seen corresponding path program 5 times [2020-07-21 19:23:41,605 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:23:41,606 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [143559068] [2020-07-21 19:23:41,606 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 19:23:41,629 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:23:41,630 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:23:41,630 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 19:23:41,632 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:23:43,392 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 19:23:43,392 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:23:44,337 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [143559068] [2020-07-21 19:23:44,338 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 19:23:44,338 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-07-21 19:23:44,339 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1314367356] [2020-07-21 19:23:44,339 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 19:23:44,339 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:23:44,340 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 19:23:44,340 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-07-21 19:23:44,340 INFO L87 Difference]: Start difference. First operand 70 states and 91 transitions. Second operand 9 states. [2020-07-21 19:23:53,487 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 12 [2020-07-21 19:23:57,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:23:57,919 INFO L93 Difference]: Finished difference Result 98 states and 126 transitions. [2020-07-21 19:23:57,932 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 19:23:57,932 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 33 [2020-07-21 19:23:57,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:23:57,935 INFO L225 Difference]: With dead ends: 98 [2020-07-21 19:23:57,935 INFO L226 Difference]: Without dead ends: 62 [2020-07-21 19:23:57,936 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=22, Invalid=87, Unknown=1, NotChecked=0, Total=110 [2020-07-21 19:23:57,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-07-21 19:23:57,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2020-07-21 19:23:57,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-07-21 19:23:57,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 78 transitions. [2020-07-21 19:23:57,945 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 78 transitions. Word has length 33 [2020-07-21 19:23:57,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:23:57,945 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 78 transitions. [2020-07-21 19:23:57,945 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 19:23:57,945 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 78 transitions. [2020-07-21 19:23:57,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-07-21 19:23:57,947 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:23:57,947 INFO L422 BasicCegarLoop]: trace histogram [7, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:23:58,156 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:23:58,157 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:23:58,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:23:58,158 INFO L82 PathProgramCache]: Analyzing trace with hash 190781115, now seen corresponding path program 6 times [2020-07-21 19:23:58,158 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:23:58,159 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1805370856] [2020-07-21 19:23:58,159 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 19:23:58,197 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:23:58,197 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:23:58,198 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:23:58,199 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:23:58,208 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2020-07-21 19:23:58,209 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:23:58,209 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1805370856] [2020-07-21 19:23:58,209 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:23:58,209 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:23:58,210 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1220436256] [2020-07-21 19:23:58,210 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:23:58,210 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:23:58,210 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:23:58,210 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:23:58,211 INFO L87 Difference]: Start difference. First operand 62 states and 78 transitions. Second operand 3 states. [2020-07-21 19:23:58,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:23:58,243 INFO L93 Difference]: Finished difference Result 86 states and 105 transitions. [2020-07-21 19:23:58,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:23:58,247 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 33 [2020-07-21 19:23:58,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:23:58,248 INFO L225 Difference]: With dead ends: 86 [2020-07-21 19:23:58,248 INFO L226 Difference]: Without dead ends: 64 [2020-07-21 19:23:58,249 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:23:58,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-21 19:23:58,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2020-07-21 19:23:58,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-07-21 19:23:58,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 78 transitions. [2020-07-21 19:23:58,272 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 78 transitions. Word has length 33 [2020-07-21 19:23:58,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:23:58,272 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 78 transitions. [2020-07-21 19:23:58,273 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:23:58,273 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 78 transitions. [2020-07-21 19:23:58,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-07-21 19:23:58,279 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:23:58,279 INFO L422 BasicCegarLoop]: trace histogram [5, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:23:58,480 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:23:58,480 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:23:58,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:23:58,480 INFO L82 PathProgramCache]: Analyzing trace with hash -825201876, now seen corresponding path program 1 times [2020-07-21 19:23:58,481 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:23:58,481 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1061260072] [2020-07-21 19:23:58,481 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 19:23:58,531 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:23:58,531 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:23:58,532 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 29 conjunts are in the unsatisfiable core [2020-07-21 19:23:58,534 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:23:58,791 WARN L193 SmtUtils]: Spent 183.00 ms on a formula simplification that was a NOOP. DAG size: 7 [2020-07-21 19:24:00,528 WARN L193 SmtUtils]: Spent 184.00 ms on a formula simplification that was a NOOP. DAG size: 9 [2020-07-21 19:24:01,588 WARN L193 SmtUtils]: Spent 180.00 ms on a formula simplification that was a NOOP. DAG size: 7 [2020-07-21 19:24:02,096 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:24:02,096 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:24:02,595 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:02,596 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:02,597 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:02,597 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:02,598 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:02,599 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:02,599 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:02,600 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:02,601 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:02,601 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:02,602 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:02,602 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:02,603 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:02,604 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:02,604 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:05,216 WARN L193 SmtUtils]: Spent 2.02 s on a formula simplification. DAG size of input: 27 DAG size of output: 5 [2020-07-21 19:24:08,183 WARN L193 SmtUtils]: Spent 208.00 ms on a formula simplification that was a NOOP. DAG size: 5 [2020-07-21 19:24:14,856 WARN L193 SmtUtils]: Spent 1.26 s on a formula simplification that was a NOOP. DAG size: 11 [2020-07-21 19:24:14,858 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:35,394 WARN L193 SmtUtils]: Spent 3.98 s on a formula simplification that was a NOOP. DAG size: 18 [2020-07-21 19:25:01,502 WARN L193 SmtUtils]: Spent 3.65 s on a formula simplification that was a NOOP. DAG size: 21 [2020-07-21 19:25:23,037 WARN L193 SmtUtils]: Spent 8.04 s on a formula simplification that was a NOOP. DAG size: 25 [2020-07-21 19:25:45,151 WARN L193 SmtUtils]: Spent 6.17 s on a formula simplification that was a NOOP. DAG size: 25 [2020-07-21 19:26:03,869 WARN L193 SmtUtils]: Spent 3.30 s on a formula simplification that was a NOOP. DAG size: 27 [2020-07-21 19:26:31,992 WARN L193 SmtUtils]: Spent 9.34 s on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 19:27:01,049 WARN L193 SmtUtils]: Spent 8.43 s on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 19:27:26,877 WARN L193 SmtUtils]: Spent 5.71 s on a formula simplification that was a NOOP. DAG size: 34 [2020-07-21 19:27:28,998 WARN L860 $PredicateComparison]: unable to prove that (let ((.cse0 (not (= 0 (mod (* |c_gcd_test_#in~a| 5) (- 7)))))) (and (or .cse0 (forall ((v_main_~y~0_BEFORE_CALL_14 Int)) (or (= 0 (mod v_main_~y~0_BEFORE_CALL_14 (+ |c_gcd_test_#in~a| (* (div (* |c_gcd_test_#in~a| (- 2)) (- 7)) (- 3))))) (not (= 0 (mod v_main_~y~0_BEFORE_CALL_14 (div |c_gcd_test_#in~a| 7))))))) (or .cse0 (= 0 (mod |c_gcd_test_#in~a| 7)) (forall ((v_prenex_2 Int)) (= (mod v_prenex_2 (+ |c_gcd_test_#in~a| (* (div (* |c_gcd_test_#in~a| (- 2)) (- 7)) (- 3)))) 0))))) is different from true [2020-07-21 19:27:29,018 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:27:29,019 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1061260072] [2020-07-21 19:27:29,019 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:27:29,019 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 16] total 27 [2020-07-21 19:27:29,019 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [900149896] [2020-07-21 19:27:29,020 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 19:27:29,020 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:27:29,020 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 19:27:29,021 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=575, Unknown=22, NotChecked=48, Total=702 [2020-07-21 19:27:29,021 INFO L87 Difference]: Start difference. First operand 64 states and 78 transitions. Second operand 27 states. [2020-07-21 19:27:50,791 WARN L193 SmtUtils]: Spent 13.98 s on a formula simplification. DAG size of input: 35 DAG size of output: 28 [2020-07-21 19:28:32,716 WARN L193 SmtUtils]: Spent 23.79 s on a formula simplification. DAG size of input: 47 DAG size of output: 26 [2020-07-21 19:28:59,303 WARN L193 SmtUtils]: Spent 14.72 s on a formula simplification. DAG size of input: 34 DAG size of output: 27 [2020-07-21 19:29:03,655 WARN L860 $PredicateComparison]: unable to prove that (let ((.cse0 (not (= c_gcd_test_~b 0))) (.cse2 (not (= (* 5 c_gcd_test_~b) (* 2 c_gcd_test_~a)))) (.cse1 (= 0 (mod |c_gcd_test_#in~a| 7)))) (and (= (+ c_gcd_test_~b c_gcd_test_~a) |c_gcd_test_#in~a|) (or .cse0 (forall ((v_prenex_2 Int)) (= 0 (mod v_prenex_2 c_gcd_test_~a))) .cse1) (or (forall ((v_main_~y~0_BEFORE_CALL_14 Int)) (or (not (= 0 (mod v_main_~y~0_BEFORE_CALL_14 (div |c_gcd_test_#in~a| 7)))) (= 0 (mod v_main_~y~0_BEFORE_CALL_14 c_gcd_test_~a)))) .cse0) (or (forall ((v_main_~y~0_BEFORE_CALL_14 Int)) (or (= 0 (mod v_main_~y~0_BEFORE_CALL_14 (+ (* c_gcd_test_~b (- 2)) c_gcd_test_~a))) (not (= 0 (mod v_main_~y~0_BEFORE_CALL_14 (div |c_gcd_test_#in~a| 7)))))) .cse2) (or (forall ((v_prenex_2 Int)) (= 0 (mod v_prenex_2 (+ (* c_gcd_test_~b (- 2)) c_gcd_test_~a)))) .cse2 .cse1))) is different from true [2020-07-21 19:29:23,858 WARN L193 SmtUtils]: Spent 15.05 s on a formula simplification. DAG size of input: 35 DAG size of output: 28 [2020-07-21 19:29:28,759 WARN L860 $PredicateComparison]: unable to prove that (let ((.cse0 (not (= c_gcd_test_~b 0))) (.cse1 (= 0 (mod |c_gcd_test_#in~a| 7))) (.cse2 (not (= (* 3 c_gcd_test_~b) (* 2 c_gcd_test_~a))))) (and (or .cse0 (forall ((v_prenex_2 Int)) (= 0 (mod v_prenex_2 c_gcd_test_~a))) .cse1) (or (forall ((v_main_~y~0_BEFORE_CALL_14 Int)) (or (not (= 0 (mod v_main_~y~0_BEFORE_CALL_14 (div |c_gcd_test_#in~a| 7)))) (= 0 (mod v_main_~y~0_BEFORE_CALL_14 c_gcd_test_~a)))) .cse0) (or (forall ((v_prenex_2 Int)) (= 0 (mod v_prenex_2 (+ (* c_gcd_test_~b (- 1)) c_gcd_test_~a)))) .cse2 .cse1) (= (+ (* 2 c_gcd_test_~b) c_gcd_test_~a) |c_gcd_test_#in~a|) (or (forall ((v_main_~y~0_BEFORE_CALL_14 Int)) (or (= (mod v_main_~y~0_BEFORE_CALL_14 (+ (* c_gcd_test_~b (- 1)) c_gcd_test_~a)) 0) (not (= 0 (mod v_main_~y~0_BEFORE_CALL_14 (div |c_gcd_test_#in~a| 7)))))) .cse2))) is different from true [2020-07-21 19:29:42,756 WARN L193 SmtUtils]: Spent 8.11 s on a formula simplification. DAG size of input: 31 DAG size of output: 7