/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/recursive-simple/id_i10_o10-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 19:44:04,654 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-07-21 19:44:04,691 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 19:44:04,694 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 19:44:04,697 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 19:44:04,715 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 19:44:04,721 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 19:44:04,724 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 19:44:04,729 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 19:44:04,731 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 19:44:04,732 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 19:44:04,736 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 19:44:04,738 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 19:44:04,743 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 19:44:04,746 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 19:44:04,748 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 19:44:04,751 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 19:44:04,760 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 19:44:04,768 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 19:44:04,773 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 19:44:04,775 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 19:44:04,776 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 19:44:04,780 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 19:44:04,804 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 19:44:04,839 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 19:44:04,839 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 19:44:04,843 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 19:44:04,844 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 19:44:04,844 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 19:44:04,844 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 19:44:04,845 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 19:44:04,845 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 19:44:04,845 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 19:44:04,845 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 19:44:04,847 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 19:44:04,847 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 19:44:04,848 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 19:44:04,849 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 19:44:04,849 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 19:44:04,849 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 19:44:04,849 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 19:44:04,850 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 19:44:04,850 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 19:44:04,850 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 19:44:04,850 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 19:44:04,851 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 19:44:04,851 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 19:44:04,851 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 19:44:04,851 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 19:44:04,851 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 19:44:04,852 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:04,852 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 19:44:04,852 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 19:44:04,852 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 19:44:05,255 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 19:44:05,275 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 19:44:05,281 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 19:44:05,284 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 19:44:05,285 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 19:44:05,286 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_i10_o10-2.c [2020-07-21 19:44:05,385 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d815aa34c/d15593e7cc65444fba9393453600f19c/FLAGec49d5ce9 [2020-07-21 19:44:06,017 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 19:44:06,018 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id_i10_o10-2.c [2020-07-21 19:44:06,029 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d815aa34c/d15593e7cc65444fba9393453600f19c/FLAGec49d5ce9 [2020-07-21 19:44:06,337 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d815aa34c/d15593e7cc65444fba9393453600f19c [2020-07-21 19:44:06,350 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 19:44:06,353 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 19:44:06,355 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 19:44:06,355 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 19:44:06,361 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 19:44:06,362 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 07:44:06" (1/1) ... [2020-07-21 19:44:06,367 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@380caa3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:44:06, skipping insertion in model container [2020-07-21 19:44:06,368 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 07:44:06" (1/1) ... [2020-07-21 19:44:06,378 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 19:44:06,400 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 19:44:06,606 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 19:44:06,613 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 19:44:06,635 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 19:44:06,655 INFO L208 MainTranslator]: Completed translation [2020-07-21 19:44:06,656 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:44:06 WrapperNode [2020-07-21 19:44:06,657 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 19:44:06,658 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 19:44:06,659 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 19:44:06,659 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 19:44:06,679 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:44:06" (1/1) ... [2020-07-21 19:44:06,680 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:44:06" (1/1) ... [2020-07-21 19:44:06,688 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:44:06" (1/1) ... [2020-07-21 19:44:06,689 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:44:06" (1/1) ... [2020-07-21 19:44:06,695 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:44:06" (1/1) ... [2020-07-21 19:44:06,698 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:44:06" (1/1) ... [2020-07-21 19:44:06,700 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:44:06" (1/1) ... [2020-07-21 19:44:06,702 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 19:44:06,703 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 19:44:06,703 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 19:44:06,703 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 19:44:06,705 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:44:06" (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 19:44:06,907 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 19:44:06,907 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 19:44:06,907 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-07-21 19:44:06,907 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 19:44:06,908 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 19:44:06,908 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 19:44:06,908 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-07-21 19:44:06,908 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 19:44:06,909 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 19:44:06,909 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 19:44:07,128 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 19:44:07,129 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 19:44:07,135 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 07:44:07 BoogieIcfgContainer [2020-07-21 19:44:07,135 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 19:44:07,137 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 19:44:07,137 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 19:44:07,142 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 19:44:07,143 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 07:44:06" (1/3) ... [2020-07-21 19:44:07,146 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7c217dcb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 07:44:07, skipping insertion in model container [2020-07-21 19:44:07,146 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:44:06" (2/3) ... [2020-07-21 19:44:07,147 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7c217dcb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 07:44:07, skipping insertion in model container [2020-07-21 19:44:07,148 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 07:44:07" (3/3) ... [2020-07-21 19:44:07,152 INFO L109 eAbstractionObserver]: Analyzing ICFG id_i10_o10-2.c [2020-07-21 19:44:07,165 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 19:44:07,178 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 19:44:07,202 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 19:44:07,247 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 19:44:07,248 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 19:44:07,249 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 19:44:07,249 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 19:44:07,250 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 19:44:07,250 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 19:44:07,250 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 19:44:07,250 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 19:44:07,272 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-21 19:44:07,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 19:44:07,282 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:44:07,284 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:44:07,285 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:44:07,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:44:07,293 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2020-07-21 19:44:07,308 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:44:07,308 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [897021034] [2020-07-21 19:44:07,309 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 19:44:07,398 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:44:07,398 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:44:07,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 19:44:07,411 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:44:07,575 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 19:44:07,575 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:44:07,577 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [897021034] [2020-07-21 19:44:07,578 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:44:07,579 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 19:44:07,581 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1354509258] [2020-07-21 19:44:07,589 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 19:44:07,590 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:07,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 19:44:07,613 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 19:44:07,617 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-07-21 19:44:07,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:07,742 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2020-07-21 19:44:07,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 19:44:07,746 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 19:44:07,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:07,761 INFO L225 Difference]: With dead ends: 30 [2020-07-21 19:44:07,762 INFO L226 Difference]: Without dead ends: 18 [2020-07-21 19:44:07,768 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 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 19:44:07,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-21 19:44:07,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-21 19:44:07,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-21 19:44:07,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-07-21 19:44:07,829 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-07-21 19:44:07,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:07,830 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-07-21 19:44:07,830 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 19:44:07,830 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-07-21 19:44:07,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 19:44:07,833 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:44:07,833 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:44:08,047 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:08,048 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:44:08,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:44:08,048 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2020-07-21 19:44:08,049 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:44:08,049 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [315073379] [2020-07-21 19:44:08,050 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 19:44:08,093 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:44:08,094 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:44:08,095 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 19:44:08,099 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:44:08,190 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 19:44:08,190 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:44:08,434 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:08,441 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:08,493 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 19:44:08,494 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [315073379] [2020-07-21 19:44:08,495 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:44:08,495 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 19:44:08,496 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1320401943] [2020-07-21 19:44:08,498 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 19:44:08,498 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:08,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 19:44:08,499 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 19:44:08,499 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 9 states. [2020-07-21 19:44:08,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:08,590 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2020-07-21 19:44:08,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 19:44:08,592 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-07-21 19:44:08,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:08,593 INFO L225 Difference]: With dead ends: 25 [2020-07-21 19:44:08,593 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 19:44:08,595 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 26 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 19:44:08,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 19:44:08,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 19:44:08,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 19:44:08,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-07-21 19:44:08,606 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2020-07-21 19:44:08,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:08,606 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-07-21 19:44:08,607 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 19:44:08,607 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-07-21 19:44:08,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 19:44:08,609 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:44:08,609 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:44:08,822 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:08,823 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:44:08,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:44:08,827 INFO L82 PathProgramCache]: Analyzing trace with hash 397359997, now seen corresponding path program 2 times [2020-07-21 19:44:08,828 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:44:08,828 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [737457129] [2020-07-21 19:44:08,829 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 19:44:08,923 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:44:08,923 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:44:08,925 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 19:44:08,930 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:44:09,023 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-07-21 19:44:09,024 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:44:09,337 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:09,340 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:09,421 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:09,424 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:09,479 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 19:44:09,480 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [737457129] [2020-07-21 19:44:09,480 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:44:09,480 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 19:44:09,481 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2058711712] [2020-07-21 19:44:09,482 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 19:44:09,483 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:09,483 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 19:44:09,484 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 19:44:09,484 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 11 states. [2020-07-21 19:44:09,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:09,593 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2020-07-21 19:44:09,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 19:44:09,594 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 25 [2020-07-21 19:44:09,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:09,596 INFO L225 Difference]: With dead ends: 28 [2020-07-21 19:44:09,596 INFO L226 Difference]: Without dead ends: 24 [2020-07-21 19:44:09,597 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 34 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 19:44:09,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-21 19:44:09,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-21 19:44:09,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-21 19:44:09,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-07-21 19:44:09,607 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2020-07-21 19:44:09,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:09,608 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-07-21 19:44:09,608 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 19:44:09,608 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-07-21 19:44:09,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 19:44:09,611 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:44:09,611 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:44:09,825 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:09,826 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:44:09,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:44:09,827 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 3 times [2020-07-21 19:44:09,828 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:44:09,829 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [477805858] [2020-07-21 19:44:09,829 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 19:44:09,877 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:44:09,877 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:44:09,879 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 19:44:09,882 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:44:09,951 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-21 19:44:09,951 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:44:10,434 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:10,562 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:10,650 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:10,706 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 19:44:10,707 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [477805858] [2020-07-21 19:44:10,707 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:44:10,707 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 19:44:10,707 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [755276681] [2020-07-21 19:44:10,708 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 19:44:10,709 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:10,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 19:44:10,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 19:44:10,710 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 13 states. [2020-07-21 19:44:10,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:10,830 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2020-07-21 19:44:10,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 19:44:10,831 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 31 [2020-07-21 19:44:10,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:10,833 INFO L225 Difference]: With dead ends: 31 [2020-07-21 19:44:10,833 INFO L226 Difference]: Without dead ends: 27 [2020-07-21 19:44:10,834 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 42 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-21 19:44:10,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-07-21 19:44:10,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-07-21 19:44:10,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-21 19:44:10,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-07-21 19:44:10,842 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 31 [2020-07-21 19:44:10,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:10,843 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-07-21 19:44:10,843 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 19:44:10,843 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-07-21 19:44:10,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-07-21 19:44:10,845 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:44:10,845 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:44:11,046 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:11,047 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:44:11,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:44:11,048 INFO L82 PathProgramCache]: Analyzing trace with hash 1080764669, now seen corresponding path program 4 times [2020-07-21 19:44:11,049 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:44:11,049 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [89862059] [2020-07-21 19:44:11,049 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 19:44:11,087 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:44:11,088 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:44:11,089 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 19:44:11,092 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:44:11,175 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-07-21 19:44:11,175 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:44:11,806 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:11,808 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:11,973 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:11,975 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:12,071 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:12,072 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:12,129 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:12,130 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:12,183 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-07-21 19:44:12,184 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [89862059] [2020-07-21 19:44:12,184 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:44:12,184 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 19:44:12,185 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2094100587] [2020-07-21 19:44:12,185 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 19:44:12,186 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:12,186 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 19:44:12,187 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 19:44:12,187 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 15 states. [2020-07-21 19:44:12,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:12,321 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2020-07-21 19:44:12,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 19:44:12,325 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-07-21 19:44:12,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:12,327 INFO L225 Difference]: With dead ends: 34 [2020-07-21 19:44:12,327 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 19:44:12,328 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 50 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-21 19:44:12,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 19:44:12,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-21 19:44:12,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 19:44:12,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2020-07-21 19:44:12,341 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 37 [2020-07-21 19:44:12,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:12,342 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2020-07-21 19:44:12,342 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 19:44:12,342 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2020-07-21 19:44:12,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-07-21 19:44:12,344 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:44:12,344 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:44:12,556 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:12,556 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:44:12,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:44:12,558 INFO L82 PathProgramCache]: Analyzing trace with hash -1752970513, now seen corresponding path program 5 times [2020-07-21 19:44:12,559 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:44:12,559 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [152016035] [2020-07-21 19:44:12,559 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 19:44:12,621 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:44:12,622 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:44:12,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 19:44:12,631 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:44:12,726 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-21 19:44:12,726 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:44:13,646 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:13,889 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:13,891 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:14,049 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:14,051 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:14,167 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:14,168 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:14,235 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:14,236 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:14,327 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-21 19:44:14,327 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [152016035] [2020-07-21 19:44:14,328 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:44:14,328 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 19:44:14,328 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [753282240] [2020-07-21 19:44:14,329 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 19:44:14,329 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:14,330 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 19:44:14,330 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 19:44:14,330 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 17 states. [2020-07-21 19:44:14,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:14,502 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2020-07-21 19:44:14,502 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 19:44:14,503 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 43 [2020-07-21 19:44:14,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:14,505 INFO L225 Difference]: With dead ends: 37 [2020-07-21 19:44:14,505 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 19:44:14,510 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 58 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:44:14,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 19:44:14,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-07-21 19:44:14,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-21 19:44:14,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-07-21 19:44:14,529 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 43 [2020-07-21 19:44:14,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:14,531 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-07-21 19:44:14,531 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 19:44:14,531 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-07-21 19:44:14,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-07-21 19:44:14,542 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:44:14,542 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:44:14,757 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:14,758 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:44:14,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:44:14,759 INFO L82 PathProgramCache]: Analyzing trace with hash -1590630787, now seen corresponding path program 6 times [2020-07-21 19:44:14,759 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:44:14,759 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1563213545] [2020-07-21 19:44:14,759 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 19:44:14,821 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:44:14,821 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:44:14,822 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 19:44:14,826 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:44:14,928 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2020-07-21 19:44:14,929 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:44:16,204 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:16,555 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:16,556 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:16,801 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:16,804 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:16,989 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:16,991 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:17,097 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:17,099 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:17,153 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:17,154 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:17,201 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 93 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-21 19:44:17,202 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1563213545] [2020-07-21 19:44:17,202 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:44:17,202 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-21 19:44:17,203 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [556829414] [2020-07-21 19:44:17,204 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 19:44:17,204 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:17,204 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 19:44:17,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-21 19:44:17,205 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 19 states. [2020-07-21 19:44:17,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:17,413 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2020-07-21 19:44:17,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 19:44:17,415 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 49 [2020-07-21 19:44:17,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:17,416 INFO L225 Difference]: With dead ends: 40 [2020-07-21 19:44:17,416 INFO L226 Difference]: Without dead ends: 36 [2020-07-21 19:44:17,418 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 66 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-21 19:44:17,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-21 19:44:17,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-07-21 19:44:17,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 19:44:17,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2020-07-21 19:44:17,426 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 49 [2020-07-21 19:44:17,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:17,426 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2020-07-21 19:44:17,426 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 19:44:17,427 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2020-07-21 19:44:17,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-07-21 19:44:17,428 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:44:17,429 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:44:17,641 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:17,642 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:44:17,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:44:17,643 INFO L82 PathProgramCache]: Analyzing trace with hash 1532150511, now seen corresponding path program 7 times [2020-07-21 19:44:17,644 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:44:17,644 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2036453807] [2020-07-21 19:44:17,645 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 19:44:17,747 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:44:17,748 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:44:17,749 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 19:44:17,758 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:44:17,860 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-07-21 19:44:17,860 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:44:19,565 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:19,566 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:20,127 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:20,129 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:20,484 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:20,485 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:20,722 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:20,723 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:20,882 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:20,984 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:21,040 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:21,094 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-07-21 19:44:21,095 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2036453807] [2020-07-21 19:44:21,095 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:44:21,096 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-21 19:44:21,096 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1876695381] [2020-07-21 19:44:21,097 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 19:44:21,097 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:21,098 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 19:44:21,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-21 19:44:21,099 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 21 states. [2020-07-21 19:44:21,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:21,348 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2020-07-21 19:44:21,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 19:44:21,349 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 55 [2020-07-21 19:44:21,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:21,351 INFO L225 Difference]: With dead ends: 43 [2020-07-21 19:44:21,352 INFO L226 Difference]: Without dead ends: 39 [2020-07-21 19:44:21,353 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 74 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-21 19:44:21,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-07-21 19:44:21,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-07-21 19:44:21,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-07-21 19:44:21,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-07-21 19:44:21,363 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 55 [2020-07-21 19:44:21,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:21,364 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-07-21 19:44:21,364 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 19:44:21,364 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-07-21 19:44:21,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-07-21 19:44:21,366 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:44:21,366 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:44:21,571 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:21,572 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:44:21,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:44:21,573 INFO L82 PathProgramCache]: Analyzing trace with hash 1140618237, now seen corresponding path program 8 times [2020-07-21 19:44:21,574 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:44:21,574 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [691356542] [2020-07-21 19:44:21,574 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 19:44:21,704 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:44:21,704 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:44:21,706 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 19:44:21,709 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:44:21,869 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-07-21 19:44:21,870 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:44:24,226 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:25,010 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:25,558 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:25,928 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:26,167 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:26,338 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:26,340 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:26,443 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:26,444 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:26,505 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:26,507 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:26,587 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 164 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-07-21 19:44:26,588 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [691356542] [2020-07-21 19:44:26,589 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:44:26,589 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-21 19:44:26,590 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1451719663] [2020-07-21 19:44:26,591 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 19:44:26,593 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:26,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 19:44:26,595 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:44:26,595 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 23 states. [2020-07-21 19:44:26,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:26,864 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2020-07-21 19:44:26,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 19:44:26,865 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 61 [2020-07-21 19:44:26,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:26,867 INFO L225 Difference]: With dead ends: 46 [2020-07-21 19:44:26,867 INFO L226 Difference]: Without dead ends: 42 [2020-07-21 19:44:26,872 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 82 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-21 19:44:26,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-21 19:44:26,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-07-21 19:44:26,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-07-21 19:44:26,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2020-07-21 19:44:26,881 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 61 [2020-07-21 19:44:26,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:26,882 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2020-07-21 19:44:26,882 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 19:44:26,882 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2020-07-21 19:44:26,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-21 19:44:26,883 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:44:26,884 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:44:27,090 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:27,092 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:44:27,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:44:27,092 INFO L82 PathProgramCache]: Analyzing trace with hash -1749177617, now seen corresponding path program 9 times [2020-07-21 19:44:27,093 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:44:27,094 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [7042807] [2020-07-21 19:44:27,094 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 19:44:27,259 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:44:27,260 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:44:27,261 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 19:44:27,267 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:44:27,413 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2020-07-21 19:44:27,413 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:44:30,653 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:30,655 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:31,756 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:31,758 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:32,559 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:32,561 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:33,185 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:33,186 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:33,569 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:33,570 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:33,822 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:33,998 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:34,100 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:34,156 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:34,157 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:34,219 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 207 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2020-07-21 19:44:34,220 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [7042807] [2020-07-21 19:44:34,220 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:44:34,221 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 24 [2020-07-21 19:44:34,221 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1886946359] [2020-07-21 19:44:34,222 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 19:44:34,222 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:34,222 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 19:44:34,223 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=397, Unknown=0, NotChecked=0, Total=552 [2020-07-21 19:44:34,223 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 24 states. [2020-07-21 19:44:34,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:34,468 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2020-07-21 19:44:34,469 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 19:44:34,470 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 67 [2020-07-21 19:44:34,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:34,471 INFO L225 Difference]: With dead ends: 49 [2020-07-21 19:44:34,472 INFO L226 Difference]: Without dead ends: 45 [2020-07-21 19:44:34,473 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 90 SyntacticMatches, 21 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 261 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=385, Invalid=737, Unknown=0, NotChecked=0, Total=1122 [2020-07-21 19:44:34,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-07-21 19:44:34,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-07-21 19:44:34,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-21 19:44:34,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2020-07-21 19:44:34,482 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 67 [2020-07-21 19:44:34,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:34,483 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2020-07-21 19:44:34,483 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 19:44:34,483 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2020-07-21 19:44:34,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-07-21 19:44:34,485 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:44:34,485 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:44:34,701 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:34,702 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:44:34,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:44:34,703 INFO L82 PathProgramCache]: Analyzing trace with hash -1580609155, now seen corresponding path program 10 times [2020-07-21 19:44:34,704 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:44:34,704 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [894165087] [2020-07-21 19:44:34,704 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 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 19:44:34,901 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:44:34,901 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:44:34,904 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 47 conjunts are in the unsatisfiable core [2020-07-21 19:44:34,907 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:44:35,369 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2020-07-21 19:44:35,370 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:44:36,721 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2020-07-21 19:44:36,722 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [894165087] [2020-07-21 19:44:36,722 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:44:36,722 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 25 [2020-07-21 19:44:36,722 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [291174987] [2020-07-21 19:44:36,723 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 19:44:36,724 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:36,724 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 19:44:36,724 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-07-21 19:44:36,725 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 25 states. [2020-07-21 19:44:37,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:37,102 INFO L93 Difference]: Finished difference Result 52 states and 53 transitions. [2020-07-21 19:44:37,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-21 19:44:37,103 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 73 [2020-07-21 19:44:37,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:37,105 INFO L225 Difference]: With dead ends: 52 [2020-07-21 19:44:37,107 INFO L226 Difference]: Without dead ends: 48 [2020-07-21 19:44:37,108 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-07-21 19:44:37,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-21 19:44:37,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-07-21 19:44:37,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-07-21 19:44:37,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2020-07-21 19:44:37,133 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 73 [2020-07-21 19:44:37,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:37,134 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2020-07-21 19:44:37,134 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 19:44:37,138 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2020-07-21 19:44:37,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-07-21 19:44:37,140 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:44:37,140 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:44:37,355 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:37,356 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:44:37,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:44:37,356 INFO L82 PathProgramCache]: Analyzing trace with hash -223837457, now seen corresponding path program 11 times [2020-07-21 19:44:37,357 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:44:37,357 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1340772065] [2020-07-21 19:44:37,357 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 19:44:37,560 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:44:37,560 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:44:37,562 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 19:44:37,565 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:44:37,758 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 187 proven. 0 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2020-07-21 19:44:37,759 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:44:37,759 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1340772065] [2020-07-21 19:44:37,760 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:44:37,760 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2020-07-21 19:44:37,761 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1496268610] [2020-07-21 19:44:37,762 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 19:44:37,762 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:37,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 19:44:37,763 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=145, Unknown=0, NotChecked=0, Total=240 [2020-07-21 19:44:37,763 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand 16 states. [2020-07-21 19:44:37,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:37,997 INFO L93 Difference]: Finished difference Result 48 states and 49 transitions. [2020-07-21 19:44:37,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 19:44:37,997 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 79 [2020-07-21 19:44:37,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:37,998 INFO L225 Difference]: With dead ends: 48 [2020-07-21 19:44:37,998 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 19:44:38,000 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=275, Invalid=481, Unknown=0, NotChecked=0, Total=756 [2020-07-21 19:44:38,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 19:44:38,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 19:44:38,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 19:44:38,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 19:44:38,001 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 79 [2020-07-21 19:44:38,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:38,001 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 19:44:38,001 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 19:44:38,002 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 19:44:38,002 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 19:44:38,202 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:38,206 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 19:44:38,280 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 19:44:38,280 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 19:44:38,280 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 19:44:38,280 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 19:44:38,280 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 19:44:38,281 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 19:44:38,281 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 13) no Hoare annotation was computed. [2020-07-21 19:44:38,281 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 9 15) the Hoare annotation is: true [2020-07-21 19:44:38,281 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 9 15) no Hoare annotation was computed. [2020-07-21 19:44:38,281 INFO L268 CegarLoopResult]: For program point L13(line 13) no Hoare annotation was computed. [2020-07-21 19:44:38,281 INFO L268 CegarLoopResult]: For program point L12(lines 12 14) no Hoare annotation was computed. [2020-07-21 19:44:38,282 INFO L264 CegarLoopResult]: At program point L11(line 11) the Hoare annotation is: (and (<= 10 main_~input~0) (<= main_~input~0 10)) [2020-07-21 19:44:38,282 INFO L268 CegarLoopResult]: For program point L11-1(line 11) no Hoare annotation was computed. [2020-07-21 19:44:38,282 INFO L268 CegarLoopResult]: For program point L12-2(lines 9 15) no Hoare annotation was computed. [2020-07-21 19:44:38,282 INFO L268 CegarLoopResult]: For program point idFINAL(lines 4 7) no Hoare annotation was computed. [2020-07-21 19:44:38,282 INFO L268 CegarLoopResult]: For program point idEXIT(lines 4 7) no Hoare annotation was computed. [2020-07-21 19:44:38,283 INFO L271 CegarLoopResult]: At program point idENTRY(lines 4 7) the Hoare annotation is: true [2020-07-21 19:44:38,283 INFO L264 CegarLoopResult]: At program point L6(line 6) the Hoare annotation is: (and (<= |id_#in~x| id_~x) (<= id_~x |id_#in~x|)) [2020-07-21 19:44:38,283 INFO L268 CegarLoopResult]: For program point L5(line 5) no Hoare annotation was computed. [2020-07-21 19:44:38,283 INFO L268 CegarLoopResult]: For program point L6-1(line 6) no Hoare annotation was computed. [2020-07-21 19:44:38,290 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 07:44:38 BoogieIcfgContainer [2020-07-21 19:44:38,290 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 19:44:38,293 INFO L168 Benchmark]: Toolchain (without parser) took 31940.62 ms. Allocated memory was 137.9 MB in the beginning and 435.2 MB in the end (delta: 297.3 MB). Free memory was 103.2 MB in the beginning and 336.6 MB in the end (delta: -233.3 MB). Peak memory consumption was 63.9 MB. Max. memory is 7.1 GB. [2020-07-21 19:44:38,294 INFO L168 Benchmark]: CDTParser took 0.45 ms. Allocated memory is still 137.9 MB. Free memory was 120.9 MB in the beginning and 120.7 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. [2020-07-21 19:44:38,300 INFO L168 Benchmark]: CACSL2BoogieTranslator took 302.90 ms. Allocated memory is still 137.9 MB. Free memory was 102.8 MB in the beginning and 93.6 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. [2020-07-21 19:44:38,300 INFO L168 Benchmark]: Boogie Preprocessor took 44.05 ms. Allocated memory is still 137.9 MB. Free memory was 93.6 MB in the beginning and 92.2 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-07-21 19:44:38,301 INFO L168 Benchmark]: RCFGBuilder took 432.39 ms. Allocated memory was 137.9 MB in the beginning and 203.9 MB in the end (delta: 66.1 MB). Free memory was 92.2 MB in the beginning and 172.7 MB in the end (delta: -80.5 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB. [2020-07-21 19:44:38,302 INFO L168 Benchmark]: TraceAbstraction took 31153.47 ms. Allocated memory was 203.9 MB in the beginning and 435.2 MB in the end (delta: 231.2 MB). Free memory was 172.0 MB in the beginning and 336.6 MB in the end (delta: -164.5 MB). Peak memory consumption was 66.7 MB. Max. memory is 7.1 GB. [2020-07-21 19:44:38,308 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.45 ms. Allocated memory is still 137.9 MB. Free memory was 120.9 MB in the beginning and 120.7 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 302.90 ms. Allocated memory is still 137.9 MB. Free memory was 102.8 MB in the beginning and 93.6 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 44.05 ms. Allocated memory is still 137.9 MB. Free memory was 93.6 MB in the beginning and 92.2 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 432.39 ms. Allocated memory was 137.9 MB in the beginning and 203.9 MB in the end (delta: 66.1 MB). Free memory was 92.2 MB in the beginning and 172.7 MB in the end (delta: -80.5 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 31153.47 ms. Allocated memory was 203.9 MB in the beginning and 435.2 MB in the end (delta: 231.2 MB). Free memory was 172.0 MB in the beginning and 336.6 MB in the end (delta: -164.5 MB). Peak memory consumption was 66.7 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 13]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 30.9s, OverallIterations: 12, TraceHistogramMax: 12, AutomataDifference: 2.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 200 SDtfs, 514 SDslu, 1542 SDs, 0 SdLazy, 830 SolverSat, 198 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.8s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1067 GetRequests, 717 SyntacticMatches, 109 SemanticMatches, 241 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1124 ImplicationChecksByTransitivity, 4.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=48occurred in iteration=11, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 12 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 9 PreInvPairs, 9 NumberOfFragments, 19 HoareAnnotationTreeSize, 9 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 24.3s InterpolantComputationTime, 552 NumberOfCodeBlocks, 537 NumberOfCodeBlocksAsserted, 22 NumberOfCheckSat, 990 ConstructedInterpolants, 0 QuantifiedInterpolants, 142320 SizeOfPredicates, 78 NumberOfNonLiveVariables, 1271 ConjunctsInSsa, 203 ConjunctsInUnsatCore, 22 InterpolantComputations, 2 PerfectInterpolantSequences, 1299/2794 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...