/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/heavy-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 17:40:34,675 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 17:40:34,680 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 17:40:34,700 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 17:40:34,700 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 17:40:34,701 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 17:40:34,703 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 17:40:34,705 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 17:40:34,707 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 17:40:34,708 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 17:40:34,710 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 17:40:34,711 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 17:40:34,711 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 17:40:34,712 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 17:40:34,713 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 17:40:34,715 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 17:40:34,716 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 17:40:34,717 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 17:40:34,719 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 17:40:34,722 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 17:40:34,724 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 17:40:34,726 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 17:40:34,728 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 17:40:34,729 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 17:40:34,732 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 17:40:34,747 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 17:40:34,766 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 17:40:34,766 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 17:40:34,769 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 17:40:34,769 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 17:40:34,770 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 17:40:34,770 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 17:40:34,770 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 17:40:34,770 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 17:40:34,771 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 17:40:34,771 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 17:40:34,771 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 17:40:34,771 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 17:40:34,772 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 17:40:34,772 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 17:40:34,772 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 17:40:34,772 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 17:40:34,772 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 17:40:34,773 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 17:40:34,773 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 17:40:34,773 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 17:40:34,773 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 17:40:34,773 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 17:40:34,774 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 17:40:34,774 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 17:40:34,774 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 17:40:34,774 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 17:40:34,775 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:40:34,775 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 17:40:34,775 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 17:40:34,775 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 17:40:35,167 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 17:40:35,183 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 17:40:35,187 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 17:40:35,189 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 17:40:35,190 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 17:40:35,191 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/heavy-2.c [2020-07-20 17:40:35,266 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/63dc94e81/e85fb62fd0f24a7b9932bbe67a914b14/FLAGeb0a65f64 [2020-07-20 17:40:35,831 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 17:40:35,833 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/heavy-2.c [2020-07-20 17:40:35,842 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/63dc94e81/e85fb62fd0f24a7b9932bbe67a914b14/FLAGeb0a65f64 [2020-07-20 17:40:36,179 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/63dc94e81/e85fb62fd0f24a7b9932bbe67a914b14 [2020-07-20 17:40:36,191 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 17:40:36,194 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 17:40:36,195 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 17:40:36,196 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 17:40:36,202 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 17:40:36,204 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:40:36" (1/1) ... [2020-07-20 17:40:36,207 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@46e65e27 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:40:36, skipping insertion in model container [2020-07-20 17:40:36,207 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:40:36" (1/1) ... [2020-07-20 17:40:36,216 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 17:40:36,236 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 17:40:36,481 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:40:36,529 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 17:40:36,552 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:40:36,713 INFO L208 MainTranslator]: Completed translation [2020-07-20 17:40:36,714 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:40:36 WrapperNode [2020-07-20 17:40:36,714 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 17:40:36,715 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 17:40:36,715 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 17:40:36,715 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 17:40:36,728 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:40:36" (1/1) ... [2020-07-20 17:40:36,729 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:40:36" (1/1) ... [2020-07-20 17:40:36,738 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:40:36" (1/1) ... [2020-07-20 17:40:36,739 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:40:36" (1/1) ... [2020-07-20 17:40:36,746 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:40:36" (1/1) ... [2020-07-20 17:40:36,752 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:40:36" (1/1) ... [2020-07-20 17:40:36,754 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:40:36" (1/1) ... [2020-07-20 17:40:36,756 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 17:40:36,757 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 17:40:36,757 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 17:40:36,757 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 17:40:36,759 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:40:36" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 17:40:36,829 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 17:40:36,829 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 17:40:36,830 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 17:40:36,830 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 17:40:36,830 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 17:40:36,830 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-20 17:40:36,831 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-20 17:40:36,831 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 17:40:36,831 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-20 17:40:36,831 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2020-07-20 17:40:36,832 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 17:40:36,832 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-20 17:40:37,112 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 17:40:37,113 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-07-20 17:40:37,118 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:40:37 BoogieIcfgContainer [2020-07-20 17:40:37,119 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 17:40:37,120 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 17:40:37,121 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 17:40:37,124 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 17:40:37,125 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 05:40:36" (1/3) ... [2020-07-20 17:40:37,126 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3cb15cbf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:40:37, skipping insertion in model container [2020-07-20 17:40:37,127 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:40:36" (2/3) ... [2020-07-20 17:40:37,127 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3cb15cbf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:40:37, skipping insertion in model container [2020-07-20 17:40:37,128 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:40:37" (3/3) ... [2020-07-20 17:40:37,131 INFO L109 eAbstractionObserver]: Analyzing ICFG heavy-2.c [2020-07-20 17:40:37,148 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 17:40:37,162 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 17:40:37,187 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 17:40:37,231 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 17:40:37,231 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 17:40:37,231 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 17:40:37,232 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 17:40:37,232 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 17:40:37,232 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 17:40:37,232 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 17:40:37,232 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 17:40:37,259 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2020-07-20 17:40:37,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-07-20 17:40:37,272 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:40:37,273 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:40:37,274 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:40:37,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:40:37,285 INFO L82 PathProgramCache]: Analyzing trace with hash 242978043, now seen corresponding path program 1 times [2020-07-20 17:40:37,295 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:40:37,295 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1877886103] [2020-07-20 17:40:37,296 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:40:37,403 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:40:37,403 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:40:37,407 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-20 17:40:37,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:40:37,433 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:40:37,434 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:40:37,435 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1877886103] [2020-07-20 17:40:37,435 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:40:37,436 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-20 17:40:37,437 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1764334080] [2020-07-20 17:40:37,442 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-20 17:40:37,443 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:40:37,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-20 17:40:37,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 17:40:37,459 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 2 states. [2020-07-20 17:40:37,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:40:37,487 INFO L93 Difference]: Finished difference Result 32 states and 44 transitions. [2020-07-20 17:40:37,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-20 17:40:37,489 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 9 [2020-07-20 17:40:37,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:40:37,501 INFO L225 Difference]: With dead ends: 32 [2020-07-20 17:40:37,501 INFO L226 Difference]: Without dead ends: 15 [2020-07-20 17:40:37,505 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 17:40:37,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-07-20 17:40:37,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-07-20 17:40:37,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-07-20 17:40:37,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-07-20 17:40:37,557 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 9 [2020-07-20 17:40:37,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:40:37,557 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-07-20 17:40:37,557 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-20 17:40:37,558 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-07-20 17:40:37,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-07-20 17:40:37,558 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:40:37,559 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:40:37,774 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:40:37,774 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:40:37,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:40:37,775 INFO L82 PathProgramCache]: Analyzing trace with hash 242949213, now seen corresponding path program 1 times [2020-07-20 17:40:37,775 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:40:37,775 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [202486741] [2020-07-20 17:40:37,776 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:40:37,834 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:40:37,834 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:40:37,835 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:40:37,837 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:40:37,873 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:40:37,873 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:40:37,874 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [202486741] [2020-07-20 17:40:37,874 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:40:37,874 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:40:37,875 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1438878752] [2020-07-20 17:40:37,877 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:40:37,877 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:40:37,877 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:40:37,878 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:40:37,878 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-07-20 17:40:37,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:40:37,933 INFO L93 Difference]: Finished difference Result 24 states and 28 transitions. [2020-07-20 17:40:37,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:40:37,935 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2020-07-20 17:40:37,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:40:37,936 INFO L225 Difference]: With dead ends: 24 [2020-07-20 17:40:37,936 INFO L226 Difference]: Without dead ends: 21 [2020-07-20 17:40:37,939 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:40:37,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-20 17:40:37,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 16. [2020-07-20 17:40:37,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-07-20 17:40:37,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-07-20 17:40:37,952 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 9 [2020-07-20 17:40:37,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:40:37,952 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-07-20 17:40:37,953 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:40:37,954 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-07-20 17:40:37,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-07-20 17:40:37,956 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:40:37,957 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:40:38,173 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:40:38,174 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:40:38,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:40:38,175 INFO L82 PathProgramCache]: Analyzing trace with hash 713101374, now seen corresponding path program 1 times [2020-07-20 17:40:38,176 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:40:38,176 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [994719183] [2020-07-20 17:40:38,177 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:40:38,240 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:40:38,241 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:40:38,242 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:40:38,244 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:40:38,257 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:40:38,258 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:40:38,258 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [994719183] [2020-07-20 17:40:38,258 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:40:38,259 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:40:38,259 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [234253651] [2020-07-20 17:40:38,260 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:40:38,261 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:40:38,262 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:40:38,270 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:40:38,270 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 3 states. [2020-07-20 17:40:38,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:40:38,312 INFO L93 Difference]: Finished difference Result 29 states and 35 transitions. [2020-07-20 17:40:38,314 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:40:38,314 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2020-07-20 17:40:38,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:40:38,315 INFO L225 Difference]: With dead ends: 29 [2020-07-20 17:40:38,315 INFO L226 Difference]: Without dead ends: 20 [2020-07-20 17:40:38,316 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:40:38,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-07-20 17:40:38,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 17. [2020-07-20 17:40:38,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-07-20 17:40:38,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-07-20 17:40:38,322 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2020-07-20 17:40:38,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:40:38,322 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-07-20 17:40:38,323 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:40:38,323 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-07-20 17:40:38,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-20 17:40:38,324 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:40:38,324 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:40:38,538 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:40:38,538 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:40:38,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:40:38,540 INFO L82 PathProgramCache]: Analyzing trace with hash -1111837415, now seen corresponding path program 1 times [2020-07-20 17:40:38,540 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:40:38,541 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2066533326] [2020-07-20 17:40:38,541 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:40:38,593 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:40:38,593 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:40:38,594 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:40:38,596 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:40:38,613 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:40:38,613 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:40:38,614 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2066533326] [2020-07-20 17:40:38,614 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:40:38,614 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:40:38,614 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2001496963] [2020-07-20 17:40:38,615 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:40:38,615 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:40:38,616 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:40:38,616 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:40:38,616 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 3 states. [2020-07-20 17:40:38,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:40:38,654 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-07-20 17:40:38,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:40:38,655 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2020-07-20 17:40:38,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:40:38,656 INFO L225 Difference]: With dead ends: 29 [2020-07-20 17:40:38,656 INFO L226 Difference]: Without dead ends: 19 [2020-07-20 17:40:38,656 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:40:38,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-07-20 17:40:38,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2020-07-20 17:40:38,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-20 17:40:38,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-07-20 17:40:38,661 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 15 [2020-07-20 17:40:38,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:40:38,662 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-07-20 17:40:38,662 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:40:38,662 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-07-20 17:40:38,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-20 17:40:38,663 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:40:38,663 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:40:38,872 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:40:38,874 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:40:38,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:40:38,875 INFO L82 PathProgramCache]: Analyzing trace with hash 1672606071, now seen corresponding path program 1 times [2020-07-20 17:40:38,875 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:40:38,876 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2059434991] [2020-07-20 17:40:38,876 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:40:38,934 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:40:38,934 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:40:38,935 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 17:40:38,937 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:40:38,960 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 17:40:38,963 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:40:39,009 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 17:40:39,010 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2059434991] [2020-07-20 17:40:39,010 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:40:39,011 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-07-20 17:40:39,011 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1169584265] [2020-07-20 17:40:39,011 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 17:40:39,012 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:40:39,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 17:40:39,012 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2020-07-20 17:40:39,013 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 6 states. [2020-07-20 17:40:39,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:40:39,105 INFO L93 Difference]: Finished difference Result 44 states and 54 transitions. [2020-07-20 17:40:39,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 17:40:39,106 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 17 [2020-07-20 17:40:39,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:40:39,107 INFO L225 Difference]: With dead ends: 44 [2020-07-20 17:40:39,107 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 17:40:39,108 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2020-07-20 17:40:39,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 17:40:39,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-07-20 17:40:39,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-20 17:40:39,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 38 transitions. [2020-07-20 17:40:39,117 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 38 transitions. Word has length 17 [2020-07-20 17:40:39,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:40:39,117 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 38 transitions. [2020-07-20 17:40:39,117 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 17:40:39,117 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 38 transitions. [2020-07-20 17:40:39,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-07-20 17:40:39,118 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:40:39,119 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:40:39,332 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:40:39,332 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:40:39,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:40:39,333 INFO L82 PathProgramCache]: Analyzing trace with hash 262979454, now seen corresponding path program 2 times [2020-07-20 17:40:39,333 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:40:39,333 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [220460212] [2020-07-20 17:40:39,334 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:40:39,450 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:40:39,451 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:40:39,453 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 17:40:39,455 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:40:39,480 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 35 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-20 17:40:39,480 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:40:39,513 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 35 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-20 17:40:39,514 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [220460212] [2020-07-20 17:40:39,514 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:40:39,514 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-07-20 17:40:39,514 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [965310280] [2020-07-20 17:40:39,515 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 17:40:39,515 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:40:39,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 17:40:39,516 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2020-07-20 17:40:39,516 INFO L87 Difference]: Start difference. First operand 33 states and 38 transitions. Second operand 6 states. [2020-07-20 17:40:39,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:40:39,631 INFO L93 Difference]: Finished difference Result 83 states and 105 transitions. [2020-07-20 17:40:39,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 17:40:39,631 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 32 [2020-07-20 17:40:39,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:40:39,633 INFO L225 Difference]: With dead ends: 83 [2020-07-20 17:40:39,633 INFO L226 Difference]: Without dead ends: 57 [2020-07-20 17:40:39,634 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2020-07-20 17:40:39,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-20 17:40:39,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-07-20 17:40:39,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-07-20 17:40:39,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 62 transitions. [2020-07-20 17:40:39,646 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 62 transitions. Word has length 32 [2020-07-20 17:40:39,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:40:39,647 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 62 transitions. [2020-07-20 17:40:39,647 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 17:40:39,647 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 62 transitions. [2020-07-20 17:40:39,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-07-20 17:40:39,649 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:40:39,649 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:40:39,862 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:40:39,863 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:40:39,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:40:39,864 INFO L82 PathProgramCache]: Analyzing trace with hash -1418742658, now seen corresponding path program 3 times [2020-07-20 17:40:39,865 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:40:39,865 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [387763784] [2020-07-20 17:40:39,865 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:40:40,333 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:40:40,334 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:40:40,338 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 17:40:40,342 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:40:40,400 INFO L134 CoverageAnalysis]: Checked inductivity of 327 backedges. 128 proven. 16 refuted. 0 times theorem prover too weak. 183 trivial. 0 not checked. [2020-07-20 17:40:40,400 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:40:40,541 INFO L134 CoverageAnalysis]: Checked inductivity of 327 backedges. 128 proven. 16 refuted. 0 times theorem prover too weak. 183 trivial. 0 not checked. [2020-07-20 17:40:40,543 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [387763784] [2020-07-20 17:40:40,544 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:40:40,544 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-20 17:40:40,545 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1547666532] [2020-07-20 17:40:40,545 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 17:40:40,546 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:40:40,546 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 17:40:40,548 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2020-07-20 17:40:40,549 INFO L87 Difference]: Start difference. First operand 57 states and 62 transitions. Second operand 12 states. [2020-07-20 17:40:42,819 WARN L193 SmtUtils]: Spent 2.11 s on a formula simplification. DAG size of input: 26 DAG size of output: 11 [2020-07-20 17:40:45,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:40:45,345 INFO L93 Difference]: Finished difference Result 155 states and 189 transitions. [2020-07-20 17:40:45,348 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 17:40:45,349 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 56 [2020-07-20 17:40:45,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:40:45,352 INFO L225 Difference]: With dead ends: 155 [2020-07-20 17:40:45,353 INFO L226 Difference]: Without dead ends: 105 [2020-07-20 17:40:45,354 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=94, Invalid=146, Unknown=0, NotChecked=0, Total=240 [2020-07-20 17:40:45,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2020-07-20 17:40:45,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 105. [2020-07-20 17:40:45,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-07-20 17:40:45,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 110 transitions. [2020-07-20 17:40:45,379 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 110 transitions. Word has length 56 [2020-07-20 17:40:45,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:40:45,379 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 110 transitions. [2020-07-20 17:40:45,379 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 17:40:45,379 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 110 transitions. [2020-07-20 17:40:45,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2020-07-20 17:40:45,387 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:40:45,387 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:40:45,588 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:40:45,589 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:40:45,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:40:45,590 INFO L82 PathProgramCache]: Analyzing trace with hash -1564350338, now seen corresponding path program 4 times [2020-07-20 17:40:45,590 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:40:45,591 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [805167371] [2020-07-20 17:40:45,591 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in