/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic BIGGEST_EQUIVALENCE_CLASS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/locks/test_locks_7.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 22:35:44,424 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 22:35:44,427 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 22:35:44,445 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 22:35:44,445 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 22:35:44,447 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 22:35:44,449 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 22:35:44,462 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 22:35:44,464 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 22:35:44,466 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 22:35:44,468 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 22:35:44,469 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 22:35:44,469 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 22:35:44,472 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 22:35:44,475 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 22:35:44,476 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 22:35:44,478 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 22:35:44,479 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 22:35:44,481 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 22:35:44,486 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 22:35:44,490 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 22:35:44,491 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 22:35:44,492 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 22:35:44,493 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 22:35:44,496 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 22:35:44,509 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 22:35:44,510 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 22:35:44,512 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 22:35:44,512 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 22:35:44,531 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 22:35:44,531 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 22:35:44,533 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 22:35:44,533 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 22:35:44,533 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 22:35:44,533 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 22:35:44,534 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 22:35:44,534 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 22:35:44,534 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 22:35:44,534 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 22:35:44,535 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 22:35:44,535 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 22:35:44,536 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 22:35:44,536 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 22:35:44,536 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 22:35:44,536 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 22:35:44,537 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 22:35:44,537 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 22:35:44,537 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 22:35:44,537 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 22:35:44,537 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 22:35:44,538 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 22:35:44,538 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 22:35:44,538 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 22:35:44,538 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 22:35:44,538 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 22:35:44,539 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:44,539 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 22:35:44,539 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 22:35:44,539 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> BIGGEST_EQUIVALENCE_CLASS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-21 22:35:44,806 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 22:35:44,824 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 22:35:44,827 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 22:35:44,829 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 22:35:44,830 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 22:35:44,830 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/locks/test_locks_7.c [2020-07-21 22:35:44,898 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/514806728/d04f42b32a114bbeb9e1efc837e265af/FLAGd6cfd0e8a [2020-07-21 22:35:45,340 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 22:35:45,341 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/locks/test_locks_7.c [2020-07-21 22:35:45,353 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/514806728/d04f42b32a114bbeb9e1efc837e265af/FLAGd6cfd0e8a [2020-07-21 22:35:45,712 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/514806728/d04f42b32a114bbeb9e1efc837e265af [2020-07-21 22:35:45,721 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 22:35:45,725 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 22:35:45,726 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 22:35:45,726 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 22:35:45,729 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 22:35:45,730 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:35:45" (1/1) ... [2020-07-21 22:35:45,733 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@748a131b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:35:45, skipping insertion in model container [2020-07-21 22:35:45,734 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:35:45" (1/1) ... [2020-07-21 22:35:45,741 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 22:35:45,769 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 22:35:45,965 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 22:35:45,972 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 22:35:45,994 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 22:35:46,006 INFO L208 MainTranslator]: Completed translation [2020-07-21 22:35:46,007 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:35:46 WrapperNode [2020-07-21 22:35:46,007 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 22:35:46,008 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 22:35:46,008 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 22:35:46,008 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 22:35:46,017 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:35:46" (1/1) ... [2020-07-21 22:35:46,018 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:35:46" (1/1) ... [2020-07-21 22:35:46,100 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:35:46" (1/1) ... [2020-07-21 22:35:46,101 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:35:46" (1/1) ... [2020-07-21 22:35:46,105 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:35:46" (1/1) ... [2020-07-21 22:35:46,112 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:35:46" (1/1) ... [2020-07-21 22:35:46,113 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:35:46" (1/1) ... [2020-07-21 22:35:46,115 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 22:35:46,115 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 22:35:46,115 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 22:35:46,116 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 22:35:46,116 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:35:46" (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 22:35:46,174 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 22:35:46,174 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 22:35:46,175 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 22:35:46,175 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 22:35:46,175 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 22:35:46,175 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 22:35:46,175 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 22:35:46,175 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 22:35:46,415 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 22:35:46,416 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 22:35:46,420 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:35:46 BoogieIcfgContainer [2020-07-21 22:35:46,420 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 22:35:46,422 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 22:35:46,422 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 22:35:46,430 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 22:35:46,430 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 10:35:45" (1/3) ... [2020-07-21 22:35:46,431 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@95eb66 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:35:46, skipping insertion in model container [2020-07-21 22:35:46,431 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:35:46" (2/3) ... [2020-07-21 22:35:46,432 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@95eb66 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:35:46, skipping insertion in model container [2020-07-21 22:35:46,432 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:35:46" (3/3) ... [2020-07-21 22:35:46,434 INFO L109 eAbstractionObserver]: Analyzing ICFG test_locks_7.c [2020-07-21 22:35:46,445 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 22:35:46,453 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 22:35:46,469 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 22:35:46,508 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 22:35:46,508 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 22:35:46,508 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 22:35:46,508 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 22:35:46,509 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 22:35:46,509 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 22:35:46,509 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 22:35:46,509 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 22:35:46,546 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states. [2020-07-21 22:35:46,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-21 22:35:46,555 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:46,556 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:35:46,557 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:46,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:46,563 INFO L82 PathProgramCache]: Analyzing trace with hash 1819770524, now seen corresponding path program 1 times [2020-07-21 22:35:46,572 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:46,572 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [982687520] [2020-07-21 22:35:46,573 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:46,665 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:46,665 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:46,668 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:46,674 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:46,717 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 22:35:46,717 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:46,718 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [982687520] [2020-07-21 22:35:46,719 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:46,719 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:46,720 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [106912509] [2020-07-21 22:35:46,724 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:46,725 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:46,738 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:46,739 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:46,741 INFO L87 Difference]: Start difference. First operand 35 states. Second operand 3 states. [2020-07-21 22:35:46,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:46,793 INFO L93 Difference]: Finished difference Result 69 states and 114 transitions. [2020-07-21 22:35:46,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:46,795 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-07-21 22:35:46,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:46,807 INFO L225 Difference]: With dead ends: 69 [2020-07-21 22:35:46,808 INFO L226 Difference]: Without dead ends: 54 [2020-07-21 22:35:46,811 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:46,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-07-21 22:35:46,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 38. [2020-07-21 22:35:46,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-07-21 22:35:46,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 65 transitions. [2020-07-21 22:35:46,857 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 65 transitions. Word has length 17 [2020-07-21 22:35:46,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:46,857 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 65 transitions. [2020-07-21 22:35:46,858 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:46,858 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 65 transitions. [2020-07-21 22:35:46,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-21 22:35:46,860 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:46,861 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:35:47,061 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:47,062 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:47,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:47,063 INFO L82 PathProgramCache]: Analyzing trace with hash 1426743514, now seen corresponding path program 1 times [2020-07-21 22:35:47,064 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:47,065 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1758210768] [2020-07-21 22:35:47,065 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:47,142 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:35:47,142 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:47,146 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:47,148 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:47,167 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 22:35:47,168 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:47,170 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1758210768] [2020-07-21 22:35:47,170 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:47,171 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:47,171 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1743736763] [2020-07-21 22:35:47,173 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:47,173 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:47,176 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:47,176 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:47,177 INFO L87 Difference]: Start difference. First operand 38 states and 65 transitions. Second operand 3 states. [2020-07-21 22:35:47,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:47,225 INFO L93 Difference]: Finished difference Result 87 states and 152 transitions. [2020-07-21 22:35:47,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:47,228 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-07-21 22:35:47,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:47,231 INFO L225 Difference]: With dead ends: 87 [2020-07-21 22:35:47,231 INFO L226 Difference]: Without dead ends: 54 [2020-07-21 22:35:47,234 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:47,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-07-21 22:35:47,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 52. [2020-07-21 22:35:47,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-07-21 22:35:47,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 89 transitions. [2020-07-21 22:35:47,253 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 89 transitions. Word has length 17 [2020-07-21 22:35:47,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:47,253 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 89 transitions. [2020-07-21 22:35:47,254 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:47,254 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 89 transitions. [2020-07-21 22:35:47,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-21 22:35:47,257 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:47,257 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:35:47,473 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:47,474 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:47,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:47,475 INFO L82 PathProgramCache]: Analyzing trace with hash 578525748, now seen corresponding path program 1 times [2020-07-21 22:35:47,475 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:47,476 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1195652930] [2020-07-21 22:35:47,476 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:47,521 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:35:47,521 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:47,522 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:47,524 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:47,538 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 22:35:47,539 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:47,539 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1195652930] [2020-07-21 22:35:47,539 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:47,539 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:47,540 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [449720674] [2020-07-21 22:35:47,540 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:47,540 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:47,541 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:47,541 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:47,541 INFO L87 Difference]: Start difference. First operand 52 states and 89 transitions. Second operand 3 states. [2020-07-21 22:35:47,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:47,585 INFO L93 Difference]: Finished difference Result 81 states and 135 transitions. [2020-07-21 22:35:47,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:47,587 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-21 22:35:47,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:47,588 INFO L225 Difference]: With dead ends: 81 [2020-07-21 22:35:47,589 INFO L226 Difference]: Without dead ends: 57 [2020-07-21 22:35:47,592 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:47,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-21 22:35:47,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 55. [2020-07-21 22:35:47,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-21 22:35:47,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 91 transitions. [2020-07-21 22:35:47,607 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 91 transitions. Word has length 18 [2020-07-21 22:35:47,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:47,608 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 91 transitions. [2020-07-21 22:35:47,608 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:47,609 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 91 transitions. [2020-07-21 22:35:47,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-21 22:35:47,610 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:47,610 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:35:47,811 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:47,815 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:47,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:47,815 INFO L82 PathProgramCache]: Analyzing trace with hash 1279590326, now seen corresponding path program 1 times [2020-07-21 22:35:47,815 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:47,815 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [257614030] [2020-07-21 22:35:47,816 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:47,862 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:47,862 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:47,863 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:47,865 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:47,880 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 22:35:47,880 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:47,884 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [257614030] [2020-07-21 22:35:47,884 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:47,884 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:47,885 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [586664397] [2020-07-21 22:35:47,885 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:47,886 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:47,886 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:47,886 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:47,886 INFO L87 Difference]: Start difference. First operand 55 states and 91 transitions. Second operand 3 states. [2020-07-21 22:35:47,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:47,910 INFO L93 Difference]: Finished difference Result 100 states and 168 transitions. [2020-07-21 22:35:47,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:47,910 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-21 22:35:47,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:47,912 INFO L225 Difference]: With dead ends: 100 [2020-07-21 22:35:47,912 INFO L226 Difference]: Without dead ends: 98 [2020-07-21 22:35:47,913 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:47,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-21 22:35:47,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 72. [2020-07-21 22:35:47,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-07-21 22:35:47,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 120 transitions. [2020-07-21 22:35:47,923 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 120 transitions. Word has length 18 [2020-07-21 22:35:47,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:47,923 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 120 transitions. [2020-07-21 22:35:47,923 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:47,923 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 120 transitions. [2020-07-21 22:35:47,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-21 22:35:47,925 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:47,925 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:35:48,128 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:48,129 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:48,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:48,130 INFO L82 PathProgramCache]: Analyzing trace with hash 886563316, now seen corresponding path program 1 times [2020-07-21 22:35:48,131 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:48,132 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [715872717] [2020-07-21 22:35:48,132 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:48,172 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:48,173 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:48,174 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:48,175 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:48,185 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 22:35:48,185 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:48,186 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [715872717] [2020-07-21 22:35:48,186 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:48,186 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:48,186 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1925964862] [2020-07-21 22:35:48,187 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:48,187 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:48,187 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:48,188 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:48,188 INFO L87 Difference]: Start difference. First operand 72 states and 120 transitions. Second operand 3 states. [2020-07-21 22:35:48,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:48,223 INFO L93 Difference]: Finished difference Result 164 states and 278 transitions. [2020-07-21 22:35:48,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:48,224 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-21 22:35:48,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:48,226 INFO L225 Difference]: With dead ends: 164 [2020-07-21 22:35:48,226 INFO L226 Difference]: Without dead ends: 100 [2020-07-21 22:35:48,227 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:48,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-07-21 22:35:48,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 98. [2020-07-21 22:35:48,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2020-07-21 22:35:48,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 162 transitions. [2020-07-21 22:35:48,237 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 162 transitions. Word has length 18 [2020-07-21 22:35:48,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:48,238 INFO L479 AbstractCegarLoop]: Abstraction has 98 states and 162 transitions. [2020-07-21 22:35:48,238 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:48,238 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 162 transitions. [2020-07-21 22:35:48,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 22:35:48,239 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:48,239 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:35:48,445 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:48,446 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:48,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:48,447 INFO L82 PathProgramCache]: Analyzing trace with hash 1012809135, now seen corresponding path program 1 times [2020-07-21 22:35:48,447 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:48,448 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1307029409] [2020-07-21 22:35:48,448 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:48,481 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:48,481 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:48,482 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:48,483 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:48,496 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 22:35:48,497 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:48,497 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1307029409] [2020-07-21 22:35:48,498 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:48,498 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:48,498 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1609913461] [2020-07-21 22:35:48,499 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:48,499 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:48,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:48,499 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:48,500 INFO L87 Difference]: Start difference. First operand 98 states and 162 transitions. Second operand 3 states. [2020-07-21 22:35:48,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:48,530 INFO L93 Difference]: Finished difference Result 147 states and 241 transitions. [2020-07-21 22:35:48,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:48,531 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-21 22:35:48,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:48,537 INFO L225 Difference]: With dead ends: 147 [2020-07-21 22:35:48,538 INFO L226 Difference]: Without dead ends: 102 [2020-07-21 22:35:48,539 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:48,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-07-21 22:35:48,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 100. [2020-07-21 22:35:48,552 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2020-07-21 22:35:48,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 162 transitions. [2020-07-21 22:35:48,553 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 162 transitions. Word has length 19 [2020-07-21 22:35:48,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:48,554 INFO L479 AbstractCegarLoop]: Abstraction has 100 states and 162 transitions. [2020-07-21 22:35:48,554 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:48,554 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 162 transitions. [2020-07-21 22:35:48,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 22:35:48,560 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:48,560 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:35:48,761 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:48,762 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:48,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:48,762 INFO L82 PathProgramCache]: Analyzing trace with hash 1713873713, now seen corresponding path program 1 times [2020-07-21 22:35:48,763 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:48,764 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [668175089] [2020-07-21 22:35:48,764 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:48,794 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:48,794 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:48,795 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:48,796 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:48,810 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 22:35:48,810 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:48,810 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [668175089] [2020-07-21 22:35:48,811 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:48,811 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:48,811 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [767846535] [2020-07-21 22:35:48,812 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:48,812 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:48,812 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:48,813 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:48,813 INFO L87 Difference]: Start difference. First operand 100 states and 162 transitions. Second operand 3 states. [2020-07-21 22:35:48,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:48,833 INFO L93 Difference]: Finished difference Result 180 states and 296 transitions. [2020-07-21 22:35:48,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:48,834 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-21 22:35:48,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:48,835 INFO L225 Difference]: With dead ends: 180 [2020-07-21 22:35:48,835 INFO L226 Difference]: Without dead ends: 178 [2020-07-21 22:35:48,836 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:48,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2020-07-21 22:35:48,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 136. [2020-07-21 22:35:48,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2020-07-21 22:35:48,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 218 transitions. [2020-07-21 22:35:48,856 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 218 transitions. Word has length 19 [2020-07-21 22:35:48,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:48,856 INFO L479 AbstractCegarLoop]: Abstraction has 136 states and 218 transitions. [2020-07-21 22:35:48,856 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:48,856 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 218 transitions. [2020-07-21 22:35:48,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 22:35:48,858 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:48,858 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:35:49,068 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:49,069 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:49,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:49,070 INFO L82 PathProgramCache]: Analyzing trace with hash 1320846703, now seen corresponding path program 1 times [2020-07-21 22:35:49,070 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:49,071 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [932850983] [2020-07-21 22:35:49,071 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:49,102 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:49,103 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:49,103 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:49,105 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:49,113 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 22:35:49,114 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:49,114 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [932850983] [2020-07-21 22:35:49,114 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:49,115 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:49,115 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1782991765] [2020-07-21 22:35:49,115 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:49,115 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:49,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:49,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:49,116 INFO L87 Difference]: Start difference. First operand 136 states and 218 transitions. Second operand 3 states. [2020-07-21 22:35:49,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:49,145 INFO L93 Difference]: Finished difference Result 312 states and 504 transitions. [2020-07-21 22:35:49,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:49,145 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-21 22:35:49,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:49,147 INFO L225 Difference]: With dead ends: 312 [2020-07-21 22:35:49,147 INFO L226 Difference]: Without dead ends: 186 [2020-07-21 22:35:49,149 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:49,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2020-07-21 22:35:49,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 184. [2020-07-21 22:35:49,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2020-07-21 22:35:49,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 290 transitions. [2020-07-21 22:35:49,160 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 290 transitions. Word has length 19 [2020-07-21 22:35:49,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:49,161 INFO L479 AbstractCegarLoop]: Abstraction has 184 states and 290 transitions. [2020-07-21 22:35:49,161 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:49,161 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 290 transitions. [2020-07-21 22:35:49,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 22:35:49,163 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:49,163 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:35:49,375 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:49,376 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:49,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:49,377 INFO L82 PathProgramCache]: Analyzing trace with hash 1590692585, now seen corresponding path program 1 times [2020-07-21 22:35:49,378 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:49,378 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [325000466] [2020-07-21 22:35:49,379 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:49,412 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:49,412 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:49,415 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:49,416 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:49,431 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 22:35:49,432 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:49,432 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [325000466] [2020-07-21 22:35:49,432 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:49,433 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:49,433 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1890238304] [2020-07-21 22:35:49,433 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:49,433 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:49,434 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:49,434 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:49,434 INFO L87 Difference]: Start difference. First operand 184 states and 290 transitions. Second operand 3 states. [2020-07-21 22:35:49,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:49,456 INFO L93 Difference]: Finished difference Result 276 states and 432 transitions. [2020-07-21 22:35:49,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:49,457 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-21 22:35:49,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:49,458 INFO L225 Difference]: With dead ends: 276 [2020-07-21 22:35:49,458 INFO L226 Difference]: Without dead ends: 190 [2020-07-21 22:35:49,460 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:49,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2020-07-21 22:35:49,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 188. [2020-07-21 22:35:49,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 188 states. [2020-07-21 22:35:49,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 290 transitions. [2020-07-21 22:35:49,471 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 290 transitions. Word has length 20 [2020-07-21 22:35:49,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:49,471 INFO L479 AbstractCegarLoop]: Abstraction has 188 states and 290 transitions. [2020-07-21 22:35:49,471 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:49,471 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 290 transitions. [2020-07-21 22:35:49,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 22:35:49,473 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:49,473 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:35:49,679 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:49,681 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:49,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:49,682 INFO L82 PathProgramCache]: Analyzing trace with hash -2003210133, now seen corresponding path program 1 times [2020-07-21 22:35:49,682 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:49,683 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [499995912] [2020-07-21 22:35:49,683 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:49,716 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:49,716 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:49,716 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:49,718 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:49,733 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 22:35:49,733 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:49,733 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [499995912] [2020-07-21 22:35:49,734 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:49,734 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:49,734 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1614865924] [2020-07-21 22:35:49,734 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:49,735 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:49,735 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:49,735 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:49,735 INFO L87 Difference]: Start difference. First operand 188 states and 290 transitions. Second operand 3 states. [2020-07-21 22:35:49,758 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:49,759 INFO L93 Difference]: Finished difference Result 332 states and 520 transitions. [2020-07-21 22:35:49,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:49,764 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-21 22:35:49,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:49,767 INFO L225 Difference]: With dead ends: 332 [2020-07-21 22:35:49,767 INFO L226 Difference]: Without dead ends: 330 [2020-07-21 22:35:49,767 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:49,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 330 states. [2020-07-21 22:35:49,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 330 to 264. [2020-07-21 22:35:49,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 264 states. [2020-07-21 22:35:49,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 264 states to 264 states and 398 transitions. [2020-07-21 22:35:49,778 INFO L78 Accepts]: Start accepts. Automaton has 264 states and 398 transitions. Word has length 20 [2020-07-21 22:35:49,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:49,778 INFO L479 AbstractCegarLoop]: Abstraction has 264 states and 398 transitions. [2020-07-21 22:35:49,778 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:49,779 INFO L276 IsEmpty]: Start isEmpty. Operand 264 states and 398 transitions. [2020-07-21 22:35:49,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 22:35:49,781 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:49,781 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:35:49,995 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:49,996 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:49,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:49,997 INFO L82 PathProgramCache]: Analyzing trace with hash 1898730153, now seen corresponding path program 1 times [2020-07-21 22:35:49,997 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:49,998 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1112050240] [2020-07-21 22:35:49,998 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:50,025 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:50,026 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:50,026 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:50,027 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:50,037 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 22:35:50,037 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:50,038 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1112050240] [2020-07-21 22:35:50,038 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:50,038 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:50,038 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1846076898] [2020-07-21 22:35:50,039 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:50,039 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:50,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:50,040 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:50,040 INFO L87 Difference]: Start difference. First operand 264 states and 398 transitions. Second operand 3 states. [2020-07-21 22:35:50,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:50,066 INFO L93 Difference]: Finished difference Result 604 states and 912 transitions. [2020-07-21 22:35:50,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:50,066 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-21 22:35:50,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:50,068 INFO L225 Difference]: With dead ends: 604 [2020-07-21 22:35:50,068 INFO L226 Difference]: Without dead ends: 354 [2020-07-21 22:35:50,070 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:50,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 354 states. [2020-07-21 22:35:50,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 354 to 352. [2020-07-21 22:35:50,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 352 states. [2020-07-21 22:35:50,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 352 states to 352 states and 518 transitions. [2020-07-21 22:35:50,084 INFO L78 Accepts]: Start accepts. Automaton has 352 states and 518 transitions. Word has length 20 [2020-07-21 22:35:50,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:50,084 INFO L479 AbstractCegarLoop]: Abstraction has 352 states and 518 transitions. [2020-07-21 22:35:50,084 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:50,085 INFO L276 IsEmpty]: Start isEmpty. Operand 352 states and 518 transitions. [2020-07-21 22:35:50,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 22:35:50,086 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:50,086 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:35:50,299 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:50,300 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:50,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:50,301 INFO L82 PathProgramCache]: Analyzing trace with hash -1969756604, now seen corresponding path program 1 times [2020-07-21 22:35:50,302 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:50,302 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1018683526] [2020-07-21 22:35:50,303 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:50,337 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:35:50,337 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:50,339 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:50,350 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:50,361 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 22:35:50,362 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:50,362 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1018683526] [2020-07-21 22:35:50,363 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:50,363 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:50,363 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1767909455] [2020-07-21 22:35:50,364 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:50,364 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:50,364 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:50,365 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:50,365 INFO L87 Difference]: Start difference. First operand 352 states and 518 transitions. Second operand 3 states. [2020-07-21 22:35:50,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:50,391 INFO L93 Difference]: Finished difference Result 528 states and 772 transitions. [2020-07-21 22:35:50,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:50,392 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 22:35:50,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:50,395 INFO L225 Difference]: With dead ends: 528 [2020-07-21 22:35:50,395 INFO L226 Difference]: Without dead ends: 362 [2020-07-21 22:35:50,397 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:50,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 362 states. [2020-07-21 22:35:50,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 362 to 360. [2020-07-21 22:35:50,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 360 states. [2020-07-21 22:35:50,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 360 states to 360 states and 518 transitions. [2020-07-21 22:35:50,419 INFO L78 Accepts]: Start accepts. Automaton has 360 states and 518 transitions. Word has length 21 [2020-07-21 22:35:50,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:50,422 INFO L479 AbstractCegarLoop]: Abstraction has 360 states and 518 transitions. [2020-07-21 22:35:50,422 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:50,422 INFO L276 IsEmpty]: Start isEmpty. Operand 360 states and 518 transitions. [2020-07-21 22:35:50,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 22:35:50,425 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:50,425 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:35:50,632 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:50,633 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:50,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:50,634 INFO L82 PathProgramCache]: Analyzing trace with hash -1268692026, now seen corresponding path program 1 times [2020-07-21 22:35:50,634 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:50,635 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [77609518] [2020-07-21 22:35:50,635 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:50,669 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:50,670 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:50,671 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:50,672 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:50,684 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 22:35:50,684 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:50,684 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [77609518] [2020-07-21 22:35:50,685 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:50,685 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:50,685 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [541013926] [2020-07-21 22:35:50,685 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:50,686 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:50,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:50,686 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:50,686 INFO L87 Difference]: Start difference. First operand 360 states and 518 transitions. Second operand 3 states. [2020-07-21 22:35:50,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:50,729 INFO L93 Difference]: Finished difference Result 620 states and 904 transitions. [2020-07-21 22:35:50,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:50,730 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 22:35:50,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:50,733 INFO L225 Difference]: With dead ends: 620 [2020-07-21 22:35:50,733 INFO L226 Difference]: Without dead ends: 618 [2020-07-21 22:35:50,734 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:50,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 618 states. [2020-07-21 22:35:50,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 618 to 520. [2020-07-21 22:35:50,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 520 states. [2020-07-21 22:35:50,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 520 states to 520 states and 726 transitions. [2020-07-21 22:35:50,767 INFO L78 Accepts]: Start accepts. Automaton has 520 states and 726 transitions. Word has length 21 [2020-07-21 22:35:50,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:50,768 INFO L479 AbstractCegarLoop]: Abstraction has 520 states and 726 transitions. [2020-07-21 22:35:50,768 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:50,768 INFO L276 IsEmpty]: Start isEmpty. Operand 520 states and 726 transitions. [2020-07-21 22:35:50,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 22:35:50,770 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:50,770 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:35:50,983 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:50,984 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:50,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:50,985 INFO L82 PathProgramCache]: Analyzing trace with hash -1661719036, now seen corresponding path program 1 times [2020-07-21 22:35:50,985 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:50,985 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2093196992] [2020-07-21 22:35:50,986 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:51,047 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:51,048 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:51,050 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:51,057 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:51,081 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 22:35:51,081 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:51,082 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2093196992] [2020-07-21 22:35:51,083 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:51,083 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:51,083 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2079058294] [2020-07-21 22:35:51,084 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:51,084 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:51,084 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:51,085 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:51,085 INFO L87 Difference]: Start difference. First operand 520 states and 726 transitions. Second operand 3 states. [2020-07-21 22:35:51,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:51,123 INFO L93 Difference]: Finished difference Result 1180 states and 1640 transitions. [2020-07-21 22:35:51,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:51,124 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 22:35:51,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:51,129 INFO L225 Difference]: With dead ends: 1180 [2020-07-21 22:35:51,130 INFO L226 Difference]: Without dead ends: 682 [2020-07-21 22:35:51,132 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:51,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 682 states. [2020-07-21 22:35:51,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 682 to 680. [2020-07-21 22:35:51,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 680 states. [2020-07-21 22:35:51,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 680 states to 680 states and 918 transitions. [2020-07-21 22:35:51,158 INFO L78 Accepts]: Start accepts. Automaton has 680 states and 918 transitions. Word has length 21 [2020-07-21 22:35:51,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:51,159 INFO L479 AbstractCegarLoop]: Abstraction has 680 states and 918 transitions. [2020-07-21 22:35:51,159 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:51,159 INFO L276 IsEmpty]: Start isEmpty. Operand 680 states and 918 transitions. [2020-07-21 22:35:51,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 22:35:51,161 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:51,162 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:35:51,377 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:51,378 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:51,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:51,379 INFO L82 PathProgramCache]: Analyzing trace with hash -674531426, now seen corresponding path program 1 times [2020-07-21 22:35:51,379 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:51,379 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2115180980] [2020-07-21 22:35:51,380 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:51,426 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:51,426 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:51,427 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:51,428 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:51,440 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 22:35:51,441 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:51,441 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2115180980] [2020-07-21 22:35:51,441 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:51,442 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:51,442 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2087783349] [2020-07-21 22:35:51,442 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:51,443 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:51,443 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:51,443 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:51,443 INFO L87 Difference]: Start difference. First operand 680 states and 918 transitions. Second operand 3 states. [2020-07-21 22:35:51,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:51,470 INFO L93 Difference]: Finished difference Result 1020 states and 1368 transitions. [2020-07-21 22:35:51,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:51,471 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 22:35:51,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:51,475 INFO L225 Difference]: With dead ends: 1020 [2020-07-21 22:35:51,475 INFO L226 Difference]: Without dead ends: 698 [2020-07-21 22:35:51,478 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:51,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 698 states. [2020-07-21 22:35:51,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 698 to 696. [2020-07-21 22:35:51,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 696 states. [2020-07-21 22:35:51,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 696 states to 696 states and 918 transitions. [2020-07-21 22:35:51,505 INFO L78 Accepts]: Start accepts. Automaton has 696 states and 918 transitions. Word has length 22 [2020-07-21 22:35:51,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:51,505 INFO L479 AbstractCegarLoop]: Abstraction has 696 states and 918 transitions. [2020-07-21 22:35:51,505 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:51,506 INFO L276 IsEmpty]: Start isEmpty. Operand 696 states and 918 transitions. [2020-07-21 22:35:51,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 22:35:51,507 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:51,507 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:35:51,720 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:51,721 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:51,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:51,721 INFO L82 PathProgramCache]: Analyzing trace with hash 26533152, now seen corresponding path program 1 times [2020-07-21 22:35:51,721 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:51,722 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [205131672] [2020-07-21 22:35:51,722 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:51,753 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:51,754 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:51,754 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:51,755 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:51,762 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 22:35:51,763 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:51,763 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [205131672] [2020-07-21 22:35:51,766 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:51,766 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:51,767 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1018667196] [2020-07-21 22:35:51,767 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:51,767 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:51,767 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:51,767 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:51,768 INFO L87 Difference]: Start difference. First operand 696 states and 918 transitions. Second operand 3 states. [2020-07-21 22:35:51,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:51,800 INFO L93 Difference]: Finished difference Result 1164 states and 1544 transitions. [2020-07-21 22:35:51,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:51,801 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 22:35:51,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:51,806 INFO L225 Difference]: With dead ends: 1164 [2020-07-21 22:35:51,806 INFO L226 Difference]: Without dead ends: 1162 [2020-07-21 22:35:51,807 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:51,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1162 states. [2020-07-21 22:35:51,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1162 to 1032. [2020-07-21 22:35:51,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1032 states. [2020-07-21 22:35:51,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1032 states to 1032 states and 1318 transitions. [2020-07-21 22:35:51,841 INFO L78 Accepts]: Start accepts. Automaton has 1032 states and 1318 transitions. Word has length 22 [2020-07-21 22:35:51,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:51,841 INFO L479 AbstractCegarLoop]: Abstraction has 1032 states and 1318 transitions. [2020-07-21 22:35:51,842 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:51,842 INFO L276 IsEmpty]: Start isEmpty. Operand 1032 states and 1318 transitions. [2020-07-21 22:35:51,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 22:35:51,844 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:51,844 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:35:52,058 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:52,059 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:52,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:52,060 INFO L82 PathProgramCache]: Analyzing trace with hash -366493858, now seen corresponding path program 1 times [2020-07-21 22:35:52,060 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:52,060 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1412582319] [2020-07-21 22:35:52,061 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:52,088 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:52,088 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:52,089 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:52,090 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:52,098 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 22:35:52,099 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:52,099 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1412582319] [2020-07-21 22:35:52,099 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:52,099 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:52,099 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1729865249] [2020-07-21 22:35:52,100 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:52,100 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:52,100 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:52,100 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:52,100 INFO L87 Difference]: Start difference. First operand 1032 states and 1318 transitions. Second operand 3 states. [2020-07-21 22:35:52,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:52,140 INFO L93 Difference]: Finished difference Result 2316 states and 2920 transitions. [2020-07-21 22:35:52,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:52,141 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 22:35:52,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:52,147 INFO L225 Difference]: With dead ends: 2316 [2020-07-21 22:35:52,147 INFO L226 Difference]: Without dead ends: 1322 [2020-07-21 22:35:52,150 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:52,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1322 states. [2020-07-21 22:35:52,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1322 to 1320. [2020-07-21 22:35:52,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1320 states. [2020-07-21 22:35:52,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1320 states to 1320 states and 1606 transitions. [2020-07-21 22:35:52,203 INFO L78 Accepts]: Start accepts. Automaton has 1320 states and 1606 transitions. Word has length 22 [2020-07-21 22:35:52,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:52,203 INFO L479 AbstractCegarLoop]: Abstraction has 1320 states and 1606 transitions. [2020-07-21 22:35:52,203 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:52,203 INFO L276 IsEmpty]: Start isEmpty. Operand 1320 states and 1606 transitions. [2020-07-21 22:35:52,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 22:35:52,206 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:52,206 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:35:52,419 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:52,420 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:52,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:52,421 INFO L82 PathProgramCache]: Analyzing trace with hash 822743769, now seen corresponding path program 1 times [2020-07-21 22:35:52,421 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:52,421 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [807177097] [2020-07-21 22:35:52,421 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:52,456 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:52,456 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:52,457 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:52,458 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:52,465 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 22:35:52,465 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:52,465 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [807177097] [2020-07-21 22:35:52,466 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:52,466 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:52,466 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1238444940] [2020-07-21 22:35:52,468 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:52,468 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:52,469 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:52,469 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:52,469 INFO L87 Difference]: Start difference. First operand 1320 states and 1606 transitions. Second operand 3 states. [2020-07-21 22:35:52,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:52,512 INFO L93 Difference]: Finished difference Result 1980 states and 2392 transitions. [2020-07-21 22:35:52,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:52,513 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 22:35:52,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:52,519 INFO L225 Difference]: With dead ends: 1980 [2020-07-21 22:35:52,519 INFO L226 Difference]: Without dead ends: 1354 [2020-07-21 22:35:52,520 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:52,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1354 states. [2020-07-21 22:35:52,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1354 to 1352. [2020-07-21 22:35:52,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1352 states. [2020-07-21 22:35:52,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1352 states to 1352 states and 1606 transitions. [2020-07-21 22:35:52,560 INFO L78 Accepts]: Start accepts. Automaton has 1352 states and 1606 transitions. Word has length 23 [2020-07-21 22:35:52,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:52,560 INFO L479 AbstractCegarLoop]: Abstraction has 1352 states and 1606 transitions. [2020-07-21 22:35:52,561 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:52,561 INFO L276 IsEmpty]: Start isEmpty. Operand 1352 states and 1606 transitions. [2020-07-21 22:35:52,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 22:35:52,563 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:52,563 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:35:52,776 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:52,777 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:52,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:52,778 INFO L82 PathProgramCache]: Analyzing trace with hash 1523808347, now seen corresponding path program 1 times [2020-07-21 22:35:52,778 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:52,779 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1126362862] [2020-07-21 22:35:52,779 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:52,814 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:52,815 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:52,815 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:52,816 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:52,830 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 22:35:52,831 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:52,831 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1126362862] [2020-07-21 22:35:52,831 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:52,831 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:52,832 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [572662573] [2020-07-21 22:35:52,832 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:52,832 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:52,832 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:52,832 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:52,833 INFO L87 Difference]: Start difference. First operand 1352 states and 1606 transitions. Second operand 3 states. [2020-07-21 22:35:52,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:52,876 INFO L93 Difference]: Finished difference Result 2186 states and 2567 transitions. [2020-07-21 22:35:52,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:52,876 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 22:35:52,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:52,885 INFO L225 Difference]: With dead ends: 2186 [2020-07-21 22:35:52,886 INFO L226 Difference]: Without dead ends: 2184 [2020-07-21 22:35:52,887 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:52,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2184 states. [2020-07-21 22:35:52,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2184 to 2056. [2020-07-21 22:35:52,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2056 states. [2020-07-21 22:35:52,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2056 states to 2056 states and 2374 transitions. [2020-07-21 22:35:52,940 INFO L78 Accepts]: Start accepts. Automaton has 2056 states and 2374 transitions. Word has length 23 [2020-07-21 22:35:52,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:52,940 INFO L479 AbstractCegarLoop]: Abstraction has 2056 states and 2374 transitions. [2020-07-21 22:35:52,941 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:52,941 INFO L276 IsEmpty]: Start isEmpty. Operand 2056 states and 2374 transitions. [2020-07-21 22:35:52,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 22:35:52,944 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:35:52,944 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:35:53,159 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:53,160 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:35:53,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:35:53,160 INFO L82 PathProgramCache]: Analyzing trace with hash 1130781337, now seen corresponding path program 1 times [2020-07-21 22:35:53,160 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:35:53,160 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1658785028] [2020-07-21 22:35:53,161 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:53,187 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:35:53,187 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:35:53,188 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:35:53,189 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:35:53,197 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 22:35:53,197 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:35:53,200 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1658785028] [2020-07-21 22:35:53,200 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:35:53,201 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:35:53,201 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1421542413] [2020-07-21 22:35:53,201 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:35:53,201 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:35:53,202 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:35:53,202 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:53,202 INFO L87 Difference]: Start difference. First operand 2056 states and 2374 transitions. Second operand 3 states. [2020-07-21 22:35:53,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:35:53,268 INFO L93 Difference]: Finished difference Result 4552 states and 5126 transitions. [2020-07-21 22:35:53,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:35:53,269 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 22:35:53,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:35:53,269 INFO L225 Difference]: With dead ends: 4552 [2020-07-21 22:35:53,269 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 22:35:53,277 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:35:53,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 22:35:53,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 22:35:53,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 22:35:53,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 22:35:53,278 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 23 [2020-07-21 22:35:53,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:35:53,279 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 22:35:53,279 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:35:53,279 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 22:35:53,279 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 22:35:53,492 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:35:53,495 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 22:35:53,547 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 22:35:53,547 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 22:35:53,547 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 22:35:53,547 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 22:35:53,548 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 22:35:53,548 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 22:35:53,548 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 4 121) no Hoare annotation was computed. [2020-07-21 22:35:53,548 INFO L268 CegarLoopResult]: For program point L102(line 102) no Hoare annotation was computed. [2020-07-21 22:35:53,548 INFO L268 CegarLoopResult]: For program point L86-1(lines 30 116) no Hoare annotation was computed. [2020-07-21 22:35:53,548 INFO L271 CegarLoopResult]: At program point L111-1(lines 30 116) the Hoare annotation is: true [2020-07-21 22:35:53,548 INFO L268 CegarLoopResult]: For program point L87(line 87) no Hoare annotation was computed. [2020-07-21 22:35:53,548 INFO L268 CegarLoopResult]: For program point L112(line 112) no Hoare annotation was computed. [2020-07-21 22:35:53,549 INFO L264 CegarLoopResult]: At program point L112-1(lines 5 121) the Hoare annotation is: false [2020-07-21 22:35:53,549 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 4 121) no Hoare annotation was computed. [2020-07-21 22:35:53,549 INFO L268 CegarLoopResult]: For program point L71-1(lines 30 116) no Hoare annotation was computed. [2020-07-21 22:35:53,549 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 119) no Hoare annotation was computed. [2020-07-21 22:35:53,549 INFO L268 CegarLoopResult]: For program point L96-1(lines 30 116) no Hoare annotation was computed. [2020-07-21 22:35:53,549 INFO L268 CegarLoopResult]: For program point L63-1(lines 30 116) no Hoare annotation was computed. [2020-07-21 22:35:53,549 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 4 121) the Hoare annotation is: true [2020-07-21 22:35:53,549 INFO L268 CegarLoopResult]: For program point L55-1(lines 30 116) no Hoare annotation was computed. [2020-07-21 22:35:53,550 INFO L268 CegarLoopResult]: For program point L97(line 97) no Hoare annotation was computed. [2020-07-21 22:35:53,550 INFO L268 CegarLoopResult]: For program point L81-1(lines 30 116) no Hoare annotation was computed. [2020-07-21 22:35:53,550 INFO L268 CegarLoopResult]: For program point L106-1(lines 30 116) no Hoare annotation was computed. [2020-07-21 22:35:53,550 INFO L268 CegarLoopResult]: For program point L32(lines 32 34) no Hoare annotation was computed. [2020-07-21 22:35:53,550 INFO L268 CegarLoopResult]: For program point L82(line 82) no Hoare annotation was computed. [2020-07-21 22:35:53,551 INFO L268 CegarLoopResult]: For program point L107(line 107) no Hoare annotation was computed. [2020-07-21 22:35:53,551 INFO L268 CegarLoopResult]: For program point L91-1(lines 30 116) no Hoare annotation was computed. [2020-07-21 22:35:53,551 INFO L268 CegarLoopResult]: For program point L75-1(lines 30 116) no Hoare annotation was computed. [2020-07-21 22:35:53,551 INFO L268 CegarLoopResult]: For program point L67-1(lines 30 116) no Hoare annotation was computed. [2020-07-21 22:35:53,552 INFO L268 CegarLoopResult]: For program point L92(line 92) no Hoare annotation was computed. [2020-07-21 22:35:53,552 INFO L268 CegarLoopResult]: For program point L59-1(lines 30 116) no Hoare annotation was computed. [2020-07-21 22:35:53,552 INFO L271 CegarLoopResult]: At program point L117(lines 5 121) the Hoare annotation is: true [2020-07-21 22:35:53,552 INFO L268 CegarLoopResult]: For program point L51(lines 51 53) no Hoare annotation was computed. [2020-07-21 22:35:53,552 INFO L268 CegarLoopResult]: For program point L51-2(lines 30 116) no Hoare annotation was computed. [2020-07-21 22:35:53,552 INFO L268 CegarLoopResult]: For program point L101-1(lines 30 116) no Hoare annotation was computed. [2020-07-21 22:35:53,564 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 10:35:53 BoogieIcfgContainer [2020-07-21 22:35:53,564 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 22:35:53,567 INFO L168 Benchmark]: Toolchain (without parser) took 7843.29 ms. Allocated memory was 146.3 MB in the beginning and 244.8 MB in the end (delta: 98.6 MB). Free memory was 103.2 MB in the beginning and 117.7 MB in the end (delta: -14.5 MB). Peak memory consumption was 84.1 MB. Max. memory is 7.1 GB. [2020-07-21 22:35:53,567 INFO L168 Benchmark]: CDTParser took 0.45 ms. Allocated memory is still 146.3 MB. Free memory was 121.2 MB in the beginning and 121.0 MB in the end (delta: 209.9 kB). Peak memory consumption was 209.9 kB. Max. memory is 7.1 GB. [2020-07-21 22:35:53,569 INFO L168 Benchmark]: CACSL2BoogieTranslator took 281.81 ms. Allocated memory is still 146.3 MB. Free memory was 102.8 MB in the beginning and 92.7 MB in the end (delta: 10.1 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. [2020-07-21 22:35:53,574 INFO L168 Benchmark]: Boogie Preprocessor took 107.12 ms. Allocated memory was 146.3 MB in the beginning and 203.4 MB in the end (delta: 57.1 MB). Free memory was 92.7 MB in the beginning and 181.6 MB in the end (delta: -88.9 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. [2020-07-21 22:35:53,575 INFO L168 Benchmark]: RCFGBuilder took 305.02 ms. Allocated memory is still 203.4 MB. Free memory was 181.6 MB in the beginning and 165.1 MB in the end (delta: 16.5 MB). Peak memory consumption was 16.5 MB. Max. memory is 7.1 GB. [2020-07-21 22:35:53,575 INFO L168 Benchmark]: TraceAbstraction took 7142.64 ms. Allocated memory was 203.4 MB in the beginning and 244.8 MB in the end (delta: 41.4 MB). Free memory was 165.1 MB in the beginning and 117.7 MB in the end (delta: 47.4 MB). Peak memory consumption was 88.8 MB. Max. memory is 7.1 GB. [2020-07-21 22:35:53,585 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 146.3 MB. Free memory was 121.2 MB in the beginning and 121.0 MB in the end (delta: 209.9 kB). Peak memory consumption was 209.9 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 281.81 ms. Allocated memory is still 146.3 MB. Free memory was 102.8 MB in the beginning and 92.7 MB in the end (delta: 10.1 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 107.12 ms. Allocated memory was 146.3 MB in the beginning and 203.4 MB in the end (delta: 57.1 MB). Free memory was 92.7 MB in the beginning and 181.6 MB in the end (delta: -88.9 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 305.02 ms. Allocated memory is still 203.4 MB. Free memory was 181.6 MB in the beginning and 165.1 MB in the end (delta: 16.5 MB). Peak memory consumption was 16.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 7142.64 ms. Allocated memory was 203.4 MB in the beginning and 244.8 MB in the end (delta: 41.4 MB). Free memory was 165.1 MB in the beginning and 117.7 MB in the end (delta: 47.4 MB). Peak memory consumption was 88.8 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 119]: 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 - InvariantResult [Line: 30]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 5]: Loop Invariant Derived loop invariant: 0 - InvariantResult [Line: 5]: Loop Invariant Derived loop invariant: 1 - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 35 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 6.9s, OverallIterations: 20, TraceHistogramMax: 1, AutomataDifference: 0.8s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 1238 SDtfs, 574 SDslu, 829 SDs, 0 SdLazy, 107 SolverSat, 20 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 383 GetRequests, 363 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=2056occurred in iteration=19, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.4s AutomataMinimizationTime, 20 MinimizatonAttempts, 530 StatesRemovedByMinimization, 19 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 7 PreInvPairs, 138 NumberOfFragments, 7 HoareAnnotationTreeSize, 7 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 0.3s InterpolantComputationTime, 403 NumberOfCodeBlocks, 395 NumberOfCodeBlocksAsserted, 77 NumberOfCheckSat, 383 ConstructedInterpolants, 0 QuantifiedInterpolants, 13856 SizeOfPredicates, 0 NumberOfNonLiveVariables, 1674 ConjunctsInSsa, 60 ConjunctsInUnsatCore, 20 InterpolantComputations, 20 PerfectInterpolantSequences, 0/0 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...