/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/ldv-regression/test24-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 17:14:58,958 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 17:14:58,961 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 17:14:58,983 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-07-20 17:14:59,010 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 17:14:59,011 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 17:14:59,012 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 17:14:59,013 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 17:14:59,014 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 17:14:59,015 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 17:14:59,017 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 17:14:59,019 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 17:14:59,021 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 17:14:59,022 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 17:14:59,024 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 17:14:59,024 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 17:14:59,027 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 17:14:59,036 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 17:14:59,037 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 17:14:59,037 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 17:14:59,038 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 17:14:59,055 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 17:14:59,055 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 17:14:59,057 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 17:14:59,057 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 17:14:59,057 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 17:14:59,057 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 17:14:59,058 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 17:14:59,058 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 17:14:59,058 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 17:14:59,058 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 17:14:59,058 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 17:14:59,059 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 17:14:59,059 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 17:14:59,059 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 17:14:59,059 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 17:14:59,059 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 17:14:59,060 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 17:14:59,060 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 17:14:59,060 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 17:14:59,060 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 17:14:59,060 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 17:14:59,061 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 17:14:59,061 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 17:14:59,061 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 17:14:59,061 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 17:14:59,062 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 17:14:59,062 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:14:59,062 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 17:14:59,062 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 17:14:59,062 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 17:14:59,380 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 17:14:59,402 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 17:14:59,406 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 17:14:59,408 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 17:14:59,410 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 17:14:59,411 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-regression/test24-2.c [2020-07-20 17:14:59,504 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/135d21b60/99f187c9348e4ae387c442fe19c6b10f/FLAGd0f4475cc [2020-07-20 17:15:00,073 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 17:15:00,074 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/ldv-regression/test24-2.c [2020-07-20 17:15:00,088 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/135d21b60/99f187c9348e4ae387c442fe19c6b10f/FLAGd0f4475cc [2020-07-20 17:15:00,409 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/135d21b60/99f187c9348e4ae387c442fe19c6b10f [2020-07-20 17:15:00,421 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 17:15:00,424 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 17:15:00,425 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 17:15:00,425 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 17:15:00,429 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 17:15:00,430 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:15:00" (1/1) ... [2020-07-20 17:15:00,433 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2a84c9b6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:15:00, skipping insertion in model container [2020-07-20 17:15:00,434 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:15:00" (1/1) ... [2020-07-20 17:15:00,444 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 17:15:00,465 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 17:15:00,670 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:15:00,679 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 17:15:00,698 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:15:00,716 INFO L208 MainTranslator]: Completed translation [2020-07-20 17:15:00,716 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:15:00 WrapperNode [2020-07-20 17:15:00,716 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 17:15:00,717 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 17:15:00,717 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 17:15:00,717 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 17:15:00,838 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:15:00" (1/1) ... [2020-07-20 17:15:00,840 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:15:00" (1/1) ... [2020-07-20 17:15:00,853 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:15:00" (1/1) ... [2020-07-20 17:15:00,854 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:15:00" (1/1) ... [2020-07-20 17:15:00,865 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:15:00" (1/1) ... [2020-07-20 17:15:00,872 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:15:00" (1/1) ... [2020-07-20 17:15:00,873 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:15:00" (1/1) ... [2020-07-20 17:15:00,876 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 17:15:00,877 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 17:15:00,877 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 17:15:00,877 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 17:15:00,879 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:15:00" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 17:15:00,948 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 17:15:00,948 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 17:15:00,948 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2020-07-20 17:15:00,949 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 17:15:00,949 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 17:15:00,949 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 17:15:00,949 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-07-20 17:15:00,949 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-20 17:15:00,949 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 17:15:00,949 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-20 17:15:00,950 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-20 17:15:00,950 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-20 17:15:00,950 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 17:15:00,950 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 17:15:01,306 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 17:15:01,307 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-07-20 17:15:01,312 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:15:01 BoogieIcfgContainer [2020-07-20 17:15:01,312 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 17:15:01,314 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 17:15:01,314 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 17:15:01,319 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 17:15:01,319 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 05:15:00" (1/3) ... [2020-07-20 17:15:01,321 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@469ae708 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:15:01, skipping insertion in model container [2020-07-20 17:15:01,321 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:15:00" (2/3) ... [2020-07-20 17:15:01,322 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@469ae708 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:15:01, skipping insertion in model container [2020-07-20 17:15:01,322 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:15:01" (3/3) ... [2020-07-20 17:15:01,325 INFO L109 eAbstractionObserver]: Analyzing ICFG test24-2.c [2020-07-20 17:15:01,338 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 17:15:01,348 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 17:15:01,364 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 17:15:01,389 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 17:15:01,390 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 17:15:01,390 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 17:15:01,390 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 17:15:01,391 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 17:15:01,391 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 17:15:01,391 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 17:15:01,391 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 17:15:01,411 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-07-20 17:15:01,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-20 17:15:01,417 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:15:01,419 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:15:01,420 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:15:01,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:15:01,427 INFO L82 PathProgramCache]: Analyzing trace with hash 855240046, now seen corresponding path program 1 times [2020-07-20 17:15:01,437 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:15:01,438 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [102216146] [2020-07-20 17:15:01,438 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:15:01,557 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:15:01,558 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:15:01,561 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-20 17:15:01,569 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:15:01,605 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:15:01,608 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:15:01,610 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [102216146] [2020-07-20 17:15:01,611 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:15:01,611 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-20 17:15:01,613 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1185976332] [2020-07-20 17:15:01,621 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-20 17:15:01,622 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:15:01,638 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-20 17:15:01,639 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 17:15:01,641 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 2 states. [2020-07-20 17:15:01,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:15:01,664 INFO L93 Difference]: Finished difference Result 42 states and 50 transitions. [2020-07-20 17:15:01,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-20 17:15:01,666 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2020-07-20 17:15:01,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:15:01,678 INFO L225 Difference]: With dead ends: 42 [2020-07-20 17:15:01,679 INFO L226 Difference]: Without dead ends: 20 [2020-07-20 17:15:01,683 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 17:15:01,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-07-20 17:15:01,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-07-20 17:15:01,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-07-20 17:15:01,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2020-07-20 17:15:01,731 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2020-07-20 17:15:01,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:15:01,733 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2020-07-20 17:15:01,733 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-20 17:15:01,733 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2020-07-20 17:15:01,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-20 17:15:01,734 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:15:01,735 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:15:01,949 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:15:01,950 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:15:01,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:15:01,951 INFO L82 PathProgramCache]: Analyzing trace with hash -1631497781, now seen corresponding path program 1 times [2020-07-20 17:15:01,951 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:15:01,955 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1004615060] [2020-07-20 17:15:01,956 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:15:02,056 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:15:02,057 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:15:02,058 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 17:15:02,066 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:15:02,111 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:15:02,111 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:15:02,112 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1004615060] [2020-07-20 17:15:02,112 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:15:02,112 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:15:02,113 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1376442105] [2020-07-20 17:15:02,116 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:15:02,117 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:15:02,118 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:15:02,118 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:15:02,119 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 3 states. [2020-07-20 17:15:02,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:15:02,153 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2020-07-20 17:15:02,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:15:02,155 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-20 17:15:02,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:15:02,156 INFO L225 Difference]: With dead ends: 34 [2020-07-20 17:15:02,156 INFO L226 Difference]: Without dead ends: 22 [2020-07-20 17:15:02,158 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 [2020-07-20 17:15:02,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-07-20 17:15:02,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-07-20 17:15:02,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 17:15:02,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-07-20 17:15:02,170 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 18 [2020-07-20 17:15:02,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:15:02,171 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-07-20 17:15:02,171 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:15:02,171 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-07-20 17:15:02,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 17:15:02,172 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:15:02,173 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] [2020-07-20 17:15:02,376 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:15:02,377 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:15:02,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:15:02,378 INFO L82 PathProgramCache]: Analyzing trace with hash 1934775405, now seen corresponding path program 1 times [2020-07-20 17:15:02,379 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:15:02,380 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [897454742] [2020-07-20 17:15:02,380 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 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:15:02,459 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:15:02,460 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:15:02,461 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:15:02,464 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:15:02,519 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:15:02,520 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:15:02,584 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:15:02,586 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [897454742] [2020-07-20 17:15:02,587 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:15:02,587 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-07-20 17:15:02,587 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [194037239] [2020-07-20 17:15:02,588 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 17:15:02,589 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:15:02,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 17:15:02,592 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-20 17:15:02,592 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 6 states. [2020-07-20 17:15:02,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:15:02,651 INFO L93 Difference]: Finished difference Result 39 states and 43 transitions. [2020-07-20 17:15:02,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 17:15:02,652 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-07-20 17:15:02,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:15:02,653 INFO L225 Difference]: With dead ends: 39 [2020-07-20 17:15:02,654 INFO L226 Difference]: Without dead ends: 27 [2020-07-20 17:15:02,655 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-20 17:15:02,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-07-20 17:15:02,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-07-20 17:15:02,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-20 17:15:02,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-07-20 17:15:02,665 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 20 [2020-07-20 17:15:02,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:15:02,666 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-07-20 17:15:02,666 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 17:15:02,666 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-07-20 17:15:02,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 17:15:02,667 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:15:02,668 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:15:02,883 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:15:02,883 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:15:02,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:15:02,884 INFO L82 PathProgramCache]: Analyzing trace with hash 1523652947, now seen corresponding path program 2 times [2020-07-20 17:15:02,885 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:15:02,885 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1956944084] [2020-07-20 17:15:02,885 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:15:03,044 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:15:03,045 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:15:03,048 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 17:15:03,051 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:15:03,113 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:15:03,114 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:15:03,254 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:15:03,255 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1956944084] [2020-07-20 17:15:03,255 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:15:03,255 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-20 17:15:03,255 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [608154784] [2020-07-20 17:15:03,256 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 17:15:03,256 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:15:03,257 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 17:15:03,257 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-07-20 17:15:03,258 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 12 states. [2020-07-20 17:15:03,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:15:03,329 INFO L93 Difference]: Finished difference Result 51 states and 58 transitions. [2020-07-20 17:15:03,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 17:15:03,329 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 26 [2020-07-20 17:15:03,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:15:03,331 INFO L225 Difference]: With dead ends: 51 [2020-07-20 17:15:03,331 INFO L226 Difference]: Without dead ends: 39 [2020-07-20 17:15:03,332 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-07-20 17:15:03,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-07-20 17:15:03,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-07-20 17:15:03,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-07-20 17:15:03,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-07-20 17:15:03,340 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 26 [2020-07-20 17:15:03,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:15:03,341 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-07-20 17:15:03,341 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 17:15:03,341 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-07-20 17:15:03,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-07-20 17:15:03,342 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:15:03,343 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:15:03,555 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:15:03,556 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:15:03,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:15:03,557 INFO L82 PathProgramCache]: Analyzing trace with hash 758560159, now seen corresponding path program 3 times [2020-07-20 17:15:03,558 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:15:03,559 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1596193393] [2020-07-20 17:15:03,559 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:15:04,942 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:15:04,942 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:15:04,953 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 17:15:04,958 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:15:05,113 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:15:05,114 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:15:05,391 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:15:05,392 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1596193393] [2020-07-20 17:15:05,392 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:15:05,393 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 22 [2020-07-20 17:15:05,393 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1352054278] [2020-07-20 17:15:05,394 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 17:15:05,394 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:15:05,396 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 17:15:05,398 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2020-07-20 17:15:05,398 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 22 states. [2020-07-20 17:15:05,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:15:05,527 INFO L93 Difference]: Finished difference Result 71 states and 82 transitions. [2020-07-20 17:15:05,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-20 17:15:05,528 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 38 [2020-07-20 17:15:05,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:15:05,530 INFO L225 Difference]: With dead ends: 71 [2020-07-20 17:15:05,530 INFO L226 Difference]: Without dead ends: 59 [2020-07-20 17:15:05,531 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 53 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2020-07-20 17:15:05,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-07-20 17:15:05,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2020-07-20 17:15:05,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-07-20 17:15:05,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2020-07-20 17:15:05,542 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 38 [2020-07-20 17:15:05,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:15:05,543 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2020-07-20 17:15:05,543 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 17:15:05,543 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2020-07-20 17:15:05,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-07-20 17:15:05,545 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:15:05,545 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:15:05,752 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:15:05,754 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:15:05,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:15:05,755 INFO L82 PathProgramCache]: Analyzing trace with hash -2067273869, now seen corresponding path program 4 times [2020-07-20 17:15:05,755 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:15:05,756 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1521856585] [2020-07-20 17:15:05,756 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:19:37,630 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:19:37,631 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-20 17:19:37,631 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 17:19:51,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 17:19:51,959 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 17:19:52,272 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-20 17:19:52,273 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-20 17:19:52,473 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:19:52,526 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 05:19:52 BoogieIcfgContainer [2020-07-20 17:19:52,526 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 17:19:52,529 INFO L168 Benchmark]: Toolchain (without parser) took 292105.82 ms. Allocated memory was 137.4 MB in the beginning and 248.0 MB in the end (delta: 110.6 MB). Free memory was 101.4 MB in the beginning and 216.6 MB in the end (delta: -115.2 MB). Peak memory consumption was 117.3 MB. Max. memory is 7.1 GB. [2020-07-20 17:19:52,530 INFO L168 Benchmark]: CDTParser took 0.46 ms. Allocated memory is still 137.4 MB. Free memory was 119.2 MB in the beginning and 119.0 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. [2020-07-20 17:19:52,531 INFO L168 Benchmark]: CACSL2BoogieTranslator took 292.03 ms. Allocated memory is still 137.4 MB. Free memory was 100.6 MB in the beginning and 90.3 MB in the end (delta: 10.2 MB). Peak memory consumption was 10.2 MB. Max. memory is 7.1 GB. [2020-07-20 17:19:52,532 INFO L168 Benchmark]: Boogie Preprocessor took 159.41 ms. Allocated memory was 137.4 MB in the beginning and 201.9 MB in the end (delta: 64.5 MB). Free memory was 90.3 MB in the beginning and 179.3 MB in the end (delta: -88.9 MB). Peak memory consumption was 13.8 MB. Max. memory is 7.1 GB. [2020-07-20 17:19:52,532 INFO L168 Benchmark]: RCFGBuilder took 435.46 ms. Allocated memory is still 201.9 MB. Free memory was 179.3 MB in the beginning and 163.6 MB in the end (delta: 15.7 MB). Peak memory consumption was 15.7 MB. Max. memory is 7.1 GB. [2020-07-20 17:19:52,533 INFO L168 Benchmark]: TraceAbstraction took 291212.33 ms. Allocated memory was 201.9 MB in the beginning and 248.0 MB in the end (delta: 46.1 MB). Free memory was 163.6 MB in the beginning and 216.6 MB in the end (delta: -53.0 MB). Peak memory consumption was 115.0 MB. Max. memory is 7.1 GB. [2020-07-20 17:19:52,537 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.46 ms. Allocated memory is still 137.4 MB. Free memory was 119.2 MB in the beginning and 119.0 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 292.03 ms. Allocated memory is still 137.4 MB. Free memory was 100.6 MB in the beginning and 90.3 MB in the end (delta: 10.2 MB). Peak memory consumption was 10.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 159.41 ms. Allocated memory was 137.4 MB in the beginning and 201.9 MB in the end (delta: 64.5 MB). Free memory was 90.3 MB in the beginning and 179.3 MB in the end (delta: -88.9 MB). Peak memory consumption was 13.8 MB. Max. memory is 7.1 GB. * RCFGBuilder took 435.46 ms. Allocated memory is still 201.9 MB. Free memory was 179.3 MB in the beginning and 163.6 MB in the end (delta: 15.7 MB). Peak memory consumption was 15.7 MB. Max. memory is 7.1 GB. * TraceAbstraction took 291212.33 ms. Allocated memory was 201.9 MB in the beginning and 248.0 MB in the end (delta: 46.1 MB). Free memory was 163.6 MB in the beginning and 216.6 MB in the end (delta: -53.0 MB). Peak memory consumption was 115.0 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 37]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L15] struct dummy ad1[20], *ad2; [L16] int i, j, *pa; [L17] j=0 VAL [ad1={2:0}, j=0] [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={2:0}, j=1] [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={2:0}, j=2] [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={2:0}, j=3] [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={2:0}, j=4] [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={2:0}, j=5] [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={2:0}, j=6] [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={2:0}, j=7] [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={2:0}, j=8] [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={2:0}, j=9] [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={2:0}, j=10] [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={2:0}, j=11] [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={2:0}, j=12] [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={2:0}, j=13] [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={2:0}, j=14] [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={2:0}, j=15] [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={2:0}, j=16] [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={2:0}, j=17] [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={2:0}, j=18] [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={2:0}, j=19] [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ VAL [ad1={2:0}, j=20] [L17] COND FALSE !(j<20) VAL [ad1={2:0}, j=20] [L21] i = __VERIFIER_nondet_int() [L22] COND TRUE i >= 0 && i < 10 [L23] ad2 = ad1 [L24] ad1[i].a = i [L25] pa = &ad1[i].a [L26] EXPR ad2[i].a [L26] i = ad2[i].a + 10 [L27] EXPR \read(*pa) VAL [\read(*pa)=1, ad1={2:0}, ad2={2:0}, i=11, j=20, pa={2:8}] [L27] COND FALSE !(i < *pa) [L30] CALL, EXPR check(ad1, i) VAL [\old(b)=11, ad1={2:0}] [L10] EXPR ad1[b].a [L10] return ad1[b].a == b; [L30] RET, EXPR check(ad1, i) VAL [ad1={2:0}, ad2={2:0}, check(ad1, i)=0, i=11, j=20, pa={2:8}] [L30] COND TRUE !check(ad1, i) [L37] __VERIFIER_error() VAL [ad1={2:0}, ad2={2:0}, i=11, j=20, pa={2:8}] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 25 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 291.0s, OverallIterations: 6, TraceHistogramMax: 20, AutomataDifference: 0.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 103 SDtfs, 35 SDslu, 153 SDs, 0 SdLazy, 84 SolverSat, 17 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 198 GetRequests, 161 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=59occurred in iteration=5, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 5 MinimizatonAttempts, 1 StatesRemovedByMinimization, 1 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 273.4s SatisfiabilityAnalysisTime, 0.8s InterpolantComputationTime, 177 NumberOfCodeBlocks, 172 NumberOfCodeBlocksAsserted, 22 NumberOfCheckSat, 195 ConstructedInterpolants, 0 QuantifiedInterpolants, 9525 SizeOfPredicates, 4 NumberOfNonLiveVariables, 525 ConjunctsInSsa, 24 ConjunctsInUnsatCore, 8 InterpolantComputations, 2 PerfectInterpolantSequences, 0/234 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 incorrect! Received shutdown request...