/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/eca-rers2012/Problem10_label55.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 17:31:19,563 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 17:31:19,566 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 17:31:19,579 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 17:31:19,579 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 17:31:19,580 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 17:31:19,582 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 17:31:19,583 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 17:31:19,585 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 17:31:19,586 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 17:31:19,587 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 17:31:19,588 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 17:31:19,588 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 17:31:19,589 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 17:31:19,590 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 17:31:19,592 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 17:31:19,592 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 17:31:19,593 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 17:31:19,595 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 17:31:19,597 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 17:31:19,599 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 17:31:19,600 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 17:31:19,601 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 17:31:19,602 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 17:31:19,605 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 17:31:19,615 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 17:31:19,631 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 17:31:19,631 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 17:31:19,632 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 17:31:19,632 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 17:31:19,633 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 17:31:19,633 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 17:31:19,633 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 17:31:19,633 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 17:31:19,633 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 17:31:19,634 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 17:31:19,634 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 17:31:19,634 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 17:31:19,634 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 17:31:19,634 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 17:31:19,635 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 17:31:19,635 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 17:31:19,635 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 17:31:19,635 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 17:31:19,635 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 17:31:19,636 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 17:31:19,636 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 17:31:19,636 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 17:31:19,636 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 17:31:19,636 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 17:31:19,637 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 17:31:19,637 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 17:31:19,637 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:31:19,637 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 17:31:19,637 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 17:31:19,638 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 17:31:19,943 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 17:31:19,967 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 17:31:19,971 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 17:31:19,973 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 17:31:19,976 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 17:31:19,978 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem10_label55.c [2020-07-20 17:31:20,044 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/99575806f/1c011aee85a84769b16f133faf059b50/FLAG83fd136bc [2020-07-20 17:31:20,671 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 17:31:20,672 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/eca-rers2012/Problem10_label55.c [2020-07-20 17:31:20,684 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/99575806f/1c011aee85a84769b16f133faf059b50/FLAG83fd136bc [2020-07-20 17:31:20,941 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/99575806f/1c011aee85a84769b16f133faf059b50 [2020-07-20 17:31:20,950 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 17:31:20,953 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 17:31:20,954 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 17:31:20,954 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 17:31:20,958 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 17:31:20,959 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:31:20" (1/1) ... [2020-07-20 17:31:20,962 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3d18e257 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:31:20, skipping insertion in model container [2020-07-20 17:31:20,962 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:31:20" (1/1) ... [2020-07-20 17:31:20,971 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 17:31:21,022 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 17:31:21,551 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:31:21,563 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 17:31:21,698 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:31:21,715 INFO L208 MainTranslator]: Completed translation [2020-07-20 17:31:21,715 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:31:21 WrapperNode [2020-07-20 17:31:21,715 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 17:31:21,716 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 17:31:21,716 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 17:31:21,717 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 17:31:21,731 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:31:21" (1/1) ... [2020-07-20 17:31:21,731 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:31:21" (1/1) ... [2020-07-20 17:31:21,749 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:31:21" (1/1) ... [2020-07-20 17:31:21,750 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:31:21" (1/1) ... [2020-07-20 17:31:21,787 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:31:21" (1/1) ... [2020-07-20 17:31:21,804 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:31:21" (1/1) ... [2020-07-20 17:31:21,810 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:31:21" (1/1) ... [2020-07-20 17:31:21,819 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 17:31:21,820 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 17:31:21,820 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 17:31:21,820 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 17:31:21,821 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:31:21" (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 17:31:21,905 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 17:31:21,906 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 17:31:21,906 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2020-07-20 17:31:21,906 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 17:31:21,907 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2020-07-20 17:31:21,907 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 17:31:21,908 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 17:31:21,908 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2020-07-20 17:31:21,908 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 17:31:21,909 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 17:31:21,910 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 17:31:23,204 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 17:31:23,204 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 17:31:23,210 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:31:23 BoogieIcfgContainer [2020-07-20 17:31:23,211 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 17:31:23,212 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 17:31:23,212 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 17:31:23,216 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 17:31:23,216 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 05:31:20" (1/3) ... [2020-07-20 17:31:23,217 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@669eb558 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:31:23, skipping insertion in model container [2020-07-20 17:31:23,218 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:31:21" (2/3) ... [2020-07-20 17:31:23,218 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@669eb558 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:31:23, skipping insertion in model container [2020-07-20 17:31:23,219 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:31:23" (3/3) ... [2020-07-20 17:31:23,221 INFO L109 eAbstractionObserver]: Analyzing ICFG Problem10_label55.c [2020-07-20 17:31:23,232 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 17:31:23,241 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 17:31:23,256 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 17:31:23,283 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 17:31:23,283 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 17:31:23,283 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 17:31:23,284 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 17:31:23,284 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 17:31:23,284 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 17:31:23,284 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 17:31:23,284 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 17:31:23,310 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states. [2020-07-20 17:31:23,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-20 17:31:23,317 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:31:23,318 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, 1] [2020-07-20 17:31:23,319 INFO L427 AbstractCegarLoop]: === Iteration 1 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:31:23,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:31:23,326 INFO L82 PathProgramCache]: Analyzing trace with hash -1305395761, now seen corresponding path program 1 times [2020-07-20 17:31:23,335 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:31:23,336 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [169888911] [2020-07-20 17:31:23,336 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 17:31:23,441 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:31:23,441 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:31:23,444 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 17:31:23,450 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:31:23,513 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 17:31:23,513 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:31:23,515 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [169888911] [2020-07-20 17:31:23,515 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:31:23,516 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:31:23,517 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1607551548] [2020-07-20 17:31:23,522 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:31:23,523 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:31:23,537 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:31:23,538 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:31:23,541 INFO L87 Difference]: Start difference. First operand 215 states. Second operand 3 states. [2020-07-20 17:31:24,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:31:24,599 INFO L93 Difference]: Finished difference Result 586 states and 1004 transitions. [2020-07-20 17:31:24,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:31:24,601 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-20 17:31:24,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:31:24,617 INFO L225 Difference]: With dead ends: 586 [2020-07-20 17:31:24,618 INFO L226 Difference]: Without dead ends: 294 [2020-07-20 17:31:24,625 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 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 17:31:24,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 294 states. [2020-07-20 17:31:24,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 294 to 294. [2020-07-20 17:31:24,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 294 states. [2020-07-20 17:31:24,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 294 states to 294 states and 446 transitions. [2020-07-20 17:31:24,709 INFO L78 Accepts]: Start accepts. Automaton has 294 states and 446 transitions. Word has length 24 [2020-07-20 17:31:24,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:31:24,709 INFO L479 AbstractCegarLoop]: Abstraction has 294 states and 446 transitions. [2020-07-20 17:31:24,710 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:31:24,710 INFO L276 IsEmpty]: Start isEmpty. Operand 294 states and 446 transitions. [2020-07-20 17:31:24,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-07-20 17:31:24,714 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:31:24,715 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:31:24,923 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:31:24,924 INFO L427 AbstractCegarLoop]: === Iteration 2 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:31:24,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:31:24,925 INFO L82 PathProgramCache]: Analyzing trace with hash -2120148430, now seen corresponding path program 1 times [2020-07-20 17:31:24,925 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:31:24,926 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1835864363] [2020-07-20 17:31:24,926 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 17:31:25,023 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:31:25,024 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:31:25,025 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 17:31:25,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:31:25,061 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:31:25,061 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:31:25,062 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1835864363] [2020-07-20 17:31:25,062 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:31:25,062 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:31:25,063 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [636685027] [2020-07-20 17:31:25,064 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:31:25,065 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:31:25,065 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:31:25,065 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:31:25,066 INFO L87 Difference]: Start difference. First operand 294 states and 446 transitions. Second operand 3 states. [2020-07-20 17:31:25,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:31:25,835 INFO L93 Difference]: Finished difference Result 868 states and 1337 transitions. [2020-07-20 17:31:25,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:31:25,836 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 94 [2020-07-20 17:31:25,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:31:25,842 INFO L225 Difference]: With dead ends: 868 [2020-07-20 17:31:25,842 INFO L226 Difference]: Without dead ends: 580 [2020-07-20 17:31:25,844 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 92 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 17:31:25,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 580 states. [2020-07-20 17:31:25,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 580 to 437. [2020-07-20 17:31:25,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 437 states. [2020-07-20 17:31:25,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 437 states to 437 states and 648 transitions. [2020-07-20 17:31:25,883 INFO L78 Accepts]: Start accepts. Automaton has 437 states and 648 transitions. Word has length 94 [2020-07-20 17:31:25,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:31:25,884 INFO L479 AbstractCegarLoop]: Abstraction has 437 states and 648 transitions. [2020-07-20 17:31:25,884 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:31:25,885 INFO L276 IsEmpty]: Start isEmpty. Operand 437 states and 648 transitions. [2020-07-20 17:31:25,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2020-07-20 17:31:25,887 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:31:25,887 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:31:26,101 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:31:26,102 INFO L427 AbstractCegarLoop]: === Iteration 3 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:31:26,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:31:26,103 INFO L82 PathProgramCache]: Analyzing trace with hash -892420335, now seen corresponding path program 1 times [2020-07-20 17:31:26,104 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:31:26,105 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2030050318] [2020-07-20 17:31:26,105 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 17:31:26,181 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:31:26,181 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:31:26,182 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 17:31:26,186 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:31:26,218 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:31:26,218 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:31:26,218 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2030050318] [2020-07-20 17:31:26,219 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:31:26,219 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:31:26,219 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1352247984] [2020-07-20 17:31:26,220 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:31:26,220 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:31:26,220 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:31:26,220 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:31:26,221 INFO L87 Difference]: Start difference. First operand 437 states and 648 transitions. Second operand 3 states. [2020-07-20 17:31:26,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:31:26,982 INFO L93 Difference]: Finished difference Result 1154 states and 1744 transitions. [2020-07-20 17:31:26,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:31:26,982 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 101 [2020-07-20 17:31:26,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:31:26,996 INFO L225 Difference]: With dead ends: 1154 [2020-07-20 17:31:26,996 INFO L226 Difference]: Without dead ends: 723 [2020-07-20 17:31:26,999 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 99 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 17:31:27,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 723 states. [2020-07-20 17:31:27,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 723 to 723. [2020-07-20 17:31:27,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 723 states. [2020-07-20 17:31:27,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 723 states to 723 states and 1077 transitions. [2020-07-20 17:31:27,081 INFO L78 Accepts]: Start accepts. Automaton has 723 states and 1077 transitions. Word has length 101 [2020-07-20 17:31:27,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:31:27,083 INFO L479 AbstractCegarLoop]: Abstraction has 723 states and 1077 transitions. [2020-07-20 17:31:27,083 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:31:27,083 INFO L276 IsEmpty]: Start isEmpty. Operand 723 states and 1077 transitions. [2020-07-20 17:31:27,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2020-07-20 17:31:27,087 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:31:27,087 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:31:27,301 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:31:27,302 INFO L427 AbstractCegarLoop]: === Iteration 4 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:31:27,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:31:27,303 INFO L82 PathProgramCache]: Analyzing trace with hash -1569128931, now seen corresponding path program 1 times [2020-07-20 17:31:27,303 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:31:27,304 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [279320301] [2020-07-20 17:31:27,304 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