/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/id2_b3_o2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 19:43:43,093 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 19:43:43,097 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 19:43:43,124 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 19:43:43,125 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 19:43:43,127 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 19:43:43,129 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 19:43:43,132 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 19:43:43,135 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 19:43:43,137 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 19:43:43,138 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 19:43:43,140 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 19:43:43,141 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 19:43:43,143 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 19:43:43,145 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 19:43:43,147 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 19:43:43,148 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 19:43:43,150 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 19:43:43,153 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 19:43:43,156 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 19:43:43,160 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 19:43:43,162 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 19:43:43,164 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 19:43:43,166 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 19:43:43,170 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 19:43:43,183 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 19:43:43,185 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 19:43:43,186 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 19:43:43,187 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 19:43:43,208 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 19:43:43,208 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 19:43:43,211 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 19:43:43,211 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 19:43:43,211 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 19:43:43,212 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 19:43:43,212 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 19:43:43,212 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 19:43:43,212 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 19:43:43,213 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 19:43:43,213 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 19:43:43,213 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 19:43:43,213 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 19:43:43,213 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 19:43:43,214 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 19:43:43,214 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 19:43:43,214 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 19:43:43,214 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 19:43:43,215 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 19:43:43,215 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 19:43:43,215 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 19:43:43,215 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 19:43:43,216 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 19:43:43,216 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 19:43:43,216 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 19:43:43,216 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 19:43:43,216 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:43,217 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 19:43:43,217 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 19:43:43,217 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> DAGSIZE Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 19:43:43,624 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 19:43:43,662 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 19:43:43,669 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 19:43:43,672 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 19:43:43,672 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 19:43:43,674 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id2_b3_o2.c [2020-07-21 19:43:43,799 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7d89f1718/e594efc8d45c4ca1ab46b8ad2d210e00/FLAGb351037a8 [2020-07-21 19:43:44,663 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 19:43:44,666 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id2_b3_o2.c [2020-07-21 19:43:44,674 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7d89f1718/e594efc8d45c4ca1ab46b8ad2d210e00/FLAGb351037a8 [2020-07-21 19:43:44,701 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7d89f1718/e594efc8d45c4ca1ab46b8ad2d210e00 [2020-07-21 19:43:44,714 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 19:43:44,718 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 19:43:44,720 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 19:43:44,720 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 19:43:44,726 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 19:43:44,728 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 07:43:44" (1/1) ... [2020-07-21 19:43:44,733 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2e2313e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:44, skipping insertion in model container [2020-07-21 19:43:44,734 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 07:43:44" (1/1) ... [2020-07-21 19:43:44,746 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 19:43:44,774 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 19:43:45,053 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 19:43:45,062 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 19:43:45,089 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 19:43:45,117 INFO L208 MainTranslator]: Completed translation [2020-07-21 19:43:45,118 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:45 WrapperNode [2020-07-21 19:43:45,118 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 19:43:45,120 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 19:43:45,121 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 19:43:45,121 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 19:43:45,146 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:45" (1/1) ... [2020-07-21 19:43:45,147 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:45" (1/1) ... [2020-07-21 19:43:45,155 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:45" (1/1) ... [2020-07-21 19:43:45,156 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:45" (1/1) ... [2020-07-21 19:43:45,286 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:45" (1/1) ... [2020-07-21 19:43:45,292 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:45" (1/1) ... [2020-07-21 19:43:45,293 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:45" (1/1) ... [2020-07-21 19:43:45,303 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 19:43:45,304 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 19:43:45,307 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 19:43:45,308 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 19:43:45,310 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:45" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 19:43:45,410 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 19:43:45,411 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 19:43:45,411 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-07-21 19:43:45,411 INFO L138 BoogieDeclarations]: Found implementation of procedure id2 [2020-07-21 19:43:45,411 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 19:43:45,412 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-21 19:43:45,412 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 19:43:45,412 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-07-21 19:43:45,412 INFO L130 BoogieDeclarations]: Found specification of procedure id2 [2020-07-21 19:43:45,413 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 19:43:45,413 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 19:43:45,413 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 19:43:45,728 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 19:43:45,729 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 19:43:45,738 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 07:43:45 BoogieIcfgContainer [2020-07-21 19:43:45,739 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 19:43:45,741 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 19:43:45,741 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 19:43:45,747 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 19:43:45,747 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 07:43:44" (1/3) ... [2020-07-21 19:43:45,748 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@503e79a6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 07:43:45, skipping insertion in model container [2020-07-21 19:43:45,748 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:45" (2/3) ... [2020-07-21 19:43:45,749 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@503e79a6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 07:43:45, skipping insertion in model container [2020-07-21 19:43:45,749 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 07:43:45" (3/3) ... [2020-07-21 19:43:45,752 INFO L109 eAbstractionObserver]: Analyzing ICFG id2_b3_o2.c [2020-07-21 19:43:45,792 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 19:43:45,830 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 19:43:45,870 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 19:43:45,915 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 19:43:45,915 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 19:43:45,915 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 19:43:45,915 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 19:43:45,916 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 19:43:45,916 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 19:43:45,916 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 19:43:45,916 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 19:43:45,948 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states. [2020-07-21 19:43:45,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 19:43:45,960 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:45,963 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:45,964 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:45,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:45,972 INFO L82 PathProgramCache]: Analyzing trace with hash 128923731, now seen corresponding path program 1 times [2020-07-21 19:43:45,984 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:45,985 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [604688216] [2020-07-21 19:43:45,986 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:46,103 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:43:46,104 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:46,108 INFO L263 TraceCheckSpWp]: Trace formula consists of 20 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 19:43:46,117 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:46,245 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:43:46,246 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:43:46,248 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [604688216] [2020-07-21 19:43:46,249 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:43:46,249 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 19:43:46,252 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1006008555] [2020-07-21 19:43:46,262 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 19:43:46,263 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:46,285 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 19:43:46,287 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 19:43:46,291 INFO L87 Difference]: Start difference. First operand 28 states. Second operand 5 states. [2020-07-21 19:43:46,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:46,393 INFO L93 Difference]: Finished difference Result 40 states and 46 transitions. [2020-07-21 19:43:46,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 19:43:46,396 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 19:43:46,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:46,418 INFO L225 Difference]: With dead ends: 40 [2020-07-21 19:43:46,418 INFO L226 Difference]: Without dead ends: 26 [2020-07-21 19:43:46,424 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 19:43:46,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-07-21 19:43:46,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-07-21 19:43:46,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 19:43:46,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2020-07-21 19:43:46,508 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 13 [2020-07-21 19:43:46,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:46,509 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2020-07-21 19:43:46,510 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 19:43:46,510 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2020-07-21 19:43:46,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 19:43:46,514 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:46,514 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:46,730 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:46,731 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:46,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:46,733 INFO L82 PathProgramCache]: Analyzing trace with hash 1945633833, now seen corresponding path program 1 times [2020-07-21 19:43:46,734 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:46,735 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [66663779] [2020-07-21 19:43:46,735 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:46,782 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:46,783 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:46,785 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 19:43:46,789 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:46,835 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:43:46,836 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:43:46,837 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [66663779] [2020-07-21 19:43:46,837 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:43:46,837 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 19:43:46,838 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1113905209] [2020-07-21 19:43:46,841 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 19:43:46,842 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:46,842 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 19:43:46,843 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 19:43:46,843 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand 5 states. [2020-07-21 19:43:46,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:46,897 INFO L93 Difference]: Finished difference Result 44 states and 52 transitions. [2020-07-21 19:43:46,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 19:43:46,898 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2020-07-21 19:43:46,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:46,900 INFO L225 Difference]: With dead ends: 44 [2020-07-21 19:43:46,900 INFO L226 Difference]: Without dead ends: 32 [2020-07-21 19:43:46,903 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 19:43:46,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-21 19:43:46,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-21 19:43:46,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 19:43:46,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2020-07-21 19:43:46,915 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 20 [2020-07-21 19:43:46,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:46,916 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2020-07-21 19:43:46,917 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 19:43:46,917 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2020-07-21 19:43:46,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 19:43:46,918 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:46,919 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:47,134 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:47,135 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:47,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:47,137 INFO L82 PathProgramCache]: Analyzing trace with hash 1974262984, now seen corresponding path program 1 times [2020-07-21 19:43:47,137 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:47,138 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1701080223] [2020-07-21 19:43:47,138 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:47,219 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:47,221 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:47,225 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 19:43:47,228 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:47,360 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:43:47,360 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:43:47,361 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1701080223] [2020-07-21 19:43:47,362 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:43:47,362 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-21 19:43:47,362 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1172240410] [2020-07-21 19:43:47,363 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 19:43:47,364 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:47,364 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 19:43:47,365 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-07-21 19:43:47,365 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand 8 states. [2020-07-21 19:43:47,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:47,460 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2020-07-21 19:43:47,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 19:43:47,462 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 20 [2020-07-21 19:43:47,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:47,464 INFO L225 Difference]: With dead ends: 36 [2020-07-21 19:43:47,464 INFO L226 Difference]: Without dead ends: 32 [2020-07-21 19:43:47,465 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-07-21 19:43:47,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-21 19:43:47,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-21 19:43:47,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 19:43:47,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2020-07-21 19:43:47,476 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 20 [2020-07-21 19:43:47,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:47,477 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2020-07-21 19:43:47,477 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 19:43:47,477 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2020-07-21 19:43:47,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 19:43:47,478 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:47,479 INFO L422 BasicCegarLoop]: trace histogram [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] [2020-07-21 19:43:47,695 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:47,698 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:47,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:47,699 INFO L82 PathProgramCache]: Analyzing trace with hash 1423155149, now seen corresponding path program 1 times [2020-07-21 19:43:47,699 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:47,700 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [259248290] [2020-07-21 19:43:47,700 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:47,797 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:47,797 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:47,799 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 19:43:47,802 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:47,846 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 19:43:47,847 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:43:47,848 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [259248290] [2020-07-21 19:43:47,848 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:43:47,848 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 19:43:47,849 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [268687510] [2020-07-21 19:43:47,850 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 19:43:47,850 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:47,851 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 19:43:47,851 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 19:43:47,851 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand 5 states. [2020-07-21 19:43:47,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:47,895 INFO L93 Difference]: Finished difference Result 48 states and 55 transitions. [2020-07-21 19:43:47,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 19:43:47,896 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 27 [2020-07-21 19:43:47,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:47,898 INFO L225 Difference]: With dead ends: 48 [2020-07-21 19:43:47,898 INFO L226 Difference]: Without dead ends: 36 [2020-07-21 19:43:47,899 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 19:43:47,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-21 19:43:47,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 34. [2020-07-21 19:43:47,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-07-21 19:43:47,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 38 transitions. [2020-07-21 19:43:47,909 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 38 transitions. Word has length 27 [2020-07-21 19:43:47,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:47,910 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 38 transitions. [2020-07-21 19:43:47,910 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 19:43:47,911 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 38 transitions. [2020-07-21 19:43:47,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 19:43:47,912 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:47,913 INFO L422 BasicCegarLoop]: trace histogram [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] [2020-07-21 19:43:48,116 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:48,117 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:48,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:48,118 INFO L82 PathProgramCache]: Analyzing trace with hash 1226641644, now seen corresponding path program 1 times [2020-07-21 19:43:48,119 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:48,120 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1127550070] [2020-07-21 19:43:48,120 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:48,165 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:48,165 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:48,167 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 19:43:48,170 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:48,256 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 19:43:48,257 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:43:48,257 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1127550070] [2020-07-21 19:43:48,258 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:43:48,277 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-21 19:43:48,278 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [660365335] [2020-07-21 19:43:48,279 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 19:43:48,280 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:48,280 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 19:43:48,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-07-21 19:43:48,281 INFO L87 Difference]: Start difference. First operand 34 states and 38 transitions. Second operand 8 states. [2020-07-21 19:43:48,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:48,398 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2020-07-21 19:43:48,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 19:43:48,401 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 27 [2020-07-21 19:43:48,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:48,403 INFO L225 Difference]: With dead ends: 52 [2020-07-21 19:43:48,404 INFO L226 Difference]: Without dead ends: 40 [2020-07-21 19:43:48,406 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-07-21 19:43:48,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-07-21 19:43:48,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 38. [2020-07-21 19:43:48,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-07-21 19:43:48,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 42 transitions. [2020-07-21 19:43:48,432 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 42 transitions. Word has length 27 [2020-07-21 19:43:48,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:48,433 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 42 transitions. [2020-07-21 19:43:48,433 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 19:43:48,433 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 42 transitions. [2020-07-21 19:43:48,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 19:43:48,439 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:48,439 INFO L422 BasicCegarLoop]: trace histogram [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] [2020-07-21 19:43:48,653 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:48,654 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:48,655 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:48,655 INFO L82 PathProgramCache]: Analyzing trace with hash 1255270795, now seen corresponding path program 1 times [2020-07-21 19:43:48,656 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:48,656 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [360716990] [2020-07-21 19:43:48,657 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:48,695 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:48,695 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-21 19:43:48,696 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 19:43:48,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 19:43:48,717 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 19:43:48,793 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 19:43:48,793 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 19:43:49,010 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:49,073 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 07:43:49 BoogieIcfgContainer [2020-07-21 19:43:49,073 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 19:43:49,085 INFO L168 Benchmark]: Toolchain (without parser) took 4359.44 ms. Allocated memory was 139.5 MB in the beginning and 233.3 MB in the end (delta: 93.8 MB). Free memory was 100.4 MB in the beginning and 187.7 MB in the end (delta: -87.4 MB). Peak memory consumption was 6.5 MB. Max. memory is 7.1 GB. [2020-07-21 19:43:49,087 INFO L168 Benchmark]: CDTParser took 1.50 ms. Allocated memory is still 139.5 MB. Free memory was 119.0 MB in the beginning and 118.8 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-07-21 19:43:49,090 INFO L168 Benchmark]: CACSL2BoogieTranslator took 399.72 ms. Allocated memory is still 139.5 MB. Free memory was 100.2 MB in the beginning and 90.5 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. [2020-07-21 19:43:49,092 INFO L168 Benchmark]: Boogie Preprocessor took 182.75 ms. Allocated memory was 139.5 MB in the beginning and 202.9 MB in the end (delta: 63.4 MB). Free memory was 90.5 MB in the beginning and 181.6 MB in the end (delta: -91.1 MB). Peak memory consumption was 12.3 MB. Max. memory is 7.1 GB. [2020-07-21 19:43:49,094 INFO L168 Benchmark]: RCFGBuilder took 435.01 ms. Allocated memory is still 202.9 MB. Free memory was 181.6 MB in the beginning and 169.0 MB in the end (delta: 12.7 MB). Peak memory consumption was 12.7 MB. Max. memory is 7.1 GB. [2020-07-21 19:43:49,108 INFO L168 Benchmark]: TraceAbstraction took 3332.46 ms. Allocated memory was 202.9 MB in the beginning and 233.3 MB in the end (delta: 30.4 MB). Free memory was 169.0 MB in the beginning and 187.7 MB in the end (delta: -18.8 MB). Peak memory consumption was 11.6 MB. Max. memory is 7.1 GB. [2020-07-21 19:43:49,120 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 1.50 ms. Allocated memory is still 139.5 MB. Free memory was 119.0 MB in the beginning and 118.8 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 399.72 ms. Allocated memory is still 139.5 MB. Free memory was 100.2 MB in the beginning and 90.5 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 182.75 ms. Allocated memory was 139.5 MB in the beginning and 202.9 MB in the end (delta: 63.4 MB). Free memory was 90.5 MB in the beginning and 181.6 MB in the end (delta: -91.1 MB). Peak memory consumption was 12.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 435.01 ms. Allocated memory is still 202.9 MB. Free memory was 181.6 MB in the beginning and 169.0 MB in the end (delta: 12.7 MB). Peak memory consumption was 12.7 MB. Max. memory is 7.1 GB. * TraceAbstraction took 3332.46 ms. Allocated memory was 202.9 MB in the beginning and 233.3 MB in the end (delta: 30.4 MB). Free memory was 169.0 MB in the beginning and 187.7 MB in the end (delta: -18.8 MB). Peak memory consumption was 11.6 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 25]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L22] unsigned int input = __VERIFIER_nondet_uint(); [L23] CALL, EXPR id(input) VAL [\old(x)=2] [L8] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L9] CALL, EXPR id2(x-1) VAL [\old(x)=1] [L15] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L16] CALL, EXPR id(x-1) VAL [\old(x)=0] [L8] COND TRUE x==0 [L8] return 0; VAL [\old(x)=0, \result=0, x=0] [L16] RET, EXPR id(x-1) VAL [\old(x)=1, id(x-1)=0, x=1] [L16] unsigned int ret = id(x-1) + 1; [L17] COND FALSE !(ret > 3) [L18] return ret; VAL [\old(x)=1, \result=1, ret=1, x=1] [L9] RET, EXPR id2(x-1) VAL [\old(x)=2, id2(x-1)=1, x=2] [L9] unsigned int ret = id2(x-1) + 1; [L10] COND FALSE !(ret > 3) [L11] return ret; VAL [\old(x)=2, \result=2, ret=2, x=2] [L23] RET, EXPR id(input) VAL [id(input)=2, input=2] [L23] unsigned int result = id(input); [L24] COND TRUE result == 2 VAL [input=2, result=2] [L25] __VERIFIER_error() VAL [input=2, result=2] - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 28 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 3.1s, OverallIterations: 6, TraceHistogramMax: 2, AutomataDifference: 0.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 143 SDtfs, 12 SDslu, 562 SDs, 0 SdLazy, 95 SolverSat, 0 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 104 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=38occurred 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: 0.1s AutomataMinimizationTime, 5 MinimizatonAttempts, 8 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 0.4s InterpolantComputationTime, 134 NumberOfCodeBlocks, 128 NumberOfCodeBlocksAsserted, 11 NumberOfCheckSat, 102 ConstructedInterpolants, 0 QuantifiedInterpolants, 3394 SizeOfPredicates, 7 NumberOfNonLiveVariables, 230 ConjunctsInSsa, 47 ConjunctsInUnsatCore, 5 InterpolantComputations, 5 PerfectInterpolantSequences, 8/8 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...