/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 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/id2_b2_o3.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 21:36:35,124 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-07-20 21:36:35,141 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 21:36:35,142 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 21:36:35,144 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 21:36:35,146 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 21:36:35,147 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 21:36:35,148 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 21:36:35,150 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 21:36:35,151 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 21:36:35,151 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 21:36:35,152 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 21:36:35,153 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 21:36:35,155 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 21:36:35,156 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 21:36:35,157 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 21:36:35,158 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 21:36:35,160 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 21:36:35,162 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 21:36:35,163 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 21:36:35,164 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 21:36:35,165 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 21:36:35,168 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 21:36:35,185 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 21:36:35,186 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 21:36:35,186 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 21:36:35,187 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 [2020-07-20 21:36:35,212 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 21:36:35,213 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 21:36:35,215 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 21:36:35,215 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 21:36:35,215 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 21:36:35,216 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 21:36:35,216 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 21:36:35,216 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 21:36:35,216 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 21:36:35,216 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 21:36:35,217 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 21:36:35,218 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 21:36:35,218 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 21:36:35,218 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 21:36:35,219 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 21:36:35,219 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 21:36:35,219 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 21:36:35,219 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 21:36:35,219 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 21:36:35,220 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 21:36:35,220 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 21:36:35,220 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 21:36:35,220 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 21:36:35,220 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 21:36:35,221 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 21:36:35,221 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 21:36:35,221 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:35,221 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 21:36:35,221 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 21:36:35,221 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 -> 4 [2020-07-20 21:36:35,515 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 21:36:35,528 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 21:36:35,531 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 21:36:35,532 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 21:36:35,533 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 21:36:35,534 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id2_b2_o3.c [2020-07-20 21:36:35,604 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/deb9078d2/13a80c9286c8468fbd45f4f0088add32/FLAGc2ab494d8 [2020-07-20 21:36:36,077 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 21:36:36,077 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id2_b2_o3.c [2020-07-20 21:36:36,084 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/deb9078d2/13a80c9286c8468fbd45f4f0088add32/FLAGc2ab494d8 [2020-07-20 21:36:36,500 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/deb9078d2/13a80c9286c8468fbd45f4f0088add32 [2020-07-20 21:36:36,511 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 21:36:36,513 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 21:36:36,514 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 21:36:36,514 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 21:36:36,518 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 21:36:36,519 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:36:36" (1/1) ... [2020-07-20 21:36:36,523 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2cf582a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:36, skipping insertion in model container [2020-07-20 21:36:36,523 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:36:36" (1/1) ... [2020-07-20 21:36:36,532 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 21:36:36,554 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 21:36:36,754 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 21:36:36,759 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 21:36:36,782 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 21:36:36,802 INFO L208 MainTranslator]: Completed translation [2020-07-20 21:36:36,802 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:36 WrapperNode [2020-07-20 21:36:36,803 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 21:36:36,804 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 21:36:36,804 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 21:36:36,804 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 21:36:36,823 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:36" (1/1) ... [2020-07-20 21:36:36,824 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:36" (1/1) ... [2020-07-20 21:36:36,934 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:36" (1/1) ... [2020-07-20 21:36:36,935 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:36" (1/1) ... [2020-07-20 21:36:36,940 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:36" (1/1) ... [2020-07-20 21:36:36,943 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:36" (1/1) ... [2020-07-20 21:36:36,944 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:36" (1/1) ... [2020-07-20 21:36:36,946 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 21:36:36,946 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 21:36:36,946 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 21:36:36,946 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 21:36:36,948 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:36" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 21:36:37,029 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 21:36:37,029 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 21:36:37,029 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-07-20 21:36:37,029 INFO L138 BoogieDeclarations]: Found implementation of procedure id2 [2020-07-20 21:36:37,030 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 21:36:37,030 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-20 21:36:37,031 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 21:36:37,031 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-07-20 21:36:37,031 INFO L130 BoogieDeclarations]: Found specification of procedure id2 [2020-07-20 21:36:37,031 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 21:36:37,032 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 21:36:37,033 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 21:36:37,262 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 21:36:37,262 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 21:36:37,266 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:36:37 BoogieIcfgContainer [2020-07-20 21:36:37,266 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 21:36:37,267 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 21:36:37,267 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 21:36:37,270 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 21:36:37,271 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 09:36:36" (1/3) ... [2020-07-20 21:36:37,271 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5f2585b9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:36:37, skipping insertion in model container [2020-07-20 21:36:37,272 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:36" (2/3) ... [2020-07-20 21:36:37,272 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5f2585b9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:36:37, skipping insertion in model container [2020-07-20 21:36:37,272 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:36:37" (3/3) ... [2020-07-20 21:36:37,274 INFO L109 eAbstractionObserver]: Analyzing ICFG id2_b2_o3.c [2020-07-20 21:36:37,284 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 21:36:37,291 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 21:36:37,305 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 21:36:37,333 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 21:36:37,333 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 21:36:37,333 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 21:36:37,333 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 21:36:37,333 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 21:36:37,333 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 21:36:37,334 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 21:36:37,334 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 21:36:37,355 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states. [2020-07-20 21:36:37,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 21:36:37,363 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:37,364 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:37,365 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:37,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:37,372 INFO L82 PathProgramCache]: Analyzing trace with hash 128923731, now seen corresponding path program 1 times [2020-07-20 21:36:37,382 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:37,383 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [263139624] [2020-07-20 21:36:37,383 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 21:36:37,456 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:36:37,456 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:37,462 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 21:36:37,475 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:37,648 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 21:36:37,648 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:36:37,649 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [263139624] [2020-07-20 21:36:37,650 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:36:37,650 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 21:36:37,651 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [322951324] [2020-07-20 21:36:37,656 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 21:36:37,657 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:37,667 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 21:36:37,668 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 21:36:37,670 INFO L87 Difference]: Start difference. First operand 28 states. Second operand 5 states. [2020-07-20 21:36:37,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:37,730 INFO L93 Difference]: Finished difference Result 40 states and 46 transitions. [2020-07-20 21:36:37,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 21:36:37,733 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 21:36:37,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:37,744 INFO L225 Difference]: With dead ends: 40 [2020-07-20 21:36:37,745 INFO L226 Difference]: Without dead ends: 26 [2020-07-20 21:36:37,748 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 [2020-07-20 21:36:37,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-07-20 21:36:37,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-07-20 21:36:37,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 21:36:37,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2020-07-20 21:36:37,801 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 13 [2020-07-20 21:36:37,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:37,802 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2020-07-20 21:36:37,802 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 21:36:37,802 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2020-07-20 21:36:37,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 21:36:37,805 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:37,805 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:38,019 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:38,020 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:38,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:38,021 INFO L82 PathProgramCache]: Analyzing trace with hash 1945633833, now seen corresponding path program 1 times [2020-07-20 21:36:38,022 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:38,022 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1922506885] [2020-07-20 21:36:38,023 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 21:36:38,067 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:38,067 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:38,068 INFO L263 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 21:36:38,070 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:38,119 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 21:36:38,120 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:36:38,120 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1922506885] [2020-07-20 21:36:38,121 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:36:38,121 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 21:36:38,121 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [17623080] [2020-07-20 21:36:38,123 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 21:36:38,123 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:38,124 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 21:36:38,124 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 21:36:38,124 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand 5 states. [2020-07-20 21:36:38,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:38,148 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2020-07-20 21:36:38,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 21:36:38,149 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2020-07-20 21:36:38,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:38,151 INFO L225 Difference]: With dead ends: 32 [2020-07-20 21:36:38,151 INFO L226 Difference]: Without dead ends: 28 [2020-07-20 21:36:38,152 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 [2020-07-20 21:36:38,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-20 21:36:38,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-20 21:36:38,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 21:36:38,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2020-07-20 21:36:38,160 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 20 [2020-07-20 21:36:38,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:38,161 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2020-07-20 21:36:38,161 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 21:36:38,161 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2020-07-20 21:36:38,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 21:36:38,163 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:38,163 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:38,377 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:38,379 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:38,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:38,380 INFO L82 PathProgramCache]: Analyzing trace with hash 1974262984, now seen corresponding path program 1 times [2020-07-20 21:36:38,380 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:38,381 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1760196532] [2020-07-20 21:36:38,381 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 21:36:38,429 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:38,429 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:38,430 INFO L263 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 21:36:38,432 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:38,511 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 21:36:38,512 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:36:38,512 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1760196532] [2020-07-20 21:36:38,512 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:36:38,513 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-20 21:36:38,513 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [919246597] [2020-07-20 21:36:38,513 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 21:36:38,514 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:38,514 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 21:36:38,514 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-07-20 21:36:38,515 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand 8 states. [2020-07-20 21:36:38,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:38,583 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-07-20 21:36:38,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 21:36:38,584 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 20 [2020-07-20 21:36:38,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:38,586 INFO L225 Difference]: With dead ends: 48 [2020-07-20 21:36:38,586 INFO L226 Difference]: Without dead ends: 32 [2020-07-20 21:36:38,587 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-07-20 21:36:38,588 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-20 21:36:38,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-20 21:36:38,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 21:36:38,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2020-07-20 21:36:38,596 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 20 [2020-07-20 21:36:38,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:38,596 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2020-07-20 21:36:38,597 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 21:36:38,597 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2020-07-20 21:36:38,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 21:36:38,598 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:38,598 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] [2020-07-20 21:36:38,811 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:38,813 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:38,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:38,814 INFO L82 PathProgramCache]: Analyzing trace with hash 1451784300, now seen corresponding path program 1 times [2020-07-20 21:36:38,814 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:38,815 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1789655962] [2020-07-20 21:36:38,815 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:38,870 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:38,870 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:38,871 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 21:36:38,874 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:38,906 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 21:36:38,907 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:36:38,907 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1789655962] [2020-07-20 21:36:38,908 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:36:38,908 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 21:36:38,908 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [117804702] [2020-07-20 21:36:38,909 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 21:36:38,909 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:38,910 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 21:36:38,910 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 21:36:38,910 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand 5 states. [2020-07-20 21:36:38,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:38,936 INFO L93 Difference]: Finished difference Result 50 states and 57 transitions. [2020-07-20 21:36:38,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 21:36:38,937 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 27 [2020-07-20 21:36:38,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:38,939 INFO L225 Difference]: With dead ends: 50 [2020-07-20 21:36:38,939 INFO L226 Difference]: Without dead ends: 36 [2020-07-20 21:36:38,940 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 [2020-07-20 21:36:38,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-20 21:36:38,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 34. [2020-07-20 21:36:38,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-07-20 21:36:38,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 38 transitions. [2020-07-20 21:36:38,949 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 38 transitions. Word has length 27 [2020-07-20 21:36:38,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:38,949 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 38 transitions. [2020-07-20 21:36:38,949 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 21:36:38,949 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 38 transitions. [2020-07-20 21:36:38,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 21:36:38,954 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:38,954 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] [2020-07-20 21:36:39,169 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:39,171 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:39,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:39,172 INFO L82 PathProgramCache]: Analyzing trace with hash 1255270795, now seen corresponding path program 1 times [2020-07-20 21:36:39,173 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:39,173 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [180631690] [2020-07-20 21:36:39,174 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:39,213 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:39,213 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:39,215 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 21:36:39,217 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:39,365 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 21:36:39,365 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:39,772 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 21:36:39,772 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [180631690] [2020-07-20 21:36:39,773 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:39,773 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 20 [2020-07-20 21:36:39,774 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1921297394] [2020-07-20 21:36:39,775 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 21:36:39,775 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:39,776 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 21:36:39,777 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=333, Unknown=0, NotChecked=0, Total=380 [2020-07-20 21:36:39,777 INFO L87 Difference]: Start difference. First operand 34 states and 38 transitions. Second operand 20 states. [2020-07-20 21:36:39,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:39,966 INFO L93 Difference]: Finished difference Result 56 states and 65 transitions. [2020-07-20 21:36:39,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-20 21:36:39,967 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2020-07-20 21:36:39,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:39,967 INFO L225 Difference]: With dead ends: 56 [2020-07-20 21:36:39,967 INFO L226 Difference]: Without dead ends: 0 [2020-07-20 21:36:39,969 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=64, Invalid=442, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:36:39,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-20 21:36:39,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-20 21:36:39,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-20 21:36:39,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-20 21:36:39,970 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 27 [2020-07-20 21:36:39,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:39,970 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-20 21:36:39,970 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 21:36:39,970 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-20 21:36:39,970 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-20 21:36:40,178 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:40,182 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-20 21:36:40,250 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-20 21:36:40,250 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-20 21:36:40,251 INFO L268 CegarLoopResult]: For program point L17(line 17) no Hoare annotation was computed. [2020-07-20 21:36:40,251 INFO L271 CegarLoopResult]: At program point L16(line 16) the Hoare annotation is: true [2020-07-20 21:36:40,251 INFO L268 CegarLoopResult]: For program point L15(line 15) no Hoare annotation was computed. [2020-07-20 21:36:40,251 INFO L268 CegarLoopResult]: For program point L16-1(line 16) no Hoare annotation was computed. [2020-07-20 21:36:40,251 INFO L268 CegarLoopResult]: For program point id2EXIT(lines 14 19) no Hoare annotation was computed. [2020-07-20 21:36:40,251 INFO L271 CegarLoopResult]: At program point id2ENTRY(lines 14 19) the Hoare annotation is: true [2020-07-20 21:36:40,252 INFO L268 CegarLoopResult]: For program point id2FINAL(lines 14 19) no Hoare annotation was computed. [2020-07-20 21:36:40,252 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-20 21:36:40,252 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-20 21:36:40,252 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-20 21:36:40,252 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-20 21:36:40,253 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 25) no Hoare annotation was computed. [2020-07-20 21:36:40,253 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 21 27) the Hoare annotation is: true [2020-07-20 21:36:40,253 INFO L268 CegarLoopResult]: For program point L25(line 25) no Hoare annotation was computed. [2020-07-20 21:36:40,253 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 21 27) no Hoare annotation was computed. [2020-07-20 21:36:40,253 INFO L268 CegarLoopResult]: For program point L24(lines 24 26) no Hoare annotation was computed. [2020-07-20 21:36:40,253 INFO L271 CegarLoopResult]: At program point L23(line 23) the Hoare annotation is: true [2020-07-20 21:36:40,254 INFO L268 CegarLoopResult]: For program point L23-1(line 23) no Hoare annotation was computed. [2020-07-20 21:36:40,254 INFO L268 CegarLoopResult]: For program point L24-2(lines 21 27) no Hoare annotation was computed. [2020-07-20 21:36:40,254 INFO L268 CegarLoopResult]: For program point idFINAL(lines 7 12) no Hoare annotation was computed. [2020-07-20 21:36:40,254 INFO L268 CegarLoopResult]: For program point idEXIT(lines 7 12) no Hoare annotation was computed. [2020-07-20 21:36:40,254 INFO L268 CegarLoopResult]: For program point L10(line 10) no Hoare annotation was computed. [2020-07-20 21:36:40,254 INFO L271 CegarLoopResult]: At program point L9(line 9) the Hoare annotation is: true [2020-07-20 21:36:40,255 INFO L268 CegarLoopResult]: For program point L8(line 8) no Hoare annotation was computed. [2020-07-20 21:36:40,255 INFO L268 CegarLoopResult]: For program point L9-1(line 9) no Hoare annotation was computed. [2020-07-20 21:36:40,255 INFO L271 CegarLoopResult]: At program point idENTRY(lines 7 12) the Hoare annotation is: true [2020-07-20 21:36:40,262 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 09:36:40 BoogieIcfgContainer [2020-07-20 21:36:40,262 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 21:36:40,266 INFO L168 Benchmark]: Toolchain (without parser) took 3751.94 ms. Allocated memory was 137.9 MB in the beginning and 234.9 MB in the end (delta: 97.0 MB). Free memory was 102.8 MB in the beginning and 129.3 MB in the end (delta: -26.5 MB). Peak memory consumption was 70.5 MB. Max. memory is 7.1 GB. [2020-07-20 21:36:40,267 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 137.9 MB. Free memory was 120.9 MB in the beginning and 120.7 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-07-20 21:36:40,268 INFO L168 Benchmark]: CACSL2BoogieTranslator took 288.92 ms. Allocated memory is still 137.9 MB. Free memory was 102.4 MB in the beginning and 92.9 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. [2020-07-20 21:36:40,269 INFO L168 Benchmark]: Boogie Preprocessor took 142.21 ms. Allocated memory was 137.9 MB in the beginning and 202.9 MB in the end (delta: 65.0 MB). Free memory was 92.9 MB in the beginning and 181.7 MB in the end (delta: -88.9 MB). Peak memory consumption was 14.5 MB. Max. memory is 7.1 GB. [2020-07-20 21:36:40,270 INFO L168 Benchmark]: RCFGBuilder took 320.04 ms. Allocated memory is still 202.9 MB. Free memory was 181.3 MB in the beginning and 168.7 MB in the end (delta: 12.6 MB). Peak memory consumption was 12.6 MB. Max. memory is 7.1 GB. [2020-07-20 21:36:40,271 INFO L168 Benchmark]: TraceAbstraction took 2994.81 ms. Allocated memory was 202.9 MB in the beginning and 234.9 MB in the end (delta: 32.0 MB). Free memory was 168.0 MB in the beginning and 129.3 MB in the end (delta: 38.7 MB). Peak memory consumption was 70.7 MB. Max. memory is 7.1 GB. [2020-07-20 21:36:40,275 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 137.9 MB. Free memory was 120.9 MB in the beginning and 120.7 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 288.92 ms. Allocated memory is still 137.9 MB. Free memory was 102.4 MB in the beginning and 92.9 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 142.21 ms. Allocated memory was 137.9 MB in the beginning and 202.9 MB in the end (delta: 65.0 MB). Free memory was 92.9 MB in the beginning and 181.7 MB in the end (delta: -88.9 MB). Peak memory consumption was 14.5 MB. Max. memory is 7.1 GB. * RCFGBuilder took 320.04 ms. Allocated memory is still 202.9 MB. Free memory was 181.3 MB in the beginning and 168.7 MB in the end (delta: 12.6 MB). Peak memory consumption was 12.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2994.81 ms. Allocated memory was 202.9 MB in the beginning and 234.9 MB in the end (delta: 32.0 MB). Free memory was 168.0 MB in the beginning and 129.3 MB in the end (delta: 38.7 MB). Peak memory consumption was 70.7 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 25]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 28 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 2.8s, OverallIterations: 5, TraceHistogramMax: 2, AutomataDifference: 0.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 140 SDtfs, 14 SDslu, 712 SDs, 0 SdLazy, 160 SolverSat, 7 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 133 GetRequests, 96 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=34occurred in iteration=4, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 5 MinimizatonAttempts, 6 StatesRemovedByMinimization, 3 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 9 LocationsWithAnnotation, 11 PreInvPairs, 11 NumberOfFragments, 9 HoareAnnotationTreeSize, 11 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 9 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.9s InterpolantComputationTime, 107 NumberOfCodeBlocks, 80 NumberOfCodeBlocksAsserted, 14 NumberOfCheckSat, 128 ConstructedInterpolants, 0 QuantifiedInterpolants, 5890 SizeOfPredicates, 8 NumberOfNonLiveVariables, 203 ConjunctsInSsa, 54 ConjunctsInUnsatCore, 6 InterpolantComputations, 4 PerfectInterpolantSequences, 8/12 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...