/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/string-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 16:43:47,794 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 16:43:47,797 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 16:43:47,812 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 16:43:47,812 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 16:43:47,814 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 16:43:47,815 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 16:43:47,817 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 16:43:47,819 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 16:43:47,820 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 16:43:47,821 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 16:43:47,823 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 16:43:47,823 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 16:43:47,824 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 16:43:47,825 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 16:43:47,826 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 16:43:47,827 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 16:43:47,828 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 16:43:47,830 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 16:43:47,832 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 16:43:47,834 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 16:43:47,835 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 16:43:47,836 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 16:43:47,837 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 16:43:47,840 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 16:43:47,848 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 16:43:47,849 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 16:43:47,849 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 16:43:47,850 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 16:43:47,871 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 16:43:47,871 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 16:43:47,872 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 16:43:47,872 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 16:43:47,873 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 16:43:47,873 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 16:43:47,873 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 16:43:47,873 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 16:43:47,873 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 16:43:47,875 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 16:43:47,876 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 16:43:47,876 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 16:43:47,876 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 16:43:47,876 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 16:43:47,876 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 16:43:47,877 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 16:43:47,877 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 16:43:47,877 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 16:43:47,877 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 16:43:47,878 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 16:43:47,878 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 16:43:47,878 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:43:47,880 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 16:43:47,880 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 16:43:47,880 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 16:43:47,880 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 16:43:47,880 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:43:47,881 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 16:43:47,881 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 16:43:47,881 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 16:43:48,278 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 16:43:48,296 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 16:43:48,301 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 16:43:48,302 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 16:43:48,303 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 16:43:48,304 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/string-1.i [2020-07-21 16:43:48,382 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b7e96ba85/f5437c088e0d46d6bb4e127b291a3b7e/FLAG4d9123e05 [2020-07-21 16:43:48,886 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 16:43:48,887 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/string-1.i [2020-07-21 16:43:48,899 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b7e96ba85/f5437c088e0d46d6bb4e127b291a3b7e/FLAG4d9123e05 [2020-07-21 16:43:49,235 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b7e96ba85/f5437c088e0d46d6bb4e127b291a3b7e [2020-07-21 16:43:49,246 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 16:43:49,249 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 16:43:49,250 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 16:43:49,250 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 16:43:49,255 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 16:43:49,256 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:43:49" (1/1) ... [2020-07-21 16:43:49,259 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@28715b5e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:43:49, skipping insertion in model container [2020-07-21 16:43:49,260 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:43:49" (1/1) ... [2020-07-21 16:43:49,269 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 16:43:49,290 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 16:43:49,474 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:43:49,479 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 16:43:49,509 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:43:49,530 INFO L208 MainTranslator]: Completed translation [2020-07-21 16:43:49,531 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:43:49 WrapperNode [2020-07-21 16:43:49,531 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 16:43:49,532 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 16:43:49,532 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 16:43:49,532 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 16:43:49,638 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:43:49" (1/1) ... [2020-07-21 16:43:49,638 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:43:49" (1/1) ... [2020-07-21 16:43:49,648 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:43:49" (1/1) ... [2020-07-21 16:43:49,648 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:43:49" (1/1) ... [2020-07-21 16:43:49,659 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:43:49" (1/1) ... [2020-07-21 16:43:49,667 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:43:49" (1/1) ... [2020-07-21 16:43:49,669 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:43:49" (1/1) ... [2020-07-21 16:43:49,672 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 16:43:49,673 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 16:43:49,673 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 16:43:49,673 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 16:43:49,674 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:43:49" (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 16:43:49,743 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 16:43:49,744 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 16:43:49,744 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 16:43:49,744 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 16:43:49,744 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 16:43:49,744 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 16:43:49,744 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 16:43:49,745 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 16:43:49,745 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 16:43:49,745 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-07-21 16:43:49,745 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 16:43:49,745 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-21 16:43:49,745 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-21 16:43:49,746 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-21 16:43:49,746 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-21 16:43:49,746 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 16:43:49,746 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 16:43:50,090 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 16:43:50,090 INFO L295 CfgBuilder]: Removed 5 assume(true) statements. [2020-07-21 16:43:50,098 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:43:50 BoogieIcfgContainer [2020-07-21 16:43:50,099 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 16:43:50,100 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 16:43:50,101 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 16:43:50,104 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 16:43:50,105 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 04:43:49" (1/3) ... [2020-07-21 16:43:50,106 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@b898b12 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:43:50, skipping insertion in model container [2020-07-21 16:43:50,106 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:43:49" (2/3) ... [2020-07-21 16:43:50,106 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@b898b12 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:43:50, skipping insertion in model container [2020-07-21 16:43:50,107 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:43:50" (3/3) ... [2020-07-21 16:43:50,110 INFO L109 eAbstractionObserver]: Analyzing ICFG string-1.i [2020-07-21 16:43:50,130 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 16:43:50,142 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 16:43:50,161 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 16:43:50,198 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 16:43:50,198 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 16:43:50,198 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 16:43:50,199 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 16:43:50,199 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 16:43:50,199 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 16:43:50,200 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 16:43:50,200 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 16:43:50,226 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states. [2020-07-21 16:43:50,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 16:43:50,237 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:43:50,238 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:43:50,239 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:43:50,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:43:50,247 INFO L82 PathProgramCache]: Analyzing trace with hash -522531256, now seen corresponding path program 1 times [2020-07-21 16:43:50,256 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:43:50,256 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1534120501] [2020-07-21 16:43:50,257 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 16:43:50,372 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:43:50,373 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:43:50,377 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-21 16:43:50,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:43:50,420 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 16:43:50,421 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:43:50,425 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1534120501] [2020-07-21 16:43:50,429 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:43:50,430 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-21 16:43:50,432 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2006449932] [2020-07-21 16:43:50,439 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-21 16:43:50,439 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:43:50,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-21 16:43:50,452 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 16:43:50,455 INFO L87 Difference]: Start difference. First operand 35 states. Second operand 2 states. [2020-07-21 16:43:50,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:43:50,483 INFO L93 Difference]: Finished difference Result 62 states and 89 transitions. [2020-07-21 16:43:50,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-21 16:43:50,485 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 22 [2020-07-21 16:43:50,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:43:50,494 INFO L225 Difference]: With dead ends: 62 [2020-07-21 16:43:50,495 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 16:43:50,499 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 16:43:50,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 16:43:50,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-07-21 16:43:50,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-21 16:43:50,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 33 transitions. [2020-07-21 16:43:50,546 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 33 transitions. Word has length 22 [2020-07-21 16:43:50,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:43:50,546 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 33 transitions. [2020-07-21 16:43:50,547 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-21 16:43:50,547 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 33 transitions. [2020-07-21 16:43:50,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-21 16:43:50,548 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:43:50,548 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:43:50,764 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:43:50,764 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:43:50,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:43:50,765 INFO L82 PathProgramCache]: Analyzing trace with hash 1282672092, now seen corresponding path program 1 times [2020-07-21 16:43:50,766 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:43:50,766 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [602661919] [2020-07-21 16:43:50,767 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 16:43:50,831 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:43:50,832 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:43:50,833 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 16:43:50,836 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:43:50,874 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 16:43:50,874 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:43:50,875 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [602661919] [2020-07-21 16:43:50,875 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:43:50,876 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:43:50,876 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [670280] [2020-07-21 16:43:50,878 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:43:50,879 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:43:50,879 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:43:50,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:43:50,880 INFO L87 Difference]: Start difference. First operand 28 states and 33 transitions. Second operand 3 states. [2020-07-21 16:43:50,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:43:50,940 INFO L93 Difference]: Finished difference Result 56 states and 69 transitions. [2020-07-21 16:43:50,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:43:50,941 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-21 16:43:50,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:43:50,944 INFO L225 Difference]: With dead ends: 56 [2020-07-21 16:43:50,945 INFO L226 Difference]: Without dead ends: 36 [2020-07-21 16:43:50,946 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:43:50,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-21 16:43:50,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 30. [2020-07-21 16:43:50,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 16:43:50,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 35 transitions. [2020-07-21 16:43:50,957 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 35 transitions. Word has length 24 [2020-07-21 16:43:50,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:43:50,957 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 35 transitions. [2020-07-21 16:43:50,958 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:43:50,958 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 35 transitions. [2020-07-21 16:43:50,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-21 16:43:50,959 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:43:50,959 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:43:51,174 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:43:51,175 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:43:51,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:43:51,176 INFO L82 PathProgramCache]: Analyzing trace with hash -1816798436, now seen corresponding path program 1 times [2020-07-21 16:43:51,176 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:43:51,177 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [572251314] [2020-07-21 16:43:51,177 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 16:43:51,266 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:43:51,267 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:43:51,270 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:43:51,277 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:43:51,314 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 16:43:51,315 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:43:51,374 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 16:43:51,375 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [572251314] [2020-07-21 16:43:51,375 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:43:51,376 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-07-21 16:43:51,376 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [608608240] [2020-07-21 16:43:51,380 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 16:43:51,381 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:43:51,382 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 16:43:51,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-21 16:43:51,383 INFO L87 Difference]: Start difference. First operand 30 states and 35 transitions. Second operand 6 states. [2020-07-21 16:43:51,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:43:51,559 INFO L93 Difference]: Finished difference Result 79 states and 102 transitions. [2020-07-21 16:43:51,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 16:43:51,560 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 28 [2020-07-21 16:43:51,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:43:51,562 INFO L225 Difference]: With dead ends: 79 [2020-07-21 16:43:51,562 INFO L226 Difference]: Without dead ends: 58 [2020-07-21 16:43:51,563 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-21 16:43:51,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-21 16:43:51,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 42. [2020-07-21 16:43:51,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-07-21 16:43:51,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 47 transitions. [2020-07-21 16:43:51,573 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 47 transitions. Word has length 28 [2020-07-21 16:43:51,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:43:51,573 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 47 transitions. [2020-07-21 16:43:51,573 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 16:43:51,574 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 47 transitions. [2020-07-21 16:43:51,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-21 16:43:51,575 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:43:51,575 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:43:51,789 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:43:51,789 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:43:51,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:43:51,790 INFO L82 PathProgramCache]: Analyzing trace with hash -1106103076, now seen corresponding path program 2 times [2020-07-21 16:43:51,791 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:43:51,792 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1350435728] [2020-07-21 16:43:51,792 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 16:43:51,918 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:43:51,919 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:43:51,921 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 16:43:51,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:43:51,973 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 16:43:51,974 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:43:52,021 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 16:43:52,022 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1350435728] [2020-07-21 16:43:52,022 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:43:52,022 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2020-07-21 16:43:52,022 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2041071615] [2020-07-21 16:43:52,023 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-21 16:43:52,023 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:43:52,024 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-21 16:43:52,024 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-07-21 16:43:52,024 INFO L87 Difference]: Start difference. First operand 42 states and 47 transitions. Second operand 7 states. [2020-07-21 16:43:52,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:43:52,149 INFO L93 Difference]: Finished difference Result 93 states and 114 transitions. [2020-07-21 16:43:52,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 16:43:52,150 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 40 [2020-07-21 16:43:52,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:43:52,151 INFO L225 Difference]: With dead ends: 93 [2020-07-21 16:43:52,152 INFO L226 Difference]: Without dead ends: 66 [2020-07-21 16:43:52,153 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 69 SyntacticMatches, 5 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-07-21 16:43:52,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-07-21 16:43:52,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 46. [2020-07-21 16:43:52,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 16:43:52,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2020-07-21 16:43:52,163 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 40 [2020-07-21 16:43:52,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:43:52,164 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2020-07-21 16:43:52,164 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-21 16:43:52,164 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2020-07-21 16:43:52,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-07-21 16:43:52,165 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:43:52,166 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:43:52,379 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:43:52,380 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:43:52,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:43:52,381 INFO L82 PathProgramCache]: Analyzing trace with hash 1061537308, now seen corresponding path program 3 times [2020-07-21 16:43:52,382 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:43:52,383 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1193469952] [2020-07-21 16:43:52,383 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 16:43:52,510 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:43:52,510 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:43:52,512 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 16:43:52,515 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:43:52,559 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 16:43:52,565 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 16:43:52,594 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2020-07-21 16:43:52,594 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:43:52,595 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1193469952] [2020-07-21 16:43:52,595 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:43:52,595 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-07-21 16:43:52,595 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [595811174] [2020-07-21 16:43:52,596 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-21 16:43:52,596 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:43:52,597 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-21 16:43:52,597 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-07-21 16:43:52,597 INFO L87 Difference]: Start difference. First operand 46 states and 51 transitions. Second operand 7 states. [2020-07-21 16:43:52,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:43:52,686 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2020-07-21 16:43:52,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 16:43:52,687 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 44 [2020-07-21 16:43:52,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:43:52,689 INFO L225 Difference]: With dead ends: 62 [2020-07-21 16:43:52,689 INFO L226 Difference]: Without dead ends: 48 [2020-07-21 16:43:52,690 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-07-21 16:43:52,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-21 16:43:52,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-07-21 16:43:52,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-07-21 16:43:52,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 53 transitions. [2020-07-21 16:43:52,698 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 53 transitions. Word has length 44 [2020-07-21 16:43:52,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:43:52,699 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 53 transitions. [2020-07-21 16:43:52,699 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-21 16:43:52,699 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 53 transitions. [2020-07-21 16:43:52,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-07-21 16:43:52,700 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:43:52,701 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:43:52,914 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:43:52,915 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:43:52,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:43:52,916 INFO L82 PathProgramCache]: Analyzing trace with hash -637010121, now seen corresponding path program 1 times [2020-07-21 16:43:52,916 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:43:52,917 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1329787094] [2020-07-21 16:43:52,917 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 16:43:53,090 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:43:53,090 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:43:53,093 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 16:43:53,096 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:43:53,126 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 16:43:53,128 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 16:43:53,158 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2020-07-21 16:43:53,158 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:43:53,159 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1329787094] [2020-07-21 16:43:53,159 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:43:53,159 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-21 16:43:53,160 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [978107905] [2020-07-21 16:43:53,160 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 16:43:53,160 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:43:53,161 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 16:43:53,161 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-07-21 16:43:53,161 INFO L87 Difference]: Start difference. First operand 48 states and 53 transitions. Second operand 8 states. [2020-07-21 16:43:53,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:43:53,281 INFO L93 Difference]: Finished difference Result 56 states and 62 transitions. [2020-07-21 16:43:53,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 16:43:53,282 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 46 [2020-07-21 16:43:53,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:43:53,284 INFO L225 Difference]: With dead ends: 56 [2020-07-21 16:43:53,284 INFO L226 Difference]: Without dead ends: 50 [2020-07-21 16:43:53,285 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=94, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:43:53,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-07-21 16:43:53,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2020-07-21 16:43:53,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-07-21 16:43:53,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2020-07-21 16:43:53,293 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 46 [2020-07-21 16:43:53,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:43:53,293 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2020-07-21 16:43:53,293 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 16:43:53,294 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2020-07-21 16:43:53,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-07-21 16:43:53,295 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:43:53,295 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:43:53,509 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:43:53,510 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:43:53,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:43:53,511 INFO L82 PathProgramCache]: Analyzing trace with hash -1604149734, now seen corresponding path program 1 times [2020-07-21 16:43:53,511 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:43:53,511 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [634016069] [2020-07-21 16:43:53,512 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 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:43:53,636 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:43:53,637 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:43:53,638 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 16:43:53,642 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:43:53,675 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2020-07-21 16:43:53,676 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:43:53,676 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [634016069] [2020-07-21 16:43:53,676 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:43:53,676 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 16:43:53,677 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [753952425] [2020-07-21 16:43:53,677 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 16:43:53,677 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:43:53,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 16:43:53,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-07-21 16:43:53,678 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand 4 states. [2020-07-21 16:43:53,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:43:53,718 INFO L93 Difference]: Finished difference Result 67 states and 75 transitions. [2020-07-21 16:43:53,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 16:43:53,719 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 48 [2020-07-21 16:43:53,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:43:53,720 INFO L225 Difference]: With dead ends: 67 [2020-07-21 16:43:53,720 INFO L226 Difference]: Without dead ends: 51 [2020-07-21 16:43:53,721 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-07-21 16:43:53,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-07-21 16:43:53,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-07-21 16:43:53,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 16:43:53,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 56 transitions. [2020-07-21 16:43:53,732 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 56 transitions. Word has length 48 [2020-07-21 16:43:53,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:43:53,733 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 56 transitions. [2020-07-21 16:43:53,733 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 16:43:53,733 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 56 transitions. [2020-07-21 16:43:53,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-07-21 16:43:53,734 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:43:53,734 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:43:53,948 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:43:53,949 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:43:53,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:43:53,949 INFO L82 PathProgramCache]: Analyzing trace with hash 855134175, now seen corresponding path program 1 times [2020-07-21 16:43:53,950 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:43:53,950 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1866877072] [2020-07-21 16:43:53,951 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 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:43:54,117 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:43:54,118 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:43:54,119 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 16:43:54,122 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:43:54,174 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 16:43:54,175 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 16:43:54,204 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2020-07-21 16:43:54,204 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:43:54,222 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:43:54,246 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2020-07-21 16:43:54,247 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1866877072] [2020-07-21 16:43:54,247 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2020-07-21 16:43:54,247 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [9] total 10 [2020-07-21 16:43:54,248 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1600007091] [2020-07-21 16:43:54,248 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 16:43:54,249 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:43:54,249 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 16:43:54,249 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 16:43:54,249 INFO L87 Difference]: Start difference. First operand 51 states and 56 transitions. Second operand 5 states. [2020-07-21 16:43:54,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:43:54,266 INFO L93 Difference]: Finished difference Result 51 states and 56 transitions. [2020-07-21 16:43:54,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 16:43:54,266 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 50 [2020-07-21 16:43:54,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:43:54,267 INFO L225 Difference]: With dead ends: 51 [2020-07-21 16:43:54,267 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 16:43:54,268 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 89 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2020-07-21 16:43:54,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 16:43:54,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 16:43:54,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 16:43:54,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 16:43:54,269 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 50 [2020-07-21 16:43:54,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:43:54,269 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 16:43:54,269 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 16:43:54,269 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 16:43:54,269 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 16:43:54,470 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:43:54,474 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 16:43:54,689 INFO L268 CegarLoopResult]: For program point ULTIMATE.initFINAL(line -1) no Hoare annotation was computed. [2020-07-21 16:43:54,689 INFO L271 CegarLoopResult]: At program point ULTIMATE.initENTRY(line -1) the Hoare annotation is: true [2020-07-21 16:43:54,690 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 16:43:54,690 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 16:43:54,690 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 16:43:54,690 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 16:43:54,690 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 16:43:54,690 INFO L268 CegarLoopResult]: For program point assume_abort_if_notENTRY(lines 4 6) no Hoare annotation was computed. [2020-07-21 16:43:54,690 INFO L268 CegarLoopResult]: For program point L5(line 5) no Hoare annotation was computed. [2020-07-21 16:43:54,691 INFO L268 CegarLoopResult]: For program point L5-2(lines 4 6) no Hoare annotation was computed. [2020-07-21 16:43:54,691 INFO L268 CegarLoopResult]: For program point assume_abort_if_notEXIT(lines 4 6) no Hoare annotation was computed. [2020-07-21 16:43:54,691 INFO L264 CegarLoopResult]: At program point L35-3(lines 35 36) the Hoare annotation is: (and (<= 0 main_~nc_B~0) (= 0 main_~found~0)) [2020-07-21 16:43:54,691 INFO L268 CegarLoopResult]: For program point L35-4(lines 18 61) no Hoare annotation was computed. [2020-07-21 16:43:54,691 INFO L268 CegarLoopResult]: For program point L31-1(lines 31 32) no Hoare annotation was computed. [2020-07-21 16:43:54,692 INFO L264 CegarLoopResult]: At program point L31-3(lines 31 32) the Hoare annotation is: (= 0 main_~found~0) [2020-07-21 16:43:54,692 INFO L268 CegarLoopResult]: For program point L31-4(lines 31 32) no Hoare annotation was computed. [2020-07-21 16:43:54,692 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 17 61) no Hoare annotation was computed. [2020-07-21 16:43:54,692 INFO L268 CegarLoopResult]: For program point L44(lines 44 53) no Hoare annotation was computed. [2020-07-21 16:43:54,692 INFO L264 CegarLoopResult]: At program point L44-2(lines 42 54) the Hoare annotation is: (or (and (<= 1 main_~nc_B~0) (= 0 main_~found~0)) (and (<= 0 main_~j~0) (<= main_~nc_B~0 0))) [2020-07-21 16:43:54,692 INFO L268 CegarLoopResult]: For program point L28(line 28) no Hoare annotation was computed. [2020-07-21 16:43:54,692 INFO L268 CegarLoopResult]: For program point L24(line 24) no Hoare annotation was computed. [2020-07-21 16:43:54,693 INFO L264 CegarLoopResult]: At program point L58(line 58) the Hoare annotation is: (let ((.cse0 (= 1 main_~found~0))) (or (and (or .cse0 (= 0 main_~found~0)) (<= 1 main_~nc_B~0)) (and .cse0 (<= 0 main_~j~0)))) [2020-07-21 16:43:54,693 INFO L268 CegarLoopResult]: For program point L58-1(line 58) no Hoare annotation was computed. [2020-07-21 16:43:54,693 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 17 61) no Hoare annotation was computed. [2020-07-21 16:43:54,693 INFO L268 CegarLoopResult]: For program point L42-2(lines 42 54) no Hoare annotation was computed. [2020-07-21 16:43:54,693 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 17 61) the Hoare annotation is: true [2020-07-21 16:43:54,693 INFO L268 CegarLoopResult]: For program point L26-2(lines 26 27) no Hoare annotation was computed. [2020-07-21 16:43:54,694 INFO L264 CegarLoopResult]: At program point L26-3(lines 26 27) the Hoare annotation is: (= 0 main_~found~0) [2020-07-21 16:43:54,694 INFO L268 CegarLoopResult]: For program point L26-4(lines 26 27) no Hoare annotation was computed. [2020-07-21 16:43:54,694 INFO L268 CegarLoopResult]: For program point L22-2(lines 22 23) no Hoare annotation was computed. [2020-07-21 16:43:54,694 INFO L264 CegarLoopResult]: At program point L22-3(lines 22 23) the Hoare annotation is: (= 0 main_~found~0) [2020-07-21 16:43:54,694 INFO L268 CegarLoopResult]: For program point L22-4(lines 22 23) no Hoare annotation was computed. [2020-07-21 16:43:54,694 INFO L268 CegarLoopResult]: For program point L35-1(lines 35 36) no Hoare annotation was computed. [2020-07-21 16:43:54,694 INFO L271 CegarLoopResult]: At program point __VERIFIER_assertENTRY(lines 7 12) the Hoare annotation is: true [2020-07-21 16:43:54,695 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertEXIT(lines 7 12) no Hoare annotation was computed. [2020-07-21 16:43:54,695 INFO L268 CegarLoopResult]: For program point L9(line 9) no Hoare annotation was computed. [2020-07-21 16:43:54,695 INFO L268 CegarLoopResult]: For program point L8(lines 8 10) no Hoare annotation was computed. [2020-07-21 16:43:54,695 INFO L268 CegarLoopResult]: For program point L8-2(lines 7 12) no Hoare annotation was computed. [2020-07-21 16:43:54,695 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 9) no Hoare annotation was computed. [2020-07-21 16:43:54,718 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 04:43:54 BoogieIcfgContainer [2020-07-21 16:43:54,718 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 16:43:54,721 INFO L168 Benchmark]: Toolchain (without parser) took 5472.82 ms. Allocated memory was 143.7 MB in the beginning and 249.6 MB in the end (delta: 105.9 MB). Free memory was 101.7 MB in the beginning and 160.5 MB in the end (delta: -58.8 MB). Peak memory consumption was 47.1 MB. Max. memory is 7.1 GB. [2020-07-21 16:43:54,722 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 143.7 MB. Free memory was 119.8 MB in the beginning and 119.6 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. [2020-07-21 16:43:54,723 INFO L168 Benchmark]: CACSL2BoogieTranslator took 281.38 ms. Allocated memory is still 143.7 MB. Free memory was 101.2 MB in the beginning and 90.7 MB in the end (delta: 10.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. [2020-07-21 16:43:54,724 INFO L168 Benchmark]: Boogie Preprocessor took 140.52 ms. Allocated memory was 143.7 MB in the beginning and 199.8 MB in the end (delta: 56.1 MB). Free memory was 90.7 MB in the beginning and 177.0 MB in the end (delta: -86.3 MB). Peak memory consumption was 10.2 MB. Max. memory is 7.1 GB. [2020-07-21 16:43:54,725 INFO L168 Benchmark]: RCFGBuilder took 426.08 ms. Allocated memory is still 199.8 MB. Free memory was 177.0 MB in the beginning and 157.5 MB in the end (delta: 19.5 MB). Peak memory consumption was 19.5 MB. Max. memory is 7.1 GB. [2020-07-21 16:43:54,726 INFO L168 Benchmark]: TraceAbstraction took 4617.90 ms. Allocated memory was 199.8 MB in the beginning and 249.6 MB in the end (delta: 49.8 MB). Free memory was 156.8 MB in the beginning and 160.5 MB in the end (delta: -3.7 MB). Peak memory consumption was 46.1 MB. Max. memory is 7.1 GB. [2020-07-21 16:43:54,730 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 143.7 MB. Free memory was 119.8 MB in the beginning and 119.6 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 281.38 ms. Allocated memory is still 143.7 MB. Free memory was 101.2 MB in the beginning and 90.7 MB in the end (delta: 10.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 140.52 ms. Allocated memory was 143.7 MB in the beginning and 199.8 MB in the end (delta: 56.1 MB). Free memory was 90.7 MB in the beginning and 177.0 MB in the end (delta: -86.3 MB). Peak memory consumption was 10.2 MB. Max. memory is 7.1 GB. * RCFGBuilder took 426.08 ms. Allocated memory is still 199.8 MB. Free memory was 177.0 MB in the beginning and 157.5 MB in the end (delta: 19.5 MB). Peak memory consumption was 19.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 4617.90 ms. Allocated memory was 199.8 MB in the beginning and 249.6 MB in the end (delta: 49.8 MB). Free memory was 156.8 MB in the beginning and 160.5 MB in the end (delta: -3.7 MB). Peak memory consumption was 46.1 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 9]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 31]: Loop Invariant Derived loop invariant: 0 == found - InvariantResult [Line: 26]: Loop Invariant Derived loop invariant: 0 == found - InvariantResult [Line: 22]: Loop Invariant Derived loop invariant: 0 == found - InvariantResult [Line: 42]: Loop Invariant Derived loop invariant: (1 <= nc_B && 0 == found) || (0 <= j && nc_B <= 0) - InvariantResult [Line: 35]: Loop Invariant Derived loop invariant: 0 <= nc_B && 0 == found - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 39 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 4.2s, OverallIterations: 8, TraceHistogramMax: 5, AutomataDifference: 0.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.2s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 229 SDtfs, 127 SDslu, 443 SDs, 0 SdLazy, 224 SolverSat, 55 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 419 GetRequests, 374 SyntacticMatches, 7 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=51occurred in iteration=7, 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, 8 MinimizatonAttempts, 43 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 11 LocationsWithAnnotation, 19 PreInvPairs, 43 NumberOfFragments, 55 HoareAnnotationTreeSize, 19 FomulaSimplifications, 280 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 11 FomulaSimplificationsInter, 14 FormulaSimplificationTreeSizeReductionInter, 0.1s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.6s SatisfiabilityAnalysisTime, 0.6s InterpolantComputationTime, 302 NumberOfCodeBlocks, 302 NumberOfCodeBlocksAsserted, 16 NumberOfCheckSat, 409 ConstructedInterpolants, 0 QuantifiedInterpolants, 23905 SizeOfPredicates, 18 NumberOfNonLiveVariables, 1034 ConjunctsInSsa, 40 ConjunctsInUnsatCore, 11 InterpolantComputations, 6 PerfectInterpolantSequences, 297/333 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...