/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/ldv-regression/test25-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 17:14:59,243 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 17:14:59,246 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 17:14:59,262 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 17:14:59,262 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 17:14:59,264 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 17:14:59,265 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 17:14:59,267 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 17:14:59,269 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 17:14:59,270 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 17:14:59,271 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 17:14:59,272 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 17:14:59,273 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 17:14:59,274 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 17:14:59,275 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 17:14:59,276 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 17:14:59,280 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 17:14:59,281 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 17:14:59,283 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 17:14:59,285 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 17:14:59,287 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 17:14:59,288 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 17:14:59,289 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 17:14:59,290 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 17:14:59,293 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 17:14:59,301 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 17:14:59,302 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 17:14:59,303 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 17:14:59,304 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 17:14:59,320 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 17:14:59,320 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 17:14:59,321 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 17:14:59,322 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 17:14:59,322 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 17:14:59,322 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 17:14:59,322 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 17:14:59,322 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 17:14:59,323 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 17:14:59,323 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 17:14:59,323 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 17:14:59,323 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 17:14:59,323 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 17:14:59,324 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 17:14:59,324 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 17:14:59,324 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 17:14:59,324 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 17:14:59,325 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 17:14:59,325 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 17:14:59,325 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 17:14:59,325 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 17:14:59,325 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 17:14:59,326 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 17:14:59,326 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 17:14:59,326 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 17:14:59,326 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 17:14:59,326 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:14:59,327 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 17:14:59,327 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 17:14:59,327 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 17:14:59,746 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 17:14:59,762 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 17:14:59,766 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 17:14:59,768 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 17:14:59,768 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 17:14:59,769 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-regression/test25-2.c [2020-07-20 17:14:59,845 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/10b59ca51/a5a2408df324472c9b2ae746aa809bcc/FLAG094a20de4 [2020-07-20 17:15:00,345 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 17:15:00,346 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/ldv-regression/test25-2.c [2020-07-20 17:15:00,354 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/10b59ca51/a5a2408df324472c9b2ae746aa809bcc/FLAG094a20de4 [2020-07-20 17:15:00,744 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/10b59ca51/a5a2408df324472c9b2ae746aa809bcc [2020-07-20 17:15:00,755 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 17:15:00,758 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 17:15:00,759 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 17:15:00,759 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 17:15:00,763 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 17:15:00,764 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:15:00" (1/1) ... [2020-07-20 17:15:00,768 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@98434ba and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:15:00, skipping insertion in model container [2020-07-20 17:15:00,768 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:15:00" (1/1) ... [2020-07-20 17:15:00,777 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 17:15:00,797 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 17:15:01,013 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:15:01,026 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 17:15:01,054 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:15:01,074 INFO L208 MainTranslator]: Completed translation [2020-07-20 17:15:01,074 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:15:01 WrapperNode [2020-07-20 17:15:01,075 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 17:15:01,075 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 17:15:01,076 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 17:15:01,076 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 17:15:01,252 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:15:01" (1/1) ... [2020-07-20 17:15:01,255 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:15:01" (1/1) ... [2020-07-20 17:15:01,282 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:15:01" (1/1) ... [2020-07-20 17:15:01,283 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:15:01" (1/1) ... [2020-07-20 17:15:01,303 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:15:01" (1/1) ... [2020-07-20 17:15:01,310 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:15:01" (1/1) ... [2020-07-20 17:15:01,325 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:15:01" (1/1) ... [2020-07-20 17:15:01,330 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 17:15:01,333 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 17:15:01,333 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 17:15:01,333 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 17:15:01,335 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:15:01" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 17:15:01,410 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 17:15:01,410 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 17:15:01,410 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2020-07-20 17:15:01,410 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 17:15:01,410 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 17:15:01,411 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 17:15:01,411 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-07-20 17:15:01,411 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-07-20 17:15:01,411 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-20 17:15:01,411 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 17:15:01,411 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-20 17:15:01,412 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-20 17:15:01,412 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-07-20 17:15:01,412 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-20 17:15:01,412 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 17:15:01,412 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 17:15:01,741 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 17:15:01,741 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-07-20 17:15:01,747 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:15:01 BoogieIcfgContainer [2020-07-20 17:15:01,747 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 17:15:01,749 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 17:15:01,749 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 17:15:01,753 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 17:15:01,754 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 05:15:00" (1/3) ... [2020-07-20 17:15:01,755 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@46dac452 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:15:01, skipping insertion in model container [2020-07-20 17:15:01,755 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:15:01" (2/3) ... [2020-07-20 17:15:01,756 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@46dac452 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:15:01, skipping insertion in model container [2020-07-20 17:15:01,756 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:15:01" (3/3) ... [2020-07-20 17:15:01,759 INFO L109 eAbstractionObserver]: Analyzing ICFG test25-2.c [2020-07-20 17:15:01,773 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 17:15:01,787 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 17:15:01,812 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 17:15:01,847 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 17:15:01,847 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 17:15:01,848 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 17:15:01,848 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 17:15:01,849 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 17:15:01,849 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 17:15:01,849 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 17:15:01,850 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 17:15:01,873 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-07-20 17:15:01,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-20 17:15:01,881 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:15:01,882 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:15:01,883 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:15:01,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:15:01,893 INFO L82 PathProgramCache]: Analyzing trace with hash -899836778, now seen corresponding path program 1 times [2020-07-20 17:15:01,904 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:15:01,905 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1502639856] [2020-07-20 17:15:01,906 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:15:02,184 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:15:02,185 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:15:02,190 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-20 17:15:02,200 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:15:02,229 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:15:02,229 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:15:02,231 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1502639856] [2020-07-20 17:15:02,232 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:15:02,233 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-20 17:15:02,234 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1157209759] [2020-07-20 17:15:02,241 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-20 17:15:02,242 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:15:02,261 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-20 17:15:02,262 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 17:15:02,265 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 2 states. [2020-07-20 17:15:02,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:15:02,295 INFO L93 Difference]: Finished difference Result 42 states and 52 transitions. [2020-07-20 17:15:02,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-20 17:15:02,298 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2020-07-20 17:15:02,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:15:02,309 INFO L225 Difference]: With dead ends: 42 [2020-07-20 17:15:02,310 INFO L226 Difference]: Without dead ends: 20 [2020-07-20 17:15:02,314 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 17:15:02,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-07-20 17:15:02,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-07-20 17:15:02,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-07-20 17:15:02,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2020-07-20 17:15:02,367 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2020-07-20 17:15:02,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:15:02,367 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2020-07-20 17:15:02,368 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-20 17:15:02,368 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2020-07-20 17:15:02,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-20 17:15:02,369 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:15:02,369 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:15:02,585 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:15:02,586 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:15:02,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:15:02,587 INFO L82 PathProgramCache]: Analyzing trace with hash -1137678901, now seen corresponding path program 1 times [2020-07-20 17:15:02,588 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:15:02,589 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [467042765] [2020-07-20 17:15:02,589 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:15:02,669 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 17:15:02,669 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:15:02,671 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-20 17:15:02,675 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:15:02,816 INFO L173 IndexEqualityManager]: detected equality via solver [2020-07-20 17:15:02,824 INFO L350 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-07-20 17:15:02,825 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 12 [2020-07-20 17:15:02,829 INFO L544 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-07-20 17:15:02,838 INFO L624 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-07-20 17:15:02,842 INFO L544 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-07-20 17:15:02,842 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 4 variables, input treesize:38, output treesize:5 [2020-07-20 17:15:02,859 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:15:02,860 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:15:02,860 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [467042765] [2020-07-20 17:15:02,861 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:15:02,861 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 17:15:02,861 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2108510439] [2020-07-20 17:15:02,863 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 17:15:02,864 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:15:02,864 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 17:15:02,864 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 17:15:02,865 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 5 states. [2020-07-20 17:15:02,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:15:02,958 INFO L93 Difference]: Finished difference Result 30 states and 31 transitions. [2020-07-20 17:15:02,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 17:15:02,959 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 18 [2020-07-20 17:15:02,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:15:02,960 INFO L225 Difference]: With dead ends: 30 [2020-07-20 17:15:02,961 INFO L226 Difference]: Without dead ends: 22 [2020-07-20 17:15:02,962 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 17:15:02,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-07-20 17:15:02,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-07-20 17:15:02,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-07-20 17:15:02,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2020-07-20 17:15:02,970 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 18 [2020-07-20 17:15:02,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:15:02,971 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2020-07-20 17:15:02,971 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 17:15:02,971 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2020-07-20 17:15:02,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 17:15:02,972 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:15:02,973 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:15:03,187 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:15:03,188 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:15:03,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:15:03,189 INFO L82 PathProgramCache]: Analyzing trace with hash 2046677126, now seen corresponding path program 1 times [2020-07-20 17:15:03,190 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:15:03,190 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [628715925] [2020-07-20 17:15:03,191 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:15:03,259 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 17:15:03,260 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:15:03,262 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 17:15:03,264 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:15:03,380 INFO L173 IndexEqualityManager]: detected equality via solver [2020-07-20 17:15:03,385 INFO L350 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-07-20 17:15:03,386 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 12 [2020-07-20 17:15:03,388 INFO L544 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-07-20 17:15:03,415 INFO L624 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-07-20 17:15:03,422 INFO L544 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-07-20 17:15:03,422 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 4 variables, input treesize:38, output treesize:5 [2020-07-20 17:15:03,442 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:15:03,442 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:15:03,523 INFO L350 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-07-20 17:15:03,524 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 22 [2020-07-20 17:15:03,527 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-20 17:15:03,531 INFO L544 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2020-07-20 17:15:03,541 INFO L624 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-07-20 17:15:03,542 INFO L544 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 2 xjuncts. [2020-07-20 17:15:03,543 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:18, output treesize:12 [2020-07-20 17:15:03,556 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:15:03,556 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [628715925] [2020-07-20 17:15:03,557 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:15:03,557 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 9 [2020-07-20 17:15:03,557 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [447399433] [2020-07-20 17:15:03,558 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 17:15:03,558 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:15:03,559 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 17:15:03,559 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 17:15:03,559 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand 9 states. [2020-07-20 17:15:03,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:15:03,755 INFO L93 Difference]: Finished difference Result 36 states and 39 transitions. [2020-07-20 17:15:03,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 17:15:03,758 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 20 [2020-07-20 17:15:03,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:15:03,760 INFO L225 Difference]: With dead ends: 36 [2020-07-20 17:15:03,761 INFO L226 Difference]: Without dead ends: 28 [2020-07-20 17:15:03,762 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=52, Invalid=104, Unknown=0, NotChecked=0, Total=156 [2020-07-20 17:15:03,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-20 17:15:03,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-07-20 17:15:03,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-20 17:15:03,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2020-07-20 17:15:03,773 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 20 [2020-07-20 17:15:03,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:15:03,773 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2020-07-20 17:15:03,773 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 17:15:03,774 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2020-07-20 17:15:03,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 17:15:03,776 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:15:03,776 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:15:03,989 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:15:03,993 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:15:03,993 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:15:03,994 INFO L82 PathProgramCache]: Analyzing trace with hash 1379024951, now seen corresponding path program 2 times [2020-07-20 17:15:03,994 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:15:03,995 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1328266878] [2020-07-20 17:15:03,996 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:15:04,092 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:15:04,093 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:15:04,095 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-20 17:15:04,098 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:15:08,098 INFO L173 IndexEqualityManager]: detected equality via solver [2020-07-20 17:15:08,101 INFO L350 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-07-20 17:15:08,101 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 12 [2020-07-20 17:15:08,103 INFO L544 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-07-20 17:15:08,110 INFO L624 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-07-20 17:15:08,113 INFO L544 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-07-20 17:15:08,113 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 4 variables, input treesize:38, output treesize:5 [2020-07-20 17:15:08,135 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:15:08,136 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:15:08,357 INFO L350 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-07-20 17:15:08,358 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 22 [2020-07-20 17:15:08,360 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-20 17:15:08,361 INFO L544 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2020-07-20 17:15:08,368 INFO L624 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-07-20 17:15:08,369 INFO L544 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 2 xjuncts. [2020-07-20 17:15:08,370 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:18, output treesize:12 [2020-07-20 17:15:08,383 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:15:08,383 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1328266878] [2020-07-20 17:15:08,384 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:15:08,384 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 15 [2020-07-20 17:15:08,384 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [527634062] [2020-07-20 17:15:08,385 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 17:15:08,385 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:15:08,385 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 17:15:08,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=137, Unknown=0, NotChecked=0, Total=210 [2020-07-20 17:15:08,386 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand 15 states. [2020-07-20 17:15:14,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:15:14,731 INFO L93 Difference]: Finished difference Result 48 states and 54 transitions. [2020-07-20 17:15:14,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-07-20 17:15:14,733 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 26 [2020-07-20 17:15:14,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:15:14,734 INFO L225 Difference]: With dead ends: 48 [2020-07-20 17:15:14,734 INFO L226 Difference]: Without dead ends: 40 [2020-07-20 17:15:14,736 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 8.7s TimeCoverageRelationStatistics Valid=208, Invalid=392, Unknown=0, NotChecked=0, Total=600 [2020-07-20 17:15:14,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-07-20 17:15:14,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-07-20 17:15:14,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-20 17:15:14,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2020-07-20 17:15:14,745 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 26 [2020-07-20 17:15:14,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:15:14,745 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2020-07-20 17:15:14,745 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 17:15:14,746 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2020-07-20 17:15:14,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-07-20 17:15:14,747 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:15:14,747 INFO L422 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:15:14,963 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:15:14,963 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:15:14,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:15:14,965 INFO L82 PathProgramCache]: Analyzing trace with hash 2095306073, now seen corresponding path program 3 times [2020-07-20 17:15:14,966 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:15:14,966 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2014106168] [2020-07-20 17:15:14,967 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:15:15,058 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:15:15,058 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:15:15,059 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 17:15:15,062 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:15:15,077 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2020-07-20 17:15:15,078 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:15:15,078 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2014106168] [2020-07-20 17:15:15,078 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:15:15,078 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:15:15,079 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [959829579] [2020-07-20 17:15:15,079 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:15:15,079 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:15:15,080 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:15:15,080 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:15:15,080 INFO L87 Difference]: Start difference. First operand 40 states and 41 transitions. Second operand 3 states. [2020-07-20 17:15:15,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:15:15,100 INFO L93 Difference]: Finished difference Result 74 states and 76 transitions. [2020-07-20 17:15:15,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:15:15,102 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 38 [2020-07-20 17:15:15,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:15:15,103 INFO L225 Difference]: With dead ends: 74 [2020-07-20 17:15:15,103 INFO L226 Difference]: Without dead ends: 42 [2020-07-20 17:15:15,104 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:15:15,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-20 17:15:15,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-07-20 17:15:15,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-20 17:15:15,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2020-07-20 17:15:15,112 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 38 [2020-07-20 17:15:15,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:15:15,113 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2020-07-20 17:15:15,113 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:15:15,113 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2020-07-20 17:15:15,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-20 17:15:15,115 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:15:15,115 INFO L422 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:15:15,328 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:15:15,329 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:15:15,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:15:15,330 INFO L82 PathProgramCache]: Analyzing trace with hash -900956101, now seen corresponding path program 1 times [2020-07-20 17:15:15,330 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:15:15,330 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [168178142] [2020-07-20 17:15:15,330 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:15:15,426 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:15:15,427 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:15:15,428 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:15:15,431 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:15:15,448 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2020-07-20 17:15:15,448 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:15:15,490 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2020-07-20 17:15:15,491 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [168178142] [2020-07-20 17:15:15,491 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:15:15,491 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-07-20 17:15:15,491 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [86800532] [2020-07-20 17:15:15,492 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 17:15:15,493 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:15:15,494 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 17:15:15,494 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-20 17:15:15,494 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand 6 states. [2020-07-20 17:15:15,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:15:15,548 INFO L93 Difference]: Finished difference Result 79 states and 83 transitions. [2020-07-20 17:15:15,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 17:15:15,549 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 40 [2020-07-20 17:15:15,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:15:15,550 INFO L225 Difference]: With dead ends: 79 [2020-07-20 17:15:15,550 INFO L226 Difference]: Without dead ends: 47 [2020-07-20 17:15:15,551 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-20 17:15:15,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-20 17:15:15,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-07-20 17:15:15,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-07-20 17:15:15,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2020-07-20 17:15:15,559 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 40 [2020-07-20 17:15:15,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:15:15,560 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2020-07-20 17:15:15,560 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 17:15:15,560 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2020-07-20 17:15:15,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-07-20 17:15:15,561 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:15:15,561 INFO L422 BasicCegarLoop]: trace histogram [11, 10, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:15:15,769 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:15:15,770 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:15:15,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:15:15,770 INFO L82 PathProgramCache]: Analyzing trace with hash 1470881249, now seen corresponding path program 2 times [2020-07-20 17:15:15,771 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:15:15,771 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [828513048] [2020-07-20 17:15:15,772 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 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 [2020-07-20 17:15:16,663 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:15:16,664 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:15:16,669 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 17:15:16,672 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:15:16,712 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2020-07-20 17:15:16,712 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:15:16,786 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2020-07-20 17:15:16,786 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [828513048] [2020-07-20 17:15:16,787 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:15:16,787 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-20 17:15:16,787 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1711998872] [2020-07-20 17:15:16,788 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 17:15:16,788 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:15:16,788 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 17:15:16,789 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-07-20 17:15:16,789 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand 12 states. [2020-07-20 17:15:16,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:15:16,868 INFO L93 Difference]: Finished difference Result 91 states and 98 transitions. [2020-07-20 17:15:16,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 17:15:16,873 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 46 [2020-07-20 17:15:16,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:15:16,875 INFO L225 Difference]: With dead ends: 91 [2020-07-20 17:15:16,875 INFO L226 Difference]: Without dead ends: 59 [2020-07-20 17:15:16,876 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-07-20 17:15:16,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-07-20 17:15:16,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2020-07-20 17:15:16,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-07-20 17:15:16,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2020-07-20 17:15:16,885 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 46 [2020-07-20 17:15:16,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:15:16,885 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2020-07-20 17:15:16,885 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 17:15:16,885 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2020-07-20 17:15:16,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-07-20 17:15:16,887 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:15:16,887 INFO L422 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:15:17,096 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:15:17,097 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:15:17,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:15:17,098 INFO L82 PathProgramCache]: Analyzing trace with hash -875693139, now seen corresponding path program 3 times [2020-07-20 17:15:17,098 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:15:17,099 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [239935156] [2020-07-20 17:15:17,099 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 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