/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_FUNCTIONS --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/loop-lit/hhk2008.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 14:33:48,983 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 14:33:48,987 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 14:33:49,000 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 14:33:49,001 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 14:33:49,002 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 14:33:49,003 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 14:33:49,005 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 14:33:49,007 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 14:33:49,008 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 14:33:49,009 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 14:33:49,010 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 14:33:49,011 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 14:33:49,012 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 14:33:49,013 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 14:33:49,014 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 14:33:49,015 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 14:33:49,016 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 14:33:49,017 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 14:33:49,019 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 14:33:49,021 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 14:33:49,022 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 14:33:49,023 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 14:33:49,024 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 14:33:49,027 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 14:33:49,035 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 14:33:49,036 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 14:33:49,036 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 14:33:49,037 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 14:33:49,053 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 14:33:49,053 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 14:33:49,054 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 14:33:49,055 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 14:33:49,055 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 14:33:49,055 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 14:33:49,055 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 14:33:49,055 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 14:33:49,056 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 14:33:49,056 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 14:33:49,056 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 14:33:49,056 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 14:33:49,056 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 14:33:49,057 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 14:33:49,057 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 14:33:49,057 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 14:33:49,057 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 14:33:49,057 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 14:33:49,058 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 14:33:49,058 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 14:33:49,058 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 14:33:49,058 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 14:33:49,059 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 14:33:49,059 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 14:33:49,059 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 14:33:49,059 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 14:33:49,059 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:33:49,060 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 14:33:49,060 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 14:33:49,060 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_FUNCTIONS 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 14:33:49,385 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 14:33:49,402 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 14:33:49,406 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 14:33:49,408 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 14:33:49,408 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 14:33:49,409 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/hhk2008.i [2020-07-20 14:33:49,483 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7650e4b99/7db4f4dcab094ba1a1d284992e12bf2d/FLAG304c9c597 [2020-07-20 14:33:49,951 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 14:33:49,952 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-lit/hhk2008.i [2020-07-20 14:33:49,958 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7650e4b99/7db4f4dcab094ba1a1d284992e12bf2d/FLAG304c9c597 [2020-07-20 14:33:50,307 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7650e4b99/7db4f4dcab094ba1a1d284992e12bf2d [2020-07-20 14:33:50,316 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 14:33:50,319 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 14:33:50,321 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 14:33:50,321 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 14:33:50,325 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 14:33:50,326 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 02:33:50" (1/1) ... [2020-07-20 14:33:50,329 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5d707ba9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:33:50, skipping insertion in model container [2020-07-20 14:33:50,329 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 02:33:50" (1/1) ... [2020-07-20 14:33:50,337 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 14:33:50,356 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 14:33:50,521 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 14:33:50,526 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 14:33:50,545 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 14:33:50,561 INFO L208 MainTranslator]: Completed translation [2020-07-20 14:33:50,562 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:33:50 WrapperNode [2020-07-20 14:33:50,562 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 14:33:50,563 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 14:33:50,564 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 14:33:50,564 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 14:33:50,579 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:33:50" (1/1) ... [2020-07-20 14:33:50,580 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:33:50" (1/1) ... [2020-07-20 14:33:50,586 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:33:50" (1/1) ... [2020-07-20 14:33:50,586 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:33:50" (1/1) ... [2020-07-20 14:33:50,590 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:33:50" (1/1) ... [2020-07-20 14:33:50,595 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:33:50" (1/1) ... [2020-07-20 14:33:50,596 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:33:50" (1/1) ... [2020-07-20 14:33:50,691 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 14:33:50,691 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 14:33:50,691 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 14:33:50,692 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 14:33:50,693 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:33:50" (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 14:33:50,763 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 14:33:50,764 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 14:33:50,764 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 14:33:50,764 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 14:33:50,765 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 14:33:50,765 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 14:33:50,766 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 14:33:50,767 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 14:33:50,767 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 14:33:50,767 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 14:33:50,768 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 14:33:50,768 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 14:33:50,768 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 14:33:50,963 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 14:33:50,964 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 14:33:50,968 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 02:33:50 BoogieIcfgContainer [2020-07-20 14:33:50,968 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 14:33:50,970 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 14:33:50,970 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 14:33:50,973 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 14:33:50,974 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 02:33:50" (1/3) ... [2020-07-20 14:33:50,975 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@41babc1d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 02:33:50, skipping insertion in model container [2020-07-20 14:33:50,975 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:33:50" (2/3) ... [2020-07-20 14:33:50,975 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@41babc1d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 02:33:50, skipping insertion in model container [2020-07-20 14:33:50,975 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 02:33:50" (3/3) ... [2020-07-20 14:33:50,977 INFO L109 eAbstractionObserver]: Analyzing ICFG hhk2008.i [2020-07-20 14:33:50,989 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 14:33:50,997 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 14:33:51,013 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 14:33:51,043 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 14:33:51,043 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 14:33:51,044 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 14:33:51,044 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 14:33:51,044 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 14:33:51,044 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 14:33:51,044 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 14:33:51,044 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 14:33:51,072 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-20 14:33:51,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-07-20 14:33:51,081 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:33:51,082 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:33:51,083 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:33:51,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:33:51,092 INFO L82 PathProgramCache]: Analyzing trace with hash -677001103, now seen corresponding path program 1 times [2020-07-20 14:33:51,104 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:33:51,105 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1674832541] [2020-07-20 14:33:51,106 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 14:33:51,216 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:33:51,216 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:33:51,220 INFO L263 TraceCheckSpWp]: Trace formula consists of 35 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 14:33:51,226 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:33:51,346 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-20 14:33:51,396 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 14:33:51,396 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 14:33:51,397 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1674832541] [2020-07-20 14:33:51,398 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 14:33:51,398 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-20 14:33:51,399 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1266237934] [2020-07-20 14:33:51,405 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 14:33:51,405 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:33:51,419 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 14:33:51,420 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-20 14:33:51,422 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 6 states. [2020-07-20 14:33:51,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:33:51,572 INFO L93 Difference]: Finished difference Result 41 states and 50 transitions. [2020-07-20 14:33:51,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 14:33:51,575 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 12 [2020-07-20 14:33:51,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:33:51,586 INFO L225 Difference]: With dead ends: 41 [2020-07-20 14:33:51,586 INFO L226 Difference]: Without dead ends: 14 [2020-07-20 14:33:51,592 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-07-20 14:33:51,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-07-20 14:33:51,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-07-20 14:33:51,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-07-20 14:33:51,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-07-20 14:33:51,642 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-07-20 14:33:51,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:33:51,642 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-07-20 14:33:51,643 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 14:33:51,643 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-07-20 14:33:51,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 14:33:51,644 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:33:51,644 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:33:51,859 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:33:51,859 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:33:51,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:33:51,860 INFO L82 PathProgramCache]: Analyzing trace with hash 523340046, now seen corresponding path program 1 times [2020-07-20 14:33:51,860 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:33:51,861 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2024462974] [2020-07-20 14:33:51,861 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 14:33:51,899 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:33:51,900 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:33:51,902 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 14:33:51,904 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:33:51,979 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-20 14:33:52,026 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:33:52,027 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:33:52,060 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:33:52,136 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:33:52,137 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2024462974] [2020-07-20 14:33:52,137 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:33:52,137 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 14:33:52,137 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [640731808] [2020-07-20 14:33:52,139 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 14:33:52,140 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:33:52,140 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 14:33:52,141 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 14:33:52,141 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 10 states. [2020-07-20 14:33:52,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:33:52,365 INFO L93 Difference]: Finished difference Result 22 states and 23 transitions. [2020-07-20 14:33:52,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 14:33:52,366 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 13 [2020-07-20 14:33:52,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:33:52,368 INFO L225 Difference]: With dead ends: 22 [2020-07-20 14:33:52,368 INFO L226 Difference]: Without dead ends: 16 [2020-07-20 14:33:52,370 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2020-07-20 14:33:52,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-07-20 14:33:52,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-07-20 14:33:52,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-07-20 14:33:52,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-07-20 14:33:52,376 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 13 [2020-07-20 14:33:52,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:33:52,376 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-07-20 14:33:52,376 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 14:33:52,376 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-07-20 14:33:52,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-20 14:33:52,377 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:33:52,378 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:33:52,592 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:33:52,593 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:33:52,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:33:52,594 INFO L82 PathProgramCache]: Analyzing trace with hash 1555818862, now seen corresponding path program 2 times [2020-07-20 14:33:52,595 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:33:52,595 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [681741363] [2020-07-20 14:33:52,595 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 14:33:52,630 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:33:52,631 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:33:52,632 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 14:33:52,634 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:33:52,723 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-20 14:33:52,755 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:33:52,755 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:33:52,783 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:33:52,906 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:33:52,907 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [681741363] [2020-07-20 14:33:52,907 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:33:52,907 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 14 [2020-07-20 14:33:52,908 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1574312092] [2020-07-20 14:33:52,908 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 14:33:52,909 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:33:52,909 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 14:33:52,909 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 14:33:52,910 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 14 states. [2020-07-20 14:33:53,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:33:53,363 INFO L93 Difference]: Finished difference Result 26 states and 29 transitions. [2020-07-20 14:33:53,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 14:33:53,364 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 15 [2020-07-20 14:33:53,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:33:53,365 INFO L225 Difference]: With dead ends: 26 [2020-07-20 14:33:53,365 INFO L226 Difference]: Without dead ends: 20 [2020-07-20 14:33:53,366 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=124, Invalid=428, Unknown=0, NotChecked=0, Total=552 [2020-07-20 14:33:53,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-07-20 14:33:53,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-07-20 14:33:53,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-07-20 14:33:53,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-07-20 14:33:53,374 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 15 [2020-07-20 14:33:53,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:33:53,374 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-07-20 14:33:53,374 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 14:33:53,375 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-07-20 14:33:53,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 14:33:53,375 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:33:53,376 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:33:53,589 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:33:53,590 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:33:53,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:33:53,591 INFO L82 PathProgramCache]: Analyzing trace with hash 399696430, now seen corresponding path program 3 times [2020-07-20 14:33:53,592 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:33:53,592 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1229363850] [2020-07-20 14:33:53,593 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 14:33:53,628 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:33:53,628 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:33:53,630 WARN L261 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 36 conjunts are in the unsatisfiable core [2020-07-20 14:33:53,632 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:33:53,811 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-20 14:33:53,865 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:33:53,866 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:33:53,913 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:33:54,245 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:33:54,246 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1229363850] [2020-07-20 14:33:54,246 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:33:54,246 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 22 [2020-07-20 14:33:54,246 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [416774383] [2020-07-20 14:33:54,247 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 14:33:54,247 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:33:54,247 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 14:33:54,249 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=368, Unknown=0, NotChecked=0, Total=462 [2020-07-20 14:33:54,249 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 22 states. [2020-07-20 14:33:55,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:33:55,439 INFO L93 Difference]: Finished difference Result 34 states and 41 transitions. [2020-07-20 14:33:55,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-20 14:33:55,440 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 19 [2020-07-20 14:33:55,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:33:55,441 INFO L225 Difference]: With dead ends: 34 [2020-07-20 14:33:55,442 INFO L226 Difference]: Without dead ends: 28 [2020-07-20 14:33:55,443 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=352, Invalid=1208, Unknown=0, NotChecked=0, Total=1560 [2020-07-20 14:33:55,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-20 14:33:55,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-07-20 14:33:55,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-20 14:33:55,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-07-20 14:33:55,450 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 19 [2020-07-20 14:33:55,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:33:55,451 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-07-20 14:33:55,451 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 14:33:55,451 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-07-20 14:33:55,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 14:33:55,452 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:33:55,452 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:33:55,659 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:33:55,661 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:33:55,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:33:55,662 INFO L82 PathProgramCache]: Analyzing trace with hash -852380754, now seen corresponding path program 4 times [2020-07-20 14:33:55,662 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:33:55,663 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [841365765] [2020-07-20 14:33:55,664 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 14:33:55,697 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:33:55,698 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:33:55,699 WARN L261 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 68 conjunts are in the unsatisfiable core [2020-07-20 14:33:55,702 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:33:56,022 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-20 14:33:56,079 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:33:56,079 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:33:56,138 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:33:56,993 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:33:56,994 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [841365765] [2020-07-20 14:33:56,994 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:33:56,995 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 38 [2020-07-20 14:33:56,995 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2022520026] [2020-07-20 14:33:56,995 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-07-20 14:33:56,996 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:33:56,996 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-07-20 14:33:56,997 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=302, Invalid=1104, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 14:33:56,997 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 38 states. [2020-07-20 14:33:57,952 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 102 [2020-07-20 14:33:58,213 WARN L193 SmtUtils]: Spent 202.00 ms on a formula simplification. DAG size of input: 103 DAG size of output: 72 [2020-07-20 14:33:58,437 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2020-07-20 14:33:58,666 WARN L193 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 98 DAG size of output: 68 [2020-07-20 14:34:00,895 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2020-07-20 14:34:00,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:34:00,910 INFO L93 Difference]: Finished difference Result 50 states and 65 transitions. [2020-07-20 14:34:00,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-07-20 14:34:00,911 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 27 [2020-07-20 14:34:00,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:34:00,913 INFO L225 Difference]: With dead ends: 50 [2020-07-20 14:34:00,913 INFO L226 Difference]: Without dead ends: 44 [2020-07-20 14:34:00,916 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 632 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=1192, Invalid=3920, Unknown=0, NotChecked=0, Total=5112 [2020-07-20 14:34:00,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-07-20 14:34:00,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-07-20 14:34:00,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-07-20 14:34:00,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-07-20 14:34:00,928 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 27 [2020-07-20 14:34:00,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:34:00,929 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-07-20 14:34:00,929 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-07-20 14:34:00,929 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-07-20 14:34:00,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-07-20 14:34:00,930 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:34:00,931 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:34:01,136 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:34:01,137 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:34:01,138 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:34:01,138 INFO L82 PathProgramCache]: Analyzing trace with hash -2114791762, now seen corresponding path program 5 times [2020-07-20 14:34:01,139 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:34:01,139 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [934281433] [2020-07-20 14:34:01,140 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 14:34:01,196 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:34:01,197 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:34:01,201 WARN L261 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 132 conjunts are in the unsatisfiable core [2020-07-20 14:34:01,204 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:34:02,270 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-20 14:34:02,394 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:34:02,395 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:34:02,498 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:34:05,614 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:34:05,615 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [934281433] [2020-07-20 14:34:05,615 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:34:05,615 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37] total 70 [2020-07-20 14:34:05,616 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [795813762] [2020-07-20 14:34:05,616 INFO L459 AbstractCegarLoop]: Interpolant automaton has 70 states [2020-07-20 14:34:05,616 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:34:05,617 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2020-07-20 14:34:05,619 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1102, Invalid=3728, Unknown=0, NotChecked=0, Total=4830 [2020-07-20 14:34:05,619 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 70 states. [2020-07-20 14:34:08,442 WARN L193 SmtUtils]: Spent 330.00 ms on a formula simplification that was a NOOP. DAG size: 198 [2020-07-20 14:34:09,083 WARN L193 SmtUtils]: Spent 483.00 ms on a formula simplification. DAG size of input: 199 DAG size of output: 136 [2020-07-20 14:34:09,723 WARN L193 SmtUtils]: Spent 295.00 ms on a formula simplification that was a NOOP. DAG size: 190 [2020-07-20 14:34:10,302 WARN L193 SmtUtils]: Spent 459.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 132 [2020-07-20 14:34:10,924 WARN L193 SmtUtils]: Spent 287.00 ms on a formula simplification that was a NOOP. DAG size: 184 [2020-07-20 14:34:11,589 WARN L193 SmtUtils]: Spent 273.00 ms on a formula simplification that was a NOOP. DAG size: 178 [2020-07-20 14:34:12,157 WARN L193 SmtUtils]: Spent 255.00 ms on a formula simplification that was a NOOP. DAG size: 172 [2020-07-20 14:34:12,805 WARN L193 SmtUtils]: Spent 287.00 ms on a formula simplification that was a NOOP. DAG size: 166 [2020-07-20 14:34:13,375 WARN L193 SmtUtils]: Spent 240.00 ms on a formula simplification that was a NOOP. DAG size: 160 [2020-07-20 14:34:13,895 WARN L193 SmtUtils]: Spent 230.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2020-07-20 14:34:14,403 WARN L193 SmtUtils]: Spent 213.00 ms on a formula simplification that was a NOOP. DAG size: 148 [2020-07-20 14:34:14,912 WARN L193 SmtUtils]: Spent 209.00 ms on a formula simplification that was a NOOP. DAG size: 142 [2020-07-20 14:34:15,536 WARN L193 SmtUtils]: Spent 218.00 ms on a formula simplification that was a NOOP. DAG size: 136 [2020-07-20 14:34:15,997 WARN L193 SmtUtils]: Spent 177.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2020-07-20 14:34:16,449 WARN L193 SmtUtils]: Spent 169.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2020-07-20 14:34:16,906 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 118 [2020-07-20 14:34:17,336 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 112 [2020-07-20 14:34:17,752 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 106 [2020-07-20 14:34:18,148 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 100 [2020-07-20 14:34:18,529 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2020-07-20 14:34:18,909 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2020-07-20 14:34:19,261 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-20 14:34:22,993 WARN L193 SmtUtils]: Spent 305.00 ms on a formula simplification that was a NOOP. DAG size: 193 [2020-07-20 14:34:23,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:34:23,004 INFO L93 Difference]: Finished difference Result 82 states and 113 transitions. [2020-07-20 14:34:23,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2020-07-20 14:34:23,005 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 43 [2020-07-20 14:34:23,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:34:23,007 INFO L225 Difference]: With dead ends: 82 [2020-07-20 14:34:23,007 INFO L226 Difference]: Without dead ends: 76 [2020-07-20 14:34:23,012 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2296 ImplicationChecksByTransitivity, 19.9s TimeCoverageRelationStatistics Valid=4408, Invalid=13952, Unknown=0, NotChecked=0, Total=18360 [2020-07-20 14:34:23,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-07-20 14:34:23,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2020-07-20 14:34:23,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-20 14:34:23,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 76 transitions. [2020-07-20 14:34:23,034 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 76 transitions. Word has length 43 [2020-07-20 14:34:23,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:34:23,035 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 76 transitions. [2020-07-20 14:34:23,035 INFO L480 AbstractCegarLoop]: Interpolant automaton has 70 states. [2020-07-20 14:34:23,035 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 76 transitions. [2020-07-20 14:34:23,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-07-20 14:34:23,037 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:34:23,038 INFO L422 BasicCegarLoop]: trace histogram [63, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:34:23,250 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:34:23,251 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:34:23,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:34:23,252 INFO L82 PathProgramCache]: Analyzing trace with hash -1115480914, now seen corresponding path program 6 times [2020-07-20 14:34:23,252 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:34:23,253 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1828381050] [2020-07-20 14:34:23,253 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 14:34:23,335 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:34:23,335 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:34:23,342 WARN L261 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 260 conjunts are in the unsatisfiable core [2020-07-20 14:34:23,347 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:34:27,326 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-20 14:34:27,562 INFO L134 CoverageAnalysis]: Checked inductivity of 2016 backedges. 0 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:34:27,563 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:34:27,785 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:34:41,695 INFO L134 CoverageAnalysis]: Checked inductivity of 2016 backedges. 0 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:34:41,696 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1828381050] [2020-07-20 14:34:41,696 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:34:41,698 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69] total 134 [2020-07-20 14:34:41,698 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [496455089] [2020-07-20 14:34:41,704 INFO L459 AbstractCegarLoop]: Interpolant automaton has 134 states [2020-07-20 14:34:41,704 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:34:41,706 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 134 interpolants. [2020-07-20 14:34:41,712 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4238, Invalid=13584, Unknown=0, NotChecked=0, Total=17822 [2020-07-20 14:34:41,712 INFO L87 Difference]: Start difference. First operand 76 states and 76 transitions. Second operand 134 states. [2020-07-20 14:34:52,997 WARN L193 SmtUtils]: Spent 954.00 ms on a formula simplification that was a NOOP. DAG size: 390 [2020-07-20 14:34:54,791 WARN L193 SmtUtils]: Spent 1.35 s on a formula simplification. DAG size of input: 391 DAG size of output: 264 [2020-07-20 14:34:57,698 WARN L193 SmtUtils]: Spent 1.11 s on a formula simplification that was a NOOP. DAG size: 382 [2020-07-20 14:34:59,393 WARN L193 SmtUtils]: Spent 1.34 s on a formula simplification. DAG size of input: 386 DAG size of output: 260 [2020-07-20 14:35:02,191 WARN L193 SmtUtils]: Spent 1.08 s on a formula simplification that was a NOOP. DAG size: 376 [2020-07-20 14:35:05,317 WARN L193 SmtUtils]: Spent 1.13 s on a formula simplification that was a NOOP. DAG size: 370 [2020-07-20 14:35:08,104 WARN L193 SmtUtils]: Spent 1.12 s on a formula simplification that was a NOOP. DAG size: 364 [2020-07-20 14:35:10,950 WARN L193 SmtUtils]: Spent 1.09 s on a formula simplification that was a NOOP. DAG size: 358 [2020-07-20 14:35:13,823 WARN L193 SmtUtils]: Spent 1.07 s on a formula simplification that was a NOOP. DAG size: 352 [2020-07-20 14:35:16,480 WARN L193 SmtUtils]: Spent 957.00 ms on a formula simplification that was a NOOP. DAG size: 346 [2020-07-20 14:35:19,086 WARN L193 SmtUtils]: Spent 927.00 ms on a formula simplification that was a NOOP. DAG size: 340 [2020-07-20 14:35:21,690 WARN L193 SmtUtils]: Spent 907.00 ms on a formula simplification that was a NOOP. DAG size: 334 [2020-07-20 14:35:24,233 WARN L193 SmtUtils]: Spent 880.00 ms on a formula simplification that was a NOOP. DAG size: 328 [2020-07-20 14:35:26,787 WARN L193 SmtUtils]: Spent 863.00 ms on a formula simplification that was a NOOP. DAG size: 322 [2020-07-20 14:35:29,449 WARN L193 SmtUtils]: Spent 938.00 ms on a formula simplification that was a NOOP. DAG size: 316 [2020-07-20 14:35:32,066 WARN L193 SmtUtils]: Spent 894.00 ms on a formula simplification that was a NOOP. DAG size: 310 [2020-07-20 14:35:34,795 WARN L193 SmtUtils]: Spent 914.00 ms on a formula simplification that was a NOOP. DAG size: 304 [2020-07-20 14:35:37,397 WARN L193 SmtUtils]: Spent 854.00 ms on a formula simplification that was a NOOP. DAG size: 298 [2020-07-20 14:35:40,131 WARN L193 SmtUtils]: Spent 904.00 ms on a formula simplification that was a NOOP. DAG size: 292 [2020-07-20 14:35:42,941 WARN L193 SmtUtils]: Spent 908.00 ms on a formula simplification that was a NOOP. DAG size: 286 [2020-07-20 14:35:45,640 WARN L193 SmtUtils]: Spent 842.00 ms on a formula simplification that was a NOOP. DAG size: 280 [2020-07-20 14:35:48,325 WARN L193 SmtUtils]: Spent 857.00 ms on a formula simplification that was a NOOP. DAG size: 274 [2020-07-20 14:35:50,974 WARN L193 SmtUtils]: Spent 835.00 ms on a formula simplification that was a NOOP. DAG size: 268 [2020-07-20 14:35:53,605 WARN L193 SmtUtils]: Spent 828.00 ms on a formula simplification that was a NOOP. DAG size: 262 [2020-07-20 14:35:56,314 WARN L193 SmtUtils]: Spent 799.00 ms on a formula simplification that was a NOOP. DAG size: 256 [2020-07-20 14:35:58,976 WARN L193 SmtUtils]: Spent 778.00 ms on a formula simplification that was a NOOP. DAG size: 250 [2020-07-20 14:36:01,740 WARN L193 SmtUtils]: Spent 808.00 ms on a formula simplification that was a NOOP. DAG size: 244 [2020-07-20 14:36:04,459 WARN L193 SmtUtils]: Spent 798.00 ms on a formula simplification that was a NOOP. DAG size: 238 [2020-07-20 14:36:07,180 WARN L193 SmtUtils]: Spent 786.00 ms on a formula simplification that was a NOOP. DAG size: 232 [2020-07-20 14:36:09,907 WARN L193 SmtUtils]: Spent 797.00 ms on a formula simplification that was a NOOP. DAG size: 226 [2020-07-20 14:36:12,664 WARN L193 SmtUtils]: Spent 768.00 ms on a formula simplification that was a NOOP. DAG size: 220 [2020-07-20 14:36:15,473 WARN L193 SmtUtils]: Spent 767.00 ms on a formula simplification that was a NOOP. DAG size: 214 [2020-07-20 14:36:18,271 WARN L193 SmtUtils]: Spent 727.00 ms on a formula simplification that was a NOOP. DAG size: 208 [2020-07-20 14:36:21,035 WARN L193 SmtUtils]: Spent 736.00 ms on a formula simplification that was a NOOP. DAG size: 202 [2020-07-20 14:36:23,777 WARN L193 SmtUtils]: Spent 742.00 ms on a formula simplification that was a NOOP. DAG size: 196 [2020-07-20 14:36:26,557 WARN L193 SmtUtils]: Spent 757.00 ms on a formula simplification that was a NOOP. DAG size: 190 [2020-07-20 14:36:29,400 WARN L193 SmtUtils]: Spent 709.00 ms on a formula simplification that was a NOOP. DAG size: 184 [2020-07-20 14:36:32,280 WARN L193 SmtUtils]: Spent 722.00 ms on a formula simplification that was a NOOP. DAG size: 178 [2020-07-20 14:36:35,029 WARN L193 SmtUtils]: Spent 678.00 ms on a formula simplification that was a NOOP. DAG size: 172 [2020-07-20 14:36:37,596 WARN L193 SmtUtils]: Spent 669.00 ms on a formula simplification that was a NOOP. DAG size: 166 [2020-07-20 14:36:40,372 WARN L193 SmtUtils]: Spent 651.00 ms on a formula simplification that was a NOOP. DAG size: 160 [2020-07-20 14:36:43,042 WARN L193 SmtUtils]: Spent 629.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2020-07-20 14:36:45,734 WARN L193 SmtUtils]: Spent 614.00 ms on a formula simplification that was a NOOP. DAG size: 148 [2020-07-20 14:36:48,351 WARN L193 SmtUtils]: Spent 565.00 ms on a formula simplification that was a NOOP. DAG size: 142 [2020-07-20 14:36:50,890 WARN L193 SmtUtils]: Spent 591.00 ms on a formula simplification that was a NOOP. DAG size: 136 [2020-07-20 14:36:53,673 WARN L193 SmtUtils]: Spent 620.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2020-07-20 14:36:56,470 WARN L193 SmtUtils]: Spent 589.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2020-07-20 14:36:59,229 WARN L193 SmtUtils]: Spent 550.00 ms on a formula simplification that was a NOOP. DAG size: 118 [2020-07-20 14:37:01,887 WARN L193 SmtUtils]: Spent 521.00 ms on a formula simplification that was a NOOP. DAG size: 112 [2020-07-20 14:37:04,399 WARN L193 SmtUtils]: Spent 504.00 ms on a formula simplification that was a NOOP. DAG size: 106 [2020-07-20 14:37:06,942 WARN L193 SmtUtils]: Spent 472.00 ms on a formula simplification that was a NOOP. DAG size: 100 [2020-07-20 14:37:09,438 WARN L193 SmtUtils]: Spent 446.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2020-07-20 14:37:11,938 WARN L193 SmtUtils]: Spent 488.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2020-07-20 14:37:14,254 WARN L193 SmtUtils]: Spent 390.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-20 14:37:16,441 WARN L193 SmtUtils]: Spent 361.00 ms on a formula simplification that was a NOOP. DAG size: 76 [2020-07-20 14:37:18,455 WARN L193 SmtUtils]: Spent 322.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 14:37:20,512 WARN L193 SmtUtils]: Spent 337.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 14:37:22,449 WARN L193 SmtUtils]: Spent 278.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 14:37:24,262 WARN L193 SmtUtils]: Spent 245.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-20 14:37:25,815 WARN L193 SmtUtils]: Spent 204.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 14:37:27,223 WARN L193 SmtUtils]: Spent 165.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 14:37:28,517 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-20 14:37:29,657 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2020-07-20 14:37:42,562 WARN L193 SmtUtils]: Spent 2.94 s on a formula simplification that was a NOOP. DAG size: 385 [2020-07-20 14:37:42,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:37:42,590 INFO L93 Difference]: Finished difference Result 146 states and 209 transitions. [2020-07-20 14:37:42,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 134 states. [2020-07-20 14:37:42,595 INFO L78 Accepts]: Start accepts. Automaton has 134 states. Word has length 75 [2020-07-20 14:37:42,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:37:42,598 INFO L225 Difference]: With dead ends: 146 [2020-07-20 14:37:42,598 INFO L226 Difference]: Without dead ends: 140 [2020-07-20 14:37:42,609 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 262 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8696 ImplicationChecksByTransitivity, 190.7s TimeCoverageRelationStatistics Valid=16984, Invalid=52448, Unknown=0, NotChecked=0, Total=69432 [2020-07-20 14:37:42,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2020-07-20 14:37:42,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 140. [2020-07-20 14:37:42,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2020-07-20 14:37:42,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 140 transitions. [2020-07-20 14:37:42,676 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 140 transitions. Word has length 75 [2020-07-20 14:37:42,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:37:42,677 INFO L479 AbstractCegarLoop]: Abstraction has 140 states and 140 transitions. [2020-07-20 14:37:42,677 INFO L480 AbstractCegarLoop]: Interpolant automaton has 134 states. [2020-07-20 14:37:42,677 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 140 transitions. [2020-07-20 14:37:42,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2020-07-20 14:37:42,683 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:37:42,683 INFO L422 BasicCegarLoop]: trace histogram [127, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:37:42,884 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:37:42,885 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:37:42,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:37:42,886 INFO L82 PathProgramCache]: Analyzing trace with hash -858019666, now seen corresponding path program 7 times [2020-07-20 14:37:42,886 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:37:42,887 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2020121652] [2020-07-20 14:37:42,887 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 [2020-07-20 14:37:43,039 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:37:43,039 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:37:43,055 WARN L261 TraceCheckSpWp]: Trace formula consists of 670 conjuncts, 516 conjunts are in the unsatisfiable core [2020-07-20 14:37:43,065 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:38:26,383 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-20 14:38:28,144 INFO L134 CoverageAnalysis]: Checked inductivity of 8128 backedges. 0 proven. 8128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:38:28,144 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:38:29,871 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:42:33,862 INFO L134 CoverageAnalysis]: Checked inductivity of 8128 backedges. 0 proven. 8128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:42:33,863 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2020121652] [2020-07-20 14:42:33,864 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:42:33,864 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [133, 133] total 262 [2020-07-20 14:42:33,864 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2005437085] [2020-07-20 14:42:33,866 INFO L459 AbstractCegarLoop]: Interpolant automaton has 262 states [2020-07-20 14:42:33,866 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:42:33,870 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 262 interpolants. [2020-07-20 14:42:33,878 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16654, Invalid=51728, Unknown=0, NotChecked=0, Total=68382 [2020-07-20 14:42:33,879 INFO L87 Difference]: Start difference. First operand 140 states and 140 transitions. Second operand 262 states. [2020-07-20 14:43:51,013 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 14:44:09,066 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 14:44:18,358 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 14:44:20,717 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 14:44:28,904 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 14:44:33,535 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 14:44:35,812 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 14:44:38,072 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 14:44:40,326 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 14:44:42,621 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 14:44:44,891 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 14:44:47,182 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 14:44:51,761 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 14:44:54,073 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 14:45:16,187 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 14:45:20,823 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 14:45:23,133 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 14:45:29,844 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 14:45:34,500 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 14:45:36,850 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 14:45:39,184 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 14:45:43,868 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 14:45:59,146 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 14:46:01,431 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 14:46:03,776 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 14:46:06,100 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 14:46:10,757 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 14:46:17,765 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 14:46:20,123 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 14:46:24,859 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 14:46:27,084 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 14:46:37,944 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 14:46:40,205 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 14:46:42,615 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 14:46:44,953 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 14:46:49,742 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 14:46:52,174 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 14:46:54,605 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 14:46:56,911 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 14:47:01,639 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 14:47:04,099 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 14:47:06,562 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 14:47:09,025 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 14:47:11,487 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 14:47:18,204 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 14:47:20,530 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 14:47:22,993 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 14:47:41,751 WARN L193 SmtUtils]: Spent 14.63 s on a formula simplification that was a NOOP. DAG size: 774 [2020-07-20 14:48:04,119 WARN L193 SmtUtils]: Spent 18.19 s on a formula simplification. DAG size of input: 775 DAG size of output: 520