/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/hhk2008.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 16:59:49,821 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 16:59:49,827 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 16:59:49,858 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 16:59:49,858 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 16:59:49,861 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 16:59:49,865 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 16:59:49,882 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 16:59:49,886 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 16:59:49,889 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 16:59:49,891 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 16:59:49,894 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 16:59:49,894 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 16:59:49,900 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 16:59:49,904 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 16:59:49,907 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 16:59:49,911 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 16:59:49,914 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 16:59:49,917 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 16:59:49,924 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 16:59:49,930 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 16:59:49,932 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 16:59:49,934 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 16:59:49,935 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 16:59:49,938 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 16:59:49,950 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 16:59:49,951 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 16:59:49,952 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 16:59:49,953 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 16:59:49,973 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 16:59:49,974 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 16:59:49,975 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 16:59:49,976 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 16:59:49,976 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 16:59:49,976 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 16:59:49,977 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 16:59:49,977 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 16:59:49,977 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 16:59:49,977 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 16:59:49,978 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 16:59:49,978 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 16:59:49,978 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 16:59:49,979 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 16:59:49,979 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 16:59:49,979 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 16:59:49,979 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 16:59:49,979 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 16:59:49,980 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 16:59:49,980 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 16:59:49,980 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 16:59:49,980 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:59:49,981 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 16:59:49,981 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 16:59:49,981 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 16:59:49,982 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 16:59:49,982 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:59:49,982 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 16:59:49,982 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 16:59:49,983 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 16:59:50,423 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 16:59:50,454 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 16:59:50,462 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 16:59:50,464 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 16:59:50,465 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 16:59:50,468 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/hhk2008.i [2020-07-21 16:59:50,592 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/79586def2/861b16af1c964c42bee05c5d4a79a686/FLAG60d5d1902 [2020-07-21 16:59:51,243 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 16:59:51,244 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-lit/hhk2008.i [2020-07-21 16:59:51,252 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/79586def2/861b16af1c964c42bee05c5d4a79a686/FLAG60d5d1902 [2020-07-21 16:59:51,604 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/79586def2/861b16af1c964c42bee05c5d4a79a686 [2020-07-21 16:59:51,616 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 16:59:51,620 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 16:59:51,621 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 16:59:51,622 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 16:59:51,627 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 16:59:51,629 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:59:51" (1/1) ... [2020-07-21 16:59:51,634 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@775218 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:59:51, skipping insertion in model container [2020-07-21 16:59:51,634 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:59:51" (1/1) ... [2020-07-21 16:59:51,646 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 16:59:51,680 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 16:59:51,884 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:59:51,891 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 16:59:51,913 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:59:51,933 INFO L208 MainTranslator]: Completed translation [2020-07-21 16:59:51,934 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:59:51 WrapperNode [2020-07-21 16:59:51,934 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 16:59:51,935 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 16:59:51,936 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 16:59:51,936 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 16:59:51,952 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:59:51" (1/1) ... [2020-07-21 16:59:51,952 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:59:51" (1/1) ... [2020-07-21 16:59:51,959 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:59:51" (1/1) ... [2020-07-21 16:59:51,960 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:59:51" (1/1) ... [2020-07-21 16:59:51,965 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:59:51" (1/1) ... [2020-07-21 16:59:51,971 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:59:51" (1/1) ... [2020-07-21 16:59:51,973 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:59:51" (1/1) ... [2020-07-21 16:59:51,975 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 16:59:51,976 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 16:59:51,977 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 16:59:51,977 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 16:59:51,978 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:59:51" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:59:52,170 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 16:59:52,171 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 16:59:52,171 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 16:59:52,171 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 16:59:52,171 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 16:59:52,171 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 16:59:52,172 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 16:59:52,173 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 16:59:52,174 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 16:59:52,174 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 16:59:52,175 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 16:59:52,175 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 16:59:52,175 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 16:59:52,420 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 16:59:52,421 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 16:59:52,427 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:59:52 BoogieIcfgContainer [2020-07-21 16:59:52,427 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 16:59:52,435 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 16:59:52,436 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 16:59:52,440 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 16:59:52,440 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 04:59:51" (1/3) ... [2020-07-21 16:59:52,441 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d1ef455 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:59:52, skipping insertion in model container [2020-07-21 16:59:52,442 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:59:51" (2/3) ... [2020-07-21 16:59:52,442 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d1ef455 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:59:52, skipping insertion in model container [2020-07-21 16:59:52,443 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:59:52" (3/3) ... [2020-07-21 16:59:52,445 INFO L109 eAbstractionObserver]: Analyzing ICFG hhk2008.i [2020-07-21 16:59:52,458 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 16:59:52,469 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 16:59:52,489 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 16:59:52,526 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 16:59:52,526 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 16:59:52,526 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 16:59:52,526 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 16:59:52,527 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 16:59:52,527 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 16:59:52,527 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 16:59:52,527 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 16:59:52,557 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-21 16:59:52,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-07-21 16:59:52,567 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:59:52,569 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:59:52,570 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:59:52,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:59:52,581 INFO L82 PathProgramCache]: Analyzing trace with hash -677001103, now seen corresponding path program 1 times [2020-07-21 16:59:52,594 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:59:52,595 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1556098752] [2020-07-21 16:59:52,596 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:59:52,693 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:59:52,693 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:59:52,698 INFO L263 TraceCheckSpWp]: Trace formula consists of 35 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 16:59:52,706 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:59:52,884 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 16:59:52,951 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:59:52,952 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:59:52,954 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1556098752] [2020-07-21 16:59:52,955 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:59:52,956 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-21 16:59:52,957 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1544790406] [2020-07-21 16:59:52,965 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 16:59:52,966 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:59:52,985 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 16:59:52,986 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-21 16:59:52,990 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 6 states. [2020-07-21 16:59:53,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:59:53,215 INFO L93 Difference]: Finished difference Result 41 states and 50 transitions. [2020-07-21 16:59:53,216 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 16:59:53,218 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 12 [2020-07-21 16:59:53,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:59:53,230 INFO L225 Difference]: With dead ends: 41 [2020-07-21 16:59:53,231 INFO L226 Difference]: Without dead ends: 14 [2020-07-21 16:59:53,237 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 [2020-07-21 16:59:53,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-07-21 16:59:53,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-07-21 16:59:53,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-07-21 16:59:53,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-07-21 16:59:53,299 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-07-21 16:59:53,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:59:53,300 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-07-21 16:59:53,300 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 16:59:53,300 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-07-21 16:59:53,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 16:59:53,301 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:59:53,302 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:59:53,513 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:59:53,514 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:59:53,515 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:59:53,515 INFO L82 PathProgramCache]: Analyzing trace with hash 523340046, now seen corresponding path program 1 times [2020-07-21 16:59:53,516 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:59:53,516 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [263581874] [2020-07-21 16:59:53,517 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:59:53,566 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:59:53,566 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:59:53,568 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:59:53,571 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:59:53,656 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 16:59:53,716 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:59:53,717 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:59:53,755 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:59:53,854 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:59:53,854 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [263581874] [2020-07-21 16:59:53,855 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:59:53,855 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 16:59:53,855 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1102782039] [2020-07-21 16:59:53,858 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 16:59:53,858 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:59:53,859 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 16:59:53,859 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 16:59:53,860 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 10 states. [2020-07-21 16:59:54,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:59:54,169 INFO L93 Difference]: Finished difference Result 22 states and 23 transitions. [2020-07-21 16:59:54,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 16:59:54,170 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 13 [2020-07-21 16:59:54,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:59:54,172 INFO L225 Difference]: With dead ends: 22 [2020-07-21 16:59:54,173 INFO L226 Difference]: Without dead ends: 16 [2020-07-21 16:59:54,177 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 [2020-07-21 16:59:54,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-07-21 16:59:54,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-07-21 16:59:54,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-07-21 16:59:54,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-07-21 16:59:54,206 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 13 [2020-07-21 16:59:54,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:59:54,207 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-07-21 16:59:54,207 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 16:59:54,211 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-07-21 16:59:54,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-21 16:59:54,212 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:59:54,212 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:59:54,423 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:59:54,424 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:59:54,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:59:54,425 INFO L82 PathProgramCache]: Analyzing trace with hash 1555818862, now seen corresponding path program 2 times [2020-07-21 16:59:54,426 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:59:54,426 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [517515048] [2020-07-21 16:59:54,427 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:59:54,465 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:59:54,466 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:59:54,468 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 16:59:54,470 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:59:54,597 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 16:59:54,638 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:59:54,638 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:59:54,671 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:59:54,829 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:59:54,830 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [517515048] [2020-07-21 16:59:54,830 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:59:54,830 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 14 [2020-07-21 16:59:54,831 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [310446081] [2020-07-21 16:59:54,831 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 16:59:54,832 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:59:54,832 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 16:59:54,833 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 16:59:54,833 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 14 states. [2020-07-21 16:59:55,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:59:55,441 INFO L93 Difference]: Finished difference Result 26 states and 29 transitions. [2020-07-21 16:59:55,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 16:59:55,442 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 15 [2020-07-21 16:59:55,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:59:55,443 INFO L225 Difference]: With dead ends: 26 [2020-07-21 16:59:55,444 INFO L226 Difference]: Without dead ends: 20 [2020-07-21 16:59:55,445 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=124, Invalid=428, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:59:55,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-07-21 16:59:55,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-07-21 16:59:55,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-07-21 16:59:55,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-07-21 16:59:55,453 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 15 [2020-07-21 16:59:55,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:59:55,454 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-07-21 16:59:55,454 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 16:59:55,454 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-07-21 16:59:55,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 16:59:55,455 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:59:55,455 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:59:55,668 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:59:55,669 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:59:55,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:59:55,670 INFO L82 PathProgramCache]: Analyzing trace with hash 399696430, now seen corresponding path program 3 times [2020-07-21 16:59:55,671 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:59:55,672 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [559644473] [2020-07-21 16:59:55,672 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:59:55,721 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:59:55,721 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:59:55,723 WARN L261 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 36 conjunts are in the unsatisfiable core [2020-07-21 16:59:55,726 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:59:55,890 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 16:59:55,944 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:59:55,945 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:59:55,991 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:59:56,389 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:59:56,390 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [559644473] [2020-07-21 16:59:56,391 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:59:56,391 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 22 [2020-07-21 16:59:56,391 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1176172876] [2020-07-21 16:59:56,392 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 16:59:56,392 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:59:56,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 16:59:56,394 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=368, Unknown=0, NotChecked=0, Total=462 [2020-07-21 16:59:56,394 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 22 states. [2020-07-21 16:59:56,988 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 40 [2020-07-21 16:59:57,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:59:57,858 INFO L93 Difference]: Finished difference Result 34 states and 41 transitions. [2020-07-21 16:59:57,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-21 16:59:57,859 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 19 [2020-07-21 16:59:57,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:59:57,860 INFO L225 Difference]: With dead ends: 34 [2020-07-21 16:59:57,861 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 16:59:57,862 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=352, Invalid=1208, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 16:59:57,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 16:59:57,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-07-21 16:59:57,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-21 16:59:57,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-07-21 16:59:57,873 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 19 [2020-07-21 16:59:57,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:59:57,874 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-07-21 16:59:57,874 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 16:59:57,874 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-07-21 16:59:57,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 16:59:57,875 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:59:57,875 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:59:58,090 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:59:58,090 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:59:58,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:59:58,092 INFO L82 PathProgramCache]: Analyzing trace with hash -852380754, now seen corresponding path program 4 times [2020-07-21 16:59:58,093 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:59:58,093 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1693592705] [2020-07-21 16:59:58,094 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:59:58,147 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:59:58,148 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:59:58,150 WARN L261 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 68 conjunts are in the unsatisfiable core [2020-07-21 16:59:58,154 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:59:58,539 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 16:59:58,611 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:59:58,611 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:59:58,675 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:59:59,692 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:59:59,693 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1693592705] [2020-07-21 16:59:59,693 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:59:59,694 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 38 [2020-07-21 16:59:59,694 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1157320936] [2020-07-21 16:59:59,695 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-07-21 16:59:59,695 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:59:59,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-07-21 16:59:59,697 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=302, Invalid=1104, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 16:59:59,697 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 38 states. [2020-07-21 17:00:00,844 WARN L193 SmtUtils]: Spent 177.00 ms on a formula simplification that was a NOOP. DAG size: 102 [2020-07-21 17:00:01,147 WARN L193 SmtUtils]: Spent 218.00 ms on a formula simplification. DAG size of input: 103 DAG size of output: 72 [2020-07-21 17:00:01,408 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2020-07-21 17:00:01,682 WARN L193 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 98 DAG size of output: 68 [2020-07-21 17:00:01,991 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2020-07-21 17:00:02,302 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-21 17:00:02,796 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-21 17:00:04,470 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2020-07-21 17:00:04,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:00:04,484 INFO L93 Difference]: Finished difference Result 50 states and 65 transitions. [2020-07-21 17:00:04,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-07-21 17:00:04,486 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 27 [2020-07-21 17:00:04,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:00:04,487 INFO L225 Difference]: With dead ends: 50 [2020-07-21 17:00:04,488 INFO L226 Difference]: Without dead ends: 44 [2020-07-21 17:00:04,491 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 632 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=1192, Invalid=3920, Unknown=0, NotChecked=0, Total=5112 [2020-07-21 17:00:04,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-07-21 17:00:04,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-07-21 17:00:04,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-07-21 17:00:04,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-07-21 17:00:04,506 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 27 [2020-07-21 17:00:04,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:00:04,507 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-07-21 17:00:04,507 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-07-21 17:00:04,507 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-07-21 17:00:04,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-07-21 17:00:04,509 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:00:04,509 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:00:04,721 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:00:04,721 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:00:04,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:00:04,722 INFO L82 PathProgramCache]: Analyzing trace with hash -2114791762, now seen corresponding path program 5 times [2020-07-21 17:00:04,723 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:00:04,723 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1040467998] [2020-07-21 17:00:04,724 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:00:04,807 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:00:04,807 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:00:04,812 WARN L261 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 132 conjunts are in the unsatisfiable core [2020-07-21 17:00:04,821 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:00:06,092 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 17:00:06,221 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:00:06,222 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 17:00:06,334 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 17:00:10,077 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:00:10,078 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1040467998] [2020-07-21 17:00:10,078 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 17:00:10,078 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37] total 70 [2020-07-21 17:00:10,078 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2140693650] [2020-07-21 17:00:10,079 INFO L459 AbstractCegarLoop]: Interpolant automaton has 70 states [2020-07-21 17:00:10,080 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:00:10,081 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2020-07-21 17:00:10,083 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1102, Invalid=3728, Unknown=0, NotChecked=0, Total=4830 [2020-07-21 17:00:10,084 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 70 states. [2020-07-21 17:00:13,435 WARN L193 SmtUtils]: Spent 345.00 ms on a formula simplification that was a NOOP. DAG size: 198 [2020-07-21 17:00:14,152 WARN L193 SmtUtils]: Spent 544.00 ms on a formula simplification. DAG size of input: 199 DAG size of output: 136 [2020-07-21 17:00:14,913 WARN L193 SmtUtils]: Spent 354.00 ms on a formula simplification that was a NOOP. DAG size: 190 [2020-07-21 17:00:15,609 WARN L193 SmtUtils]: Spent 519.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 132 [2020-07-21 17:00:16,317 WARN L193 SmtUtils]: Spent 344.00 ms on a formula simplification that was a NOOP. DAG size: 184 [2020-07-21 17:00:17,122 WARN L193 SmtUtils]: Spent 317.00 ms on a formula simplification that was a NOOP. DAG size: 178 [2020-07-21 17:00:17,846 WARN L193 SmtUtils]: Spent 310.00 ms on a formula simplification that was a NOOP. DAG size: 172 [2020-07-21 17:00:18,524 WARN L193 SmtUtils]: Spent 295.00 ms on a formula simplification that was a NOOP. DAG size: 166 [2020-07-21 17:00:19,200 WARN L193 SmtUtils]: Spent 290.00 ms on a formula simplification that was a NOOP. DAG size: 160 [2020-07-21 17:00:19,836 WARN L193 SmtUtils]: Spent 265.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2020-07-21 17:00:20,485 WARN L193 SmtUtils]: Spent 250.00 ms on a formula simplification that was a NOOP. DAG size: 148 [2020-07-21 17:00:21,097 WARN L193 SmtUtils]: Spent 242.00 ms on a formula simplification that was a NOOP. DAG size: 142 [2020-07-21 17:00:21,824 WARN L193 SmtUtils]: Spent 223.00 ms on a formula simplification that was a NOOP. DAG size: 136 [2020-07-21 17:00:22,390 WARN L193 SmtUtils]: Spent 216.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2020-07-21 17:00:22,949 WARN L193 SmtUtils]: Spent 202.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2020-07-21 17:00:23,495 WARN L193 SmtUtils]: Spent 193.00 ms on a formula simplification that was a NOOP. DAG size: 118 [2020-07-21 17:00:24,002 WARN L193 SmtUtils]: Spent 181.00 ms on a formula simplification that was a NOOP. DAG size: 112 [2020-07-21 17:00:24,489 WARN L193 SmtUtils]: Spent 169.00 ms on a formula simplification that was a NOOP. DAG size: 106 [2020-07-21 17:00:24,982 WARN L193 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 100 [2020-07-21 17:00:25,447 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2020-07-21 17:00:25,802 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2020-07-21 17:00:26,225 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-21 17:00:26,678 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 76 [2020-07-21 17:00:27,090 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-21 17:00:30,916 WARN L193 SmtUtils]: Spent 391.00 ms on a formula simplification that was a NOOP. DAG size: 193 [2020-07-21 17:00:30,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:00:30,931 INFO L93 Difference]: Finished difference Result 82 states and 113 transitions. [2020-07-21 17:00:30,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2020-07-21 17:00:30,932 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 43 [2020-07-21 17:00:30,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:00:30,933 INFO L225 Difference]: With dead ends: 82 [2020-07-21 17:00:30,934 INFO L226 Difference]: Without dead ends: 76 [2020-07-21 17:00:30,939 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2296 ImplicationChecksByTransitivity, 23.7s TimeCoverageRelationStatistics Valid=4408, Invalid=13952, Unknown=0, NotChecked=0, Total=18360 [2020-07-21 17:00:30,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-07-21 17:00:30,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2020-07-21 17:00:30,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 17:00:30,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 76 transitions. [2020-07-21 17:00:30,969 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 76 transitions. Word has length 43 [2020-07-21 17:00:30,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:00:30,970 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 76 transitions. [2020-07-21 17:00:30,970 INFO L480 AbstractCegarLoop]: Interpolant automaton has 70 states. [2020-07-21 17:00:30,970 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 76 transitions. [2020-07-21 17:00:30,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-07-21 17:00:30,973 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:00:30,973 INFO L422 BasicCegarLoop]: trace histogram [63, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:00:31,186 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:00:31,188 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:00:31,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:00:31,190 INFO L82 PathProgramCache]: Analyzing trace with hash -1115480914, now seen corresponding path program 6 times [2020-07-21 17:00:31,190 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:00:31,190 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [711538456] [2020-07-21 17:00:31,191 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:00:31,281 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:00:31,281 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:00:31,293 WARN L261 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 260 conjunts are in the unsatisfiable core [2020-07-21 17:00:31,299 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:00:36,715 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 17:00:37,061 INFO L134 CoverageAnalysis]: Checked inductivity of 2016 backedges. 0 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:00:37,062 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 17:00:37,370 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 17:00:56,261 INFO L134 CoverageAnalysis]: Checked inductivity of 2016 backedges. 0 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:00:56,263 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [711538456] [2020-07-21 17:00:56,263 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 17:00:56,263 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69] total 134 [2020-07-21 17:00:56,265 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1601291951] [2020-07-21 17:00:56,270 INFO L459 AbstractCegarLoop]: Interpolant automaton has 134 states [2020-07-21 17:00:56,270 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:00:56,272 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 134 interpolants. [2020-07-21 17:00:56,279 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4238, Invalid=13584, Unknown=0, NotChecked=0, Total=17822 [2020-07-21 17:00:56,279 INFO L87 Difference]: Start difference. First operand 76 states and 76 transitions. Second operand 134 states. [2020-07-21 17:01:13,841 WARN L193 SmtUtils]: Spent 1.44 s on a formula simplification that was a NOOP. DAG size: 390 [2020-07-21 17:01:16,379 WARN L193 SmtUtils]: Spent 1.92 s on a formula simplification. DAG size of input: 391 DAG size of output: 264 [2020-07-21 17:01:20,098 WARN L193 SmtUtils]: Spent 1.61 s on a formula simplification that was a NOOP. DAG size: 382 [2020-07-21 17:01:22,299 WARN L193 SmtUtils]: Spent 1.78 s on a formula simplification. DAG size of input: 386 DAG size of output: 260 [2020-07-21 17:01:25,932 WARN L193 SmtUtils]: Spent 1.58 s on a formula simplification that was a NOOP. DAG size: 376 [2020-07-21 17:01:29,998 WARN L193 SmtUtils]: Spent 1.60 s on a formula simplification that was a NOOP. DAG size: 370 [2020-07-21 17:01:33,482 WARN L193 SmtUtils]: Spent 1.30 s on a formula simplification that was a NOOP. DAG size: 364 [2020-07-21 17:01:37,475 WARN L193 SmtUtils]: Spent 1.71 s on a formula simplification that was a NOOP. DAG size: 358 [2020-07-21 17:01:41,505 WARN L193 SmtUtils]: Spent 1.65 s on a formula simplification that was a NOOP. DAG size: 352 [2020-07-21 17:01:45,562 WARN L193 SmtUtils]: Spent 1.69 s on a formula simplification that was a NOOP. DAG size: 346 [2020-07-21 17:01:49,675 WARN L193 SmtUtils]: Spent 1.69 s on a formula simplification that was a NOOP. DAG size: 340 [2020-07-21 17:01:53,758 WARN L193 SmtUtils]: Spent 1.68 s on a formula simplification that was a NOOP. DAG size: 334 [2020-07-21 17:01:57,931 WARN L193 SmtUtils]: Spent 1.67 s on a formula simplification that was a NOOP. DAG size: 328 [2020-07-21 17:02:02,280 WARN L193 SmtUtils]: Spent 1.69 s on a formula simplification that was a NOOP. DAG size: 322 [2020-07-21 17:02:06,656 WARN L193 SmtUtils]: Spent 1.64 s on a formula simplification that was a NOOP. DAG size: 316 [2020-07-21 17:02:11,128 WARN L193 SmtUtils]: Spent 1.68 s on a formula simplification that was a NOOP. DAG size: 310 [2020-07-21 17:02:15,686 WARN L193 SmtUtils]: Spent 1.64 s on a formula simplification that was a NOOP. DAG size: 304 [2020-07-21 17:02:20,320 WARN L193 SmtUtils]: Spent 1.57 s on a formula simplification that was a NOOP. DAG size: 298 [2020-07-21 17:02:24,271 WARN L193 SmtUtils]: Spent 1.04 s on a formula simplification that was a NOOP. DAG size: 292 [2020-07-21 17:02:27,099 WARN L193 SmtUtils]: Spent 1.02 s on a formula simplification that was a NOOP. DAG size: 286 [2020-07-21 17:02:29,911 WARN L193 SmtUtils]: Spent 984.00 ms on a formula simplification that was a NOOP. DAG size: 280 [2020-07-21 17:02:32,549 WARN L193 SmtUtils]: Spent 870.00 ms on a formula simplification that was a NOOP. DAG size: 274 [2020-07-21 17:02:35,317 WARN L193 SmtUtils]: Spent 906.00 ms on a formula simplification that was a NOOP. DAG size: 268 [2020-07-21 17:02:38,097 WARN L193 SmtUtils]: Spent 882.00 ms on a formula simplification that was a NOOP. DAG size: 262 [2020-07-21 17:02:40,867 WARN L193 SmtUtils]: Spent 899.00 ms on a formula simplification that was a NOOP. DAG size: 256 [2020-07-21 17:02:43,495 WARN L193 SmtUtils]: Spent 794.00 ms on a formula simplification that was a NOOP. DAG size: 250 [2020-07-21 17:02:46,172 WARN L193 SmtUtils]: Spent 823.00 ms on a formula simplification that was a NOOP. DAG size: 244 [2020-07-21 17:02:48,819 WARN L193 SmtUtils]: Spent 797.00 ms on a formula simplification that was a NOOP. DAG size: 238 [2020-07-21 17:02:51,464 WARN L193 SmtUtils]: Spent 795.00 ms on a formula simplification that was a NOOP. DAG size: 232 [2020-07-21 17:02:54,066 WARN L193 SmtUtils]: Spent 744.00 ms on a formula simplification that was a NOOP. DAG size: 226 [2020-07-21 17:02:56,688 WARN L193 SmtUtils]: Spent 753.00 ms on a formula simplification that was a NOOP. DAG size: 220 [2020-07-21 17:02:59,291 WARN L193 SmtUtils]: Spent 728.00 ms on a formula simplification that was a NOOP. DAG size: 214 [2020-07-21 17:03:01,936 WARN L193 SmtUtils]: Spent 768.00 ms on a formula simplification that was a NOOP. DAG size: 208 [2020-07-21 17:03:04,652 WARN L193 SmtUtils]: Spent 751.00 ms on a formula simplification that was a NOOP. DAG size: 202 [2020-07-21 17:03:07,260 WARN L193 SmtUtils]: Spent 714.00 ms on a formula simplification that was a NOOP. DAG size: 196 [2020-07-21 17:03:09,805 WARN L193 SmtUtils]: Spent 682.00 ms on a formula simplification that was a NOOP. DAG size: 190 [2020-07-21 17:03:12,332 WARN L193 SmtUtils]: Spent 677.00 ms on a formula simplification that was a NOOP. DAG size: 184 [2020-07-21 17:03:14,926 WARN L193 SmtUtils]: Spent 712.00 ms on a formula simplification that was a NOOP. DAG size: 178 [2020-07-21 17:03:17,345 WARN L193 SmtUtils]: Spent 627.00 ms on a formula simplification that was a NOOP. DAG size: 172 [2020-07-21 17:03:19,737 WARN L193 SmtUtils]: Spent 662.00 ms on a formula simplification that was a NOOP. DAG size: 166 [2020-07-21 17:03:22,426 WARN L193 SmtUtils]: Spent 589.00 ms on a formula simplification that was a NOOP. DAG size: 160 [2020-07-21 17:03:24,968 WARN L193 SmtUtils]: Spent 646.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2020-07-21 17:03:27,353 WARN L193 SmtUtils]: Spent 522.00 ms on a formula simplification that was a NOOP. DAG size: 148 [2020-07-21 17:03:29,534 WARN L193 SmtUtils]: Spent 512.00 ms on a formula simplification that was a NOOP. DAG size: 142 [2020-07-21 17:03:31,725 WARN L193 SmtUtils]: Spent 497.00 ms on a formula simplification that was a NOOP. DAG size: 136 [2020-07-21 17:03:33,856 WARN L193 SmtUtils]: Spent 481.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2020-07-21 17:03:35,985 WARN L193 SmtUtils]: Spent 452.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2020-07-21 17:03:38,005 WARN L193 SmtUtils]: Spent 425.00 ms on a formula simplification that was a NOOP. DAG size: 118 [2020-07-21 17:03:40,070 WARN L193 SmtUtils]: Spent 351.00 ms on a formula simplification that was a NOOP. DAG size: 112 [2020-07-21 17:03:41,910 WARN L193 SmtUtils]: Spent 346.00 ms on a formula simplification that was a NOOP. DAG size: 106 [2020-07-21 17:03:43,587 WARN L193 SmtUtils]: Spent 332.00 ms on a formula simplification that was a NOOP. DAG size: 100 [2020-07-21 17:03:45,237 WARN L193 SmtUtils]: Spent 321.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2020-07-21 17:03:47,018 WARN L193 SmtUtils]: Spent 286.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2020-07-21 17:03:48,771 WARN L193 SmtUtils]: Spent 319.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-21 17:03:50,409 WARN L193 SmtUtils]: Spent 299.00 ms on a formula simplification that was a NOOP. DAG size: 76 [2020-07-21 17:03:51,916 WARN L193 SmtUtils]: Spent 239.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-21 17:03:53,287 WARN L193 SmtUtils]: Spent 208.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 17:03:54,608 WARN L193 SmtUtils]: Spent 185.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 17:03:55,891 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-21 17:03:57,083 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 17:03:58,261 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 17:03:59,280 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-21 17:04:08,970 WARN L193 SmtUtils]: Spent 2.20 s on a formula simplification that was a NOOP. DAG size: 385 [2020-07-21 17:04:08,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:04:08,995 INFO L93 Difference]: Finished difference Result 146 states and 209 transitions. [2020-07-21 17:04:08,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 134 states. [2020-07-21 17:04:08,998 INFO L78 Accepts]: Start accepts. Automaton has 134 states. Word has length 75 [2020-07-21 17:04:08,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:04:09,002 INFO L225 Difference]: With dead ends: 146 [2020-07-21 17:04:09,002 INFO L226 Difference]: Without dead ends: 140 [2020-07-21 17:04:09,011 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 262 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8696 ImplicationChecksByTransitivity, 206.1s TimeCoverageRelationStatistics Valid=16984, Invalid=52448, Unknown=0, NotChecked=0, Total=69432 [2020-07-21 17:04:09,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2020-07-21 17:04:09,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 140. [2020-07-21 17:04:09,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2020-07-21 17:04:09,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 140 transitions. [2020-07-21 17:04:09,072 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 140 transitions. Word has length 75 [2020-07-21 17:04:09,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:04:09,073 INFO L479 AbstractCegarLoop]: Abstraction has 140 states and 140 transitions. [2020-07-21 17:04:09,073 INFO L480 AbstractCegarLoop]: Interpolant automaton has 134 states. [2020-07-21 17:04:09,073 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 140 transitions. [2020-07-21 17:04:09,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2020-07-21 17:04:09,078 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:04:09,078 INFO L422 BasicCegarLoop]: trace histogram [127, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:04:09,279 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:04:09,280 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:04:09,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:04:09,281 INFO L82 PathProgramCache]: Analyzing trace with hash -858019666, now seen corresponding path program 7 times [2020-07-21 17:04:09,281 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:04:09,281 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1973930858] [2020-07-21 17:04:09,282 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:04:09,428 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:04:09,428 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:04:09,442 WARN L261 TraceCheckSpWp]: Trace formula consists of 670 conjuncts, 516 conjunts are in the unsatisfiable core [2020-07-21 17:04:09,452 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:04:42,381 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 17:04:43,754 INFO L134 CoverageAnalysis]: Checked inductivity of 8128 backedges. 0 proven. 8128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:04:43,755 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 17:04:45,054 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 17:07:42,419 INFO L134 CoverageAnalysis]: Checked inductivity of 8128 backedges. 0 proven. 8128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:07:42,419 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1973930858] [2020-07-21 17:07:42,420 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 17:07:42,420 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [133, 133] total 262 [2020-07-21 17:07:42,420 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2091436613] [2020-07-21 17:07:42,421 INFO L459 AbstractCegarLoop]: Interpolant automaton has 262 states [2020-07-21 17:07:42,421 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:07:42,426 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 262 interpolants. [2020-07-21 17:07:42,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16654, Invalid=51728, Unknown=0, NotChecked=0, Total=68382 [2020-07-21 17:07:42,430 INFO L87 Difference]: Start difference. First operand 140 states and 140 transitions. Second operand 262 states. [2020-07-21 17:11:08,276 WARN L193 SmtUtils]: Spent 9.23 s on a formula simplification that was a NOOP. DAG size: 774 [2020-07-21 17:11:23,116 WARN L193 SmtUtils]: Spent 12.06 s on a formula simplification. DAG size of input: 775 DAG size of output: 520 [2020-07-21 17:12:42,069 WARN L193 SmtUtils]: Spent 13.01 s on a formula simplification that was a NOOP. DAG size: 766 [2020-07-21 17:12:56,132 WARN L193 SmtUtils]: Spent 12.30 s on a formula simplification. DAG size of input: 770 DAG size of output: 516