/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/hhk2008.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 17:56:39,062 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 17:56:39,066 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 17:56:39,091 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 17:56:39,091 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 17:56:39,094 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 17:56:39,098 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 17:56:39,108 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 17:56:39,111 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 17:56:39,112 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 17:56:39,113 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 17:56:39,115 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 17:56:39,115 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 17:56:39,117 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 17:56:39,118 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 17:56:39,120 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 17:56:39,121 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 17:56:39,123 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 17:56:39,125 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 17:56:39,127 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 17:56:39,129 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 17:56:39,131 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 17:56:39,132 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 17:56:39,134 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 17:56:39,137 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 17:56:39,147 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 17:56:39,149 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 17:56:39,150 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 17:56:39,151 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 17:56:39,168 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 17:56:39,168 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 17:56:39,170 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 17:56:39,170 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 17:56:39,170 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 17:56:39,171 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 17:56:39,171 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 17:56:39,171 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 17:56:39,171 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 17:56:39,171 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 17:56:39,172 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 17:56:39,172 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 17:56:39,172 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 17:56:39,172 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 17:56:39,173 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 17:56:39,173 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 17:56:39,173 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 17:56:39,173 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 17:56:39,173 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 17:56:39,174 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 17:56:39,174 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 17:56:39,174 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 17:56:39,174 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 17:56:39,174 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 17:56:39,175 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 17:56:39,175 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 17:56:39,175 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:56:39,175 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 17:56:39,175 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 17:56:39,176 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 17:56:39,511 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 17:56:39,537 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 17:56:39,543 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 17:56:39,545 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 17:56:39,549 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 17:56:39,550 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/hhk2008.i [2020-07-20 17:56:39,651 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4c3c4629f/4d4de3a66f7e469198e6abd6dee6ab1a/FLAG174c85348 [2020-07-20 17:56:40,226 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 17:56:40,229 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-lit/hhk2008.i [2020-07-20 17:56:40,241 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4c3c4629f/4d4de3a66f7e469198e6abd6dee6ab1a/FLAG174c85348 [2020-07-20 17:56:40,521 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4c3c4629f/4d4de3a66f7e469198e6abd6dee6ab1a [2020-07-20 17:56:40,534 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 17:56:40,538 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 17:56:40,540 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 17:56:40,540 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 17:56:40,545 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 17:56:40,547 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:56:40" (1/1) ... [2020-07-20 17:56:40,552 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7808e504 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:56:40, skipping insertion in model container [2020-07-20 17:56:40,553 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:56:40" (1/1) ... [2020-07-20 17:56:40,567 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 17:56:40,596 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 17:56:40,802 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:56:40,808 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 17:56:40,828 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:56:40,844 INFO L208 MainTranslator]: Completed translation [2020-07-20 17:56:40,845 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:56:40 WrapperNode [2020-07-20 17:56:40,845 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 17:56:40,846 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 17:56:40,846 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 17:56:40,846 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 17:56:40,859 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:56:40" (1/1) ... [2020-07-20 17:56:40,859 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:56:40" (1/1) ... [2020-07-20 17:56:40,866 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:56:40" (1/1) ... [2020-07-20 17:56:40,867 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:56:40" (1/1) ... [2020-07-20 17:56:40,872 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:56:40" (1/1) ... [2020-07-20 17:56:40,879 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:56:40" (1/1) ... [2020-07-20 17:56:40,880 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:56:40" (1/1) ... [2020-07-20 17:56:40,882 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 17:56:40,883 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 17:56:40,883 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 17:56:40,883 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 17:56:40,885 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:56:40" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 17:56:41,070 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 17:56:41,070 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 17:56:41,070 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 17:56:41,070 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 17:56:41,071 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 17:56:41,071 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 17:56:41,071 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 17:56:41,071 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 17:56:41,071 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 17:56:41,072 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 17:56:41,072 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 17:56:41,072 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 17:56:41,072 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 17:56:41,306 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 17:56:41,307 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 17:56:41,313 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:56:41 BoogieIcfgContainer [2020-07-20 17:56:41,314 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 17:56:41,316 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 17:56:41,317 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 17:56:41,321 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 17:56:41,322 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 05:56:40" (1/3) ... [2020-07-20 17:56:41,324 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6ccd616d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:56:41, skipping insertion in model container [2020-07-20 17:56:41,324 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:56:40" (2/3) ... [2020-07-20 17:56:41,324 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6ccd616d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:56:41, skipping insertion in model container [2020-07-20 17:56:41,325 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:56:41" (3/3) ... [2020-07-20 17:56:41,327 INFO L109 eAbstractionObserver]: Analyzing ICFG hhk2008.i [2020-07-20 17:56:41,344 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 17:56:41,354 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 17:56:41,385 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 17:56:41,441 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 17:56:41,443 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 17:56:41,444 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 17:56:41,444 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 17:56:41,444 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 17:56:41,444 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 17:56:41,444 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 17:56:41,444 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 17:56:41,477 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-20 17:56:41,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-07-20 17:56:41,486 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:56:41,488 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:56:41,488 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:56:41,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:56:41,498 INFO L82 PathProgramCache]: Analyzing trace with hash -677001103, now seen corresponding path program 1 times [2020-07-20 17:56:41,509 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:56:41,510 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [647181706] [2020-07-20 17:56:41,510 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:56:41,632 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:56:41,633 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:56:41,637 INFO L263 TraceCheckSpWp]: Trace formula consists of 35 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 17:56:41,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:56:41,773 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-20 17:56:41,841 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:56:41,842 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:56:41,843 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [647181706] [2020-07-20 17:56:41,845 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:56:41,850 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-20 17:56:41,852 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1138197253] [2020-07-20 17:56:41,860 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 17:56:41,860 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:56:41,878 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 17:56:41,879 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-20 17:56:41,881 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 6 states. [2020-07-20 17:56:42,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:56:42,066 INFO L93 Difference]: Finished difference Result 41 states and 50 transitions. [2020-07-20 17:56:42,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 17:56:42,069 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 12 [2020-07-20 17:56:42,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:56:42,081 INFO L225 Difference]: With dead ends: 41 [2020-07-20 17:56:42,081 INFO L226 Difference]: Without dead ends: 14 [2020-07-20 17:56:42,087 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 17:56:42,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-07-20 17:56:42,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-07-20 17:56:42,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-07-20 17:56:42,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-07-20 17:56:42,142 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-07-20 17:56:42,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:56:42,143 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-07-20 17:56:42,143 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 17:56:42,143 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-07-20 17:56:42,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 17:56:42,144 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:56:42,145 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:56:42,359 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:56:42,359 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:56:42,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:56:42,360 INFO L82 PathProgramCache]: Analyzing trace with hash 523340046, now seen corresponding path program 1 times [2020-07-20 17:56:42,360 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:56:42,361 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [336995965] [2020-07-20 17:56:42,361 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:56:42,400 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:56:42,400 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:56:42,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 17:56:42,404 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:56:42,492 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-20 17:56:42,530 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 17:56:42,531 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:56:42,559 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:56:42,639 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 17:56:42,639 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [336995965] [2020-07-20 17:56:42,639 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:56:42,640 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 17:56:42,640 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [217961233] [2020-07-20 17:56:42,642 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 17:56:42,643 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:56:42,644 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 17:56:42,644 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 17:56:42,644 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 10 states. [2020-07-20 17:56:42,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:56:42,897 INFO L93 Difference]: Finished difference Result 22 states and 23 transitions. [2020-07-20 17:56:42,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 17:56:42,898 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 13 [2020-07-20 17:56:42,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:56:42,899 INFO L225 Difference]: With dead ends: 22 [2020-07-20 17:56:42,900 INFO L226 Difference]: Without dead ends: 16 [2020-07-20 17:56:42,902 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 17:56:42,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-07-20 17:56:42,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-07-20 17:56:42,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-07-20 17:56:42,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-07-20 17:56:42,909 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 13 [2020-07-20 17:56:42,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:56:42,910 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-07-20 17:56:42,910 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 17:56:42,910 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-07-20 17:56:42,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-20 17:56:42,911 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:56:42,911 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:56:43,125 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:56:43,126 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:56:43,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:56:43,127 INFO L82 PathProgramCache]: Analyzing trace with hash 1555818862, now seen corresponding path program 2 times [2020-07-20 17:56:43,127 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:56:43,128 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1298173773] [2020-07-20 17:56:43,129 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:56:43,184 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:56:43,184 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:56:43,186 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 17:56:43,188 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:56:43,285 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-20 17:56:43,333 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 17:56:43,333 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:56:43,378 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:56:43,545 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 17:56:43,546 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1298173773] [2020-07-20 17:56:43,546 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:56:43,546 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 14 [2020-07-20 17:56:43,547 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1872108126] [2020-07-20 17:56:43,549 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 17:56:43,549 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:56:43,550 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 17:56:43,551 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 17:56:43,552 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 14 states. [2020-07-20 17:56:44,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:56:44,108 INFO L93 Difference]: Finished difference Result 26 states and 29 transitions. [2020-07-20 17:56:44,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 17:56:44,109 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 15 [2020-07-20 17:56:44,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:56:44,110 INFO L225 Difference]: With dead ends: 26 [2020-07-20 17:56:44,111 INFO L226 Difference]: Without dead ends: 20 [2020-07-20 17:56:44,112 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=124, Invalid=428, Unknown=0, NotChecked=0, Total=552 [2020-07-20 17:56:44,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-07-20 17:56:44,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-07-20 17:56:44,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-07-20 17:56:44,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-07-20 17:56:44,127 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 15 [2020-07-20 17:56:44,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:56:44,129 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-07-20 17:56:44,129 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 17:56:44,130 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-07-20 17:56:44,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 17:56:44,131 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:56:44,131 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:56:44,332 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:56:44,333 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:56:44,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:56:44,334 INFO L82 PathProgramCache]: Analyzing trace with hash 399696430, now seen corresponding path program 3 times [2020-07-20 17:56:44,334 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:56:44,335 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [194610292] [2020-07-20 17:56:44,336 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:56:44,385 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:56:44,386 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:56:44,388 WARN L261 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 36 conjunts are in the unsatisfiable core [2020-07-20 17:56:44,390 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:56:44,562 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-20 17:56:44,606 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 17:56:44,606 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:56:44,656 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:56:44,998 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 17:56:44,999 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [194610292] [2020-07-20 17:56:44,999 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:56:45,000 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 22 [2020-07-20 17:56:45,000 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1021614357] [2020-07-20 17:56:45,001 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 17:56:45,001 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:56:45,002 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 17:56:45,002 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=368, Unknown=0, NotChecked=0, Total=462 [2020-07-20 17:56:45,002 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 22 states. [2020-07-20 17:56:45,553 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 40 [2020-07-20 17:56:46,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:56:46,361 INFO L93 Difference]: Finished difference Result 34 states and 41 transitions. [2020-07-20 17:56:46,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-20 17:56:46,362 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 19 [2020-07-20 17:56:46,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:56:46,363 INFO L225 Difference]: With dead ends: 34 [2020-07-20 17:56:46,363 INFO L226 Difference]: Without dead ends: 28 [2020-07-20 17:56:46,365 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=352, Invalid=1208, Unknown=0, NotChecked=0, Total=1560 [2020-07-20 17:56:46,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-20 17:56:46,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-07-20 17:56:46,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-20 17:56:46,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-07-20 17:56:46,374 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 19 [2020-07-20 17:56:46,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:56:46,375 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-07-20 17:56:46,375 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 17:56:46,375 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-07-20 17:56:46,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 17:56:46,376 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:56:46,376 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:56:46,590 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:56:46,591 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:56:46,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:56:46,592 INFO L82 PathProgramCache]: Analyzing trace with hash -852380754, now seen corresponding path program 4 times [2020-07-20 17:56:46,593 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:56:46,593 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [223413392] [2020-07-20 17:56:46,594 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:56:46,637 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:56:46,638 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:56:46,640 WARN L261 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 68 conjunts are in the unsatisfiable core [2020-07-20 17:56:46,642 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:56:47,022 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-20 17:56:47,089 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 17:56:47,089 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:56:47,154 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:56:48,138 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 17:56:48,139 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [223413392] [2020-07-20 17:56:48,139 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:56:48,140 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 38 [2020-07-20 17:56:48,140 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [625548163] [2020-07-20 17:56:48,141 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-07-20 17:56:48,141 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:56:48,142 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-07-20 17:56:48,142 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=302, Invalid=1104, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 17:56:48,143 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 38 states. [2020-07-20 17:56:49,203 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 102 [2020-07-20 17:56:49,494 WARN L193 SmtUtils]: Spent 224.00 ms on a formula simplification. DAG size of input: 103 DAG size of output: 72 [2020-07-20 17:56:49,759 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2020-07-20 17:56:50,004 WARN L193 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 98 DAG size of output: 68 [2020-07-20 17:56:50,248 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2020-07-20 17:56:50,515 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-20 17:56:52,548 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2020-07-20 17:56:52,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:56:52,562 INFO L93 Difference]: Finished difference Result 50 states and 65 transitions. [2020-07-20 17:56:52,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-07-20 17:56:52,563 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 27 [2020-07-20 17:56:52,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:56:52,564 INFO L225 Difference]: With dead ends: 50 [2020-07-20 17:56:52,565 INFO L226 Difference]: Without dead ends: 44 [2020-07-20 17:56:52,568 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 632 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=1192, Invalid=3920, Unknown=0, NotChecked=0, Total=5112 [2020-07-20 17:56:52,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-07-20 17:56:52,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-07-20 17:56:52,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-07-20 17:56:52,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-07-20 17:56:52,581 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 27 [2020-07-20 17:56:52,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:56:52,582 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-07-20 17:56:52,582 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-07-20 17:56:52,582 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-07-20 17:56:52,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-07-20 17:56:52,583 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:56:52,584 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:56:52,799 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:56:52,800 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:56:52,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:56:52,801 INFO L82 PathProgramCache]: Analyzing trace with hash -2114791762, now seen corresponding path program 5 times [2020-07-20 17:56:52,801 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:56:52,802 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1039596373] [2020-07-20 17:56:52,802 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:56:52,859 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:56:52,860 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:56:52,864 WARN L261 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 132 conjunts are in the unsatisfiable core [2020-07-20 17:56:52,868 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:56:54,070 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-20 17:56:54,199 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 17:56:54,200 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:56:54,320 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:56:57,917 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 17:56:57,918 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1039596373] [2020-07-20 17:56:57,919 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:56:57,919 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37] total 70 [2020-07-20 17:56:57,919 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1886945145] [2020-07-20 17:56:57,920 INFO L459 AbstractCegarLoop]: Interpolant automaton has 70 states [2020-07-20 17:56:57,920 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:56:57,921 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2020-07-20 17:56:57,924 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1102, Invalid=3728, Unknown=0, NotChecked=0, Total=4830 [2020-07-20 17:56:57,924 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 70 states. [2020-07-20 17:57:01,225 WARN L193 SmtUtils]: Spent 327.00 ms on a formula simplification that was a NOOP. DAG size: 198 [2020-07-20 17:57:01,901 WARN L193 SmtUtils]: Spent 514.00 ms on a formula simplification. DAG size of input: 199 DAG size of output: 136 [2020-07-20 17:57:02,602 WARN L193 SmtUtils]: Spent 327.00 ms on a formula simplification that was a NOOP. DAG size: 190 [2020-07-20 17:57:03,224 WARN L193 SmtUtils]: Spent 494.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 132 [2020-07-20 17:57:03,964 WARN L193 SmtUtils]: Spent 346.00 ms on a formula simplification that was a NOOP. DAG size: 184 [2020-07-20 17:57:04,709 WARN L193 SmtUtils]: Spent 288.00 ms on a formula simplification that was a NOOP. DAG size: 178 [2020-07-20 17:57:05,358 WARN L193 SmtUtils]: Spent 285.00 ms on a formula simplification that was a NOOP. DAG size: 172 [2020-07-20 17:57:05,988 WARN L193 SmtUtils]: Spent 272.00 ms on a formula simplification that was a NOOP. DAG size: 166 [2020-07-20 17:57:06,634 WARN L193 SmtUtils]: Spent 282.00 ms on a formula simplification that was a NOOP. DAG size: 160 [2020-07-20 17:57:07,186 WARN L193 SmtUtils]: Spent 258.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2020-07-20 17:57:07,775 WARN L193 SmtUtils]: Spent 243.00 ms on a formula simplification that was a NOOP. DAG size: 148 [2020-07-20 17:57:08,365 WARN L193 SmtUtils]: Spent 237.00 ms on a formula simplification that was a NOOP. DAG size: 142 [2020-07-20 17:57:09,117 WARN L193 SmtUtils]: Spent 244.00 ms on a formula simplification that was a NOOP. DAG size: 136 [2020-07-20 17:57:09,717 WARN L193 SmtUtils]: Spent 222.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2020-07-20 17:57:10,248 WARN L193 SmtUtils]: Spent 207.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2020-07-20 17:57:10,793 WARN L193 SmtUtils]: Spent 195.00 ms on a formula simplification that was a NOOP. DAG size: 118 [2020-07-20 17:57:11,312 WARN L193 SmtUtils]: Spent 191.00 ms on a formula simplification that was a NOOP. DAG size: 112 [2020-07-20 17:57:11,801 WARN L193 SmtUtils]: Spent 175.00 ms on a formula simplification that was a NOOP. DAG size: 106 [2020-07-20 17:57:12,288 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 100 [2020-07-20 17:57:12,748 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2020-07-20 17:57:13,197 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2020-07-20 17:57:13,637 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-20 17:57:14,052 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 76 [2020-07-20 17:57:18,072 WARN L193 SmtUtils]: Spent 401.00 ms on a formula simplification that was a NOOP. DAG size: 193 [2020-07-20 17:57:18,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:57:18,087 INFO L93 Difference]: Finished difference Result 82 states and 113 transitions. [2020-07-20 17:57:18,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2020-07-20 17:57:18,088 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 43 [2020-07-20 17:57:18,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:57:18,089 INFO L225 Difference]: With dead ends: 82 [2020-07-20 17:57:18,090 INFO L226 Difference]: Without dead ends: 76 [2020-07-20 17:57:18,095 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2296 ImplicationChecksByTransitivity, 22.9s TimeCoverageRelationStatistics Valid=4408, Invalid=13952, Unknown=0, NotChecked=0, Total=18360 [2020-07-20 17:57:18,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-07-20 17:57:18,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2020-07-20 17:57:18,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-20 17:57:18,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 76 transitions. [2020-07-20 17:57:18,119 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 76 transitions. Word has length 43 [2020-07-20 17:57:18,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:57:18,120 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 76 transitions. [2020-07-20 17:57:18,120 INFO L480 AbstractCegarLoop]: Interpolant automaton has 70 states. [2020-07-20 17:57:18,120 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 76 transitions. [2020-07-20 17:57:18,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-07-20 17:57:18,123 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:57:18,123 INFO L422 BasicCegarLoop]: trace histogram [63, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:57:18,337 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:57:18,338 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:57:18,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:57:18,338 INFO L82 PathProgramCache]: Analyzing trace with hash -1115480914, now seen corresponding path program 6 times [2020-07-20 17:57:18,339 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:57:18,339 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1999003268] [2020-07-20 17:57:18,339 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:57:18,422 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:57:18,423 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:57:18,429 WARN L261 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 260 conjunts are in the unsatisfiable core [2020-07-20 17:57:18,435 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:57:23,321 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-20 17:57:23,617 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 17:57:23,617 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:57:23,899 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:57:41,460 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 17:57:41,461 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1999003268] [2020-07-20 17:57:41,462 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:57:41,462 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69] total 134 [2020-07-20 17:57:41,462 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [819931737] [2020-07-20 17:57:41,463 INFO L459 AbstractCegarLoop]: Interpolant automaton has 134 states [2020-07-20 17:57:41,464 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:57:41,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 134 interpolants. [2020-07-20 17:57:41,471 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4238, Invalid=13584, Unknown=0, NotChecked=0, Total=17822 [2020-07-20 17:57:41,471 INFO L87 Difference]: Start difference. First operand 76 states and 76 transitions. Second operand 134 states. [2020-07-20 17:57:57,468 WARN L193 SmtUtils]: Spent 1.36 s on a formula simplification that was a NOOP. DAG size: 390 [2020-07-20 17:57:59,856 WARN L193 SmtUtils]: Spent 1.81 s on a formula simplification. DAG size of input: 391 DAG size of output: 264 [2020-07-20 17:58:03,692 WARN L193 SmtUtils]: Spent 1.64 s on a formula simplification that was a NOOP. DAG size: 382 [2020-07-20 17:58:05,892 WARN L193 SmtUtils]: Spent 1.79 s on a formula simplification. DAG size of input: 386 DAG size of output: 260 [2020-07-20 17:58:09,564 WARN L193 SmtUtils]: Spent 1.62 s on a formula simplification that was a NOOP. DAG size: 376 [2020-07-20 17:58:13,633 WARN L193 SmtUtils]: Spent 1.63 s on a formula simplification that was a NOOP. DAG size: 370 [2020-07-20 17:58:17,109 WARN L193 SmtUtils]: Spent 1.30 s on a formula simplification that was a NOOP. DAG size: 364 [2020-07-20 17:58:20,791 WARN L193 SmtUtils]: Spent 1.51 s on a formula simplification that was a NOOP. DAG size: 358 [2020-07-20 17:58:24,446 WARN L193 SmtUtils]: Spent 1.46 s on a formula simplification that was a NOOP. DAG size: 352 [2020-07-20 17:58:28,032 WARN L193 SmtUtils]: Spent 1.32 s on a formula simplification that was a NOOP. DAG size: 346 [2020-07-20 17:58:31,951 WARN L193 SmtUtils]: Spent 1.60 s on a formula simplification that was a NOOP. DAG size: 340 [2020-07-20 17:58:35,939 WARN L193 SmtUtils]: Spent 1.56 s on a formula simplification that was a NOOP. DAG size: 334 [2020-07-20 17:58:39,860 WARN L193 SmtUtils]: Spent 1.56 s on a formula simplification that was a NOOP. DAG size: 328 [2020-07-20 17:58:43,850 WARN L193 SmtUtils]: Spent 1.54 s on a formula simplification that was a NOOP. DAG size: 322 [2020-07-20 17:58:47,899 WARN L193 SmtUtils]: Spent 1.53 s on a formula simplification that was a NOOP. DAG size: 316 [2020-07-20 17:58:51,931 WARN L193 SmtUtils]: Spent 1.48 s on a formula simplification that was a NOOP. DAG size: 310 [2020-07-20 17:58:55,967 WARN L193 SmtUtils]: Spent 1.43 s on a formula simplification that was a NOOP. DAG size: 304 [2020-07-20 17:59:00,002 WARN L193 SmtUtils]: Spent 1.44 s on a formula simplification that was a NOOP. DAG size: 298 [2020-07-20 17:59:04,151 WARN L193 SmtUtils]: Spent 1.52 s on a formula simplification that was a NOOP. DAG size: 292 [2020-07-20 17:59:07,914 WARN L193 SmtUtils]: Spent 1.35 s on a formula simplification that was a NOOP. DAG size: 286 [2020-07-20 17:59:11,791 WARN L193 SmtUtils]: Spent 1.32 s on a formula simplification that was a NOOP. DAG size: 280 [2020-07-20 17:59:15,668 WARN L193 SmtUtils]: Spent 1.26 s on a formula simplification that was a NOOP. DAG size: 274 [2020-07-20 17:59:19,424 WARN L193 SmtUtils]: Spent 1.14 s on a formula simplification that was a NOOP. DAG size: 268 [2020-07-20 17:59:23,631 WARN L193 SmtUtils]: Spent 1.38 s on a formula simplification that was a NOOP. DAG size: 262 [2020-07-20 17:59:27,867 WARN L193 SmtUtils]: Spent 1.36 s on a formula simplification that was a NOOP. DAG size: 256 [2020-07-20 17:59:32,162 WARN L193 SmtUtils]: Spent 1.34 s on a formula simplification that was a NOOP. DAG size: 250 [2020-07-20 17:59:36,537 WARN L193 SmtUtils]: Spent 1.37 s on a formula simplification that was a NOOP. DAG size: 244 [2020-07-20 17:59:40,648 WARN L193 SmtUtils]: Spent 1.31 s on a formula simplification that was a NOOP. DAG size: 238 [2020-07-20 17:59:44,966 WARN L193 SmtUtils]: Spent 1.26 s on a formula simplification that was a NOOP. DAG size: 232 [2020-07-20 17:59:49,290 WARN L193 SmtUtils]: Spent 1.22 s on a formula simplification that was a NOOP. DAG size: 226 [2020-07-20 17:59:53,638 WARN L193 SmtUtils]: Spent 1.20 s on a formula simplification that was a NOOP. DAG size: 220 [2020-07-20 17:59:58,019 WARN L193 SmtUtils]: Spent 1.20 s on a formula simplification that was a NOOP. DAG size: 214 [2020-07-20 18:00:02,421 WARN L193 SmtUtils]: Spent 1.24 s on a formula simplification that was a NOOP. DAG size: 208 [2020-07-20 18:00:06,886 WARN L193 SmtUtils]: Spent 1.14 s on a formula simplification that was a NOOP. DAG size: 202 [2020-07-20 18:00:10,784 WARN L193 SmtUtils]: Spent 1.06 s on a formula simplification that was a NOOP. DAG size: 196 [2020-07-20 18:00:14,631 WARN L193 SmtUtils]: Spent 1000.00 ms on a formula simplification that was a NOOP. DAG size: 190 [2020-07-20 18:00:18,568 WARN L193 SmtUtils]: Spent 1.01 s on a formula simplification that was a NOOP. DAG size: 184 [2020-07-20 18:00:22,562 WARN L193 SmtUtils]: Spent 1.05 s on a formula simplification that was a NOOP. DAG size: 178 [2020-07-20 18:00:26,475 WARN L193 SmtUtils]: Spent 1.08 s on a formula simplification that was a NOOP. DAG size: 172 [2020-07-20 18:00:30,535 WARN L193 SmtUtils]: Spent 983.00 ms on a formula simplification that was a NOOP. DAG size: 166 [2020-07-20 18:00:34,563 WARN L193 SmtUtils]: Spent 977.00 ms on a formula simplification that was a NOOP. DAG size: 160 [2020-07-20 18:00:38,468 WARN L193 SmtUtils]: Spent 979.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2020-07-20 18:00:42,265 WARN L193 SmtUtils]: Spent 865.00 ms on a formula simplification that was a NOOP. DAG size: 148 [2020-07-20 18:00:46,005 WARN L193 SmtUtils]: Spent 837.00 ms on a formula simplification that was a NOOP. DAG size: 142 [2020-07-20 18:00:49,704 WARN L193 SmtUtils]: Spent 831.00 ms on a formula simplification that was a NOOP. DAG size: 136 [2020-07-20 18:00:53,312 WARN L193 SmtUtils]: Spent 800.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2020-07-20 18:00:56,838 WARN L193 SmtUtils]: Spent 696.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2020-07-20 18:01:00,201 WARN L193 SmtUtils]: Spent 720.00 ms on a formula simplification that was a NOOP. DAG size: 118 [2020-07-20 18:01:03,526 WARN L193 SmtUtils]: Spent 658.00 ms on a formula simplification that was a NOOP. DAG size: 112 [2020-07-20 18:01:06,627 WARN L193 SmtUtils]: Spent 596.00 ms on a formula simplification that was a NOOP. DAG size: 106 [2020-07-20 18:01:09,701 WARN L193 SmtUtils]: Spent 604.00 ms on a formula simplification that was a NOOP. DAG size: 100 [2020-07-20 18:01:12,667 WARN L193 SmtUtils]: Spent 567.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2020-07-20 18:01:15,511 WARN L193 SmtUtils]: Spent 486.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2020-07-20 18:01:18,210 WARN L193 SmtUtils]: Spent 432.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-20 18:01:20,509 WARN L193 SmtUtils]: Spent 357.00 ms on a formula simplification that was a NOOP. DAG size: 76 [2020-07-20 18:01:22,590 WARN L193 SmtUtils]: Spent 325.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 18:01:24,099 WARN L193 SmtUtils]: Spent 284.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 18:01:25,873 WARN L193 SmtUtils]: Spent 248.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 18:01:27,588 WARN L193 SmtUtils]: Spent 225.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-20 18:01:29,171 WARN L193 SmtUtils]: Spent 204.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 18:01:30,643 WARN L193 SmtUtils]: Spent 169.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 18:01:31,988 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-20 18:01:33,423 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2020-07-20 18:01:47,703 WARN L193 SmtUtils]: Spent 3.40 s on a formula simplification that was a NOOP. DAG size: 385 [2020-07-20 18:01:47,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:01:47,741 INFO L93 Difference]: Finished difference Result 146 states and 209 transitions. [2020-07-20 18:01:47,746 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 134 states. [2020-07-20 18:01:47,747 INFO L78 Accepts]: Start accepts. Automaton has 134 states. Word has length 75 [2020-07-20 18:01:47,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:01:47,750 INFO L225 Difference]: With dead ends: 146 [2020-07-20 18:01:47,750 INFO L226 Difference]: Without dead ends: 140 [2020-07-20 18:01:47,761 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 262 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8696 ImplicationChecksByTransitivity, 256.9s TimeCoverageRelationStatistics Valid=16984, Invalid=52448, Unknown=0, NotChecked=0, Total=69432 [2020-07-20 18:01:47,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2020-07-20 18:01:47,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 140. [2020-07-20 18:01:47,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2020-07-20 18:01:47,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 140 transitions. [2020-07-20 18:01:47,836 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 140 transitions. Word has length 75 [2020-07-20 18:01:47,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:01:47,837 INFO L479 AbstractCegarLoop]: Abstraction has 140 states and 140 transitions. [2020-07-20 18:01:47,837 INFO L480 AbstractCegarLoop]: Interpolant automaton has 134 states. [2020-07-20 18:01:47,838 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 140 transitions. [2020-07-20 18:01:47,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2020-07-20 18:01:47,844 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:01:47,844 INFO L422 BasicCegarLoop]: trace histogram [127, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:01:48,057 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:01:48,059 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:01:48,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:01:48,060 INFO L82 PathProgramCache]: Analyzing trace with hash -858019666, now seen corresponding path program 7 times [2020-07-20 18:01:48,060 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:01:48,061 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1360499222] [2020-07-20 18:01:48,061 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 18:01:48,246 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 18:01:48,247 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:01:48,275 WARN L261 TraceCheckSpWp]: Trace formula consists of 670 conjuncts, 516 conjunts are in the unsatisfiable core [2020-07-20 18:01:48,286 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:02:35,321 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-20 18:02:37,131 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 18:02:37,131 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:02:38,897 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 18:05:52,451 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 18:05:52,452 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1360499222] [2020-07-20 18:05:52,452 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 18:05:52,452 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [133, 133] total 262 [2020-07-20 18:05:52,452 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [933759300] [2020-07-20 18:05:52,453 INFO L459 AbstractCegarLoop]: Interpolant automaton has 262 states [2020-07-20 18:05:52,454 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:05:52,458 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 262 interpolants. [2020-07-20 18:05:52,461 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16654, Invalid=51728, Unknown=0, NotChecked=0, Total=68382 [2020-07-20 18:05:52,462 INFO L87 Difference]: Start difference. First operand 140 states and 140 transitions. Second operand 262 states. [2020-07-20 18:08:37,089 WARN L193 SmtUtils]: Spent 7.61 s on a formula simplification that was a NOOP. DAG size: 774 [2020-07-20 18:08:49,483 WARN L193 SmtUtils]: Spent 10.02 s on a formula simplification. DAG size of input: 775 DAG size of output: 520 [2020-07-20 18:09:46,374 WARN L193 SmtUtils]: Spent 9.55 s on a formula simplification that was a NOOP. DAG size: 766 [2020-07-20 18:09:57,416 WARN L193 SmtUtils]: Spent 9.52 s on a formula simplification. DAG size of input: 770 DAG size of output: 516 [2020-07-20 18:10:53,528 WARN L193 SmtUtils]: Spent 9.55 s on a formula simplification that was a NOOP. DAG size: 760