/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 BIGGEST_EQUIVALENCE_CLASS --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-acceleration/array_3-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 23:12:19,005 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 23:12:19,008 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 23:12:19,020 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 23:12:19,021 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 23:12:19,022 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 23:12:19,023 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 23:12:19,025 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 23:12:19,027 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 23:12:19,028 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 23:12:19,029 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 23:12:19,030 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 23:12:19,030 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 23:12:19,031 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 23:12:19,032 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 23:12:19,033 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 23:12:19,034 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 23:12:19,035 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 23:12:19,037 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 23:12:19,039 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 23:12:19,040 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 23:12:19,041 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 23:12:19,042 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 23:12:19,043 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 23:12:19,046 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 23:12:19,054 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 23:12:19,055 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 23:12:19,056 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 23:12:19,056 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 23:12:19,071 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 23:12:19,072 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 23:12:19,073 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 23:12:19,073 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 23:12:19,073 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 23:12:19,073 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 23:12:19,074 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 23:12:19,074 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 23:12:19,074 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 23:12:19,074 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 23:12:19,074 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 23:12:19,075 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 23:12:19,075 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 23:12:19,075 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 23:12:19,075 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 23:12:19,075 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 23:12:19,076 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 23:12:19,076 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 23:12:19,076 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 23:12:19,076 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 23:12:19,076 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 23:12:19,077 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 23:12:19,077 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 23:12:19,077 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 23:12:19,077 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 23:12:19,077 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 23:12:19,078 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:12:19,078 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 23:12:19,078 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 23:12:19,078 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 -> BIGGEST_EQUIVALENCE_CLASS 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 [2020-07-21 23:12:19,374 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 23:12:19,389 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 23:12:19,392 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 23:12:19,394 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 23:12:19,396 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 23:12:19,398 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_3-1.i [2020-07-21 23:12:19,474 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1f3a8613c/019b72f9cb084cf6aaa5ff1e05f57537/FLAG68eac3f7e [2020-07-21 23:12:19,968 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 23:12:19,969 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_3-1.i [2020-07-21 23:12:19,976 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1f3a8613c/019b72f9cb084cf6aaa5ff1e05f57537/FLAG68eac3f7e [2020-07-21 23:12:20,345 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1f3a8613c/019b72f9cb084cf6aaa5ff1e05f57537 [2020-07-21 23:12:20,359 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 23:12:20,363 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 23:12:20,369 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 23:12:20,370 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 23:12:20,374 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 23:12:20,375 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:12:20" (1/1) ... [2020-07-21 23:12:20,379 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7f6bf434 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:12:20, skipping insertion in model container [2020-07-21 23:12:20,380 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:12:20" (1/1) ... [2020-07-21 23:12:20,389 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 23:12:20,407 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 23:12:20,573 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 23:12:20,577 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 23:12:20,595 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 23:12:20,610 INFO L208 MainTranslator]: Completed translation [2020-07-21 23:12:20,611 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:12:20 WrapperNode [2020-07-21 23:12:20,611 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 23:12:20,612 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 23:12:20,612 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 23:12:20,612 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 23:12:20,706 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:12:20" (1/1) ... [2020-07-21 23:12:20,706 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:12:20" (1/1) ... [2020-07-21 23:12:20,714 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:12:20" (1/1) ... [2020-07-21 23:12:20,715 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:12:20" (1/1) ... [2020-07-21 23:12:20,720 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:12:20" (1/1) ... [2020-07-21 23:12:20,726 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:12:20" (1/1) ... [2020-07-21 23:12:20,727 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:12:20" (1/1) ... [2020-07-21 23:12:20,729 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 23:12:20,729 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 23:12:20,729 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 23:12:20,730 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 23:12:20,730 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:12:20" (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 23:12:20,801 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 23:12:20,801 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 23:12:20,801 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 23:12:20,801 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 23:12:20,802 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 23:12:20,803 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 23:12:20,803 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 23:12:20,803 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 23:12:20,804 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-21 23:12:20,804 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-21 23:12:20,805 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-21 23:12:20,805 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-21 23:12:20,805 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 23:12:20,805 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 23:12:21,037 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 23:12:21,037 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-07-21 23:12:21,041 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:12:21 BoogieIcfgContainer [2020-07-21 23:12:21,041 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 23:12:21,042 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 23:12:21,042 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 23:12:21,046 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 23:12:21,046 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 11:12:20" (1/3) ... [2020-07-21 23:12:21,047 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@688a9391 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:12:21, skipping insertion in model container [2020-07-21 23:12:21,047 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:12:20" (2/3) ... [2020-07-21 23:12:21,047 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@688a9391 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:12:21, skipping insertion in model container [2020-07-21 23:12:21,048 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:12:21" (3/3) ... [2020-07-21 23:12:21,049 INFO L109 eAbstractionObserver]: Analyzing ICFG array_3-1.i [2020-07-21 23:12:21,061 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 23:12:21,068 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 23:12:21,082 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 23:12:21,106 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 23:12:21,106 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 23:12:21,107 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 23:12:21,107 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 23:12:21,107 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 23:12:21,107 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 23:12:21,107 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 23:12:21,107 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 23:12:21,128 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-07-21 23:12:21,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 23:12:21,134 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:12:21,135 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:12:21,136 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:12:21,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:12:21,142 INFO L82 PathProgramCache]: Analyzing trace with hash -413900697, now seen corresponding path program 1 times [2020-07-21 23:12:21,150 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:12:21,150 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2078111073] [2020-07-21 23:12:21,151 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 [2020-07-21 23:12:21,287 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:12:21,288 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:12:21,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-21 23:12:21,297 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:12:21,321 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 23:12:21,322 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:12:21,325 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2078111073] [2020-07-21 23:12:21,326 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:12:21,326 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-21 23:12:21,327 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1175571790] [2020-07-21 23:12:21,345 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-21 23:12:21,346 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:12:21,359 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-21 23:12:21,360 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 23:12:21,362 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 2 states. [2020-07-21 23:12:21,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:12:21,387 INFO L93 Difference]: Finished difference Result 42 states and 51 transitions. [2020-07-21 23:12:21,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-21 23:12:21,388 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 13 [2020-07-21 23:12:21,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:12:21,395 INFO L225 Difference]: With dead ends: 42 [2020-07-21 23:12:21,396 INFO L226 Difference]: Without dead ends: 18 [2020-07-21 23:12:21,399 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 23:12:21,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-21 23:12:21,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-21 23:12:21,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-21 23:12:21,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-07-21 23:12:21,431 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 13 [2020-07-21 23:12:21,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:12:21,431 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-07-21 23:12:21,431 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-21 23:12:21,432 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-07-21 23:12:21,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 23:12:21,433 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:12:21,433 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:12:21,634 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:12:21,635 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:12:21,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:12:21,636 INFO L82 PathProgramCache]: Analyzing trace with hash 2053026861, now seen corresponding path program 1 times [2020-07-21 23:12:21,637 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:12:21,637 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [87167883] [2020-07-21 23:12:21,638 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 [2020-07-21 23:12:21,688 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:12:21,695 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:12:21,696 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:12:21,698 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:12:21,721 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 23:12:21,721 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:12:21,721 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [87167883] [2020-07-21 23:12:21,722 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:12:21,722 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:12:21,722 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1180382584] [2020-07-21 23:12:21,724 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:12:21,724 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:12:21,725 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:12:21,725 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:12:21,725 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 3 states. [2020-07-21 23:12:21,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:12:21,767 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-21 23:12:21,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:12:21,768 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2020-07-21 23:12:21,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:12:21,770 INFO L225 Difference]: With dead ends: 35 [2020-07-21 23:12:21,771 INFO L226 Difference]: Without dead ends: 25 [2020-07-21 23:12:21,772 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:12:21,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-07-21 23:12:21,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 22. [2020-07-21 23:12:21,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-07-21 23:12:21,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2020-07-21 23:12:21,781 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 14 [2020-07-21 23:12:21,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:12:21,782 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2020-07-21 23:12:21,782 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:12:21,782 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2020-07-21 23:12:21,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-21 23:12:21,783 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:12:21,783 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:12:21,997 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:12:21,998 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:12:21,999 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:12:21,999 INFO L82 PathProgramCache]: Analyzing trace with hash 1766388751, now seen corresponding path program 1 times [2020-07-21 23:12:22,000 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:12:22,001 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1286983726] [2020-07-21 23:12:22,001 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 [2020-07-21 23:12:22,054 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 23:12:22,055 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:12:22,056 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 23:12:22,058 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:12:22,083 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 23:12:22,083 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:12:22,120 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 23:12:22,120 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1286983726] [2020-07-21 23:12:22,121 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:12:22,121 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-07-21 23:12:22,121 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1080790010] [2020-07-21 23:12:22,122 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 23:12:22,122 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:12:22,123 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 23:12:22,123 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-21 23:12:22,124 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand 6 states. [2020-07-21 23:12:22,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:12:22,203 INFO L93 Difference]: Finished difference Result 52 states and 64 transitions. [2020-07-21 23:12:22,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 23:12:22,204 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-07-21 23:12:22,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:12:22,205 INFO L225 Difference]: With dead ends: 52 [2020-07-21 23:12:22,206 INFO L226 Difference]: Without dead ends: 39 [2020-07-21 23:12:22,206 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-21 23:12:22,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-07-21 23:12:22,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 36. [2020-07-21 23:12:22,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 23:12:22,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2020-07-21 23:12:22,215 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 16 [2020-07-21 23:12:22,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:12:22,215 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2020-07-21 23:12:22,216 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 23:12:22,216 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2020-07-21 23:12:22,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 23:12:22,217 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:12:22,217 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:12:22,430 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:12:22,431 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:12:22,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:12:22,432 INFO L82 PathProgramCache]: Analyzing trace with hash 671453365, now seen corresponding path program 2 times [2020-07-21 23:12:22,432 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:12:22,432 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2017629033] [2020-07-21 23:12:22,433 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 [2020-07-21 23:12:22,501 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 23:12:22,502 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:12:22,503 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 23:12:22,505 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:12:22,564 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:12:22,565 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:12:22,672 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:12:22,673 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2017629033] [2020-07-21 23:12:22,673 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:12:22,673 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-21 23:12:22,673 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1479744505] [2020-07-21 23:12:22,674 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 23:12:22,674 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:12:22,674 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 23:12:22,675 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-07-21 23:12:22,675 INFO L87 Difference]: Start difference. First operand 36 states and 41 transitions. Second operand 12 states. [2020-07-21 23:12:22,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:12:22,831 INFO L93 Difference]: Finished difference Result 102 states and 129 transitions. [2020-07-21 23:12:22,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 23:12:22,831 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 22 [2020-07-21 23:12:22,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:12:22,833 INFO L225 Difference]: With dead ends: 102 [2020-07-21 23:12:22,833 INFO L226 Difference]: Without dead ends: 81 [2020-07-21 23:12:22,834 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-07-21 23:12:22,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-07-21 23:12:22,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 72. [2020-07-21 23:12:22,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-07-21 23:12:22,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 83 transitions. [2020-07-21 23:12:22,847 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 83 transitions. Word has length 22 [2020-07-21 23:12:22,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:12:22,848 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 83 transitions. [2020-07-21 23:12:22,848 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 23:12:22,848 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 83 transitions. [2020-07-21 23:12:22,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-07-21 23:12:22,849 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:12:22,849 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:12:23,063 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:12:23,064 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:12:23,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:12:23,066 INFO L82 PathProgramCache]: Analyzing trace with hash -1999606655, now seen corresponding path program 3 times [2020-07-21 23:12:23,067 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:12:23,067 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [112106103] [2020-07-21 23:12:23,067 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 [2020-07-21 23:12:23,124 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 23:12:23,124 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:12:23,126 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 23:12:23,128 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:12:23,279 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:12:23,279 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:12:23,552 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:12:23,553 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [112106103] [2020-07-21 23:12:23,553 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:12:23,553 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 24 [2020-07-21 23:12:23,554 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1127059257] [2020-07-21 23:12:23,555 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 23:12:23,555 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:12:23,556 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 23:12:23,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-07-21 23:12:23,557 INFO L87 Difference]: Start difference. First operand 72 states and 83 transitions. Second operand 24 states. [2020-07-21 23:12:23,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:12:23,973 INFO L93 Difference]: Finished difference Result 210 states and 267 transitions. [2020-07-21 23:12:23,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-21 23:12:23,974 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 34 [2020-07-21 23:12:23,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:12:23,978 INFO L225 Difference]: With dead ends: 210 [2020-07-21 23:12:23,978 INFO L226 Difference]: Without dead ends: 165 [2020-07-21 23:12:23,981 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-07-21 23:12:23,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2020-07-21 23:12:24,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 144. [2020-07-21 23:12:24,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2020-07-21 23:12:24,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 167 transitions. [2020-07-21 23:12:24,019 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 167 transitions. Word has length 34 [2020-07-21 23:12:24,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:12:24,020 INFO L479 AbstractCegarLoop]: Abstraction has 144 states and 167 transitions. [2020-07-21 23:12:24,020 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 23:12:24,020 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 167 transitions. [2020-07-21 23:12:24,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-07-21 23:12:24,037 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:12:24,037 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:12:24,239 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:12:24,240 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:12:24,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:12:24,240 INFO L82 PathProgramCache]: Analyzing trace with hash -54841831, now seen corresponding path program 4 times [2020-07-21 23:12:24,240 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:12:24,241 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1529036067] [2020-07-21 23:12:24,241 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 [2020-07-21 23:12:24,476 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:12:24,476 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:12:24,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 23:12:24,483 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:12:24,864 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:12:24,864 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:12:25,728 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:12:25,729 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1529036067] [2020-07-21 23:12:25,729 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:12:25,729 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 48 [2020-07-21 23:12:25,730 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [529650900] [2020-07-21 23:12:25,730 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-07-21 23:12:25,730 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:12:25,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-07-21 23:12:25,733 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2020-07-21 23:12:25,733 INFO L87 Difference]: Start difference. First operand 144 states and 167 transitions. Second operand 48 states. [2020-07-21 23:12:26,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:12:26,403 INFO L93 Difference]: Finished difference Result 426 states and 543 transitions. [2020-07-21 23:12:26,405 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-21 23:12:26,406 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 58 [2020-07-21 23:12:26,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:12:26,409 INFO L225 Difference]: With dead ends: 426 [2020-07-21 23:12:26,411 INFO L226 Difference]: Without dead ends: 333 [2020-07-21 23:12:26,414 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2020-07-21 23:12:26,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 333 states. [2020-07-21 23:12:26,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 333 to 288. [2020-07-21 23:12:26,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 288 states. [2020-07-21 23:12:26,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 335 transitions. [2020-07-21 23:12:26,463 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 335 transitions. Word has length 58 [2020-07-21 23:12:26,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:12:26,463 INFO L479 AbstractCegarLoop]: Abstraction has 288 states and 335 transitions. [2020-07-21 23:12:26,464 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-07-21 23:12:26,464 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 335 transitions. [2020-07-21 23:12:26,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-07-21 23:12:26,466 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:12:26,467 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:12:26,667 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:12:26,668 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:12:26,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:12:26,669 INFO L82 PathProgramCache]: Analyzing trace with hash 1746458953, now seen corresponding path program 5 times [2020-07-21 23:12:26,669 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:12:26,670 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1042377898] [2020-07-21 23:12:26,670 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 [2020-07-21 23:12:27,852 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:12:27,853 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:12:27,861 INFO L263 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 48 conjunts are in the unsatisfiable core [2020-07-21 23:12:27,866 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:12:29,084 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:12:29,085 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:12:32,585 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:12:32,585 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1042377898] [2020-07-21 23:12:32,586 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:12:32,586 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49] total 96 [2020-07-21 23:12:32,586 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [799658925] [2020-07-21 23:12:32,587 INFO L459 AbstractCegarLoop]: Interpolant automaton has 96 states [2020-07-21 23:12:32,587 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:12:32,588 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2020-07-21 23:12:32,592 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2020-07-21 23:12:32,593 INFO L87 Difference]: Start difference. First operand 288 states and 335 transitions. Second operand 96 states. [2020-07-21 23:12:35,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:12:35,396 INFO L93 Difference]: Finished difference Result 858 states and 1095 transitions. [2020-07-21 23:12:35,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2020-07-21 23:12:35,397 INFO L78 Accepts]: Start accepts. Automaton has 96 states. Word has length 106 [2020-07-21 23:12:35,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:12:35,405 INFO L225 Difference]: With dead ends: 858 [2020-07-21 23:12:35,406 INFO L226 Difference]: Without dead ends: 669 [2020-07-21 23:12:35,415 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2020-07-21 23:12:35,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 669 states. [2020-07-21 23:12:35,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 669 to 576. [2020-07-21 23:12:35,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 576 states. [2020-07-21 23:12:35,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 576 states to 576 states and 671 transitions. [2020-07-21 23:12:35,458 INFO L78 Accepts]: Start accepts. Automaton has 576 states and 671 transitions. Word has length 106 [2020-07-21 23:12:35,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:12:35,462 INFO L479 AbstractCegarLoop]: Abstraction has 576 states and 671 transitions. [2020-07-21 23:12:35,462 INFO L480 AbstractCegarLoop]: Interpolant automaton has 96 states. [2020-07-21 23:12:35,464 INFO L276 IsEmpty]: Start isEmpty. Operand 576 states and 671 transitions. [2020-07-21 23:12:35,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 203 [2020-07-21 23:12:35,471 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:12:35,471 INFO L422 BasicCegarLoop]: trace histogram [94, 94, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:12:35,691 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:12:35,692 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:12:35,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:12:35,692 INFO L82 PathProgramCache]: Analyzing trace with hash 982831017, now seen corresponding path program 6 times [2020-07-21 23:12:35,693 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:12:35,693 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1477486016] [2020-07-21 23:12:35,694 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 [2020-07-21 23:14:22,853 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:14:22,854 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:14:23,706 INFO L263 TraceCheckSpWp]: Trace formula consists of 618 conjuncts, 96 conjunts are in the unsatisfiable core [2020-07-21 23:14:23,719 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:14:28,240 INFO L134 CoverageAnalysis]: Checked inductivity of 8836 backedges. 0 proven. 8836 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:14:28,240 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:14:41,891 INFO L134 CoverageAnalysis]: Checked inductivity of 8836 backedges. 0 proven. 8836 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:14:41,891 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1477486016] [2020-07-21 23:14:41,891 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:14:41,892 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97] total 192 [2020-07-21 23:14:41,892 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [291276235] [2020-07-21 23:14:41,894 INFO L459 AbstractCegarLoop]: Interpolant automaton has 192 states [2020-07-21 23:14:41,894 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:14:41,897 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 192 interpolants. [2020-07-21 23:14:41,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18336, Invalid=18336, Unknown=0, NotChecked=0, Total=36672 [2020-07-21 23:14:41,906 INFO L87 Difference]: Start difference. First operand 576 states and 671 transitions. Second operand 192 states. [2020-07-21 23:15:03,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:15:03,463 INFO L93 Difference]: Finished difference Result 1722 states and 2199 transitions. [2020-07-21 23:15:03,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 192 states. [2020-07-21 23:15:03,464 INFO L78 Accepts]: Start accepts. Automaton has 192 states. Word has length 202 [2020-07-21 23:15:03,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:15:03,471 INFO L225 Difference]: With dead ends: 1722 [2020-07-21 23:15:03,471 INFO L226 Difference]: Without dead ends: 1341 [2020-07-21 23:15:03,476 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 403 GetRequests, 213 SyntacticMatches, 0 SemanticMatches, 190 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 17.9s TimeCoverageRelationStatistics Valid=18336, Invalid=18336, Unknown=0, NotChecked=0, Total=36672 [2020-07-21 23:15:03,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1341 states. [2020-07-21 23:15:03,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1341 to 1152. [2020-07-21 23:15:03,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1152 states. [2020-07-21 23:15:03,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1152 states to 1152 states and 1343 transitions. [2020-07-21 23:15:03,513 INFO L78 Accepts]: Start accepts. Automaton has 1152 states and 1343 transitions. Word has length 202 [2020-07-21 23:15:03,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:15:03,514 INFO L479 AbstractCegarLoop]: Abstraction has 1152 states and 1343 transitions. [2020-07-21 23:15:03,514 INFO L480 AbstractCegarLoop]: Interpolant automaton has 192 states. [2020-07-21 23:15:03,514 INFO L276 IsEmpty]: Start isEmpty. Operand 1152 states and 1343 transitions. [2020-07-21 23:15:03,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 395 [2020-07-21 23:15:03,519 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:15:03,520 INFO L422 BasicCegarLoop]: trace histogram [190, 190, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:15:03,720 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:15:03,721 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:15:03,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:15:03,721 INFO L82 PathProgramCache]: Analyzing trace with hash -74498967, now seen corresponding path program 7 times [2020-07-21 23:15:03,721 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:15:03,722 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [43774202] [2020-07-21 23:15:03,722 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 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in