/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 DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/ldv-regression/test25-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 21:53:21,981 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 21:53:21,984 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 21:53:22,012 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 21:53:22,012 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 21:53:22,016 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 21:53:22,018 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 21:53:22,021 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 21:53:22,028 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 21:53:22,031 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 21:53:22,038 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 21:53:22,039 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 21:53:22,040 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 21:53:22,042 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 21:53:22,046 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 21:53:22,049 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 21:53:22,050 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 21:53:22,052 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 21:53:22,054 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 21:53:22,056 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 21:53:22,058 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 21:53:22,059 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 21:53:22,062 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 21:53:22,063 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 21:53:22,066 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 21:53:22,079 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 21:53:22,081 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 21:53:22,083 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 21:53:22,084 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 21:53:22,106 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 21:53:22,107 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 21:53:22,109 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 21:53:22,110 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 21:53:22,110 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 21:53:22,110 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 21:53:22,110 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 21:53:22,111 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 21:53:22,111 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 21:53:22,111 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 21:53:22,111 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 21:53:22,112 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 21:53:22,112 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 21:53:22,112 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 21:53:22,112 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 21:53:22,112 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 21:53:22,113 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 21:53:22,113 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 21:53:22,113 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 21:53:22,113 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 21:53:22,114 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 21:53:22,114 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 21:53:22,114 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 21:53:22,114 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 21:53:22,115 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 21:53:22,115 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 21:53:22,115 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:53:22,115 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 21:53:22,116 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 21:53:22,116 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 -> DAGSIZE 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 21:53:22,525 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 21:53:22,561 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 21:53:22,571 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 21:53:22,573 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 21:53:22,574 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 21:53:22,576 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-regression/test25-2.c [2020-07-20 21:53:22,696 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5c3fe51b6/1c4bab72767f46c79a33b874a0b683ea/FLAG87bea90c8 [2020-07-20 21:53:23,440 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 21:53:23,442 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/ldv-regression/test25-2.c [2020-07-20 21:53:23,458 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5c3fe51b6/1c4bab72767f46c79a33b874a0b683ea/FLAG87bea90c8 [2020-07-20 21:53:23,700 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5c3fe51b6/1c4bab72767f46c79a33b874a0b683ea [2020-07-20 21:53:23,716 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 21:53:23,721 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 21:53:23,723 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 21:53:23,724 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 21:53:23,730 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 21:53:23,733 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:53:23" (1/1) ... [2020-07-20 21:53:23,739 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6f2c9fc5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:53:23, skipping insertion in model container [2020-07-20 21:53:23,740 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:53:23" (1/1) ... [2020-07-20 21:53:23,755 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 21:53:23,786 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 21:53:24,136 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 21:53:24,157 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 21:53:24,194 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 21:53:24,367 INFO L208 MainTranslator]: Completed translation [2020-07-20 21:53:24,368 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:53:24 WrapperNode [2020-07-20 21:53:24,369 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 21:53:24,371 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 21:53:24,371 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 21:53:24,371 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 21:53:24,392 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:53:24" (1/1) ... [2020-07-20 21:53:24,392 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:53:24" (1/1) ... [2020-07-20 21:53:24,408 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:53:24" (1/1) ... [2020-07-20 21:53:24,410 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:53:24" (1/1) ... [2020-07-20 21:53:24,426 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:53:24" (1/1) ... [2020-07-20 21:53:24,437 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:53:24" (1/1) ... [2020-07-20 21:53:24,440 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:53:24" (1/1) ... [2020-07-20 21:53:24,445 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 21:53:24,446 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 21:53:24,446 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 21:53:24,446 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 21:53:24,448 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:53:24" (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 21:53:24,555 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 21:53:24,556 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 21:53:24,556 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2020-07-20 21:53:24,556 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 21:53:24,556 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 21:53:24,558 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 21:53:24,558 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-07-20 21:53:24,558 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-07-20 21:53:24,558 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-20 21:53:24,558 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 21:53:24,558 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-20 21:53:24,558 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-20 21:53:24,559 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-07-20 21:53:24,559 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-20 21:53:24,559 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 21:53:24,559 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 21:53:25,049 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 21:53:25,049 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-07-20 21:53:25,053 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:53:25 BoogieIcfgContainer [2020-07-20 21:53:25,053 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 21:53:25,054 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 21:53:25,055 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 21:53:25,065 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 21:53:25,066 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 09:53:23" (1/3) ... [2020-07-20 21:53:25,068 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3115f87e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:53:25, skipping insertion in model container [2020-07-20 21:53:25,075 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:53:24" (2/3) ... [2020-07-20 21:53:25,076 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3115f87e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:53:25, skipping insertion in model container [2020-07-20 21:53:25,077 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:53:25" (3/3) ... [2020-07-20 21:53:25,079 INFO L109 eAbstractionObserver]: Analyzing ICFG test25-2.c [2020-07-20 21:53:25,093 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 21:53:25,104 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 21:53:25,124 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 21:53:25,157 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 21:53:25,157 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 21:53:25,157 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 21:53:25,157 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 21:53:25,157 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 21:53:25,158 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 21:53:25,158 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 21:53:25,158 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 21:53:25,186 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-07-20 21:53:25,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-20 21:53:25,198 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:53:25,200 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:53:25,202 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:53:25,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:53:25,212 INFO L82 PathProgramCache]: Analyzing trace with hash -899836778, now seen corresponding path program 1 times [2020-07-20 21:53:25,226 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:53:25,227 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [104851841] [2020-07-20 21:53:25,228 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 21:53:25,425 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:53:25,426 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:53:25,432 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-20 21:53:25,441 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:53:25,477 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 21:53:25,478 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:53:25,480 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [104851841] [2020-07-20 21:53:25,481 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:53:25,482 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-20 21:53:25,484 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1154476940] [2020-07-20 21:53:25,494 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-20 21:53:25,495 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:53:25,516 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-20 21:53:25,518 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 21:53:25,522 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 2 states. [2020-07-20 21:53:25,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:53:25,562 INFO L93 Difference]: Finished difference Result 42 states and 52 transitions. [2020-07-20 21:53:25,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-20 21:53:25,564 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2020-07-20 21:53:25,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:53:25,579 INFO L225 Difference]: With dead ends: 42 [2020-07-20 21:53:25,580 INFO L226 Difference]: Without dead ends: 20 [2020-07-20 21:53:25,586 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 21:53:25,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-07-20 21:53:25,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-07-20 21:53:25,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-07-20 21:53:25,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2020-07-20 21:53:25,660 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2020-07-20 21:53:25,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:53:25,661 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2020-07-20 21:53:25,662 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-20 21:53:25,662 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2020-07-20 21:53:25,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-20 21:53:25,663 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:53:25,663 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:53:25,865 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:53:25,867 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:53:25,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:53:25,868 INFO L82 PathProgramCache]: Analyzing trace with hash -1137678901, now seen corresponding path program 1 times [2020-07-20 21:53:25,869 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:53:25,869 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1931407987] [2020-07-20 21:53:25,870 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 21:53:26,012 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:53:26,016 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:53:26,019 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 21:53:26,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:53:26,070 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 21:53:26,071 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:53:26,072 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1931407987] [2020-07-20 21:53:26,073 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:53:26,073 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 21:53:26,074 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [258618571] [2020-07-20 21:53:26,077 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 21:53:26,077 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:53:26,078 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 21:53:26,079 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:53:26,079 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 3 states. [2020-07-20 21:53:26,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:53:26,119 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2020-07-20 21:53:26,121 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 21:53:26,121 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-20 21:53:26,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:53:26,123 INFO L225 Difference]: With dead ends: 34 [2020-07-20 21:53:26,124 INFO L226 Difference]: Without dead ends: 22 [2020-07-20 21:53:26,126 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:53:26,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-07-20 21:53:26,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-07-20 21:53:26,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 21:53:26,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-07-20 21:53:26,137 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 18 [2020-07-20 21:53:26,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:53:26,138 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-07-20 21:53:26,138 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 21:53:26,138 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-07-20 21:53:26,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 21:53:26,140 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:53:26,140 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:53:26,354 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:53:26,355 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:53:26,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:53:26,356 INFO L82 PathProgramCache]: Analyzing trace with hash 278779309, now seen corresponding path program 1 times [2020-07-20 21:53:26,357 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:53:26,357 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [870592601] [2020-07-20 21:53:26,358 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 21:53:26,490 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:53:26,491 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:53:26,494 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 21:53:26,498 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:53:26,532 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 21:53:26,533 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:53:26,649 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 21:53:26,651 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [870592601] [2020-07-20 21:53:26,651 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:53:26,652 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-07-20 21:53:26,661 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1573734532] [2020-07-20 21:53:26,665 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 21:53:26,666 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:53:26,667 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 21:53:26,667 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-20 21:53:26,667 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 6 states. [2020-07-20 21:53:26,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:53:26,805 INFO L93 Difference]: Finished difference Result 39 states and 43 transitions. [2020-07-20 21:53:26,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 21:53:26,807 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-07-20 21:53:26,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:53:26,809 INFO L225 Difference]: With dead ends: 39 [2020-07-20 21:53:26,811 INFO L226 Difference]: Without dead ends: 27 [2020-07-20 21:53:26,814 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-20 21:53:26,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-07-20 21:53:26,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-07-20 21:53:26,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-20 21:53:26,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-07-20 21:53:26,841 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 20 [2020-07-20 21:53:26,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:53:26,842 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-07-20 21:53:26,842 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 21:53:26,843 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-07-20 21:53:26,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 21:53:26,846 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:53:26,847 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:53:27,062 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:53:27,064 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:53:27,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:53:27,065 INFO L82 PathProgramCache]: Analyzing trace with hash -1818492333, now seen corresponding path program 2 times [2020-07-20 21:53:27,065 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:53:27,066 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [141703946] [2020-07-20 21:53:27,066 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 21:53:28,348 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:53:28,349 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:53:28,356 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 21:53:28,359 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:53:28,434 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:53:28,435 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:53:28,573 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:53:28,575 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [141703946] [2020-07-20 21:53:28,575 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:53:28,576 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-20 21:53:28,576 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [875194758] [2020-07-20 21:53:28,577 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 21:53:28,578 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:53:28,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 21:53:28,580 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-07-20 21:53:28,581 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 12 states. [2020-07-20 21:53:28,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:53:28,753 INFO L93 Difference]: Finished difference Result 51 states and 58 transitions. [2020-07-20 21:53:28,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 21:53:28,754 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 26 [2020-07-20 21:53:28,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:53:28,758 INFO L225 Difference]: With dead ends: 51 [2020-07-20 21:53:28,761 INFO L226 Difference]: Without dead ends: 39 [2020-07-20 21:53:28,763 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-07-20 21:53:28,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-07-20 21:53:28,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-07-20 21:53:28,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-07-20 21:53:28,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-07-20 21:53:28,801 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 26 [2020-07-20 21:53:28,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:53:28,805 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-07-20 21:53:28,805 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 21:53:28,806 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-07-20 21:53:28,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-07-20 21:53:28,812 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:53:28,813 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:53:29,029 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:53:29,030 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:53:29,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:53:29,034 INFO L82 PathProgramCache]: Analyzing trace with hash 1671822879, now seen corresponding path program 3 times [2020-07-20 21:53:29,035 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:53:29,036 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1822922767] [2020-07-20 21:53:29,037 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