/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/locks/test_locks_8.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 17:12:28,171 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 17:12:28,174 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 17:12:28,197 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 17:12:28,197 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 17:12:28,201 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 17:12:28,203 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 17:12:28,210 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 17:12:28,213 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 17:12:28,214 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 17:12:28,220 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 17:12:28,221 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 17:12:28,222 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 17:12:28,223 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 17:12:28,228 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 17:12:28,229 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 17:12:28,229 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 17:12:28,230 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 17:12:28,234 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 17:12:28,236 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 17:12:28,243 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 17:12:28,248 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 17:12:28,250 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 17:12:28,253 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 17:12:28,259 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 17:12:28,278 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 17:12:28,279 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 17:12:28,281 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 17:12:28,283 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 17:12:28,305 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 17:12:28,305 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 17:12:28,307 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 17:12:28,308 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 17:12:28,308 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 17:12:28,308 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 17:12:28,309 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 17:12:28,309 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 17:12:28,309 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 17:12:28,309 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 17:12:28,309 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 17:12:28,310 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 17:12:28,310 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 17:12:28,310 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 17:12:28,310 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 17:12:28,311 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 17:12:28,311 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 17:12:28,311 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 17:12:28,311 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 17:12:28,312 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 17:12:28,312 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 17:12:28,312 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 17:12:28,312 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 17:12:28,312 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 17:12:28,313 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 17:12:28,313 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 17:12:28,313 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:28,313 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 17:12:28,314 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 17:12:28,314 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 17:12:28,679 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 17:12:28,697 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 17:12:28,702 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 17:12:28,705 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 17:12:28,705 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 17:12:28,706 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/locks/test_locks_8.c [2020-07-20 17:12:28,798 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2ac3b2fe7/266ef5ff95d34d21833dbf6dda711841/FLAGfb1a4c4c1 [2020-07-20 17:12:29,440 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 17:12:29,441 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/locks/test_locks_8.c [2020-07-20 17:12:29,452 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2ac3b2fe7/266ef5ff95d34d21833dbf6dda711841/FLAGfb1a4c4c1 [2020-07-20 17:12:29,737 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2ac3b2fe7/266ef5ff95d34d21833dbf6dda711841 [2020-07-20 17:12:29,747 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 17:12:29,751 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 17:12:29,753 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 17:12:29,753 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 17:12:29,766 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 17:12:29,768 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:12:29" (1/1) ... [2020-07-20 17:12:29,773 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@55fc409a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:29, skipping insertion in model container [2020-07-20 17:12:29,774 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:12:29" (1/1) ... [2020-07-20 17:12:29,786 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 17:12:29,815 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 17:12:30,079 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:12:30,086 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 17:12:30,112 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:12:30,129 INFO L208 MainTranslator]: Completed translation [2020-07-20 17:12:30,130 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:30 WrapperNode [2020-07-20 17:12:30,130 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 17:12:30,132 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 17:12:30,132 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 17:12:30,132 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 17:12:30,254 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:30" (1/1) ... [2020-07-20 17:12:30,255 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:30" (1/1) ... [2020-07-20 17:12:30,266 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:30" (1/1) ... [2020-07-20 17:12:30,266 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:30" (1/1) ... [2020-07-20 17:12:30,273 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:30" (1/1) ... [2020-07-20 17:12:30,283 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:30" (1/1) ... [2020-07-20 17:12:30,286 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:30" (1/1) ... [2020-07-20 17:12:30,289 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 17:12:30,290 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 17:12:30,290 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 17:12:30,290 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 17:12:30,292 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:30" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 17:12:30,371 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 17:12:30,372 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 17:12:30,372 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 17:12:30,372 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 17:12:30,372 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 17:12:30,372 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 17:12:30,372 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 17:12:30,373 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 17:12:30,727 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 17:12:30,729 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 17:12:30,738 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:12:30 BoogieIcfgContainer [2020-07-20 17:12:30,739 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 17:12:30,742 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 17:12:30,742 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 17:12:30,750 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 17:12:30,751 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 05:12:29" (1/3) ... [2020-07-20 17:12:30,753 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1dfd62af and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:12:30, skipping insertion in model container [2020-07-20 17:12:30,754 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:30" (2/3) ... [2020-07-20 17:12:30,754 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1dfd62af and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:12:30, skipping insertion in model container [2020-07-20 17:12:30,755 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:12:30" (3/3) ... [2020-07-20 17:12:30,757 INFO L109 eAbstractionObserver]: Analyzing ICFG test_locks_8.c [2020-07-20 17:12:30,779 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 17:12:30,789 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 17:12:30,815 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 17:12:30,851 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 17:12:30,852 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 17:12:30,852 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 17:12:30,852 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 17:12:30,852 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 17:12:30,852 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 17:12:30,853 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 17:12:30,853 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 17:12:30,885 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states. [2020-07-20 17:12:30,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-20 17:12:30,895 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:30,897 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 17:12:30,897 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:30,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:30,910 INFO L82 PathProgramCache]: Analyzing trace with hash 577441593, now seen corresponding path program 1 times [2020-07-20 17:12:30,920 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:30,920 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1713044318] [2020-07-20 17:12:30,921 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:31,034 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:31,035 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:31,039 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:31,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:31,095 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:31,096 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:31,097 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1713044318] [2020-07-20 17:12:31,098 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:31,099 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:31,101 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1295482565] [2020-07-20 17:12:31,110 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:31,110 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:31,130 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:31,131 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:31,134 INFO L87 Difference]: Start difference. First operand 38 states. Second operand 3 states. [2020-07-20 17:12:31,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:31,221 INFO L93 Difference]: Finished difference Result 75 states and 126 transitions. [2020-07-20 17:12:31,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:31,224 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-20 17:12:31,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:31,241 INFO L225 Difference]: With dead ends: 75 [2020-07-20 17:12:31,241 INFO L226 Difference]: Without dead ends: 60 [2020-07-20 17:12:31,245 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 17:12:31,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-20 17:12:31,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 42. [2020-07-20 17:12:31,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-07-20 17:12:31,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 73 transitions. [2020-07-20 17:12:31,315 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 73 transitions. Word has length 18 [2020-07-20 17:12:31,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:31,317 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 73 transitions. [2020-07-20 17:12:31,317 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:31,317 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 73 transitions. [2020-07-20 17:12:31,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-20 17:12:31,319 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:31,319 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 17:12:31,533 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:31,534 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:31,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:31,535 INFO L82 PathProgramCache]: Analyzing trace with hash 1278506171, now seen corresponding path program 1 times [2020-07-20 17:12:31,536 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:31,536 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [194037239] [2020-07-20 17:12:31,537 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:31,602 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:31,603 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:31,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:31,607 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:31,626 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:31,632 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:31,632 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [194037239] [2020-07-20 17:12:31,632 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:31,633 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:31,633 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1404057044] [2020-07-20 17:12:31,636 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:31,636 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:31,637 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:31,637 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:31,638 INFO L87 Difference]: Start difference. First operand 42 states and 73 transitions. Second operand 3 states. [2020-07-20 17:12:31,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:31,672 INFO L93 Difference]: Finished difference Result 97 states and 172 transitions. [2020-07-20 17:12:31,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:31,674 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-20 17:12:31,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:31,676 INFO L225 Difference]: With dead ends: 97 [2020-07-20 17:12:31,676 INFO L226 Difference]: Without dead ends: 60 [2020-07-20 17:12:31,678 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 17:12:31,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-20 17:12:31,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 58. [2020-07-20 17:12:31,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-07-20 17:12:31,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 101 transitions. [2020-07-20 17:12:31,691 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 101 transitions. Word has length 18 [2020-07-20 17:12:31,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:31,692 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 101 transitions. [2020-07-20 17:12:31,692 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:31,692 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 101 transitions. [2020-07-20 17:12:31,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 17:12:31,694 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:31,694 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:31,909 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:31,911 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:31,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:31,912 INFO L82 PathProgramCache]: Analyzing trace with hash 721034227, now seen corresponding path program 1 times [2020-07-20 17:12:31,913 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:31,913 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [646701512] [2020-07-20 17:12:31,914 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:31,975 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:31,976 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:31,977 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:31,979 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:32,006 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:32,007 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:32,007 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [646701512] [2020-07-20 17:12:32,008 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:32,008 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:32,008 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1830264060] [2020-07-20 17:12:32,012 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:32,012 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:32,013 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:32,013 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:32,013 INFO L87 Difference]: Start difference. First operand 58 states and 101 transitions. Second operand 3 states. [2020-07-20 17:12:32,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:32,054 INFO L93 Difference]: Finished difference Result 90 states and 153 transitions. [2020-07-20 17:12:32,055 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:32,055 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-20 17:12:32,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:32,057 INFO L225 Difference]: With dead ends: 90 [2020-07-20 17:12:32,058 INFO L226 Difference]: Without dead ends: 63 [2020-07-20 17:12:32,059 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 17 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 17:12:32,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-20 17:12:32,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 61. [2020-07-20 17:12:32,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 17:12:32,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 103 transitions. [2020-07-20 17:12:32,071 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 103 transitions. Word has length 19 [2020-07-20 17:12:32,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:32,072 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 103 transitions. [2020-07-20 17:12:32,072 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:32,072 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 103 transitions. [2020-07-20 17:12:32,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 17:12:32,073 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:32,073 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:32,289 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:32,290 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:32,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:32,291 INFO L82 PathProgramCache]: Analyzing trace with hash 979199665, now seen corresponding path program 1 times [2020-07-20 17:12:32,291 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:32,292 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [94470658] [2020-07-20 17:12:32,292 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:32,346 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:32,347 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:32,348 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:32,350 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:32,367 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:32,368 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:32,369 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [94470658] [2020-07-20 17:12:32,369 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:32,369 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:32,370 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [991187700] [2020-07-20 17:12:32,370 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:32,371 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:32,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:32,372 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:32,373 INFO L87 Difference]: Start difference. First operand 61 states and 103 transitions. Second operand 3 states. [2020-07-20 17:12:32,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:32,406 INFO L93 Difference]: Finished difference Result 112 states and 192 transitions. [2020-07-20 17:12:32,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:32,407 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-20 17:12:32,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:32,409 INFO L225 Difference]: With dead ends: 112 [2020-07-20 17:12:32,410 INFO L226 Difference]: Without dead ends: 110 [2020-07-20 17:12:32,411 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 17 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 17:12:32,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-07-20 17:12:32,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 80. [2020-07-20 17:12:32,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-07-20 17:12:32,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 136 transitions. [2020-07-20 17:12:32,426 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 136 transitions. Word has length 19 [2020-07-20 17:12:32,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:32,426 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 136 transitions. [2020-07-20 17:12:32,426 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:32,427 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 136 transitions. [2020-07-20 17:12:32,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 17:12:32,428 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:32,428 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:32,641 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:32,642 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:32,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:32,643 INFO L82 PathProgramCache]: Analyzing trace with hash 1680264243, now seen corresponding path program 1 times [2020-07-20 17:12:32,644 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:32,644 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1931018902] [2020-07-20 17:12:32,644 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:32,696 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:32,696 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:32,698 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:32,700 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:32,718 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:32,719 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:32,719 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1931018902] [2020-07-20 17:12:32,720 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:32,720 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:32,720 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1327833866] [2020-07-20 17:12:32,721 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:32,722 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:32,722 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:32,723 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:32,723 INFO L87 Difference]: Start difference. First operand 80 states and 136 transitions. Second operand 3 states. [2020-07-20 17:12:32,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:32,757 INFO L93 Difference]: Finished difference Result 184 states and 318 transitions. [2020-07-20 17:12:32,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:32,777 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-20 17:12:32,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:32,781 INFO L225 Difference]: With dead ends: 184 [2020-07-20 17:12:32,781 INFO L226 Difference]: Without dead ends: 112 [2020-07-20 17:12:32,783 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 17 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 17:12:32,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-07-20 17:12:32,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 110. [2020-07-20 17:12:32,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2020-07-20 17:12:32,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 186 transitions. [2020-07-20 17:12:32,799 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 186 transitions. Word has length 19 [2020-07-20 17:12:32,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:32,800 INFO L479 AbstractCegarLoop]: Abstraction has 110 states and 186 transitions. [2020-07-20 17:12:32,800 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:32,800 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 186 transitions. [2020-07-20 17:12:32,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 17:12:32,802 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:32,802 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 17:12:33,018 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:33,019 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:33,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:33,020 INFO L82 PathProgramCache]: Analyzing trace with hash 290632912, now seen corresponding path program 1 times [2020-07-20 17:12:33,020 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:33,020 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [453637881] [2020-07-20 17:12:33,021 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:33,065 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:33,066 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:33,067 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:33,068 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:33,082 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:33,082 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:33,083 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [453637881] [2020-07-20 17:12:33,083 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:33,085 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:33,086 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [408438602] [2020-07-20 17:12:33,086 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:33,087 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:33,088 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:33,088 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:33,089 INFO L87 Difference]: Start difference. First operand 110 states and 186 transitions. Second operand 3 states. [2020-07-20 17:12:33,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:33,117 INFO L93 Difference]: Finished difference Result 165 states and 277 transitions. [2020-07-20 17:12:33,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:33,117 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-20 17:12:33,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:33,120 INFO L225 Difference]: With dead ends: 165 [2020-07-20 17:12:33,121 INFO L226 Difference]: Without dead ends: 114 [2020-07-20 17:12:33,122 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 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 17:12:33,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2020-07-20 17:12:33,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 112. [2020-07-20 17:12:33,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2020-07-20 17:12:33,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 186 transitions. [2020-07-20 17:12:33,144 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 186 transitions. Word has length 20 [2020-07-20 17:12:33,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:33,144 INFO L479 AbstractCegarLoop]: Abstraction has 112 states and 186 transitions. [2020-07-20 17:12:33,144 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:33,144 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 186 transitions. [2020-07-20 17:12:33,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 17:12:33,146 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:33,146 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 17:12:33,350 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:33,350 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:33,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:33,351 INFO L82 PathProgramCache]: Analyzing trace with hash 548798350, now seen corresponding path program 1 times [2020-07-20 17:12:33,352 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:33,352 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1308727597] [2020-07-20 17:12:33,353 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:33,396 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:33,396 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:33,397 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:33,399 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:33,409 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:33,410 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:33,414 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1308727597] [2020-07-20 17:12:33,415 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:33,415 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:33,416 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [560330622] [2020-07-20 17:12:33,416 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:33,417 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:33,417 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:33,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:33,417 INFO L87 Difference]: Start difference. First operand 112 states and 186 transitions. Second operand 3 states. [2020-07-20 17:12:33,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:33,440 INFO L93 Difference]: Finished difference Result 204 states and 344 transitions. [2020-07-20 17:12:33,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:33,441 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-20 17:12:33,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:33,443 INFO L225 Difference]: With dead ends: 204 [2020-07-20 17:12:33,444 INFO L226 Difference]: Without dead ends: 202 [2020-07-20 17:12:33,445 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 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 17:12:33,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2020-07-20 17:12:33,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 152. [2020-07-20 17:12:33,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 152 states. [2020-07-20 17:12:33,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 250 transitions. [2020-07-20 17:12:33,462 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 250 transitions. Word has length 20 [2020-07-20 17:12:33,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:33,462 INFO L479 AbstractCegarLoop]: Abstraction has 152 states and 250 transitions. [2020-07-20 17:12:33,462 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:33,463 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 250 transitions. [2020-07-20 17:12:33,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 17:12:33,464 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:33,465 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 17:12:33,678 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:33,680 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:33,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:33,680 INFO L82 PathProgramCache]: Analyzing trace with hash 1249862928, now seen corresponding path program 1 times [2020-07-20 17:12:33,681 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:33,681 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [165781786] [2020-07-20 17:12:33,682 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:33,728 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:33,729 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:33,730 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:33,735 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:33,747 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:33,747 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:33,748 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [165781786] [2020-07-20 17:12:33,749 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:33,749 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:33,749 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [859881689] [2020-07-20 17:12:33,750 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:33,750 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:33,750 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:33,751 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:33,751 INFO L87 Difference]: Start difference. First operand 152 states and 250 transitions. Second operand 3 states. [2020-07-20 17:12:33,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:33,781 INFO L93 Difference]: Finished difference Result 352 states and 584 transitions. [2020-07-20 17:12:33,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:33,782 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-20 17:12:33,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:33,785 INFO L225 Difference]: With dead ends: 352 [2020-07-20 17:12:33,785 INFO L226 Difference]: Without dead ends: 210 [2020-07-20 17:12:33,787 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 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 17:12:33,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2020-07-20 17:12:33,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 208. [2020-07-20 17:12:33,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 208 states. [2020-07-20 17:12:33,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 338 transitions. [2020-07-20 17:12:33,805 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 338 transitions. Word has length 20 [2020-07-20 17:12:33,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:33,806 INFO L479 AbstractCegarLoop]: Abstraction has 208 states and 338 transitions. [2020-07-20 17:12:33,806 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:33,806 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 338 transitions. [2020-07-20 17:12:33,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 17:12:33,809 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:33,809 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, 1] [2020-07-20 17:12:34,023 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:34,024 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:34,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:34,025 INFO L82 PathProgramCache]: Analyzing trace with hash -166905624, now seen corresponding path program 1 times [2020-07-20 17:12:34,026 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:34,026 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [529814334] [2020-07-20 17:12:34,027 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 [2020-07-20 17:12:34,068 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:12:34,068 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:34,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:34,071 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:34,088 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:34,089 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:34,089 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [529814334] [2020-07-20 17:12:34,089 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:34,090 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:34,090 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [948296208] [2020-07-20 17:12:34,090 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:34,090 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:34,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:34,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:34,091 INFO L87 Difference]: Start difference. First operand 208 states and 338 transitions. Second operand 3 states. [2020-07-20 17:12:34,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:34,111 INFO L93 Difference]: Finished difference Result 312 states and 504 transitions. [2020-07-20 17:12:34,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:34,112 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-20 17:12:34,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:34,114 INFO L225 Difference]: With dead ends: 312 [2020-07-20 17:12:34,115 INFO L226 Difference]: Without dead ends: 214 [2020-07-20 17:12:34,116 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 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 17:12:34,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2020-07-20 17:12:34,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 212. [2020-07-20 17:12:34,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 212 states. [2020-07-20 17:12:34,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 338 transitions. [2020-07-20 17:12:34,133 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 338 transitions. Word has length 21 [2020-07-20 17:12:34,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:34,134 INFO L479 AbstractCegarLoop]: Abstraction has 212 states and 338 transitions. [2020-07-20 17:12:34,134 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:34,134 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 338 transitions. [2020-07-20 17:12:34,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 17:12:34,136 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:34,136 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, 1] [2020-07-20 17:12:34,347 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:34,348 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:34,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:34,349 INFO L82 PathProgramCache]: Analyzing trace with hash 91259814, now seen corresponding path program 1 times [2020-07-20 17:12:34,349 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:34,350 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1006517993] [2020-07-20 17:12:34,351 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 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:34,394 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:34,395 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:34,395 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:34,397 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:34,415 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:34,417 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:34,417 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1006517993] [2020-07-20 17:12:34,418 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:34,418 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:34,418 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [747586293] [2020-07-20 17:12:34,419 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:34,419 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:34,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:34,421 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:34,422 INFO L87 Difference]: Start difference. First operand 212 states and 338 transitions. Second operand 3 states. [2020-07-20 17:12:34,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:34,482 INFO L93 Difference]: Finished difference Result 380 states and 616 transitions. [2020-07-20 17:12:34,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:34,485 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-20 17:12:34,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:34,489 INFO L225 Difference]: With dead ends: 380 [2020-07-20 17:12:34,490 INFO L226 Difference]: Without dead ends: 378 [2020-07-20 17:12:34,491 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 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 17:12:34,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 378 states. [2020-07-20 17:12:34,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 378 to 296. [2020-07-20 17:12:34,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 296 states. [2020-07-20 17:12:34,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 296 states to 296 states and 462 transitions. [2020-07-20 17:12:34,521 INFO L78 Accepts]: Start accepts. Automaton has 296 states and 462 transitions. Word has length 21 [2020-07-20 17:12:34,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:34,522 INFO L479 AbstractCegarLoop]: Abstraction has 296 states and 462 transitions. [2020-07-20 17:12:34,522 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:34,522 INFO L276 IsEmpty]: Start isEmpty. Operand 296 states and 462 transitions. [2020-07-20 17:12:34,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 17:12:34,541 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:34,541 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, 1] [2020-07-20 17:12:34,755 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:34,755 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:34,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:34,755 INFO L82 PathProgramCache]: Analyzing trace with hash 792324392, now seen corresponding path program 1 times [2020-07-20 17:12:34,756 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:34,756 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [474189960] [2020-07-20 17:12:34,756 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 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:34,829 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:34,829 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:34,831 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:34,839 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:34,867 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:34,868 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:34,869 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [474189960] [2020-07-20 17:12:34,869 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:34,869 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:34,870 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [565227940] [2020-07-20 17:12:34,871 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:34,871 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:34,872 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:34,872 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:34,872 INFO L87 Difference]: Start difference. First operand 296 states and 462 transitions. Second operand 3 states. [2020-07-20 17:12:34,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:34,906 INFO L93 Difference]: Finished difference Result 684 states and 1072 transitions. [2020-07-20 17:12:34,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:34,908 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-20 17:12:34,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:34,911 INFO L225 Difference]: With dead ends: 684 [2020-07-20 17:12:34,911 INFO L226 Difference]: Without dead ends: 402 [2020-07-20 17:12:34,913 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 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 17:12:34,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 402 states. [2020-07-20 17:12:34,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 402 to 400. [2020-07-20 17:12:34,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 400 states. [2020-07-20 17:12:34,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 400 states to 400 states and 614 transitions. [2020-07-20 17:12:34,934 INFO L78 Accepts]: Start accepts. Automaton has 400 states and 614 transitions. Word has length 21 [2020-07-20 17:12:34,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:34,934 INFO L479 AbstractCegarLoop]: Abstraction has 400 states and 614 transitions. [2020-07-20 17:12:34,934 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:34,934 INFO L276 IsEmpty]: Start isEmpty. Operand 400 states and 614 transitions. [2020-07-20 17:12:34,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 17:12:34,937 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:34,937 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, 1, 1] [2020-07-20 17:12:35,150 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:35,151 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:35,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:35,152 INFO L82 PathProgramCache]: Analyzing trace with hash -1465698011, now seen corresponding path program 1 times [2020-07-20 17:12:35,152 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:35,152 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1340772065] [2020-07-20 17:12:35,153 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 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:35,193 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:35,194 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:35,196 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:35,199 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:35,212 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:35,213 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:35,213 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1340772065] [2020-07-20 17:12:35,213 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:35,214 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:35,214 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [154918926] [2020-07-20 17:12:35,215 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:35,215 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:35,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:35,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:35,217 INFO L87 Difference]: Start difference. First operand 400 states and 614 transitions. Second operand 3 states. [2020-07-20 17:12:35,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:35,244 INFO L93 Difference]: Finished difference Result 600 states and 916 transitions. [2020-07-20 17:12:35,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:35,245 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-20 17:12:35,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:35,249 INFO L225 Difference]: With dead ends: 600 [2020-07-20 17:12:35,249 INFO L226 Difference]: Without dead ends: 410 [2020-07-20 17:12:35,251 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 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 17:12:35,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 410 states. [2020-07-20 17:12:35,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 410 to 408. [2020-07-20 17:12:35,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 408 states. [2020-07-20 17:12:35,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 408 states to 408 states and 614 transitions. [2020-07-20 17:12:35,274 INFO L78 Accepts]: Start accepts. Automaton has 408 states and 614 transitions. Word has length 22 [2020-07-20 17:12:35,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:35,275 INFO L479 AbstractCegarLoop]: Abstraction has 408 states and 614 transitions. [2020-07-20 17:12:35,275 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:35,275 INFO L276 IsEmpty]: Start isEmpty. Operand 408 states and 614 transitions. [2020-07-20 17:12:35,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 17:12:35,278 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:35,278 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, 1, 1] [2020-07-20 17:12:35,494 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:35,494 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:35,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:35,495 INFO L82 PathProgramCache]: Analyzing trace with hash -1207532573, now seen corresponding path program 1 times [2020-07-20 17:12:35,496 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:35,497 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [828668861] [2020-07-20 17:12:35,497 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 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:35,538 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:35,539 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:35,540 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:35,541 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:35,552 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:35,553 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:35,553 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [828668861] [2020-07-20 17:12:35,554 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:35,554 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:35,555 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1306052701] [2020-07-20 17:12:35,557 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:35,558 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:35,559 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:35,559 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:35,559 INFO L87 Difference]: Start difference. First operand 408 states and 614 transitions. Second operand 3 states. [2020-07-20 17:12:35,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:35,593 INFO L93 Difference]: Finished difference Result 716 states and 1096 transitions. [2020-07-20 17:12:35,596 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:35,597 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-20 17:12:35,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:35,613 INFO L225 Difference]: With dead ends: 716 [2020-07-20 17:12:35,613 INFO L226 Difference]: Without dead ends: 714 [2020-07-20 17:12:35,614 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 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 17:12:35,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 714 states. [2020-07-20 17:12:35,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 714 to 584. [2020-07-20 17:12:35,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 584 states. [2020-07-20 17:12:35,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 584 states to 584 states and 854 transitions. [2020-07-20 17:12:35,639 INFO L78 Accepts]: Start accepts. Automaton has 584 states and 854 transitions. Word has length 22 [2020-07-20 17:12:35,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:35,639 INFO L479 AbstractCegarLoop]: Abstraction has 584 states and 854 transitions. [2020-07-20 17:12:35,639 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:35,639 INFO L276 IsEmpty]: Start isEmpty. Operand 584 states and 854 transitions. [2020-07-20 17:12:35,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 17:12:35,642 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:35,642 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, 1, 1] [2020-07-20 17:12:35,855 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:35,856 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:35,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:35,857 INFO L82 PathProgramCache]: Analyzing trace with hash -506467995, now seen corresponding path program 1 times [2020-07-20 17:12:35,857 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:35,858 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1223283336] [2020-07-20 17:12:35,858 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 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:35,892 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:35,893 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:35,894 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:35,896 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:35,911 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:35,911 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:35,911 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1223283336] [2020-07-20 17:12:35,912 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:35,912 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:35,912 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1084815572] [2020-07-20 17:12:35,919 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:35,920 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:35,920 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:35,920 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:35,920 INFO L87 Difference]: Start difference. First operand 584 states and 854 transitions. Second operand 3 states. [2020-07-20 17:12:35,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:35,959 INFO L93 Difference]: Finished difference Result 1340 states and 1960 transitions. [2020-07-20 17:12:35,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:35,960 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-20 17:12:35,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:35,969 INFO L225 Difference]: With dead ends: 1340 [2020-07-20 17:12:35,969 INFO L226 Difference]: Without dead ends: 778 [2020-07-20 17:12:35,973 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 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 17:12:35,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 778 states. [2020-07-20 17:12:35,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 778 to 776. [2020-07-20 17:12:36,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 776 states. [2020-07-20 17:12:36,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 776 states to 776 states and 1110 transitions. [2020-07-20 17:12:36,005 INFO L78 Accepts]: Start accepts. Automaton has 776 states and 1110 transitions. Word has length 22 [2020-07-20 17:12:36,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:36,006 INFO L479 AbstractCegarLoop]: Abstraction has 776 states and 1110 transitions. [2020-07-20 17:12:36,006 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:36,006 INFO L276 IsEmpty]: Start isEmpty. Operand 776 states and 1110 transitions. [2020-07-20 17:12:36,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-20 17:12:36,008 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:36,009 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, 1, 1, 1] [2020-07-20 17:12:36,222 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:36,223 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:36,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:36,224 INFO L82 PathProgramCache]: Analyzing trace with hash 1221411293, now seen corresponding path program 1 times [2020-07-20 17:12:36,224 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:36,225 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1772720137] [2020-07-20 17:12:36,225 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 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:36,263 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:36,263 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:36,264 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:36,266 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:36,277 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:36,278 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:36,278 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1772720137] [2020-07-20 17:12:36,279 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:36,279 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:36,279 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1672097841] [2020-07-20 17:12:36,280 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:36,280 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:36,281 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:36,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:36,281 INFO L87 Difference]: Start difference. First operand 776 states and 1110 transitions. Second operand 3 states. [2020-07-20 17:12:36,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:36,315 INFO L93 Difference]: Finished difference Result 1164 states and 1656 transitions. [2020-07-20 17:12:36,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:36,316 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-20 17:12:36,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:36,321 INFO L225 Difference]: With dead ends: 1164 [2020-07-20 17:12:36,322 INFO L226 Difference]: Without dead ends: 794 [2020-07-20 17:12:36,324 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 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 17:12:36,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 794 states. [2020-07-20 17:12:36,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 794 to 792. [2020-07-20 17:12:36,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 792 states. [2020-07-20 17:12:36,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 792 states to 792 states and 1110 transitions. [2020-07-20 17:12:36,357 INFO L78 Accepts]: Start accepts. Automaton has 792 states and 1110 transitions. Word has length 23 [2020-07-20 17:12:36,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:36,357 INFO L479 AbstractCegarLoop]: Abstraction has 792 states and 1110 transitions. [2020-07-20 17:12:36,358 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:36,358 INFO L276 IsEmpty]: Start isEmpty. Operand 792 states and 1110 transitions. [2020-07-20 17:12:36,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-20 17:12:36,360 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:36,360 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, 1, 1, 1] [2020-07-20 17:12:36,574 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:36,576 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:36,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:36,577 INFO L82 PathProgramCache]: Analyzing trace with hash 1479576731, now seen corresponding path program 1 times [2020-07-20 17:12:36,577 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:36,577 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1094389689] [2020-07-20 17:12:36,578 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 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:36,614 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:36,614 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:36,616 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:36,617 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:36,634 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:36,635 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:36,635 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1094389689] [2020-07-20 17:12:36,636 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:36,636 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:36,636 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1010982313] [2020-07-20 17:12:36,637 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:36,639 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:36,640 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:36,640 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:36,640 INFO L87 Difference]: Start difference. First operand 792 states and 1110 transitions. Second operand 3 states. [2020-07-20 17:12:36,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:36,696 INFO L93 Difference]: Finished difference Result 1356 states and 1928 transitions. [2020-07-20 17:12:36,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:36,696 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-20 17:12:36,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:36,706 INFO L225 Difference]: With dead ends: 1356 [2020-07-20 17:12:36,707 INFO L226 Difference]: Without dead ends: 1354 [2020-07-20 17:12:36,708 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 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 17:12:36,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1354 states. [2020-07-20 17:12:36,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1354 to 1160. [2020-07-20 17:12:36,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1160 states. [2020-07-20 17:12:36,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1160 states to 1160 states and 1574 transitions. [2020-07-20 17:12:36,763 INFO L78 Accepts]: Start accepts. Automaton has 1160 states and 1574 transitions. Word has length 23 [2020-07-20 17:12:36,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:36,764 INFO L479 AbstractCegarLoop]: Abstraction has 1160 states and 1574 transitions. [2020-07-20 17:12:36,764 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:36,764 INFO L276 IsEmpty]: Start isEmpty. Operand 1160 states and 1574 transitions. [2020-07-20 17:12:36,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-20 17:12:36,767 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:36,767 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, 1, 1, 1] [2020-07-20 17:12:36,984 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:36,985 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:36,986 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:36,986 INFO L82 PathProgramCache]: Analyzing trace with hash -2114325987, now seen corresponding path program 1 times [2020-07-20 17:12:36,987 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:36,987 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1773602738] [2020-07-20 17:12:36,987 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 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:37,048 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:37,049 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:37,050 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:37,052 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:37,069 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:37,070 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:37,070 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1773602738] [2020-07-20 17:12:37,071 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:37,075 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:37,076 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1718314687] [2020-07-20 17:12:37,077 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:37,077 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:37,078 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:37,078 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:37,078 INFO L87 Difference]: Start difference. First operand 1160 states and 1574 transitions. Second operand 3 states. [2020-07-20 17:12:37,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:37,155 INFO L93 Difference]: Finished difference Result 2636 states and 3560 transitions. [2020-07-20 17:12:37,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:37,156 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-20 17:12:37,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:37,166 INFO L225 Difference]: With dead ends: 2636 [2020-07-20 17:12:37,167 INFO L226 Difference]: Without dead ends: 1514 [2020-07-20 17:12:37,172 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 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 17:12:37,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1514 states. [2020-07-20 17:12:37,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1514 to 1512. [2020-07-20 17:12:37,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1512 states. [2020-07-20 17:12:37,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1512 states to 1512 states and 1990 transitions. [2020-07-20 17:12:37,262 INFO L78 Accepts]: Start accepts. Automaton has 1512 states and 1990 transitions. Word has length 23 [2020-07-20 17:12:37,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:37,264 INFO L479 AbstractCegarLoop]: Abstraction has 1512 states and 1990 transitions. [2020-07-20 17:12:37,264 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:37,264 INFO L276 IsEmpty]: Start isEmpty. Operand 1512 states and 1990 transitions. [2020-07-20 17:12:37,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-20 17:12:37,269 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:37,270 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, 1, 1, 1, 1] [2020-07-20 17:12:37,484 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:37,485 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:37,486 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:37,486 INFO L82 PathProgramCache]: Analyzing trace with hash -1377545862, now seen corresponding path program 1 times [2020-07-20 17:12:37,487 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:37,487 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [816239835] [2020-07-20 17:12:37,488 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 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:37,532 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:37,532 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:37,534 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:37,535 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:37,542 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:37,543 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:37,543 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [816239835] [2020-07-20 17:12:37,544 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:37,544 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:37,544 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [432632116] [2020-07-20 17:12:37,545 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:37,545 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:37,546 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:37,546 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:37,546 INFO L87 Difference]: Start difference. First operand 1512 states and 1990 transitions. Second operand 3 states. [2020-07-20 17:12:37,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:37,606 INFO L93 Difference]: Finished difference Result 2268 states and 2968 transitions. [2020-07-20 17:12:37,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:37,608 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-20 17:12:37,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:37,618 INFO L225 Difference]: With dead ends: 2268 [2020-07-20 17:12:37,618 INFO L226 Difference]: Without dead ends: 1546 [2020-07-20 17:12:37,621 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 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 17:12:37,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1546 states. [2020-07-20 17:12:37,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1546 to 1544. [2020-07-20 17:12:37,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1544 states. [2020-07-20 17:12:37,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1544 states to 1544 states and 1990 transitions. [2020-07-20 17:12:37,690 INFO L78 Accepts]: Start accepts. Automaton has 1544 states and 1990 transitions. Word has length 24 [2020-07-20 17:12:37,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:37,691 INFO L479 AbstractCegarLoop]: Abstraction has 1544 states and 1990 transitions. [2020-07-20 17:12:37,691 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:37,691 INFO L276 IsEmpty]: Start isEmpty. Operand 1544 states and 1990 transitions. [2020-07-20 17:12:37,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-20 17:12:37,696 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:37,697 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, 1, 1, 1, 1] [2020-07-20 17:12:37,910 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:37,911 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:37,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:37,912 INFO L82 PathProgramCache]: Analyzing trace with hash -1119380424, now seen corresponding path program 1 times [2020-07-20 17:12:37,912 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:37,913 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [437669817] [2020-07-20 17:12:37,913 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 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:37,987 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:37,987 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:37,989 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:37,991 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:37,998 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:37,999 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:37,999 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [437669817] [2020-07-20 17:12:38,000 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:38,000 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:38,000 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1205805184] [2020-07-20 17:12:38,000 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:38,001 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:38,001 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:38,001 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:38,001 INFO L87 Difference]: Start difference. First operand 1544 states and 1990 transitions. Second operand 3 states. [2020-07-20 17:12:38,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:38,066 INFO L93 Difference]: Finished difference Result 2572 states and 3336 transitions. [2020-07-20 17:12:38,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:38,067 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-20 17:12:38,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:38,083 INFO L225 Difference]: With dead ends: 2572 [2020-07-20 17:12:38,083 INFO L226 Difference]: Without dead ends: 2570 [2020-07-20 17:12:38,086 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 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 17:12:38,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2570 states. [2020-07-20 17:12:38,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2570 to 2312. [2020-07-20 17:12:38,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2312 states. [2020-07-20 17:12:38,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2312 states to 2312 states and 2886 transitions. [2020-07-20 17:12:38,168 INFO L78 Accepts]: Start accepts. Automaton has 2312 states and 2886 transitions. Word has length 24 [2020-07-20 17:12:38,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:38,168 INFO L479 AbstractCegarLoop]: Abstraction has 2312 states and 2886 transitions. [2020-07-20 17:12:38,168 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:38,169 INFO L276 IsEmpty]: Start isEmpty. Operand 2312 states and 2886 transitions. [2020-07-20 17:12:38,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-20 17:12:38,174 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:38,174 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, 1, 1, 1, 1] [2020-07-20 17:12:38,387 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:38,388 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:38,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:38,389 INFO L82 PathProgramCache]: Analyzing trace with hash -418315846, now seen corresponding path program 1 times [2020-07-20 17:12:38,389 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:38,390 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [997345371] [2020-07-20 17:12:38,390 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 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:38,427 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:38,428 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:38,429 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:38,431 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:38,447 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:38,448 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:38,448 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [997345371] [2020-07-20 17:12:38,448 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:38,449 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:38,449 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1782253520] [2020-07-20 17:12:38,449 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:38,450 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:38,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:38,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:38,451 INFO L87 Difference]: Start difference. First operand 2312 states and 2886 transitions. Second operand 3 states. [2020-07-20 17:12:38,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:38,532 INFO L93 Difference]: Finished difference Result 5196 states and 6408 transitions. [2020-07-20 17:12:38,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:38,533 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-20 17:12:38,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:38,550 INFO L225 Difference]: With dead ends: 5196 [2020-07-20 17:12:38,550 INFO L226 Difference]: Without dead ends: 2954 [2020-07-20 17:12:38,557 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 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 17:12:38,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2954 states. [2020-07-20 17:12:38,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2954 to 2952. [2020-07-20 17:12:38,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2952 states. [2020-07-20 17:12:38,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2952 states to 2952 states and 3526 transitions. [2020-07-20 17:12:38,686 INFO L78 Accepts]: Start accepts. Automaton has 2952 states and 3526 transitions. Word has length 24 [2020-07-20 17:12:38,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:38,686 INFO L479 AbstractCegarLoop]: Abstraction has 2952 states and 3526 transitions. [2020-07-20 17:12:38,686 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:38,687 INFO L276 IsEmpty]: Start isEmpty. Operand 2952 states and 3526 transitions. [2020-07-20 17:12:38,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 17:12:38,692 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:38,693 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, 1, 1, 1, 1, 1] [2020-07-20 17:12:38,905 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:38,906 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:38,906 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:38,906 INFO L82 PathProgramCache]: Analyzing trace with hash -340838702, now seen corresponding path program 1 times [2020-07-20 17:12:38,907 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:38,907 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [812501272] [2020-07-20 17:12:38,907 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 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:38,947 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:38,947 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:38,949 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:38,950 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:38,964 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:38,965 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:38,965 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [812501272] [2020-07-20 17:12:38,966 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:38,966 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:38,966 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1276264593] [2020-07-20 17:12:38,967 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:38,967 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:38,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:38,968 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:38,968 INFO L87 Difference]: Start difference. First operand 2952 states and 3526 transitions. Second operand 3 states. [2020-07-20 17:12:39,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:39,044 INFO L93 Difference]: Finished difference Result 4428 states and 5256 transitions. [2020-07-20 17:12:39,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:39,045 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-20 17:12:39,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:39,062 INFO L225 Difference]: With dead ends: 4428 [2020-07-20 17:12:39,063 INFO L226 Difference]: Without dead ends: 3018 [2020-07-20 17:12:39,068 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 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 17:12:39,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3018 states. [2020-07-20 17:12:39,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3018 to 3016. [2020-07-20 17:12:39,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3016 states. [2020-07-20 17:12:39,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3016 states to 3016 states and 3526 transitions. [2020-07-20 17:12:39,179 INFO L78 Accepts]: Start accepts. Automaton has 3016 states and 3526 transitions. Word has length 25 [2020-07-20 17:12:39,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:39,179 INFO L479 AbstractCegarLoop]: Abstraction has 3016 states and 3526 transitions. [2020-07-20 17:12:39,179 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:39,180 INFO L276 IsEmpty]: Start isEmpty. Operand 3016 states and 3526 transitions. [2020-07-20 17:12:39,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 17:12:39,185 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:39,185 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, 1, 1, 1, 1, 1] [2020-07-20 17:12:39,398 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:39,399 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:39,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:39,399 INFO L82 PathProgramCache]: Analyzing trace with hash -82673264, now seen corresponding path program 1 times [2020-07-20 17:12:39,400 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:39,400 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [92302615] [2020-07-20 17:12:39,400 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 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:39,440 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:39,441 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:39,442 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:39,444 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:39,456 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:39,457 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:39,457 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [92302615] [2020-07-20 17:12:39,457 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:39,457 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:39,458 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1226220606] [2020-07-20 17:12:39,458 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:39,458 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:39,459 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:39,459 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:39,459 INFO L87 Difference]: Start difference. First operand 3016 states and 3526 transitions. Second operand 3 states. [2020-07-20 17:12:39,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:39,574 INFO L93 Difference]: Finished difference Result 8650 states and 9799 transitions. [2020-07-20 17:12:39,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:39,575 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-20 17:12:39,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:39,590 INFO L225 Difference]: With dead ends: 8650 [2020-07-20 17:12:39,591 INFO L226 Difference]: Without dead ends: 3016 [2020-07-20 17:12:39,605 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 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 17:12:39,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3016 states. [2020-07-20 17:12:39,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3016 to 3016. [2020-07-20 17:12:39,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3016 states. [2020-07-20 17:12:39,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3016 states to 3016 states and 3270 transitions. [2020-07-20 17:12:39,712 INFO L78 Accepts]: Start accepts. Automaton has 3016 states and 3270 transitions. Word has length 25 [2020-07-20 17:12:39,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:39,712 INFO L479 AbstractCegarLoop]: Abstraction has 3016 states and 3270 transitions. [2020-07-20 17:12:39,712 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:39,712 INFO L276 IsEmpty]: Start isEmpty. Operand 3016 states and 3270 transitions. [2020-07-20 17:12:39,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 17:12:39,718 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:39,718 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, 1, 1, 1, 1, 1] [2020-07-20 17:12:39,933 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:39,934 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:39,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:39,935 INFO L82 PathProgramCache]: Analyzing trace with hash -783737842, now seen corresponding path program 1 times [2020-07-20 17:12:39,935 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:39,936 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1250050717] [2020-07-20 17:12:39,936 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 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:39,972 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:39,973 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:39,973 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:39,974 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:39,980 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:39,981 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:39,981 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1250050717] [2020-07-20 17:12:39,981 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:39,981 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:39,982 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1679142048] [2020-07-20 17:12:39,982 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:39,982 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:39,982 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:39,982 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:39,983 INFO L87 Difference]: Start difference. First operand 3016 states and 3270 transitions. Second operand 3 states. [2020-07-20 17:12:40,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:40,049 INFO L93 Difference]: Finished difference Result 3016 states and 3270 transitions. [2020-07-20 17:12:40,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:40,050 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-20 17:12:40,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:40,051 INFO L225 Difference]: With dead ends: 3016 [2020-07-20 17:12:40,051 INFO L226 Difference]: Without dead ends: 0 [2020-07-20 17:12:40,059 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 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 17:12:40,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-20 17:12:40,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-20 17:12:40,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-20 17:12:40,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-20 17:12:40,061 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 25 [2020-07-20 17:12:40,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:40,061 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-20 17:12:40,061 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:40,062 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-20 17:12:40,062 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-20 17:12:40,276 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:40,281 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-20 17:12:40,395 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-20 17:12:40,396 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-20 17:12:40,396 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-20 17:12:40,396 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-20 17:12:40,397 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-20 17:12:40,397 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-20 17:12:40,397 INFO L268 CegarLoopResult]: For program point L126(line 126) no Hoare annotation was computed. [2020-07-20 17:12:40,397 INFO L264 CegarLoopResult]: At program point L126-1(lines 5 135) the Hoare annotation is: false [2020-07-20 17:12:40,398 INFO L268 CegarLoopResult]: For program point L60-1(lines 33 130) no Hoare annotation was computed. [2020-07-20 17:12:40,398 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 4 135) no Hoare annotation was computed. [2020-07-20 17:12:40,398 INFO L268 CegarLoopResult]: For program point L110-1(lines 33 130) no Hoare annotation was computed. [2020-07-20 17:12:40,400 INFO L268 CegarLoopResult]: For program point L111(line 111) no Hoare annotation was computed. [2020-07-20 17:12:40,401 INFO L268 CegarLoopResult]: For program point L95-1(lines 33 130) no Hoare annotation was computed. [2020-07-20 17:12:40,402 INFO L268 CegarLoopResult]: For program point L120-1(lines 33 130) no Hoare annotation was computed. [2020-07-20 17:12:40,403 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 4 135) no Hoare annotation was computed. [2020-07-20 17:12:40,403 INFO L268 CegarLoopResult]: For program point L96(line 96) no Hoare annotation was computed. [2020-07-20 17:12:40,404 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 133) no Hoare annotation was computed. [2020-07-20 17:12:40,404 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 4 135) the Hoare annotation is: true [2020-07-20 17:12:40,404 INFO L268 CegarLoopResult]: For program point L121(line 121) no Hoare annotation was computed. [2020-07-20 17:12:40,406 INFO L268 CegarLoopResult]: For program point L80-1(lines 33 130) no Hoare annotation was computed. [2020-07-20 17:12:40,406 INFO L268 CegarLoopResult]: For program point L105-1(lines 33 130) no Hoare annotation was computed. [2020-07-20 17:12:40,407 INFO L268 CegarLoopResult]: For program point L72-1(lines 33 130) no Hoare annotation was computed. [2020-07-20 17:12:40,407 INFO L268 CegarLoopResult]: For program point L64-1(lines 33 130) no Hoare annotation was computed. [2020-07-20 17:12:40,407 INFO L268 CegarLoopResult]: For program point L56(lines 56 58) no Hoare annotation was computed. [2020-07-20 17:12:40,407 INFO L268 CegarLoopResult]: For program point L56-2(lines 33 130) no Hoare annotation was computed. [2020-07-20 17:12:40,408 INFO L268 CegarLoopResult]: For program point L106(line 106) no Hoare annotation was computed. [2020-07-20 17:12:40,408 INFO L271 CegarLoopResult]: At program point L131(lines 5 135) the Hoare annotation is: true [2020-07-20 17:12:40,408 INFO L268 CegarLoopResult]: For program point L90-1(lines 33 130) no Hoare annotation was computed. [2020-07-20 17:12:40,410 INFO L268 CegarLoopResult]: For program point L115-1(lines 33 130) no Hoare annotation was computed. [2020-07-20 17:12:40,410 INFO L268 CegarLoopResult]: For program point L91(line 91) no Hoare annotation was computed. [2020-07-20 17:12:40,411 INFO L268 CegarLoopResult]: For program point L116(line 116) no Hoare annotation was computed. [2020-07-20 17:12:40,411 INFO L268 CegarLoopResult]: For program point L100-1(lines 33 130) no Hoare annotation was computed. [2020-07-20 17:12:40,411 INFO L271 CegarLoopResult]: At program point L125-1(lines 33 130) the Hoare annotation is: true [2020-07-20 17:12:40,412 INFO L268 CegarLoopResult]: For program point L84-1(lines 33 130) no Hoare annotation was computed. [2020-07-20 17:12:40,412 INFO L268 CegarLoopResult]: For program point L76-1(lines 33 130) no Hoare annotation was computed. [2020-07-20 17:12:40,412 INFO L268 CegarLoopResult]: For program point L101(line 101) no Hoare annotation was computed. [2020-07-20 17:12:40,412 INFO L268 CegarLoopResult]: For program point L35(lines 35 37) no Hoare annotation was computed. [2020-07-20 17:12:40,413 INFO L268 CegarLoopResult]: For program point L68-1(lines 33 130) no Hoare annotation was computed. [2020-07-20 17:12:40,441 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 05:12:40 BoogieIcfgContainer [2020-07-20 17:12:40,441 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 17:12:40,452 INFO L168 Benchmark]: Toolchain (without parser) took 10695.66 ms. Allocated memory was 136.8 MB in the beginning and 292.0 MB in the end (delta: 155.2 MB). Free memory was 99.4 MB in the beginning and 87.0 MB in the end (delta: 12.4 MB). Peak memory consumption was 167.6 MB. Max. memory is 7.1 GB. [2020-07-20 17:12:40,457 INFO L168 Benchmark]: CDTParser took 0.37 ms. Allocated memory is still 136.8 MB. Free memory was 118.0 MB in the beginning and 117.8 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-20 17:12:40,461 INFO L168 Benchmark]: CACSL2BoogieTranslator took 378.22 ms. Allocated memory is still 136.8 MB. Free memory was 99.0 MB in the beginning and 88.5 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. [2020-07-20 17:12:40,467 INFO L168 Benchmark]: Boogie Preprocessor took 157.32 ms. Allocated memory was 136.8 MB in the beginning and 201.9 MB in the end (delta: 65.0 MB). Free memory was 88.5 MB in the beginning and 179.9 MB in the end (delta: -91.4 MB). Peak memory consumption was 13.2 MB. Max. memory is 7.1 GB. [2020-07-20 17:12:40,468 INFO L168 Benchmark]: RCFGBuilder took 449.29 ms. Allocated memory is still 201.9 MB. Free memory was 179.9 MB in the beginning and 161.9 MB in the end (delta: 18.0 MB). Peak memory consumption was 18.0 MB. Max. memory is 7.1 GB. [2020-07-20 17:12:40,469 INFO L168 Benchmark]: TraceAbstraction took 9699.84 ms. Allocated memory was 201.9 MB in the beginning and 292.0 MB in the end (delta: 90.2 MB). Free memory was 161.2 MB in the beginning and 87.0 MB in the end (delta: 74.3 MB). Peak memory consumption was 164.4 MB. Max. memory is 7.1 GB. [2020-07-20 17:12:40,477 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.37 ms. Allocated memory is still 136.8 MB. Free memory was 118.0 MB in the beginning and 117.8 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 378.22 ms. Allocated memory is still 136.8 MB. Free memory was 99.0 MB in the beginning and 88.5 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 157.32 ms. Allocated memory was 136.8 MB in the beginning and 201.9 MB in the end (delta: 65.0 MB). Free memory was 88.5 MB in the beginning and 179.9 MB in the end (delta: -91.4 MB). Peak memory consumption was 13.2 MB. Max. memory is 7.1 GB. * RCFGBuilder took 449.29 ms. Allocated memory is still 201.9 MB. Free memory was 179.9 MB in the beginning and 161.9 MB in the end (delta: 18.0 MB). Peak memory consumption was 18.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 9699.84 ms. Allocated memory was 201.9 MB in the beginning and 292.0 MB in the end (delta: 90.2 MB). Free memory was 161.2 MB in the beginning and 87.0 MB in the end (delta: 74.3 MB). Peak memory consumption was 164.4 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 133]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 33]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 5]: Loop Invariant Derived loop invariant: 0 - InvariantResult [Line: 5]: Loop Invariant Derived loop invariant: 1 - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 38 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 9.4s, OverallIterations: 23, TraceHistogramMax: 1, AutomataDifference: 1.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.1s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 1573 SDtfs, 755 SDslu, 1056 SDs, 0 SdLazy, 121 SolverSat, 23 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 475 GetRequests, 452 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=3016occurred in iteration=21, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.9s AutomataMinimizationTime, 23 MinimizatonAttempts, 790 StatesRemovedByMinimization, 21 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 7 PreInvPairs, 266 NumberOfFragments, 7 HoareAnnotationTreeSize, 7 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.5s SatisfiabilityAnalysisTime, 0.4s InterpolantComputationTime, 498 NumberOfCodeBlocks, 495 NumberOfCodeBlocksAsserted, 91 NumberOfCheckSat, 475 ConstructedInterpolants, 0 QuantifiedInterpolants, 19027 SizeOfPredicates, 0 NumberOfNonLiveVariables, 2129 ConjunctsInSsa, 69 ConjunctsInUnsatCore, 23 InterpolantComputations, 23 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...