/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_FUNCTIONS --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_11.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 13:50:06,063 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 13:50:06,065 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 13:50:06,083 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 13:50:06,084 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 13:50:06,085 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 13:50:06,086 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 13:50:06,088 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 13:50:06,090 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 13:50:06,090 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 13:50:06,091 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 13:50:06,093 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 13:50:06,093 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 13:50:06,094 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 13:50:06,095 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 13:50:06,096 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 13:50:06,097 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 13:50:06,098 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 13:50:06,100 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 13:50:06,102 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 13:50:06,104 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 13:50:06,105 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 13:50:06,106 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 13:50:06,107 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 13:50:06,110 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 13:50:06,118 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 13:50:06,119 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 13:50:06,119 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 13:50:06,121 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 13:50:06,137 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 13:50:06,138 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 13:50:06,139 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 13:50:06,139 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 13:50:06,140 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 13:50:06,140 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 13:50:06,140 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 13:50:06,140 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 13:50:06,141 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 13:50:06,141 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 13:50:06,141 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 13:50:06,141 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 13:50:06,141 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 13:50:06,142 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 13:50:06,142 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 13:50:06,142 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 13:50:06,142 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 13:50:06,143 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 13:50:06,143 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 13:50:06,143 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 13:50:06,143 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 13:50:06,143 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 13:50:06,144 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 13:50:06,144 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 13:50:06,144 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 13:50:06,144 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 13:50:06,144 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:06,145 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 13:50:06,145 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 13:50:06,145 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_FUNCTIONS 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 13:50:06,488 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 13:50:06,504 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 13:50:06,508 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 13:50:06,510 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 13:50:06,510 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 13:50:06,511 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/locks/test_locks_11.c [2020-07-20 13:50:06,588 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/01b2f8d7f/e343843a47594b1ca85d058ea462fe54/FLAGb0b1ae7cf [2020-07-20 13:50:07,149 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 13:50:07,150 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/locks/test_locks_11.c [2020-07-20 13:50:07,164 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/01b2f8d7f/e343843a47594b1ca85d058ea462fe54/FLAGb0b1ae7cf [2020-07-20 13:50:07,421 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/01b2f8d7f/e343843a47594b1ca85d058ea462fe54 [2020-07-20 13:50:07,435 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 13:50:07,440 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 13:50:07,441 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 13:50:07,442 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 13:50:07,446 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 13:50:07,447 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:50:07" (1/1) ... [2020-07-20 13:50:07,451 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2c9bb858 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:07, skipping insertion in model container [2020-07-20 13:50:07,451 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:50:07" (1/1) ... [2020-07-20 13:50:07,461 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 13:50:07,500 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 13:50:07,761 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:50:07,767 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 13:50:07,798 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:50:07,816 INFO L208 MainTranslator]: Completed translation [2020-07-20 13:50:07,817 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:07 WrapperNode [2020-07-20 13:50:07,817 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 13:50:07,819 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 13:50:07,819 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 13:50:07,819 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 13:50:07,959 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:07" (1/1) ... [2020-07-20 13:50:07,959 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:07" (1/1) ... [2020-07-20 13:50:07,970 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:07" (1/1) ... [2020-07-20 13:50:07,971 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:07" (1/1) ... [2020-07-20 13:50:07,993 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:07" (1/1) ... [2020-07-20 13:50:08,006 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:07" (1/1) ... [2020-07-20 13:50:08,007 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:07" (1/1) ... [2020-07-20 13:50:08,013 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 13:50:08,014 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 13:50:08,014 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 13:50:08,014 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 13:50:08,015 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:07" (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 13:50:08,091 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 13:50:08,091 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 13:50:08,091 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 13:50:08,091 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 13:50:08,092 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 13:50:08,092 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 13:50:08,092 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 13:50:08,092 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 13:50:08,482 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 13:50:08,483 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 13:50:08,492 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:50:08 BoogieIcfgContainer [2020-07-20 13:50:08,492 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 13:50:08,512 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 13:50:08,512 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 13:50:08,518 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 13:50:08,519 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 01:50:07" (1/3) ... [2020-07-20 13:50:08,520 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@636ec423 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:50:08, skipping insertion in model container [2020-07-20 13:50:08,521 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:07" (2/3) ... [2020-07-20 13:50:08,521 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@636ec423 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:50:08, skipping insertion in model container [2020-07-20 13:50:08,521 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:50:08" (3/3) ... [2020-07-20 13:50:08,524 INFO L109 eAbstractionObserver]: Analyzing ICFG test_locks_11.c [2020-07-20 13:50:08,536 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 13:50:08,544 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 13:50:08,559 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 13:50:08,587 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 13:50:08,587 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 13:50:08,587 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 13:50:08,588 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 13:50:08,588 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 13:50:08,589 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 13:50:08,589 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 13:50:08,589 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 13:50:08,612 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states. [2020-07-20 13:50:08,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 13:50:08,620 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:08,621 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 13:50:08,622 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:08,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:08,629 INFO L82 PathProgramCache]: Analyzing trace with hash -316470182, now seen corresponding path program 1 times [2020-07-20 13:50:08,639 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:08,640 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1349633366] [2020-07-20 13:50:08,641 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 13:50:08,758 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:08,759 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:08,762 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:08,769 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:08,830 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 13:50:08,831 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:08,837 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1349633366] [2020-07-20 13:50:08,837 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:08,838 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:08,840 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1584717017] [2020-07-20 13:50:08,847 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:08,847 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:08,863 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:08,864 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:08,866 INFO L87 Difference]: Start difference. First operand 47 states. Second operand 3 states. [2020-07-20 13:50:08,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:08,925 INFO L93 Difference]: Finished difference Result 93 states and 162 transitions. [2020-07-20 13:50:08,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:08,928 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-20 13:50:08,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:08,944 INFO L225 Difference]: With dead ends: 93 [2020-07-20 13:50:08,945 INFO L226 Difference]: Without dead ends: 78 [2020-07-20 13:50:08,953 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 13:50:08,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-20 13:50:09,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 54. [2020-07-20 13:50:09,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-07-20 13:50:09,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 97 transitions. [2020-07-20 13:50:09,017 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 97 transitions. Word has length 21 [2020-07-20 13:50:09,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:09,018 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 97 transitions. [2020-07-20 13:50:09,018 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:09,018 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 97 transitions. [2020-07-20 13:50:09,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 13:50:09,020 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:09,020 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 13:50:09,227 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:09,228 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:09,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:09,230 INFO L82 PathProgramCache]: Analyzing trace with hash -1327587432, now seen corresponding path program 1 times [2020-07-20 13:50:09,230 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:09,230 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [419038220] [2020-07-20 13:50:09,231 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 13:50:09,312 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:50:09,313 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:09,314 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:09,317 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:09,333 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 13:50:09,334 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:09,334 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [419038220] [2020-07-20 13:50:09,335 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:09,335 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:09,336 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [114700968] [2020-07-20 13:50:09,338 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:09,339 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:09,339 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:09,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:09,340 INFO L87 Difference]: Start difference. First operand 54 states and 97 transitions. Second operand 3 states. [2020-07-20 13:50:09,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:09,375 INFO L93 Difference]: Finished difference Result 127 states and 232 transitions. [2020-07-20 13:50:09,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:09,376 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-20 13:50:09,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:09,378 INFO L225 Difference]: With dead ends: 127 [2020-07-20 13:50:09,378 INFO L226 Difference]: Without dead ends: 78 [2020-07-20 13:50:09,380 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 13:50:09,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-20 13:50:09,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 76. [2020-07-20 13:50:09,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-20 13:50:09,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 137 transitions. [2020-07-20 13:50:09,393 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 137 transitions. Word has length 21 [2020-07-20 13:50:09,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:09,394 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 137 transitions. [2020-07-20 13:50:09,394 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:09,394 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 137 transitions. [2020-07-20 13:50:09,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 13:50:09,396 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:09,396 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 13:50:09,610 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:09,610 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:09,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:09,611 INFO L82 PathProgramCache]: Analyzing trace with hash -1220427994, now seen corresponding path program 1 times [2020-07-20 13:50:09,611 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:09,612 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1032283195] [2020-07-20 13:50:09,612 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 13:50:09,689 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:09,690 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:09,691 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:09,693 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:09,704 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 13:50:09,704 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:09,705 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1032283195] [2020-07-20 13:50:09,705 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:09,705 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:09,706 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [79043182] [2020-07-20 13:50:09,706 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:09,707 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:09,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:09,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:09,708 INFO L87 Difference]: Start difference. First operand 76 states and 137 transitions. Second operand 3 states. [2020-07-20 13:50:09,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:09,732 INFO L93 Difference]: Finished difference Result 145 states and 263 transitions. [2020-07-20 13:50:09,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:09,733 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-20 13:50:09,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:09,736 INFO L225 Difference]: With dead ends: 145 [2020-07-20 13:50:09,736 INFO L226 Difference]: Without dead ends: 143 [2020-07-20 13:50:09,737 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 13:50:09,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2020-07-20 13:50:09,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 101. [2020-07-20 13:50:09,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-07-20 13:50:09,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 183 transitions. [2020-07-20 13:50:09,752 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 183 transitions. Word has length 22 [2020-07-20 13:50:09,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:09,752 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 183 transitions. [2020-07-20 13:50:09,753 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:09,753 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 183 transitions. [2020-07-20 13:50:09,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 13:50:09,754 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:09,754 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 13:50:09,968 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:09,969 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:09,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:09,970 INFO L82 PathProgramCache]: Analyzing trace with hash 2063422052, now seen corresponding path program 1 times [2020-07-20 13:50:09,970 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:09,970 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [175147386] [2020-07-20 13:50:09,971 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 13:50:10,044 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:50:10,044 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:10,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:10,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:10,069 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 13:50:10,069 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:10,070 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [175147386] [2020-07-20 13:50:10,070 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:10,071 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:10,071 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1380519264] [2020-07-20 13:50:10,072 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:10,072 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:10,072 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:10,073 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:10,073 INFO L87 Difference]: Start difference. First operand 101 states and 183 transitions. Second operand 3 states. [2020-07-20 13:50:10,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:10,095 INFO L93 Difference]: Finished difference Result 154 states and 275 transitions. [2020-07-20 13:50:10,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:10,096 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-20 13:50:10,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:10,098 INFO L225 Difference]: With dead ends: 154 [2020-07-20 13:50:10,098 INFO L226 Difference]: Without dead ends: 106 [2020-07-20 13:50:10,099 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 13:50:10,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-07-20 13:50:10,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 104. [2020-07-20 13:50:10,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2020-07-20 13:50:10,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 184 transitions. [2020-07-20 13:50:10,135 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 184 transitions. Word has length 22 [2020-07-20 13:50:10,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:10,136 INFO L479 AbstractCegarLoop]: Abstraction has 104 states and 184 transitions. [2020-07-20 13:50:10,136 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:10,136 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 184 transitions. [2020-07-20 13:50:10,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 13:50:10,137 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:10,138 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 13:50:10,339 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:10,340 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:10,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:10,341 INFO L82 PathProgramCache]: Analyzing trace with hash 783558374, now seen corresponding path program 1 times [2020-07-20 13:50:10,341 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:10,342 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1134397015] [2020-07-20 13:50:10,342 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 13:50:10,395 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:50:10,396 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:10,397 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:10,399 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:10,411 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 13:50:10,411 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:10,412 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1134397015] [2020-07-20 13:50:10,412 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:10,413 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:10,414 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [348423831] [2020-07-20 13:50:10,414 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:10,415 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:10,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:10,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:10,416 INFO L87 Difference]: Start difference. First operand 104 states and 184 transitions. Second operand 3 states. [2020-07-20 13:50:10,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:10,445 INFO L93 Difference]: Finished difference Result 244 states and 438 transitions. [2020-07-20 13:50:10,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:10,445 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-20 13:50:10,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:10,447 INFO L225 Difference]: With dead ends: 244 [2020-07-20 13:50:10,448 INFO L226 Difference]: Without dead ends: 148 [2020-07-20 13:50:10,451 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 13:50:10,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2020-07-20 13:50:10,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 146. [2020-07-20 13:50:10,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 146 states. [2020-07-20 13:50:10,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 258 transitions. [2020-07-20 13:50:10,468 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 258 transitions. Word has length 22 [2020-07-20 13:50:10,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:10,469 INFO L479 AbstractCegarLoop]: Abstraction has 146 states and 258 transitions. [2020-07-20 13:50:10,469 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:10,469 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 258 transitions. [2020-07-20 13:50:10,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-20 13:50:10,471 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:10,471 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 13:50:10,687 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:10,688 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:10,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:10,689 INFO L82 PathProgramCache]: Analyzing trace with hash -199417107, now seen corresponding path program 1 times [2020-07-20 13:50:10,690 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:10,690 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2044965648] [2020-07-20 13:50:10,691 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 13:50:10,740 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:10,740 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:10,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:10,743 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:10,760 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 13:50:10,760 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:10,761 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2044965648] [2020-07-20 13:50:10,761 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:10,761 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:10,762 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1410942550] [2020-07-20 13:50:10,762 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:10,763 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:10,763 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:10,763 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:10,764 INFO L87 Difference]: Start difference. First operand 146 states and 258 transitions. Second operand 3 states. [2020-07-20 13:50:10,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:10,784 INFO L93 Difference]: Finished difference Result 274 states and 490 transitions. [2020-07-20 13:50:10,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:10,785 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-20 13:50:10,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:10,787 INFO L225 Difference]: With dead ends: 274 [2020-07-20 13:50:10,787 INFO L226 Difference]: Without dead ends: 272 [2020-07-20 13:50:10,788 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 13:50:10,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 272 states. [2020-07-20 13:50:10,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 272 to 198. [2020-07-20 13:50:10,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 198 states. [2020-07-20 13:50:10,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 348 transitions. [2020-07-20 13:50:10,809 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 348 transitions. Word has length 23 [2020-07-20 13:50:10,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:10,809 INFO L479 AbstractCegarLoop]: Abstraction has 198 states and 348 transitions. [2020-07-20 13:50:10,810 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:10,810 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 348 transitions. [2020-07-20 13:50:10,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-20 13:50:10,812 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:10,812 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 13:50:11,027 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:11,028 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:11,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:11,029 INFO L82 PathProgramCache]: Analyzing trace with hash -1210534357, now seen corresponding path program 1 times [2020-07-20 13:50:11,029 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:11,030 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1852865170] [2020-07-20 13:50:11,030 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 13:50:11,076 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:50:11,077 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:11,078 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:11,080 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:11,094 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 13:50:11,094 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:11,095 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1852865170] [2020-07-20 13:50:11,095 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:11,095 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:11,095 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [953936606] [2020-07-20 13:50:11,096 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:11,096 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:11,096 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:11,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:11,097 INFO L87 Difference]: Start difference. First operand 198 states and 348 transitions. Second operand 3 states. [2020-07-20 13:50:11,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:11,116 INFO L93 Difference]: Finished difference Result 296 states and 518 transitions. [2020-07-20 13:50:11,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:11,117 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-20 13:50:11,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:11,119 INFO L225 Difference]: With dead ends: 296 [2020-07-20 13:50:11,119 INFO L226 Difference]: Without dead ends: 202 [2020-07-20 13:50:11,120 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 13:50:11,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2020-07-20 13:50:11,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 200. [2020-07-20 13:50:11,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 200 states. [2020-07-20 13:50:11,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 346 transitions. [2020-07-20 13:50:11,133 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 346 transitions. Word has length 23 [2020-07-20 13:50:11,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:11,133 INFO L479 AbstractCegarLoop]: Abstraction has 200 states and 346 transitions. [2020-07-20 13:50:11,133 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:11,134 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 346 transitions. [2020-07-20 13:50:11,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-20 13:50:11,135 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:11,136 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, 1, 1] [2020-07-20 13:50:11,349 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:11,350 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:11,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:11,351 INFO L82 PathProgramCache]: Analyzing trace with hash 1804569261, now seen corresponding path program 1 times [2020-07-20 13:50:11,351 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:11,352 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1018053825] [2020-07-20 13:50:11,352 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 13:50:11,401 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:50:11,401 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:11,403 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:11,404 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:11,419 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 13:50:11,419 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:11,420 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1018053825] [2020-07-20 13:50:11,420 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:11,420 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:11,420 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2089089059] [2020-07-20 13:50:11,421 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:11,421 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:11,422 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:11,422 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:11,422 INFO L87 Difference]: Start difference. First operand 200 states and 346 transitions. Second operand 3 states. [2020-07-20 13:50:11,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:11,464 INFO L93 Difference]: Finished difference Result 472 states and 824 transitions. [2020-07-20 13:50:11,465 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:11,465 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-20 13:50:11,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:11,468 INFO L225 Difference]: With dead ends: 472 [2020-07-20 13:50:11,468 INFO L226 Difference]: Without dead ends: 282 [2020-07-20 13:50:11,474 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 13:50:11,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 282 states. [2020-07-20 13:50:11,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 282 to 280. [2020-07-20 13:50:11,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 280 states. [2020-07-20 13:50:11,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 280 states to 280 states and 482 transitions. [2020-07-20 13:50:11,502 INFO L78 Accepts]: Start accepts. Automaton has 280 states and 482 transitions. Word has length 23 [2020-07-20 13:50:11,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:11,505 INFO L479 AbstractCegarLoop]: Abstraction has 280 states and 482 transitions. [2020-07-20 13:50:11,505 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:11,506 INFO L276 IsEmpty]: Start isEmpty. Operand 280 states and 482 transitions. [2020-07-20 13:50:11,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-20 13:50:11,512 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:11,512 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 13:50:11,728 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:11,729 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:11,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:11,730 INFO L82 PathProgramCache]: Analyzing trace with hash 1387149659, now seen corresponding path program 1 times [2020-07-20 13:50:11,730 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:11,731 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [987801006] [2020-07-20 13:50:11,732 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 13:50:11,772 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:11,773 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:11,774 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:11,780 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:11,800 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 13:50:11,800 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:11,801 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [987801006] [2020-07-20 13:50:11,801 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:11,801 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:11,802 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [637752382] [2020-07-20 13:50:11,802 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:11,802 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:11,803 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:11,803 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:11,803 INFO L87 Difference]: Start difference. First operand 280 states and 482 transitions. Second operand 3 states. [2020-07-20 13:50:11,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:11,832 INFO L93 Difference]: Finished difference Result 520 states and 908 transitions. [2020-07-20 13:50:11,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:11,833 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-20 13:50:11,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:11,838 INFO L225 Difference]: With dead ends: 520 [2020-07-20 13:50:11,839 INFO L226 Difference]: Without dead ends: 518 [2020-07-20 13:50:11,840 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 13:50:11,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 518 states. [2020-07-20 13:50:11,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 518 to 388. [2020-07-20 13:50:11,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 388 states. [2020-07-20 13:50:11,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 388 states to 388 states and 658 transitions. [2020-07-20 13:50:11,858 INFO L78 Accepts]: Start accepts. Automaton has 388 states and 658 transitions. Word has length 24 [2020-07-20 13:50:11,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:11,858 INFO L479 AbstractCegarLoop]: Abstraction has 388 states and 658 transitions. [2020-07-20 13:50:11,858 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:11,859 INFO L276 IsEmpty]: Start isEmpty. Operand 388 states and 658 transitions. [2020-07-20 13:50:11,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-20 13:50:11,860 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:11,860 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 13:50:12,069 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:12,070 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:12,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:12,070 INFO L82 PathProgramCache]: Analyzing trace with hash 376032409, now seen corresponding path program 1 times [2020-07-20 13:50:12,071 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:12,071 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1016927713] [2020-07-20 13:50:12,071 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 13:50:12,118 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:50:12,119 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:12,120 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:12,128 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:12,142 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 13:50:12,142 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:12,143 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1016927713] [2020-07-20 13:50:12,143 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:12,143 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:12,144 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [572156702] [2020-07-20 13:50:12,144 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:12,144 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:12,145 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:12,145 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:12,145 INFO L87 Difference]: Start difference. First operand 388 states and 658 transitions. Second operand 3 states. [2020-07-20 13:50:12,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:12,177 INFO L93 Difference]: Finished difference Result 580 states and 980 transitions. [2020-07-20 13:50:12,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:12,178 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-20 13:50:12,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:12,181 INFO L225 Difference]: With dead ends: 580 [2020-07-20 13:50:12,181 INFO L226 Difference]: Without dead ends: 394 [2020-07-20 13:50:12,183 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 13:50:12,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 394 states. [2020-07-20 13:50:12,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 394 to 392. [2020-07-20 13:50:12,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 392 states. [2020-07-20 13:50:12,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 392 states to 392 states and 654 transitions. [2020-07-20 13:50:12,199 INFO L78 Accepts]: Start accepts. Automaton has 392 states and 654 transitions. Word has length 24 [2020-07-20 13:50:12,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:12,200 INFO L479 AbstractCegarLoop]: Abstraction has 392 states and 654 transitions. [2020-07-20 13:50:12,200 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:12,200 INFO L276 IsEmpty]: Start isEmpty. Operand 392 states and 654 transitions. [2020-07-20 13:50:12,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-20 13:50:12,202 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:12,202 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 13:50:12,418 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:12,419 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:12,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:12,420 INFO L82 PathProgramCache]: Analyzing trace with hash -903831269, now seen corresponding path program 1 times [2020-07-20 13:50:12,420 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:12,421 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [529594332] [2020-07-20 13:50:12,421 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 13:50:12,472 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:50:12,473 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:12,474 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:12,476 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:12,489 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 13:50:12,490 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:12,491 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [529594332] [2020-07-20 13:50:12,492 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:12,492 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:12,492 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [423929650] [2020-07-20 13:50:12,493 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:12,493 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:12,494 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:12,494 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:12,495 INFO L87 Difference]: Start difference. First operand 392 states and 654 transitions. Second operand 3 states. [2020-07-20 13:50:12,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:12,539 INFO L93 Difference]: Finished difference Result 924 states and 1552 transitions. [2020-07-20 13:50:12,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:12,540 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-20 13:50:12,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:12,545 INFO L225 Difference]: With dead ends: 924 [2020-07-20 13:50:12,549 INFO L226 Difference]: Without dead ends: 546 [2020-07-20 13:50:12,552 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 13:50:12,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 546 states. [2020-07-20 13:50:12,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 546 to 544. [2020-07-20 13:50:12,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 544 states. [2020-07-20 13:50:12,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 544 states to 544 states and 902 transitions. [2020-07-20 13:50:12,612 INFO L78 Accepts]: Start accepts. Automaton has 544 states and 902 transitions. Word has length 24 [2020-07-20 13:50:12,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:12,612 INFO L479 AbstractCegarLoop]: Abstraction has 544 states and 902 transitions. [2020-07-20 13:50:12,613 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:12,613 INFO L276 IsEmpty]: Start isEmpty. Operand 544 states and 902 transitions. [2020-07-20 13:50:12,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 13:50:12,619 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:12,620 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 13:50:12,834 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:12,835 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:12,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:12,836 INFO L82 PathProgramCache]: Analyzing trace with hash -968887806, now seen corresponding path program 1 times [2020-07-20 13:50:12,836 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:12,837 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1030855495] [2020-07-20 13:50:12,837 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 13:50:12,890 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 13:50:12,890 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:12,891 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:12,898 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:12,905 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 13:50:12,906 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:12,906 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1030855495] [2020-07-20 13:50:12,907 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:12,907 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:12,907 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [229502733] [2020-07-20 13:50:12,908 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:12,908 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:12,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:12,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:12,908 INFO L87 Difference]: Start difference. First operand 544 states and 902 transitions. Second operand 3 states. [2020-07-20 13:50:12,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:12,935 INFO L93 Difference]: Finished difference Result 996 states and 1680 transitions. [2020-07-20 13:50:12,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:12,935 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-20 13:50:12,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:12,942 INFO L225 Difference]: With dead ends: 996 [2020-07-20 13:50:12,942 INFO L226 Difference]: Without dead ends: 994 [2020-07-20 13:50:12,944 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 13:50:12,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 994 states. [2020-07-20 13:50:12,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 994 to 768. [2020-07-20 13:50:12,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 768 states. [2020-07-20 13:50:12,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 768 states to 768 states and 1246 transitions. [2020-07-20 13:50:12,970 INFO L78 Accepts]: Start accepts. Automaton has 768 states and 1246 transitions. Word has length 25 [2020-07-20 13:50:12,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:12,970 INFO L479 AbstractCegarLoop]: Abstraction has 768 states and 1246 transitions. [2020-07-20 13:50:12,970 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:12,971 INFO L276 IsEmpty]: Start isEmpty. Operand 768 states and 1246 transitions. [2020-07-20 13:50:12,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 13:50:12,973 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:12,973 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 13:50:13,187 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:13,188 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:13,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:13,189 INFO L82 PathProgramCache]: Analyzing trace with hash -1980005056, now seen corresponding path program 1 times [2020-07-20 13:50:13,189 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:13,189 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [676616104] [2020-07-20 13:50:13,190 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 13:50:13,229 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:13,230 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:13,231 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:13,232 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:13,242 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 13:50:13,243 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:13,244 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [676616104] [2020-07-20 13:50:13,244 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:13,244 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:13,244 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [319727199] [2020-07-20 13:50:13,245 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:13,245 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:13,246 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:13,246 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:13,246 INFO L87 Difference]: Start difference. First operand 768 states and 1246 transitions. Second operand 3 states. [2020-07-20 13:50:13,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:13,284 INFO L93 Difference]: Finished difference Result 1812 states and 2960 transitions. [2020-07-20 13:50:13,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:13,285 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-20 13:50:13,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:13,293 INFO L225 Difference]: With dead ends: 1812 [2020-07-20 13:50:13,293 INFO L226 Difference]: Without dead ends: 1058 [2020-07-20 13:50:13,296 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 13:50:13,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1058 states. [2020-07-20 13:50:13,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1058 to 1056. [2020-07-20 13:50:13,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1056 states. [2020-07-20 13:50:13,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1056 states to 1056 states and 1702 transitions. [2020-07-20 13:50:13,342 INFO L78 Accepts]: Start accepts. Automaton has 1056 states and 1702 transitions. Word has length 25 [2020-07-20 13:50:13,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:13,343 INFO L479 AbstractCegarLoop]: Abstraction has 1056 states and 1702 transitions. [2020-07-20 13:50:13,343 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:13,343 INFO L276 IsEmpty]: Start isEmpty. Operand 1056 states and 1702 transitions. [2020-07-20 13:50:13,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 13:50:13,346 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:13,346 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, 1] [2020-07-20 13:50:13,560 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:13,561 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:13,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:13,562 INFO L82 PathProgramCache]: Analyzing trace with hash 29463506, now seen corresponding path program 1 times [2020-07-20 13:50:13,563 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:13,563 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [249709626] [2020-07-20 13:50:13,564 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 13:50:13,622 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 13:50:13,623 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:13,624 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:13,626 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:13,641 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 13:50:13,641 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:13,642 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [249709626] [2020-07-20 13:50:13,642 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:13,642 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:13,643 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1828496123] [2020-07-20 13:50:13,643 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:13,644 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:13,644 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:13,644 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:13,645 INFO L87 Difference]: Start difference. First operand 1056 states and 1702 transitions. Second operand 3 states. [2020-07-20 13:50:13,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:13,697 INFO L93 Difference]: Finished difference Result 1908 states and 3128 transitions. [2020-07-20 13:50:13,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:13,698 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-20 13:50:13,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:13,714 INFO L225 Difference]: With dead ends: 1908 [2020-07-20 13:50:13,714 INFO L226 Difference]: Without dead ends: 1906 [2020-07-20 13:50:13,717 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 24 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 13:50:13,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1906 states. [2020-07-20 13:50:13,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1906 to 1520. [2020-07-20 13:50:13,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1520 states. [2020-07-20 13:50:13,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1520 states to 1520 states and 2390 transitions. [2020-07-20 13:50:13,800 INFO L78 Accepts]: Start accepts. Automaton has 1520 states and 2390 transitions. Word has length 26 [2020-07-20 13:50:13,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:13,802 INFO L479 AbstractCegarLoop]: Abstraction has 1520 states and 2390 transitions. [2020-07-20 13:50:13,802 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:13,802 INFO L276 IsEmpty]: Start isEmpty. Operand 1520 states and 2390 transitions. [2020-07-20 13:50:13,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 13:50:13,809 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:13,809 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, 1, 1, 1, 1, 1] [2020-07-20 13:50:14,022 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:14,024 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:14,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:14,024 INFO L82 PathProgramCache]: Analyzing trace with hash -981653744, now seen corresponding path program 1 times [2020-07-20 13:50:14,025 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:14,025 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1836406438] [2020-07-20 13:50:14,025 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 13:50:14,082 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:14,083 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:14,084 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:14,090 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:14,098 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 13:50:14,098 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:14,098 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1836406438] [2020-07-20 13:50:14,099 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:14,099 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:14,099 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1218844739] [2020-07-20 13:50:14,100 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:14,100 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:14,100 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:14,102 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:14,103 INFO L87 Difference]: Start difference. First operand 1520 states and 2390 transitions. Second operand 3 states. [2020-07-20 13:50:14,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:14,169 INFO L93 Difference]: Finished difference Result 3572 states and 5656 transitions. [2020-07-20 13:50:14,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:14,170 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-20 13:50:14,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:14,187 INFO L225 Difference]: With dead ends: 3572 [2020-07-20 13:50:14,187 INFO L226 Difference]: Without dead ends: 2066 [2020-07-20 13:50:14,196 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 24 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 13:50:14,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2066 states. [2020-07-20 13:50:14,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2066 to 2064. [2020-07-20 13:50:14,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2064 states. [2020-07-20 13:50:14,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2064 states to 2064 states and 3222 transitions. [2020-07-20 13:50:14,292 INFO L78 Accepts]: Start accepts. Automaton has 2064 states and 3222 transitions. Word has length 26 [2020-07-20 13:50:14,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:14,292 INFO L479 AbstractCegarLoop]: Abstraction has 2064 states and 3222 transitions. [2020-07-20 13:50:14,292 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:14,294 INFO L276 IsEmpty]: Start isEmpty. Operand 2064 states and 3222 transitions. [2020-07-20 13:50:14,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 13:50:14,299 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:14,299 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, 1, 1] [2020-07-20 13:50:14,514 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:14,515 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:14,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:14,516 INFO L82 PathProgramCache]: Analyzing trace with hash 913583447, now seen corresponding path program 1 times [2020-07-20 13:50:14,516 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:14,517 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [318696148] [2020-07-20 13:50:14,517 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 13:50:14,612 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 13:50:14,613 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:14,614 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:14,615 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:14,623 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 13:50:14,624 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:14,624 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [318696148] [2020-07-20 13:50:14,624 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:14,624 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:14,625 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [96187942] [2020-07-20 13:50:14,630 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:14,630 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:14,631 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:14,631 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:14,631 INFO L87 Difference]: Start difference. First operand 2064 states and 3222 transitions. Second operand 3 states. [2020-07-20 13:50:14,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:14,713 INFO L93 Difference]: Finished difference Result 3668 states and 5816 transitions. [2020-07-20 13:50:14,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:14,714 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-20 13:50:14,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:14,742 INFO L225 Difference]: With dead ends: 3668 [2020-07-20 13:50:14,742 INFO L226 Difference]: Without dead ends: 3666 [2020-07-20 13:50:14,746 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 25 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 13:50:14,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3666 states. [2020-07-20 13:50:14,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3666 to 3024. [2020-07-20 13:50:14,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3024 states. [2020-07-20 13:50:14,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3024 states to 3024 states and 4598 transitions. [2020-07-20 13:50:14,907 INFO L78 Accepts]: Start accepts. Automaton has 3024 states and 4598 transitions. Word has length 27 [2020-07-20 13:50:14,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:14,908 INFO L479 AbstractCegarLoop]: Abstraction has 3024 states and 4598 transitions. [2020-07-20 13:50:14,908 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:14,908 INFO L276 IsEmpty]: Start isEmpty. Operand 3024 states and 4598 transitions. [2020-07-20 13:50:14,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 13:50:14,918 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:14,918 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, 1, 1] [2020-07-20 13:50:15,131 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:15,132 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:15,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:15,133 INFO L82 PathProgramCache]: Analyzing trace with hash -97533803, now seen corresponding path program 1 times [2020-07-20 13:50:15,133 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:15,134 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1434037931] [2020-07-20 13:50:15,134 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 13:50:15,182 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:15,183 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:15,184 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:15,185 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:15,192 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 13:50:15,192 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:15,192 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1434037931] [2020-07-20 13:50:15,193 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:15,193 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:15,193 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [618873977] [2020-07-20 13:50:15,194 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:15,194 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:15,194 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:15,195 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:15,195 INFO L87 Difference]: Start difference. First operand 3024 states and 4598 transitions. Second operand 3 states. [2020-07-20 13:50:15,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:15,279 INFO L93 Difference]: Finished difference Result 7060 states and 10808 transitions. [2020-07-20 13:50:15,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:15,280 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-20 13:50:15,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:15,304 INFO L225 Difference]: With dead ends: 7060 [2020-07-20 13:50:15,305 INFO L226 Difference]: Without dead ends: 4050 [2020-07-20 13:50:15,313 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 25 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 13:50:15,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4050 states. [2020-07-20 13:50:15,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4050 to 4048. [2020-07-20 13:50:15,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4048 states. [2020-07-20 13:50:15,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4048 states to 4048 states and 6102 transitions. [2020-07-20 13:50:15,455 INFO L78 Accepts]: Start accepts. Automaton has 4048 states and 6102 transitions. Word has length 27 [2020-07-20 13:50:15,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:15,455 INFO L479 AbstractCegarLoop]: Abstraction has 4048 states and 6102 transitions. [2020-07-20 13:50:15,455 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:15,455 INFO L276 IsEmpty]: Start isEmpty. Operand 4048 states and 6102 transitions. [2020-07-20 13:50:15,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-20 13:50:15,463 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:15,463 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, 1, 1, 1] [2020-07-20 13:50:15,679 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:15,679 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:15,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:15,680 INFO L82 PathProgramCache]: Analyzing trace with hash -1743469113, now seen corresponding path program 1 times [2020-07-20 13:50:15,681 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:15,681 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [742628538] [2020-07-20 13:50:15,682 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 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 13:50:15,759 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:15,760 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:15,761 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:15,765 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:15,780 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 13:50:15,781 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:15,781 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [742628538] [2020-07-20 13:50:15,781 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:15,782 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:15,785 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1732674591] [2020-07-20 13:50:15,786 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:15,786 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:15,787 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:15,787 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:15,788 INFO L87 Difference]: Start difference. First operand 4048 states and 6102 transitions. Second operand 3 states. [2020-07-20 13:50:15,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:15,919 INFO L93 Difference]: Finished difference Result 11988 states and 18008 transitions. [2020-07-20 13:50:15,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:15,919 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 28 [2020-07-20 13:50:15,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:15,988 INFO L225 Difference]: With dead ends: 11988 [2020-07-20 13:50:15,989 INFO L226 Difference]: Without dead ends: 7954 [2020-07-20 13:50:16,003 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 26 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 13:50:16,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7954 states. [2020-07-20 13:50:16,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7954 to 7952. [2020-07-20 13:50:16,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7952 states. [2020-07-20 13:50:16,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7952 states to 7952 states and 11670 transitions. [2020-07-20 13:50:16,304 INFO L78 Accepts]: Start accepts. Automaton has 7952 states and 11670 transitions. Word has length 28 [2020-07-20 13:50:16,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:16,305 INFO L479 AbstractCegarLoop]: Abstraction has 7952 states and 11670 transitions. [2020-07-20 13:50:16,305 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:16,305 INFO L276 IsEmpty]: Start isEmpty. Operand 7952 states and 11670 transitions. [2020-07-20 13:50:16,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-20 13:50:16,320 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:16,320 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, 1, 1, 1] [2020-07-20 13:50:16,534 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:16,534 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:16,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:16,535 INFO L82 PathProgramCache]: Analyzing trace with hash -732351863, now seen corresponding path program 1 times [2020-07-20 13:50:16,535 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:16,535 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1030019294] [2020-07-20 13:50:16,536 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 13:50:16,595 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 13:50:16,596 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:16,597 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:16,598 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:16,606 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 13:50:16,606 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:16,607 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1030019294] [2020-07-20 13:50:16,607 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:16,607 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:16,607 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [340992917] [2020-07-20 13:50:16,608 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:16,608 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:16,608 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:16,609 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:16,609 INFO L87 Difference]: Start difference. First operand 7952 states and 11670 transitions. Second operand 3 states. [2020-07-20 13:50:16,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:16,765 INFO L93 Difference]: Finished difference Result 8980 states and 13464 transitions. [2020-07-20 13:50:16,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:16,766 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 28 [2020-07-20 13:50:16,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:16,796 INFO L225 Difference]: With dead ends: 8980 [2020-07-20 13:50:16,796 INFO L226 Difference]: Without dead ends: 8978 [2020-07-20 13:50:16,804 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 26 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 13:50:16,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8978 states. [2020-07-20 13:50:17,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8978 to 7952. [2020-07-20 13:50:17,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7952 states. [2020-07-20 13:50:17,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7952 states to 7952 states and 11542 transitions. [2020-07-20 13:50:17,099 INFO L78 Accepts]: Start accepts. Automaton has 7952 states and 11542 transitions. Word has length 28 [2020-07-20 13:50:17,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:17,100 INFO L479 AbstractCegarLoop]: Abstraction has 7952 states and 11542 transitions. [2020-07-20 13:50:17,100 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:17,100 INFO L276 IsEmpty]: Start isEmpty. Operand 7952 states and 11542 transitions. [2020-07-20 13:50:17,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-20 13:50:17,114 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:17,114 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, 1, 1, 1, 1] [2020-07-20 13:50:17,328 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:17,328 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:17,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:17,329 INFO L82 PathProgramCache]: Analyzing trace with hash 1787247788, now seen corresponding path program 1 times [2020-07-20 13:50:17,330 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:17,330 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [42209607] [2020-07-20 13:50:17,330 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 13:50:17,365 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 13:50:17,366 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:17,367 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:17,368 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:17,374 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 13:50:17,374 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:17,375 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [42209607] [2020-07-20 13:50:17,375 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:17,375 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:17,375 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [205055701] [2020-07-20 13:50:17,376 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:17,376 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:17,377 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:17,377 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:17,377 INFO L87 Difference]: Start difference. First operand 7952 states and 11542 transitions. Second operand 3 states. [2020-07-20 13:50:17,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:17,546 INFO L93 Difference]: Finished difference Result 13588 states and 19864 transitions. [2020-07-20 13:50:17,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:17,546 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 29 [2020-07-20 13:50:17,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:17,587 INFO L225 Difference]: With dead ends: 13588 [2020-07-20 13:50:17,588 INFO L226 Difference]: Without dead ends: 13586 [2020-07-20 13:50:17,599 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 27 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 13:50:17,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13586 states. [2020-07-20 13:50:18,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13586 to 12048. [2020-07-20 13:50:18,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12048 states. [2020-07-20 13:50:18,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12048 states to 12048 states and 17046 transitions. [2020-07-20 13:50:18,056 INFO L78 Accepts]: Start accepts. Automaton has 12048 states and 17046 transitions. Word has length 29 [2020-07-20 13:50:18,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:18,056 INFO L479 AbstractCegarLoop]: Abstraction has 12048 states and 17046 transitions. [2020-07-20 13:50:18,056 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:18,056 INFO L276 IsEmpty]: Start isEmpty. Operand 12048 states and 17046 transitions. [2020-07-20 13:50:18,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-20 13:50:18,081 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:18,081 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, 1, 1, 1, 1] [2020-07-20 13:50:18,295 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:18,296 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:18,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:18,297 INFO L82 PathProgramCache]: Analyzing trace with hash 776130538, now seen corresponding path program 1 times [2020-07-20 13:50:18,297 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:18,297 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1162692424] [2020-07-20 13:50:18,297 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 13:50:18,339 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:18,339 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:18,340 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:18,342 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:18,355 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 13:50:18,355 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:18,356 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1162692424] [2020-07-20 13:50:18,356 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:18,356 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:18,357 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1938304836] [2020-07-20 13:50:18,357 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:18,357 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:18,358 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:18,358 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:18,358 INFO L87 Difference]: Start difference. First operand 12048 states and 17046 transitions. Second operand 3 states. [2020-07-20 13:50:18,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:18,499 INFO L93 Difference]: Finished difference Result 17948 states and 25256 transitions. [2020-07-20 13:50:18,500 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:18,500 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 29 [2020-07-20 13:50:18,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:18,546 INFO L225 Difference]: With dead ends: 17948 [2020-07-20 13:50:18,547 INFO L226 Difference]: Without dead ends: 12058 [2020-07-20 13:50:18,573 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 27 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 13:50:18,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12058 states. [2020-07-20 13:50:19,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12058 to 12056. [2020-07-20 13:50:19,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12056 states. [2020-07-20 13:50:19,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12056 states to 12056 states and 16678 transitions. [2020-07-20 13:50:19,413 INFO L78 Accepts]: Start accepts. Automaton has 12056 states and 16678 transitions. Word has length 29 [2020-07-20 13:50:19,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:19,413 INFO L479 AbstractCegarLoop]: Abstraction has 12056 states and 16678 transitions. [2020-07-20 13:50:19,413 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:19,414 INFO L276 IsEmpty]: Start isEmpty. Operand 12056 states and 16678 transitions. [2020-07-20 13:50:19,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-20 13:50:19,439 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:19,439 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, 1, 1, 1, 1] [2020-07-20 13:50:19,652 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:19,653 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:19,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:19,654 INFO L82 PathProgramCache]: Analyzing trace with hash -912813204, now seen corresponding path program 1 times [2020-07-20 13:50:19,654 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:19,655 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [557914293] [2020-07-20 13:50:19,655 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 13:50:19,694 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:19,694 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:19,695 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:19,697 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:19,707 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 13:50:19,708 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:19,708 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [557914293] [2020-07-20 13:50:19,708 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:19,709 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:19,709 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1292730993] [2020-07-20 13:50:19,709 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:19,709 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:19,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:19,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:19,711 INFO L87 Difference]: Start difference. First operand 12056 states and 16678 transitions. Second operand 3 states. [2020-07-20 13:50:19,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:19,914 INFO L93 Difference]: Finished difference Result 27676 states and 38440 transitions. [2020-07-20 13:50:19,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:19,915 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 29 [2020-07-20 13:50:19,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:19,969 INFO L225 Difference]: With dead ends: 27676 [2020-07-20 13:50:19,969 INFO L226 Difference]: Without dead ends: 15642 [2020-07-20 13:50:20,015 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 27 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 13:50:20,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15642 states. [2020-07-20 13:50:20,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15642 to 15640. [2020-07-20 13:50:20,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15640 states. [2020-07-20 13:50:20,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15640 states to 15640 states and 21286 transitions. [2020-07-20 13:50:20,507 INFO L78 Accepts]: Start accepts. Automaton has 15640 states and 21286 transitions. Word has length 29 [2020-07-20 13:50:20,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:20,508 INFO L479 AbstractCegarLoop]: Abstraction has 15640 states and 21286 transitions. [2020-07-20 13:50:20,508 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:20,508 INFO L276 IsEmpty]: Start isEmpty. Operand 15640 states and 21286 transitions. [2020-07-20 13:50:20,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-07-20 13:50:20,534 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:20,534 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, 1, 1, 1, 1, 1] [2020-07-20 13:50:20,749 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:20,750 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:20,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:20,751 INFO L82 PathProgramCache]: Analyzing trace with hash -1247326086, now seen corresponding path program 1 times [2020-07-20 13:50:20,752 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:20,753 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [485722929] [2020-07-20 13:50:20,753 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 13:50:20,789 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 13:50:20,790 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:20,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:20,792 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:20,797 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 13:50:20,797 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:20,798 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [485722929] [2020-07-20 13:50:20,799 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:20,799 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:20,799 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1679269033] [2020-07-20 13:50:20,800 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:20,800 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:20,800 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:20,800 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:20,800 INFO L87 Difference]: Start difference. First operand 15640 states and 21286 transitions. Second operand 3 states. [2020-07-20 13:50:21,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:21,074 INFO L93 Difference]: Finished difference Result 26140 states and 35624 transitions. [2020-07-20 13:50:21,075 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:21,075 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 30 [2020-07-20 13:50:21,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:21,168 INFO L225 Difference]: With dead ends: 26140 [2020-07-20 13:50:21,168 INFO L226 Difference]: Without dead ends: 26138 [2020-07-20 13:50:21,189 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 28 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 13:50:21,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26138 states. [2020-07-20 13:50:21,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26138 to 24088. [2020-07-20 13:50:21,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24088 states. [2020-07-20 13:50:21,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24088 states to 24088 states and 32038 transitions. [2020-07-20 13:50:21,905 INFO L78 Accepts]: Start accepts. Automaton has 24088 states and 32038 transitions. Word has length 30 [2020-07-20 13:50:21,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:21,906 INFO L479 AbstractCegarLoop]: Abstraction has 24088 states and 32038 transitions. [2020-07-20 13:50:21,906 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:21,906 INFO L276 IsEmpty]: Start isEmpty. Operand 24088 states and 32038 transitions. [2020-07-20 13:50:21,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-07-20 13:50:21,956 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:21,956 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, 1, 1, 1, 1, 1] [2020-07-20 13:50:22,171 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:22,172 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:22,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:22,173 INFO L82 PathProgramCache]: Analyzing trace with hash 2036523960, now seen corresponding path program 1 times [2020-07-20 13:50:22,173 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:22,174 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [693967485] [2020-07-20 13:50:22,174 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 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:22,227 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:22,227 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:22,228 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:22,229 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:22,236 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 13:50:22,236 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:22,237 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [693967485] [2020-07-20 13:50:22,237 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:22,237 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:22,237 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1079794121] [2020-07-20 13:50:22,238 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:22,238 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:22,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:22,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:22,240 INFO L87 Difference]: Start difference. First operand 24088 states and 32038 transitions. Second operand 3 states. [2020-07-20 13:50:22,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:22,855 INFO L93 Difference]: Finished difference Result 54812 states and 73000 transitions. [2020-07-20 13:50:22,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:22,856 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 30 [2020-07-20 13:50:22,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:22,929 INFO L225 Difference]: With dead ends: 54812 [2020-07-20 13:50:22,929 INFO L226 Difference]: Without dead ends: 30746 [2020-07-20 13:50:22,992 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 28 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 13:50:23,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30746 states. [2020-07-20 13:50:23,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30746 to 30744. [2020-07-20 13:50:23,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30744 states. [2020-07-20 13:50:23,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30744 states to 30744 states and 39974 transitions. [2020-07-20 13:50:23,665 INFO L78 Accepts]: Start accepts. Automaton has 30744 states and 39974 transitions. Word has length 30 [2020-07-20 13:50:23,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:23,665 INFO L479 AbstractCegarLoop]: Abstraction has 30744 states and 39974 transitions. [2020-07-20 13:50:23,666 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:23,666 INFO L276 IsEmpty]: Start isEmpty. Operand 30744 states and 39974 transitions. [2020-07-20 13:50:23,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-20 13:50:23,707 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:23,707 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, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:23,921 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:23,922 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:23,922 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:23,923 INFO L82 PathProgramCache]: Analyzing trace with hash -12186877, now seen corresponding path program 1 times [2020-07-20 13:50:23,923 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:23,923 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [65933355] [2020-07-20 13:50:23,924 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 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:23,970 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 13:50:23,971 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:23,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:23,973 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:23,978 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 13:50:23,979 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:23,979 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [65933355] [2020-07-20 13:50:23,979 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:23,979 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:23,980 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [176852759] [2020-07-20 13:50:23,980 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:23,980 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:23,980 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:23,981 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:23,981 INFO L87 Difference]: Start difference. First operand 30744 states and 39974 transitions. Second operand 3 states. [2020-07-20 13:50:25,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:25,396 INFO L93 Difference]: Finished difference Result 50202 states and 64551 transitions. [2020-07-20 13:50:25,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:25,397 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 31 [2020-07-20 13:50:25,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:25,508 INFO L225 Difference]: With dead ends: 50202 [2020-07-20 13:50:25,509 INFO L226 Difference]: Without dead ends: 50200 [2020-07-20 13:50:25,535 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 29 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 13:50:25,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50200 states. [2020-07-20 13:50:26,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50200 to 48152. [2020-07-20 13:50:26,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48152 states. [2020-07-20 13:50:26,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48152 states to 48152 states and 61478 transitions. [2020-07-20 13:50:26,512 INFO L78 Accepts]: Start accepts. Automaton has 48152 states and 61478 transitions. Word has length 31 [2020-07-20 13:50:26,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:26,512 INFO L479 AbstractCegarLoop]: Abstraction has 48152 states and 61478 transitions. [2020-07-20 13:50:26,512 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:26,512 INFO L276 IsEmpty]: Start isEmpty. Operand 48152 states and 61478 transitions. [2020-07-20 13:50:26,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-20 13:50:26,558 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:26,558 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, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:26,771 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:26,772 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:26,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:26,773 INFO L82 PathProgramCache]: Analyzing trace with hash -1023304127, now seen corresponding path program 1 times [2020-07-20 13:50:26,774 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:26,774 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2028633950] [2020-07-20 13:50:26,775 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 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:26,830 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:26,830 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:26,831 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:26,833 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:26,846 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 13:50:26,847 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:26,847 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2028633950] [2020-07-20 13:50:26,851 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:26,852 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:26,852 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [586325219] [2020-07-20 13:50:26,853 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:26,853 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:26,854 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:26,854 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:26,855 INFO L87 Difference]: Start difference. First operand 48152 states and 61478 transitions. Second operand 3 states. [2020-07-20 13:50:27,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:27,931 INFO L93 Difference]: Finished difference Result 108568 states and 138278 transitions. [2020-07-20 13:50:27,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:27,932 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 31 [2020-07-20 13:50:27,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:27,932 INFO L225 Difference]: With dead ends: 108568 [2020-07-20 13:50:27,933 INFO L226 Difference]: Without dead ends: 0 [2020-07-20 13:50:28,047 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 29 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 13:50:28,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-20 13:50:28,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-20 13:50:28,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-20 13:50:28,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-20 13:50:28,048 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 31 [2020-07-20 13:50:28,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:28,048 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-20 13:50:28,049 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:28,049 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-20 13:50:28,049 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-20 13:50:28,263 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:28,267 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-20 13:50:28,332 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-20 13:50:28,333 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-20 13:50:28,333 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-20 13:50:28,333 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-20 13:50:28,333 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-20 13:50:28,333 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-20 13:50:28,334 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 4 177) no Hoare annotation was computed. [2020-07-20 13:50:28,334 INFO L268 CegarLoopResult]: For program point L118(line 118) no Hoare annotation was computed. [2020-07-20 13:50:28,334 INFO L268 CegarLoopResult]: For program point L143(line 143) no Hoare annotation was computed. [2020-07-20 13:50:28,334 INFO L268 CegarLoopResult]: For program point L44(lines 44 46) no Hoare annotation was computed. [2020-07-20 13:50:28,334 INFO L268 CegarLoopResult]: For program point L168(line 168) no Hoare annotation was computed. [2020-07-20 13:50:28,334 INFO L264 CegarLoopResult]: At program point L168-1(lines 5 177) the Hoare annotation is: false [2020-07-20 13:50:28,335 INFO L268 CegarLoopResult]: For program point L127-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 13:50:28,335 INFO L268 CegarLoopResult]: For program point L152-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 13:50:28,335 INFO L268 CegarLoopResult]: For program point L111-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 13:50:28,335 INFO L268 CegarLoopResult]: For program point L103-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 13:50:28,335 INFO L268 CegarLoopResult]: For program point L128(line 128) no Hoare annotation was computed. [2020-07-20 13:50:28,335 INFO L268 CegarLoopResult]: For program point L95-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 13:50:28,335 INFO L268 CegarLoopResult]: For program point L153(line 153) no Hoare annotation was computed. [2020-07-20 13:50:28,336 INFO L268 CegarLoopResult]: For program point L87-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 13:50:28,336 INFO L268 CegarLoopResult]: For program point L79-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 13:50:28,336 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 4 177) no Hoare annotation was computed. [2020-07-20 13:50:28,336 INFO L268 CegarLoopResult]: For program point L137-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 13:50:28,336 INFO L268 CegarLoopResult]: For program point L71(lines 71 73) no Hoare annotation was computed. [2020-07-20 13:50:28,336 INFO L268 CegarLoopResult]: For program point L71-2(lines 42 172) no Hoare annotation was computed. [2020-07-20 13:50:28,336 INFO L268 CegarLoopResult]: For program point L162-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 13:50:28,337 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 175) no Hoare annotation was computed. [2020-07-20 13:50:28,337 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 4 177) the Hoare annotation is: true [2020-07-20 13:50:28,337 INFO L268 CegarLoopResult]: For program point L138(line 138) no Hoare annotation was computed. [2020-07-20 13:50:28,337 INFO L268 CegarLoopResult]: For program point L163(line 163) no Hoare annotation was computed. [2020-07-20 13:50:28,337 INFO L268 CegarLoopResult]: For program point L122-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 13:50:28,337 INFO L268 CegarLoopResult]: For program point L147-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 13:50:28,337 INFO L268 CegarLoopResult]: For program point L123(line 123) no Hoare annotation was computed. [2020-07-20 13:50:28,338 INFO L268 CegarLoopResult]: For program point L148(line 148) no Hoare annotation was computed. [2020-07-20 13:50:28,338 INFO L271 CegarLoopResult]: At program point L173(lines 5 177) the Hoare annotation is: true [2020-07-20 13:50:28,338 INFO L268 CegarLoopResult]: For program point L107-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 13:50:28,338 INFO L268 CegarLoopResult]: For program point L132-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 13:50:28,338 INFO L268 CegarLoopResult]: For program point L99-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 13:50:28,338 INFO L268 CegarLoopResult]: For program point L157-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 13:50:28,338 INFO L268 CegarLoopResult]: For program point L91-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 13:50:28,338 INFO L268 CegarLoopResult]: For program point L83-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 13:50:28,338 INFO L268 CegarLoopResult]: For program point L75-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 13:50:28,339 INFO L268 CegarLoopResult]: For program point L133(line 133) no Hoare annotation was computed. [2020-07-20 13:50:28,339 INFO L268 CegarLoopResult]: For program point L158(line 158) no Hoare annotation was computed. [2020-07-20 13:50:28,339 INFO L268 CegarLoopResult]: For program point L117-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 13:50:28,339 INFO L268 CegarLoopResult]: For program point L142-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 13:50:28,339 INFO L271 CegarLoopResult]: At program point L167-1(lines 42 172) the Hoare annotation is: true [2020-07-20 13:50:28,354 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 01:50:28 BoogieIcfgContainer [2020-07-20 13:50:28,354 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 13:50:28,357 INFO L168 Benchmark]: Toolchain (without parser) took 20919.04 ms. Allocated memory was 143.1 MB in the beginning and 898.1 MB in the end (delta: 755.0 MB). Free memory was 99.3 MB in the beginning and 597.6 MB in the end (delta: -498.3 MB). Peak memory consumption was 256.7 MB. Max. memory is 7.1 GB. [2020-07-20 13:50:28,359 INFO L168 Benchmark]: CDTParser took 0.30 ms. Allocated memory is still 143.1 MB. Free memory was 118.1 MB in the beginning and 117.9 MB in the end (delta: 209.9 kB). Peak memory consumption was 209.9 kB. Max. memory is 7.1 GB. [2020-07-20 13:50:28,360 INFO L168 Benchmark]: CACSL2BoogieTranslator took 376.45 ms. Allocated memory is still 143.1 MB. Free memory was 98.9 MB in the beginning and 88.0 MB in the end (delta: 10.9 MB). Peak memory consumption was 10.9 MB. Max. memory is 7.1 GB. [2020-07-20 13:50:28,360 INFO L168 Benchmark]: Boogie Preprocessor took 194.85 ms. Allocated memory was 143.1 MB in the beginning and 200.3 MB in the end (delta: 57.1 MB). Free memory was 88.0 MB in the beginning and 177.8 MB in the end (delta: -89.8 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. [2020-07-20 13:50:28,360 INFO L168 Benchmark]: RCFGBuilder took 478.60 ms. Allocated memory is still 200.3 MB. Free memory was 177.8 MB in the beginning and 157.3 MB in the end (delta: 20.4 MB). Peak memory consumption was 20.4 MB. Max. memory is 7.1 GB. [2020-07-20 13:50:28,361 INFO L168 Benchmark]: TraceAbstraction took 19842.73 ms. Allocated memory was 200.3 MB in the beginning and 898.1 MB in the end (delta: 697.8 MB). Free memory was 157.3 MB in the beginning and 597.6 MB in the end (delta: -440.3 MB). Peak memory consumption was 257.5 MB. Max. memory is 7.1 GB. [2020-07-20 13:50:28,366 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.30 ms. Allocated memory is still 143.1 MB. Free memory was 118.1 MB in the beginning and 117.9 MB in the end (delta: 209.9 kB). Peak memory consumption was 209.9 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 376.45 ms. Allocated memory is still 143.1 MB. Free memory was 98.9 MB in the beginning and 88.0 MB in the end (delta: 10.9 MB). Peak memory consumption was 10.9 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 194.85 ms. Allocated memory was 143.1 MB in the beginning and 200.3 MB in the end (delta: 57.1 MB). Free memory was 88.0 MB in the beginning and 177.8 MB in the end (delta: -89.8 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. * RCFGBuilder took 478.60 ms. Allocated memory is still 200.3 MB. Free memory was 177.8 MB in the beginning and 157.3 MB in the end (delta: 20.4 MB). Peak memory consumption was 20.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 19842.73 ms. Allocated memory was 200.3 MB in the beginning and 898.1 MB in the end (delta: 697.8 MB). Free memory was 157.3 MB in the beginning and 597.6 MB in the end (delta: -440.3 MB). Peak memory consumption was 257.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 175]: 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: 42]: 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, 47 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 19.6s, OverallIterations: 26, TraceHistogramMax: 1, AutomataDifference: 6.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 2390 SDtfs, 1158 SDslu, 1660 SDs, 0 SdLazy, 140 SolverSat, 26 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 644 GetRequests, 618 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=48152occurred in iteration=25, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 5.5s AutomataMinimizationTime, 26 MinimizatonAttempts, 8214 StatesRemovedByMinimization, 25 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 7 PreInvPairs, 2058 NumberOfFragments, 7 HoareAnnotationTreeSize, 7 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.2s SsaConstructionTime, 0.6s SatisfiabilityAnalysisTime, 0.4s InterpolantComputationTime, 670 NumberOfCodeBlocks, 515 NumberOfCodeBlocksAsserted, 78 NumberOfCheckSat, 644 ConstructedInterpolants, 0 QuantifiedInterpolants, 31960 SizeOfPredicates, 0 NumberOfNonLiveVariables, 2897 ConjunctsInSsa, 78 ConjunctsInUnsatCore, 26 InterpolantComputations, 26 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...