/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_7-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 16:01:58,027 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 16:01:58,031 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 16:01:58,051 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 16:01:58,052 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 16:01:58,053 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 16:01:58,056 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 16:01:58,058 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 16:01:58,061 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 16:01:58,062 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 16:01:58,064 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 16:01:58,066 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 16:01:58,067 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 16:01:58,069 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 16:01:58,070 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 16:01:58,072 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 16:01:58,074 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 16:01:58,075 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 16:01:58,078 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 16:01:58,082 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 16:01:58,084 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 16:01:58,086 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 16:01:58,088 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 16:01:58,090 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 16:01:58,098 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 16:01:58,128 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 16:01:58,130 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 16:01:58,133 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 16:01:58,135 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 16:01:58,174 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 16:01:58,174 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 16:01:58,178 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 16:01:58,178 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 16:01:58,179 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 16:01:58,179 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 16:01:58,179 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 16:01:58,179 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 16:01:58,179 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 16:01:58,180 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 16:01:58,181 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 16:01:58,182 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 16:01:58,182 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 16:01:58,183 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 16:01:58,183 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 16:01:58,183 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 16:01:58,183 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 16:01:58,184 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 16:01:58,184 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 16:01:58,184 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 16:01:58,184 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 16:01:58,184 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:01:58,185 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 16:01:58,185 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 16:01:58,185 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 16:01:58,185 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 16:01:58,186 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:58,186 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 16:01:58,186 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 16:01:58,186 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 16:01:58,570 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 16:01:58,588 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 16:01:58,594 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 16:01:58,597 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 16:01:58,598 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 16:01:58,599 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_7-1.c [2020-07-21 16:01:58,722 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/981d4a8b7/c9f5fb0fedc74afb9f00e5a0fa2d51c4/FLAG0440ed158 [2020-07-21 16:01:59,481 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 16:01:59,482 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_7-1.c [2020-07-21 16:01:59,491 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/981d4a8b7/c9f5fb0fedc74afb9f00e5a0fa2d51c4/FLAG0440ed158 [2020-07-21 16:01:59,769 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/981d4a8b7/c9f5fb0fedc74afb9f00e5a0fa2d51c4 [2020-07-21 16:01:59,779 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 16:01:59,783 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 16:01:59,784 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 16:01:59,785 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 16:01:59,790 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 16:01:59,791 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:01:59" (1/1) ... [2020-07-21 16:01:59,797 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@600803b9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:01:59, skipping insertion in model container [2020-07-21 16:01:59,798 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:01:59" (1/1) ... [2020-07-21 16:01:59,808 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 16:01:59,828 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 16:02:00,028 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:02:00,034 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 16:02:00,060 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:02:00,081 INFO L208 MainTranslator]: Completed translation [2020-07-21 16:02:00,083 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:02:00 WrapperNode [2020-07-21 16:02:00,083 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 16:02:00,085 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 16:02:00,086 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 16:02:00,086 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 16:02:00,108 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:02:00" (1/1) ... [2020-07-21 16:02:00,110 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:02:00" (1/1) ... [2020-07-21 16:02:00,117 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:02:00" (1/1) ... [2020-07-21 16:02:00,118 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:02:00" (1/1) ... [2020-07-21 16:02:00,123 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:02:00" (1/1) ... [2020-07-21 16:02:00,126 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:02:00" (1/1) ... [2020-07-21 16:02:00,127 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:02:00" (1/1) ... [2020-07-21 16:02:00,130 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 16:02:00,131 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 16:02:00,131 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 16:02:00,131 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 16:02:00,133 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:02:00" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:02:00,320 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 16:02:00,320 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 16:02:00,321 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-21 16:02:00,321 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 16:02:00,321 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 16:02:00,321 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 16:02:00,321 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-21 16:02:00,321 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 16:02:00,322 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 16:02:00,322 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 16:02:00,557 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 16:02:00,558 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 16:02:00,564 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:02:00 BoogieIcfgContainer [2020-07-21 16:02:00,565 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 16:02:00,567 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 16:02:00,568 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 16:02:00,574 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 16:02:00,574 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 04:01:59" (1/3) ... [2020-07-21 16:02:00,576 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@64e9aeed and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:02:00, skipping insertion in model container [2020-07-21 16:02:00,577 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:02:00" (2/3) ... [2020-07-21 16:02:00,578 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@64e9aeed and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:02:00, skipping insertion in model container [2020-07-21 16:02:00,578 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:02:00" (3/3) ... [2020-07-21 16:02:00,582 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_7-1.c [2020-07-21 16:02:00,608 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 16:02:00,651 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 16:02:00,684 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 16:02:00,739 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 16:02:00,740 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 16:02:00,740 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 16:02:00,741 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 16:02:00,741 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 16:02:00,741 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 16:02:00,741 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 16:02:00,741 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 16:02:00,796 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-21 16:02:00,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 16:02:00,820 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:00,822 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:00,822 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:00,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:00,833 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-21 16:02:00,847 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:00,848 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [469417613] [2020-07-21 16:02:00,849 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:00,936 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:02:00,936 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:00,940 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 16:02:00,948 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:01,079 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:02:01,080 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:02:01,082 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [469417613] [2020-07-21 16:02:01,083 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:02:01,084 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 16:02:01,085 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2040067761] [2020-07-21 16:02:01,093 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 16:02:01,094 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:01,110 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 16:02:01,111 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 16:02:01,114 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-21 16:02:01,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:01,259 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-21 16:02:01,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 16:02:01,262 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 16:02:01,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:01,277 INFO L225 Difference]: With dead ends: 35 [2020-07-21 16:02:01,278 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 16:02:01,284 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 16:02:01,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 16:02:01,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 16:02:01,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 16:02:01,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 16:02:01,356 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-21 16:02:01,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:01,357 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 16:02:01,358 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 16:02:01,358 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 16:02:01,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 16:02:01,361 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:01,361 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:01,570 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:01,571 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:01,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:01,572 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-21 16:02:01,573 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:01,573 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [577204598] [2020-07-21 16:02:01,574 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:01,615 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:02:01,615 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:01,616 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 16:02:01,618 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:01,669 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:02:01,671 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:02:01,672 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [577204598] [2020-07-21 16:02:01,673 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:02:01,673 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 16:02:01,674 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [498321263] [2020-07-21 16:02:01,682 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 16:02:01,682 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:01,683 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 16:02:01,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 16:02:01,685 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-21 16:02:01,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:01,798 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-21 16:02:01,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 16:02:01,799 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 16:02:01,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:01,801 INFO L225 Difference]: With dead ends: 27 [2020-07-21 16:02:01,802 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 16:02:01,803 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 16:02:01,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 16:02:01,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-21 16:02:01,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 16:02:01,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 16:02:01,815 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-21 16:02:01,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:01,815 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 16:02:01,816 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 16:02:01,816 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 16:02:01,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 16:02:01,818 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:01,818 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:02,031 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:02,033 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:02,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:02,035 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-21 16:02:02,036 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:02,036 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [608406564] [2020-07-21 16:02:02,036 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:02,078 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:02:02,079 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:02,080 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 16:02:02,083 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:02,161 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 16:02:02,161 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:02,438 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:02,506 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 16:02:02,507 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [608406564] [2020-07-21 16:02:02,508 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:02,508 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 16:02:02,508 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1563806126] [2020-07-21 16:02:02,509 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 16:02:02,510 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:02,511 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 16:02:02,511 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 16:02:02,512 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-21 16:02:02,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:02,686 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-21 16:02:02,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 16:02:02,687 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-21 16:02:02,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:02,689 INFO L225 Difference]: With dead ends: 32 [2020-07-21 16:02:02,690 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 16:02:02,691 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 16:02:02,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 16:02:02,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-21 16:02:02,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 16:02:02,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 16:02:02,704 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-21 16:02:02,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:02,705 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 16:02:02,705 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 16:02:02,706 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 16:02:02,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 16:02:02,708 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:02,709 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:02,924 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:02,926 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:02,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:02,926 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-21 16:02:02,927 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:02,928 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1848496398] [2020-07-21 16:02:02,928 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:02,965 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:02:02,965 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:02,966 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 16:02:02,969 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:03,039 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 16:02:03,039 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:03,227 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:03,276 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 16:02:03,277 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1848496398] [2020-07-21 16:02:03,277 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:03,278 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 16:02:03,278 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1808107775] [2020-07-21 16:02:03,279 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 16:02:03,279 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:03,280 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 16:02:03,280 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 16:02:03,280 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-21 16:02:03,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:03,406 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-21 16:02:03,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 16:02:03,407 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-21 16:02:03,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:03,410 INFO L225 Difference]: With dead ends: 37 [2020-07-21 16:02:03,411 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 16:02:03,412 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 16:02:03,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 16:02:03,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-21 16:02:03,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 16:02:03,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 16:02:03,426 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-21 16:02:03,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:03,426 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 16:02:03,426 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 16:02:03,427 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 16:02:03,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 16:02:03,429 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:03,429 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:03,639 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:03,640 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:03,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:03,641 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-21 16:02:03,642 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:03,643 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [89521971] [2020-07-21 16:02:03,643 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:03,698 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:02:03,698 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:03,700 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 16:02:03,703 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:03,764 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 16:02:03,765 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:04,094 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:04,096 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:04,173 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:04,176 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:04,231 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 16:02:04,232 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [89521971] [2020-07-21 16:02:04,233 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:04,233 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 16:02:04,234 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1845951646] [2020-07-21 16:02:04,235 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 16:02:04,235 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:04,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 16:02:04,236 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 16:02:04,236 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-21 16:02:04,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:04,499 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-21 16:02:04,499 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 16:02:04,500 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-21 16:02:04,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:04,502 INFO L225 Difference]: With dead ends: 42 [2020-07-21 16:02:04,502 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 16:02:04,504 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 64 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 16:02:04,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 16:02:04,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-21 16:02:04,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 16:02:04,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 16:02:04,517 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-21 16:02:04,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:04,518 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 16:02:04,518 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 16:02:04,518 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 16:02:04,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 16:02:04,521 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:04,521 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:04,735 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:04,736 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:04,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:04,737 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-21 16:02:04,738 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:04,738 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1828149984] [2020-07-21 16:02:04,739 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:04,785 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:02:04,785 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:04,787 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 16:02:04,793 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:04,846 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-21 16:02:04,846 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:05,080 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:05,139 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:05,144 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:05,189 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 16:02:05,190 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1828149984] [2020-07-21 16:02:05,191 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:05,191 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 16:02:05,191 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1231641582] [2020-07-21 16:02:05,192 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 16:02:05,193 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:05,193 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 16:02:05,193 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 16:02:05,194 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-21 16:02:05,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:05,395 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-21 16:02:05,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 16:02:05,396 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-21 16:02:05,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:05,399 INFO L225 Difference]: With dead ends: 47 [2020-07-21 16:02:05,400 INFO L226 Difference]: Without dead ends: 43 [2020-07-21 16:02:05,401 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 16:02:05,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-21 16:02:05,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-21 16:02:05,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 16:02:05,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 16:02:05,415 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-21 16:02:05,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:05,416 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 16:02:05,416 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 16:02:05,416 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 16:02:05,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-21 16:02:05,419 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:05,419 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:05,625 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:05,626 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:05,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:05,627 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-21 16:02:05,627 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:05,628 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1179915479] [2020-07-21 16:02:05,629 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:05,680 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:02:05,681 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:05,682 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 16:02:05,686 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:05,761 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 79 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-21 16:02:05,761 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:06,349 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:06,471 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:06,472 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:06,533 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:06,534 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:06,582 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-21 16:02:06,583 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1179915479] [2020-07-21 16:02:06,583 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:06,583 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 16:02:06,584 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1254991165] [2020-07-21 16:02:06,585 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 16:02:06,585 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:06,586 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 16:02:06,586 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 16:02:06,587 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-21 16:02:06,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:06,848 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-21 16:02:06,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:02:06,849 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-21 16:02:06,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:06,855 INFO L225 Difference]: With dead ends: 52 [2020-07-21 16:02:06,856 INFO L226 Difference]: Without dead ends: 48 [2020-07-21 16:02:06,858 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 111 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:02:06,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-21 16:02:06,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-21 16:02:06,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 16:02:06,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 16:02:06,899 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-21 16:02:06,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:06,901 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 16:02:06,903 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 16:02:06,904 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 16:02:06,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-21 16:02:06,915 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:06,915 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:07,131 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:07,133 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:07,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:07,134 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-21 16:02:07,134 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:07,135 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2111267216] [2020-07-21 16:02:07,135 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:07,191 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:02:07,191 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:07,196 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:02:07,204 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:07,379 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 115 proven. 171 refuted. 0 times theorem prover too weak. 141 trivial. 0 not checked. [2020-07-21 16:02:07,379 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:08,153 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:08,247 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:08,320 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:08,624 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:08,625 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:08,684 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:08,753 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 115 proven. 193 refuted. 0 times theorem prover too weak. 119 trivial. 0 not checked. [2020-07-21 16:02:08,754 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2111267216] [2020-07-21 16:02:08,756 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:08,756 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 21 [2020-07-21 16:02:08,757 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1094521303] [2020-07-21 16:02:08,762 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 16:02:08,762 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:08,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 16:02:08,764 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=344, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:02:08,764 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 21 states. [2020-07-21 16:02:09,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:09,467 INFO L93 Difference]: Finished difference Result 94 states and 184 transitions. [2020-07-21 16:02:09,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-21 16:02:09,467 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 96 [2020-07-21 16:02:09,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:09,469 INFO L225 Difference]: With dead ends: 94 [2020-07-21 16:02:09,470 INFO L226 Difference]: Without dead ends: 64 [2020-07-21 16:02:09,473 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 164 SyntacticMatches, 13 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 232 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=351, Invalid=981, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 16:02:09,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-21 16:02:09,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 61. [2020-07-21 16:02:09,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 16:02:09,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 77 transitions. [2020-07-21 16:02:09,487 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 77 transitions. Word has length 96 [2020-07-21 16:02:09,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:09,488 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 77 transitions. [2020-07-21 16:02:09,488 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 16:02:09,488 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 77 transitions. [2020-07-21 16:02:09,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-21 16:02:09,491 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:09,491 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 7, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:09,706 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:09,707 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:09,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:09,709 INFO L82 PathProgramCache]: Analyzing trace with hash 2001184551, now seen corresponding path program 4 times [2020-07-21 16:02:09,709 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:09,710 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1141354751] [2020-07-21 16:02:09,710 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 16:02:09,767 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:02:09,767 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:09,769 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 16:02:09,772 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:09,842 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 17 proven. 88 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-21 16:02:09,843 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:10,267 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:10,362 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:10,406 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:10,443 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 17 proven. 103 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2020-07-21 16:02:10,444 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1141354751] [2020-07-21 16:02:10,444 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:10,444 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 16:02:10,444 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1646244848] [2020-07-21 16:02:10,445 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 16:02:10,445 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:10,446 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 16:02:10,446 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 16:02:10,446 INFO L87 Difference]: Start difference. First operand 61 states and 77 transitions. Second operand 13 states. [2020-07-21 16:02:10,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:10,599 INFO L93 Difference]: Finished difference Result 65 states and 80 transitions. [2020-07-21 16:02:10,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:02:10,600 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 68 [2020-07-21 16:02:10,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:10,602 INFO L225 Difference]: With dead ends: 65 [2020-07-21 16:02:10,602 INFO L226 Difference]: Without dead ends: 61 [2020-07-21 16:02:10,604 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 116 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:02:10,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-07-21 16:02:10,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2020-07-21 16:02:10,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 16:02:10,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 76 transitions. [2020-07-21 16:02:10,614 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 76 transitions. Word has length 68 [2020-07-21 16:02:10,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:10,615 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 76 transitions. [2020-07-21 16:02:10,615 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 16:02:10,615 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 76 transitions. [2020-07-21 16:02:10,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-21 16:02:10,617 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:10,617 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 7, 7, 7, 7, 7, 7, 7, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:10,830 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:10,831 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:10,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:10,832 INFO L82 PathProgramCache]: Analyzing trace with hash 1200034344, now seen corresponding path program 5 times [2020-07-21 16:02:10,832 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:10,832 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1374409942] [2020-07-21 16:02:10,833 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 16:02:10,912 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:02:10,912 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:10,914 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:02:10,918 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:11,004 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 42 proven. 229 refuted. 0 times theorem prover too weak. 299 trivial. 0 not checked. [2020-07-21 16:02:11,004 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:11,595 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:11,740 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:11,742 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:11,821 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:11,868 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:11,911 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 42 proven. 255 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2020-07-21 16:02:11,911 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1374409942] [2020-07-21 16:02:11,911 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:11,912 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 16:02:11,912 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [422459207] [2020-07-21 16:02:11,912 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 16:02:11,913 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:11,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 16:02:11,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 16:02:11,913 INFO L87 Difference]: Start difference. First operand 61 states and 76 transitions. Second operand 15 states. [2020-07-21 16:02:12,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:12,077 INFO L93 Difference]: Finished difference Result 68 states and 84 transitions. [2020-07-21 16:02:12,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 16:02:12,077 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 109 [2020-07-21 16:02:12,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:12,081 INFO L225 Difference]: With dead ends: 68 [2020-07-21 16:02:12,082 INFO L226 Difference]: Without dead ends: 64 [2020-07-21 16:02:12,083 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 194 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-21 16:02:12,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-21 16:02:12,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2020-07-21 16:02:12,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-07-21 16:02:12,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 80 transitions. [2020-07-21 16:02:12,101 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 80 transitions. Word has length 109 [2020-07-21 16:02:12,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:12,104 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 80 transitions. [2020-07-21 16:02:12,104 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 16:02:12,104 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 80 transitions. [2020-07-21 16:02:12,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 219 [2020-07-21 16:02:12,111 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:12,111 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 25, 15, 15, 15, 15, 15, 15, 15, 10, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:12,325 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:12,326 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:12,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:12,327 INFO L82 PathProgramCache]: Analyzing trace with hash 706081956, now seen corresponding path program 6 times [2020-07-21 16:02:12,328 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:12,328 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [386072797] [2020-07-21 16:02:12,329 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 16:02:12,432 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:02:12,432 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:12,434 INFO L263 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 16:02:12,438 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:12,600 INFO L134 CoverageAnalysis]: Checked inductivity of 2580 backedges. 463 proven. 839 refuted. 0 times theorem prover too weak. 1278 trivial. 0 not checked. [2020-07-21 16:02:12,600 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:13,909 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:14,089 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:14,200 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:14,258 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:14,259 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:14,946 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:14,948 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:15,137 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:15,244 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:15,305 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:15,306 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:15,380 INFO L134 CoverageAnalysis]: Checked inductivity of 2580 backedges. 463 proven. 891 refuted. 0 times theorem prover too weak. 1226 trivial. 0 not checked. [2020-07-21 16:02:15,381 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [386072797] [2020-07-21 16:02:15,381 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:15,381 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-21 16:02:15,382 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [803257201] [2020-07-21 16:02:15,383 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 16:02:15,383 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:15,383 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 16:02:15,384 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-21 16:02:15,384 INFO L87 Difference]: Start difference. First operand 64 states and 80 transitions. Second operand 25 states. [2020-07-21 16:02:16,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:16,301 INFO L93 Difference]: Finished difference Result 144 states and 221 transitions. [2020-07-21 16:02:16,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-07-21 16:02:16,303 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 218 [2020-07-21 16:02:16,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:16,307 INFO L225 Difference]: With dead ends: 144 [2020-07-21 16:02:16,308 INFO L226 Difference]: Without dead ends: 88 [2020-07-21 16:02:16,311 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 456 GetRequests, 391 SyntacticMatches, 21 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 422 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=539, Invalid=1531, Unknown=0, NotChecked=0, Total=2070 [2020-07-21 16:02:16,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-21 16:02:16,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 78. [2020-07-21 16:02:16,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-07-21 16:02:16,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 102 transitions. [2020-07-21 16:02:16,329 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 102 transitions. Word has length 218 [2020-07-21 16:02:16,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:16,330 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 102 transitions. [2020-07-21 16:02:16,330 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 16:02:16,331 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 102 transitions. [2020-07-21 16:02:16,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2020-07-21 16:02:16,334 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:16,335 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 20, 12, 12, 12, 12, 12, 12, 12, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:16,549 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:16,550 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:16,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:16,551 INFO L82 PathProgramCache]: Analyzing trace with hash 259499213, now seen corresponding path program 7 times [2020-07-21 16:02:16,552 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:16,552 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1994553158] [2020-07-21 16:02:16,553 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 16:02:16,699 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:02:16,699 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:16,702 INFO L263 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:02:16,707 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:16,810 INFO L134 CoverageAnalysis]: Checked inductivity of 1654 backedges. 93 proven. 533 refuted. 0 times theorem prover too weak. 1028 trivial. 0 not checked. [2020-07-21 16:02:16,811 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:17,872 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:17,873 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:18,196 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:18,376 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:18,377 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:18,488 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:18,540 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:18,595 INFO L134 CoverageAnalysis]: Checked inductivity of 1654 backedges. 93 proven. 573 refuted. 0 times theorem prover too weak. 988 trivial. 0 not checked. [2020-07-21 16:02:18,596 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1994553158] [2020-07-21 16:02:18,596 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:18,597 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 16 [2020-07-21 16:02:18,597 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [172525770] [2020-07-21 16:02:18,598 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 16:02:18,598 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:18,598 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 16:02:18,599 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=169, Unknown=0, NotChecked=0, Total=240 [2020-07-21 16:02:18,599 INFO L87 Difference]: Start difference. First operand 78 states and 102 transitions. Second operand 16 states. [2020-07-21 16:02:18,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:18,846 INFO L93 Difference]: Finished difference Result 85 states and 111 transitions. [2020-07-21 16:02:18,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 16:02:18,847 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 177 [2020-07-21 16:02:18,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:18,849 INFO L225 Difference]: With dead ends: 85 [2020-07-21 16:02:18,850 INFO L226 Difference]: Without dead ends: 81 [2020-07-21 16:02:18,851 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 359 GetRequests, 326 SyntacticMatches, 13 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=161, Invalid=301, Unknown=0, NotChecked=0, Total=462 [2020-07-21 16:02:18,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-07-21 16:02:18,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2020-07-21 16:02:18,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-07-21 16:02:18,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 107 transitions. [2020-07-21 16:02:18,864 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 107 transitions. Word has length 177 [2020-07-21 16:02:18,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:18,865 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 107 transitions. [2020-07-21 16:02:18,865 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 16:02:18,865 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 107 transitions. [2020-07-21 16:02:18,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-21 16:02:18,872 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:18,872 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 33, 20, 20, 20, 20, 20, 20, 20, 13, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:19,085 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:19,086 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:19,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:19,086 INFO L82 PathProgramCache]: Analyzing trace with hash -1425621089, now seen corresponding path program 8 times [2020-07-21 16:02:19,087 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:19,087 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2138102077] [2020-07-21 16:02:19,087 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 16:02:19,273 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:02:19,274 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:19,282 INFO L263 TraceCheckSpWp]: Trace formula consists of 636 conjuncts, 167 conjunts are in the unsatisfiable core [2020-07-21 16:02:19,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:19,861 INFO L134 CoverageAnalysis]: Checked inductivity of 4568 backedges. 0 proven. 1500 refuted. 0 times theorem prover too weak. 3068 trivial. 0 not checked. [2020-07-21 16:02:19,861 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:23,693 INFO L134 CoverageAnalysis]: Checked inductivity of 4568 backedges. 0 proven. 1500 refuted. 0 times theorem prover too weak. 3068 trivial. 0 not checked. [2020-07-21 16:02:23,693 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2138102077] [2020-07-21 16:02:23,694 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:23,694 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 28 [2020-07-21 16:02:23,694 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1953735776] [2020-07-21 16:02:23,697 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-07-21 16:02:23,698 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:23,698 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-07-21 16:02:23,699 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=691, Unknown=0, NotChecked=0, Total=756 [2020-07-21 16:02:23,699 INFO L87 Difference]: Start difference. First operand 81 states and 107 transitions. Second operand 28 states. [2020-07-21 16:02:24,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:24,157 INFO L93 Difference]: Finished difference Result 102 states and 144 transitions. [2020-07-21 16:02:24,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-21 16:02:24,158 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 286 [2020-07-21 16:02:24,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:24,161 INFO L225 Difference]: With dead ends: 102 [2020-07-21 16:02:24,161 INFO L226 Difference]: Without dead ends: 98 [2020-07-21 16:02:24,162 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 571 GetRequests, 534 SyntacticMatches, 11 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 153 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=65, Invalid=691, Unknown=0, NotChecked=0, Total=756 [2020-07-21 16:02:24,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-21 16:02:24,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 91. [2020-07-21 16:02:24,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-07-21 16:02:24,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 130 transitions. [2020-07-21 16:02:24,177 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 130 transitions. Word has length 286 [2020-07-21 16:02:24,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:24,178 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 130 transitions. [2020-07-21 16:02:24,178 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-07-21 16:02:24,178 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 130 transitions. [2020-07-21 16:02:24,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 369 [2020-07-21 16:02:24,182 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:24,183 INFO L422 BasicCegarLoop]: trace histogram [53, 53, 43, 26, 26, 26, 26, 26, 26, 26, 17, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:24,397 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:24,397 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:24,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:24,398 INFO L82 PathProgramCache]: Analyzing trace with hash -120387169, now seen corresponding path program 9 times [2020-07-21 16:02:24,399 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:24,399 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [56881837] [2020-07-21 16:02:24,399 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 16:02:24,572 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:02:24,572 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:24,575 INFO L263 TraceCheckSpWp]: Trace formula consists of 553 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 16:02:24,586 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:24,884 INFO L134 CoverageAnalysis]: Checked inductivity of 7715 backedges. 1165 proven. 2000 refuted. 0 times theorem prover too weak. 4550 trivial. 0 not checked. [2020-07-21 16:02:24,885 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:27,646 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:28,098 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:28,100 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:28,428 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:28,429 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:28,626 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:28,628 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:28,759 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:28,760 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:28,823 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:28,825 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:30,089 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:30,093 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:30,448 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:30,449 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:30,635 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:30,743 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:30,820 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:30,821 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:30,961 INFO L134 CoverageAnalysis]: Checked inductivity of 7715 backedges. 1165 proven. 2097 refuted. 0 times theorem prover too weak. 4453 trivial. 0 not checked. [2020-07-21 16:02:30,962 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [56881837] [2020-07-21 16:02:30,962 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:30,962 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 29] total 33 [2020-07-21 16:02:30,962 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1342851484] [2020-07-21 16:02:30,963 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-21 16:02:30,964 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:30,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-21 16:02:30,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=887, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 16:02:30,965 INFO L87 Difference]: Start difference. First operand 91 states and 130 transitions. Second operand 33 states. [2020-07-21 16:02:32,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:32,716 INFO L93 Difference]: Finished difference Result 223 states and 422 transitions. [2020-07-21 16:02:32,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-07-21 16:02:32,717 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 368 [2020-07-21 16:02:32,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:32,721 INFO L225 Difference]: With dead ends: 223 [2020-07-21 16:02:32,721 INFO L226 Difference]: Without dead ends: 140 [2020-07-21 16:02:32,724 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 766 GetRequests, 679 SyntacticMatches, 25 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 916 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=963, Invalid=3069, Unknown=0, NotChecked=0, Total=4032 [2020-07-21 16:02:32,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2020-07-21 16:02:32,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 115. [2020-07-21 16:02:32,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2020-07-21 16:02:32,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 165 transitions. [2020-07-21 16:02:32,740 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 165 transitions. Word has length 368 [2020-07-21 16:02:32,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:32,741 INFO L479 AbstractCegarLoop]: Abstraction has 115 states and 165 transitions. [2020-07-21 16:02:32,741 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-21 16:02:32,741 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 165 transitions. [2020-07-21 16:02:32,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 396 [2020-07-21 16:02:32,745 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:32,745 INFO L422 BasicCegarLoop]: trace histogram [57, 57, 46, 28, 28, 28, 28, 28, 28, 28, 18, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:32,959 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:32,960 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:32,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:32,961 INFO L82 PathProgramCache]: Analyzing trace with hash 161946605, now seen corresponding path program 10 times [2020-07-21 16:02:32,962 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:32,962 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1024696782] [2020-07-21 16:02:32,963 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 16:02:33,231 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:02:33,232 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:33,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 593 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 16:02:33,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:33,592 INFO L134 CoverageAnalysis]: Checked inductivity of 8931 backedges. 1383 proven. 1865 refuted. 0 times theorem prover too weak. 5683 trivial. 0 not checked. [2020-07-21 16:02:33,593 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:35,445 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:35,640 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:35,642 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:35,774 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:35,775 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:35,868 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:35,869 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:38,017 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:38,018 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:38,536 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:38,845 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:38,846 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:39,043 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:39,044 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:39,155 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:39,157 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:39,227 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:39,359 INFO L134 CoverageAnalysis]: Checked inductivity of 8931 backedges. 1383 proven. 1948 refuted. 0 times theorem prover too weak. 5600 trivial. 0 not checked. [2020-07-21 16:02:39,360 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1024696782] [2020-07-21 16:02:39,360 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:39,360 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 27] total 29 [2020-07-21 16:02:39,360 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1911183166] [2020-07-21 16:02:39,361 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 16:02:39,361 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:39,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 16:02:39,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=666, Unknown=0, NotChecked=0, Total=812 [2020-07-21 16:02:39,363 INFO L87 Difference]: Start difference. First operand 115 states and 165 transitions. Second operand 29 states. [2020-07-21 16:02:40,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:40,453 INFO L93 Difference]: Finished difference Result 234 states and 351 transitions. [2020-07-21 16:02:40,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-07-21 16:02:40,458 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 395 [2020-07-21 16:02:40,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:40,465 INFO L225 Difference]: With dead ends: 234 [2020-07-21 16:02:40,465 INFO L226 Difference]: Without dead ends: 127 [2020-07-21 16:02:40,471 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 807 GetRequests, 737 SyntacticMatches, 25 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 489 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=560, Invalid=1602, Unknown=0, NotChecked=0, Total=2162 [2020-07-21 16:02:40,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2020-07-21 16:02:40,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 101. [2020-07-21 16:02:40,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-07-21 16:02:40,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 140 transitions. [2020-07-21 16:02:40,512 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 140 transitions. Word has length 395 [2020-07-21 16:02:40,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:40,517 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 140 transitions. [2020-07-21 16:02:40,517 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 16:02:40,517 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 140 transitions. [2020-07-21 16:02:40,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 464 [2020-07-21 16:02:40,524 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:40,524 INFO L422 BasicCegarLoop]: trace histogram [67, 67, 54, 33, 33, 33, 33, 33, 33, 33, 21, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:40,737 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:40,738 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:40,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:40,739 INFO L82 PathProgramCache]: Analyzing trace with hash -229001048, now seen corresponding path program 11 times [2020-07-21 16:02:40,740 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:40,740 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [608696878] [2020-07-21 16:02:40,740 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 16:02:41,161 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:02:41,162 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:41,167 INFO L263 TraceCheckSpWp]: Trace formula consists of 1029 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 16:02:41,193 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:41,554 INFO L134 CoverageAnalysis]: Checked inductivity of 12387 backedges. 480 proven. 2151 refuted. 0 times theorem prover too weak. 9756 trivial. 0 not checked. [2020-07-21 16:02:41,555 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:43,966 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:44,672 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:44,673 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:45,180 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:45,461 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:45,630 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:45,727 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:45,787 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:45,788 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:45,976 INFO L134 CoverageAnalysis]: Checked inductivity of 12387 backedges. 480 proven. 2228 refuted. 0 times theorem prover too weak. 9679 trivial. 0 not checked. [2020-07-21 16:02:45,977 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [608696878] [2020-07-21 16:02:45,977 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:45,978 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 20 [2020-07-21 16:02:45,978 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1679247142] [2020-07-21 16:02:45,979 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 16:02:45,980 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:45,980 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 16:02:45,980 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=271, Unknown=0, NotChecked=0, Total=380 [2020-07-21 16:02:45,981 INFO L87 Difference]: Start difference. First operand 101 states and 140 transitions. Second operand 20 states. [2020-07-21 16:02:46,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:46,359 INFO L93 Difference]: Finished difference Result 101 states and 140 transitions. [2020-07-21 16:02:46,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 16:02:46,360 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 463 [2020-07-21 16:02:46,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:46,361 INFO L225 Difference]: With dead ends: 101 [2020-07-21 16:02:46,361 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 16:02:46,363 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 933 GetRequests, 890 SyntacticMatches, 17 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 161 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=261, Invalid=495, Unknown=0, NotChecked=0, Total=756 [2020-07-21 16:02:46,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 16:02:46,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 16:02:46,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 16:02:46,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 16:02:46,364 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 463 [2020-07-21 16:02:46,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:46,364 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 16:02:46,365 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 16:02:46,365 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 16:02:46,365 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 16:02:46,566 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:46,570 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 16:02:46,908 WARN L193 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 38 [2020-07-21 16:02:47,778 WARN L193 SmtUtils]: Spent 495.00 ms on a formula simplification. DAG size of input: 100 DAG size of output: 38 [2020-07-21 16:02:47,953 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 84 DAG size of output: 8 [2020-07-21 16:02:47,960 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 16:02:47,960 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 16:02:47,960 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 16:02:47,960 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 16:02:47,960 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 16:02:47,960 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 16:02:47,961 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 27) no Hoare annotation was computed. [2020-07-21 16:02:47,961 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 23 30) the Hoare annotation is: true [2020-07-21 16:02:47,961 INFO L268 CegarLoopResult]: For program point L27(line 27) no Hoare annotation was computed. [2020-07-21 16:02:47,961 INFO L268 CegarLoopResult]: For program point L26(lines 26 28) no Hoare annotation was computed. [2020-07-21 16:02:47,961 INFO L264 CegarLoopResult]: At program point L25(line 25) the Hoare annotation is: (and (<= 7 main_~x~0) (<= main_~x~0 7)) [2020-07-21 16:02:47,961 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 23 30) no Hoare annotation was computed. [2020-07-21 16:02:47,961 INFO L268 CegarLoopResult]: For program point L25-1(line 25) no Hoare annotation was computed. [2020-07-21 16:02:47,962 INFO L268 CegarLoopResult]: For program point L26-2(lines 26 28) no Hoare annotation was computed. [2020-07-21 16:02:47,962 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 23 30) no Hoare annotation was computed. [2020-07-21 16:02:47,962 INFO L268 CegarLoopResult]: For program point fiboEXIT(lines 5 13) no Hoare annotation was computed. [2020-07-21 16:02:47,962 INFO L268 CegarLoopResult]: For program point fiboFINAL(lines 5 13) no Hoare annotation was computed. [2020-07-21 16:02:47,962 INFO L264 CegarLoopResult]: At program point L11(line 11) the Hoare annotation is: (and (<= fibo_~n |fibo_#in~n|) (<= |fibo_#in~n| fibo_~n) (<= 2 |fibo_#in~n|)) [2020-07-21 16:02:47,962 INFO L268 CegarLoopResult]: For program point L11-1(line 11) no Hoare annotation was computed. [2020-07-21 16:02:47,963 INFO L264 CegarLoopResult]: At program point L11-2(line 11) the Hoare annotation is: (and (not (<= |fibo_#in~n| 1)) (let ((.cse0 (<= fibo_~n |fibo_#in~n|)) (.cse1 (<= |fibo_#in~n| fibo_~n))) (or (and (<= |fibo_#in~n| 6) .cse0 .cse1 (= 5 |fibo_#t~ret0|) (<= 6 |fibo_#in~n|)) (and (<= 5 |fibo_#in~n|) .cse0 .cse1 (<= |fibo_#in~n| 5) (= |fibo_#t~ret0| 3)) (and .cse0 .cse1 (<= 8 |fibo_#in~n|)) (and (<= 4 |fibo_#in~n|) (= |fibo_#t~ret0| 2) .cse1 (<= fibo_~n 4)) (and (= |fibo_#t~ret0| 1) .cse0 .cse1 (<= |fibo_#in~n| 3)) (and .cse1 (<= fibo_~n 7) (<= 7 |fibo_#in~n|) (= |fibo_#t~ret0| 8))))) [2020-07-21 16:02:47,963 INFO L268 CegarLoopResult]: For program point L8(lines 8 12) no Hoare annotation was computed. [2020-07-21 16:02:47,963 INFO L268 CegarLoopResult]: For program point L11-3(line 11) no Hoare annotation was computed. [2020-07-21 16:02:47,963 INFO L268 CegarLoopResult]: For program point L6(lines 6 12) no Hoare annotation was computed. [2020-07-21 16:02:47,963 INFO L271 CegarLoopResult]: At program point fiboENTRY(lines 5 13) the Hoare annotation is: true [2020-07-21 16:02:47,973 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 04:02:47 BoogieIcfgContainer [2020-07-21 16:02:47,974 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 16:02:47,976 INFO L168 Benchmark]: Toolchain (without parser) took 48195.03 ms. Allocated memory was 145.2 MB in the beginning and 589.3 MB in the end (delta: 444.1 MB). Free memory was 103.4 MB in the beginning and 289.2 MB in the end (delta: -185.8 MB). Peak memory consumption was 258.3 MB. Max. memory is 7.1 GB. [2020-07-21 16:02:47,977 INFO L168 Benchmark]: CDTParser took 0.58 ms. Allocated memory is still 145.2 MB. Free memory is still 121.1 MB. There was no memory consumed. Max. memory is 7.1 GB. [2020-07-21 16:02:47,978 INFO L168 Benchmark]: CACSL2BoogieTranslator took 299.96 ms. Allocated memory is still 145.2 MB. Free memory was 103.0 MB in the beginning and 93.6 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-07-21 16:02:47,978 INFO L168 Benchmark]: Boogie Preprocessor took 44.71 ms. Allocated memory is still 145.2 MB. Free memory was 93.6 MB in the beginning and 92.4 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2020-07-21 16:02:47,979 INFO L168 Benchmark]: RCFGBuilder took 434.37 ms. Allocated memory was 145.2 MB in the beginning and 203.4 MB in the end (delta: 58.2 MB). Free memory was 92.4 MB in the beginning and 171.4 MB in the end (delta: -79.0 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. [2020-07-21 16:02:47,980 INFO L168 Benchmark]: TraceAbstraction took 47406.86 ms. Allocated memory was 203.4 MB in the beginning and 589.3 MB in the end (delta: 385.9 MB). Free memory was 170.4 MB in the beginning and 289.2 MB in the end (delta: -118.8 MB). Peak memory consumption was 267.1 MB. Max. memory is 7.1 GB. [2020-07-21 16:02:47,983 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.58 ms. Allocated memory is still 145.2 MB. Free memory is still 121.1 MB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 299.96 ms. Allocated memory is still 145.2 MB. Free memory was 103.0 MB in the beginning and 93.6 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 44.71 ms. Allocated memory is still 145.2 MB. Free memory was 93.6 MB in the beginning and 92.4 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 434.37 ms. Allocated memory was 145.2 MB in the beginning and 203.4 MB in the end (delta: 58.2 MB). Free memory was 92.4 MB in the beginning and 171.4 MB in the end (delta: -79.0 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 47406.86 ms. Allocated memory was 203.4 MB in the beginning and 589.3 MB in the end (delta: 385.9 MB). Free memory was 170.4 MB in the beginning and 289.2 MB in the end (delta: -118.8 MB). Peak memory consumption was 267.1 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 27]: 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 - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 24 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 45.8s, OverallIterations: 16, TraceHistogramMax: 67, AutomataDifference: 7.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 1.3s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 389 SDtfs, 1520 SDslu, 2180 SDs, 0 SdLazy, 2663 SolverSat, 1909 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 3.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 4905 GetRequests, 4378 SyntacticMatches, 171 SemanticMatches, 356 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2684 ImplicationChecksByTransitivity, 6.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=115occurred in iteration=14, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 16 MinimizatonAttempts, 113 StatesRemovedByMinimization, 11 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 8 LocationsWithAnnotation, 203 PreInvPairs, 279 NumberOfFragments, 109 HoareAnnotationTreeSize, 203 FomulaSimplifications, 2473 FormulaSimplificationTreeSizeReduction, 0.6s HoareSimplificationTime, 8 FomulaSimplificationsInter, 2362 FormulaSimplificationTreeSizeReductionInter, 0.6s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.2s SsaConstructionTime, 0.8s SatisfiabilityAnalysisTime, 32.6s InterpolantComputationTime, 2405 NumberOfCodeBlocks, 1867 NumberOfCodeBlocksAsserted, 28 NumberOfCheckSat, 4753 ConstructedInterpolants, 0 QuantifiedInterpolants, 2353391 SizeOfPredicates, 100 NumberOfNonLiveVariables, 4583 ConjunctsInSsa, 359 ConjunctsInUnsatCore, 30 InterpolantComputations, 2 PerfectInterpolantSequences, 59167/78630 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...