/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_4-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 16:51:47,629 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 16:51:47,632 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 16:51:47,659 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 16:51:47,659 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 16:51:47,662 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 16:51:47,665 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 16:51:47,667 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 16:51:47,669 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 16:51:47,671 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 16:51:47,672 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 16:51:47,674 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 16:51:47,674 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 16:51:47,676 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 16:51:47,677 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 16:51:47,679 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 16:51:47,680 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 16:51:47,681 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 16:51:47,684 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 16:51:47,686 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 16:51:47,688 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 16:51:47,690 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 16:51:47,691 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 16:51:47,693 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 16:51:47,696 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 16:51:47,706 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 16:51:47,707 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 16:51:47,708 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 16:51:47,709 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 16:51:47,727 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 16:51:47,728 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 16:51:47,729 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 16:51:47,730 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 16:51:47,730 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 16:51:47,730 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 16:51:47,731 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 16:51:47,731 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 16:51:47,731 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 16:51:47,731 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 16:51:47,731 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 16:51:47,731 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 16:51:47,732 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 16:51:47,732 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 16:51:47,732 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 16:51:47,732 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 16:51:47,732 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 16:51:47,733 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 16:51:47,733 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 16:51:47,733 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 16:51:47,733 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 16:51:47,734 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 16:51:47,734 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 16:51:47,734 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 16:51:47,734 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 16:51:47,735 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 16:51:47,735 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:51:47,735 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 16:51:47,735 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 16:51:47,735 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 16:51:48,040 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 16:51:48,053 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 16:51:48,056 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 16:51:48,058 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 16:51:48,058 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 16:51:48,059 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_4-1.c [2020-07-20 16:51:48,135 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1f6f16878/7b4009ca757f4a7c900fb2f9f658e854/FLAG73e0514b5 [2020-07-20 16:51:48,626 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 16:51:48,626 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_4-1.c [2020-07-20 16:51:48,634 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1f6f16878/7b4009ca757f4a7c900fb2f9f658e854/FLAG73e0514b5 [2020-07-20 16:51:48,997 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1f6f16878/7b4009ca757f4a7c900fb2f9f658e854 [2020-07-20 16:51:49,011 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 16:51:49,014 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 16:51:49,016 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 16:51:49,016 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 16:51:49,026 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 16:51:49,027 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:51:48" (1/1) ... [2020-07-20 16:51:49,031 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@16f72c6c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:51:49, skipping insertion in model container [2020-07-20 16:51:49,031 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:51:48" (1/1) ... [2020-07-20 16:51:49,040 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 16:51:49,065 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 16:51:49,271 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:51:49,276 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 16:51:49,291 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:51:49,304 INFO L208 MainTranslator]: Completed translation [2020-07-20 16:51:49,305 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:51:49 WrapperNode [2020-07-20 16:51:49,305 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 16:51:49,306 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 16:51:49,306 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 16:51:49,306 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 16:51:49,320 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:51:49" (1/1) ... [2020-07-20 16:51:49,321 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:51:49" (1/1) ... [2020-07-20 16:51:49,429 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:51:49" (1/1) ... [2020-07-20 16:51:49,429 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:51:49" (1/1) ... [2020-07-20 16:51:49,434 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:51:49" (1/1) ... [2020-07-20 16:51:49,446 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:51:49" (1/1) ... [2020-07-20 16:51:49,452 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:51:49" (1/1) ... [2020-07-20 16:51:49,454 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 16:51:49,455 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 16:51:49,455 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 16:51:49,456 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 16:51:49,457 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:51:49" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 16:51:49,537 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 16:51:49,537 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 16:51:49,537 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-20 16:51:49,538 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-20 16:51:49,538 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 16:51:49,538 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 16:51:49,538 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 16:51:49,539 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-20 16:51:49,539 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-20 16:51:49,539 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 16:51:49,539 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 16:51:49,539 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 16:51:49,791 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 16:51:49,791 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 16:51:49,798 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:51:49 BoogieIcfgContainer [2020-07-20 16:51:49,798 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 16:51:49,800 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 16:51:49,800 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 16:51:49,807 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 16:51:49,807 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 04:51:48" (1/3) ... [2020-07-20 16:51:49,810 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4d22e155 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:51:49, skipping insertion in model container [2020-07-20 16:51:49,811 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:51:49" (2/3) ... [2020-07-20 16:51:49,812 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4d22e155 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:51:49, skipping insertion in model container [2020-07-20 16:51:49,812 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:51:49" (3/3) ... [2020-07-20 16:51:49,814 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_4-1.c [2020-07-20 16:51:49,830 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 16:51:49,847 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 16:51:49,874 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 16:51:49,935 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 16:51:49,935 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 16:51:49,938 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 16:51:49,938 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 16:51:49,938 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 16:51:49,938 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 16:51:49,939 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 16:51:49,939 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 16:51:49,975 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-20 16:51:49,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 16:51:49,992 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:51:49,994 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:51:49,995 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:51:50,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:51:50,003 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-20 16:51:50,016 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:51:50,017 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [325597012] [2020-07-20 16:51:50,018 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:51:50,094 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:51:50,094 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:51:50,098 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 16:51:50,105 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:51:50,209 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 16:51:50,210 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:51:50,211 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [325597012] [2020-07-20 16:51:50,213 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:51:50,213 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 16:51:50,215 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [332195177] [2020-07-20 16:51:50,222 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 16:51:50,222 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:51:50,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 16:51:50,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 16:51:50,237 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-20 16:51:50,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:51:50,386 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-20 16:51:50,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 16:51:50,388 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 16:51:50,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:51:50,403 INFO L225 Difference]: With dead ends: 44 [2020-07-20 16:51:50,404 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 16:51:50,409 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 [2020-07-20 16:51:50,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 16:51:50,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-20 16:51:50,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 16:51:50,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 16:51:50,479 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-20 16:51:50,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:51:50,480 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 16:51:50,480 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 16:51:50,481 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 16:51:50,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 16:51:50,484 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:51:50,484 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:51:50,699 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:51:50,700 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:51:50,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:51:50,701 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-20 16:51:50,702 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:51:50,702 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [944196925] [2020-07-20 16:51:50,703 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:51:50,753 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:51:50,754 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:51:50,755 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 16:51:50,757 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:51:50,818 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 16:51:50,818 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:51:50,819 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [944196925] [2020-07-20 16:51:50,819 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:51:50,821 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 16:51:50,822 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [252620354] [2020-07-20 16:51:50,827 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 16:51:50,828 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:51:50,829 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 16:51:50,829 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 16:51:50,829 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-20 16:51:50,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:51:50,947 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-20 16:51:50,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 16:51:50,948 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 16:51:50,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:51:50,950 INFO L225 Difference]: With dead ends: 36 [2020-07-20 16:51:50,951 INFO L226 Difference]: Without dead ends: 32 [2020-07-20 16:51:50,952 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 [2020-07-20 16:51:50,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-20 16:51:50,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-20 16:51:50,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 16:51:50,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 16:51:50,964 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-20 16:51:50,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:51:50,964 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 16:51:50,965 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 16:51:50,965 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 16:51:50,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 16:51:50,967 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:51:50,967 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:51:51,181 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:51:51,182 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:51:51,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:51:51,183 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-20 16:51:51,184 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:51:51,184 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1381083831] [2020-07-20 16:51:51,185 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:51:51,235 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:51:51,235 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:51:51,237 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 16:51:51,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:51:51,348 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 16:51:51,349 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:51:51,611 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:51,619 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:51,673 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 16:51:51,673 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1381083831] [2020-07-20 16:51:51,674 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:51:51,674 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 16:51:51,675 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [364834990] [2020-07-20 16:51:51,675 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 16:51:51,676 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:51:51,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 16:51:51,677 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 16:51:51,677 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-20 16:51:51,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:51:51,842 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-20 16:51:51,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 16:51:51,843 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-20 16:51:51,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:51:51,845 INFO L225 Difference]: With dead ends: 41 [2020-07-20 16:51:51,846 INFO L226 Difference]: Without dead ends: 37 [2020-07-20 16:51:51,847 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 39 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:51:51,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-20 16:51:51,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-20 16:51:51,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 16:51:51,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 16:51:51,862 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-20 16:51:51,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:51:51,863 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 16:51:51,863 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 16:51:51,865 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 16:51:51,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 16:51:51,870 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:51:51,871 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:51:52,084 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:51:52,085 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:51:52,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:51:52,086 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-20 16:51:52,086 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:51:52,087 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [727111774] [2020-07-20 16:51:52,087 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:51:52,121 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:51:52,121 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:51:52,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 16:51:52,124 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:51:52,198 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 16:51:52,198 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:51:52,357 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:52,359 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:52,401 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 16:51:52,402 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [727111774] [2020-07-20 16:51:52,403 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:51:52,403 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 16:51:52,403 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [262788729] [2020-07-20 16:51:52,404 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 16:51:52,404 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:51:52,405 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 16:51:52,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 16:51:52,406 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-20 16:51:52,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:51:52,581 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-20 16:51:52,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 16:51:52,582 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-20 16:51:52,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:51:52,584 INFO L225 Difference]: With dead ends: 46 [2020-07-20 16:51:52,585 INFO L226 Difference]: Without dead ends: 42 [2020-07-20 16:51:52,585 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 42 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:51:52,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-20 16:51:52,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-20 16:51:52,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 16:51:52,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 16:51:52,597 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-20 16:51:52,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:51:52,597 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 16:51:52,598 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 16:51:52,598 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 16:51:52,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 16:51:52,600 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:51:52,600 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:51:52,814 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:51:52,815 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:51:52,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:51:52,816 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-20 16:51:52,816 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:51:52,817 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2002320747] [2020-07-20 16:51:52,817 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:51:52,858 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:51:52,859 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:51:52,860 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:51:52,863 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:51:52,925 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 16:51:52,925 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:51:53,182 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:53,255 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:53,257 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:53,329 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 16:51:53,330 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2002320747] [2020-07-20 16:51:53,331 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:51:53,331 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 16:51:53,331 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1397830686] [2020-07-20 16:51:53,332 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:51:53,332 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:51:53,333 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:51:53,333 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:51:53,333 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-20 16:51:53,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:51:53,538 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-20 16:51:53,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:51:53,539 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-20 16:51:53,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:51:53,541 INFO L225 Difference]: With dead ends: 51 [2020-07-20 16:51:53,541 INFO L226 Difference]: Without dead ends: 47 [2020-07-20 16:51:53,544 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 63 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-20 16:51:53,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-20 16:51:53,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-20 16:51:53,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-20 16:51:53,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-20 16:51:53,557 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-20 16:51:53,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:51:53,558 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-20 16:51:53,558 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:51:53,558 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-20 16:51:53,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-20 16:51:53,560 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:51:53,561 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:51:53,763 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:51:53,765 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:51:53,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:51:53,766 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-20 16:51:53,766 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:51:53,767 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [338266486] [2020-07-20 16:51:53,767 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:51:53,799 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:51:53,799 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:51:53,801 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:51:53,804 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:51:53,869 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 16:51:53,870 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:51:54,164 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:54,166 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:54,204 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 16:51:54,204 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [338266486] [2020-07-20 16:51:54,205 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:51:54,205 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-20 16:51:54,205 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [115540071] [2020-07-20 16:51:54,206 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:51:54,206 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:51:54,207 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:51:54,207 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:51:54,207 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 12 states. [2020-07-20 16:51:54,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:51:54,564 INFO L93 Difference]: Finished difference Result 84 states and 136 transitions. [2020-07-20 16:51:54,565 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:51:54,565 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-07-20 16:51:54,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:51:54,572 INFO L225 Difference]: With dead ends: 84 [2020-07-20 16:51:54,572 INFO L226 Difference]: Without dead ends: 50 [2020-07-20 16:51:54,579 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 64 SyntacticMatches, 7 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:51:54,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-07-20 16:51:54,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 47. [2020-07-20 16:51:54,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-07-20 16:51:54,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 67 transitions. [2020-07-20 16:51:54,608 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 67 transitions. Word has length 40 [2020-07-20 16:51:54,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:51:54,615 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 67 transitions. [2020-07-20 16:51:54,615 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:51:54,616 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 67 transitions. [2020-07-20 16:51:54,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-20 16:51:54,624 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:51:54,625 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:51:54,838 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:51:54,839 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:51:54,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:51:54,840 INFO L82 PathProgramCache]: Analyzing trace with hash 208191613, now seen corresponding path program 1 times [2020-07-20 16:51:54,840 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:51:54,840 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1809115754] [2020-07-20 16:51:54,841 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:51:54,918 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:51:54,918 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:51:54,920 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:51:54,926 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:51:54,980 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-20 16:51:54,981 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:51:55,215 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:55,262 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:55,309 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 16:51:55,310 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1809115754] [2020-07-20 16:51:55,310 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:51:55,310 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-20 16:51:55,311 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1171318858] [2020-07-20 16:51:55,311 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 16:51:55,311 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:51:55,312 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 16:51:55,312 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-07-20 16:51:55,312 INFO L87 Difference]: Start difference. First operand 47 states and 67 transitions. Second operand 11 states. [2020-07-20 16:51:55,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:51:55,487 INFO L93 Difference]: Finished difference Result 63 states and 99 transitions. [2020-07-20 16:51:55,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:51:55,488 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-20 16:51:55,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:51:55,491 INFO L225 Difference]: With dead ends: 63 [2020-07-20 16:51:55,491 INFO L226 Difference]: Without dead ends: 59 [2020-07-20 16:51:55,492 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 68 SyntacticMatches, 7 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2020-07-20 16:51:55,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-07-20 16:51:55,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 51. [2020-07-20 16:51:55,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-20 16:51:55,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 77 transitions. [2020-07-20 16:51:55,505 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 77 transitions. Word has length 41 [2020-07-20 16:51:55,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:51:55,506 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 77 transitions. [2020-07-20 16:51:55,506 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 16:51:55,506 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 77 transitions. [2020-07-20 16:51:55,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-07-20 16:51:55,509 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:51:55,510 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:51:55,722 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:51:55,724 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:51:55,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:51:55,724 INFO L82 PathProgramCache]: Analyzing trace with hash -1291563674, now seen corresponding path program 1 times [2020-07-20 16:51:55,725 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:51:55,725 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1808347545] [2020-07-20 16:51:55,726 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:51:55,766 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:51:55,766 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:51:55,770 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 16:51:55,772 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:51:55,819 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-20 16:51:55,820 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:51:55,939 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:55,982 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:56,032 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-20 16:51:56,033 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1808347545] [2020-07-20 16:51:56,034 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:51:56,034 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2020-07-20 16:51:56,035 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2140138535] [2020-07-20 16:51:56,035 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 16:51:56,036 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:51:56,036 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 16:51:56,036 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2020-07-20 16:51:56,036 INFO L87 Difference]: Start difference. First operand 51 states and 77 transitions. Second operand 9 states. [2020-07-20 16:51:56,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:51:56,161 INFO L93 Difference]: Finished difference Result 65 states and 105 transitions. [2020-07-20 16:51:56,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 16:51:56,161 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 53 [2020-07-20 16:51:56,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:51:56,164 INFO L225 Difference]: With dead ends: 65 [2020-07-20 16:51:56,164 INFO L226 Difference]: Without dead ends: 61 [2020-07-20 16:51:56,165 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 95 SyntacticMatches, 5 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2020-07-20 16:51:56,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-07-20 16:51:56,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 53. [2020-07-20 16:51:56,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-07-20 16:51:56,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 82 transitions. [2020-07-20 16:51:56,179 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 82 transitions. Word has length 53 [2020-07-20 16:51:56,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:51:56,180 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 82 transitions. [2020-07-20 16:51:56,180 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 16:51:56,180 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 82 transitions. [2020-07-20 16:51:56,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-07-20 16:51:56,184 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:51:56,184 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:51:56,398 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:51:56,399 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:51:56,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:51:56,399 INFO L82 PathProgramCache]: Analyzing trace with hash 736840020, now seen corresponding path program 2 times [2020-07-20 16:51:56,400 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:51:56,401 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [580403400] [2020-07-20 16:51:56,401 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:51:56,451 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:51:56,451 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:51:56,452 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:51:56,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:51:56,538 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 9 proven. 55 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-07-20 16:51:56,538 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:51:56,943 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:56,944 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:57,067 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:57,068 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:57,125 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:57,126 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:57,178 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 9 proven. 59 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2020-07-20 16:51:57,178 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [580403400] [2020-07-20 16:51:57,179 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:51:57,179 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 16:51:57,179 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1489053382] [2020-07-20 16:51:57,180 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 16:51:57,180 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:51:57,180 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 16:51:57,181 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 16:51:57,181 INFO L87 Difference]: Start difference. First operand 53 states and 82 transitions. Second operand 13 states. [2020-07-20 16:51:57,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:51:57,425 INFO L93 Difference]: Finished difference Result 75 states and 134 transitions. [2020-07-20 16:51:57,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:51:57,426 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 78 [2020-07-20 16:51:57,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:51:57,429 INFO L225 Difference]: With dead ends: 75 [2020-07-20 16:51:57,429 INFO L226 Difference]: Without dead ends: 71 [2020-07-20 16:51:57,430 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 137 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:51:57,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-07-20 16:51:57,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 56. [2020-07-20 16:51:57,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 16:51:57,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 90 transitions. [2020-07-20 16:51:57,445 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 90 transitions. Word has length 78 [2020-07-20 16:51:57,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:51:57,445 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 90 transitions. [2020-07-20 16:51:57,446 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 16:51:57,446 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 90 transitions. [2020-07-20 16:51:57,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-20 16:51:57,448 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:51:57,448 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:51:57,651 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:51:57,652 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:51:57,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:51:57,652 INFO L82 PathProgramCache]: Analyzing trace with hash 977113353, now seen corresponding path program 1 times [2020-07-20 16:51:57,653 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:51:57,654 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [226348767] [2020-07-20 16:51:57,654 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:51:57,698 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:51:57,698 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:51:57,699 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:51:57,702 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:51:57,770 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 54 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-20 16:51:57,770 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:51:58,143 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:58,144 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:58,187 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2020-07-20 16:51:58,187 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [226348767] [2020-07-20 16:51:58,188 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:51:58,188 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-20 16:51:58,188 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1490426624] [2020-07-20 16:51:58,191 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:51:58,192 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:51:58,192 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:51:58,193 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:51:58,193 INFO L87 Difference]: Start difference. First operand 56 states and 90 transitions. Second operand 12 states. [2020-07-20 16:51:58,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:51:58,430 INFO L93 Difference]: Finished difference Result 114 states and 219 transitions. [2020-07-20 16:51:58,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:51:58,431 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 67 [2020-07-20 16:51:58,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:51:58,432 INFO L225 Difference]: With dead ends: 114 [2020-07-20 16:51:58,433 INFO L226 Difference]: Without dead ends: 64 [2020-07-20 16:51:58,437 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 119 SyntacticMatches, 7 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:51:58,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-20 16:51:58,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 61. [2020-07-20 16:51:58,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 16:51:58,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 101 transitions. [2020-07-20 16:51:58,469 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 101 transitions. Word has length 67 [2020-07-20 16:51:58,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:51:58,470 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 101 transitions. [2020-07-20 16:51:58,470 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:51:58,470 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 101 transitions. [2020-07-20 16:51:58,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-20 16:51:58,474 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:51:58,475 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:51:58,675 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:51:58,677 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:51:58,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:51:58,677 INFO L82 PathProgramCache]: Analyzing trace with hash 643857677, now seen corresponding path program 2 times [2020-07-20 16:51:58,678 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:51:58,678 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [384761076] [2020-07-20 16:51:58,679 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:51:58,724 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:51:58,724 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:51:58,726 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:51:58,728 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:51:58,855 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 23 proven. 31 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2020-07-20 16:51:58,855 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:51:59,173 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:59,422 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:59,423 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:59,472 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:59,511 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 23 proven. 33 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2020-07-20 16:51:59,512 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [384761076] [2020-07-20 16:51:59,512 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:51:59,513 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-20 16:51:59,513 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [346124380] [2020-07-20 16:51:59,514 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 16:51:59,514 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:51:59,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 16:51:59,515 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:51:59,515 INFO L87 Difference]: Start difference. First operand 61 states and 101 transitions. Second operand 17 states. [2020-07-20 16:51:59,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:51:59,966 INFO L93 Difference]: Finished difference Result 131 states and 252 transitions. [2020-07-20 16:51:59,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 16:51:59,967 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 67 [2020-07-20 16:51:59,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:51:59,969 INFO L225 Difference]: With dead ends: 131 [2020-07-20 16:51:59,969 INFO L226 Difference]: Without dead ends: 76 [2020-07-20 16:51:59,971 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 113 SyntacticMatches, 11 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=124, Invalid=526, Unknown=0, NotChecked=0, Total=650 [2020-07-20 16:51:59,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-07-20 16:51:59,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 68. [2020-07-20 16:51:59,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-07-20 16:51:59,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 106 transitions. [2020-07-20 16:51:59,984 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 106 transitions. Word has length 67 [2020-07-20 16:51:59,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:51:59,985 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 106 transitions. [2020-07-20 16:51:59,985 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 16:51:59,985 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 106 transitions. [2020-07-20 16:51:59,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-20 16:51:59,987 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:51:59,988 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:52:00,202 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:00,204 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:52:00,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:52:00,204 INFO L82 PathProgramCache]: Analyzing trace with hash -1156896337, now seen corresponding path program 3 times [2020-07-20 16:52:00,205 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:52:00,205 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [896623362] [2020-07-20 16:52:00,205 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:00,280 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 16:52:00,281 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:52:00,283 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 39 conjunts are in the unsatisfiable core [2020-07-20 16:52:00,286 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:52:00,473 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2020-07-20 16:52:00,474 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:52:00,891 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2020-07-20 16:52:00,892 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [896623362] [2020-07-20 16:52:00,892 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:52:00,892 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 21 [2020-07-20 16:52:00,892 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1770512024] [2020-07-20 16:52:00,893 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 16:52:00,893 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:52:00,894 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 16:52:00,894 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=373, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:52:00,894 INFO L87 Difference]: Start difference. First operand 68 states and 106 transitions. Second operand 21 states. [2020-07-20 16:52:01,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:52:01,102 INFO L93 Difference]: Finished difference Result 118 states and 250 transitions. [2020-07-20 16:52:01,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-20 16:52:01,103 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 68 [2020-07-20 16:52:01,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:52:01,105 INFO L225 Difference]: With dead ends: 118 [2020-07-20 16:52:01,106 INFO L226 Difference]: Without dead ends: 114 [2020-07-20 16:52:01,106 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=51, Invalid=411, Unknown=0, NotChecked=0, Total=462 [2020-07-20 16:52:01,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2020-07-20 16:52:01,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 89. [2020-07-20 16:52:01,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-07-20 16:52:01,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 172 transitions. [2020-07-20 16:52:01,128 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 172 transitions. Word has length 68 [2020-07-20 16:52:01,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:52:01,129 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 172 transitions. [2020-07-20 16:52:01,129 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 16:52:01,129 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 172 transitions. [2020-07-20 16:52:01,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-07-20 16:52:01,132 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:52:01,132 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:52:01,344 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:01,345 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:52:01,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:52:01,346 INFO L82 PathProgramCache]: Analyzing trace with hash -1969207761, now seen corresponding path program 4 times [2020-07-20 16:52:01,347 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:52:01,347 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [718372406] [2020-07-20 16:52:01,348 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:01,411 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 16:52:01,411 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:52:01,413 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:52:01,415 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:52:01,528 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 42 proven. 70 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2020-07-20 16:52:01,528 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:52:01,894 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:01,896 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:01,948 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:02,144 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:02,203 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:02,204 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:02,241 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 42 proven. 72 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2020-07-20 16:52:02,242 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [718372406] [2020-07-20 16:52:02,242 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:52:02,242 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-20 16:52:02,243 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1556082236] [2020-07-20 16:52:02,243 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 16:52:02,244 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:52:02,244 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 16:52:02,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=229, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:52:02,245 INFO L87 Difference]: Start difference. First operand 89 states and 172 transitions. Second operand 17 states. [2020-07-20 16:52:02,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:52:02,764 INFO L93 Difference]: Finished difference Result 209 states and 466 transitions. [2020-07-20 16:52:02,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 16:52:02,765 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 94 [2020-07-20 16:52:02,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:52:02,768 INFO L225 Difference]: With dead ends: 209 [2020-07-20 16:52:02,768 INFO L226 Difference]: Without dead ends: 126 [2020-07-20 16:52:02,772 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 165 SyntacticMatches, 11 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=137, Invalid=565, Unknown=0, NotChecked=0, Total=702 [2020-07-20 16:52:02,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2020-07-20 16:52:02,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 123. [2020-07-20 16:52:02,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2020-07-20 16:52:02,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 206 transitions. [2020-07-20 16:52:02,802 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 206 transitions. Word has length 94 [2020-07-20 16:52:02,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:52:02,802 INFO L479 AbstractCegarLoop]: Abstraction has 123 states and 206 transitions. [2020-07-20 16:52:02,802 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 16:52:02,803 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 206 transitions. [2020-07-20 16:52:02,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-07-20 16:52:02,806 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:52:02,806 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:52:03,019 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:03,020 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:52:03,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:52:03,020 INFO L82 PathProgramCache]: Analyzing trace with hash -1711191765, now seen corresponding path program 2 times [2020-07-20 16:52:03,021 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:52:03,021 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1632158233] [2020-07-20 16:52:03,021 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:03,072 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 16:52:03,072 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:52:03,074 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 16:52:03,076 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:52:03,112 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 40 proven. 4 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-20 16:52:03,127 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:52:03,414 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 16 proven. 23 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2020-07-20 16:52:03,415 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1632158233] [2020-07-20 16:52:03,415 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:52:03,416 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2020-07-20 16:52:03,416 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2017947100] [2020-07-20 16:52:03,416 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 16:52:03,416 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:52:03,417 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 16:52:03,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2020-07-20 16:52:03,417 INFO L87 Difference]: Start difference. First operand 123 states and 206 transitions. Second operand 9 states. [2020-07-20 16:52:03,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:52:03,565 INFO L93 Difference]: Finished difference Result 236 states and 408 transitions. [2020-07-20 16:52:03,565 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:52:03,565 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 69 [2020-07-20 16:52:03,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:52:03,570 INFO L225 Difference]: With dead ends: 236 [2020-07-20 16:52:03,571 INFO L226 Difference]: Without dead ends: 118 [2020-07-20 16:52:03,574 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 127 SyntacticMatches, 5 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=52, Invalid=104, Unknown=0, NotChecked=0, Total=156 [2020-07-20 16:52:03,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-20 16:52:03,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 118. [2020-07-20 16:52:03,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2020-07-20 16:52:03,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 181 transitions. [2020-07-20 16:52:03,599 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 181 transitions. Word has length 69 [2020-07-20 16:52:03,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:52:03,600 INFO L479 AbstractCegarLoop]: Abstraction has 118 states and 181 transitions. [2020-07-20 16:52:03,600 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 16:52:03,600 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 181 transitions. [2020-07-20 16:52:03,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-07-20 16:52:03,603 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:52:03,603 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:52:03,817 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:03,818 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:52:03,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:52:03,819 INFO L82 PathProgramCache]: Analyzing trace with hash 1082273126, now seen corresponding path program 5 times [2020-07-20 16:52:03,819 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:52:03,819 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [438595240] [2020-07-20 16:52:03,820 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:03,926 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 16:52:03,926 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:52:03,929 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 16:52:03,936 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:52:04,075 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 29 proven. 54 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2020-07-20 16:52:04,075 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:52:04,537 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:04,538 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:04,841 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:04,895 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:04,935 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 29 proven. 56 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-20 16:52:04,935 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [438595240] [2020-07-20 16:52:04,936 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:52:04,936 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 19 [2020-07-20 16:52:04,936 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [909928563] [2020-07-20 16:52:04,937 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 16:52:04,937 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:52:04,937 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 16:52:04,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=290, Unknown=0, NotChecked=0, Total=342 [2020-07-20 16:52:04,938 INFO L87 Difference]: Start difference. First operand 118 states and 181 transitions. Second operand 19 states. [2020-07-20 16:52:05,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:52:05,621 INFO L93 Difference]: Finished difference Result 220 states and 354 transitions. [2020-07-20 16:52:05,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-20 16:52:05,622 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 80 [2020-07-20 16:52:05,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:52:05,625 INFO L225 Difference]: With dead ends: 220 [2020-07-20 16:52:05,625 INFO L226 Difference]: Without dead ends: 93 [2020-07-20 16:52:05,627 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 139 SyntacticMatches, 11 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=178, Invalid=752, Unknown=0, NotChecked=0, Total=930 [2020-07-20 16:52:05,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-20 16:52:05,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 90. [2020-07-20 16:52:05,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-07-20 16:52:05,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 124 transitions. [2020-07-20 16:52:05,637 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 124 transitions. Word has length 80 [2020-07-20 16:52:05,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:52:05,637 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 124 transitions. [2020-07-20 16:52:05,637 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 16:52:05,638 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 124 transitions. [2020-07-20 16:52:05,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-07-20 16:52:05,639 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:52:05,639 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:52:05,852 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:05,853 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:52:05,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:52:05,854 INFO L82 PathProgramCache]: Analyzing trace with hash -658368179, now seen corresponding path program 2 times [2020-07-20 16:52:05,854 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:52:05,855 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1347137484] [2020-07-20 16:52:05,855 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:05,921 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:52:05,922 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:52:05,923 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-20 16:52:05,926 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:52:06,015 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 117 proven. 11 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2020-07-20 16:52:06,015 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:52:06,530 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:06,605 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 39 proven. 54 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-20 16:52:06,605 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1347137484] [2020-07-20 16:52:06,606 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:52:06,606 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 14 [2020-07-20 16:52:06,606 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [415219012] [2020-07-20 16:52:06,607 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 16:52:06,607 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:52:06,607 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 16:52:06,608 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-07-20 16:52:06,608 INFO L87 Difference]: Start difference. First operand 90 states and 124 transitions. Second operand 14 states. [2020-07-20 16:52:06,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:52:06,831 INFO L93 Difference]: Finished difference Result 174 states and 246 transitions. [2020-07-20 16:52:06,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:52:06,831 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 92 [2020-07-20 16:52:06,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:52:06,834 INFO L225 Difference]: With dead ends: 174 [2020-07-20 16:52:06,834 INFO L226 Difference]: Without dead ends: 90 [2020-07-20 16:52:06,835 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 165 SyntacticMatches, 7 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=74, Invalid=268, Unknown=0, NotChecked=0, Total=342 [2020-07-20 16:52:06,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-07-20 16:52:06,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2020-07-20 16:52:06,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-07-20 16:52:06,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 123 transitions. [2020-07-20 16:52:06,844 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 123 transitions. Word has length 92 [2020-07-20 16:52:06,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:52:06,844 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 123 transitions. [2020-07-20 16:52:06,844 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 16:52:06,845 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 123 transitions. [2020-07-20 16:52:06,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2020-07-20 16:52:06,847 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:52:06,847 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 8, 8, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:52:07,062 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:07,062 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:52:07,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:52:07,063 INFO L82 PathProgramCache]: Analyzing trace with hash -1986613294, now seen corresponding path program 3 times [2020-07-20 16:52:07,063 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:52:07,064 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [755454110] [2020-07-20 16:52:07,064 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:07,135 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:52:07,135 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:52:07,136 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:52:07,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:52:07,250 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 222 proven. 90 refuted. 0 times theorem prover too weak. 109 trivial. 0 not checked. [2020-07-20 16:52:07,251 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:52:08,019 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:08,020 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:08,075 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:08,310 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:08,311 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:08,361 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:08,418 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 72 proven. 167 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2020-07-20 16:52:08,419 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [755454110] [2020-07-20 16:52:08,419 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:52:08,420 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 21 [2020-07-20 16:52:08,420 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [50274580] [2020-07-20 16:52:08,421 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 16:52:08,421 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:52:08,421 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 16:52:08,422 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:52:08,422 INFO L87 Difference]: Start difference. First operand 90 states and 123 transitions. Second operand 21 states. [2020-07-20 16:52:08,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:52:08,976 INFO L93 Difference]: Finished difference Result 209 states and 319 transitions. [2020-07-20 16:52:08,976 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-20 16:52:08,976 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 132 [2020-07-20 16:52:08,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:52:08,979 INFO L225 Difference]: With dead ends: 209 [2020-07-20 16:52:08,979 INFO L226 Difference]: Without dead ends: 125 [2020-07-20 16:52:08,980 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 234 SyntacticMatches, 11 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=187, Invalid=869, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 16:52:08,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2020-07-20 16:52:08,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 106. [2020-07-20 16:52:08,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2020-07-20 16:52:08,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 151 transitions. [2020-07-20 16:52:08,993 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 151 transitions. Word has length 132 [2020-07-20 16:52:08,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:52:08,993 INFO L479 AbstractCegarLoop]: Abstraction has 106 states and 151 transitions. [2020-07-20 16:52:08,993 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 16:52:08,993 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 151 transitions. [2020-07-20 16:52:08,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2020-07-20 16:52:08,995 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:52:08,995 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:52:09,209 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:09,209 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:52:09,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:52:09,210 INFO L82 PathProgramCache]: Analyzing trace with hash 1187422937, now seen corresponding path program 4 times [2020-07-20 16:52:09,210 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:52:09,211 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [87971936] [2020-07-20 16:52:09,211 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:09,286 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:52:09,287 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:52:09,288 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 16:52:09,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:52:09,324 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 62 proven. 4 refuted. 0 times theorem prover too weak. 115 trivial. 0 not checked. [2020-07-20 16:52:09,325 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:52:09,671 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 62 proven. 4 refuted. 0 times theorem prover too weak. 115 trivial. 0 not checked. [2020-07-20 16:52:09,673 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [87971936] [2020-07-20 16:52:09,674 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:52:09,674 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2020-07-20 16:52:09,677 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [386167026] [2020-07-20 16:52:09,678 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 16:52:09,678 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:52:09,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 16:52:09,679 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2020-07-20 16:52:09,679 INFO L87 Difference]: Start difference. First operand 106 states and 151 transitions. Second operand 9 states. [2020-07-20 16:52:09,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:52:09,813 INFO L93 Difference]: Finished difference Result 211 states and 312 transitions. [2020-07-20 16:52:09,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:52:09,814 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 93 [2020-07-20 16:52:09,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:52:09,817 INFO L225 Difference]: With dead ends: 211 [2020-07-20 16:52:09,817 INFO L226 Difference]: Without dead ends: 110 [2020-07-20 16:52:09,818 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 174 SyntacticMatches, 5 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=52, Invalid=104, Unknown=0, NotChecked=0, Total=156 [2020-07-20 16:52:09,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-07-20 16:52:09,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 106. [2020-07-20 16:52:09,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2020-07-20 16:52:09,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 150 transitions. [2020-07-20 16:52:09,828 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 150 transitions. Word has length 93 [2020-07-20 16:52:09,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:52:09,829 INFO L479 AbstractCegarLoop]: Abstraction has 106 states and 150 transitions. [2020-07-20 16:52:09,829 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 16:52:09,829 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 150 transitions. [2020-07-20 16:52:09,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-07-20 16:52:09,831 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:52:09,831 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:52:10,047 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:10,047 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:52:10,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:52:10,047 INFO L82 PathProgramCache]: Analyzing trace with hash 1257865878, now seen corresponding path program 6 times [2020-07-20 16:52:10,047 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:52:10,048 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [586527886] [2020-07-20 16:52:10,048 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:10,119 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:52:10,120 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:52:10,121 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:52:10,123 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:52:10,240 INFO L134 CoverageAnalysis]: Checked inductivity of 248 backedges. 65 proven. 94 refuted. 0 times theorem prover too weak. 89 trivial. 0 not checked. [2020-07-20 16:52:10,241 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:52:10,791 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:10,849 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:10,849 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:11,246 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:11,336 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:11,337 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:11,407 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:11,453 INFO L134 CoverageAnalysis]: Checked inductivity of 248 backedges. 65 proven. 100 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2020-07-20 16:52:11,454 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [586527886] [2020-07-20 16:52:11,454 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:52:11,454 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 21 [2020-07-20 16:52:11,454 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1907444351] [2020-07-20 16:52:11,455 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 16:52:11,455 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:52:11,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 16:52:11,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:52:11,456 INFO L87 Difference]: Start difference. First operand 106 states and 150 transitions. Second operand 21 states. [2020-07-20 16:52:12,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:52:12,168 INFO L93 Difference]: Finished difference Result 238 states and 370 transitions. [2020-07-20 16:52:12,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-20 16:52:12,168 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 106 [2020-07-20 16:52:12,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:52:12,171 INFO L225 Difference]: With dead ends: 238 [2020-07-20 16:52:12,171 INFO L226 Difference]: Without dead ends: 136 [2020-07-20 16:52:12,173 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 181 SyntacticMatches, 15 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 159 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=219, Invalid=971, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 16:52:12,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2020-07-20 16:52:12,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 121. [2020-07-20 16:52:12,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2020-07-20 16:52:12,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 173 transitions. [2020-07-20 16:52:12,184 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 173 transitions. Word has length 106 [2020-07-20 16:52:12,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:52:12,185 INFO L479 AbstractCegarLoop]: Abstraction has 121 states and 173 transitions. [2020-07-20 16:52:12,185 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 16:52:12,185 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 173 transitions. [2020-07-20 16:52:12,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-07-20 16:52:12,187 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:52:12,187 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 6, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:52:12,401 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:12,402 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:52:12,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:52:12,403 INFO L82 PathProgramCache]: Analyzing trace with hash -293061936, now seen corresponding path program 7 times [2020-07-20 16:52:12,403 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:52:12,404 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2085239451] [2020-07-20 16:52:12,404 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:12,481 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:52:12,481 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:52:12,483 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:52:12,485 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:52:12,581 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 165 proven. 31 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2020-07-20 16:52:12,582 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:52:13,129 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:13,428 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:13,497 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:13,498 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:13,557 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 50 proven. 100 refuted. 0 times theorem prover too weak. 107 trivial. 0 not checked. [2020-07-20 16:52:13,558 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2085239451] [2020-07-20 16:52:13,558 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:52:13,558 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-20 16:52:13,559 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1754221769] [2020-07-20 16:52:13,562 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 16:52:13,562 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:52:13,562 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 16:52:13,563 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:52:13,563 INFO L87 Difference]: Start difference. First operand 121 states and 173 transitions. Second operand 17 states. [2020-07-20 16:52:13,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:52:13,976 INFO L93 Difference]: Finished difference Result 240 states and 349 transitions. [2020-07-20 16:52:13,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 16:52:13,977 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 108 [2020-07-20 16:52:13,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:52:13,979 INFO L225 Difference]: With dead ends: 240 [2020-07-20 16:52:13,979 INFO L226 Difference]: Without dead ends: 125 [2020-07-20 16:52:13,980 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 189 SyntacticMatches, 11 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=124, Invalid=526, Unknown=0, NotChecked=0, Total=650 [2020-07-20 16:52:13,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2020-07-20 16:52:13,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 123. [2020-07-20 16:52:13,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2020-07-20 16:52:13,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 171 transitions. [2020-07-20 16:52:13,991 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 171 transitions. Word has length 108 [2020-07-20 16:52:13,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:52:13,991 INFO L479 AbstractCegarLoop]: Abstraction has 123 states and 171 transitions. [2020-07-20 16:52:13,991 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 16:52:13,991 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 171 transitions. [2020-07-20 16:52:13,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2020-07-20 16:52:13,993 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:52:13,993 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 8, 7, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:52:14,208 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:14,208 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:52:14,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:52:14,209 INFO L82 PathProgramCache]: Analyzing trace with hash 2011292190, now seen corresponding path program 8 times [2020-07-20 16:52:14,209 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:52:14,209 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [939905004] [2020-07-20 16:52:14,210 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:14,303 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:52:14,303 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:52:14,304 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 16:52:14,307 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:52:14,437 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 95 proven. 169 refuted. 0 times theorem prover too weak. 173 trivial. 0 not checked. [2020-07-20 16:52:14,437 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:52:15,245 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:15,332 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:15,333 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:15,389 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:15,767 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:15,856 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:15,857 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:15,908 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:15,959 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 95 proven. 179 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2020-07-20 16:52:15,960 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [939905004] [2020-07-20 16:52:15,960 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:52:15,960 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 23 [2020-07-20 16:52:15,960 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1703311634] [2020-07-20 16:52:15,961 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 16:52:15,961 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:52:15,961 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 16:52:15,962 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2020-07-20 16:52:15,962 INFO L87 Difference]: Start difference. First operand 123 states and 171 transitions. Second operand 23 states. [2020-07-20 16:52:16,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:52:16,971 INFO L93 Difference]: Finished difference Result 287 states and 447 transitions. [2020-07-20 16:52:16,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-20 16:52:16,974 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 136 [2020-07-20 16:52:16,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:52:16,977 INFO L225 Difference]: With dead ends: 287 [2020-07-20 16:52:16,977 INFO L226 Difference]: Without dead ends: 168 [2020-07-20 16:52:16,982 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 296 GetRequests, 241 SyntacticMatches, 17 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 247 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=276, Invalid=1284, Unknown=0, NotChecked=0, Total=1560 [2020-07-20 16:52:16,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2020-07-20 16:52:16,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 143. [2020-07-20 16:52:16,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 143 states. [2020-07-20 16:52:16,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 211 transitions. [2020-07-20 16:52:16,997 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 211 transitions. Word has length 136 [2020-07-20 16:52:16,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:52:16,998 INFO L479 AbstractCegarLoop]: Abstraction has 143 states and 211 transitions. [2020-07-20 16:52:16,998 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 16:52:16,998 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 211 transitions. [2020-07-20 16:52:17,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2020-07-20 16:52:17,001 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:52:17,001 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 5, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:52:17,215 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:17,216 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:52:17,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:52:17,216 INFO L82 PathProgramCache]: Analyzing trace with hash 180597192, now seen corresponding path program 9 times [2020-07-20 16:52:17,216 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:52:17,217 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [947869091] [2020-07-20 16:52:17,217 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:17,325 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:52:17,325 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:52:17,326 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:52:17,329 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:52:17,424 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 88 proven. 51 refuted. 0 times theorem prover too weak. 113 trivial. 0 not checked. [2020-07-20 16:52:17,425 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:52:17,757 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:17,758 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:18,047 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:18,048 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:18,096 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:18,149 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:18,193 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 88 proven. 53 refuted. 0 times theorem prover too weak. 111 trivial. 0 not checked. [2020-07-20 16:52:18,194 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [947869091] [2020-07-20 16:52:18,194 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:52:18,194 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-20 16:52:18,194 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [303373891] [2020-07-20 16:52:18,195 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 16:52:18,195 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:52:18,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 16:52:18,196 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:52:18,196 INFO L87 Difference]: Start difference. First operand 143 states and 211 transitions. Second operand 17 states. [2020-07-20 16:52:18,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:52:18,584 INFO L93 Difference]: Finished difference Result 285 states and 427 transitions. [2020-07-20 16:52:18,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 16:52:18,587 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 107 [2020-07-20 16:52:18,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:52:18,590 INFO L225 Difference]: With dead ends: 285 [2020-07-20 16:52:18,590 INFO L226 Difference]: Without dead ends: 148 [2020-07-20 16:52:18,592 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 188 SyntacticMatches, 11 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=124, Invalid=526, Unknown=0, NotChecked=0, Total=650 [2020-07-20 16:52:18,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2020-07-20 16:52:18,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 143. [2020-07-20 16:52:18,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 143 states. [2020-07-20 16:52:18,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 208 transitions. [2020-07-20 16:52:18,603 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 208 transitions. Word has length 107 [2020-07-20 16:52:18,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:52:18,603 INFO L479 AbstractCegarLoop]: Abstraction has 143 states and 208 transitions. [2020-07-20 16:52:18,604 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 16:52:18,604 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 208 transitions. [2020-07-20 16:52:18,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2020-07-20 16:52:18,607 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:52:18,607 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 13, 13, 9, 9, 8, 8, 8, 8, 8, 8, 8, 7, 6, 6, 6, 6, 6, 6, 6, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:52:18,821 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:18,822 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:52:18,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:52:18,823 INFO L82 PathProgramCache]: Analyzing trace with hash 1013698221, now seen corresponding path program 10 times [2020-07-20 16:52:18,823 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:52:18,823 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1452906428] [2020-07-20 16:52:18,824 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:18,972 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:52:18,972 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:52:18,974 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:52:18,978 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:52:19,119 INFO L134 CoverageAnalysis]: Checked inductivity of 1036 backedges. 200 proven. 234 refuted. 0 times theorem prover too weak. 602 trivial. 0 not checked. [2020-07-20 16:52:19,119 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:52:19,974 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:20,085 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:20,086 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:20,154 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:20,229 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:20,579 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:20,634 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:20,635 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:20,697 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:20,792 INFO L134 CoverageAnalysis]: Checked inductivity of 1036 backedges. 200 proven. 241 refuted. 0 times theorem prover too weak. 595 trivial. 0 not checked. [2020-07-20 16:52:20,793 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1452906428] [2020-07-20 16:52:20,793 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:52:20,793 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 23 [2020-07-20 16:52:20,794 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1585889189] [2020-07-20 16:52:20,794 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 16:52:20,794 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:52:20,795 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 16:52:20,795 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2020-07-20 16:52:20,795 INFO L87 Difference]: Start difference. First operand 143 states and 208 transitions. Second operand 23 states. [2020-07-20 16:52:22,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:52:22,004 INFO L93 Difference]: Finished difference Result 389 states and 655 transitions. [2020-07-20 16:52:22,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-20 16:52:22,005 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 199 [2020-07-20 16:52:22,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:52:22,013 INFO L225 Difference]: With dead ends: 389 [2020-07-20 16:52:22,013 INFO L226 Difference]: Without dead ends: 230 [2020-07-20 16:52:22,016 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 417 GetRequests, 364 SyntacticMatches, 13 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 259 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=287, Invalid=1435, Unknown=0, NotChecked=0, Total=1722 [2020-07-20 16:52:22,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230 states. [2020-07-20 16:52:22,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230 to 204. [2020-07-20 16:52:22,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 204 states. [2020-07-20 16:52:22,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 329 transitions. [2020-07-20 16:52:22,034 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 329 transitions. Word has length 199 [2020-07-20 16:52:22,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:52:22,034 INFO L479 AbstractCegarLoop]: Abstraction has 204 states and 329 transitions. [2020-07-20 16:52:22,034 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 16:52:22,034 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 329 transitions. [2020-07-20 16:52:22,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-07-20 16:52:22,036 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:52:22,037 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:52:22,252 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:22,253 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:52:22,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:52:22,253 INFO L82 PathProgramCache]: Analyzing trace with hash -923530611, now seen corresponding path program 5 times [2020-07-20 16:52:22,254 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:52:22,254 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1535007542] [2020-07-20 16:52:22,254 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:22,418 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:52:22,418 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:52:22,420 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 16:52:22,423 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:52:22,560 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 56 proven. 51 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2020-07-20 16:52:22,560 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:52:22,972 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:23,301 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:23,302 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:23,384 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:23,459 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 55 proven. 53 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2020-07-20 16:52:23,460 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1535007542] [2020-07-20 16:52:23,460 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:52:23,460 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 19 [2020-07-20 16:52:23,460 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [650000102] [2020-07-20 16:52:23,460 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 16:52:23,461 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:52:23,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 16:52:23,461 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=287, Unknown=0, NotChecked=0, Total=342 [2020-07-20 16:52:23,461 INFO L87 Difference]: Start difference. First operand 204 states and 329 transitions. Second operand 19 states. [2020-07-20 16:52:23,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:52:23,984 INFO L93 Difference]: Finished difference Result 405 states and 663 transitions. [2020-07-20 16:52:23,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 16:52:23,985 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 92 [2020-07-20 16:52:23,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:52:23,988 INFO L225 Difference]: With dead ends: 405 [2020-07-20 16:52:23,988 INFO L226 Difference]: Without dead ends: 207 [2020-07-20 16:52:23,990 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 160 SyntacticMatches, 11 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=168, Invalid=702, Unknown=0, NotChecked=0, Total=870 [2020-07-20 16:52:23,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2020-07-20 16:52:24,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 205. [2020-07-20 16:52:24,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 205 states. [2020-07-20 16:52:24,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 326 transitions. [2020-07-20 16:52:24,008 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 326 transitions. Word has length 92 [2020-07-20 16:52:24,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:52:24,009 INFO L479 AbstractCegarLoop]: Abstraction has 205 states and 326 transitions. [2020-07-20 16:52:24,009 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 16:52:24,009 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 326 transitions. [2020-07-20 16:52:24,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2020-07-20 16:52:24,012 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:52:24,012 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:52:24,226 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:24,227 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:52:24,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:52:24,228 INFO L82 PathProgramCache]: Analyzing trace with hash 767209796, now seen corresponding path program 3 times [2020-07-20 16:52:24,228 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:52:24,229 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [19720551] [2020-07-20 16:52:24,229 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:24,401 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:52:24,401 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:52:24,403 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 16:52:24,413 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:52:24,517 INFO L134 CoverageAnalysis]: Checked inductivity of 241 backedges. 35 proven. 73 refuted. 0 times theorem prover too weak. 133 trivial. 0 not checked. [2020-07-20 16:52:24,517 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:52:25,086 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:25,219 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:25,220 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:25,290 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:25,291 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:25,357 INFO L134 CoverageAnalysis]: Checked inductivity of 241 backedges. 34 proven. 78 refuted. 0 times theorem prover too weak. 129 trivial. 0 not checked. [2020-07-20 16:52:25,358 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [19720551] [2020-07-20 16:52:25,358 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:52:25,358 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12] total 15 [2020-07-20 16:52:25,358 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1628348906] [2020-07-20 16:52:25,359 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 16:52:25,359 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:52:25,359 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 16:52:25,359 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2020-07-20 16:52:25,359 INFO L87 Difference]: Start difference. First operand 205 states and 326 transitions. Second operand 15 states. [2020-07-20 16:52:25,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:52:25,669 INFO L93 Difference]: Finished difference Result 205 states and 326 transitions. [2020-07-20 16:52:25,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 16:52:25,669 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 104 [2020-07-20 16:52:25,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:52:25,670 INFO L225 Difference]: With dead ends: 205 [2020-07-20 16:52:25,670 INFO L226 Difference]: Without dead ends: 0 [2020-07-20 16:52:25,673 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 185 SyntacticMatches, 9 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=78, Invalid=264, Unknown=0, NotChecked=0, Total=342 [2020-07-20 16:52:25,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-20 16:52:25,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-20 16:52:25,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-20 16:52:25,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-20 16:52:25,674 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 104 [2020-07-20 16:52:25,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:52:25,674 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-20 16:52:25,674 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 16:52:25,674 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-20 16:52:25,674 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-20 16:52:25,883 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:25,887 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-20 16:52:27,709 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 9 [2020-07-20 16:52:28,230 WARN L193 SmtUtils]: Spent 428.00 ms on a formula simplification. DAG size of input: 89 DAG size of output: 17 [2020-07-20 16:52:28,409 WARN L193 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 7 [2020-07-20 16:52:28,776 WARN L193 SmtUtils]: Spent 357.00 ms on a formula simplification. DAG size of input: 97 DAG size of output: 23 [2020-07-20 16:52:28,780 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-20 16:52:28,781 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-20 16:52:28,781 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-20 16:52:28,781 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-20 16:52:28,781 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-20 16:52:28,781 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-20 16:52:28,781 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 39) no Hoare annotation was computed. [2020-07-20 16:52:28,781 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 35 42) the Hoare annotation is: true [2020-07-20 16:52:28,781 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 35 42) no Hoare annotation was computed. [2020-07-20 16:52:28,781 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 35 42) no Hoare annotation was computed. [2020-07-20 16:52:28,781 INFO L268 CegarLoopResult]: For program point L39(line 39) no Hoare annotation was computed. [2020-07-20 16:52:28,782 INFO L268 CegarLoopResult]: For program point L38(lines 38 40) no Hoare annotation was computed. [2020-07-20 16:52:28,782 INFO L264 CegarLoopResult]: At program point L37(line 37) the Hoare annotation is: (and (<= 4 main_~x~0) (<= main_~x~0 4)) [2020-07-20 16:52:28,782 INFO L268 CegarLoopResult]: For program point L37-1(line 37) no Hoare annotation was computed. [2020-07-20 16:52:28,782 INFO L268 CegarLoopResult]: For program point L38-2(lines 38 40) no Hoare annotation was computed. [2020-07-20 16:52:28,782 INFO L271 CegarLoopResult]: At program point fibo2ENTRY(lines 17 25) the Hoare annotation is: true [2020-07-20 16:52:28,782 INFO L264 CegarLoopResult]: At program point L23(line 23) the Hoare annotation is: (and (<= fibo2_~n |fibo2_#in~n|) (not (<= |fibo2_#in~n| 1)) (<= |fibo2_#in~n| fibo2_~n)) [2020-07-20 16:52:28,782 INFO L268 CegarLoopResult]: For program point L23-1(line 23) no Hoare annotation was computed. [2020-07-20 16:52:28,782 INFO L264 CegarLoopResult]: At program point L23-2(line 23) the Hoare annotation is: (and (<= fibo2_~n |fibo2_#in~n|) (or (and (<= |fibo2_#in~n| fibo2_~n) (<= 4 fibo2_~n)) (and (= 1 |fibo2_#t~ret2|) (<= |fibo2_#in~n| 3))) (<= 3 fibo2_~n)) [2020-07-20 16:52:28,782 INFO L268 CegarLoopResult]: For program point L20(lines 20 24) no Hoare annotation was computed. [2020-07-20 16:52:28,783 INFO L268 CegarLoopResult]: For program point L23-3(line 23) no Hoare annotation was computed. [2020-07-20 16:52:28,783 INFO L268 CegarLoopResult]: For program point L18(lines 18 24) no Hoare annotation was computed. [2020-07-20 16:52:28,783 INFO L268 CegarLoopResult]: For program point fibo2FINAL(lines 17 25) no Hoare annotation was computed. [2020-07-20 16:52:28,783 INFO L268 CegarLoopResult]: For program point fibo2EXIT(lines 17 25) no Hoare annotation was computed. [2020-07-20 16:52:28,783 INFO L271 CegarLoopResult]: At program point fibo1ENTRY(lines 7 15) the Hoare annotation is: true [2020-07-20 16:52:28,783 INFO L264 CegarLoopResult]: At program point L13(line 13) the Hoare annotation is: (and (<= 2 |fibo1_#in~n|) (<= fibo1_~n |fibo1_#in~n|) (<= |fibo1_#in~n| fibo1_~n)) [2020-07-20 16:52:28,783 INFO L268 CegarLoopResult]: For program point L13-1(line 13) no Hoare annotation was computed. [2020-07-20 16:52:28,783 INFO L264 CegarLoopResult]: At program point L13-2(line 13) the Hoare annotation is: (let ((.cse0 (<= fibo1_~n |fibo1_#in~n|)) (.cse1 (<= |fibo1_#in~n| fibo1_~n))) (or (and .cse0 (= 2 |fibo1_#t~ret0|) (<= 4 fibo1_~n) .cse1) (and .cse0 (<= 3 fibo1_~n) (<= |fibo1_#in~n| 3)) (and .cse0 (<= 5 fibo1_~n) .cse1) (and (<= 2 |fibo1_#in~n|) (<= fibo1_~n 2) (= 1 |fibo1_#t~ret0|) .cse1))) [2020-07-20 16:52:28,783 INFO L268 CegarLoopResult]: For program point fibo1FINAL(lines 7 15) no Hoare annotation was computed. [2020-07-20 16:52:28,784 INFO L268 CegarLoopResult]: For program point L10(lines 10 14) no Hoare annotation was computed. [2020-07-20 16:52:28,784 INFO L268 CegarLoopResult]: For program point L13-3(line 13) no Hoare annotation was computed. [2020-07-20 16:52:28,784 INFO L268 CegarLoopResult]: For program point L8(lines 8 14) no Hoare annotation was computed. [2020-07-20 16:52:28,784 INFO L268 CegarLoopResult]: For program point fibo1EXIT(lines 7 15) no Hoare annotation was computed. [2020-07-20 16:52:28,790 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 04:52:28 BoogieIcfgContainer [2020-07-20 16:52:28,790 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 16:52:28,792 INFO L168 Benchmark]: Toolchain (without parser) took 39779.52 ms. Allocated memory was 136.3 MB in the beginning and 474.5 MB in the end (delta: 338.2 MB). Free memory was 100.3 MB in the beginning and 299.2 MB in the end (delta: -199.0 MB). Peak memory consumption was 343.3 MB. Max. memory is 7.1 GB. [2020-07-20 16:52:28,793 INFO L168 Benchmark]: CDTParser took 0.27 ms. Allocated memory is still 136.3 MB. Free memory was 118.1 MB in the beginning and 117.9 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-20 16:52:28,793 INFO L168 Benchmark]: CACSL2BoogieTranslator took 289.61 ms. Allocated memory is still 136.3 MB. Free memory was 99.8 MB in the beginning and 90.5 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-07-20 16:52:28,794 INFO L168 Benchmark]: Boogie Preprocessor took 148.81 ms. Allocated memory was 136.3 MB in the beginning and 202.9 MB in the end (delta: 66.6 MB). Free memory was 90.3 MB in the beginning and 181.7 MB in the end (delta: -91.4 MB). Peak memory consumption was 14.4 MB. Max. memory is 7.1 GB. [2020-07-20 16:52:28,794 INFO L168 Benchmark]: RCFGBuilder took 343.41 ms. Allocated memory is still 202.9 MB. Free memory was 181.7 MB in the beginning and 168.3 MB in the end (delta: 13.3 MB). Peak memory consumption was 13.3 MB. Max. memory is 7.1 GB. [2020-07-20 16:52:28,794 INFO L168 Benchmark]: TraceAbstraction took 38990.11 ms. Allocated memory was 202.9 MB in the beginning and 474.5 MB in the end (delta: 271.6 MB). Free memory was 167.6 MB in the beginning and 299.2 MB in the end (delta: -131.6 MB). Peak memory consumption was 344.1 MB. Max. memory is 7.1 GB. [2020-07-20 16:52:28,796 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.27 ms. Allocated memory is still 136.3 MB. Free memory was 118.1 MB in the beginning and 117.9 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 289.61 ms. Allocated memory is still 136.3 MB. Free memory was 99.8 MB in the beginning and 90.5 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 148.81 ms. Allocated memory was 136.3 MB in the beginning and 202.9 MB in the end (delta: 66.6 MB). Free memory was 90.3 MB in the beginning and 181.7 MB in the end (delta: -91.4 MB). Peak memory consumption was 14.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 343.41 ms. Allocated memory is still 202.9 MB. Free memory was 181.7 MB in the beginning and 168.3 MB in the end (delta: 13.3 MB). Peak memory consumption was 13.3 MB. Max. memory is 7.1 GB. * TraceAbstraction took 38990.11 ms. Allocated memory was 202.9 MB in the beginning and 474.5 MB in the end (delta: 271.6 MB). Free memory was 167.6 MB in the beginning and 299.2 MB in the end (delta: -131.6 MB). Peak memory consumption was 344.1 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 39]: 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 5 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 35.9s, OverallIterations: 25, TraceHistogramMax: 16, AutomataDifference: 9.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 2.8s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 762 SDtfs, 1269 SDslu, 5025 SDs, 0 SdLazy, 5497 SolverSat, 1173 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 4.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 4063 GetRequests, 3387 SyntacticMatches, 197 SemanticMatches, 479 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1475 ImplicationChecksByTransitivity, 7.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=205occurred in iteration=24, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.4s AutomataMinimizationTime, 25 MinimizatonAttempts, 192 StatesRemovedByMinimization, 21 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 11 LocationsWithAnnotation, 989 PreInvPairs, 1779 NumberOfFragments, 103 HoareAnnotationTreeSize, 989 FomulaSimplifications, 37593 FormulaSimplificationTreeSizeReduction, 1.6s HoareSimplificationTime, 11 FomulaSimplificationsInter, 17416 FormulaSimplificationTreeSizeReductionInter, 1.1s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.6s SatisfiabilityAnalysisTime, 18.3s InterpolantComputationTime, 1945 NumberOfCodeBlocks, 1263 NumberOfCodeBlocksAsserted, 67 NumberOfCheckSat, 3815 ConstructedInterpolants, 0 QuantifiedInterpolants, 735393 SizeOfPredicates, 132 NumberOfNonLiveVariables, 3380 ConjunctsInSsa, 277 ConjunctsInUnsatCore, 48 InterpolantComputations, 2 PerfectInterpolantSequences, 6099/8556 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...