/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_15-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 13:03:08,915 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 13:03:08,918 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 13:03:08,936 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 13:03:08,937 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 13:03:08,939 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 13:03:08,941 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 13:03:08,950 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 13:03:08,952 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 13:03:08,953 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 13:03:08,954 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 13:03:08,955 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 13:03:08,955 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 13:03:08,962 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 13:03:08,963 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 13:03:08,964 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 13:03:08,964 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 13:03:08,965 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 13:03:08,969 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 13:03:08,972 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 13:03:08,974 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 13:03:08,975 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 13:03:08,977 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 13:03:08,978 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 13:03:08,983 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 13:03:09,000 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 13:03:09,000 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 13:03:09,002 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 13:03:09,003 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 13:03:09,025 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 13:03:09,026 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 13:03:09,027 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 13:03:09,028 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 13:03:09,028 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 13:03:09,028 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 13:03:09,029 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 13:03:09,029 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 13:03:09,029 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 13:03:09,029 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 13:03:09,030 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 13:03:09,031 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 13:03:09,031 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 13:03:09,031 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 13:03:09,031 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 13:03:09,032 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 13:03:09,032 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 13:03:09,032 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 13:03:09,032 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 13:03:09,033 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 13:03:09,033 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 13:03:09,033 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 13:03:09,033 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 13:03:09,033 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 13:03:09,034 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 13:03:09,034 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 13:03:09,034 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:03:09,034 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 13:03:09,034 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 13:03:09,035 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 13:03:09,358 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 13:03:09,372 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 13:03:09,375 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 13:03:09,377 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 13:03:09,377 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 13:03:09,378 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_15-1.c [2020-07-21 13:03:09,445 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f9101da5c/9d7a0900cffc4f1d8e454641e48a4a21/FLAGdf93c9b0a [2020-07-21 13:03:09,891 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 13:03:09,891 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_15-1.c [2020-07-21 13:03:09,897 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f9101da5c/9d7a0900cffc4f1d8e454641e48a4a21/FLAGdf93c9b0a [2020-07-21 13:03:10,279 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f9101da5c/9d7a0900cffc4f1d8e454641e48a4a21 [2020-07-21 13:03:10,290 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 13:03:10,293 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 13:03:10,294 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 13:03:10,294 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 13:03:10,298 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 13:03:10,299 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:03:10" (1/1) ... [2020-07-21 13:03:10,304 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6e9bc63f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:03:10, skipping insertion in model container [2020-07-21 13:03:10,304 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:03:10" (1/1) ... [2020-07-21 13:03:10,314 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 13:03:10,331 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 13:03:10,498 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 13:03:10,503 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 13:03:10,518 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 13:03:10,533 INFO L208 MainTranslator]: Completed translation [2020-07-21 13:03:10,534 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:03:10 WrapperNode [2020-07-21 13:03:10,534 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 13:03:10,535 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 13:03:10,535 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 13:03:10,535 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 13:03:10,547 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:03:10" (1/1) ... [2020-07-21 13:03:10,547 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:03:10" (1/1) ... [2020-07-21 13:03:10,552 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:03:10" (1/1) ... [2020-07-21 13:03:10,552 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:03:10" (1/1) ... [2020-07-21 13:03:10,555 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:03:10" (1/1) ... [2020-07-21 13:03:10,557 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:03:10" (1/1) ... [2020-07-21 13:03:10,558 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:03:10" (1/1) ... [2020-07-21 13:03:10,559 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 13:03:10,560 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 13:03:10,560 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 13:03:10,560 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 13:03:10,561 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:03:10" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 13:03:10,720 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 13:03:10,721 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 13:03:10,721 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-21 13:03:10,721 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 13:03:10,721 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 13:03:10,721 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 13:03:10,721 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-21 13:03:10,721 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 13:03:10,722 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 13:03:10,722 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 13:03:10,899 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 13:03:10,899 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 13:03:10,904 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:03:10 BoogieIcfgContainer [2020-07-21 13:03:10,904 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 13:03:10,906 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 13:03:10,906 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 13:03:10,915 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 13:03:10,915 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 01:03:10" (1/3) ... [2020-07-21 13:03:10,917 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1b68eb66 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:03:10, skipping insertion in model container [2020-07-21 13:03:10,917 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:03:10" (2/3) ... [2020-07-21 13:03:10,917 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1b68eb66 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:03:10, skipping insertion in model container [2020-07-21 13:03:10,917 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:03:10" (3/3) ... [2020-07-21 13:03:10,923 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_15-1.c [2020-07-21 13:03:10,942 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 13:03:10,977 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 13:03:11,003 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 13:03:11,052 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 13:03:11,052 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 13:03:11,053 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 13:03:11,053 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 13:03:11,053 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 13:03:11,053 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 13:03:11,053 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 13:03:11,054 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 13:03:11,073 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-21 13:03:11,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 13:03:11,080 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:03:11,080 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:03:11,081 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:03:11,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:03:11,087 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-21 13:03:11,095 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:03:11,096 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1684816467] [2020-07-21 13:03:11,096 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:03:11,170 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:03:11,171 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:03:11,177 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 13:03:11,183 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:03:11,267 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:03:11,267 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:03:11,269 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1684816467] [2020-07-21 13:03:11,269 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:03:11,270 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 13:03:11,271 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1936767343] [2020-07-21 13:03:11,276 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 13:03:11,276 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:03:11,290 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 13:03:11,292 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 13:03:11,294 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-21 13:03:11,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:03:11,401 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-21 13:03:11,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 13:03:11,405 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 13:03:11,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:03:11,416 INFO L225 Difference]: With dead ends: 35 [2020-07-21 13:03:11,416 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 13:03:11,420 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 13:03:11,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 13:03:11,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 13:03:11,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 13:03:11,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 13:03:11,470 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-21 13:03:11,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:03:11,471 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 13:03:11,471 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 13:03:11,471 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 13:03:11,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 13:03:11,473 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:03:11,473 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:03:11,689 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:03:11,690 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:03:11,690 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:03:11,691 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-21 13:03:11,692 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:03:11,692 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1277218759] [2020-07-21 13:03:11,693 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:03:11,722 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:03:11,722 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:03:11,723 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 13:03:11,725 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:03:11,761 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:03:11,761 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:03:11,762 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1277218759] [2020-07-21 13:03:11,762 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:03:11,763 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 13:03:11,763 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [817806824] [2020-07-21 13:03:11,766 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 13:03:11,767 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:03:11,767 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 13:03:11,768 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 13:03:11,768 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-21 13:03:11,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:03:11,837 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-21 13:03:11,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 13:03:11,838 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 13:03:11,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:03:11,839 INFO L225 Difference]: With dead ends: 27 [2020-07-21 13:03:11,839 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 13:03:11,841 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 13:03:11,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 13:03:11,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-21 13:03:11,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 13:03:11,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 13:03:11,849 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-21 13:03:11,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:03:11,850 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 13:03:11,850 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 13:03:11,850 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 13:03:11,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 13:03:11,851 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:03:11,852 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:03:12,064 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:03:12,065 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:03:12,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:03:12,066 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-21 13:03:12,066 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:03:12,067 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2075491779] [2020-07-21 13:03:12,067 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:03:12,110 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:03:12,111 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:03:12,112 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 13:03:12,116 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:03:12,180 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 13:03:12,181 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:03:12,409 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:12,463 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 13:03:12,464 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2075491779] [2020-07-21 13:03:12,464 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:03:12,465 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 13:03:12,465 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [214799542] [2020-07-21 13:03:12,466 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 13:03:12,466 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:03:12,467 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 13:03:12,467 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 13:03:12,467 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-21 13:03:12,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:03:12,607 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-21 13:03:12,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 13:03:12,608 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-21 13:03:12,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:03:12,611 INFO L225 Difference]: With dead ends: 32 [2020-07-21 13:03:12,612 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 13:03:12,613 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 13:03:12,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 13:03:12,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-21 13:03:12,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 13:03:12,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 13:03:12,632 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-21 13:03:12,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:03:12,633 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 13:03:12,633 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 13:03:12,633 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 13:03:12,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 13:03:12,637 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:03:12,637 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:03:12,850 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:03:12,851 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:03:12,851 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:03:12,851 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-21 13:03:12,852 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:03:12,852 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1805649739] [2020-07-21 13:03:12,852 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:03:12,895 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:03:12,896 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:03:12,897 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 13:03:12,899 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:03:12,948 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 13:03:12,949 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:03:13,083 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:13,114 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 13:03:13,114 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1805649739] [2020-07-21 13:03:13,114 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:03:13,115 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 13:03:13,115 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [405062385] [2020-07-21 13:03:13,116 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 13:03:13,116 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:03:13,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 13:03:13,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 13:03:13,117 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-21 13:03:13,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:03:13,215 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-21 13:03:13,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 13:03:13,216 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-21 13:03:13,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:03:13,218 INFO L225 Difference]: With dead ends: 37 [2020-07-21 13:03:13,218 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 13:03:13,219 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 13:03:13,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 13:03:13,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-21 13:03:13,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 13:03:13,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 13:03:13,228 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-21 13:03:13,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:03:13,229 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 13:03:13,229 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 13:03:13,229 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 13:03:13,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 13:03:13,231 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:03:13,231 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:03:13,433 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:03:13,433 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:03:13,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:03:13,434 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-21 13:03:13,435 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:03:13,435 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1136177034] [2020-07-21 13:03:13,435 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:03:13,469 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:03:13,469 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:03:13,474 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 13:03:13,477 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:03:13,520 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 13:03:13,521 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:03:13,742 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:13,744 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:13,801 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:13,803 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:13,860 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 13:03:13,861 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1136177034] [2020-07-21 13:03:13,861 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:03:13,862 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 13:03:13,863 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1127059257] [2020-07-21 13:03:13,863 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 13:03:13,863 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:03:13,864 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 13:03:13,865 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 13:03:13,865 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-21 13:03:14,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:03:14,002 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-21 13:03:14,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 13:03:14,003 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-21 13:03:14,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:03:14,006 INFO L225 Difference]: With dead ends: 42 [2020-07-21 13:03:14,006 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 13:03:14,007 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 64 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 13:03:14,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 13:03:14,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-21 13:03:14,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 13:03:14,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 13:03:14,019 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-21 13:03:14,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:03:14,020 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 13:03:14,020 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 13:03:14,020 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 13:03:14,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 13:03:14,022 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:03:14,022 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:03:14,224 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:03:14,225 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:03:14,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:03:14,226 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-21 13:03:14,226 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:03:14,227 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [130717737] [2020-07-21 13:03:14,227 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:03:14,261 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:03:14,261 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:03:14,262 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 13:03:14,264 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:03:14,300 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-21 13:03:14,301 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:03:14,540 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:14,594 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:14,596 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:14,626 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 13:03:14,627 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [130717737] [2020-07-21 13:03:14,627 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:03:14,627 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 13:03:14,627 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [762856451] [2020-07-21 13:03:14,628 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 13:03:14,628 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:03:14,628 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 13:03:14,629 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 13:03:14,629 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-21 13:03:14,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:03:14,757 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-21 13:03:14,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 13:03:14,758 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-21 13:03:14,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:03:14,763 INFO L225 Difference]: With dead ends: 47 [2020-07-21 13:03:14,763 INFO L226 Difference]: Without dead ends: 43 [2020-07-21 13:03:14,764 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 13:03:14,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-21 13:03:14,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-21 13:03:14,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 13:03:14,786 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 13:03:14,786 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-21 13:03:14,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:03:14,787 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 13:03:14,787 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 13:03:14,787 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 13:03:14,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-21 13:03:14,794 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:03:14,794 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:03:14,994 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:03:14,995 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:03:14,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:03:14,995 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-21 13:03:14,996 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:03:14,996 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1946604326] [2020-07-21 13:03:14,996 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:03:15,039 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:03:15,040 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:03:15,041 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 13:03:15,044 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:03:15,107 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 79 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-21 13:03:15,108 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:03:15,448 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:15,555 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:15,556 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:15,595 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:15,596 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:15,644 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-21 13:03:15,645 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1946604326] [2020-07-21 13:03:15,645 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:03:15,645 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 13:03:15,645 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1007485815] [2020-07-21 13:03:15,646 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 13:03:15,646 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:03:15,646 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 13:03:15,647 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 13:03:15,647 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-21 13:03:15,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:03:15,811 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-21 13:03:15,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 13:03:15,812 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-21 13:03:15,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:03:15,814 INFO L225 Difference]: With dead ends: 52 [2020-07-21 13:03:15,814 INFO L226 Difference]: Without dead ends: 48 [2020-07-21 13:03:15,815 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 111 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-21 13:03:15,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-21 13:03:15,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-21 13:03:15,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 13:03:15,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 13:03:15,826 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-21 13:03:15,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:03:15,826 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 13:03:15,826 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 13:03:15,827 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 13:03:15,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-21 13:03:15,829 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:03:15,829 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:03:16,034 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:03:16,035 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:03:16,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:03:16,036 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-21 13:03:16,036 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:03:16,037 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1829802089] [2020-07-21 13:03:16,037 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:03:16,093 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:03:16,093 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:03:16,094 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 13:03:16,098 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:03:16,148 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-07-21 13:03:16,148 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:03:16,554 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:16,646 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:16,647 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:16,696 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:16,746 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 181 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-07-21 13:03:16,746 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1829802089] [2020-07-21 13:03:16,747 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:03:16,747 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 13:03:16,747 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1187403761] [2020-07-21 13:03:16,748 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 13:03:16,748 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:03:16,748 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 13:03:16,749 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 13:03:16,749 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 13 states. [2020-07-21 13:03:16,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:03:16,890 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-21 13:03:16,891 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 13:03:16,891 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 96 [2020-07-21 13:03:16,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:03:16,894 INFO L225 Difference]: With dead ends: 57 [2020-07-21 13:03:16,894 INFO L226 Difference]: Without dead ends: 53 [2020-07-21 13:03:16,895 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 172 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-21 13:03:16,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-21 13:03:16,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-21 13:03:16,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 13:03:16,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 13:03:16,907 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-21 13:03:16,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:03:16,908 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 13:03:16,908 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 13:03:16,908 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 13:03:16,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-21 13:03:16,910 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:03:16,910 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:03:17,124 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:03:17,124 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:03:17,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:03:17,125 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-21 13:03:17,126 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:03:17,127 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [505356187] [2020-07-21 13:03:17,127 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:03:17,186 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:03:17,187 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:03:17,188 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 13:03:17,192 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:03:17,267 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 244 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2020-07-21 13:03:17,267 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:03:17,828 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:17,829 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:18,012 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:18,085 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:18,134 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:18,177 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 266 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-21 13:03:18,178 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [505356187] [2020-07-21 13:03:18,178 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:03:18,178 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 13:03:18,178 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1037118217] [2020-07-21 13:03:18,179 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 13:03:18,179 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:03:18,180 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 13:03:18,180 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 13:03:18,180 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 15 states. [2020-07-21 13:03:18,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:03:18,441 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-21 13:03:18,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 13:03:18,441 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 117 [2020-07-21 13:03:18,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:03:18,444 INFO L225 Difference]: With dead ends: 62 [2020-07-21 13:03:18,444 INFO L226 Difference]: Without dead ends: 58 [2020-07-21 13:03:18,445 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 211 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-21 13:03:18,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-21 13:03:18,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-21 13:03:18,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 13:03:18,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 13:03:18,458 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-21 13:03:18,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:03:18,458 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 13:03:18,458 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 13:03:18,459 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 13:03:18,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-21 13:03:18,461 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:03:18,461 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 21, 13, 13, 13, 13, 13, 13, 13, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:03:18,675 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:03:18,676 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:03:18,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:03:18,677 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-21 13:03:18,677 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:03:18,677 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1353083122] [2020-07-21 13:03:18,678 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:03:18,783 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:03:18,783 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:03:18,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 423 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 13:03:18,789 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:03:18,874 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 506 refuted. 0 times theorem prover too weak. 1334 trivial. 0 not checked. [2020-07-21 13:03:18,875 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:03:19,543 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:19,720 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:19,799 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:19,800 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:19,849 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:19,850 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:19,896 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 532 refuted. 0 times theorem prover too weak. 1308 trivial. 0 not checked. [2020-07-21 13:03:19,897 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1353083122] [2020-07-21 13:03:19,897 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:03:19,897 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 13:03:19,898 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1257963964] [2020-07-21 13:03:19,898 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 13:03:19,898 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:03:19,899 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 13:03:19,899 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 13:03:19,899 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 15 states. [2020-07-21 13:03:20,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:03:20,057 INFO L93 Difference]: Finished difference Result 67 states and 168 transitions. [2020-07-21 13:03:20,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 13:03:20,057 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 190 [2020-07-21 13:03:20,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:03:20,060 INFO L225 Difference]: With dead ends: 67 [2020-07-21 13:03:20,060 INFO L226 Difference]: Without dead ends: 63 [2020-07-21 13:03:20,061 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 356 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-21 13:03:20,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-21 13:03:20,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 41. [2020-07-21 13:03:20,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 13:03:20,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 13:03:20,073 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 190 [2020-07-21 13:03:20,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:03:20,074 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 13:03:20,074 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 13:03:20,074 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 13:03:20,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-21 13:03:20,078 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:03:20,078 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 22, 21, 21, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:03:20,286 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:03:20,287 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:03:20,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:03:20,288 INFO L82 PathProgramCache]: Analyzing trace with hash -1082984306, now seen corresponding path program 5 times [2020-07-21 13:03:20,289 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:03:20,289 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1341719476] [2020-07-21 13:03:20,289 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:03:20,427 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:03:20,428 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:03:20,430 INFO L263 TraceCheckSpWp]: Trace formula consists of 639 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 13:03:20,436 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:03:20,517 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 967 refuted. 0 times theorem prover too weak. 3536 trivial. 0 not checked. [2020-07-21 13:03:20,518 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:03:21,610 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:21,941 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:22,080 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:22,157 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:22,200 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:22,201 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:22,295 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 1002 refuted. 0 times theorem prover too weak. 3501 trivial. 0 not checked. [2020-07-21 13:03:22,295 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1341719476] [2020-07-21 13:03:22,296 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:03:22,296 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 13:03:22,296 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [344887203] [2020-07-21 13:03:22,297 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 13:03:22,298 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:03:22,298 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 13:03:22,298 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 13:03:22,298 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 17 states. [2020-07-21 13:03:22,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:03:22,499 INFO L93 Difference]: Finished difference Result 72 states and 194 transitions. [2020-07-21 13:03:22,500 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 13:03:22,500 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 286 [2020-07-21 13:03:22,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:03:22,503 INFO L225 Difference]: With dead ends: 72 [2020-07-21 13:03:22,503 INFO L226 Difference]: Without dead ends: 68 [2020-07-21 13:03:22,504 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 545 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-21 13:03:22,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-07-21 13:03:22,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-07-21 13:03:22,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 13:03:22,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-21 13:03:22,532 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 286 [2020-07-21 13:03:22,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:03:22,533 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-21 13:03:22,534 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 13:03:22,534 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-21 13:03:22,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2020-07-21 13:03:22,540 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:03:22,540 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 34, 21, 21, 21, 21, 21, 21, 21, 13, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:03:22,753 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:03:22,754 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:03:22,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:03:22,755 INFO L82 PathProgramCache]: Analyzing trace with hash 1006419304, now seen corresponding path program 5 times [2020-07-21 13:03:22,755 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:03:22,755 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [81055408] [2020-07-21 13:03:22,756 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:03:22,890 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:03:22,891 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:03:22,893 INFO L263 TraceCheckSpWp]: Trace formula consists of 665 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 13:03:22,898 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:03:23,018 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 159 proven. 1055 refuted. 0 times theorem prover too weak. 3799 trivial. 0 not checked. [2020-07-21 13:03:23,019 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:03:24,183 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:24,497 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:24,661 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:24,739 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:24,740 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:24,784 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:24,856 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 159 proven. 1095 refuted. 0 times theorem prover too weak. 3759 trivial. 0 not checked. [2020-07-21 13:03:24,857 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [81055408] [2020-07-21 13:03:24,857 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:03:24,857 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 13:03:24,857 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1610931667] [2020-07-21 13:03:24,858 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 13:03:24,858 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:03:24,859 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 13:03:24,859 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 13:03:24,859 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 17 states. [2020-07-21 13:03:25,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:03:25,071 INFO L93 Difference]: Finished difference Result 77 states and 222 transitions. [2020-07-21 13:03:25,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 13:03:25,072 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 299 [2020-07-21 13:03:25,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:03:25,079 INFO L225 Difference]: With dead ends: 77 [2020-07-21 13:03:25,079 INFO L226 Difference]: Without dead ends: 73 [2020-07-21 13:03:25,080 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 603 GetRequests, 570 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-21 13:03:25,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-21 13:03:25,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 46. [2020-07-21 13:03:25,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 13:03:25,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-21 13:03:25,102 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 299 [2020-07-21 13:03:25,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:03:25,103 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-21 13:03:25,103 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 13:03:25,103 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-21 13:03:25,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 508 [2020-07-21 13:03:25,118 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:03:25,119 INFO L422 BasicCegarLoop]: trace histogram [77, 77, 39, 38, 38, 38, 38, 38, 38, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:03:25,331 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:03:25,332 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:03:25,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:03:25,333 INFO L82 PathProgramCache]: Analyzing trace with hash 785285043, now seen corresponding path program 6 times [2020-07-21 13:03:25,333 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:03:25,334 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1872533532] [2020-07-21 13:03:25,334 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:03:25,548 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:03:25,549 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:03:25,551 INFO L263 TraceCheckSpWp]: Trace formula consists of 1132 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 13:03:25,558 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:03:25,749 INFO L134 CoverageAnalysis]: Checked inductivity of 15219 backedges. 391 proven. 2126 refuted. 0 times theorem prover too weak. 12702 trivial. 0 not checked. [2020-07-21 13:03:25,749 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:03:27,552 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:28,044 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:28,372 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:28,559 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:28,560 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:28,638 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:28,684 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:28,685 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:28,884 INFO L134 CoverageAnalysis]: Checked inductivity of 15219 backedges. 391 proven. 2177 refuted. 0 times theorem prover too weak. 12651 trivial. 0 not checked. [2020-07-21 13:03:28,884 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1872533532] [2020-07-21 13:03:28,884 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:03:28,884 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-21 13:03:28,885 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1840071526] [2020-07-21 13:03:28,885 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 13:03:28,886 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:03:28,886 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 13:03:28,886 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-21 13:03:28,886 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 19 states. [2020-07-21 13:03:29,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:03:29,306 INFO L93 Difference]: Finished difference Result 82 states and 252 transitions. [2020-07-21 13:03:29,306 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 13:03:29,306 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 507 [2020-07-21 13:03:29,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:03:29,312 INFO L225 Difference]: With dead ends: 82 [2020-07-21 13:03:29,312 INFO L226 Difference]: Without dead ends: 78 [2020-07-21 13:03:29,313 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1021 GetRequests, 983 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-21 13:03:29,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-21 13:03:29,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 51. [2020-07-21 13:03:29,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 13:03:29,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-21 13:03:29,325 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 507 [2020-07-21 13:03:29,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:03:29,326 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-21 13:03:29,326 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 13:03:29,326 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-21 13:03:29,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2020-07-21 13:03:29,329 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:03:29,330 INFO L422 BasicCegarLoop]: trace histogram [65, 65, 53, 32, 32, 32, 32, 32, 32, 32, 21, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:03:29,542 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:03:29,543 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:03:29,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:03:29,544 INFO L82 PathProgramCache]: Analyzing trace with hash -1350718391, now seen corresponding path program 6 times [2020-07-21 13:03:29,544 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:03:29,545 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [728266296] [2020-07-21 13:03:29,545 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:03:29,737 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:03:29,738 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:03:29,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 1000 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 13:03:29,748 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:03:29,931 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1918 refuted. 0 times theorem prover too weak. 9431 trivial. 0 not checked. [2020-07-21 13:03:29,932 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:03:31,607 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:32,172 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:32,172 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:32,502 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:32,503 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:32,645 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:32,730 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:32,730 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:32,775 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:32,882 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1975 refuted. 0 times theorem prover too weak. 9374 trivial. 0 not checked. [2020-07-21 13:03:32,882 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [728266296] [2020-07-21 13:03:32,883 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:03:32,883 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-21 13:03:32,883 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [392731025] [2020-07-21 13:03:32,884 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 13:03:32,884 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:03:32,884 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 13:03:32,885 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-21 13:03:32,885 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 19 states. [2020-07-21 13:03:33,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:03:33,147 INFO L93 Difference]: Finished difference Result 87 states and 284 transitions. [2020-07-21 13:03:33,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 13:03:33,147 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 450 [2020-07-21 13:03:33,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:03:33,150 INFO L225 Difference]: With dead ends: 87 [2020-07-21 13:03:33,150 INFO L226 Difference]: Without dead ends: 83 [2020-07-21 13:03:33,151 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 906 GetRequests, 868 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-21 13:03:33,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-07-21 13:03:33,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 51. [2020-07-21 13:03:33,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 13:03:33,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-21 13:03:33,175 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 450 [2020-07-21 13:03:33,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:03:33,176 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-21 13:03:33,176 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 13:03:33,176 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-21 13:03:33,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1067 [2020-07-21 13:03:33,187 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:03:33,188 INFO L422 BasicCegarLoop]: trace histogram [163, 163, 82, 81, 81, 81, 81, 81, 81, 81, 81, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:03:33,400 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:03:33,401 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:03:33,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:03:33,402 INFO L82 PathProgramCache]: Analyzing trace with hash 40336450, now seen corresponding path program 7 times [2020-07-21 13:03:33,402 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:03:33,402 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [211029758] [2020-07-21 13:03:33,403 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:03:33,836 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:03:33,836 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:03:33,840 INFO L263 TraceCheckSpWp]: Trace formula consists of 2379 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 13:03:33,855 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:03:34,454 INFO L134 CoverageAnalysis]: Checked inductivity of 69012 backedges. 797 proven. 5632 refuted. 0 times theorem prover too weak. 62583 trivial. 0 not checked. [2020-07-21 13:03:34,455 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:03:37,985 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:37,986 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:39,215 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:39,764 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:39,765 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:40,078 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:40,079 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:40,231 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:40,232 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:40,317 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:40,318 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:40,376 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:40,885 INFO L134 CoverageAnalysis]: Checked inductivity of 69012 backedges. 797 proven. 5702 refuted. 0 times theorem prover too weak. 62513 trivial. 0 not checked. [2020-07-21 13:03:40,886 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [211029758] [2020-07-21 13:03:40,886 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:03:40,887 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-21 13:03:40,887 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [258886414] [2020-07-21 13:03:40,888 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 13:03:40,889 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:03:40,889 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 13:03:40,889 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-21 13:03:40,890 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 21 states. [2020-07-21 13:03:41,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:03:41,434 INFO L93 Difference]: Finished difference Result 92 states and 318 transitions. [2020-07-21 13:03:41,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 13:03:41,435 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1066 [2020-07-21 13:03:41,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:03:41,441 INFO L225 Difference]: With dead ends: 92 [2020-07-21 13:03:41,441 INFO L226 Difference]: Without dead ends: 88 [2020-07-21 13:03:41,444 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2140 GetRequests, 2097 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-21 13:03:41,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-21 13:03:41,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 56. [2020-07-21 13:03:41,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 13:03:41,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-21 13:03:41,465 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 1066 [2020-07-21 13:03:41,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:03:41,468 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-21 13:03:41,468 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 13:03:41,468 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-21 13:03:41,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 821 [2020-07-21 13:03:41,476 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:03:41,476 INFO L422 BasicCegarLoop]: trace histogram [119, 119, 99, 59, 59, 59, 59, 59, 59, 59, 40, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:03:41,690 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:03:41,690 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:03:41,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:03:41,691 INFO L82 PathProgramCache]: Analyzing trace with hash 256338188, now seen corresponding path program 7 times [2020-07-21 13:03:41,692 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:03:41,692 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1793344319] [2020-07-21 13:03:41,693 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:03:42,051 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:03:42,051 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:03:42,054 INFO L263 TraceCheckSpWp]: Trace formula consists of 1821 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 13:03:42,066 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:03:42,419 INFO L134 CoverageAnalysis]: Checked inductivity of 39779 backedges. 582 proven. 4385 refuted. 0 times theorem prover too weak. 34812 trivial. 0 not checked. [2020-07-21 13:03:42,420 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:03:45,344 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:45,344 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:46,212 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:46,644 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:46,645 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:46,907 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:46,908 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:47,079 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:47,165 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:47,220 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:47,741 INFO L134 CoverageAnalysis]: Checked inductivity of 39779 backedges. 582 proven. 4462 refuted. 0 times theorem prover too weak. 34735 trivial. 0 not checked. [2020-07-21 13:03:47,751 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1793344319] [2020-07-21 13:03:47,751 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:03:47,752 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-21 13:03:47,754 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1978464678] [2020-07-21 13:03:47,755 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 13:03:47,755 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:03:47,756 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 13:03:47,756 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-21 13:03:47,756 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 21 states. [2020-07-21 13:03:48,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:03:48,322 INFO L93 Difference]: Finished difference Result 97 states and 354 transitions. [2020-07-21 13:03:48,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 13:03:48,322 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 820 [2020-07-21 13:03:48,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:03:48,326 INFO L225 Difference]: With dead ends: 97 [2020-07-21 13:03:48,326 INFO L226 Difference]: Without dead ends: 93 [2020-07-21 13:03:48,327 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1647 GetRequests, 1604 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-21 13:03:48,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-21 13:03:48,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 56. [2020-07-21 13:03:48,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 13:03:48,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-21 13:03:48,343 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 820 [2020-07-21 13:03:48,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:03:48,345 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-21 13:03:48,345 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 13:03:48,345 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-21 13:03:48,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1405 [2020-07-21 13:03:48,366 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:03:48,366 INFO L422 BasicCegarLoop]: trace histogram [215, 215, 108, 107, 107, 107, 107, 107, 107, 107, 107, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:03:48,579 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:03:48,580 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:03:48,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:03:48,581 INFO L82 PathProgramCache]: Analyzing trace with hash -60458800, now seen corresponding path program 8 times [2020-07-21 13:03:48,582 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:03:48,582 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [573862606] [2020-07-21 13:03:48,583 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 13:03:49,119 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:03:49,119 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:03:49,125 INFO L263 TraceCheckSpWp]: Trace formula consists of 3133 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 13:03:49,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:03:49,937 INFO L134 CoverageAnalysis]: Checked inductivity of 120375 backedges. 1323 proven. 8355 refuted. 0 times theorem prover too weak. 110697 trivial. 0 not checked. [2020-07-21 13:03:49,937 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:03:54,101 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:56,185 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:57,366 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:57,798 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:57,799 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:58,098 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:58,099 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:58,274 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:58,367 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:58,368 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:58,422 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:58,423 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:59,236 INFO L134 CoverageAnalysis]: Checked inductivity of 120375 backedges. 1323 proven. 8447 refuted. 0 times theorem prover too weak. 110605 trivial. 0 not checked. [2020-07-21 13:03:59,236 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [573862606] [2020-07-21 13:03:59,237 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:03:59,237 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-21 13:03:59,237 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1118642911] [2020-07-21 13:03:59,239 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 13:03:59,239 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:03:59,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 13:03:59,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 13:03:59,240 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 23 states. [2020-07-21 13:03:59,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:03:59,814 INFO L93 Difference]: Finished difference Result 102 states and 392 transitions. [2020-07-21 13:03:59,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 13:03:59,815 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1404 [2020-07-21 13:03:59,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:03:59,821 INFO L225 Difference]: With dead ends: 102 [2020-07-21 13:03:59,821 INFO L226 Difference]: Without dead ends: 98 [2020-07-21 13:03:59,822 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2817 GetRequests, 2769 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-21 13:03:59,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-21 13:03:59,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 61. [2020-07-21 13:03:59,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 13:03:59,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-21 13:03:59,837 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1404 [2020-07-21 13:03:59,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:03:59,840 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-21 13:03:59,840 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 13:03:59,840 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-21 13:03:59,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1616 [2020-07-21 13:03:59,862 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:03:59,863 INFO L422 BasicCegarLoop]: trace histogram [237, 237, 186, 118, 118, 118, 118, 118, 118, 118, 68, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:04:00,076 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:04:00,077 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:04:00,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:04:00,078 INFO L82 PathProgramCache]: Analyzing trace with hash 189714815, now seen corresponding path program 8 times [2020-07-21 13:04:00,078 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:04:00,078 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1068057668] [2020-07-21 13:04:00,079 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 13:04:00,699 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:04:00,700 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:04:00,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 3588 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 13:04:00,723 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:04:01,895 INFO L134 CoverageAnalysis]: Checked inductivity of 156681 backedges. 1441 proven. 9984 refuted. 0 times theorem prover too weak. 145256 trivial. 0 not checked. [2020-07-21 13:04:01,895 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:04:06,923 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:04:08,981 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:04:08,982 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:04:09,928 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:04:09,929 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:04:10,472 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:04:10,877 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:04:10,878 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:04:11,090 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:04:11,188 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:04:11,243 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:04:12,165 INFO L134 CoverageAnalysis]: Checked inductivity of 156681 backedges. 1441 proven. 10084 refuted. 0 times theorem prover too weak. 145156 trivial. 0 not checked. [2020-07-21 13:04:12,166 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1068057668] [2020-07-21 13:04:12,166 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:04:12,166 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-21 13:04:12,167 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [684363305] [2020-07-21 13:04:12,168 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 13:04:12,168 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:04:12,169 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 13:04:12,169 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 13:04:12,169 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 23 states. [2020-07-21 13:04:12,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:04:12,536 INFO L93 Difference]: Finished difference Result 107 states and 432 transitions. [2020-07-21 13:04:12,536 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 13:04:12,537 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1615 [2020-07-21 13:04:12,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:04:12,543 INFO L225 Difference]: With dead ends: 107 [2020-07-21 13:04:12,543 INFO L226 Difference]: Without dead ends: 103 [2020-07-21 13:04:12,544 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3238 GetRequests, 3190 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-21 13:04:12,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-21 13:04:12,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 61. [2020-07-21 13:04:12,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 13:04:12,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-21 13:04:12,558 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1615 [2020-07-21 13:04:12,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:04:12,560 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-21 13:04:12,560 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 13:04:12,560 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-21 13:04:12,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2289 [2020-07-21 13:04:12,598 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:04:12,599 INFO L422 BasicCegarLoop]: trace histogram [351, 351, 176, 175, 175, 175, 175, 175, 175, 175, 175, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:04:12,799 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:04:12,800 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:04:12,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:04:12,801 INFO L82 PathProgramCache]: Analyzing trace with hash 1856386198, now seen corresponding path program 9 times [2020-07-21 13:04:12,802 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:04:12,802 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2053859538] [2020-07-21 13:04:12,802 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 13:04:13,670 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:04:13,670 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:04:13,679 INFO L263 TraceCheckSpWp]: Trace formula consists of 5105 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 13:04:13,698 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:04:16,199 INFO L134 CoverageAnalysis]: Checked inductivity of 321825 backedges. 2222 proven. 15676 refuted. 0 times theorem prover too weak. 303927 trivial. 0 not checked. [2020-07-21 13:04:16,199 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:04:23,948 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:04:26,945 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:04:28,698 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:04:29,597 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:04:29,598 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:04:30,270 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:04:30,271 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:04:30,607 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:04:30,608 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:04:30,784 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:04:30,880 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:04:30,934 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:04:32,705 INFO L134 CoverageAnalysis]: Checked inductivity of 321825 backedges. 2222 proven. 15793 refuted. 0 times theorem prover too weak. 303810 trivial. 0 not checked. [2020-07-21 13:04:32,706 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2053859538] [2020-07-21 13:04:32,706 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:04:32,706 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-21 13:04:32,706 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [583993203] [2020-07-21 13:04:32,708 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 13:04:32,708 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:04:32,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 13:04:32,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-21 13:04:32,709 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 25 states. [2020-07-21 13:04:33,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:04:33,429 INFO L93 Difference]: Finished difference Result 112 states and 474 transitions. [2020-07-21 13:04:33,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 13:04:33,435 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2288 [2020-07-21 13:04:33,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:04:33,441 INFO L225 Difference]: With dead ends: 112 [2020-07-21 13:04:33,441 INFO L226 Difference]: Without dead ends: 108 [2020-07-21 13:04:33,442 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4586 GetRequests, 4533 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 13:04:33,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-21 13:04:33,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 66. [2020-07-21 13:04:33,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-21 13:04:33,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-21 13:04:33,458 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2288 [2020-07-21 13:04:33,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:04:33,460 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-21 13:04:33,460 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 13:04:33,460 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-21 13:04:33,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3682 [2020-07-21 13:04:33,543 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:04:33,544 INFO L422 BasicCegarLoop]: trace histogram [539, 539, 440, 269, 269, 269, 269, 269, 269, 269, 171, 99, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:04:33,744 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:04:33,745 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:04:33,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:04:33,747 INFO L82 PathProgramCache]: Analyzing trace with hash 635198080, now seen corresponding path program 9 times [2020-07-21 13:04:33,748 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:04:33,748 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1445420423] [2020-07-21 13:04:33,748 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 13:04:35,004 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:04:35,004 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:04:35,020 INFO L263 TraceCheckSpWp]: Trace formula consists of 8173 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 13:04:35,048 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:04:39,580 INFO L134 CoverageAnalysis]: Checked inductivity of 820728 backedges. 3588 proven. 26140 refuted. 0 times theorem prover too weak. 791000 trivial. 0 not checked. [2020-07-21 13:04:39,581 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:04:49,612 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:04:55,622 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:04:58,495 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:04:58,496 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:04:59,959 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:05:00,652 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:05:01,023 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:05:01,196 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:05:01,296 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:05:01,297 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:05:01,353 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:05:01,353 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:05:05,781 INFO L134 CoverageAnalysis]: Checked inductivity of 820728 backedges. 3588 proven. 26266 refuted. 0 times theorem prover too weak. 790874 trivial. 0 not checked. [2020-07-21 13:05:05,782 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1445420423] [2020-07-21 13:05:05,782 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:05:05,783 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-21 13:05:05,783 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1645412150] [2020-07-21 13:05:05,786 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 13:05:05,786 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:05:05,786 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 13:05:05,786 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-21 13:05:05,786 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 25 states. [2020-07-21 13:05:06,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:05:06,804 INFO L93 Difference]: Finished difference Result 117 states and 518 transitions. [2020-07-21 13:05:06,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 13:05:06,805 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 3681 [2020-07-21 13:05:06,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:05:06,812 INFO L225 Difference]: With dead ends: 117 [2020-07-21 13:05:06,812 INFO L226 Difference]: Without dead ends: 113 [2020-07-21 13:05:06,813 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7371 GetRequests, 7318 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 13:05:06,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2020-07-21 13:05:06,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 66. [2020-07-21 13:05:06,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-21 13:05:06,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-21 13:05:06,831 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 3681 [2020-07-21 13:05:06,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:05:06,833 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-21 13:05:06,833 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 13:05:06,834 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-21 13:05:06,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3498 [2020-07-21 13:05:06,933 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:05:06,936 INFO L422 BasicCegarLoop]: trace histogram [537, 537, 269, 268, 268, 268, 268, 268, 268, 268, 268, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:05:07,150 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:05:07,151 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:05:07,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:05:07,154 INFO L82 PathProgramCache]: Analyzing trace with hash -48592917, now seen corresponding path program 10 times [2020-07-21 13:05:07,154 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:05:07,154 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [244204364] [2020-07-21 13:05:07,155 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 13:05:08,462 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:05:08,463 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:05:08,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 7802 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 13:05:08,505 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:05:12,476 INFO L134 CoverageAnalysis]: Checked inductivity of 754554 backedges. 3717 proven. 26786 refuted. 0 times theorem prover too weak. 724051 trivial. 0 not checked. [2020-07-21 13:05:12,476 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:05:23,723 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:05:23,724 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:05:30,248 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:05:33,429 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:05:35,035 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:05:36,042 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:05:36,683 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:05:36,684 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:05:36,983 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:05:37,185 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:05:37,287 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:05:37,343 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:05:41,152 INFO L134 CoverageAnalysis]: Checked inductivity of 754554 backedges. 3717 proven. 26931 refuted. 0 times theorem prover too weak. 723906 trivial. 0 not checked. [2020-07-21 13:05:41,153 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [244204364] [2020-07-21 13:05:41,153 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:05:41,154 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-21 13:05:41,154 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [875084383] [2020-07-21 13:05:41,156 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 13:05:41,157 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:05:41,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 13:05:41,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-21 13:05:41,158 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 27 states. [2020-07-21 13:05:42,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:05:42,197 INFO L93 Difference]: Finished difference Result 122 states and 564 transitions. [2020-07-21 13:05:42,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 13:05:42,199 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 3497 [2020-07-21 13:05:42,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:05:42,206 INFO L225 Difference]: With dead ends: 122 [2020-07-21 13:05:42,206 INFO L226 Difference]: Without dead ends: 118 [2020-07-21 13:05:42,208 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7005 GetRequests, 6947 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 13:05:42,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-21 13:05:42,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 71. [2020-07-21 13:05:42,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-21 13:05:42,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-21 13:05:42,227 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 3497 [2020-07-21 13:05:42,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:05:42,230 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-21 13:05:42,230 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 13:05:42,230 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-21 13:05:42,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4168 [2020-07-21 13:05:42,381 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:05:42,383 INFO L422 BasicCegarLoop]: trace histogram [611, 611, 494, 305, 305, 305, 305, 305, 305, 305, 189, 117, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:05:42,597 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:05:42,598 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:05:42,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:05:42,600 INFO L82 PathProgramCache]: Analyzing trace with hash -1563767596, now seen corresponding path program 10 times [2020-07-21 13:05:42,600 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:05:42,600 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1548721385] [2020-07-21 13:05:42,601 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 13:05:44,150 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:05:44,150 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:05:44,168 INFO L263 TraceCheckSpWp]: Trace formula consists of 9253 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 13:05:44,195 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:05:50,042 INFO L134 CoverageAnalysis]: Checked inductivity of 1052631 backedges. 4245 proven. 32913 refuted. 0 times theorem prover too weak. 1015473 trivial. 0 not checked. [2020-07-21 13:05:50,043 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:06:03,281 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:06:11,180 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:06:11,181 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:06:14,926 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:06:14,927 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:06:16,598 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:06:16,599 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:06:17,908 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:06:17,909 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:06:18,570 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:06:18,571 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:06:18,887 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:06:19,103 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:06:19,103 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:06:19,210 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:06:19,211 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:06:19,268 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:06:24,689 INFO L134 CoverageAnalysis]: Checked inductivity of 1052631 backedges. 4245 proven. 33068 refuted. 0 times theorem prover too weak. 1015318 trivial. 0 not checked. [2020-07-21 13:06:24,690 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1548721385] [2020-07-21 13:06:24,690 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:06:24,691 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-21 13:06:24,691 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [395613836] [2020-07-21 13:06:24,694 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 13:06:24,694 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:06:24,694 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 13:06:24,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-21 13:06:24,694 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 27 states. [2020-07-21 13:06:26,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:06:26,089 INFO L93 Difference]: Finished difference Result 127 states and 612 transitions. [2020-07-21 13:06:26,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 13:06:26,092 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 4167 [2020-07-21 13:06:26,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:06:26,100 INFO L225 Difference]: With dead ends: 127 [2020-07-21 13:06:26,100 INFO L226 Difference]: Without dead ends: 123 [2020-07-21 13:06:26,103 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8344 GetRequests, 8286 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 13:06:26,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2020-07-21 13:06:26,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 71. [2020-07-21 13:06:26,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-21 13:06:26,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-21 13:06:26,126 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 4167 [2020-07-21 13:06:26,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:06:26,129 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-21 13:06:26,129 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 13:06:26,129 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-21 13:06:26,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7502 [2020-07-21 13:06:26,654 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:06:26,657 INFO L422 BasicCegarLoop]: trace histogram [1153, 1153, 577, 576, 576, 576, 576, 576, 576, 576, 576, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:06:26,857 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:06:26,858 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:06:26,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:06:26,861 INFO L82 PathProgramCache]: Analyzing trace with hash -431750129, now seen corresponding path program 11 times [2020-07-21 13:06:26,861 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:06:26,861 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [340169224] [2020-07-21 13:06:26,862 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 13:06:29,430 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:06:29,430 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:06:29,472 INFO L263 TraceCheckSpWp]: Trace formula consists of 16734 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 13:06:29,525 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:06:46,150 INFO L134 CoverageAnalysis]: Checked inductivity of 3484512 backedges. 7787 proven. 64661 refuted. 0 times theorem prover too weak. 3412064 trivial. 0 not checked. [2020-07-21 13:06:46,150 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:07:15,157 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:07:29,472 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:07:35,257 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:07:35,258 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:07:38,476 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:07:38,477 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:07:40,923 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:07:42,302 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:07:42,303 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:07:43,018 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:07:43,019 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:07:43,450 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:07:43,658 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:07:43,659 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:07:43,775 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:07:43,841 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:08:00,806 INFO L134 CoverageAnalysis]: Checked inductivity of 3484512 backedges. 7787 proven. 64837 refuted. 0 times theorem prover too weak. 3411888 trivial. 0 not checked. [2020-07-21 13:08:00,806 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [340169224] [2020-07-21 13:08:00,806 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:08:00,808 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-21 13:08:00,808 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1338163016] [2020-07-21 13:08:00,813 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 13:08:00,813 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:08:00,814 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 13:08:00,814 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-21 13:08:00,814 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 29 states. [2020-07-21 13:08:01,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:08:01,769 INFO L93 Difference]: Finished difference Result 132 states and 662 transitions. [2020-07-21 13:08:01,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 13:08:01,771 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 7501 [2020-07-21 13:08:01,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:08:01,781 INFO L225 Difference]: With dead ends: 132 [2020-07-21 13:08:01,781 INFO L226 Difference]: Without dead ends: 128 [2020-07-21 13:08:01,782 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15014 GetRequests, 14951 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 13:08:01,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-07-21 13:08:01,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 76. [2020-07-21 13:08:01,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 13:08:01,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-21 13:08:01,805 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 7501 [2020-07-21 13:08:01,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:08:01,810 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-21 13:08:01,810 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 13:08:01,811 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-21 13:08:02,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12253 [2020-07-21 13:08:02,704 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:08:02,708 INFO L422 BasicCegarLoop]: trace histogram [1799, 1799, 1451, 899, 899, 899, 899, 899, 899, 899, 552, 348, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:08:02,909 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:08:02,909 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:08:02,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:08:02,913 INFO L82 PathProgramCache]: Analyzing trace with hash 1025821388, now seen corresponding path program 11 times [2020-07-21 13:08:02,913 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:08:02,914 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [33872194] [2020-07-21 13:08:02,914 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 13:08:07,117 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:08:07,118 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:08:07,191 INFO L263 TraceCheckSpWp]: Trace formula consists of 27205 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 13:08:07,277 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:08:52,638 INFO L134 CoverageAnalysis]: Checked inductivity of 9135783 backedges. 10970 proven. 109999 refuted. 0 times theorem prover too weak. 9014814 trivial. 0 not checked. [2020-07-21 13:08:52,638 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:09:45,137 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:09:45,138 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:05,615 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:13,330 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:13,331 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:19,932 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:19,933 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:23,585 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:23,585 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:25,188 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:25,188 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:25,897 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:26,387 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:26,618 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:26,619 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:26,746 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:26,746 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:26,817 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:13,308 INFO L134 CoverageAnalysis]: Checked inductivity of 9135783 backedges. 10970 proven. 110186 refuted. 0 times theorem prover too weak. 9014627 trivial. 0 not checked. [2020-07-21 13:11:13,309 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [33872194] [2020-07-21 13:11:13,309 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:11:13,311 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-21 13:11:13,311 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [387998149] [2020-07-21 13:11:13,318 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 13:11:13,318 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:11:13,319 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 13:11:13,319 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-21 13:11:13,319 INFO L87 Difference]: Start difference. First operand 76 states and 234 transitions. Second operand 29 states. [2020-07-21 13:11:14,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:11:14,147 INFO L93 Difference]: Finished difference Result 137 states and 714 transitions. [2020-07-21 13:11:14,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 13:11:14,149 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 12252 [2020-07-21 13:11:14,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:11:14,163 INFO L225 Difference]: With dead ends: 137 [2020-07-21 13:11:14,164 INFO L226 Difference]: Without dead ends: 133 [2020-07-21 13:11:14,165 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24515 GetRequests, 24452 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 13:11:14,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-07-21 13:11:14,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 76. [2020-07-21 13:11:14,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 13:11:14,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-21 13:11:14,191 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 12252 [2020-07-21 13:11:14,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:11:14,197 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-21 13:11:14,197 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 13:11:14,197 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-21 13:11:15,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12221 [2020-07-21 13:11:15,399 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:11:15,403 INFO L422 BasicCegarLoop]: trace histogram [1879, 1879, 940, 939, 939, 939, 939, 939, 939, 939, 939, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:11:15,604 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:15,604 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:11:15,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:11:15,609 INFO L82 PathProgramCache]: Analyzing trace with hash -150125272, now seen corresponding path program 12 times [2020-07-21 13:11:15,609 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:11:15,609 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [710592056] [2020-07-21 13:11:15,610 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 13:11:20,013 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:11:20,014 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:11:20,103 INFO L263 TraceCheckSpWp]: Trace formula consists of 27261 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 13:11:20,208 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:12:07,707 INFO L134 CoverageAnalysis]: Checked inductivity of 9259479 backedges. 12883 proven. 115865 refuted. 0 times theorem prover too weak. 9130731 trivial. 0 not checked. [2020-07-21 13:12:07,708 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:12:39,776 WARN L193 SmtUtils]: Spent 1.16 s on a formula simplification that was a NOOP. DAG size: 1 [2020-07-21 13:13:09,442 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:39,170 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:39,171 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:49,979 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:49,980 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:59,601 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:04,334 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:06,753 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:07,839 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:08,637 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:08,638 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:09,037 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:09,280 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:09,425 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:09,508 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:53,102 INFO L134 CoverageAnalysis]: Checked inductivity of 9259479 backedges. 12883 proven. 116075 refuted. 0 times theorem prover too weak. 9130521 trivial. 0 not checked. [2020-07-21 13:14:53,102 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [710592056] [2020-07-21 13:14:53,103 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:14:53,105 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 29] total 31 [2020-07-21 13:14:53,105 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1408439152] [2020-07-21 13:14:53,109 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-21 13:14:53,109 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:14:53,109 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-21 13:14:53,110 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=688, Unknown=0, NotChecked=0, Total=930 [2020-07-21 13:14:53,110 INFO L87 Difference]: Start difference. First operand 76 states and 234 transitions. Second operand 31 states. [2020-07-21 13:14:55,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:14:55,082 INFO L93 Difference]: Finished difference Result 142 states and 768 transitions. [2020-07-21 13:14:55,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-21 13:14:55,084 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 12220 [2020-07-21 13:14:55,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:14:55,095 INFO L225 Difference]: With dead ends: 142 [2020-07-21 13:14:55,095 INFO L226 Difference]: Without dead ends: 138 [2020-07-21 13:14:55,097 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24453 GetRequests, 24385 SyntacticMatches, 26 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 494 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=619, Invalid=1273, Unknown=0, NotChecked=0, Total=1892 [2020-07-21 13:14:55,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2020-07-21 13:14:55,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 81. [2020-07-21 13:14:55,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-07-21 13:14:55,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 265 transitions. [2020-07-21 13:14:55,122 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 265 transitions. Word has length 12220 [2020-07-21 13:14:55,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:14:55,128 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 265 transitions. [2020-07-21 13:14:55,128 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-21 13:14:55,128 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 265 transitions. [2020-07-21 13:14:55,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12077 [2020-07-21 13:14:55,813 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:14:55,817 INFO L422 BasicCegarLoop]: trace histogram [1767, 1767, 1467, 883, 883, 883, 883, 883, 883, 883, 584, 300, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:14:56,024 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:14:56,025 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:14:56,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:14:56,029 INFO L82 PathProgramCache]: Analyzing trace with hash -604189428, now seen corresponding path program 12 times [2020-07-21 13:14:56,029 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:14:56,030 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [230525121] [2020-07-21 13:14:56,030 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:15:00,265 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:15:00,265 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:15:00,334 INFO L263 TraceCheckSpWp]: Trace formula consists of 26805 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 13:15:00,420 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:15:44,062 INFO L134 CoverageAnalysis]: Checked inductivity of 8873967 backedges. 10951 proven. 118519 refuted. 0 times theorem prover too weak. 8744497 trivial. 0 not checked. [2020-07-21 13:15:44,062 INFO L328 TraceCheckSpWp]: Computing backward predicates...