/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 DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_15-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 21:22:12,890 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 21:22:12,892 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 21:22:12,911 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-07-20 21:22:12,923 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 21:22:12,924 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 21:22:12,925 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 21:22:12,926 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 21:22:12,927 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 21:22:12,928 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 21:22:12,930 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 21:22:12,932 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 21:22:12,934 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 21:22:12,935 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 21:22:12,936 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 21:22:12,937 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 21:22:12,940 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 21:22:12,954 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 21:22:12,970 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 21:22:12,970 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 21:22:12,971 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 21:22:12,971 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 21:22:12,972 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 21:22:12,972 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 21:22:12,972 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 21:22:12,972 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 21:22:12,972 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 21:22:12,973 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 21:22:12,973 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 21:22:12,973 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 21:22:12,973 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 21:22:12,973 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 21:22:12,974 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 21:22:12,974 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 21:22:12,974 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 21:22:12,974 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 21:22:12,974 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 21:22:12,975 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 21:22:12,975 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 21:22:12,975 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 21:22:12,975 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 21:22:12,975 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 21:22:12,976 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 21:22:12,976 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 21:22:12,976 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:12,976 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 21:22:12,976 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 21:22:12,977 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 -> DAGSIZE Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 21:22:13,253 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 21:22:13,275 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 21:22:13,278 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 21:22:13,282 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 21:22:13,285 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 21:22:13,287 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_15-1.c [2020-07-20 21:22:13,367 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9ee9789e2/8279758079ee4f50a447c45d0d009f51/FLAG4692376b9 [2020-07-20 21:22:13,860 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 21:22:13,860 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_15-1.c [2020-07-20 21:22:13,868 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9ee9789e2/8279758079ee4f50a447c45d0d009f51/FLAG4692376b9 [2020-07-20 21:22:14,222 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9ee9789e2/8279758079ee4f50a447c45d0d009f51 [2020-07-20 21:22:14,231 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 21:22:14,234 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 21:22:14,235 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 21:22:14,235 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 21:22:14,240 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 21:22:14,241 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:22:14" (1/1) ... [2020-07-20 21:22:14,244 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4487fdd9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:14, skipping insertion in model container [2020-07-20 21:22:14,245 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:22:14" (1/1) ... [2020-07-20 21:22:14,254 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 21:22:14,272 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 21:22:14,430 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 21:22:14,435 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 21:22:14,452 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 21:22:14,466 INFO L208 MainTranslator]: Completed translation [2020-07-20 21:22:14,467 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:14 WrapperNode [2020-07-20 21:22:14,467 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 21:22:14,468 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 21:22:14,468 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 21:22:14,468 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 21:22:14,483 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:14" (1/1) ... [2020-07-20 21:22:14,484 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:14" (1/1) ... [2020-07-20 21:22:14,489 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:14" (1/1) ... [2020-07-20 21:22:14,490 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:14" (1/1) ... [2020-07-20 21:22:14,493 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:14" (1/1) ... [2020-07-20 21:22:14,496 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:14" (1/1) ... [2020-07-20 21:22:14,497 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:14" (1/1) ... [2020-07-20 21:22:14,498 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 21:22:14,499 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 21:22:14,499 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 21:22:14,499 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 21:22:14,500 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:14" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 21:22:14,644 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 21:22:14,644 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 21:22:14,644 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-20 21:22:14,644 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 21:22:14,644 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 21:22:14,645 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 21:22:14,645 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-20 21:22:14,645 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 21:22:14,645 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 21:22:14,645 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 21:22:14,823 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 21:22:14,824 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 21:22:14,828 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:22:14 BoogieIcfgContainer [2020-07-20 21:22:14,828 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 21:22:14,830 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 21:22:14,830 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 21:22:14,833 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 21:22:14,833 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 09:22:14" (1/3) ... [2020-07-20 21:22:14,834 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@35be8820 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:22:14, skipping insertion in model container [2020-07-20 21:22:14,835 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:14" (2/3) ... [2020-07-20 21:22:14,835 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@35be8820 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:22:14, skipping insertion in model container [2020-07-20 21:22:14,835 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:22:14" (3/3) ... [2020-07-20 21:22:14,837 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_15-1.c [2020-07-20 21:22:14,848 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 21:22:14,856 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 21:22:14,872 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 21:22:14,901 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 21:22:14,901 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 21:22:14,901 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 21:22:14,902 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 21:22:14,902 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 21:22:14,903 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 21:22:14,903 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 21:22:14,903 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 21:22:14,931 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-20 21:22:14,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 21:22:14,940 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:14,942 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:14,942 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:14,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:14,951 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-20 21:22:14,966 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:14,967 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1048457311] [2020-07-20 21:22:14,967 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:15,042 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:22:15,042 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:15,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 21:22:15,051 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:15,150 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:22:15,151 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:22:15,152 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1048457311] [2020-07-20 21:22:15,153 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:22:15,153 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 21:22:15,154 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [296980625] [2020-07-20 21:22:15,159 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 21:22:15,159 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:15,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 21:22:15,171 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 21:22:15,173 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-20 21:22:15,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:15,292 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-20 21:22:15,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 21:22:15,295 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 21:22:15,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:15,307 INFO L225 Difference]: With dead ends: 35 [2020-07-20 21:22:15,308 INFO L226 Difference]: Without dead ends: 21 [2020-07-20 21:22:15,311 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 21:22:15,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-20 21:22:15,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-20 21:22:15,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 21:22:15,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 21:22:15,365 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-20 21:22:15,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:15,365 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 21:22:15,365 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 21:22:15,366 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 21:22:15,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 21:22:15,368 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:15,368 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:15,582 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:15,583 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:15,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:15,584 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-20 21:22:15,585 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:15,585 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [616043849] [2020-07-20 21:22:15,586 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:15,616 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:22:15,617 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:15,617 INFO L263 TraceCheckSpWp]: Trace formula consists of 22 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 21:22:15,619 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:15,653 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:22:15,653 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:22:15,654 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [616043849] [2020-07-20 21:22:15,654 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:22:15,654 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 21:22:15,655 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1703326238] [2020-07-20 21:22:15,657 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 21:22:15,657 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:15,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 21:22:15,658 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 21:22:15,659 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-20 21:22:15,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:15,728 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-20 21:22:15,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 21:22:15,729 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 21:22:15,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:15,731 INFO L225 Difference]: With dead ends: 27 [2020-07-20 21:22:15,731 INFO L226 Difference]: Without dead ends: 23 [2020-07-20 21:22:15,733 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 21:22:15,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-20 21:22:15,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-20 21:22:15,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 21:22:15,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 21:22:15,742 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-20 21:22:15,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:15,742 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 21:22:15,742 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 21:22:15,743 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 21:22:15,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 21:22:15,744 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:15,745 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] [2020-07-20 21:22:15,959 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:15,959 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:15,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:15,962 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-20 21:22:15,962 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:15,963 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1885399857] [2020-07-20 21:22:15,963 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:15,995 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:22:15,996 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:15,997 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 21:22:15,999 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:16,043 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 21:22:16,043 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:16,223 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:16,272 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 21:22:16,273 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1885399857] [2020-07-20 21:22:16,273 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:16,273 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 21:22:16,274 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1696494742] [2020-07-20 21:22:16,274 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 21:22:16,275 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:16,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 21:22:16,276 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 21:22:16,276 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-20 21:22:16,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:16,392 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-20 21:22:16,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 21:22:16,393 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-20 21:22:16,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:16,395 INFO L225 Difference]: With dead ends: 32 [2020-07-20 21:22:16,396 INFO L226 Difference]: Without dead ends: 28 [2020-07-20 21:22:16,396 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 [2020-07-20 21:22:16,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-20 21:22:16,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-20 21:22:16,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 21:22:16,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-20 21:22:16,406 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-20 21:22:16,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:16,407 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-20 21:22:16,407 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 21:22:16,407 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-20 21:22:16,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 21:22:16,409 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:16,409 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] [2020-07-20 21:22:16,622 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:16,623 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:16,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:16,624 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-20 21:22:16,624 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:16,625 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [549261478] [2020-07-20 21:22:16,625 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:16,655 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:16,656 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:16,657 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 21:22:16,659 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:16,699 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 21:22:16,699 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:16,836 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:16,867 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 21:22:16,868 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [549261478] [2020-07-20 21:22:16,868 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:16,868 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 21:22:16,869 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [168531171] [2020-07-20 21:22:16,869 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 21:22:16,869 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:16,870 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 21:22:16,870 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 21:22:16,870 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-20 21:22:16,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:16,955 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-20 21:22:16,956 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 21:22:16,956 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-20 21:22:16,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:16,958 INFO L225 Difference]: With dead ends: 37 [2020-07-20 21:22:16,959 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 21:22:16,959 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-20 21:22:16,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 21:22:16,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-20 21:22:16,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 21:22:16,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-20 21:22:16,969 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-20 21:22:16,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:16,970 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-20 21:22:16,970 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 21:22:16,970 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-20 21:22:16,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 21:22:16,972 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:16,972 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] [2020-07-20 21:22:17,187 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:17,188 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:17,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:17,188 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-20 21:22:17,188 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:17,189 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [174639070] [2020-07-20 21:22:17,189 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:17,227 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:17,227 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:17,228 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 21:22:17,231 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:17,270 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-20 21:22:17,271 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:17,546 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:17,548 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:17,603 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:17,604 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:17,640 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-20 21:22:17,640 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [174639070] [2020-07-20 21:22:17,641 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:17,641 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 21:22:17,641 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1284672966] [2020-07-20 21:22:17,642 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 21:22:17,642 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:17,642 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 21:22:17,643 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 21:22:17,643 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-20 21:22:17,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:17,840 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-20 21:22:17,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 21:22:17,841 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-20 21:22:17,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:17,844 INFO L225 Difference]: With dead ends: 42 [2020-07-20 21:22:17,844 INFO L226 Difference]: Without dead ends: 38 [2020-07-20 21:22:17,845 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 [2020-07-20 21:22:17,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-20 21:22:17,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-20 21:22:17,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 21:22:17,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 21:22:17,855 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-20 21:22:17,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:17,856 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 21:22:17,856 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 21:22:17,856 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 21:22:17,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-20 21:22:17,858 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:17,859 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] [2020-07-20 21:22:18,062 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:18,064 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:18,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:18,064 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-20 21:22:18,065 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:18,065 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [608154784] [2020-07-20 21:22:18,066 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:18,098 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:18,099 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:18,100 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 21:22:18,102 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:18,163 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-20 21:22:18,164 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:18,396 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:18,454 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:18,456 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:18,495 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-20 21:22:18,496 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [608154784] [2020-07-20 21:22:18,496 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:18,496 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 21:22:18,496 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [550740505] [2020-07-20 21:22:18,497 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 21:22:18,497 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:18,497 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 21:22:18,498 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 21:22:18,498 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-20 21:22:18,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:18,653 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-20 21:22:18,653 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 21:22:18,653 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-20 21:22:18,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:18,656 INFO L225 Difference]: With dead ends: 47 [2020-07-20 21:22:18,657 INFO L226 Difference]: Without dead ends: 43 [2020-07-20 21:22:18,658 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 [2020-07-20 21:22:18,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-20 21:22:18,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-20 21:22:18,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 21:22:18,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 21:22:18,669 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-20 21:22:18,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:18,670 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 21:22:18,670 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 21:22:18,670 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 21:22:18,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-20 21:22:18,673 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:18,673 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] [2020-07-20 21:22:18,876 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:18,876 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:18,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:18,877 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-20 21:22:18,878 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:18,878 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2050960353] [2020-07-20 21:22:18,879 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:18,935 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:18,935 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:18,936 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:22:18,939 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:18,990 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 79 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-20 21:22:18,991 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:19,449 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:19,552 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:19,553 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:19,608 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:19,612 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:19,653 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-20 21:22:19,653 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2050960353] [2020-07-20 21:22:19,654 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:19,654 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 21:22:19,654 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1721038577] [2020-07-20 21:22:19,655 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 21:22:19,655 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:19,655 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 21:22:19,656 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 21:22:19,656 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-20 21:22:19,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:19,838 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-20 21:22:19,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 21:22:19,839 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-20 21:22:19,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:19,843 INFO L225 Difference]: With dead ends: 52 [2020-07-20 21:22:19,843 INFO L226 Difference]: Without dead ends: 48 [2020-07-20 21:22:19,848 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 [2020-07-20 21:22:19,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-20 21:22:19,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-20 21:22:19,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 21:22:19,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-20 21:22:19,875 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-20 21:22:19,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:19,876 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-20 21:22:19,876 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 21:22:19,878 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-20 21:22:19,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-20 21:22:19,886 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:19,887 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] [2020-07-20 21:22:20,099 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:20,100 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:20,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:20,100 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-20 21:22:20,100 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:20,101 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [750689620] [2020-07-20 21:22:20,101 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:20,164 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:20,164 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:20,165 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:22:20,169 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:20,247 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-07-20 21:22:20,248 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:20,665 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:20,775 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:20,778 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:20,820 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:20,863 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 181 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-07-20 21:22:20,863 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [750689620] [2020-07-20 21:22:20,863 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:20,864 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 21:22:20,864 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1752084789] [2020-07-20 21:22:20,868 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 21:22:20,868 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:20,868 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 21:22:20,869 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 21:22:20,869 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 13 states. [2020-07-20 21:22:21,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:21,017 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-20 21:22:21,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 21:22:21,019 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 96 [2020-07-20 21:22:21,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:21,023 INFO L225 Difference]: With dead ends: 57 [2020-07-20 21:22:21,023 INFO L226 Difference]: Without dead ends: 53 [2020-07-20 21:22:21,024 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 [2020-07-20 21:22:21,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-20 21:22:21,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-20 21:22:21,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 21:22:21,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-20 21:22:21,051 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-20 21:22:21,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:21,052 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-20 21:22:21,052 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 21:22:21,052 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-20 21:22:21,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-20 21:22:21,055 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:21,055 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] [2020-07-20 21:22:21,271 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:21,272 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:21,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:21,273 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-20 21:22:21,274 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:21,274 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1614060191] [2020-07-20 21:22:21,275 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:21,343 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:21,344 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:21,346 INFO L263 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 21:22:21,350 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:21,454 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 244 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2020-07-20 21:22:21,455 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:22,067 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:22,069 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:22,260 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:22,340 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:22,390 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:22,442 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 266 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-20 21:22:22,443 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1614060191] [2020-07-20 21:22:22,443 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:22,443 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-20 21:22:22,444 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [536010291] [2020-07-20 21:22:22,444 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 21:22:22,444 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:22,445 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 21:22:22,445 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-20 21:22:22,445 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 15 states. [2020-07-20 21:22:22,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:22,736 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-20 21:22:22,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:22:22,737 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 117 [2020-07-20 21:22:22,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:22,739 INFO L225 Difference]: With dead ends: 62 [2020-07-20 21:22:22,739 INFO L226 Difference]: Without dead ends: 58 [2020-07-20 21:22:22,740 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 [2020-07-20 21:22:22,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-20 21:22:22,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-20 21:22:22,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-20 21:22:22,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-20 21:22:22,753 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-20 21:22:22,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:22,753 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-20 21:22:22,753 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 21:22:22,753 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-20 21:22:22,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-20 21:22:22,756 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:22,756 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] [2020-07-20 21:22:22,971 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:22,972 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:22,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:22,972 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-20 21:22:22,973 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:22,973 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [996753456] [2020-07-20 21:22:22,973 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:23,058 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:23,058 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:23,059 INFO L263 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 21:22:23,064 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:23,148 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 506 refuted. 0 times theorem prover too weak. 1334 trivial. 0 not checked. [2020-07-20 21:22:23,148 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:23,882 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:24,083 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:24,170 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:24,171 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:24,218 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:24,219 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:24,275 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 532 refuted. 0 times theorem prover too weak. 1308 trivial. 0 not checked. [2020-07-20 21:22:24,276 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [996753456] [2020-07-20 21:22:24,276 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:24,276 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-20 21:22:24,276 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [946277076] [2020-07-20 21:22:24,277 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 21:22:24,277 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:24,278 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 21:22:24,278 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-20 21:22:24,278 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 15 states. [2020-07-20 21:22:24,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:24,467 INFO L93 Difference]: Finished difference Result 67 states and 168 transitions. [2020-07-20 21:22:24,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:22:24,468 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 190 [2020-07-20 21:22:24,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:24,471 INFO L225 Difference]: With dead ends: 67 [2020-07-20 21:22:24,471 INFO L226 Difference]: Without dead ends: 63 [2020-07-20 21:22:24,472 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 356 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-20 21:22:24,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-20 21:22:24,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 41. [2020-07-20 21:22:24,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-20 21:22:24,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-20 21:22:24,502 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 190 [2020-07-20 21:22:24,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:24,503 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-20 21:22:24,503 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 21:22:24,503 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-20 21:22:24,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-20 21:22:24,510 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:24,511 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] [2020-07-20 21:22:24,723 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:24,724 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:24,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:24,725 INFO L82 PathProgramCache]: Analyzing trace with hash -1082984306, now seen corresponding path program 5 times [2020-07-20 21:22:24,726 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:24,726 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [505450288] [2020-07-20 21:22:24,726 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:24,848 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:24,848 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:24,850 INFO L263 TraceCheckSpWp]: Trace formula consists of 543 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 21:22:24,855 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:24,964 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 967 refuted. 0 times theorem prover too weak. 3536 trivial. 0 not checked. [2020-07-20 21:22:24,964 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:26,200 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:26,534 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:26,699 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:26,787 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:26,837 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:26,838 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:26,937 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 1002 refuted. 0 times theorem prover too weak. 3501 trivial. 0 not checked. [2020-07-20 21:22:26,938 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [505450288] [2020-07-20 21:22:26,938 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:26,938 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-20 21:22:26,939 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [131168236] [2020-07-20 21:22:26,940 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 21:22:26,940 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:26,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 21:22:26,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:22:26,941 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 17 states. [2020-07-20 21:22:27,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:27,158 INFO L93 Difference]: Finished difference Result 72 states and 194 transitions. [2020-07-20 21:22:27,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 21:22:27,159 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 286 [2020-07-20 21:22:27,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:27,162 INFO L225 Difference]: With dead ends: 72 [2020-07-20 21:22:27,162 INFO L226 Difference]: Without dead ends: 68 [2020-07-20 21:22:27,163 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 [2020-07-20 21:22:27,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-07-20 21:22:27,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-07-20 21:22:27,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 21:22:27,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-20 21:22:27,181 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 286 [2020-07-20 21:22:27,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:27,181 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-20 21:22:27,182 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 21:22:27,182 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-20 21:22:27,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 301 [2020-07-20 21:22:27,188 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:27,189 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 35, 21, 21, 21, 21, 21, 21, 21, 14, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:27,401 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:27,402 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:27,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:27,403 INFO L82 PathProgramCache]: Analyzing trace with hash -1101007572, now seen corresponding path program 5 times [2020-07-20 21:22:27,403 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:27,404 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [288238165] [2020-07-20 21:22:27,404 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:27,528 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:27,528 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:27,530 INFO L263 TraceCheckSpWp]: Trace formula consists of 561 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 21:22:27,535 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:27,706 INFO L134 CoverageAnalysis]: Checked inductivity of 5047 backedges. 159 proven. 1061 refuted. 0 times theorem prover too weak. 3827 trivial. 0 not checked. [2020-07-20 21:22:27,706 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:28,936 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:29,246 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:29,391 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:29,482 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:29,483 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:29,528 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:29,625 INFO L134 CoverageAnalysis]: Checked inductivity of 5047 backedges. 159 proven. 1101 refuted. 0 times theorem prover too weak. 3787 trivial. 0 not checked. [2020-07-20 21:22:29,626 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [288238165] [2020-07-20 21:22:29,626 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:29,627 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-20 21:22:29,627 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [90339891] [2020-07-20 21:22:29,628 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 21:22:29,628 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:29,628 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 21:22:29,629 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:22:29,629 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 17 states. [2020-07-20 21:22:29,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:29,906 INFO L93 Difference]: Finished difference Result 77 states and 222 transitions. [2020-07-20 21:22:29,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 21:22:29,907 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 300 [2020-07-20 21:22:29,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:29,914 INFO L225 Difference]: With dead ends: 77 [2020-07-20 21:22:29,915 INFO L226 Difference]: Without dead ends: 73 [2020-07-20 21:22:29,916 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 605 GetRequests, 572 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:22:29,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-20 21:22:29,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 46. [2020-07-20 21:22:29,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 21:22:29,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-20 21:22:29,939 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 300 [2020-07-20 21:22:29,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:29,940 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-20 21:22:29,940 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 21:22:29,940 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-20 21:22:29,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 469 [2020-07-20 21:22:29,951 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:29,951 INFO L422 BasicCegarLoop]: trace histogram [71, 71, 36, 35, 35, 35, 35, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:30,165 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:30,165 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:30,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:30,166 INFO L82 PathProgramCache]: Analyzing trace with hash -897924696, now seen corresponding path program 6 times [2020-07-20 21:22:30,166 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:30,166 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [451016557] [2020-07-20 21:22:30,167 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:30,355 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:30,356 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:30,358 INFO L263 TraceCheckSpWp]: Trace formula consists of 883 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 21:22:30,366 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:30,545 INFO L134 CoverageAnalysis]: Checked inductivity of 12915 backedges. 306 proven. 1995 refuted. 0 times theorem prover too weak. 10614 trivial. 0 not checked. [2020-07-20 21:22:30,546 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:32,487 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:32,996 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:33,254 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:33,435 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:33,436 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:33,521 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:33,573 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:33,574 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:33,728 INFO L134 CoverageAnalysis]: Checked inductivity of 12915 backedges. 306 proven. 2046 refuted. 0 times theorem prover too weak. 10563 trivial. 0 not checked. [2020-07-20 21:22:33,728 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [451016557] [2020-07-20 21:22:33,728 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:33,728 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-20 21:22:33,729 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1416686954] [2020-07-20 21:22:33,729 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 21:22:33,729 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:33,730 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 21:22:33,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-20 21:22:33,730 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 19 states. [2020-07-20 21:22:34,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:34,083 INFO L93 Difference]: Finished difference Result 82 states and 252 transitions. [2020-07-20 21:22:34,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 21:22:34,083 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 468 [2020-07-20 21:22:34,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:34,087 INFO L225 Difference]: With dead ends: 82 [2020-07-20 21:22:34,088 INFO L226 Difference]: Without dead ends: 78 [2020-07-20 21:22:34,089 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 943 GetRequests, 905 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-20 21:22:34,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-20 21:22:34,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 51. [2020-07-20 21:22:34,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-20 21:22:34,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-20 21:22:34,101 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 468 [2020-07-20 21:22:34,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:34,102 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-20 21:22:34,103 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 21:22:34,103 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-20 21:22:34,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2020-07-20 21:22:34,106 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:34,106 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] [2020-07-20 21:22:34,320 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:34,321 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:34,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:34,322 INFO L82 PathProgramCache]: Analyzing trace with hash -1350718391, now seen corresponding path program 6 times [2020-07-20 21:22:34,322 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:34,323 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [83160248] [2020-07-20 21:22:34,323 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:34,522 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:34,522 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:34,525 INFO L263 TraceCheckSpWp]: Trace formula consists of 844 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 21:22:34,534 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:34,725 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1918 refuted. 0 times theorem prover too weak. 9431 trivial. 0 not checked. [2020-07-20 21:22:34,725 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:36,428 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:37,075 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:37,076 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:37,411 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:37,412 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:37,579 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:37,674 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:37,675 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:37,729 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:37,863 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1975 refuted. 0 times theorem prover too weak. 9374 trivial. 0 not checked. [2020-07-20 21:22:37,864 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [83160248] [2020-07-20 21:22:37,864 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:37,865 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-20 21:22:37,865 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2081475538] [2020-07-20 21:22:37,866 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 21:22:37,866 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:37,866 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 21:22:37,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-20 21:22:37,867 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 19 states. [2020-07-20 21:22:38,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:38,379 INFO L93 Difference]: Finished difference Result 87 states and 284 transitions. [2020-07-20 21:22:38,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 21:22:38,380 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 450 [2020-07-20 21:22:38,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:38,385 INFO L225 Difference]: With dead ends: 87 [2020-07-20 21:22:38,385 INFO L226 Difference]: Without dead ends: 83 [2020-07-20 21:22:38,388 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 [2020-07-20 21:22:38,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-07-20 21:22:38,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 51. [2020-07-20 21:22:38,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-20 21:22:38,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-20 21:22:38,416 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 450 [2020-07-20 21:22:38,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:38,417 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-20 21:22:38,417 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 21:22:38,418 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-20 21:22:38,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 872 [2020-07-20 21:22:38,426 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:38,427 INFO L422 BasicCegarLoop]: trace histogram [133, 133, 67, 66, 66, 66, 66, 66, 66, 66, 66, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:38,639 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:38,640 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:38,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:38,641 INFO L82 PathProgramCache]: Analyzing trace with hash -1701713687, now seen corresponding path program 7 times [2020-07-20 21:22:38,641 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:38,642 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1920878524] [2020-07-20 21:22:38,642 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:39,008 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:39,009 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:39,012 INFO L263 TraceCheckSpWp]: Trace formula consists of 1644 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 21:22:39,025 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:39,569 INFO L134 CoverageAnalysis]: Checked inductivity of 45837 backedges. 778 proven. 4406 refuted. 0 times theorem prover too weak. 40653 trivial. 0 not checked. [2020-07-20 21:22:39,569 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:42,410 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:42,411 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:43,686 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:44,275 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:44,276 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:44,593 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:44,594 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:44,777 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:44,778 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:44,868 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:44,869 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:44,914 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:45,262 INFO L134 CoverageAnalysis]: Checked inductivity of 45837 backedges. 778 proven. 4476 refuted. 0 times theorem prover too weak. 40583 trivial. 0 not checked. [2020-07-20 21:22:45,262 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1920878524] [2020-07-20 21:22:45,263 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:45,263 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-20 21:22:45,263 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [564136321] [2020-07-20 21:22:45,265 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 21:22:45,265 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:45,265 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 21:22:45,265 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-20 21:22:45,266 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 21 states. [2020-07-20 21:22:45,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:45,618 INFO L93 Difference]: Finished difference Result 92 states and 318 transitions. [2020-07-20 21:22:45,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 21:22:45,618 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 871 [2020-07-20 21:22:45,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:45,623 INFO L225 Difference]: With dead ends: 92 [2020-07-20 21:22:45,623 INFO L226 Difference]: Without dead ends: 88 [2020-07-20 21:22:45,626 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1750 GetRequests, 1707 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-20 21:22:45,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-20 21:22:45,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 56. [2020-07-20 21:22:45,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 21:22:45,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-20 21:22:45,650 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 871 [2020-07-20 21:22:45,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:45,652 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-20 21:22:45,653 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 21:22:45,653 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-20 21:22:45,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1229 [2020-07-20 21:22:45,670 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:45,671 INFO L422 BasicCegarLoop]: trace histogram [179, 179, 147, 89, 89, 89, 89, 89, 89, 89, 58, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:45,884 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:45,885 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:45,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:45,885 INFO L82 PathProgramCache]: Analyzing trace with hash 104339052, now seen corresponding path program 7 times [2020-07-20 21:22:45,885 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:45,886 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [605419445] [2020-07-20 21:22:45,886 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:46,347 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:46,348 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:46,351 INFO L263 TraceCheckSpWp]: Trace formula consists of 2293 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 21:22:46,363 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:46,949 INFO L134 CoverageAnalysis]: Checked inductivity of 90119 backedges. 893 proven. 6738 refuted. 0 times theorem prover too weak. 82488 trivial. 0 not checked. [2020-07-20 21:22:46,950 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:50,909 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:50,910 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:52,251 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:52,862 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:52,863 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:53,193 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:53,194 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:53,354 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:53,449 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:53,504 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:54,069 INFO L134 CoverageAnalysis]: Checked inductivity of 90119 backedges. 893 proven. 6815 refuted. 0 times theorem prover too weak. 82411 trivial. 0 not checked. [2020-07-20 21:22:54,069 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [605419445] [2020-07-20 21:22:54,069 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:54,070 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-20 21:22:54,070 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1669647234] [2020-07-20 21:22:54,072 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 21:22:54,072 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:54,072 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 21:22:54,073 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-20 21:22:54,073 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 21 states. [2020-07-20 21:22:54,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:54,570 INFO L93 Difference]: Finished difference Result 97 states and 354 transitions. [2020-07-20 21:22:54,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 21:22:54,571 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1228 [2020-07-20 21:22:54,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:54,577 INFO L225 Difference]: With dead ends: 97 [2020-07-20 21:22:54,577 INFO L226 Difference]: Without dead ends: 93 [2020-07-20 21:22:54,578 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2463 GetRequests, 2420 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-20 21:22:54,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-20 21:22:54,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 56. [2020-07-20 21:22:54,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 21:22:54,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-20 21:22:54,592 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 1228 [2020-07-20 21:22:54,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:54,594 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-20 21:22:54,594 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 21:22:54,594 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-20 21:22:54,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1951 [2020-07-20 21:22:54,623 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:54,624 INFO L422 BasicCegarLoop]: trace histogram [299, 299, 150, 149, 149, 149, 149, 149, 149, 149, 149, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:54,836 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:54,837 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:54,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:54,837 INFO L82 PathProgramCache]: Analyzing trace with hash 621098440, now seen corresponding path program 8 times [2020-07-20 21:22:54,838 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:54,838 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1191201920] [2020-07-20 21:22:54,838 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:55,496 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:55,497 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:55,506 INFO L263 TraceCheckSpWp]: Trace formula consists of 3679 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 21:22:55,528 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:57,249 INFO L134 CoverageAnalysis]: Checked inductivity of 233334 backedges. 1708 proven. 11918 refuted. 0 times theorem prover too weak. 219708 trivial. 0 not checked. [2020-07-20 21:22:57,250 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:23:04,060 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:05,633 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:07,224 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:07,766 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:07,766 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:08,141 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:08,142 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:08,357 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:08,447 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:08,448 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:08,496 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:08,497 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:09,863 INFO L134 CoverageAnalysis]: Checked inductivity of 233334 backedges. 1708 proven. 12010 refuted. 0 times theorem prover too weak. 219616 trivial. 0 not checked. [2020-07-20 21:23:09,863 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1191201920] [2020-07-20 21:23:09,864 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:23:09,864 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-20 21:23:09,865 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [998107193] [2020-07-20 21:23:09,867 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 21:23:09,867 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:23:09,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 21:23:09,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:23:09,868 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 23 states. [2020-07-20 21:23:10,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:23:10,277 INFO L93 Difference]: Finished difference Result 102 states and 392 transitions. [2020-07-20 21:23:10,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 21:23:10,278 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1950 [2020-07-20 21:23:10,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:23:10,284 INFO L225 Difference]: With dead ends: 102 [2020-07-20 21:23:10,284 INFO L226 Difference]: Without dead ends: 98 [2020-07-20 21:23:10,285 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3909 GetRequests, 3861 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-20 21:23:10,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-20 21:23:10,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 61. [2020-07-20 21:23:10,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 21:23:10,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-20 21:23:10,299 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1950 [2020-07-20 21:23:10,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:23:10,301 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-20 21:23:10,301 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 21:23:10,301 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-20 21:23:10,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1690 [2020-07-20 21:23:10,331 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:23:10,331 INFO L422 BasicCegarLoop]: trace histogram [245, 245, 212, 122, 122, 122, 122, 122, 122, 122, 90, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:23:10,546 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:10,547 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:23:10,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:23:10,547 INFO L82 PathProgramCache]: Analyzing trace with hash 249367267, now seen corresponding path program 8 times [2020-07-20 21:23:10,547 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:23:10,548 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [705277264] [2020-07-20 21:23:10,548 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:11,159 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:23:11,159 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:23:11,165 INFO L263 TraceCheckSpWp]: Trace formula consists of 3154 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 21:23:11,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:23:12,540 INFO L134 CoverageAnalysis]: Checked inductivity of 171450 backedges. 1545 proven. 10458 refuted. 0 times theorem prover too weak. 159447 trivial. 0 not checked. [2020-07-20 21:23:12,540 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:23:17,503 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:20,055 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:20,056 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:21,528 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:21,529 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:22,090 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:22,398 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:22,399 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:22,606 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:22,699 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:22,755 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:23,683 INFO L134 CoverageAnalysis]: Checked inductivity of 171450 backedges. 1545 proven. 10558 refuted. 0 times theorem prover too weak. 159347 trivial. 0 not checked. [2020-07-20 21:23:23,684 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [705277264] [2020-07-20 21:23:23,684 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:23:23,684 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-20 21:23:23,685 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1268360749] [2020-07-20 21:23:23,686 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 21:23:23,687 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:23:23,687 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 21:23:23,687 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:23:23,687 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 23 states. [2020-07-20 21:23:24,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:23:24,142 INFO L93 Difference]: Finished difference Result 107 states and 432 transitions. [2020-07-20 21:23:24,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 21:23:24,143 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1689 [2020-07-20 21:23:24,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:23:24,149 INFO L225 Difference]: With dead ends: 107 [2020-07-20 21:23:24,149 INFO L226 Difference]: Without dead ends: 103 [2020-07-20 21:23:24,150 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3386 GetRequests, 3338 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-20 21:23:24,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-20 21:23:24,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 61. [2020-07-20 21:23:24,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 21:23:24,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-20 21:23:24,168 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1689 [2020-07-20 21:23:24,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:23:24,170 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-20 21:23:24,170 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 21:23:24,170 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-20 21:23:24,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2341 [2020-07-20 21:23:24,221 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:23:24,222 INFO L422 BasicCegarLoop]: trace histogram [359, 359, 180, 179, 179, 179, 179, 179, 179, 179, 179, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:23:24,422 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:24,423 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:23:24,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:23:24,425 INFO L82 PathProgramCache]: Analyzing trace with hash 1393099828, now seen corresponding path program 9 times [2020-07-20 21:23:24,425 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:23:24,425 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1519568290] [2020-07-20 21:23:24,426 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:25,244 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:23:25,245 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:23:25,255 INFO L263 TraceCheckSpWp]: Trace formula consists of 4411 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 21:23:25,277 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:23:27,861 INFO L134 CoverageAnalysis]: Checked inductivity of 336699 backedges. 2291 proven. 16027 refuted. 0 times theorem prover too weak. 318381 trivial. 0 not checked. [2020-07-20 21:23:27,861 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:23:35,868 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:39,564 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:41,118 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:42,339 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:42,340 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:42,936 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:42,937 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:43,328 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:43,329 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:43,514 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:43,612 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:43,665 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:45,450 INFO L134 CoverageAnalysis]: Checked inductivity of 336699 backedges. 2291 proven. 16144 refuted. 0 times theorem prover too weak. 318264 trivial. 0 not checked. [2020-07-20 21:23:45,451 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1519568290] [2020-07-20 21:23:45,451 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:23:45,451 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-20 21:23:45,452 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1687380230] [2020-07-20 21:23:45,453 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 21:23:45,454 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:23:45,454 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 21:23:45,454 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-20 21:23:45,454 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 25 states. [2020-07-20 21:23:46,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:23:46,273 INFO L93 Difference]: Finished difference Result 112 states and 474 transitions. [2020-07-20 21:23:46,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 21:23:46,274 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2340 [2020-07-20 21:23:46,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:23:46,281 INFO L225 Difference]: With dead ends: 112 [2020-07-20 21:23:46,281 INFO L226 Difference]: Without dead ends: 108 [2020-07-20 21:23:46,283 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4690 GetRequests, 4637 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 21:23:46,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-20 21:23:46,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 66. [2020-07-20 21:23:46,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-20 21:23:46,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-20 21:23:46,299 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2340 [2020-07-20 21:23:46,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:23:46,300 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-20 21:23:46,301 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 21:23:46,301 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-20 21:23:46,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3629 [2020-07-20 21:23:46,372 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:23:46,374 INFO L422 BasicCegarLoop]: trace histogram [531, 531, 435, 265, 265, 265, 265, 265, 265, 265, 170, 96, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:23:46,574 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:46,575 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:23:46,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:23:46,577 INFO L82 PathProgramCache]: Analyzing trace with hash -161498836, now seen corresponding path program 9 times [2020-07-20 21:23:46,577 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:23:46,577 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1162144834] [2020-07-20 21:23:46,578 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:47,776 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:23:47,776 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:23:47,789 INFO L263 TraceCheckSpWp]: Trace formula consists of 6773 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 21:23:47,813 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:23:51,893 INFO L134 CoverageAnalysis]: Checked inductivity of 797175 backedges. 3064 proven. 26230 refuted. 0 times theorem prover too weak. 767881 trivial. 0 not checked. [2020-07-20 21:23:51,894 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:24:04,831 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:09,662 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:11,545 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:11,546 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:13,047 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:13,780 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:14,174 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:14,351 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:14,458 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:14,458 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:14,518 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:14,519 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:18,449 INFO L134 CoverageAnalysis]: Checked inductivity of 797175 backedges. 3064 proven. 26356 refuted. 0 times theorem prover too weak. 767755 trivial. 0 not checked. [2020-07-20 21:24:18,450 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1162144834] [2020-07-20 21:24:18,450 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:24:18,451 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-20 21:24:18,451 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1457971376] [2020-07-20 21:24:18,453 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 21:24:18,453 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:24:18,454 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 21:24:18,454 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-20 21:24:18,454 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 25 states. [2020-07-20 21:24:19,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:24:19,327 INFO L93 Difference]: Finished difference Result 117 states and 518 transitions. [2020-07-20 21:24:19,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 21:24:19,328 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 3628 [2020-07-20 21:24:19,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:24:19,335 INFO L225 Difference]: With dead ends: 117 [2020-07-20 21:24:19,335 INFO L226 Difference]: Without dead ends: 113 [2020-07-20 21:24:19,336 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7265 GetRequests, 7212 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 21:24:19,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2020-07-20 21:24:19,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 66. [2020-07-20 21:24:19,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-20 21:24:19,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-20 21:24:19,354 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 3628 [2020-07-20 21:24:19,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:24:19,356 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-20 21:24:19,356 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 21:24:19,356 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-20 21:24:19,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4109 [2020-07-20 21:24:19,490 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:24:19,492 INFO L422 BasicCegarLoop]: trace histogram [631, 631, 316, 315, 315, 315, 315, 315, 315, 315, 315, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:24:19,705 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:24:19,706 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:24:19,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:24:19,707 INFO L82 PathProgramCache]: Analyzing trace with hash -268558652, now seen corresponding path program 10 times [2020-07-20 21:24:19,708 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:24:19,708 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1129456230] [2020-07-20 21:24:19,709 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:24:21,048 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:24:21,048 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:24:21,065 INFO L263 TraceCheckSpWp]: Trace formula consists of 7743 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 21:24:21,096 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:24:26,660 INFO L134 CoverageAnalysis]: Checked inductivity of 1042335 backedges. 4162 proven. 31793 refuted. 0 times theorem prover too weak. 1006380 trivial. 0 not checked. [2020-07-20 21:24:26,660 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:24:42,164 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:42,165 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:49,173 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:52,196 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:54,395 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:55,684 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:56,336 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:56,337 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:56,664 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:56,888 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:56,999 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:57,063 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:02,087 INFO L134 CoverageAnalysis]: Checked inductivity of 1042335 backedges. 4162 proven. 31938 refuted. 0 times theorem prover too weak. 1006235 trivial. 0 not checked. [2020-07-20 21:25:02,087 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1129456230] [2020-07-20 21:25:02,087 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:25:02,088 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-20 21:25:02,088 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [831896698] [2020-07-20 21:25:02,091 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 21:25:02,091 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:25:02,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 21:25:02,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-20 21:25:02,092 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 27 states. [2020-07-20 21:25:02,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:25:02,945 INFO L93 Difference]: Finished difference Result 122 states and 564 transitions. [2020-07-20 21:25:02,946 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 21:25:02,946 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 4108 [2020-07-20 21:25:02,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:25:02,952 INFO L225 Difference]: With dead ends: 122 [2020-07-20 21:25:02,953 INFO L226 Difference]: Without dead ends: 118 [2020-07-20 21:25:02,954 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8227 GetRequests, 8169 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 21:25:02,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-20 21:25:02,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 71. [2020-07-20 21:25:02,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-20 21:25:02,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-20 21:25:02,975 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 4108 [2020-07-20 21:25:02,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:25:02,978 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-20 21:25:02,978 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 21:25:02,979 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-20 21:25:03,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4411 [2020-07-20 21:25:03,090 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:25:03,091 INFO L422 BasicCegarLoop]: trace histogram [647, 647, 521, 323, 323, 323, 323, 323, 323, 323, 198, 126, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:25:03,292 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:25:03,292 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:25:03,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:25:03,295 INFO L82 PathProgramCache]: Analyzing trace with hash 473290272, now seen corresponding path program 10 times [2020-07-20 21:25:03,295 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:25:03,295 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [260822921] [2020-07-20 21:25:03,296 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:25:04,776 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:25:04,776 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:25:04,793 INFO L263 TraceCheckSpWp]: Trace formula consists of 8239 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 21:25:04,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:25:10,946 INFO L134 CoverageAnalysis]: Checked inductivity of 1179396 backedges. 4083 proven. 35280 refuted. 0 times theorem prover too weak. 1140033 trivial. 0 not checked. [2020-07-20 21:25:10,946 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:25:29,662 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:34,735 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:34,736 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:39,040 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:39,041 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:40,825 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:40,825 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:42,270 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:42,271 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:42,988 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:42,989 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:43,326 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:43,558 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:43,559 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:43,672 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:43,673 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:43,743 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:49,810 INFO L134 CoverageAnalysis]: Checked inductivity of 1179396 backedges. 4083 proven. 35435 refuted. 0 times theorem prover too weak. 1139878 trivial. 0 not checked. [2020-07-20 21:25:49,810 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [260822921] [2020-07-20 21:25:49,810 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:25:49,811 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-20 21:25:49,812 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [33414225] [2020-07-20 21:25:49,814 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 21:25:49,814 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:25:49,815 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 21:25:49,815 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-20 21:25:49,815 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 27 states. [2020-07-20 21:25:51,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:25:51,072 INFO L93 Difference]: Finished difference Result 127 states and 612 transitions. [2020-07-20 21:25:51,075 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 21:25:51,076 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 4410 [2020-07-20 21:25:51,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:25:51,081 INFO L225 Difference]: With dead ends: 127 [2020-07-20 21:25:51,081 INFO L226 Difference]: Without dead ends: 123 [2020-07-20 21:25:51,083 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8830 GetRequests, 8772 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 21:25:51,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2020-07-20 21:25:51,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 71. [2020-07-20 21:25:51,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-20 21:25:51,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-20 21:25:51,103 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 4410 [2020-07-20 21:25:51,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:25:51,106 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-20 21:25:51,106 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 21:25:51,107 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-20 21:25:51,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7723 [2020-07-20 21:25:51,379 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:25:51,382 INFO L422 BasicCegarLoop]: trace histogram [1187, 1187, 594, 593, 593, 593, 593, 593, 593, 593, 593, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:25:51,582 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:25:51,583 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:25:51,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:25:51,586 INFO L82 PathProgramCache]: Analyzing trace with hash -891813170, now seen corresponding path program 11 times [2020-07-20 21:25:51,586 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:25:51,586 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1122503464] [2020-07-20 21:25:51,587 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:25:54,045 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:25:54,045 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:25:54,080 INFO L263 TraceCheckSpWp]: Trace formula consists of 14557 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 21:25:54,132 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:26:11,526 INFO L134 CoverageAnalysis]: Checked inductivity of 3693204 backedges. 8201 proven. 66406 refuted. 0 times theorem prover too weak. 3618597 trivial. 0 not checked. [2020-07-20 21:26:11,526 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:26:49,308 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:01,762 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:08,160 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:08,160 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:13,771 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:13,772 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:16,450 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:17,684 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:17,685 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:18,591 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:18,592 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:19,079 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:19,292 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:19,293 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:19,415 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:19,485 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:37,533 INFO L134 CoverageAnalysis]: Checked inductivity of 3693204 backedges. 8201 proven. 66582 refuted. 0 times theorem prover too weak. 3618421 trivial. 0 not checked. [2020-07-20 21:27:37,534 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1122503464] [2020-07-20 21:27:37,534 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:27:37,537 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-20 21:27:37,537 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [16699977] [2020-07-20 21:27:37,542 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 21:27:37,543 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:27:37,543 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 21:27:37,543 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-20 21:27:37,543 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 29 states. [2020-07-20 21:27:39,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:27:39,113 INFO L93 Difference]: Finished difference Result 132 states and 662 transitions. [2020-07-20 21:27:39,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 21:27:39,115 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 7722 [2020-07-20 21:27:39,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:27:39,124 INFO L225 Difference]: With dead ends: 132 [2020-07-20 21:27:39,124 INFO L226 Difference]: Without dead ends: 128 [2020-07-20 21:27:39,125 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15456 GetRequests, 15393 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-20 21:27:39,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-07-20 21:27:39,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 76. [2020-07-20 21:27:39,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-20 21:27:39,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-20 21:27:39,149 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 7722 [2020-07-20 21:27:39,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:27:39,156 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-20 21:27:39,156 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 21:27:39,156 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-20 21:27:39,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8561 [2020-07-20 21:27:39,976 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:27:39,981 INFO L422 BasicCegarLoop]: trace histogram [1255, 1255, 1023, 627, 627, 627, 627, 627, 627, 627, 396, 232, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:27:40,194 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:27:40,195 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:27:40,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:27:40,199 INFO L82 PathProgramCache]: Analyzing trace with hash 1561997516, now seen corresponding path program 11 times [2020-07-20 21:27:40,199 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:27:40,200 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [607279530] [2020-07-20 21:27:40,201 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:27:42,998 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:27:42,998 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:27:43,038 INFO L263 TraceCheckSpWp]: Trace formula consists of 15981 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 21:27:43,102 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:28:03,812 INFO L134 CoverageAnalysis]: Checked inductivity of 4455297 backedges. 7685 proven. 76596 refuted. 0 times theorem prover too weak. 4371016 trivial. 0 not checked. [2020-07-20 21:28:03,812 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:28:13,497 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-20 21:28:13,600 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-20 21:28:54,261 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-20 21:28:56,064 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:56,065 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:12,682 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:18,389 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 21:29:19,383 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:19,384 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:23,159 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:23,160 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:26,067 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:26,068 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:27,373 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:27,374 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:28,355 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:28,876 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:29,111 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:29,112 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:29,243 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:29,244 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:29,318 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:50,811 INFO L134 CoverageAnalysis]: Checked inductivity of 4455297 backedges. 7685 proven. 76783 refuted. 0 times theorem prover too weak. 4370829 trivial. 0 not checked. [2020-07-20 21:29:50,811 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [607279530] [2020-07-20 21:29:50,811 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:29:50,813 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-20 21:29:50,814 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1688421621] [2020-07-20 21:29:50,819 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 21:29:50,819 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:29:50,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 21:29:50,820 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-20 21:29:50,820 INFO L87 Difference]: Start difference. First operand 76 states and 234 transitions. Second operand 29 states. [2020-07-20 21:29:52,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:29:52,578 INFO L93 Difference]: Finished difference Result 137 states and 714 transitions. [2020-07-20 21:29:52,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 21:29:52,581 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 8560 [2020-07-20 21:29:52,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:29:52,593 INFO L225 Difference]: With dead ends: 137 [2020-07-20 21:29:52,594 INFO L226 Difference]: Without dead ends: 133 [2020-07-20 21:29:52,595 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17131 GetRequests, 17068 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-20 21:29:52,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-07-20 21:29:52,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 76. [2020-07-20 21:29:52,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-20 21:29:52,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-20 21:29:52,621 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 8560 [2020-07-20 21:29:52,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:29:52,625 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-20 21:29:52,626 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 21:29:52,626 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-20 21:29:54,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18136 [2020-07-20 21:29:54,748 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:29:54,754 INFO L422 BasicCegarLoop]: trace histogram [2789, 2789, 1395, 1394, 1394, 1394, 1394, 1394, 1394, 1394, 1394, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:29:54,954 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:29:54,954 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:29:54,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:29:54,959 INFO L82 PathProgramCache]: Analyzing trace with hash 1122062087, now seen corresponding path program 12 times [2020-07-20 21:29:54,959 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:29:54,960 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [458410607] [2020-07-20 21:29:54,960 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:30:00,575 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:30:00,576 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:30:00,693 INFO L263 TraceCheckSpWp]: Trace formula consists of 34180 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-20 21:30:00,821 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:32:03,463 INFO L134 CoverageAnalysis]: Checked inductivity of 20406069 backedges. 20534 proven. 171004 refuted. 0 times theorem prover too weak. 20214531 trivial. 0 not checked. [2020-07-20 21:32:03,464 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:32:25,204 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 21:32:25,347 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 21:32:25,501 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 21:32:25,651 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 21:32:25,783 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 91 [2020-07-20 21:32:25,900 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2020-07-20 21:32:26,011 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2020-07-20 21:32:26,131 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 81 [2020-07-20 21:32:26,248 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-20 21:32:26,360 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2020-07-20 21:32:26,463 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 21:34:15,889 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 21:34:16,097 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 21:34:16,206 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 21:34:21,300 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 21:34:21,406 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 21:34:21,516 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 21:34:21,636 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2020-07-20 21:34:21,745 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-20 21:34:22,695 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:18,433 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 21:35:18,540 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 21:35:18,645 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 21:35:19,596 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:19,597 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts