/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_7-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 13:23:55,915 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 13:23:55,920 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 13:23:55,942 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 13:23:55,943 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 13:23:55,945 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 13:23:55,948 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 13:23:55,952 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 13:23:55,955 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 13:23:55,957 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 13:23:55,959 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 13:23:55,961 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 13:23:55,962 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 13:23:55,964 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 13:23:55,966 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 13:23:55,968 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 13:23:55,970 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 13:23:55,977 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 13:23:55,984 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 13:23:55,988 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 13:23:55,991 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 13:23:55,993 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 13:23:55,995 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 13:23:55,997 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 13:23:56,001 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 13:23:56,017 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 13:23:56,018 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 13:23:56,020 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 13:23:56,022 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 13:23:56,045 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 13:23:56,046 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 13:23:56,048 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 13:23:56,049 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 13:23:56,049 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 13:23:56,050 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 13:23:56,050 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 13:23:56,050 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 13:23:56,050 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 13:23:56,050 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 13:23:56,051 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 13:23:56,051 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 13:23:56,052 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 13:23:56,052 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 13:23:56,052 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 13:23:56,053 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 13:23:56,053 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 13:23:56,053 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 13:23:56,054 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 13:23:56,054 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 13:23:56,054 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 13:23:56,054 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 13:23:56,055 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 13:23:56,055 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 13:23:56,055 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 13:23:56,055 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 13:23:56,056 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:23:56,056 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 13:23:56,056 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 13:23:56,056 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 13:23:56,669 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 13:23:56,710 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 13:23:56,717 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 13:23:56,721 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 13:23:56,726 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 13:23:56,731 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_7-1.c [2020-07-21 13:23:56,902 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ed9909c67/42624e7c58454fa7a6b5a8180c65b78b/FLAG148e89aaf [2020-07-21 13:23:57,769 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 13:23:57,771 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_7-1.c [2020-07-21 13:23:57,783 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ed9909c67/42624e7c58454fa7a6b5a8180c65b78b/FLAG148e89aaf [2020-07-21 13:23:57,815 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ed9909c67/42624e7c58454fa7a6b5a8180c65b78b [2020-07-21 13:23:57,835 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 13:23:57,841 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 13:23:57,843 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 13:23:57,844 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 13:23:57,851 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 13:23:57,853 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:23:57" (1/1) ... [2020-07-21 13:23:57,859 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@36769e5b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:23:57, skipping insertion in model container [2020-07-21 13:23:57,860 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:23:57" (1/1) ... [2020-07-21 13:23:57,873 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 13:23:57,902 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 13:23:58,208 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 13:23:58,222 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 13:23:58,253 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 13:23:58,285 INFO L208 MainTranslator]: Completed translation [2020-07-21 13:23:58,286 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:23:58 WrapperNode [2020-07-21 13:23:58,287 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 13:23:58,289 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 13:23:58,290 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 13:23:58,290 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 13:23:58,321 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:23:58" (1/1) ... [2020-07-21 13:23:58,323 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:23:58" (1/1) ... [2020-07-21 13:23:58,337 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:23:58" (1/1) ... [2020-07-21 13:23:58,338 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:23:58" (1/1) ... [2020-07-21 13:23:58,351 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:23:58" (1/1) ... [2020-07-21 13:23:58,356 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:23:58" (1/1) ... [2020-07-21 13:23:58,359 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:23:58" (1/1) ... [2020-07-21 13:23:58,363 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 13:23:58,367 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 13:23:58,368 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 13:23:58,368 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 13:23:58,371 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:23:58" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 13:23:58,694 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 13:23:58,695 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 13:23:58,696 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-21 13:23:58,696 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 13:23:58,697 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 13:23:58,699 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 13:23:58,700 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-21 13:23:58,701 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 13:23:58,701 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 13:23:58,701 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 13:23:59,094 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 13:23:59,095 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 13:23:59,103 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:23:59 BoogieIcfgContainer [2020-07-21 13:23:59,104 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 13:23:59,106 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 13:23:59,107 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 13:23:59,113 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 13:23:59,114 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 01:23:57" (1/3) ... [2020-07-21 13:23:59,116 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@310a8614 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:23:59, skipping insertion in model container [2020-07-21 13:23:59,117 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:23:58" (2/3) ... [2020-07-21 13:23:59,118 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@310a8614 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:23:59, skipping insertion in model container [2020-07-21 13:23:59,118 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:23:59" (3/3) ... [2020-07-21 13:23:59,122 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_7-1.c [2020-07-21 13:23:59,142 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 13:23:59,157 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 13:23:59,183 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 13:23:59,228 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 13:23:59,228 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 13:23:59,228 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 13:23:59,229 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 13:23:59,229 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 13:23:59,229 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 13:23:59,229 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 13:23:59,229 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 13:23:59,265 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-21 13:23:59,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 13:23:59,277 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:23:59,279 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:23:59,281 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:23:59,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:23:59,294 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-21 13:23:59,308 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:23:59,309 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1905021680] [2020-07-21 13:23:59,310 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:23:59,434 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:23:59,435 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:23:59,439 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 13:23:59,449 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:23:59,634 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:23:59,635 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:23:59,638 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1905021680] [2020-07-21 13:23:59,640 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:23:59,641 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 13:23:59,644 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [703778846] [2020-07-21 13:23:59,656 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 13:23:59,657 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:23:59,685 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 13:23:59,688 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 13:23:59,693 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-21 13:23:59,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:23:59,917 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-21 13:23:59,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 13:23:59,922 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 13:23:59,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:23:59,938 INFO L225 Difference]: With dead ends: 35 [2020-07-21 13:23:59,939 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 13:23:59,944 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 13:23:59,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 13:24:00,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 13:24:00,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 13:24:00,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 13:24:00,035 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-21 13:24:00,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:00,037 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 13:24:00,037 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 13:24:00,037 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 13:24:00,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 13:24:00,042 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:00,045 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:00,263 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:00,264 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:00,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:00,265 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-21 13:24:00,266 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:00,266 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [564101335] [2020-07-21 13:24:00,267 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:00,313 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:00,314 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:00,315 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 13:24:00,321 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:00,370 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:24:00,371 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:24:00,372 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [564101335] [2020-07-21 13:24:00,372 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:24:00,373 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 13:24:00,373 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [134136655] [2020-07-21 13:24:00,376 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 13:24:00,377 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:00,378 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 13:24:00,378 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 13:24:00,379 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-21 13:24:00,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:00,507 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-21 13:24:00,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 13:24:00,509 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 13:24:00,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:00,511 INFO L225 Difference]: With dead ends: 27 [2020-07-21 13:24:00,512 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 13:24:00,515 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 13:24:00,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 13:24:00,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-21 13:24:00,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 13:24:00,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 13:24:00,529 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-21 13:24:00,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:00,530 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 13:24:00,530 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 13:24:00,531 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 13:24:00,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 13:24:00,533 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:00,533 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:00,748 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:00,749 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:00,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:00,752 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-21 13:24:00,752 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:00,753 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [598404851] [2020-07-21 13:24:00,753 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:00,806 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:00,807 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:00,809 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 13:24:00,813 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:00,905 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 13:24:00,906 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:24:01,285 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:01,387 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 13:24:01,388 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [598404851] [2020-07-21 13:24:01,389 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:24:01,389 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 13:24:01,390 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2067826479] [2020-07-21 13:24:01,391 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 13:24:01,392 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:01,392 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 13:24:01,393 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 13:24:01,394 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-21 13:24:01,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:01,645 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-21 13:24:01,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 13:24:01,647 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-21 13:24:01,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:01,650 INFO L225 Difference]: With dead ends: 32 [2020-07-21 13:24:01,650 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 13:24:01,652 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 13:24:01,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 13:24:01,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-21 13:24:01,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 13:24:01,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 13:24:01,666 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-21 13:24:01,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:01,668 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 13:24:01,668 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 13:24:01,668 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 13:24:01,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 13:24:01,671 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:01,672 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:01,887 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:01,888 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:01,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:01,890 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-21 13:24:01,890 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:01,891 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [641845977] [2020-07-21 13:24:01,891 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:01,956 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:01,956 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:01,958 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 13:24:01,964 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:02,058 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 13:24:02,059 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:24:02,341 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:02,411 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 13:24:02,412 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [641845977] [2020-07-21 13:24:02,413 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:24:02,413 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 13:24:02,413 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1626953631] [2020-07-21 13:24:02,414 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 13:24:02,415 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:02,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 13:24:02,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 13:24:02,416 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-21 13:24:02,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:02,578 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-21 13:24:02,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 13:24:02,580 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-21 13:24:02,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:02,583 INFO L225 Difference]: With dead ends: 37 [2020-07-21 13:24:02,584 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 13:24:02,585 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 13:24:02,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 13:24:02,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-21 13:24:02,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 13:24:02,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 13:24:02,600 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-21 13:24:02,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:02,601 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 13:24:02,601 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 13:24:02,601 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 13:24:02,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 13:24:02,605 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:02,605 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:02,821 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:02,822 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:02,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:02,823 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-21 13:24:02,825 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:02,826 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [197215565] [2020-07-21 13:24:02,827 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:02,899 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:02,900 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:02,902 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 13:24:02,905 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:02,969 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 13:24:02,970 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:24:03,347 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:03,350 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:03,432 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:03,435 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:03,498 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 13:24:03,499 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [197215565] [2020-07-21 13:24:03,500 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:24:03,500 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 13:24:03,501 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1796601227] [2020-07-21 13:24:03,502 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 13:24:03,503 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:03,503 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 13:24:03,504 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 13:24:03,504 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-21 13:24:03,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:03,779 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-21 13:24:03,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 13:24:03,780 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-21 13:24:03,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:03,784 INFO L225 Difference]: With dead ends: 42 [2020-07-21 13:24:03,784 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 13:24:03,786 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 64 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 13:24:03,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 13:24:03,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-21 13:24:03,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 13:24:03,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 13:24:03,801 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-21 13:24:03,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:03,801 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 13:24:03,801 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 13:24:03,802 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 13:24:03,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 13:24:03,805 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:03,805 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:04,020 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:04,022 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:04,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:04,023 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-21 13:24:04,024 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:04,024 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [181390136] [2020-07-21 13:24:04,025 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:04,080 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:04,080 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:04,083 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 13:24:04,094 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:04,153 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-21 13:24:04,154 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:24:04,500 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:04,598 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:04,609 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:04,673 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 13:24:04,674 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [181390136] [2020-07-21 13:24:04,674 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:24:04,675 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 13:24:04,675 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1751047115] [2020-07-21 13:24:04,676 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 13:24:04,676 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:04,677 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 13:24:04,677 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 13:24:04,677 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-21 13:24:04,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:04,901 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-21 13:24:04,902 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 13:24:04,902 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-21 13:24:04,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:04,915 INFO L225 Difference]: With dead ends: 47 [2020-07-21 13:24:04,916 INFO L226 Difference]: Without dead ends: 43 [2020-07-21 13:24:04,918 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 13:24:04,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-21 13:24:04,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-21 13:24:04,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 13:24:04,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 13:24:04,956 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-21 13:24:04,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:04,959 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 13:24:04,959 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 13:24:04,959 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 13:24:04,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-21 13:24:04,970 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:04,971 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:05,171 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:05,173 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:05,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:05,174 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-21 13:24:05,175 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:05,175 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [654181030] [2020-07-21 13:24:05,175 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:05,241 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:05,242 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:05,244 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 13:24:05,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:05,342 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 79 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-21 13:24:05,342 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:24:05,956 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:06,095 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:06,097 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:06,165 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:06,167 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:06,234 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-21 13:24:06,235 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [654181030] [2020-07-21 13:24:06,235 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:24:06,235 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 13:24:06,236 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2001247155] [2020-07-21 13:24:06,237 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 13:24:06,237 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:06,238 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 13:24:06,238 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 13:24:06,238 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-21 13:24:06,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:06,545 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-21 13:24:06,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 13:24:06,546 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-21 13:24:06,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:06,551 INFO L225 Difference]: With dead ends: 52 [2020-07-21 13:24:06,552 INFO L226 Difference]: Without dead ends: 48 [2020-07-21 13:24:06,554 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 111 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-21 13:24:06,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-21 13:24:06,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-21 13:24:06,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 13:24:06,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 13:24:06,570 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-21 13:24:06,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:06,571 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 13:24:06,571 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 13:24:06,572 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 13:24:06,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-21 13:24:06,575 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:06,575 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:06,784 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:06,786 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:06,786 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:06,787 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-21 13:24:06,788 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:06,788 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1496590056] [2020-07-21 13:24:06,789 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:06,862 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:06,863 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:06,865 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 13:24:06,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:07,012 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-07-21 13:24:07,013 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:24:07,605 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:07,731 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:07,733 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:07,803 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:07,870 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 181 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-07-21 13:24:07,871 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1496590056] [2020-07-21 13:24:07,871 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:24:07,871 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 13:24:07,872 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1753496964] [2020-07-21 13:24:07,872 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 13:24:07,873 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:07,873 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 13:24:07,874 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 13:24:07,874 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 13 states. [2020-07-21 13:24:08,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:08,103 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-21 13:24:08,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 13:24:08,104 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 96 [2020-07-21 13:24:08,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:08,109 INFO L225 Difference]: With dead ends: 57 [2020-07-21 13:24:08,109 INFO L226 Difference]: Without dead ends: 53 [2020-07-21 13:24:08,111 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 172 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-21 13:24:08,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-21 13:24:08,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-21 13:24:08,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 13:24:08,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 13:24:08,130 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-21 13:24:08,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:08,131 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 13:24:08,132 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 13:24:08,132 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 13:24:08,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-21 13:24:08,135 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:08,135 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:08,352 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:08,353 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:08,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:08,354 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-21 13:24:08,355 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:08,355 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2023330201] [2020-07-21 13:24:08,356 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:08,450 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:08,451 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:08,454 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 13:24:08,461 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:08,642 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 244 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2020-07-21 13:24:08,643 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:24:09,426 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:09,428 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:09,670 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:09,786 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:09,857 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:09,928 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 266 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-21 13:24:09,929 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2023330201] [2020-07-21 13:24:09,929 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:24:09,930 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 13:24:09,930 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [59343398] [2020-07-21 13:24:09,931 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 13:24:09,932 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:09,932 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 13:24:09,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 13:24:09,933 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 15 states. [2020-07-21 13:24:10,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:10,370 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-21 13:24:10,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 13:24:10,371 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 117 [2020-07-21 13:24:10,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:10,374 INFO L225 Difference]: With dead ends: 62 [2020-07-21 13:24:10,375 INFO L226 Difference]: Without dead ends: 58 [2020-07-21 13:24:10,377 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 211 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-21 13:24:10,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-21 13:24:10,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-21 13:24:10,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 13:24:10,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 13:24:10,397 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-21 13:24:10,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:10,398 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 13:24:10,398 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 13:24:10,398 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 13:24:10,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-21 13:24:10,403 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:10,403 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 21, 13, 13, 13, 13, 13, 13, 13, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:10,619 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:10,620 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:10,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:10,621 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-21 13:24:10,622 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:10,622 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1562242377] [2020-07-21 13:24:10,623 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:10,744 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:10,745 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:10,748 INFO L263 TraceCheckSpWp]: Trace formula consists of 423 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 13:24:10,755 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:10,871 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 506 refuted. 0 times theorem prover too weak. 1334 trivial. 0 not checked. [2020-07-21 13:24:10,871 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:24:11,790 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:12,065 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:12,179 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:12,181 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:12,239 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:12,241 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:12,317 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 532 refuted. 0 times theorem prover too weak. 1308 trivial. 0 not checked. [2020-07-21 13:24:12,318 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1562242377] [2020-07-21 13:24:12,318 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:24:12,319 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 13:24:12,319 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2042421280] [2020-07-21 13:24:12,320 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 13:24:12,320 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:12,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 13:24:12,321 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 13:24:12,321 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 15 states. [2020-07-21 13:24:12,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:12,575 INFO L93 Difference]: Finished difference Result 67 states and 168 transitions. [2020-07-21 13:24:12,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 13:24:12,576 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 190 [2020-07-21 13:24:12,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:12,579 INFO L225 Difference]: With dead ends: 67 [2020-07-21 13:24:12,580 INFO L226 Difference]: Without dead ends: 63 [2020-07-21 13:24:12,581 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 356 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-21 13:24:12,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-21 13:24:12,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 41. [2020-07-21 13:24:12,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 13:24:12,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 13:24:12,598 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 190 [2020-07-21 13:24:12,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:12,599 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 13:24:12,600 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 13:24:12,600 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 13:24:12,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-21 13:24:12,605 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:12,606 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 22, 21, 21, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:12,822 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:12,823 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:12,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:12,824 INFO L82 PathProgramCache]: Analyzing trace with hash -1082984306, now seen corresponding path program 5 times [2020-07-21 13:24:12,825 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:12,825 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2062414547] [2020-07-21 13:24:12,826 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:13,003 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:13,003 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:13,007 INFO L263 TraceCheckSpWp]: Trace formula consists of 639 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 13:24:13,015 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:13,155 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 967 refuted. 0 times theorem prover too weak. 3536 trivial. 0 not checked. [2020-07-21 13:24:13,155 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:24:14,592 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:14,986 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:15,205 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:15,361 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:15,418 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:15,419 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:15,504 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 1002 refuted. 0 times theorem prover too weak. 3501 trivial. 0 not checked. [2020-07-21 13:24:15,505 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2062414547] [2020-07-21 13:24:15,505 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:24:15,506 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 13:24:15,506 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [998347685] [2020-07-21 13:24:15,507 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 13:24:15,507 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:15,508 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 13:24:15,508 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 13:24:15,508 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 17 states. [2020-07-21 13:24:15,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:15,840 INFO L93 Difference]: Finished difference Result 72 states and 194 transitions. [2020-07-21 13:24:15,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 13:24:15,841 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 286 [2020-07-21 13:24:15,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:15,845 INFO L225 Difference]: With dead ends: 72 [2020-07-21 13:24:15,845 INFO L226 Difference]: Without dead ends: 68 [2020-07-21 13:24:15,847 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 545 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-21 13:24:15,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-07-21 13:24:15,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-07-21 13:24:15,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 13:24:15,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-21 13:24:15,865 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 286 [2020-07-21 13:24:15,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:15,867 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-21 13:24:15,867 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 13:24:15,867 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-21 13:24:15,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2020-07-21 13:24:15,872 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:15,873 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 34, 21, 21, 21, 21, 21, 21, 21, 13, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:16,087 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:16,088 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:16,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:16,089 INFO L82 PathProgramCache]: Analyzing trace with hash 1006419304, now seen corresponding path program 5 times [2020-07-21 13:24:16,090 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:16,090 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1963968] [2020-07-21 13:24:16,091 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:16,280 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:16,281 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:16,285 INFO L263 TraceCheckSpWp]: Trace formula consists of 665 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 13:24:16,295 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:16,553 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 159 proven. 1055 refuted. 0 times theorem prover too weak. 3799 trivial. 0 not checked. [2020-07-21 13:24:16,553 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:24:18,186 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:18,587 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:18,760 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:18,857 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:18,858 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:18,910 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:19,028 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 159 proven. 1095 refuted. 0 times theorem prover too weak. 3759 trivial. 0 not checked. [2020-07-21 13:24:19,029 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1963968] [2020-07-21 13:24:19,029 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:24:19,029 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 16 [2020-07-21 13:24:19,030 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [784382147] [2020-07-21 13:24:19,031 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 13:24:19,032 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:19,032 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 13:24:19,033 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=169, Unknown=0, NotChecked=0, Total=240 [2020-07-21 13:24:19,033 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 16 states. [2020-07-21 13:24:19,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:19,395 INFO L93 Difference]: Finished difference Result 77 states and 222 transitions. [2020-07-21 13:24:19,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 13:24:19,396 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 299 [2020-07-21 13:24:19,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:19,408 INFO L225 Difference]: With dead ends: 77 [2020-07-21 13:24:19,409 INFO L226 Difference]: Without dead ends: 73 [2020-07-21 13:24:19,411 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 603 GetRequests, 570 SyntacticMatches, 13 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=161, Invalid=301, Unknown=0, NotChecked=0, Total=462 [2020-07-21 13:24:19,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-21 13:24:19,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 46. [2020-07-21 13:24:19,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 13:24:19,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-21 13:24:19,458 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 299 [2020-07-21 13:24:19,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:19,460 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-21 13:24:19,460 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 13:24:19,461 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-21 13:24:19,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 508 [2020-07-21 13:24:19,479 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:19,480 INFO L422 BasicCegarLoop]: trace histogram [77, 77, 39, 38, 38, 38, 38, 38, 38, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:19,694 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:19,695 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:19,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:19,696 INFO L82 PathProgramCache]: Analyzing trace with hash 785285043, now seen corresponding path program 6 times [2020-07-21 13:24:19,696 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:19,696 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [893692789] [2020-07-21 13:24:19,697 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:20,003 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:20,004 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:20,012 INFO L263 TraceCheckSpWp]: Trace formula consists of 1132 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 13:24:20,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:20,400 INFO L134 CoverageAnalysis]: Checked inductivity of 15219 backedges. 391 proven. 2126 refuted. 0 times theorem prover too weak. 12702 trivial. 0 not checked. [2020-07-21 13:24:20,400 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:24:22,730 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:23,348 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:23,764 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:24,023 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:24,025 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:24,161 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:24,224 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:24,225 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:24,479 INFO L134 CoverageAnalysis]: Checked inductivity of 15219 backedges. 391 proven. 2177 refuted. 0 times theorem prover too weak. 12651 trivial. 0 not checked. [2020-07-21 13:24:24,480 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [893692789] [2020-07-21 13:24:24,480 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:24:24,481 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 18 [2020-07-21 13:24:24,481 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1263779254] [2020-07-21 13:24:24,482 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 13:24:24,482 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:24,483 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 13:24:24,483 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=217, Unknown=0, NotChecked=0, Total=306 [2020-07-21 13:24:24,483 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 18 states. [2020-07-21 13:24:25,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:25,204 INFO L93 Difference]: Finished difference Result 82 states and 252 transitions. [2020-07-21 13:24:25,205 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 13:24:25,205 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 507 [2020-07-21 13:24:25,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:25,211 INFO L225 Difference]: With dead ends: 82 [2020-07-21 13:24:25,211 INFO L226 Difference]: Without dead ends: 78 [2020-07-21 13:24:25,212 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1021 GetRequests, 983 SyntacticMatches, 15 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=208, Invalid=392, Unknown=0, NotChecked=0, Total=600 [2020-07-21 13:24:25,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-21 13:24:25,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 51. [2020-07-21 13:24:25,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 13:24:25,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-21 13:24:25,252 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 507 [2020-07-21 13:24:25,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:25,258 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-21 13:24:25,258 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 13:24:25,258 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-21 13:24:25,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2020-07-21 13:24:25,266 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:25,267 INFO L422 BasicCegarLoop]: trace histogram [65, 65, 53, 32, 32, 32, 32, 32, 32, 32, 21, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:25,480 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:25,481 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:25,481 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:25,482 INFO L82 PathProgramCache]: Analyzing trace with hash -1350718391, now seen corresponding path program 6 times [2020-07-21 13:24:25,482 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:25,482 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1688277600] [2020-07-21 13:24:25,482 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:25,739 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:25,740 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:25,747 INFO L263 TraceCheckSpWp]: Trace formula consists of 1000 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 13:24:25,760 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:26,074 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 648 proven. 1709 refuted. 0 times theorem prover too weak. 9325 trivial. 0 not checked. [2020-07-21 13:24:26,074 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:24:28,234 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:28,236 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:28,983 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:28,985 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:29,232 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:29,405 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:29,406 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:29,534 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:29,605 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:29,688 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:29,912 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 652 proven. 1756 refuted. 0 times theorem prover too weak. 9274 trivial. 0 not checked. [2020-07-21 13:24:29,913 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1688277600] [2020-07-21 13:24:29,913 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:24:29,913 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 18 [2020-07-21 13:24:29,914 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1768378427] [2020-07-21 13:24:29,915 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 13:24:29,915 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:29,915 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 13:24:29,916 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=217, Unknown=0, NotChecked=0, Total=306 [2020-07-21 13:24:29,916 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 18 states. [2020-07-21 13:24:30,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:30,325 INFO L93 Difference]: Finished difference Result 147 states and 749 transitions. [2020-07-21 13:24:30,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 13:24:30,327 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 450 [2020-07-21 13:24:30,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:30,330 INFO L225 Difference]: With dead ends: 147 [2020-07-21 13:24:30,331 INFO L226 Difference]: Without dead ends: 70 [2020-07-21 13:24:30,337 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 906 GetRequests, 868 SyntacticMatches, 15 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=208, Invalid=392, Unknown=0, NotChecked=0, Total=600 [2020-07-21 13:24:30,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-07-21 13:24:30,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2020-07-21 13:24:30,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-21 13:24:30,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 122 transitions. [2020-07-21 13:24:30,354 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 122 transitions. Word has length 450 [2020-07-21 13:24:30,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:30,355 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 122 transitions. [2020-07-21 13:24:30,355 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 13:24:30,356 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 122 transitions. [2020-07-21 13:24:30,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 328 [2020-07-21 13:24:30,361 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:30,362 INFO L422 BasicCegarLoop]: trace histogram [47, 47, 38, 23, 23, 23, 23, 23, 23, 23, 15, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:30,576 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:30,576 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:30,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:30,578 INFO L82 PathProgramCache]: Analyzing trace with hash -530192014, now seen corresponding path program 7 times [2020-07-21 13:24:30,578 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:30,579 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1650108391] [2020-07-21 13:24:30,579 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:30,860 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:30,861 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:30,866 INFO L263 TraceCheckSpWp]: Trace formula consists of 727 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 13:24:30,878 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:31,118 INFO L134 CoverageAnalysis]: Checked inductivity of 6039 backedges. 1091 proven. 461 refuted. 0 times theorem prover too weak. 4487 trivial. 0 not checked. [2020-07-21 13:24:31,119 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:24:32,788 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:33,207 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:33,208 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:33,484 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:33,668 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:33,669 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:33,771 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:33,836 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:33,836 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:33,978 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:34,310 INFO L134 CoverageAnalysis]: Checked inductivity of 6039 backedges. 1091 proven. 518 refuted. 0 times theorem prover too weak. 4430 trivial. 0 not checked. [2020-07-21 13:24:34,311 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1650108391] [2020-07-21 13:24:34,312 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:24:34,312 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 18 [2020-07-21 13:24:34,312 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1798117038] [2020-07-21 13:24:34,313 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 13:24:34,313 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:34,314 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 13:24:34,314 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=217, Unknown=0, NotChecked=0, Total=306 [2020-07-21 13:24:34,314 INFO L87 Difference]: Start difference. First operand 70 states and 122 transitions. Second operand 18 states. [2020-07-21 13:24:34,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:34,725 INFO L93 Difference]: Finished difference Result 120 states and 219 transitions. [2020-07-21 13:24:34,726 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 13:24:34,726 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 327 [2020-07-21 13:24:34,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:34,729 INFO L225 Difference]: With dead ends: 120 [2020-07-21 13:24:34,730 INFO L226 Difference]: Without dead ends: 108 [2020-07-21 13:24:34,733 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 660 GetRequests, 622 SyntacticMatches, 15 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=208, Invalid=392, Unknown=0, NotChecked=0, Total=600 [2020-07-21 13:24:34,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-21 13:24:34,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 90. [2020-07-21 13:24:34,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-07-21 13:24:34,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 167 transitions. [2020-07-21 13:24:34,752 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 167 transitions. Word has length 327 [2020-07-21 13:24:34,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:34,753 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 167 transitions. [2020-07-21 13:24:34,754 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 13:24:34,754 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 167 transitions. [2020-07-21 13:24:34,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 288 [2020-07-21 13:24:34,760 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:34,760 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 34, 20, 20, 20, 20, 20, 20, 20, 14, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:34,976 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:34,976 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:34,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:34,977 INFO L82 PathProgramCache]: Analyzing trace with hash -301446619, now seen corresponding path program 8 times [2020-07-21 13:24:34,977 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:34,977 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [265892528] [2020-07-21 13:24:34,978 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:35,212 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:35,212 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:35,215 INFO L263 TraceCheckSpWp]: Trace formula consists of 638 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 13:24:35,221 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:35,352 INFO L134 CoverageAnalysis]: Checked inductivity of 4601 backedges. 494 proven. 479 refuted. 0 times theorem prover too weak. 3628 trivial. 0 not checked. [2020-07-21 13:24:35,352 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:24:36,246 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:36,247 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:36,405 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:36,406 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:36,502 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:36,549 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:36,576 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:36,595 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:36,681 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:36,864 INFO L134 CoverageAnalysis]: Checked inductivity of 4601 backedges. 500 proven. 505 refuted. 0 times theorem prover too weak. 3596 trivial. 0 not checked. [2020-07-21 13:24:36,864 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [265892528] [2020-07-21 13:24:36,864 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:24:36,865 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 14 [2020-07-21 13:24:36,865 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1799176510] [2020-07-21 13:24:36,866 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 13:24:36,866 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:36,866 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 13:24:36,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2020-07-21 13:24:36,867 INFO L87 Difference]: Start difference. First operand 90 states and 167 transitions. Second operand 14 states. [2020-07-21 13:24:37,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:37,127 INFO L93 Difference]: Finished difference Result 135 states and 267 transitions. [2020-07-21 13:24:37,128 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 13:24:37,128 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 287 [2020-07-21 13:24:37,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:37,132 INFO L225 Difference]: With dead ends: 135 [2020-07-21 13:24:37,133 INFO L226 Difference]: Without dead ends: 123 [2020-07-21 13:24:37,137 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 550 SyntacticMatches, 11 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=120, Invalid=222, Unknown=0, NotChecked=0, Total=342 [2020-07-21 13:24:37,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2020-07-21 13:24:37,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 93. [2020-07-21 13:24:37,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-07-21 13:24:37,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 181 transitions. [2020-07-21 13:24:37,153 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 181 transitions. Word has length 287 [2020-07-21 13:24:37,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:37,154 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 181 transitions. [2020-07-21 13:24:37,154 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 13:24:37,154 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 181 transitions. [2020-07-21 13:24:37,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2020-07-21 13:24:37,160 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:37,160 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 34, 21, 21, 21, 21, 21, 21, 21, 13, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:37,373 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:37,374 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:37,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:37,375 INFO L82 PathProgramCache]: Analyzing trace with hash 1320340794, now seen corresponding path program 9 times [2020-07-21 13:24:37,376 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:37,376 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2127857878] [2020-07-21 13:24:37,376 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:37,586 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:37,587 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:37,589 INFO L263 TraceCheckSpWp]: Trace formula consists of 665 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 13:24:37,594 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:37,728 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 369 proven. 1023 refuted. 0 times theorem prover too weak. 3621 trivial. 0 not checked. [2020-07-21 13:24:37,728 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:24:39,424 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:39,425 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:39,945 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:39,946 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:40,238 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:40,239 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:40,395 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:40,396 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:40,492 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:40,543 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:40,543 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:40,604 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:40,731 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 375 proven. 1074 refuted. 0 times theorem prover too weak. 3564 trivial. 0 not checked. [2020-07-21 13:24:40,735 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2127857878] [2020-07-21 13:24:40,741 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:24:40,742 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 18 [2020-07-21 13:24:40,742 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [266904736] [2020-07-21 13:24:40,744 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 13:24:40,745 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:40,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 13:24:40,746 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=217, Unknown=0, NotChecked=0, Total=306 [2020-07-21 13:24:40,746 INFO L87 Difference]: Start difference. First operand 93 states and 181 transitions. Second operand 18 states. [2020-07-21 13:24:41,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:41,169 INFO L93 Difference]: Finished difference Result 183 states and 362 transitions. [2020-07-21 13:24:41,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 13:24:41,170 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 299 [2020-07-21 13:24:41,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:41,173 INFO L225 Difference]: With dead ends: 183 [2020-07-21 13:24:41,173 INFO L226 Difference]: Without dead ends: 93 [2020-07-21 13:24:41,180 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 604 GetRequests, 566 SyntacticMatches, 15 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=208, Invalid=392, Unknown=0, NotChecked=0, Total=600 [2020-07-21 13:24:41,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-21 13:24:41,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 87. [2020-07-21 13:24:41,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-07-21 13:24:41,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 126 transitions. [2020-07-21 13:24:41,197 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 126 transitions. Word has length 299 [2020-07-21 13:24:41,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:41,198 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 126 transitions. [2020-07-21 13:24:41,198 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 13:24:41,198 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 126 transitions. [2020-07-21 13:24:41,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-21 13:24:41,204 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:41,204 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 33, 20, 20, 20, 20, 20, 20, 20, 13, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:41,417 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:41,418 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:41,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:41,419 INFO L82 PathProgramCache]: Analyzing trace with hash -1425621089, now seen corresponding path program 10 times [2020-07-21 13:24:41,419 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:41,419 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [185950738] [2020-07-21 13:24:41,419 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:41,665 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:41,666 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:41,673 INFO L263 TraceCheckSpWp]: Trace formula consists of 636 conjuncts, 167 conjunts are in the unsatisfiable core [2020-07-21 13:24:41,679 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:42,259 INFO L134 CoverageAnalysis]: Checked inductivity of 4568 backedges. 0 proven. 1500 refuted. 0 times theorem prover too weak. 3068 trivial. 0 not checked. [2020-07-21 13:24:42,260 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:24:45,998 INFO L134 CoverageAnalysis]: Checked inductivity of 4568 backedges. 0 proven. 1500 refuted. 0 times theorem prover too weak. 3068 trivial. 0 not checked. [2020-07-21 13:24:45,999 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [185950738] [2020-07-21 13:24:45,999 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:24:45,999 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 28 [2020-07-21 13:24:45,999 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [94959403] [2020-07-21 13:24:46,000 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-07-21 13:24:46,000 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:46,000 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-07-21 13:24:46,001 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=691, Unknown=0, NotChecked=0, Total=756 [2020-07-21 13:24:46,001 INFO L87 Difference]: Start difference. First operand 87 states and 126 transitions. Second operand 28 states. [2020-07-21 13:24:46,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:46,679 INFO L93 Difference]: Finished difference Result 197 states and 342 transitions. [2020-07-21 13:24:46,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-21 13:24:46,680 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 286 [2020-07-21 13:24:46,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:46,686 INFO L225 Difference]: With dead ends: 197 [2020-07-21 13:24:46,687 INFO L226 Difference]: Without dead ends: 190 [2020-07-21 13:24:46,694 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 573 GetRequests, 534 SyntacticMatches, 11 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 164 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=73, Invalid=797, Unknown=0, NotChecked=0, Total=870 [2020-07-21 13:24:46,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2020-07-21 13:24:46,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 147. [2020-07-21 13:24:46,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2020-07-21 13:24:46,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 267 transitions. [2020-07-21 13:24:46,726 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 267 transitions. Word has length 286 [2020-07-21 13:24:46,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:46,727 INFO L479 AbstractCegarLoop]: Abstraction has 147 states and 267 transitions. [2020-07-21 13:24:46,727 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-07-21 13:24:46,728 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 267 transitions. [2020-07-21 13:24:46,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 324 [2020-07-21 13:24:46,739 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:46,740 INFO L422 BasicCegarLoop]: trace histogram [47, 47, 34, 23, 23, 23, 23, 23, 23, 23, 13, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:46,952 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:46,953 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:46,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:46,953 INFO L82 PathProgramCache]: Analyzing trace with hash -1237982994, now seen corresponding path program 11 times [2020-07-21 13:24:46,953 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:46,953 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [177876517] [2020-07-21 13:24:46,954 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:47,203 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:47,203 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:47,206 INFO L263 TraceCheckSpWp]: Trace formula consists of 719 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 13:24:47,211 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:47,339 INFO L134 CoverageAnalysis]: Checked inductivity of 5897 backedges. 602 proven. 722 refuted. 0 times theorem prover too weak. 4573 trivial. 0 not checked. [2020-07-21 13:24:47,339 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:24:48,857 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:48,858 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:49,143 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:49,143 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:49,350 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:49,351 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:49,456 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:49,457 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:49,506 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:49,540 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:49,608 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:49,814 INFO L134 CoverageAnalysis]: Checked inductivity of 5897 backedges. 610 proven. 756 refuted. 0 times theorem prover too weak. 4531 trivial. 0 not checked. [2020-07-21 13:24:49,815 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [177876517] [2020-07-21 13:24:49,815 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:24:49,815 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 16 [2020-07-21 13:24:49,815 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1748108420] [2020-07-21 13:24:49,816 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 13:24:49,816 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:49,816 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 13:24:49,817 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=169, Unknown=0, NotChecked=0, Total=240 [2020-07-21 13:24:49,817 INFO L87 Difference]: Start difference. First operand 147 states and 267 transitions. Second operand 16 states. [2020-07-21 13:24:50,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:50,075 INFO L93 Difference]: Finished difference Result 196 states and 344 transitions. [2020-07-21 13:24:50,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 13:24:50,076 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 323 [2020-07-21 13:24:50,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:50,080 INFO L225 Difference]: With dead ends: 196 [2020-07-21 13:24:50,080 INFO L226 Difference]: Without dead ends: 184 [2020-07-21 13:24:50,086 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 651 GetRequests, 618 SyntacticMatches, 13 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=161, Invalid=301, Unknown=0, NotChecked=0, Total=462 [2020-07-21 13:24:50,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2020-07-21 13:24:50,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 147. [2020-07-21 13:24:50,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2020-07-21 13:24:50,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 267 transitions. [2020-07-21 13:24:50,115 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 267 transitions. Word has length 323 [2020-07-21 13:24:50,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:50,115 INFO L479 AbstractCegarLoop]: Abstraction has 147 states and 267 transitions. [2020-07-21 13:24:50,116 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 13:24:50,116 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 267 transitions. [2020-07-21 13:24:50,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 348 [2020-07-21 13:24:50,127 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:50,127 INFO L422 BasicCegarLoop]: trace histogram [51, 51, 34, 25, 25, 25, 25, 25, 25, 25, 17, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:50,340 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:50,341 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:50,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:50,342 INFO L82 PathProgramCache]: Analyzing trace with hash -982477528, now seen corresponding path program 12 times [2020-07-21 13:24:50,343 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:50,343 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1962281003] [2020-07-21 13:24:50,343 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:50,607 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:50,608 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:50,610 INFO L263 TraceCheckSpWp]: Trace formula consists of 773 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 13:24:50,614 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:50,792 INFO L134 CoverageAnalysis]: Checked inductivity of 6861 backedges. 700 proven. 736 refuted. 0 times theorem prover too weak. 5425 trivial. 0 not checked. [2020-07-21 13:24:50,793 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:24:52,501 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:52,742 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:52,950 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:52,951 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:53,039 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:53,040 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:53,095 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:53,131 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:53,230 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:53,629 INFO L134 CoverageAnalysis]: Checked inductivity of 6861 backedges. 706 proven. 772 refuted. 0 times theorem prover too weak. 5383 trivial. 0 not checked. [2020-07-21 13:24:53,630 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1962281003] [2020-07-21 13:24:53,630 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:24:53,631 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 16 [2020-07-21 13:24:53,631 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [497744853] [2020-07-21 13:24:53,632 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 13:24:53,633 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:53,633 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 13:24:53,634 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=169, Unknown=0, NotChecked=0, Total=240 [2020-07-21 13:24:53,634 INFO L87 Difference]: Start difference. First operand 147 states and 267 transitions. Second operand 16 states. [2020-07-21 13:24:53,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:53,927 INFO L93 Difference]: Finished difference Result 212 states and 368 transitions. [2020-07-21 13:24:53,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 13:24:53,927 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 347 [2020-07-21 13:24:53,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:53,933 INFO L225 Difference]: With dead ends: 212 [2020-07-21 13:24:53,933 INFO L226 Difference]: Without dead ends: 195 [2020-07-21 13:24:53,940 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 699 GetRequests, 666 SyntacticMatches, 13 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=161, Invalid=301, Unknown=0, NotChecked=0, Total=462 [2020-07-21 13:24:53,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2020-07-21 13:24:53,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 147. [2020-07-21 13:24:53,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2020-07-21 13:24:53,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 267 transitions. [2020-07-21 13:24:53,973 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 267 transitions. Word has length 347 [2020-07-21 13:24:53,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:53,973 INFO L479 AbstractCegarLoop]: Abstraction has 147 states and 267 transitions. [2020-07-21 13:24:53,973 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 13:24:53,974 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 267 transitions. [2020-07-21 13:24:53,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 335 [2020-07-21 13:24:53,984 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:53,984 INFO L422 BasicCegarLoop]: trace histogram [49, 49, 33, 24, 24, 24, 24, 24, 24, 24, 16, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:54,189 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:54,190 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:54,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:54,191 INFO L82 PathProgramCache]: Analyzing trace with hash -974877921, now seen corresponding path program 13 times [2020-07-21 13:24:54,192 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:54,192 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1666978619] [2020-07-21 13:24:54,193 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:54,471 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:54,471 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:54,476 INFO L263 TraceCheckSpWp]: Trace formula consists of 744 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 13:24:54,481 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:54,669 INFO L134 CoverageAnalysis]: Checked inductivity of 6336 backedges. 410 proven. 826 refuted. 0 times theorem prover too weak. 5100 trivial. 0 not checked. [2020-07-21 13:24:54,669 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:24:55,909 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:56,264 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:56,264 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:56,402 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:56,476 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:56,547 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:56,591 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:56,747 INFO L134 CoverageAnalysis]: Checked inductivity of 6336 backedges. 414 proven. 846 refuted. 0 times theorem prover too weak. 5076 trivial. 0 not checked. [2020-07-21 13:24:56,747 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1666978619] [2020-07-21 13:24:56,747 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:24:56,747 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 14] total 16 [2020-07-21 13:24:56,748 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1009701919] [2020-07-21 13:24:56,748 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 13:24:56,748 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:56,749 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 13:24:56,749 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=168, Unknown=0, NotChecked=0, Total=240 [2020-07-21 13:24:56,749 INFO L87 Difference]: Start difference. First operand 147 states and 267 transitions. Second operand 16 states. [2020-07-21 13:24:57,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:57,026 INFO L93 Difference]: Finished difference Result 197 states and 359 transitions. [2020-07-21 13:24:57,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 13:24:57,027 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 334 [2020-07-21 13:24:57,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:57,032 INFO L225 Difference]: With dead ends: 197 [2020-07-21 13:24:57,032 INFO L226 Difference]: Without dead ends: 177 [2020-07-21 13:24:57,038 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 672 GetRequests, 642 SyntacticMatches, 11 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=147, Invalid=273, Unknown=0, NotChecked=0, Total=420 [2020-07-21 13:24:57,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2020-07-21 13:24:57,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 150. [2020-07-21 13:24:57,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2020-07-21 13:24:57,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 270 transitions. [2020-07-21 13:24:57,069 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 270 transitions. Word has length 334 [2020-07-21 13:24:57,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:57,070 INFO L479 AbstractCegarLoop]: Abstraction has 150 states and 270 transitions. [2020-07-21 13:24:57,070 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 13:24:57,070 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 270 transitions. [2020-07-21 13:24:57,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 323 [2020-07-21 13:24:57,081 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:57,082 INFO L422 BasicCegarLoop]: trace histogram [47, 47, 33, 23, 23, 23, 23, 23, 23, 23, 14, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:57,295 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:57,296 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:57,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:57,297 INFO L82 PathProgramCache]: Analyzing trace with hash -1855923328, now seen corresponding path program 14 times [2020-07-21 13:24:57,297 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:57,297 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1300467584] [2020-07-21 13:24:57,298 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:57,607 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:57,608 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:57,613 INFO L263 TraceCheckSpWp]: Trace formula consists of 717 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 13:24:57,618 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:57,788 INFO L134 CoverageAnalysis]: Checked inductivity of 5864 backedges. 548 proven. 638 refuted. 0 times theorem prover too weak. 4678 trivial. 0 not checked. [2020-07-21 13:24:57,788 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:24:59,037 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:59,038 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:59,308 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:59,309 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:59,488 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:59,559 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:59,625 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:59,700 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:59,907 INFO L134 CoverageAnalysis]: Checked inductivity of 5864 backedges. 550 proven. 660 refuted. 0 times theorem prover too weak. 4654 trivial. 0 not checked. [2020-07-21 13:24:59,907 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1300467584] [2020-07-21 13:24:59,907 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:24:59,908 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 14] total 16 [2020-07-21 13:24:59,908 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1342254645] [2020-07-21 13:24:59,908 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 13:24:59,908 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:59,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 13:24:59,909 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=168, Unknown=0, NotChecked=0, Total=240 [2020-07-21 13:24:59,909 INFO L87 Difference]: Start difference. First operand 150 states and 270 transitions. Second operand 16 states. [2020-07-21 13:25:00,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:25:00,148 INFO L93 Difference]: Finished difference Result 207 states and 362 transitions. [2020-07-21 13:25:00,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 13:25:00,152 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 322 [2020-07-21 13:25:00,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:25:00,157 INFO L225 Difference]: With dead ends: 207 [2020-07-21 13:25:00,158 INFO L226 Difference]: Without dead ends: 195 [2020-07-21 13:25:00,164 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 648 GetRequests, 618 SyntacticMatches, 11 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=147, Invalid=273, Unknown=0, NotChecked=0, Total=420 [2020-07-21 13:25:00,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2020-07-21 13:25:00,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 155. [2020-07-21 13:25:00,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 155 states. [2020-07-21 13:25:00,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 280 transitions. [2020-07-21 13:25:00,196 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 280 transitions. Word has length 322 [2020-07-21 13:25:00,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:25:00,197 INFO L479 AbstractCegarLoop]: Abstraction has 155 states and 280 transitions. [2020-07-21 13:25:00,197 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 13:25:00,197 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 280 transitions. [2020-07-21 13:25:00,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 324 [2020-07-21 13:25:00,209 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:25:00,209 INFO L422 BasicCegarLoop]: trace histogram [47, 47, 34, 23, 23, 23, 23, 23, 23, 23, 13, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:25:00,423 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:25:00,424 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:25:00,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:25:00,425 INFO L82 PathProgramCache]: Analyzing trace with hash 1044672832, now seen corresponding path program 15 times [2020-07-21 13:25:00,425 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:25:00,425 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [829496356] [2020-07-21 13:25:00,425 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:25:00,723 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:25:00,723 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:25:00,727 INFO L263 TraceCheckSpWp]: Trace formula consists of 719 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 13:25:00,733 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:25:00,883 INFO L134 CoverageAnalysis]: Checked inductivity of 5897 backedges. 731 proven. 793 refuted. 0 times theorem prover too weak. 4373 trivial. 0 not checked. [2020-07-21 13:25:00,883 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:25:02,830 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:03,274 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:03,274 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:03,589 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:03,762 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:03,763 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:03,865 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:03,918 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:03,921 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:04,013 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:04,256 INFO L134 CoverageAnalysis]: Checked inductivity of 5897 backedges. 733 proven. 848 refuted. 0 times theorem prover too weak. 4316 trivial. 0 not checked. [2020-07-21 13:25:04,256 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [829496356] [2020-07-21 13:25:04,256 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:25:04,257 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 18 [2020-07-21 13:25:04,257 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [443789101] [2020-07-21 13:25:04,257 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 13:25:04,258 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:25:04,258 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 13:25:04,258 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=217, Unknown=0, NotChecked=0, Total=306 [2020-07-21 13:25:04,258 INFO L87 Difference]: Start difference. First operand 155 states and 280 transitions. Second operand 18 states. [2020-07-21 13:25:04,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:25:04,647 INFO L93 Difference]: Finished difference Result 194 states and 331 transitions. [2020-07-21 13:25:04,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 13:25:04,648 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 323 [2020-07-21 13:25:04,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:25:04,654 INFO L225 Difference]: With dead ends: 194 [2020-07-21 13:25:04,654 INFO L226 Difference]: Without dead ends: 177 [2020-07-21 13:25:04,659 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 652 GetRequests, 614 SyntacticMatches, 15 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=208, Invalid=392, Unknown=0, NotChecked=0, Total=600 [2020-07-21 13:25:04,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2020-07-21 13:25:04,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 129. [2020-07-21 13:25:04,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2020-07-21 13:25:04,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 230 transitions. [2020-07-21 13:25:04,684 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 230 transitions. Word has length 323 [2020-07-21 13:25:04,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:25:04,685 INFO L479 AbstractCegarLoop]: Abstraction has 129 states and 230 transitions. [2020-07-21 13:25:04,685 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 13:25:04,685 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 230 transitions. [2020-07-21 13:25:04,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 311 [2020-07-21 13:25:04,693 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:25:04,693 INFO L422 BasicCegarLoop]: trace histogram [45, 45, 33, 22, 22, 22, 22, 22, 22, 22, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:25:04,907 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:25:04,908 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:25:04,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:25:04,909 INFO L82 PathProgramCache]: Analyzing trace with hash 96016501, now seen corresponding path program 16 times [2020-07-21 13:25:04,909 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:25:04,909 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1986797464] [2020-07-21 13:25:04,909 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:25:05,212 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:25:05,212 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:25:05,216 INFO L263 TraceCheckSpWp]: Trace formula consists of 690 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 13:25:05,222 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:25:05,419 INFO L134 CoverageAnalysis]: Checked inductivity of 5412 backedges. 367 proven. 966 refuted. 0 times theorem prover too weak. 4079 trivial. 0 not checked. [2020-07-21 13:25:05,420 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:25:07,045 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:07,549 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:07,831 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:07,832 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:07,971 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:07,972 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:08,051 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:08,052 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:08,133 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:08,208 INFO L134 CoverageAnalysis]: Checked inductivity of 5412 backedges. 368 proven. 1000 refuted. 0 times theorem prover too weak. 4044 trivial. 0 not checked. [2020-07-21 13:25:08,208 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1986797464] [2020-07-21 13:25:08,208 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:25:08,208 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 16] total 18 [2020-07-21 13:25:08,209 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1368320354] [2020-07-21 13:25:08,209 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 13:25:08,209 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:25:08,210 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 13:25:08,210 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2020-07-21 13:25:08,210 INFO L87 Difference]: Start difference. First operand 129 states and 230 transitions. Second operand 18 states. [2020-07-21 13:25:08,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:25:08,561 INFO L93 Difference]: Finished difference Result 227 states and 403 transitions. [2020-07-21 13:25:08,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 13:25:08,562 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 310 [2020-07-21 13:25:08,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:25:08,566 INFO L225 Difference]: With dead ends: 227 [2020-07-21 13:25:08,566 INFO L226 Difference]: Without dead ends: 129 [2020-07-21 13:25:08,571 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 625 GetRequests, 590 SyntacticMatches, 13 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=192, Invalid=360, Unknown=0, NotChecked=0, Total=552 [2020-07-21 13:25:08,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2020-07-21 13:25:08,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 129. [2020-07-21 13:25:08,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2020-07-21 13:25:08,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 213 transitions. [2020-07-21 13:25:08,590 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 213 transitions. Word has length 310 [2020-07-21 13:25:08,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:25:08,590 INFO L479 AbstractCegarLoop]: Abstraction has 129 states and 213 transitions. [2020-07-21 13:25:08,591 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 13:25:08,591 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 213 transitions. [2020-07-21 13:25:08,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 299 [2020-07-21 13:25:08,598 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:25:08,598 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 33, 21, 21, 21, 21, 21, 21, 21, 12, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:25:08,811 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:25:08,812 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:25:08,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:25:08,813 INFO L82 PathProgramCache]: Analyzing trace with hash -606289430, now seen corresponding path program 17 times [2020-07-21 13:25:08,813 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:25:08,814 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [108683172] [2020-07-21 13:25:08,814 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:25:09,117 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:25:09,117 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:25:09,120 INFO L263 TraceCheckSpWp]: Trace formula consists of 663 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 13:25:09,124 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:25:09,337 INFO L134 CoverageAnalysis]: Checked inductivity of 4980 backedges. 614 proven. 659 refuted. 0 times theorem prover too weak. 3707 trivial. 0 not checked. [2020-07-21 13:25:09,337 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:25:10,949 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:11,254 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:11,476 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:11,476 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:11,607 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:11,608 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:11,684 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:11,685 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:11,802 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:12,030 INFO L134 CoverageAnalysis]: Checked inductivity of 4980 backedges. 611 proven. 697 refuted. 0 times theorem prover too weak. 3672 trivial. 0 not checked. [2020-07-21 13:25:12,031 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [108683172] [2020-07-21 13:25:12,031 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:25:12,031 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 16] total 18 [2020-07-21 13:25:12,031 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [915654378] [2020-07-21 13:25:12,032 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 13:25:12,032 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:25:12,032 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 13:25:12,032 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2020-07-21 13:25:12,032 INFO L87 Difference]: Start difference. First operand 129 states and 213 transitions. Second operand 18 states. [2020-07-21 13:25:12,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:25:12,347 INFO L93 Difference]: Finished difference Result 168 states and 265 transitions. [2020-07-21 13:25:12,348 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 13:25:12,348 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 298 [2020-07-21 13:25:12,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:25:12,352 INFO L225 Difference]: With dead ends: 168 [2020-07-21 13:25:12,352 INFO L226 Difference]: Without dead ends: 156 [2020-07-21 13:25:12,357 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 601 GetRequests, 566 SyntacticMatches, 13 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=192, Invalid=360, Unknown=0, NotChecked=0, Total=552 [2020-07-21 13:25:12,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2020-07-21 13:25:12,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 124. [2020-07-21 13:25:12,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2020-07-21 13:25:12,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 202 transitions. [2020-07-21 13:25:12,377 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 202 transitions. Word has length 298 [2020-07-21 13:25:12,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:25:12,378 INFO L479 AbstractCegarLoop]: Abstraction has 124 states and 202 transitions. [2020-07-21 13:25:12,378 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 13:25:12,378 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 202 transitions. [2020-07-21 13:25:12,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 299 [2020-07-21 13:25:12,384 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:25:12,384 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 33, 21, 21, 21, 21, 21, 21, 21, 12, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:25:12,598 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:25:12,599 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:25:12,599 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:25:12,599 INFO L82 PathProgramCache]: Analyzing trace with hash -1063222156, now seen corresponding path program 18 times [2020-07-21 13:25:12,599 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:25:12,600 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1487986808] [2020-07-21 13:25:12,600 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:25:12,919 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:25:12,920 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:25:12,923 INFO L263 TraceCheckSpWp]: Trace formula consists of 663 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 13:25:12,929 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:25:13,104 INFO L134 CoverageAnalysis]: Checked inductivity of 4980 backedges. 934 proven. 152 refuted. 0 times theorem prover too weak. 3894 trivial. 0 not checked. [2020-07-21 13:25:13,104 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:25:14,049 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:14,291 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:14,292 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:14,438 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:14,439 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:14,515 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:14,516 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:14,610 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:14,790 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:15,139 INFO L134 CoverageAnalysis]: Checked inductivity of 4980 backedges. 930 proven. 180 refuted. 0 times theorem prover too weak. 3870 trivial. 0 not checked. [2020-07-21 13:25:15,140 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1487986808] [2020-07-21 13:25:15,140 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:25:15,140 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 14] total 16 [2020-07-21 13:25:15,140 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1996903285] [2020-07-21 13:25:15,141 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 13:25:15,141 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:25:15,141 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 13:25:15,141 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=168, Unknown=0, NotChecked=0, Total=240 [2020-07-21 13:25:15,141 INFO L87 Difference]: Start difference. First operand 124 states and 202 transitions. Second operand 16 states. [2020-07-21 13:25:15,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:25:15,390 INFO L93 Difference]: Finished difference Result 148 states and 228 transitions. [2020-07-21 13:25:15,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 13:25:15,392 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 298 [2020-07-21 13:25:15,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:25:15,395 INFO L225 Difference]: With dead ends: 148 [2020-07-21 13:25:15,396 INFO L226 Difference]: Without dead ends: 141 [2020-07-21 13:25:15,398 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 600 GetRequests, 570 SyntacticMatches, 11 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=147, Invalid=273, Unknown=0, NotChecked=0, Total=420 [2020-07-21 13:25:15,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2020-07-21 13:25:15,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 124. [2020-07-21 13:25:15,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2020-07-21 13:25:15,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 202 transitions. [2020-07-21 13:25:15,416 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 202 transitions. Word has length 298 [2020-07-21 13:25:15,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:25:15,417 INFO L479 AbstractCegarLoop]: Abstraction has 124 states and 202 transitions. [2020-07-21 13:25:15,417 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 13:25:15,417 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 202 transitions. [2020-07-21 13:25:15,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 299 [2020-07-21 13:25:15,423 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:25:15,423 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 33, 21, 21, 21, 21, 21, 21, 21, 12, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:25:15,637 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:25:15,638 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:25:15,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:25:15,639 INFO L82 PathProgramCache]: Analyzing trace with hash 476971754, now seen corresponding path program 19 times [2020-07-21 13:25:15,639 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:25:15,639 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [562451390] [2020-07-21 13:25:15,640 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:25:15,988 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:25:15,988 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:25:15,991 INFO L263 TraceCheckSpWp]: Trace formula consists of 663 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 13:25:15,995 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:25:16,116 INFO L134 CoverageAnalysis]: Checked inductivity of 4980 backedges. 814 proven. 272 refuted. 0 times theorem prover too weak. 3894 trivial. 0 not checked. [2020-07-21 13:25:16,116 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:25:16,908 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:16,909 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:17,150 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:17,151 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:17,292 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:17,356 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:17,357 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:17,427 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:17,532 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:17,978 INFO L134 CoverageAnalysis]: Checked inductivity of 4980 backedges. 814 proven. 296 refuted. 0 times theorem prover too weak. 3870 trivial. 0 not checked. [2020-07-21 13:25:17,979 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [562451390] [2020-07-21 13:25:17,979 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:25:17,979 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 14] total 16 [2020-07-21 13:25:17,979 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1364147630] [2020-07-21 13:25:17,980 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 13:25:17,980 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:25:17,980 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 13:25:17,981 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=168, Unknown=0, NotChecked=0, Total=240 [2020-07-21 13:25:17,981 INFO L87 Difference]: Start difference. First operand 124 states and 202 transitions. Second operand 16 states. [2020-07-21 13:25:18,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:25:18,191 INFO L93 Difference]: Finished difference Result 196 states and 321 transitions. [2020-07-21 13:25:18,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 13:25:18,192 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 298 [2020-07-21 13:25:18,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:25:18,196 INFO L225 Difference]: With dead ends: 196 [2020-07-21 13:25:18,196 INFO L226 Difference]: Without dead ends: 189 [2020-07-21 13:25:18,200 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 600 GetRequests, 570 SyntacticMatches, 11 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=147, Invalid=273, Unknown=0, NotChecked=0, Total=420 [2020-07-21 13:25:18,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2020-07-21 13:25:18,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 121. [2020-07-21 13:25:18,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2020-07-21 13:25:18,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 199 transitions. [2020-07-21 13:25:18,217 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 199 transitions. Word has length 298 [2020-07-21 13:25:18,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:25:18,217 INFO L479 AbstractCegarLoop]: Abstraction has 121 states and 199 transitions. [2020-07-21 13:25:18,217 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 13:25:18,218 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 199 transitions. [2020-07-21 13:25:18,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 299 [2020-07-21 13:25:18,222 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:25:18,222 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 33, 21, 21, 21, 21, 21, 21, 21, 12, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:25:18,436 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:25:18,437 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:25:18,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:25:18,437 INFO L82 PathProgramCache]: Analyzing trace with hash 264460084, now seen corresponding path program 20 times [2020-07-21 13:25:18,438 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:25:18,438 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [511174747] [2020-07-21 13:25:18,438 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:25:18,765 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:25:18,765 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:25:18,767 INFO L263 TraceCheckSpWp]: Trace formula consists of 663 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 13:25:18,770 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:25:18,910 INFO L134 CoverageAnalysis]: Checked inductivity of 4980 backedges. 441 proven. 832 refuted. 0 times theorem prover too weak. 3707 trivial. 0 not checked. [2020-07-21 13:25:18,911 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:25:20,344 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:20,345 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:20,752 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:20,939 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:21,053 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:21,054 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:21,121 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:21,122 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:21,206 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:21,336 INFO L134 CoverageAnalysis]: Checked inductivity of 4980 backedges. 440 proven. 868 refuted. 0 times theorem prover too weak. 3672 trivial. 0 not checked. [2020-07-21 13:25:21,336 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [511174747] [2020-07-21 13:25:21,337 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:25:21,337 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 16] total 18 [2020-07-21 13:25:21,337 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1724352356] [2020-07-21 13:25:21,337 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 13:25:21,337 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:25:21,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 13:25:21,338 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2020-07-21 13:25:21,338 INFO L87 Difference]: Start difference. First operand 121 states and 199 transitions. Second operand 18 states. [2020-07-21 13:25:21,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:25:21,583 INFO L93 Difference]: Finished difference Result 147 states and 227 transitions. [2020-07-21 13:25:21,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 13:25:21,584 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 298 [2020-07-21 13:25:21,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:25:21,587 INFO L225 Difference]: With dead ends: 147 [2020-07-21 13:25:21,587 INFO L226 Difference]: Without dead ends: 130 [2020-07-21 13:25:21,589 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 601 GetRequests, 566 SyntacticMatches, 13 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=192, Invalid=360, Unknown=0, NotChecked=0, Total=552 [2020-07-21 13:25:21,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2020-07-21 13:25:21,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 121. [2020-07-21 13:25:21,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2020-07-21 13:25:21,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 195 transitions. [2020-07-21 13:25:21,604 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 195 transitions. Word has length 298 [2020-07-21 13:25:21,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:25:21,604 INFO L479 AbstractCegarLoop]: Abstraction has 121 states and 195 transitions. [2020-07-21 13:25:21,604 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 13:25:21,604 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 195 transitions. [2020-07-21 13:25:21,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 299 [2020-07-21 13:25:21,609 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:25:21,609 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 33, 21, 21, 21, 21, 21, 21, 21, 12, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:25:21,824 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:25:21,825 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:25:21,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:25:21,826 INFO L82 PathProgramCache]: Analyzing trace with hash -1448945942, now seen corresponding path program 21 times [2020-07-21 13:25:21,826 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:25:21,826 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1527688707] [2020-07-21 13:25:21,827 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:25:22,261 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:25:22,261 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:25:22,264 INFO L263 TraceCheckSpWp]: Trace formula consists of 663 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 13:25:22,269 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:25:22,411 INFO L134 CoverageAnalysis]: Checked inductivity of 4980 backedges. 960 proven. 313 refuted. 0 times theorem prover too weak. 3707 trivial. 0 not checked. [2020-07-21 13:25:22,412 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:25:23,581 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:23,911 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:24,126 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:24,127 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:24,251 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:24,321 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:24,474 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:24,823 INFO L134 CoverageAnalysis]: Checked inductivity of 4980 backedges. 955 proven. 353 refuted. 0 times theorem prover too weak. 3672 trivial. 0 not checked. [2020-07-21 13:25:24,823 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1527688707] [2020-07-21 13:25:24,823 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:25:24,823 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 16] total 18 [2020-07-21 13:25:24,823 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [421346969] [2020-07-21 13:25:24,824 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 13:25:24,824 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:25:24,824 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 13:25:24,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2020-07-21 13:25:24,825 INFO L87 Difference]: Start difference. First operand 121 states and 195 transitions. Second operand 18 states. [2020-07-21 13:25:25,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:25:25,108 INFO L93 Difference]: Finished difference Result 181 states and 282 transitions. [2020-07-21 13:25:25,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 13:25:25,108 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 298 [2020-07-21 13:25:25,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:25:25,111 INFO L225 Difference]: With dead ends: 181 [2020-07-21 13:25:25,112 INFO L226 Difference]: Without dead ends: 164 [2020-07-21 13:25:25,118 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 601 GetRequests, 566 SyntacticMatches, 13 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=192, Invalid=360, Unknown=0, NotChecked=0, Total=552 [2020-07-21 13:25:25,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2020-07-21 13:25:25,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 81. [2020-07-21 13:25:25,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-07-21 13:25:25,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 125 transitions. [2020-07-21 13:25:25,130 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 125 transitions. Word has length 298 [2020-07-21 13:25:25,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:25:25,130 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 125 transitions. [2020-07-21 13:25:25,131 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 13:25:25,131 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 125 transitions. [2020-07-21 13:25:25,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 288 [2020-07-21 13:25:25,134 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:25:25,134 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 34, 20, 20, 20, 20, 20, 20, 20, 14, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:25:25,347 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:25:25,348 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:25:25,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:25:25,349 INFO L82 PathProgramCache]: Analyzing trace with hash -258866501, now seen corresponding path program 22 times [2020-07-21 13:25:25,349 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:25:25,349 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1605890537] [2020-07-21 13:25:25,350 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:25:25,741 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:25:25,742 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:25:25,744 INFO L263 TraceCheckSpWp]: Trace formula consists of 638 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 13:25:25,746 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:25:25,871 INFO L134 CoverageAnalysis]: Checked inductivity of 4601 backedges. 270 proven. 1056 refuted. 0 times theorem prover too weak. 3275 trivial. 0 not checked. [2020-07-21 13:25:25,871 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:25:27,472 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:27,473 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:27,941 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:28,249 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:28,417 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:28,418 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:28,511 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:28,557 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:28,584 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:28,632 INFO L134 CoverageAnalysis]: Checked inductivity of 4601 backedges. 280 proven. 1103 refuted. 0 times theorem prover too weak. 3218 trivial. 0 not checked. [2020-07-21 13:25:28,633 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1605890537] [2020-07-21 13:25:28,633 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:25:28,633 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 18 [2020-07-21 13:25:28,633 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1354706776] [2020-07-21 13:25:28,634 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 13:25:28,634 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:25:28,634 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 13:25:28,634 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=217, Unknown=0, NotChecked=0, Total=306 [2020-07-21 13:25:28,634 INFO L87 Difference]: Start difference. First operand 81 states and 125 transitions. Second operand 18 states. [2020-07-21 13:25:28,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:25:28,939 INFO L93 Difference]: Finished difference Result 180 states and 281 transitions. [2020-07-21 13:25:28,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 13:25:28,940 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 287 [2020-07-21 13:25:28,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:25:28,942 INFO L225 Difference]: With dead ends: 180 [2020-07-21 13:25:28,942 INFO L226 Difference]: Without dead ends: 78 [2020-07-21 13:25:28,945 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 580 GetRequests, 542 SyntacticMatches, 15 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=208, Invalid=392, Unknown=0, NotChecked=0, Total=600 [2020-07-21 13:25:28,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-21 13:25:28,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2020-07-21 13:25:28,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-07-21 13:25:28,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 96 transitions. [2020-07-21 13:25:28,953 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 96 transitions. Word has length 287 [2020-07-21 13:25:28,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:25:28,953 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 96 transitions. [2020-07-21 13:25:28,953 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 13:25:28,953 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 96 transitions. [2020-07-21 13:25:28,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 299 [2020-07-21 13:25:28,956 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:25:28,956 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 33, 21, 21, 21, 21, 21, 21, 21, 12, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:25:29,170 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:25:29,171 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:25:29,171 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:25:29,172 INFO L82 PathProgramCache]: Analyzing trace with hash -551621334, now seen corresponding path program 23 times [2020-07-21 13:25:29,172 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:25:29,172 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1027010442] [2020-07-21 13:25:29,172 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:25:29,533 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:25:29,534 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:25:29,535 INFO L263 TraceCheckSpWp]: Trace formula consists of 663 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 13:25:29,539 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:25:29,680 INFO L134 CoverageAnalysis]: Checked inductivity of 4980 backedges. 321 proven. 952 refuted. 0 times theorem prover too weak. 3707 trivial. 0 not checked. [2020-07-21 13:25:29,680 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:25:31,095 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:31,095 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:31,535 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:31,536 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:31,776 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:31,777 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:31,919 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:31,982 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:32,044 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:32,103 INFO L134 CoverageAnalysis]: Checked inductivity of 4980 backedges. 324 proven. 984 refuted. 0 times theorem prover too weak. 3672 trivial. 0 not checked. [2020-07-21 13:25:32,104 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1027010442] [2020-07-21 13:25:32,104 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:25:32,104 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 16] total 18 [2020-07-21 13:25:32,104 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [470478339] [2020-07-21 13:25:32,105 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 13:25:32,105 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:25:32,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 13:25:32,106 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2020-07-21 13:25:32,106 INFO L87 Difference]: Start difference. First operand 78 states and 96 transitions. Second operand 18 states. [2020-07-21 13:25:32,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:25:32,337 INFO L93 Difference]: Finished difference Result 105 states and 126 transitions. [2020-07-21 13:25:32,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 13:25:32,338 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 298 [2020-07-21 13:25:32,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:25:32,340 INFO L225 Difference]: With dead ends: 105 [2020-07-21 13:25:32,340 INFO L226 Difference]: Without dead ends: 73 [2020-07-21 13:25:32,341 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 601 GetRequests, 566 SyntacticMatches, 13 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=192, Invalid=360, Unknown=0, NotChecked=0, Total=552 [2020-07-21 13:25:32,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-21 13:25:32,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2020-07-21 13:25:32,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-07-21 13:25:32,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 85 transitions. [2020-07-21 13:25:32,350 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 85 transitions. Word has length 298 [2020-07-21 13:25:32,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:25:32,351 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 85 transitions. [2020-07-21 13:25:32,351 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 13:25:32,351 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 85 transitions. [2020-07-21 13:25:32,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 299 [2020-07-21 13:25:32,353 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:25:32,354 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 33, 21, 21, 21, 21, 21, 21, 21, 12, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:25:32,567 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:25:32,568 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:25:32,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:25:32,569 INFO L82 PathProgramCache]: Analyzing trace with hash -2133540566, now seen corresponding path program 24 times [2020-07-21 13:25:32,569 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:25:32,569 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [954332237] [2020-07-21 13:25:32,569 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:25:32,924 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:25:32,924 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:25:32,926 INFO L263 TraceCheckSpWp]: Trace formula consists of 663 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-21 13:25:32,928 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:25:33,112 INFO L134 CoverageAnalysis]: Checked inductivity of 4980 backedges. 328 proven. 1119 refuted. 0 times theorem prover too weak. 3533 trivial. 0 not checked. [2020-07-21 13:25:33,113 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:25:34,985 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:34,986 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:35,530 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:35,864 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:36,073 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:36,074 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:36,196 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:36,197 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:36,267 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:36,268 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:25:36,371 INFO L134 CoverageAnalysis]: Checked inductivity of 4980 backedges. 322 proven. 1176 refuted. 0 times theorem prover too weak. 3482 trivial. 0 not checked. [2020-07-21 13:25:36,372 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [954332237] [2020-07-21 13:25:36,372 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:25:36,372 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 18] total 20 [2020-07-21 13:25:36,373 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [653034294] [2020-07-21 13:25:36,373 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 13:25:36,373 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:25:36,373 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 13:25:36,374 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=270, Unknown=0, NotChecked=0, Total=380 [2020-07-21 13:25:36,374 INFO L87 Difference]: Start difference. First operand 73 states and 85 transitions. Second operand 20 states. [2020-07-21 13:25:36,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:25:36,679 INFO L93 Difference]: Finished difference Result 138 states and 164 transitions. [2020-07-21 13:25:36,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 13:25:36,680 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 298 [2020-07-21 13:25:36,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:25:36,682 INFO L225 Difference]: With dead ends: 138 [2020-07-21 13:25:36,682 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 13:25:36,689 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 602 GetRequests, 562 SyntacticMatches, 15 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 167 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=243, Invalid=459, Unknown=0, NotChecked=0, Total=702 [2020-07-21 13:25:36,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 13:25:36,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 13:25:36,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 13:25:36,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 13:25:36,690 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 298 [2020-07-21 13:25:36,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:25:36,691 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 13:25:36,692 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 13:25:36,692 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 13:25:36,692 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 13:25:36,901 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:25:36,905 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 13:25:38,649 WARN L193 SmtUtils]: Spent 1.68 s on a formula simplification. DAG size of input: 293 DAG size of output: 157 [2020-07-21 13:25:40,036 WARN L193 SmtUtils]: Spent 1.38 s on a formula simplification. DAG size of input: 358 DAG size of output: 187 [2020-07-21 13:25:40,889 WARN L193 SmtUtils]: Spent 850.00 ms on a formula simplification. DAG size of input: 325 DAG size of output: 174 [2020-07-21 13:25:41,681 WARN L193 SmtUtils]: Spent 790.00 ms on a formula simplification. DAG size of input: 325 DAG size of output: 174 [2020-07-21 13:25:43,318 WARN L193 SmtUtils]: Spent 1.64 s on a formula simplification. DAG size of input: 402 DAG size of output: 210 [2020-07-21 13:25:44,943 WARN L193 SmtUtils]: Spent 1.62 s on a formula simplification. DAG size of input: 402 DAG size of output: 210 [2020-07-21 13:25:45,699 WARN L193 SmtUtils]: Spent 753.00 ms on a formula simplification. DAG size of input: 325 DAG size of output: 174 [2020-07-21 13:25:46,907 WARN L193 SmtUtils]: Spent 1.21 s on a formula simplification. DAG size of input: 369 DAG size of output: 198 [2020-07-21 13:25:47,244 WARN L193 SmtUtils]: Spent 334.00 ms on a formula simplification. DAG size of input: 246 DAG size of output: 118 [2020-07-21 13:25:48,954 WARN L193 SmtUtils]: Spent 1.71 s on a formula simplification. DAG size of input: 402 DAG size of output: 210 [2020-07-21 13:25:49,302 WARN L193 SmtUtils]: Spent 345.00 ms on a formula simplification. DAG size of input: 246 DAG size of output: 118 [2020-07-21 13:25:50,013 WARN L193 SmtUtils]: Spent 710.00 ms on a formula simplification. DAG size of input: 320 DAG size of output: 168 [2020-07-21 13:25:51,569 WARN L193 SmtUtils]: Spent 1.55 s on a formula simplification. DAG size of input: 428 DAG size of output: 121 [2020-07-21 13:25:53,129 WARN L193 SmtUtils]: Spent 1.56 s on a formula simplification. DAG size of input: 402 DAG size of output: 210 [2020-07-21 13:25:53,615 WARN L193 SmtUtils]: Spent 484.00 ms on a formula simplification. DAG size of input: 350 DAG size of output: 189 [2020-07-21 13:25:55,426 WARN L193 SmtUtils]: Spent 1.81 s on a formula simplification. DAG size of input: 421 DAG size of output: 214 [2020-07-21 13:25:55,676 WARN L193 SmtUtils]: Spent 247.00 ms on a formula simplification. DAG size of input: 225 DAG size of output: 105 [2020-07-21 13:25:57,446 WARN L193 SmtUtils]: Spent 1.77 s on a formula simplification. DAG size of input: 421 DAG size of output: 214 [2020-07-21 13:25:58,122 WARN L193 SmtUtils]: Spent 674.00 ms on a formula simplification. DAG size of input: 307 DAG size of output: 171 [2020-07-21 13:25:58,856 WARN L193 SmtUtils]: Spent 731.00 ms on a formula simplification. DAG size of input: 320 DAG size of output: 168 [2020-07-21 13:25:59,010 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 73 [2020-07-21 13:26:00,566 WARN L193 SmtUtils]: Spent 1.55 s on a formula simplification. DAG size of input: 402 DAG size of output: 210 [2020-07-21 13:26:01,232 WARN L193 SmtUtils]: Spent 663.00 ms on a formula simplification. DAG size of input: 307 DAG size of output: 171 [2020-07-21 13:26:03,035 WARN L193 SmtUtils]: Spent 1.80 s on a formula simplification. DAG size of input: 421 DAG size of output: 214 [2020-07-21 13:26:04,643 WARN L193 SmtUtils]: Spent 1.61 s on a formula simplification. DAG size of input: 402 DAG size of output: 210 [2020-07-21 13:26:05,442 WARN L193 SmtUtils]: Spent 797.00 ms on a formula simplification. DAG size of input: 330 DAG size of output: 177 [2020-07-21 13:26:07,226 WARN L193 SmtUtils]: Spent 1.78 s on a formula simplification. DAG size of input: 421 DAG size of output: 214 [2020-07-21 13:26:07,368 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 73 [2020-07-21 13:26:08,879 WARN L193 SmtUtils]: Spent 1.51 s on a formula simplification. DAG size of input: 402 DAG size of output: 210 [2020-07-21 13:26:10,617 WARN L193 SmtUtils]: Spent 1.73 s on a formula simplification. DAG size of input: 421 DAG size of output: 214 [2020-07-21 13:26:12,143 WARN L193 SmtUtils]: Spent 1.52 s on a formula simplification. DAG size of input: 402 DAG size of output: 210 [2020-07-21 13:26:13,875 WARN L193 SmtUtils]: Spent 1.73 s on a formula simplification. DAG size of input: 421 DAG size of output: 214 [2020-07-21 13:26:14,022 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 73 [2020-07-21 13:26:15,626 WARN L193 SmtUtils]: Spent 1.60 s on a formula simplification. DAG size of input: 409 DAG size of output: 212 [2020-07-21 13:26:17,365 WARN L193 SmtUtils]: Spent 1.74 s on a formula simplification. DAG size of input: 421 DAG size of output: 214 [2020-07-21 13:26:18,856 WARN L193 SmtUtils]: Spent 1.49 s on a formula simplification. DAG size of input: 397 DAG size of output: 210 [2020-07-21 13:26:20,617 WARN L193 SmtUtils]: Spent 1.76 s on a formula simplification. DAG size of input: 421 DAG size of output: 214 [2020-07-21 13:26:22,198 WARN L193 SmtUtils]: Spent 1.58 s on a formula simplification. DAG size of input: 402 DAG size of output: 210 [2020-07-21 13:26:23,993 WARN L193 SmtUtils]: Spent 1.79 s on a formula simplification. DAG size of input: 421 DAG size of output: 214 [2020-07-21 13:26:24,099 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 60 [2020-07-21 13:26:24,242 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 73 [2020-07-21 13:26:25,816 WARN L193 SmtUtils]: Spent 1.57 s on a formula simplification. DAG size of input: 402 DAG size of output: 210 [2020-07-21 13:26:27,662 WARN L193 SmtUtils]: Spent 1.84 s on a formula simplification. DAG size of input: 421 DAG size of output: 214 [2020-07-21 13:26:29,514 WARN L193 SmtUtils]: Spent 1.80 s on a formula simplification. DAG size of input: 409 DAG size of output: 212 [2020-07-21 13:26:29,658 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 73 [2020-07-21 13:26:31,496 WARN L193 SmtUtils]: Spent 1.79 s on a formula simplification. DAG size of input: 416 DAG size of output: 214 [2020-07-21 13:26:33,009 WARN L193 SmtUtils]: Spent 1.51 s on a formula simplification. DAG size of input: 397 DAG size of output: 210 [2020-07-21 13:26:33,148 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 73 [2020-07-21 13:26:34,938 WARN L193 SmtUtils]: Spent 1.79 s on a formula simplification. DAG size of input: 421 DAG size of output: 214 [2020-07-21 13:26:35,080 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 73 [2020-07-21 13:26:36,308 WARN L193 SmtUtils]: Spent 1.22 s on a formula simplification. DAG size of input: 369 DAG size of output: 189 [2020-07-21 13:26:37,902 WARN L193 SmtUtils]: Spent 1.59 s on a formula simplification. DAG size of input: 397 DAG size of output: 210 [2020-07-21 13:26:39,717 WARN L193 SmtUtils]: Spent 1.81 s on a formula simplification. DAG size of input: 421 DAG size of output: 214 [2020-07-21 13:26:41,389 WARN L193 SmtUtils]: Spent 1.61 s on a formula simplification. DAG size of input: 404 DAG size of output: 212 [2020-07-21 13:26:43,249 WARN L193 SmtUtils]: Spent 1.81 s on a formula simplification. DAG size of input: 416 DAG size of output: 214 [2020-07-21 13:26:44,680 WARN L193 SmtUtils]: Spent 1.43 s on a formula simplification. DAG size of input: 392 DAG size of output: 203 [2020-07-21 13:26:44,864 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 73 [2020-07-21 13:26:45,325 WARN L193 SmtUtils]: Spent 459.00 ms on a formula simplification. DAG size of input: 270 DAG size of output: 135 [2020-07-21 13:26:47,052 WARN L193 SmtUtils]: Spent 1.73 s on a formula simplification. DAG size of input: 421 DAG size of output: 214 [2020-07-21 13:26:48,332 WARN L193 SmtUtils]: Spent 1.28 s on a formula simplification. DAG size of input: 379 DAG size of output: 200 [2020-07-21 13:26:49,081 WARN L193 SmtUtils]: Spent 748.00 ms on a formula simplification. DAG size of input: 329 DAG size of output: 174 [2020-07-21 13:26:49,850 WARN L193 SmtUtils]: Spent 766.00 ms on a formula simplification. DAG size of input: 329 DAG size of output: 174 [2020-07-21 13:26:51,365 WARN L193 SmtUtils]: Spent 1.51 s on a formula simplification. DAG size of input: 399 DAG size of output: 205 [2020-07-21 13:26:53,101 WARN L193 SmtUtils]: Spent 1.73 s on a formula simplification. DAG size of input: 421 DAG size of output: 214 [2020-07-21 13:26:54,533 WARN L193 SmtUtils]: Spent 1.43 s on a formula simplification. DAG size of input: 392 DAG size of output: 203 [2020-07-21 13:26:56,265 WARN L193 SmtUtils]: Spent 1.73 s on a formula simplification. DAG size of input: 416 DAG size of output: 214 [2020-07-21 13:26:57,853 WARN L193 SmtUtils]: Spent 1.49 s on a formula simplification. DAG size of input: 402 DAG size of output: 213 [2020-07-21 13:26:59,476 WARN L193 SmtUtils]: Spent 1.62 s on a formula simplification. DAG size of input: 409 DAG size of output: 217 [2020-07-21 13:26:59,620 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 73 [2020-07-21 13:26:59,763 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 73 [2020-07-21 13:27:00,275 WARN L193 SmtUtils]: Spent 511.00 ms on a formula simplification. DAG size of input: 279 DAG size of output: 143 [2020-07-21 13:27:02,048 WARN L193 SmtUtils]: Spent 1.72 s on a formula simplification. DAG size of input: 416 DAG size of output: 214 [2020-07-21 13:27:02,826 WARN L193 SmtUtils]: Spent 776.00 ms on a formula simplification. DAG size of input: 329 DAG size of output: 174 [2020-07-21 13:27:04,572 WARN L193 SmtUtils]: Spent 1.70 s on a formula simplification. DAG size of input: 411 DAG size of output: 207 [2020-07-21 13:27:04,714 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 180 DAG size of output: 71 [2020-07-21 13:27:05,488 WARN L193 SmtUtils]: Spent 772.00 ms on a formula simplification. DAG size of input: 329 DAG size of output: 174 [2020-07-21 13:27:07,187 WARN L193 SmtUtils]: Spent 1.70 s on a formula simplification. DAG size of input: 411 DAG size of output: 207 [2020-07-21 13:27:07,435 WARN L193 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 180 DAG size of output: 71 [2020-07-21 13:27:09,207 WARN L193 SmtUtils]: Spent 1.77 s on a formula simplification. DAG size of input: 421 DAG size of output: 219 [2020-07-21 13:27:09,986 WARN L193 SmtUtils]: Spent 777.00 ms on a formula simplification. DAG size of input: 329 DAG size of output: 174 [2020-07-21 13:27:10,187 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 184 DAG size of output: 73 [2020-07-21 13:27:11,038 WARN L193 SmtUtils]: Spent 849.00 ms on a formula simplification. DAG size of input: 339 DAG size of output: 181 [2020-07-21 13:27:11,863 WARN L193 SmtUtils]: Spent 777.00 ms on a formula simplification. DAG size of input: 329 DAG size of output: 174 [2020-07-21 13:27:12,628 WARN L193 SmtUtils]: Spent 762.00 ms on a formula simplification. DAG size of input: 329 DAG size of output: 174 [2020-07-21 13:27:13,420 WARN L193 SmtUtils]: Spent 790.00 ms on a formula simplification. DAG size of input: 325 DAG size of output: 174 [2020-07-21 13:27:20,883 WARN L193 SmtUtils]: Spent 7.30 s on a formula simplification. DAG size of input: 451 DAG size of output: 42 [2020-07-21 13:27:20,918 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 13:27:20,918 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 13:27:20,918 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 13:27:20,918 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 13:27:20,919 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 13:27:20,919 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 13:27:20,919 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 27) no Hoare annotation was computed. [2020-07-21 13:27:20,919 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 23 30) the Hoare annotation is: true [2020-07-21 13:27:20,919 INFO L268 CegarLoopResult]: For program point L27(line 27) no Hoare annotation was computed. [2020-07-21 13:27:20,919 INFO L268 CegarLoopResult]: For program point L26(lines 26 28) no Hoare annotation was computed. [2020-07-21 13:27:20,919 INFO L264 CegarLoopResult]: At program point L25(line 25) the Hoare annotation is: (and (<= 7 main_~x~0) (<= main_~x~0 7)) [2020-07-21 13:27:20,920 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 23 30) no Hoare annotation was computed. [2020-07-21 13:27:20,920 INFO L268 CegarLoopResult]: For program point L25-1(line 25) no Hoare annotation was computed. [2020-07-21 13:27:20,920 INFO L268 CegarLoopResult]: For program point L26-2(lines 26 28) no Hoare annotation was computed. [2020-07-21 13:27:20,920 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 23 30) no Hoare annotation was computed. [2020-07-21 13:27:20,920 INFO L268 CegarLoopResult]: For program point fiboEXIT(lines 5 13) no Hoare annotation was computed. [2020-07-21 13:27:20,920 INFO L268 CegarLoopResult]: For program point fiboFINAL(lines 5 13) no Hoare annotation was computed. [2020-07-21 13:27:20,920 INFO L264 CegarLoopResult]: At program point L11(line 11) the Hoare annotation is: (and (<= fibo_~n |fibo_#in~n|) (<= |fibo_#in~n| fibo_~n) (<= 2 |fibo_#in~n|)) [2020-07-21 13:27:20,921 INFO L268 CegarLoopResult]: For program point L11-1(line 11) no Hoare annotation was computed. [2020-07-21 13:27:20,921 INFO L264 CegarLoopResult]: At program point L11-2(line 11) the Hoare annotation is: (let ((.cse5 (<= 4 |fibo_#in~n|)) (.cse6 (<= fibo_~n |fibo_#in~n|)) (.cse7 (<= |fibo_#in~n| fibo_~n)) (.cse8 (<= |fibo_#in~n| 3)) (.cse9 (= |fibo_#t~ret0| 1))) (let ((.cse0 (and (= 5 |fibo_#t~ret0|) (<= 6 |fibo_#in~n|))) (.cse2 (and .cse9 (<= |fibo_#in~n| 2) (<= 2 |fibo_#in~n|))) (.cse4 (and .cse9 (<= 3 |fibo_#in~n|) .cse8)) (.cse3 (<= 7 |fibo_#in~n|)) (.cse1 (and .cse5 .cse6 (= |fibo_#t~ret0| 2) .cse7 (<= |fibo_#in~n| 4)))) (and (or .cse0 .cse1 .cse2 .cse3 .cse4 (= |fibo_#t~ret0| 3)) (or .cse0 (and .cse5 (<= |fibo_#in~n| 5)) .cse2 .cse4 .cse3) (or (<= |fibo_#in~n| 6) (<= 8 |fibo_#in~n|) (= |fibo_#t~ret0| 8)) (or .cse1 (and (<= 5 |fibo_#in~n|) .cse6 .cse7) (and .cse6 .cse7 .cse8))))) [2020-07-21 13:27:20,921 INFO L268 CegarLoopResult]: For program point L8(lines 8 12) no Hoare annotation was computed. [2020-07-21 13:27:20,921 INFO L268 CegarLoopResult]: For program point L11-3(line 11) no Hoare annotation was computed. [2020-07-21 13:27:20,921 INFO L268 CegarLoopResult]: For program point L6(lines 6 12) no Hoare annotation was computed. [2020-07-21 13:27:20,921 INFO L271 CegarLoopResult]: At program point fiboENTRY(lines 5 13) the Hoare annotation is: true [2020-07-21 13:27:20,926 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 01:27:20 BoogieIcfgContainer [2020-07-21 13:27:20,926 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 13:27:20,928 INFO L168 Benchmark]: Toolchain (without parser) took 203090.87 ms. Allocated memory was 144.7 MB in the beginning and 1.8 GB in the end (delta: 1.6 GB). Free memory was 102.8 MB in the beginning and 351.8 MB in the end (delta: -249.0 MB). Peak memory consumption was 1.7 GB. Max. memory is 7.1 GB. [2020-07-21 13:27:20,929 INFO L168 Benchmark]: CDTParser took 1.21 ms. Allocated memory is still 144.7 MB. Free memory was 120.9 MB in the beginning and 120.7 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. [2020-07-21 13:27:20,929 INFO L168 Benchmark]: CACSL2BoogieTranslator took 444.62 ms. Allocated memory is still 144.7 MB. Free memory was 102.4 MB in the beginning and 93.2 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. [2020-07-21 13:27:20,929 INFO L168 Benchmark]: Boogie Preprocessor took 74.32 ms. Allocated memory is still 144.7 MB. Free memory was 93.2 MB in the beginning and 91.8 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2020-07-21 13:27:20,930 INFO L168 Benchmark]: RCFGBuilder took 736.65 ms. Allocated memory was 144.7 MB in the beginning and 199.2 MB in the end (delta: 54.5 MB). Free memory was 91.6 MB in the beginning and 167.1 MB in the end (delta: -75.4 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. [2020-07-21 13:27:20,930 INFO L168 Benchmark]: TraceAbstraction took 201820.55 ms. Allocated memory was 199.2 MB in the beginning and 1.8 GB in the end (delta: 1.6 GB). Free memory was 166.4 MB in the beginning and 351.8 MB in the end (delta: -185.4 MB). Peak memory consumption was 1.7 GB. Max. memory is 7.1 GB. [2020-07-21 13:27:20,932 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 1.21 ms. Allocated memory is still 144.7 MB. Free memory was 120.9 MB in the beginning and 120.7 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 444.62 ms. Allocated memory is still 144.7 MB. Free memory was 102.4 MB in the beginning and 93.2 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 74.32 ms. Allocated memory is still 144.7 MB. Free memory was 93.2 MB in the beginning and 91.8 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 736.65 ms. Allocated memory was 144.7 MB in the beginning and 199.2 MB in the end (delta: 54.5 MB). Free memory was 91.6 MB in the beginning and 167.1 MB in the end (delta: -75.4 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 201820.55 ms. Allocated memory was 199.2 MB in the beginning and 1.8 GB in the end (delta: 1.6 GB). Free memory was 166.4 MB in the beginning and 351.8 MB in the end (delta: -185.4 MB). Peak memory consumption was 1.7 GB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 27]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 24 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 97.6s, OverallIterations: 32, TraceHistogramMax: 77, AutomataDifference: 10.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 104.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 857 SDtfs, 1005 SDslu, 3826 SDs, 0 SdLazy, 4568 SolverSat, 1407 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 5.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 15514 GetRequests, 14580 SyntacticMatches, 343 SemanticMatches, 591 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2741 ImplicationChecksByTransitivity, 9.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=155occurred in iteration=22, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.6s AutomataMinimizationTime, 32 MinimizatonAttempts, 680 StatesRemovedByMinimization, 26 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 8 LocationsWithAnnotation, 296 PreInvPairs, 16708 NumberOfFragments, 158 HoareAnnotationTreeSize, 296 FomulaSimplifications, 38842483141 FormulaSimplificationTreeSizeReduction, 96.6s HoareSimplificationTime, 8 FomulaSimplificationsInter, 21083537 FormulaSimplificationTreeSizeReductionInter, 7.3s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.4s SsaConstructionTime, 2.4s SatisfiabilityAnalysisTime, 71.9s InterpolantComputationTime, 7701 NumberOfCodeBlocks, 7701 NumberOfCodeBlocksAsserted, 64 NumberOfCheckSat, 15313 ConstructedInterpolants, 0 QuantifiedInterpolants, 6925401 SizeOfPredicates, 189 NumberOfNonLiveVariables, 17150 ConjunctsInSsa, 555 ConjunctsInUnsatCore, 62 InterpolantComputations, 2 PerfectInterpolantSequences, 229996/271712 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...