/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 BIGGEST_EQUIVALENCE_CLASS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_25-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 22:07:19,084 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 22:07:19,088 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 22:07:19,109 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 22:07:19,110 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 22:07:19,112 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 22:07:19,114 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 22:07:19,127 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 22:07:19,130 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 22:07:19,131 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 22:07:19,132 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 22:07:19,133 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 22:07:19,133 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 22:07:19,134 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 22:07:19,135 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 22:07:19,136 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 22:07:19,137 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 22:07:19,138 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 22:07:19,139 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 22:07:19,141 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 22:07:19,143 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 22:07:19,144 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 22:07:19,145 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 22:07:19,146 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 22:07:19,148 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-21 22:07:19,148 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-21 22:07:19,149 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-21 22:07:19,149 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-21 22:07:19,150 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-21 22:07:19,151 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-21 22:07:19,151 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-21 22:07:19,152 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-21 22:07:19,153 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-21 22:07:19,153 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-21 22:07:19,154 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-21 22:07:19,154 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-21 22:07:19,155 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-21 22:07:19,156 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-21 22:07:19,156 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 22:07:19,157 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 22:07:19,158 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 22:07:19,159 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 22:07:19,174 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 22:07:19,174 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 22:07:19,175 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 22:07:19,176 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 22:07:19,176 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 22:07:19,176 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 22:07:19,176 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 22:07:19,177 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 22:07:19,177 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 22:07:19,177 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 22:07:19,177 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 22:07:19,177 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 22:07:19,178 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 22:07:19,178 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 22:07:19,178 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 22:07:19,178 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 22:07:19,178 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 22:07:19,179 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 22:07:19,179 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 22:07:19,179 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 22:07:19,179 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 22:07:19,179 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 22:07:19,180 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 22:07:19,180 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 22:07:19,180 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 22:07:19,180 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 22:07:19,181 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:07:19,181 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 22:07:19,181 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 22:07:19,181 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 -> BIGGEST_EQUIVALENCE_CLASS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-21 22:07:19,511 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 22:07:19,530 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 22:07:19,533 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 22:07:19,534 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 22:07:19,534 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 22:07:19,535 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_25-1.c [2020-07-21 22:07:19,623 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/34de6cf82/a067128d329d40d3aaaf75cb03cf31fd/FLAGf945cf633 [2020-07-21 22:07:20,115 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 22:07:20,116 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_25-1.c [2020-07-21 22:07:20,121 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/34de6cf82/a067128d329d40d3aaaf75cb03cf31fd/FLAGf945cf633 [2020-07-21 22:07:20,471 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/34de6cf82/a067128d329d40d3aaaf75cb03cf31fd [2020-07-21 22:07:20,484 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 22:07:20,487 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 22:07:20,488 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 22:07:20,488 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 22:07:20,492 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 22:07:20,493 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:07:20" (1/1) ... [2020-07-21 22:07:20,496 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5a6ce331 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:07:20, skipping insertion in model container [2020-07-21 22:07:20,497 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:07:20" (1/1) ... [2020-07-21 22:07:20,505 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 22:07:20,522 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 22:07:20,698 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 22:07:20,703 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 22:07:20,723 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 22:07:20,740 INFO L208 MainTranslator]: Completed translation [2020-07-21 22:07:20,741 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:07:20 WrapperNode [2020-07-21 22:07:20,741 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 22:07:20,742 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 22:07:20,742 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 22:07:20,742 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 22:07:20,758 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:07:20" (1/1) ... [2020-07-21 22:07:20,759 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:07:20" (1/1) ... [2020-07-21 22:07:20,764 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:07:20" (1/1) ... [2020-07-21 22:07:20,765 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:07:20" (1/1) ... [2020-07-21 22:07:20,770 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:07:20" (1/1) ... [2020-07-21 22:07:20,773 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:07:20" (1/1) ... [2020-07-21 22:07:20,774 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:07:20" (1/1) ... [2020-07-21 22:07:20,776 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 22:07:20,778 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 22:07:20,778 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 22:07:20,778 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 22:07:20,779 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:07:20" (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 22:07:20,948 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 22:07:20,948 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 22:07:20,948 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-21 22:07:20,948 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 22:07:20,948 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 22:07:20,948 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 22:07:20,949 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-21 22:07:20,949 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 22:07:20,949 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 22:07:20,949 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 22:07:21,126 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 22:07:21,126 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 22:07:21,130 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:07:21 BoogieIcfgContainer [2020-07-21 22:07:21,131 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 22:07:21,132 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 22:07:21,132 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 22:07:21,135 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 22:07:21,136 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 10:07:20" (1/3) ... [2020-07-21 22:07:21,137 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@61fb524 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:07:21, skipping insertion in model container [2020-07-21 22:07:21,137 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:07:20" (2/3) ... [2020-07-21 22:07:21,138 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@61fb524 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:07:21, skipping insertion in model container [2020-07-21 22:07:21,138 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:07:21" (3/3) ... [2020-07-21 22:07:21,140 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_25-1.c [2020-07-21 22:07:21,151 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 22:07:21,159 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 22:07:21,174 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 22:07:21,201 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 22:07:21,201 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 22:07:21,201 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 22:07:21,201 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 22:07:21,201 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 22:07:21,202 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 22:07:21,202 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 22:07:21,202 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 22:07:21,219 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-21 22:07:21,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 22:07:21,226 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:07:21,227 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:07:21,228 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:07:21,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:07:21,234 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-21 22:07:21,242 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:07:21,243 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [200456423] [2020-07-21 22:07:21,243 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:07:21,321 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:07:21,321 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:07:21,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 22:07:21,342 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:07:21,524 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 22:07:21,524 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:07:21,526 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [200456423] [2020-07-21 22:07:21,526 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:07:21,527 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 22:07:21,528 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1322380367] [2020-07-21 22:07:21,533 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 22:07:21,533 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:07:21,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 22:07:21,545 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 22:07:21,547 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-21 22:07:21,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:07:21,686 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-21 22:07:21,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 22:07:21,689 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 22:07:21,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:07:21,700 INFO L225 Difference]: With dead ends: 35 [2020-07-21 22:07:21,700 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 22:07:21,703 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 22:07:21,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 22:07:21,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 22:07:21,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 22:07:21,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 22:07:21,747 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-21 22:07:21,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:07:21,748 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 22:07:21,748 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 22:07:21,748 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 22:07:21,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 22:07:21,750 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:07:21,750 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:07:21,956 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:07:21,957 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:07:21,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:07:21,958 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-21 22:07:21,959 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:07:21,959 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2129200651] [2020-07-21 22:07:21,960 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 22:07:21,985 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:07:21,986 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:07:21,987 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 22:07:21,988 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:07:22,035 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 22:07:22,035 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:07:22,036 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2129200651] [2020-07-21 22:07:22,036 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:07:22,036 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 22:07:22,037 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1087404683] [2020-07-21 22:07:22,038 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 22:07:22,039 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:07:22,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 22:07:22,040 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 22:07:22,040 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-21 22:07:22,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:07:22,111 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-21 22:07:22,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 22:07:22,112 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 22:07:22,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:07:22,113 INFO L225 Difference]: With dead ends: 27 [2020-07-21 22:07:22,114 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 22:07:22,115 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 22:07:22,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 22:07:22,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-21 22:07:22,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 22:07:22,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 22:07:22,124 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-21 22:07:22,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:07:22,124 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 22:07:22,125 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 22:07:22,125 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 22:07:22,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 22:07:22,126 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:07:22,127 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 22:07:22,341 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:07:22,343 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:07:22,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:07:22,344 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-21 22:07:22,344 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:07:22,345 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [957426768] [2020-07-21 22:07:22,346 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:07:22,386 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:07:22,387 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:07:22,388 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 22:07:22,390 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:07:22,430 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 22:07:22,431 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:07:22,597 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:22,643 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 22:07:22,644 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [957426768] [2020-07-21 22:07:22,644 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:07:22,645 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 22:07:22,645 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1559801024] [2020-07-21 22:07:22,646 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 22:07:22,646 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:07:22,646 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 22:07:22,647 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 22:07:22,647 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-21 22:07:22,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:07:22,755 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-21 22:07:22,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 22:07:22,756 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-21 22:07:22,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:07:22,758 INFO L225 Difference]: With dead ends: 32 [2020-07-21 22:07:22,758 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 22:07:22,759 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 22:07:22,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 22:07:22,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-21 22:07:22,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 22:07:22,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 22:07:22,768 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-21 22:07:22,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:07:22,769 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 22:07:22,769 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 22:07:22,769 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 22:07:22,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 22:07:22,771 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:07:22,771 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 22:07:22,984 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:07:22,985 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:07:22,986 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:07:22,986 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-21 22:07:22,987 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:07:22,987 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1336551999] [2020-07-21 22:07:22,988 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:07:23,015 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:07:23,015 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:07:23,016 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 22:07:23,018 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:07:23,061 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 22:07:23,062 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:07:23,205 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:23,237 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 22:07:23,238 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1336551999] [2020-07-21 22:07:23,238 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:07:23,238 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 22:07:23,239 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1226238309] [2020-07-21 22:07:23,239 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 22:07:23,240 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:07:23,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 22:07:23,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 22:07:23,240 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-21 22:07:23,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:07:23,329 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-21 22:07:23,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 22:07:23,330 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-21 22:07:23,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:07:23,332 INFO L225 Difference]: With dead ends: 37 [2020-07-21 22:07:23,332 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 22:07:23,333 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 22:07:23,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 22:07:23,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-21 22:07:23,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 22:07:23,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 22:07:23,342 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-21 22:07:23,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:07:23,343 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 22:07:23,343 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 22:07:23,343 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 22:07:23,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 22:07:23,345 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:07:23,345 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 22:07:23,558 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:07:23,559 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:07:23,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:07:23,560 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-21 22:07:23,560 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:07:23,561 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1398689603] [2020-07-21 22:07:23,561 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:07:23,595 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:07:23,596 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:07:23,597 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 22:07:23,599 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:07:23,645 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 22:07:23,646 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:07:23,878 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:23,880 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:23,936 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:23,937 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:23,972 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 22:07:23,973 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1398689603] [2020-07-21 22:07:23,974 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:07:23,974 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 22:07:23,974 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [980431581] [2020-07-21 22:07:23,975 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 22:07:23,975 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:07:23,976 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 22:07:23,976 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 22:07:23,976 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-21 22:07:24,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:07:24,134 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-21 22:07:24,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 22:07:24,135 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-21 22:07:24,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:07:24,138 INFO L225 Difference]: With dead ends: 42 [2020-07-21 22:07:24,138 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 22:07:24,139 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 22:07:24,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 22:07:24,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-21 22:07:24,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 22:07:24,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 22:07:24,150 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-21 22:07:24,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:07:24,151 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 22:07:24,151 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 22:07:24,151 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 22:07:24,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 22:07:24,153 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:07:24,153 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 22:07:24,355 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:07:24,356 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:07:24,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:07:24,357 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-21 22:07:24,358 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:07:24,359 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1937954355] [2020-07-21 22:07:24,359 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:07:24,401 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:07:24,401 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:07:24,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 22:07:24,405 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:07:24,458 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 22:07:24,459 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:07:24,699 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:24,767 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:24,768 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:24,809 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 22:07:24,810 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1937954355] [2020-07-21 22:07:24,810 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:07:24,810 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 22:07:24,811 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [603457629] [2020-07-21 22:07:24,811 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 22:07:24,811 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:07:24,812 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 22:07:24,812 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 22:07:24,812 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-21 22:07:24,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:07:24,962 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-21 22:07:24,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 22:07:24,963 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-21 22:07:24,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:07:24,968 INFO L225 Difference]: With dead ends: 47 [2020-07-21 22:07:24,969 INFO L226 Difference]: Without dead ends: 43 [2020-07-21 22:07:24,975 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 22:07:24,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-21 22:07:24,994 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-21 22:07:24,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 22:07:24,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 22:07:24,996 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-21 22:07:24,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:07:24,996 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 22:07:24,997 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 22:07:24,997 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 22:07:25,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-21 22:07:25,006 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:07:25,009 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 22:07:25,222 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:07:25,223 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:07:25,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:07:25,224 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-21 22:07:25,225 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:07:25,226 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [732768789] [2020-07-21 22:07:25,226 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:07:25,266 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:07:25,267 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:07:25,268 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 22:07:25,271 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:07:25,335 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 22:07:25,335 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:07:25,799 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:25,921 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:25,922 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:25,971 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:25,972 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:26,011 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 22:07:26,012 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [732768789] [2020-07-21 22:07:26,012 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:07:26,012 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 22:07:26,012 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [130003209] [2020-07-21 22:07:26,015 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 22:07:26,016 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:07:26,016 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 22:07:26,017 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 22:07:26,017 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-21 22:07:26,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:07:26,217 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-21 22:07:26,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 22:07:26,218 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-21 22:07:26,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:07:26,224 INFO L225 Difference]: With dead ends: 52 [2020-07-21 22:07:26,224 INFO L226 Difference]: Without dead ends: 48 [2020-07-21 22:07:26,225 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 22:07:26,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-21 22:07:26,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-21 22:07:26,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 22:07:26,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 22:07:26,251 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-21 22:07:26,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:07:26,252 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 22:07:26,252 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 22:07:26,252 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 22:07:26,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-21 22:07:26,261 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:07:26,261 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 22:07:26,474 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:07:26,475 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:07:26,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:07:26,475 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-21 22:07:26,476 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:07:26,476 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [740399608] [2020-07-21 22:07:26,476 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:07:26,514 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:07:26,515 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:07:26,516 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 22:07:26,519 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:07:26,596 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 22:07:26,596 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:07:27,056 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:27,147 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:27,148 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:27,200 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:27,251 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 22:07:27,255 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [740399608] [2020-07-21 22:07:27,256 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:07:27,256 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 22:07:27,256 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [431723058] [2020-07-21 22:07:27,259 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 22:07:27,260 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:07:27,260 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 22:07:27,261 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 22:07:27,261 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 13 states. [2020-07-21 22:07:27,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:07:27,414 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-21 22:07:27,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 22:07:27,416 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 96 [2020-07-21 22:07:27,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:07:27,418 INFO L225 Difference]: With dead ends: 57 [2020-07-21 22:07:27,418 INFO L226 Difference]: Without dead ends: 53 [2020-07-21 22:07:27,419 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 172 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-21 22:07:27,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-21 22:07:27,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-21 22:07:27,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 22:07:27,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 22:07:27,432 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-21 22:07:27,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:07:27,433 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 22:07:27,433 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 22:07:27,433 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 22:07:27,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-21 22:07:27,435 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:07:27,435 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 22:07:27,650 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:07:27,651 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:07:27,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:07:27,652 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-21 22:07:27,653 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:07:27,653 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [990610801] [2020-07-21 22:07:27,654 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 22:07:27,700 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:07:27,700 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:07:27,701 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 22:07:27,705 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:07:27,812 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 22:07:27,813 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:07:28,454 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:28,455 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:28,631 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:28,719 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:28,779 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:28,823 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 22:07:28,824 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [990610801] [2020-07-21 22:07:28,824 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:07:28,824 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 22:07:28,825 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [28411151] [2020-07-21 22:07:28,825 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 22:07:28,825 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:07:28,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 22:07:28,826 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 22:07:28,826 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 15 states. [2020-07-21 22:07:29,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:07:29,129 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-21 22:07:29,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 22:07:29,130 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 117 [2020-07-21 22:07:29,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:07:29,132 INFO L225 Difference]: With dead ends: 62 [2020-07-21 22:07:29,133 INFO L226 Difference]: Without dead ends: 58 [2020-07-21 22:07:29,134 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 211 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-21 22:07:29,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-21 22:07:29,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-21 22:07:29,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 22:07:29,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 22:07:29,147 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-21 22:07:29,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:07:29,147 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 22:07:29,148 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 22:07:29,148 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 22:07:29,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-21 22:07:29,150 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:07:29,150 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 22:07:29,366 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:07:29,367 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:07:29,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:07:29,367 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-21 22:07:29,368 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:07:29,368 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1020527860] [2020-07-21 22:07:29,368 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:07:29,432 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:07:29,432 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:07:29,433 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 22:07:29,437 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:07:29,530 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 22:07:29,530 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:07:30,282 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:30,489 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:30,579 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:30,581 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:30,630 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:30,631 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:30,684 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 22:07:30,685 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1020527860] [2020-07-21 22:07:30,685 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:07:30,685 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 22:07:30,685 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1013124770] [2020-07-21 22:07:30,686 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 22:07:30,686 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:07:30,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 22:07:30,687 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 22:07:30,687 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 15 states. [2020-07-21 22:07:30,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:07:30,861 INFO L93 Difference]: Finished difference Result 67 states and 168 transitions. [2020-07-21 22:07:30,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 22:07:30,862 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 190 [2020-07-21 22:07:30,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:07:30,867 INFO L225 Difference]: With dead ends: 67 [2020-07-21 22:07:30,867 INFO L226 Difference]: Without dead ends: 63 [2020-07-21 22:07:30,869 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 22:07:30,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-21 22:07:30,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 41. [2020-07-21 22:07:30,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 22:07:30,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 22:07:30,896 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 190 [2020-07-21 22:07:30,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:07:30,899 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 22:07:30,899 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 22:07:30,899 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 22:07:30,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-21 22:07:30,906 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:07:30,907 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 22:07:31,120 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:07:31,121 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:07:31,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:07:31,121 INFO L82 PathProgramCache]: Analyzing trace with hash -1082984306, now seen corresponding path program 5 times [2020-07-21 22:07:31,122 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:07:31,122 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1508082428] [2020-07-21 22:07:31,122 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:07:31,209 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:07:31,209 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:07:31,210 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 22:07:31,217 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:07:31,326 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 22:07:31,326 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:07:32,586 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:32,937 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:33,105 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:33,191 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:33,238 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:33,239 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:33,337 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 22:07:33,338 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1508082428] [2020-07-21 22:07:33,338 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:07:33,339 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 22:07:33,339 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1720178736] [2020-07-21 22:07:33,340 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 22:07:33,340 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:07:33,340 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 22:07:33,341 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 22:07:33,341 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 17 states. [2020-07-21 22:07:33,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:07:33,557 INFO L93 Difference]: Finished difference Result 72 states and 194 transitions. [2020-07-21 22:07:33,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 22:07:33,558 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 286 [2020-07-21 22:07:33,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:07:33,561 INFO L225 Difference]: With dead ends: 72 [2020-07-21 22:07:33,561 INFO L226 Difference]: Without dead ends: 68 [2020-07-21 22:07:33,563 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 22:07:33,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-07-21 22:07:33,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-07-21 22:07:33,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 22:07:33,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-21 22:07:33,591 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 286 [2020-07-21 22:07:33,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:07:33,592 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-21 22:07:33,592 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 22:07:33,593 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-21 22:07:33,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 301 [2020-07-21 22:07:33,598 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:07:33,598 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 35, 21, 21, 21, 21, 21, 21, 21, 14, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:07:33,813 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:07:33,814 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:07:33,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:07:33,815 INFO L82 PathProgramCache]: Analyzing trace with hash -1101007572, now seen corresponding path program 5 times [2020-07-21 22:07:33,815 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:07:33,816 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [466845807] [2020-07-21 22:07:33,816 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:07:33,904 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:07:33,904 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:07:33,906 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 22:07:33,911 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:07:34,072 INFO L134 CoverageAnalysis]: Checked inductivity of 5047 backedges. 159 proven. 1061 refuted. 0 times theorem prover too weak. 3827 trivial. 0 not checked. [2020-07-21 22:07:34,072 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:07:35,312 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:35,636 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:35,807 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:35,895 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:35,896 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:35,943 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:36,040 INFO L134 CoverageAnalysis]: Checked inductivity of 5047 backedges. 159 proven. 1101 refuted. 0 times theorem prover too weak. 3787 trivial. 0 not checked. [2020-07-21 22:07:36,040 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [466845807] [2020-07-21 22:07:36,040 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:07:36,040 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 22:07:36,041 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [248586572] [2020-07-21 22:07:36,041 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 22:07:36,042 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:07:36,042 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 22:07:36,042 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 22:07:36,042 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 17 states. [2020-07-21 22:07:36,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:07:36,299 INFO L93 Difference]: Finished difference Result 77 states and 222 transitions. [2020-07-21 22:07:36,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 22:07:36,300 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 300 [2020-07-21 22:07:36,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:07:36,307 INFO L225 Difference]: With dead ends: 77 [2020-07-21 22:07:36,308 INFO L226 Difference]: Without dead ends: 73 [2020-07-21 22:07:36,310 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 605 GetRequests, 572 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-21 22:07:36,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-21 22:07:36,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 46. [2020-07-21 22:07:36,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 22:07:36,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-21 22:07:36,333 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 300 [2020-07-21 22:07:36,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:07:36,334 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-21 22:07:36,334 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 22:07:36,334 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-21 22:07:36,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 469 [2020-07-21 22:07:36,345 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:07:36,346 INFO L422 BasicCegarLoop]: trace histogram [71, 71, 36, 35, 35, 35, 35, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:07:36,558 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:07:36,559 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:07:36,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:07:36,559 INFO L82 PathProgramCache]: Analyzing trace with hash -897924696, now seen corresponding path program 6 times [2020-07-21 22:07:36,559 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:07:36,560 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1822482768] [2020-07-21 22:07:36,560 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:07:36,685 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:07:36,686 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:07:36,687 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 22:07:36,694 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:07:36,909 INFO L134 CoverageAnalysis]: Checked inductivity of 12915 backedges. 306 proven. 1995 refuted. 0 times theorem prover too weak. 10614 trivial. 0 not checked. [2020-07-21 22:07:36,909 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:07:38,932 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:39,466 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:39,728 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:39,915 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:39,916 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:40,001 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:40,050 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:40,051 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:40,184 INFO L134 CoverageAnalysis]: Checked inductivity of 12915 backedges. 306 proven. 2046 refuted. 0 times theorem prover too weak. 10563 trivial. 0 not checked. [2020-07-21 22:07:40,184 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1822482768] [2020-07-21 22:07:40,184 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:07:40,185 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-21 22:07:40,185 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [523707434] [2020-07-21 22:07:40,186 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 22:07:40,186 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:07:40,186 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 22:07:40,186 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-21 22:07:40,187 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 19 states. [2020-07-21 22:07:40,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:07:40,582 INFO L93 Difference]: Finished difference Result 82 states and 252 transitions. [2020-07-21 22:07:40,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 22:07:40,583 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 468 [2020-07-21 22:07:40,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:07:40,592 INFO L225 Difference]: With dead ends: 82 [2020-07-21 22:07:40,592 INFO L226 Difference]: Without dead ends: 78 [2020-07-21 22:07:40,593 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 943 GetRequests, 905 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-21 22:07:40,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-21 22:07:40,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 51. [2020-07-21 22:07:40,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 22:07:40,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-21 22:07:40,616 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 468 [2020-07-21 22:07:40,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:07:40,619 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-21 22:07:40,619 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 22:07:40,619 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-21 22:07:40,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2020-07-21 22:07:40,625 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:07:40,626 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 22:07:40,839 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:07:40,840 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:07:40,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:07:40,841 INFO L82 PathProgramCache]: Analyzing trace with hash -1350718391, now seen corresponding path program 6 times [2020-07-21 22:07:40,841 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:07:40,842 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [920606596] [2020-07-21 22:07:40,842 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:07:40,981 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:07:40,982 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:07:40,983 INFO L263 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 22:07:40,991 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:07:41,157 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1918 refuted. 0 times theorem prover too weak. 9431 trivial. 0 not checked. [2020-07-21 22:07:41,157 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:07:42,877 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:43,581 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:43,582 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:43,917 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:43,918 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:44,074 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:44,173 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:44,174 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:44,229 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:44,363 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1975 refuted. 0 times theorem prover too weak. 9374 trivial. 0 not checked. [2020-07-21 22:07:44,364 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [920606596] [2020-07-21 22:07:44,364 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:07:44,364 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-21 22:07:44,364 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1674547706] [2020-07-21 22:07:44,365 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 22:07:44,365 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:07:44,366 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 22:07:44,366 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-21 22:07:44,366 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 19 states. [2020-07-21 22:07:44,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:07:44,865 INFO L93 Difference]: Finished difference Result 87 states and 284 transitions. [2020-07-21 22:07:44,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 22:07:44,866 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 450 [2020-07-21 22:07:44,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:07:44,873 INFO L225 Difference]: With dead ends: 87 [2020-07-21 22:07:44,873 INFO L226 Difference]: Without dead ends: 83 [2020-07-21 22:07:44,876 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 906 GetRequests, 868 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-21 22:07:44,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-07-21 22:07:44,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 51. [2020-07-21 22:07:44,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 22:07:44,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-21 22:07:44,908 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 450 [2020-07-21 22:07:44,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:07:44,910 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-21 22:07:44,910 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 22:07:44,910 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-21 22:07:44,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 872 [2020-07-21 22:07:44,923 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:07:44,924 INFO L422 BasicCegarLoop]: trace histogram [133, 133, 67, 66, 66, 66, 66, 66, 66, 66, 66, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:07:45,137 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:07:45,138 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:07:45,138 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:07:45,139 INFO L82 PathProgramCache]: Analyzing trace with hash -1701713687, now seen corresponding path program 7 times [2020-07-21 22:07:45,139 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:07:45,139 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [33999806] [2020-07-21 22:07:45,140 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:07:45,348 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:07:45,349 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:07:45,352 INFO L263 TraceCheckSpWp]: Trace formula consists of 485 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 22:07:45,375 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:07:45,747 INFO L134 CoverageAnalysis]: Checked inductivity of 45837 backedges. 778 proven. 4406 refuted. 0 times theorem prover too weak. 40653 trivial. 0 not checked. [2020-07-21 22:07:45,748 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:07:48,714 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:48,715 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:50,080 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:50,727 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:50,728 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:51,111 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:51,113 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:51,302 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:51,303 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:51,395 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:51,396 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:51,445 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:51,786 INFO L134 CoverageAnalysis]: Checked inductivity of 45837 backedges. 778 proven. 4476 refuted. 0 times theorem prover too weak. 40583 trivial. 0 not checked. [2020-07-21 22:07:51,787 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [33999806] [2020-07-21 22:07:51,787 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:07:51,788 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-21 22:07:51,788 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [170458989] [2020-07-21 22:07:51,789 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 22:07:51,790 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:07:51,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 22:07:51,790 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-21 22:07:51,790 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 21 states. [2020-07-21 22:07:52,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:07:52,239 INFO L93 Difference]: Finished difference Result 92 states and 318 transitions. [2020-07-21 22:07:52,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 22:07:52,240 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 871 [2020-07-21 22:07:52,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:07:52,246 INFO L225 Difference]: With dead ends: 92 [2020-07-21 22:07:52,246 INFO L226 Difference]: Without dead ends: 88 [2020-07-21 22:07:52,267 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1750 GetRequests, 1707 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-21 22:07:52,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-21 22:07:52,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 56. [2020-07-21 22:07:52,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 22:07:52,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-21 22:07:52,286 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 871 [2020-07-21 22:07:52,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:07:52,287 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-21 22:07:52,287 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 22:07:52,288 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-21 22:07:52,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1078 [2020-07-21 22:07:52,300 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:07:52,301 INFO L422 BasicCegarLoop]: trace histogram [157, 157, 128, 78, 78, 78, 78, 78, 78, 78, 50, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:07:52,515 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:07:52,516 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:07:52,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:07:52,516 INFO L82 PathProgramCache]: Analyzing trace with hash 860290653, now seen corresponding path program 7 times [2020-07-21 22:07:52,516 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:07:52,517 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1249873318] [2020-07-21 22:07:52,517 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:07:52,765 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:07:52,765 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:07:52,768 INFO L263 TraceCheckSpWp]: Trace formula consists of 597 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 22:07:52,782 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:07:53,309 INFO L134 CoverageAnalysis]: Checked inductivity of 69124 backedges. 831 proven. 5812 refuted. 0 times theorem prover too weak. 62481 trivial. 0 not checked. [2020-07-21 22:07:53,310 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:07:56,934 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:56,935 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:58,268 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:58,954 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:58,955 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:59,315 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:59,316 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:59,481 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:59,573 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:59,626 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:00,090 INFO L134 CoverageAnalysis]: Checked inductivity of 69124 backedges. 831 proven. 5889 refuted. 0 times theorem prover too weak. 62404 trivial. 0 not checked. [2020-07-21 22:08:00,091 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1249873318] [2020-07-21 22:08:00,091 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:08:00,091 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-21 22:08:00,092 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1065446993] [2020-07-21 22:08:00,097 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 22:08:00,097 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:08:00,098 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 22:08:00,098 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-21 22:08:00,098 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 21 states. [2020-07-21 22:08:00,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:08:00,617 INFO L93 Difference]: Finished difference Result 97 states and 354 transitions. [2020-07-21 22:08:00,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 22:08:00,618 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1077 [2020-07-21 22:08:00,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:08:00,622 INFO L225 Difference]: With dead ends: 97 [2020-07-21 22:08:00,622 INFO L226 Difference]: Without dead ends: 93 [2020-07-21 22:08:00,623 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2161 GetRequests, 2118 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-21 22:08:00,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-21 22:08:00,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 56. [2020-07-21 22:08:00,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 22:08:00,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-21 22:08:00,638 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 1077 [2020-07-21 22:08:00,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:08:00,640 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-21 22:08:00,640 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 22:08:00,640 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-21 22:08:00,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1574 [2020-07-21 22:08:00,664 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:08:00,665 INFO L422 BasicCegarLoop]: trace histogram [241, 241, 121, 120, 120, 120, 120, 120, 120, 120, 120, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:08:00,878 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:08:00,879 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:08:00,879 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:08:00,880 INFO L82 PathProgramCache]: Analyzing trace with hash 78333505, now seen corresponding path program 8 times [2020-07-21 22:08:00,880 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:08:00,880 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [156449975] [2020-07-21 22:08:00,881 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:08:01,230 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:08:01,230 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:08:01,234 INFO L263 TraceCheckSpWp]: Trace formula consists of 876 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 22:08:01,254 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:08:02,490 INFO L134 CoverageAnalysis]: Checked inductivity of 151380 backedges. 1563 proven. 9337 refuted. 0 times theorem prover too weak. 140480 trivial. 0 not checked. [2020-07-21 22:08:02,490 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:08:07,601 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:09,985 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:11,287 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:11,847 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:11,848 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:12,241 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:12,242 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:12,467 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:12,566 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:12,567 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:12,620 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:12,623 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:13,576 INFO L134 CoverageAnalysis]: Checked inductivity of 151380 backedges. 1563 proven. 9429 refuted. 0 times theorem prover too weak. 140388 trivial. 0 not checked. [2020-07-21 22:08:13,577 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [156449975] [2020-07-21 22:08:13,577 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:08:13,578 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-21 22:08:13,578 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2145605885] [2020-07-21 22:08:13,580 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 22:08:13,580 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:08:13,580 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 22:08:13,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 22:08:13,582 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 23 states. [2020-07-21 22:08:14,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:08:14,413 INFO L93 Difference]: Finished difference Result 102 states and 392 transitions. [2020-07-21 22:08:14,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 22:08:14,413 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1573 [2020-07-21 22:08:14,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:08:14,420 INFO L225 Difference]: With dead ends: 102 [2020-07-21 22:08:14,420 INFO L226 Difference]: Without dead ends: 98 [2020-07-21 22:08:14,421 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3155 GetRequests, 3107 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-21 22:08:14,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-21 22:08:14,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 61. [2020-07-21 22:08:14,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 22:08:14,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-21 22:08:14,437 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1573 [2020-07-21 22:08:14,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:08:14,440 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-21 22:08:14,440 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 22:08:14,440 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-21 22:08:14,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1843 [2020-07-21 22:08:14,469 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:08:14,470 INFO L422 BasicCegarLoop]: trace histogram [269, 269, 221, 134, 134, 134, 134, 134, 134, 134, 87, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:08:14,683 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:08:14,684 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:08:14,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:08:14,685 INFO L82 PathProgramCache]: Analyzing trace with hash -323852785, now seen corresponding path program 8 times [2020-07-21 22:08:14,685 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:08:14,685 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [844057872] [2020-07-21 22:08:14,686 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:08:15,079 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:08:15,079 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:08:15,082 INFO L263 TraceCheckSpWp]: Trace formula consists of 1021 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 22:08:15,110 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:08:16,403 INFO L134 CoverageAnalysis]: Checked inductivity of 204138 backedges. 1703 proven. 11413 refuted. 0 times theorem prover too weak. 191022 trivial. 0 not checked. [2020-07-21 22:08:16,403 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:08:22,028 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:24,954 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:24,955 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:26,500 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:26,501 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:27,196 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:27,587 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:27,587 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:27,756 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:27,863 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:27,919 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:29,124 INFO L134 CoverageAnalysis]: Checked inductivity of 204138 backedges. 1703 proven. 11513 refuted. 0 times theorem prover too weak. 190922 trivial. 0 not checked. [2020-07-21 22:08:29,125 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [844057872] [2020-07-21 22:08:29,125 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:08:29,125 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-21 22:08:29,126 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [348337265] [2020-07-21 22:08:29,127 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 22:08:29,128 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:08:29,128 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 22:08:29,128 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 22:08:29,128 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 23 states. [2020-07-21 22:08:29,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:08:29,681 INFO L93 Difference]: Finished difference Result 107 states and 432 transitions. [2020-07-21 22:08:29,681 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 22:08:29,682 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1842 [2020-07-21 22:08:29,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:08:29,688 INFO L225 Difference]: With dead ends: 107 [2020-07-21 22:08:29,688 INFO L226 Difference]: Without dead ends: 103 [2020-07-21 22:08:29,690 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3692 GetRequests, 3644 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-21 22:08:29,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-21 22:08:29,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 61. [2020-07-21 22:08:29,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 22:08:29,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-21 22:08:29,707 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1842 [2020-07-21 22:08:29,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:08:29,709 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-21 22:08:29,709 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 22:08:29,709 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-21 22:08:29,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2107 [2020-07-21 22:08:29,753 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:08:29,754 INFO L422 BasicCegarLoop]: trace histogram [323, 323, 162, 161, 161, 161, 161, 161, 161, 161, 161, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:08:29,967 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:08:29,968 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:08:29,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:08:29,968 INFO L82 PathProgramCache]: Analyzing trace with hash 211951896, now seen corresponding path program 9 times [2020-07-21 22:08:29,969 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:08:29,969 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [89196096] [2020-07-21 22:08:29,969 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:08:30,463 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:08:30,464 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:08:30,468 INFO L263 TraceCheckSpWp]: Trace formula consists of 1173 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 22:08:30,498 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:08:32,123 INFO L134 CoverageAnalysis]: Checked inductivity of 272412 backedges. 2152 proven. 14276 refuted. 0 times theorem prover too weak. 255984 trivial. 0 not checked. [2020-07-21 22:08:32,124 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:08:39,318 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:43,122 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:45,050 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:46,080 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:46,081 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:46,783 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:46,784 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:47,172 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:47,174 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:47,370 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:47,477 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:47,535 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:49,055 INFO L134 CoverageAnalysis]: Checked inductivity of 272412 backedges. 2152 proven. 14393 refuted. 0 times theorem prover too weak. 255867 trivial. 0 not checked. [2020-07-21 22:08:49,056 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [89196096] [2020-07-21 22:08:49,056 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:08:49,057 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-21 22:08:49,057 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1516754824] [2020-07-21 22:08:49,058 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 22:08:49,059 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:08:49,059 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 22:08:49,059 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-21 22:08:49,060 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 25 states. [2020-07-21 22:08:49,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:08:49,808 INFO L93 Difference]: Finished difference Result 112 states and 474 transitions. [2020-07-21 22:08:49,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 22:08:49,809 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2106 [2020-07-21 22:08:49,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:08:49,816 INFO L225 Difference]: With dead ends: 112 [2020-07-21 22:08:49,816 INFO L226 Difference]: Without dead ends: 108 [2020-07-21 22:08:49,818 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4222 GetRequests, 4169 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 22:08:49,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-21 22:08:49,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 66. [2020-07-21 22:08:49,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-21 22:08:49,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-21 22:08:49,835 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2106 [2020-07-21 22:08:49,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:08:49,836 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-21 22:08:49,837 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 22:08:49,837 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-21 22:08:49,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2206 [2020-07-21 22:08:49,875 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:08:49,876 INFO L422 BasicCegarLoop]: trace histogram [323, 323, 260, 161, 161, 161, 161, 161, 161, 161, 99, 63, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:08:50,088 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:08:50,089 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:08:50,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:08:50,091 INFO L82 PathProgramCache]: Analyzing trace with hash -576304576, now seen corresponding path program 9 times [2020-07-21 22:08:50,091 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:08:50,091 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [506797619] [2020-07-21 22:08:50,092 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:08:50,641 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:08:50,642 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:08:50,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 1220 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 22:08:50,670 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:08:52,624 INFO L134 CoverageAnalysis]: Checked inductivity of 293202 backedges. 2131 proven. 15429 refuted. 0 times theorem prover too weak. 275642 trivial. 0 not checked. [2020-07-21 22:08:52,625 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:09:00,106 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:04,076 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:06,125 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:06,126 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:07,042 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:07,714 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:08,032 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:08,254 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:08,366 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:08,367 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:08,432 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:08,433 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:10,188 INFO L134 CoverageAnalysis]: Checked inductivity of 293202 backedges. 2131 proven. 15555 refuted. 0 times theorem prover too weak. 275516 trivial. 0 not checked. [2020-07-21 22:09:10,188 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [506797619] [2020-07-21 22:09:10,189 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:09:10,189 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-21 22:09:10,189 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1898543016] [2020-07-21 22:09:10,191 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 22:09:10,191 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:09:10,191 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 22:09:10,191 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-21 22:09:10,192 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 25 states. [2020-07-21 22:09:10,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:09:10,998 INFO L93 Difference]: Finished difference Result 117 states and 518 transitions. [2020-07-21 22:09:10,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 22:09:10,999 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2205 [2020-07-21 22:09:11,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:09:11,007 INFO L225 Difference]: With dead ends: 117 [2020-07-21 22:09:11,007 INFO L226 Difference]: Without dead ends: 113 [2020-07-21 22:09:11,008 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4419 GetRequests, 4366 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 22:09:11,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2020-07-21 22:09:11,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 66. [2020-07-21 22:09:11,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-21 22:09:11,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-21 22:09:11,029 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2205 [2020-07-21 22:09:11,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:09:11,030 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-21 22:09:11,031 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 22:09:11,031 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-21 22:09:11,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3979 [2020-07-21 22:09:11,163 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:09:11,165 INFO L422 BasicCegarLoop]: trace histogram [611, 611, 306, 305, 305, 305, 305, 305, 305, 305, 305, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:09:11,379 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:09:11,379 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:09:11,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:09:11,382 INFO L82 PathProgramCache]: Analyzing trace with hash 1096565120, now seen corresponding path program 10 times [2020-07-21 22:09:11,382 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:09:11,382 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [58588470] [2020-07-21 22:09:11,383 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:09:12,198 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:09:12,198 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:09:12,205 INFO L263 TraceCheckSpWp]: Trace formula consists of 2216 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 22:09:12,244 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:09:18,204 INFO L134 CoverageAnalysis]: Checked inductivity of 977220 backedges. 4000 proven. 30795 refuted. 0 times theorem prover too weak. 942425 trivial. 0 not checked. [2020-07-21 22:09:18,204 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:09:33,755 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:33,756 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:40,667 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 22:09:41,050 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:44,246 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:46,049 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:47,467 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:48,119 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:48,120 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:48,571 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:48,770 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:48,886 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:48,949 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:54,008 INFO L134 CoverageAnalysis]: Checked inductivity of 977220 backedges. 4000 proven. 30940 refuted. 0 times theorem prover too weak. 942280 trivial. 0 not checked. [2020-07-21 22:09:54,008 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [58588470] [2020-07-21 22:09:54,009 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:09:54,009 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-21 22:09:54,010 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1023464849] [2020-07-21 22:09:54,012 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 22:09:54,012 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:09:54,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 22:09:54,013 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-21 22:09:54,013 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 27 states. [2020-07-21 22:09:55,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:09:55,162 INFO L93 Difference]: Finished difference Result 122 states and 564 transitions. [2020-07-21 22:09:55,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 22:09:55,163 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 3978 [2020-07-21 22:09:55,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:09:55,175 INFO L225 Difference]: With dead ends: 122 [2020-07-21 22:09:55,175 INFO L226 Difference]: Without dead ends: 118 [2020-07-21 22:09:55,177 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7967 GetRequests, 7909 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 22:09:55,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-21 22:09:55,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 71. [2020-07-21 22:09:55,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-21 22:09:55,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-21 22:09:55,200 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 3978 [2020-07-21 22:09:55,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:09:55,203 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-21 22:09:55,203 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 22:09:55,203 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-21 22:09:55,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5062 [2020-07-21 22:09:55,353 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:09:55,354 INFO L422 BasicCegarLoop]: trace histogram [737, 737, 632, 368, 368, 368, 368, 368, 368, 368, 264, 105, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:09:55,555 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:09:55,555 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:09:55,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:09:55,558 INFO L82 PathProgramCache]: Analyzing trace with hash -1250597211, now seen corresponding path program 10 times [2020-07-21 22:09:55,558 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:09:55,558 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [812744040] [2020-07-21 22:09:55,559 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:09:56,626 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:09:56,626 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:09:56,634 INFO L263 TraceCheckSpWp]: Trace formula consists of 2806 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 22:09:56,676 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:10:05,386 INFO L134 CoverageAnalysis]: Checked inductivity of 1554372 backedges. 5169 proven. 40185 refuted. 0 times theorem prover too weak. 1509018 trivial. 0 not checked. [2020-07-21 22:10:05,387 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:10:22,428 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:32,734 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:32,735 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:37,681 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:37,682 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:39,784 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:39,785 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:41,447 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:41,447 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:42,155 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:42,156 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:42,672 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:42,946 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:42,947 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:43,066 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:43,067 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:43,138 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:51,155 INFO L134 CoverageAnalysis]: Checked inductivity of 1554372 backedges. 5169 proven. 40340 refuted. 0 times theorem prover too weak. 1508863 trivial. 0 not checked. [2020-07-21 22:10:51,156 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [812744040] [2020-07-21 22:10:51,156 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:10:51,157 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-21 22:10:51,157 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [226817931] [2020-07-21 22:10:51,160 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 22:10:51,160 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:10:51,160 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 22:10:51,161 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-21 22:10:51,161 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 27 states. [2020-07-21 22:10:52,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:10:52,740 INFO L93 Difference]: Finished difference Result 127 states and 612 transitions. [2020-07-21 22:10:52,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 22:10:52,744 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 5061 [2020-07-21 22:10:52,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:10:52,754 INFO L225 Difference]: With dead ends: 127 [2020-07-21 22:10:52,755 INFO L226 Difference]: Without dead ends: 123 [2020-07-21 22:10:52,758 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10132 GetRequests, 10074 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 22:10:52,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2020-07-21 22:10:52,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 71. [2020-07-21 22:10:52,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-21 22:10:52,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-21 22:10:52,792 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 5061 [2020-07-21 22:10:52,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:10:52,796 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-21 22:10:52,796 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 22:10:52,796 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-21 22:10:53,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10297 [2020-07-21 22:10:53,369 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:10:53,372 INFO L422 BasicCegarLoop]: trace histogram [1583, 1583, 792, 791, 791, 791, 791, 791, 791, 791, 791, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:10:53,573 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:10:53,573 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:10:53,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:10:53,577 INFO L82 PathProgramCache]: Analyzing trace with hash -862919848, now seen corresponding path program 11 times [2020-07-21 22:10:53,577 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:10:53,577 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [226933270] [2020-07-21 22:10:53,578 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 22:10:55,360 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:10:55,360 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:10:55,380 INFO L263 TraceCheckSpWp]: Trace formula consists of 5736 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 22:10:55,452 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:11:26,778 INFO L134 CoverageAnalysis]: Checked inductivity of 6570837 backedges. 11410 proven. 88343 refuted. 0 times theorem prover too weak. 6471084 trivial. 0 not checked. [2020-07-21 22:11:26,778 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:12:06,460 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:12:29,633 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 26 [2020-07-21 22:12:33,822 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:12:46,824 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:12:46,825 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:12:51,747 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:12:51,748 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:12:53,746 WARN L193 SmtUtils]: Spent 791.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-21 22:12:56,786 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:12:58,461 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:12:58,462 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:12:59,747 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:12:59,748 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:13:00,411 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:13:00,717 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:13:00,719 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:13:00,859 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:13:00,935 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:13:32,916 INFO L134 CoverageAnalysis]: Checked inductivity of 6570837 backedges. 11410 proven. 88519 refuted. 0 times theorem prover too weak. 6470908 trivial. 0 not checked. [2020-07-21 22:13:32,917 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [226933270] [2020-07-21 22:13:32,917 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:13:32,919 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-21 22:13:32,919 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [916129409] [2020-07-21 22:13:32,926 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 22:13:32,927 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:13:32,927 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 22:13:32,928 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-21 22:13:32,928 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 29 states. [2020-07-21 22:13:34,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:13:34,920 INFO L93 Difference]: Finished difference Result 132 states and 662 transitions. [2020-07-21 22:13:34,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 22:13:34,922 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 10296 [2020-07-21 22:13:34,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:13:34,936 INFO L225 Difference]: With dead ends: 132 [2020-07-21 22:13:34,936 INFO L226 Difference]: Without dead ends: 128 [2020-07-21 22:13:34,938 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20604 GetRequests, 20541 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 22:13:34,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-07-21 22:13:34,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 76. [2020-07-21 22:13:34,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 22:13:34,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-21 22:13:34,962 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 10296 [2020-07-21 22:13:34,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:13:34,970 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-21 22:13:34,970 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 22:13:34,970 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-21 22:13:35,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8801 [2020-07-21 22:13:35,399 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:13:35,402 INFO L422 BasicCegarLoop]: trace histogram [1299, 1299, 999, 649, 649, 649, 649, 649, 649, 649, 350, 300, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:13:35,602 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:13:35,603 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:13:35,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:13:35,608 INFO L82 PathProgramCache]: Analyzing trace with hash 1495726316, now seen corresponding path program 11 times [2020-07-21 22:13:35,608 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:13:35,608 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [274687742] [2020-07-21 22:13:35,609 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:13:37,287 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:13:37,287 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:13:37,305 INFO L263 TraceCheckSpWp]: Trace formula consists of 4884 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 22:13:37,375 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:14:01,069 INFO L134 CoverageAnalysis]: Checked inductivity of 4711809 backedges. 9405 proven. 77140 refuted. 0 times theorem prover too weak. 4625264 trivial. 0 not checked. [2020-07-21 22:14:01,070 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:14:43,255 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:14:43,256 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:14:59,500 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:15:14,250 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:15:14,251 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:15:21,250 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:15:21,251 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:15:24,148 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:15:24,149 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:15:25,735 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:15:25,735 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:15:27,015 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:15:27,642 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:15:27,935 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:15:27,936 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:15:28,081 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:15:28,082 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:15:28,168 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:15:50,579 INFO L134 CoverageAnalysis]: Checked inductivity of 4711809 backedges. 9405 proven. 77327 refuted. 0 times theorem prover too weak. 4625077 trivial. 0 not checked. [2020-07-21 22:15:50,579 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [274687742] [2020-07-21 22:15:50,580 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:15:50,581 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-21 22:15:50,581 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1063130928] [2020-07-21 22:15:50,585 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 22:15:50,585 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:15:50,586 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 22:15:50,586 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-21 22:15:50,586 INFO L87 Difference]: Start difference. First operand 76 states and 234 transitions. Second operand 29 states. [2020-07-21 22:15:51,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:15:51,513 INFO L93 Difference]: Finished difference Result 137 states and 714 transitions. [2020-07-21 22:15:51,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 22:15:51,515 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 8800 [2020-07-21 22:15:51,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:15:51,528 INFO L225 Difference]: With dead ends: 137 [2020-07-21 22:15:51,528 INFO L226 Difference]: Without dead ends: 133 [2020-07-21 22:15:51,530 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17611 GetRequests, 17548 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 22:15:51,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-07-21 22:15:51,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 76. [2020-07-21 22:15:51,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 22:15:51,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-21 22:15:51,557 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 8800 [2020-07-21 22:15:51,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:15:51,562 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-21 22:15:51,562 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 22:15:51,562 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-21 22:15:52,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13651 [2020-07-21 22:15:52,854 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:15:52,858 INFO L422 BasicCegarLoop]: trace histogram [2099, 2099, 1050, 1049, 1049, 1049, 1049, 1049, 1049, 1049, 1049, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:15:53,058 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:15:53,059 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:15:53,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:15:53,064 INFO L82 PathProgramCache]: Analyzing trace with hash 942911774, now seen corresponding path program 12 times [2020-07-21 22:15:53,064 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:15:53,064 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [530045702] [2020-07-21 22:15:53,065 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:15:55,441 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:15:55,441 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:15:55,465 INFO L263 TraceCheckSpWp]: Trace formula consists of 7611 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 22:15:55,559 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:16:48,967 INFO L134 CoverageAnalysis]: Checked inductivity of 11555784 backedges. 12894 proven. 131034 refuted. 0 times theorem prover too weak. 11411856 trivial. 0 not checked. [2020-07-21 22:16:48,967 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:17:03,508 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-21 22:17:03,616 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-21 22:17:03,724 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-21 22:18:11,929 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:18:17,118 WARN L193 SmtUtils]: Spent 1.06 s on a formula simplification that was a NOOP. DAG size: 1 [2020-07-21 22:18:44,749 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-21 22:18:45,114 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:18:45,115 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:18:57,282 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:18:57,283 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:08,143 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:13,563 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:16,490 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:17,893 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:18,910 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:18,911 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:19,434 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:19,762 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:19,966 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:20,091 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:16,745 INFO L134 CoverageAnalysis]: Checked inductivity of 11555784 backedges. 12894 proven. 131244 refuted. 0 times theorem prover too weak. 11411646 trivial. 0 not checked. [2020-07-21 22:20:16,745 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [530045702] [2020-07-21 22:20:16,745 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:20:16,749 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 29] total 31 [2020-07-21 22:20:16,749 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [767397049] [2020-07-21 22:20:16,753 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-21 22:20:16,754 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:20:16,754 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-21 22:20:16,755 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=688, Unknown=0, NotChecked=0, Total=930 [2020-07-21 22:20:16,755 INFO L87 Difference]: Start difference. First operand 76 states and 234 transitions. Second operand 31 states. [2020-07-21 22:20:20,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:20:20,748 INFO L93 Difference]: Finished difference Result 142 states and 768 transitions. [2020-07-21 22:20:20,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-21 22:20:20,751 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 13650 [2020-07-21 22:20:20,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:20:20,765 INFO L225 Difference]: With dead ends: 142 [2020-07-21 22:20:20,765 INFO L226 Difference]: Without dead ends: 138 [2020-07-21 22:20:20,767 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27313 GetRequests, 27245 SyntacticMatches, 26 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 494 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=619, Invalid=1273, Unknown=0, NotChecked=0, Total=1892 [2020-07-21 22:20:20,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2020-07-21 22:20:20,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 81. [2020-07-21 22:20:20,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-07-21 22:20:20,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 265 transitions. [2020-07-21 22:20:20,797 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 265 transitions. Word has length 13650 [2020-07-21 22:20:20,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:20:20,804 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 265 transitions. [2020-07-21 22:20:20,804 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-21 22:20:20,804 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 265 transitions. [2020-07-21 22:20:22,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9997 [2020-07-21 22:20:22,094 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:20:22,101 INFO L422 BasicCegarLoop]: trace histogram [1469, 1469, 1175, 734, 734, 734, 734, 734, 734, 734, 441, 294, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:20:22,316 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:22,317 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:20:22,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:20:22,319 INFO L82 PathProgramCache]: Analyzing trace with hash 1269322141, now seen corresponding path program 12 times [2020-07-21 22:20:22,319 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:20:22,319 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [555387377] [2020-07-21 22:20:22,320 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 22:20:24,267 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:20:24,267 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:20:24,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 5547 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 22:20:24,370 INFO L286 TraceCheckSpWp]: Computing forward predicates...