/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_5-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 16:00:30,590 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 16:00:30,593 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 16:00:30,613 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 16:00:30,613 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 16:00:30,614 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 16:00:30,616 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 16:00:30,618 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 16:00:30,620 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 16:00:30,621 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 16:00:30,622 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 16:00:30,623 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 16:00:30,624 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 16:00:30,625 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 16:00:30,626 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 16:00:30,627 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 16:00:30,628 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 16:00:30,629 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 16:00:30,631 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 16:00:30,633 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 16:00:30,635 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 16:00:30,639 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 16:00:30,640 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 16:00:30,641 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 16:00:30,647 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 16:00:30,668 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 16:00:30,669 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 16:00:30,670 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 16:00:30,672 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 16:00:30,699 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 16:00:30,699 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 16:00:30,702 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 16:00:30,702 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 16:00:30,702 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 16:00:30,703 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 16:00:30,703 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 16:00:30,703 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 16:00:30,703 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 16:00:30,703 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 16:00:30,705 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 16:00:30,705 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 16:00:30,705 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 16:00:30,706 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 16:00:30,706 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 16:00:30,706 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 16:00:30,706 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 16:00:30,707 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 16:00:30,707 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 16:00:30,707 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 16:00:30,707 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 16:00:30,708 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:00:30,708 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 16:00:30,708 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 16:00:30,708 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 16:00:30,708 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 16:00:30,709 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:30,709 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 16:00:30,709 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 16:00:30,709 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 16:00:31,074 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 16:00:31,097 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 16:00:31,101 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 16:00:31,102 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 16:00:31,103 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 16:00:31,103 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_5-2.c [2020-07-21 16:00:31,186 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d3137d481/f282b9b685b74d13af406dcd3b7e6d95/FLAG5e831dd60 [2020-07-21 16:00:31,713 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 16:00:31,714 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_5-2.c [2020-07-21 16:00:31,724 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d3137d481/f282b9b685b74d13af406dcd3b7e6d95/FLAG5e831dd60 [2020-07-21 16:00:32,091 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d3137d481/f282b9b685b74d13af406dcd3b7e6d95 [2020-07-21 16:00:32,102 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 16:00:32,105 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 16:00:32,107 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 16:00:32,107 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 16:00:32,111 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 16:00:32,112 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:00:32" (1/1) ... [2020-07-21 16:00:32,115 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1fcc4cc1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:32, skipping insertion in model container [2020-07-21 16:00:32,115 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:00:32" (1/1) ... [2020-07-21 16:00:32,123 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 16:00:32,142 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 16:00:32,329 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:00:32,333 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 16:00:32,349 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:00:32,364 INFO L208 MainTranslator]: Completed translation [2020-07-21 16:00:32,364 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:32 WrapperNode [2020-07-21 16:00:32,364 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 16:00:32,365 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 16:00:32,365 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 16:00:32,366 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 16:00:32,376 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:32" (1/1) ... [2020-07-21 16:00:32,376 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:32" (1/1) ... [2020-07-21 16:00:32,385 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:32" (1/1) ... [2020-07-21 16:00:32,385 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:32" (1/1) ... [2020-07-21 16:00:32,475 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:32" (1/1) ... [2020-07-21 16:00:32,479 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:32" (1/1) ... [2020-07-21 16:00:32,481 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:32" (1/1) ... [2020-07-21 16:00:32,483 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 16:00:32,484 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 16:00:32,484 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 16:00:32,484 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 16:00:32,485 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:32" (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 16:00:32,565 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 16:00:32,565 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 16:00:32,565 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-21 16:00:32,565 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-21 16:00:32,565 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 16:00:32,566 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 16:00:32,566 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 16:00:32,566 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-21 16:00:32,566 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-21 16:00:32,566 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 16:00:32,567 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 16:00:32,567 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 16:00:32,773 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 16:00:32,773 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 16:00:32,778 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:00:32 BoogieIcfgContainer [2020-07-21 16:00:32,779 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 16:00:32,780 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 16:00:32,780 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 16:00:32,782 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 16:00:32,783 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 04:00:32" (1/3) ... [2020-07-21 16:00:32,783 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@816b5df and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:00:32, skipping insertion in model container [2020-07-21 16:00:32,784 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:32" (2/3) ... [2020-07-21 16:00:32,784 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@816b5df and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:00:32, skipping insertion in model container [2020-07-21 16:00:32,784 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:00:32" (3/3) ... [2020-07-21 16:00:32,786 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_5-2.c [2020-07-21 16:00:32,798 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 16:00:32,807 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 16:00:32,822 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 16:00:32,849 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 16:00:32,850 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 16:00:32,850 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 16:00:32,850 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 16:00:32,850 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 16:00:32,850 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 16:00:32,851 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 16:00:32,851 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 16:00:32,868 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-21 16:00:32,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 16:00:32,874 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:32,876 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:32,876 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:32,882 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:32,882 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-21 16:00:32,889 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:32,890 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [99806034] [2020-07-21 16:00:32,890 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:32,974 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:32,975 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:32,994 INFO L263 TraceCheckSpWp]: Trace formula consists of 31 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 16:00:33,010 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:33,108 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 16:00:33,109 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:00:33,110 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [99806034] [2020-07-21 16:00:33,111 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:00:33,112 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 16:00:33,113 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1995791207] [2020-07-21 16:00:33,119 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 16:00:33,119 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:33,130 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 16:00:33,131 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 16:00:33,134 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-21 16:00:33,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:33,280 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-21 16:00:33,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 16:00:33,283 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 16:00:33,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:33,294 INFO L225 Difference]: With dead ends: 44 [2020-07-21 16:00:33,295 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 16:00:33,299 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 16:00:33,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 16:00:33,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-21 16:00:33,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 16:00:33,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 16:00:33,355 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-21 16:00:33,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:33,356 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 16:00:33,356 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 16:00:33,357 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 16:00:33,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 16:00:33,359 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:33,359 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:33,575 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:33,576 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:33,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:33,577 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-21 16:00:33,578 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:33,578 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [130429419] [2020-07-21 16:00:33,578 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:33,606 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:33,606 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:33,607 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 16:00:33,609 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:33,660 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 16:00:33,660 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:00:33,661 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [130429419] [2020-07-21 16:00:33,662 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:00:33,662 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 16:00:33,663 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1502960150] [2020-07-21 16:00:33,665 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 16:00:33,666 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:33,666 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 16:00:33,667 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 16:00:33,667 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-21 16:00:33,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:33,739 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-21 16:00:33,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 16:00:33,740 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 16:00:33,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:33,742 INFO L225 Difference]: With dead ends: 36 [2020-07-21 16:00:33,742 INFO L226 Difference]: Without dead ends: 32 [2020-07-21 16:00:33,744 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 16:00:33,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-21 16:00:33,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-21 16:00:33,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 16:00:33,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 16:00:33,755 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-21 16:00:33,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:33,755 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 16:00:33,756 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 16:00:33,756 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 16:00:33,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 16:00:33,758 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:33,758 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:33,974 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:33,974 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:33,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:33,975 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-21 16:00:33,975 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:33,976 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1650321131] [2020-07-21 16:00:33,976 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:34,011 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:34,012 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:34,013 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 16:00:34,015 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:34,075 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 16:00:34,076 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:34,275 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:34,279 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:34,330 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 16:00:34,331 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1650321131] [2020-07-21 16:00:34,331 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:34,331 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 16:00:34,332 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [178353103] [2020-07-21 16:00:34,332 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 16:00:34,333 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:34,333 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 16:00:34,333 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 16:00:34,333 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-21 16:00:34,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:34,484 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-21 16:00:34,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 16:00:34,486 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-21 16:00:34,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:34,490 INFO L225 Difference]: With dead ends: 41 [2020-07-21 16:00:34,491 INFO L226 Difference]: Without dead ends: 37 [2020-07-21 16:00:34,494 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 39 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:00:34,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-21 16:00:34,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-21 16:00:34,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 16:00:34,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 16:00:34,523 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-21 16:00:34,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:34,527 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 16:00:34,527 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 16:00:34,527 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 16:00:34,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 16:00:34,530 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:34,531 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:34,745 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:34,746 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:34,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:34,747 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-21 16:00:34,747 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:34,747 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2041116157] [2020-07-21 16:00:34,748 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 16:00:34,813 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:34,814 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:34,815 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 16:00:34,818 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:34,860 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 16:00:34,860 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:35,016 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:35,018 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:35,080 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 16:00:35,081 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2041116157] [2020-07-21 16:00:35,082 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:35,082 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 16:00:35,082 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [487022775] [2020-07-21 16:00:35,083 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 16:00:35,083 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:35,084 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 16:00:35,084 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 16:00:35,084 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-21 16:00:35,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:35,218 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-21 16:00:35,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 16:00:35,218 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-21 16:00:35,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:35,220 INFO L225 Difference]: With dead ends: 46 [2020-07-21 16:00:35,221 INFO L226 Difference]: Without dead ends: 42 [2020-07-21 16:00:35,221 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 42 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:00:35,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-21 16:00:35,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-21 16:00:35,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 16:00:35,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 16:00:35,231 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-21 16:00:35,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:35,231 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 16:00:35,231 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 16:00:35,231 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 16:00:35,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 16:00:35,233 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:35,233 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:35,441 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:35,443 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:35,443 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:35,444 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-21 16:00:35,444 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:35,445 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [957235704] [2020-07-21 16:00:35,446 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:35,486 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:35,486 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:35,487 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 16:00:35,490 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:35,573 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 16:00:35,573 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:35,854 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:35,947 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:35,948 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:35,990 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 16:00:35,990 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [957235704] [2020-07-21 16:00:35,991 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:35,991 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 16:00:35,991 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1662160461] [2020-07-21 16:00:35,992 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 16:00:35,992 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:35,992 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 16:00:35,993 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:00:35,993 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-21 16:00:36,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:36,177 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-21 16:00:36,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:00:36,178 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-21 16:00:36,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:36,180 INFO L225 Difference]: With dead ends: 51 [2020-07-21 16:00:36,180 INFO L226 Difference]: Without dead ends: 47 [2020-07-21 16:00:36,181 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 63 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-21 16:00:36,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-21 16:00:36,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-21 16:00:36,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-21 16:00:36,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-21 16:00:36,192 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-21 16:00:36,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:36,192 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-21 16:00:36,193 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 16:00:36,193 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-21 16:00:36,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-21 16:00:36,195 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:36,195 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:36,402 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:36,403 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:36,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:36,404 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-21 16:00:36,404 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:36,405 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1193543807] [2020-07-21 16:00:36,405 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:36,437 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:36,437 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:36,439 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 16:00:36,441 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:36,503 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 16:00:36,503 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:36,786 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:36,787 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:36,827 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 16:00:36,828 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1193543807] [2020-07-21 16:00:36,828 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:36,828 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-21 16:00:36,829 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1890292228] [2020-07-21 16:00:36,829 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 16:00:36,829 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:36,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 16:00:36,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:00:36,830 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 12 states. [2020-07-21 16:00:37,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:37,133 INFO L93 Difference]: Finished difference Result 84 states and 136 transitions. [2020-07-21 16:00:37,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:00:37,134 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-07-21 16:00:37,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:37,143 INFO L225 Difference]: With dead ends: 84 [2020-07-21 16:00:37,143 INFO L226 Difference]: Without dead ends: 50 [2020-07-21 16:00:37,145 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 64 SyntacticMatches, 7 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:00:37,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-07-21 16:00:37,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 47. [2020-07-21 16:00:37,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-07-21 16:00:37,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 67 transitions. [2020-07-21 16:00:37,187 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 67 transitions. Word has length 40 [2020-07-21 16:00:37,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:37,191 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 67 transitions. [2020-07-21 16:00:37,191 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 16:00:37,191 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 67 transitions. [2020-07-21 16:00:37,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 16:00:37,198 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:37,198 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:37,413 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:37,414 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:37,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:37,415 INFO L82 PathProgramCache]: Analyzing trace with hash 208191613, now seen corresponding path program 1 times [2020-07-21 16:00:37,415 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:37,415 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1065796056] [2020-07-21 16:00:37,415 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:37,460 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:37,461 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:37,463 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 16:00:37,467 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:37,513 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 16:00:37,514 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:37,763 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:37,814 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:37,854 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 16:00:37,855 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1065796056] [2020-07-21 16:00:37,855 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:37,856 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 16:00:37,856 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1707480728] [2020-07-21 16:00:37,856 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 16:00:37,857 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:37,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 16:00:37,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:00:37,857 INFO L87 Difference]: Start difference. First operand 47 states and 67 transitions. Second operand 12 states. [2020-07-21 16:00:38,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:38,018 INFO L93 Difference]: Finished difference Result 63 states and 99 transitions. [2020-07-21 16:00:38,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:00:38,019 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 41 [2020-07-21 16:00:38,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:38,022 INFO L225 Difference]: With dead ends: 63 [2020-07-21 16:00:38,022 INFO L226 Difference]: Without dead ends: 59 [2020-07-21 16:00:38,026 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-21 16:00:38,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-07-21 16:00:38,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 51. [2020-07-21 16:00:38,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 16:00:38,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 77 transitions. [2020-07-21 16:00:38,053 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 77 transitions. Word has length 41 [2020-07-21 16:00:38,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:38,054 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 77 transitions. [2020-07-21 16:00:38,054 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 16:00:38,054 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 77 transitions. [2020-07-21 16:00:38,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-07-21 16:00:38,061 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:38,061 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:38,262 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:38,263 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:38,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:38,264 INFO L82 PathProgramCache]: Analyzing trace with hash -1291563674, now seen corresponding path program 1 times [2020-07-21 16:00:38,264 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:38,265 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [471763592] [2020-07-21 16:00:38,265 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:38,304 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:38,305 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:38,306 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 16:00:38,309 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:38,374 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-21 16:00:38,374 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:38,525 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:38,591 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:38,632 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-21 16:00:38,633 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [471763592] [2020-07-21 16:00:38,638 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:38,639 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 16:00:38,639 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1438564731] [2020-07-21 16:00:38,640 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 16:00:38,643 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:38,644 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 16:00:38,644 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 16:00:38,645 INFO L87 Difference]: Start difference. First operand 51 states and 77 transitions. Second operand 10 states. [2020-07-21 16:00:38,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:38,764 INFO L93 Difference]: Finished difference Result 65 states and 105 transitions. [2020-07-21 16:00:38,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 16:00:38,765 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 53 [2020-07-21 16:00:38,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:38,767 INFO L225 Difference]: With dead ends: 65 [2020-07-21 16:00:38,767 INFO L226 Difference]: Without dead ends: 61 [2020-07-21 16:00:38,768 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 95 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:00:38,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-07-21 16:00:38,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 53. [2020-07-21 16:00:38,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-07-21 16:00:38,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 82 transitions. [2020-07-21 16:00:38,781 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 82 transitions. Word has length 53 [2020-07-21 16:00:38,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:38,781 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 82 transitions. [2020-07-21 16:00:38,781 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 16:00:38,781 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 82 transitions. [2020-07-21 16:00:38,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-07-21 16:00:38,783 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:38,783 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:38,997 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:38,998 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:38,999 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:38,999 INFO L82 PathProgramCache]: Analyzing trace with hash 736840020, now seen corresponding path program 2 times [2020-07-21 16:00:38,999 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:39,000 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [814248430] [2020-07-21 16:00:39,001 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:39,052 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:39,052 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:39,053 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 16:00:39,056 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:39,119 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 9 proven. 55 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-07-21 16:00:39,120 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:39,508 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:39,509 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:39,620 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:39,622 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:39,680 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:39,681 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:39,726 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 9 proven. 59 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2020-07-21 16:00:39,727 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [814248430] [2020-07-21 16:00:39,727 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:39,727 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 16:00:39,727 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [69161512] [2020-07-21 16:00:39,728 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 16:00:39,728 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:39,728 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 16:00:39,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 16:00:39,729 INFO L87 Difference]: Start difference. First operand 53 states and 82 transitions. Second operand 14 states. [2020-07-21 16:00:39,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:39,930 INFO L93 Difference]: Finished difference Result 75 states and 134 transitions. [2020-07-21 16:00:39,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 16:00:39,930 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 78 [2020-07-21 16:00:39,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:39,933 INFO L225 Difference]: With dead ends: 75 [2020-07-21 16:00:39,934 INFO L226 Difference]: Without dead ends: 71 [2020-07-21 16:00:39,935 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 137 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:00:39,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-07-21 16:00:39,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 56. [2020-07-21 16:00:39,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 16:00:39,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 90 transitions. [2020-07-21 16:00:39,948 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 90 transitions. Word has length 78 [2020-07-21 16:00:39,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:39,949 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 90 transitions. [2020-07-21 16:00:39,949 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 16:00:39,949 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 90 transitions. [2020-07-21 16:00:39,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-21 16:00:39,951 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:39,951 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:40,159 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:40,160 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:40,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:40,160 INFO L82 PathProgramCache]: Analyzing trace with hash 1583364703, now seen corresponding path program 1 times [2020-07-21 16:00:40,161 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:40,161 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [339972668] [2020-07-21 16:00:40,162 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:40,204 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:40,205 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:40,206 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 16:00:40,208 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:40,277 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 54 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 16:00:40,277 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:40,648 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:40,649 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:40,674 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2020-07-21 16:00:40,675 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [339972668] [2020-07-21 16:00:40,675 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:40,675 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-21 16:00:40,675 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1063090108] [2020-07-21 16:00:40,676 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 16:00:40,676 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:40,677 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 16:00:40,677 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:00:40,677 INFO L87 Difference]: Start difference. First operand 56 states and 90 transitions. Second operand 12 states. [2020-07-21 16:00:40,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:40,891 INFO L93 Difference]: Finished difference Result 114 states and 219 transitions. [2020-07-21 16:00:40,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:00:40,892 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 67 [2020-07-21 16:00:40,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:40,894 INFO L225 Difference]: With dead ends: 114 [2020-07-21 16:00:40,894 INFO L226 Difference]: Without dead ends: 64 [2020-07-21 16:00:40,896 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 119 SyntacticMatches, 7 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:00:40,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-21 16:00:40,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 61. [2020-07-21 16:00:40,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 16:00:40,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 101 transitions. [2020-07-21 16:00:40,908 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 101 transitions. Word has length 67 [2020-07-21 16:00:40,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:40,909 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 101 transitions. [2020-07-21 16:00:40,909 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 16:00:40,909 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 101 transitions. [2020-07-21 16:00:40,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-21 16:00:40,910 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:40,911 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:41,124 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:41,126 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:41,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:41,127 INFO L82 PathProgramCache]: Analyzing trace with hash -1763147687, now seen corresponding path program 2 times [2020-07-21 16:00:41,127 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:41,128 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1673912244] [2020-07-21 16:00:41,128 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:41,199 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:41,200 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:41,201 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:00:41,204 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:41,287 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 23 proven. 32 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-07-21 16:00:41,287 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:41,575 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:41,821 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:41,822 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:41,878 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:41,916 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 23 proven. 34 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2020-07-21 16:00:41,916 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1673912244] [2020-07-21 16:00:41,916 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:41,917 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-21 16:00:41,917 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [204389339] [2020-07-21 16:00:41,917 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 16:00:41,918 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:41,918 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 16:00:41,918 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:00:41,918 INFO L87 Difference]: Start difference. First operand 61 states and 101 transitions. Second operand 17 states. [2020-07-21 16:00:42,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:42,359 INFO L93 Difference]: Finished difference Result 131 states and 252 transitions. [2020-07-21 16:00:42,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 16:00:42,360 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 68 [2020-07-21 16:00:42,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:42,362 INFO L225 Difference]: With dead ends: 131 [2020-07-21 16:00:42,362 INFO L226 Difference]: Without dead ends: 76 [2020-07-21 16:00:42,364 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 116 SyntacticMatches, 11 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=124, Invalid=526, Unknown=0, NotChecked=0, Total=650 [2020-07-21 16:00:42,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-07-21 16:00:42,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 68. [2020-07-21 16:00:42,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-07-21 16:00:42,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 106 transitions. [2020-07-21 16:00:42,375 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 106 transitions. Word has length 68 [2020-07-21 16:00:42,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:42,376 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 106 transitions. [2020-07-21 16:00:42,376 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 16:00:42,376 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 106 transitions. [2020-07-21 16:00:42,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-07-21 16:00:42,378 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:42,378 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:42,591 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:42,592 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:42,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:42,592 INFO L82 PathProgramCache]: Analyzing trace with hash -1986769418, now seen corresponding path program 1 times [2020-07-21 16:00:42,592 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:42,593 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1833628989] [2020-07-21 16:00:42,593 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:42,648 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:42,648 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:42,650 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:00:42,652 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:42,753 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 39 proven. 53 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-21 16:00:42,754 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:43,210 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:43,211 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:43,258 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:43,259 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:43,293 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:43,298 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:43,510 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:43,558 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:43,560 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:43,614 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 39 proven. 57 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-07-21 16:00:43,614 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1833628989] [2020-07-21 16:00:43,614 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:43,614 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 21 [2020-07-21 16:00:43,615 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [168933696] [2020-07-21 16:00:43,615 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 16:00:43,615 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:43,616 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 16:00:43,616 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:00:43,616 INFO L87 Difference]: Start difference. First operand 68 states and 106 transitions. Second operand 21 states. [2020-07-21 16:00:44,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:44,435 INFO L93 Difference]: Finished difference Result 186 states and 366 transitions. [2020-07-21 16:00:44,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-21 16:00:44,435 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 82 [2020-07-21 16:00:44,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:44,441 INFO L225 Difference]: With dead ends: 186 [2020-07-21 16:00:44,441 INFO L226 Difference]: Without dead ends: 124 [2020-07-21 16:00:44,443 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 145 SyntacticMatches, 11 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=268, Invalid=1214, Unknown=0, NotChecked=0, Total=1482 [2020-07-21 16:00:44,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-07-21 16:00:44,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 110. [2020-07-21 16:00:44,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2020-07-21 16:00:44,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 179 transitions. [2020-07-21 16:00:44,490 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 179 transitions. Word has length 82 [2020-07-21 16:00:44,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:44,491 INFO L479 AbstractCegarLoop]: Abstraction has 110 states and 179 transitions. [2020-07-21 16:00:44,491 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 16:00:44,491 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 179 transitions. [2020-07-21 16:00:44,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-21 16:00:44,495 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:44,496 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:44,709 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:44,710 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:44,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:44,711 INFO L82 PathProgramCache]: Analyzing trace with hash -1156896337, now seen corresponding path program 3 times [2020-07-21 16:00:44,711 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:44,711 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [365072245] [2020-07-21 16:00:44,712 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:44,770 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:44,770 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:44,771 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 16:00:44,773 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:44,823 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 8 proven. 39 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2020-07-21 16:00:44,824 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:45,193 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:45,278 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:45,279 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:45,324 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:45,357 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 8 proven. 44 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2020-07-21 16:00:45,358 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [365072245] [2020-07-21 16:00:45,358 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:45,358 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 16:00:45,358 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [504866465] [2020-07-21 16:00:45,359 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 16:00:45,359 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:45,359 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 16:00:45,360 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 16:00:45,360 INFO L87 Difference]: Start difference. First operand 110 states and 179 transitions. Second operand 13 states. [2020-07-21 16:00:45,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:45,526 INFO L93 Difference]: Finished difference Result 114 states and 182 transitions. [2020-07-21 16:00:45,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 16:00:45,527 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 68 [2020-07-21 16:00:45,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:45,530 INFO L225 Difference]: With dead ends: 114 [2020-07-21 16:00:45,530 INFO L226 Difference]: Without dead ends: 110 [2020-07-21 16:00:45,531 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 118 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:00:45,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-07-21 16:00:45,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 102. [2020-07-21 16:00:45,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2020-07-21 16:00:45,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 159 transitions. [2020-07-21 16:00:45,543 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 159 transitions. Word has length 68 [2020-07-21 16:00:45,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:45,543 INFO L479 AbstractCegarLoop]: Abstraction has 102 states and 159 transitions. [2020-07-21 16:00:45,543 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 16:00:45,543 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 159 transitions. [2020-07-21 16:00:45,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-07-21 16:00:45,545 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:45,545 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:45,759 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:45,760 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:45,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:45,761 INFO L82 PathProgramCache]: Analyzing trace with hash 918304791, now seen corresponding path program 4 times [2020-07-21 16:00:45,761 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:45,762 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1717380154] [2020-07-21 16:00:45,762 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:45,818 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:45,819 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:45,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:00:45,822 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:45,904 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 78 proven. 33 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2020-07-21 16:00:45,905 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:46,311 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:46,367 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:46,402 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:46,551 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:46,552 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:46,595 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:46,637 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 78 proven. 35 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2020-07-21 16:00:46,638 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1717380154] [2020-07-21 16:00:46,638 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:46,638 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 19 [2020-07-21 16:00:46,638 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [78976257] [2020-07-21 16:00:46,639 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 16:00:46,639 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:46,639 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 16:00:46,640 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2020-07-21 16:00:46,640 INFO L87 Difference]: Start difference. First operand 102 states and 159 transitions. Second operand 19 states. [2020-07-21 16:00:47,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:47,161 INFO L93 Difference]: Finished difference Result 269 states and 520 transitions. [2020-07-21 16:00:47,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 16:00:47,167 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 94 [2020-07-21 16:00:47,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:47,170 INFO L225 Difference]: With dead ends: 269 [2020-07-21 16:00:47,171 INFO L226 Difference]: Without dead ends: 168 [2020-07-21 16:00:47,173 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 162 SyntacticMatches, 9 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=157, Invalid=713, Unknown=0, NotChecked=0, Total=870 [2020-07-21 16:00:47,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2020-07-21 16:00:47,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 144. [2020-07-21 16:00:47,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2020-07-21 16:00:47,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 247 transitions. [2020-07-21 16:00:47,192 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 247 transitions. Word has length 94 [2020-07-21 16:00:47,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:47,192 INFO L479 AbstractCegarLoop]: Abstraction has 144 states and 247 transitions. [2020-07-21 16:00:47,193 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 16:00:47,193 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 247 transitions. [2020-07-21 16:00:47,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-07-21 16:00:47,195 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:47,195 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:47,409 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:47,410 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:47,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:47,411 INFO L82 PathProgramCache]: Analyzing trace with hash -1676117994, now seen corresponding path program 2 times [2020-07-21 16:00:47,411 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:47,412 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1703974797] [2020-07-21 16:00:47,412 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:47,475 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:47,476 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:47,477 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 16:00:47,478 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:47,513 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 30 proven. 29 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2020-07-21 16:00:47,513 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:47,757 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:47,797 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:47,798 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:47,841 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:47,872 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 30 proven. 31 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2020-07-21 16:00:47,873 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1703974797] [2020-07-21 16:00:47,873 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:47,873 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-21 16:00:47,873 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1853038456] [2020-07-21 16:00:47,874 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 16:00:47,874 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:47,874 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 16:00:47,875 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-07-21 16:00:47,875 INFO L87 Difference]: Start difference. First operand 144 states and 247 transitions. Second operand 11 states. [2020-07-21 16:00:48,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:48,043 INFO L93 Difference]: Finished difference Result 167 states and 289 transitions. [2020-07-21 16:00:48,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:00:48,044 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 80 [2020-07-21 16:00:48,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:48,047 INFO L225 Difference]: With dead ends: 167 [2020-07-21 16:00:48,048 INFO L226 Difference]: Without dead ends: 163 [2020-07-21 16:00:48,051 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 144 SyntacticMatches, 7 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2020-07-21 16:00:48,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2020-07-21 16:00:48,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 157. [2020-07-21 16:00:48,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2020-07-21 16:00:48,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 272 transitions. [2020-07-21 16:00:48,072 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 272 transitions. Word has length 80 [2020-07-21 16:00:48,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:48,072 INFO L479 AbstractCegarLoop]: Abstraction has 157 states and 272 transitions. [2020-07-21 16:00:48,072 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 16:00:48,073 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 272 transitions. [2020-07-21 16:00:48,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-07-21 16:00:48,077 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:48,077 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:48,292 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:48,293 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:48,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:48,294 INFO L82 PathProgramCache]: Analyzing trace with hash 2019487259, now seen corresponding path program 3 times [2020-07-21 16:00:48,294 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:48,295 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [424940462] [2020-07-21 16:00:48,295 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:48,366 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:48,366 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:48,367 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:00:48,370 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:48,474 INFO L134 CoverageAnalysis]: Checked inductivity of 357 backedges. 177 proven. 90 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2020-07-21 16:00:48,475 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:49,217 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:49,218 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:49,273 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:49,563 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:49,611 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:49,664 INFO L134 CoverageAnalysis]: Checked inductivity of 357 backedges. 71 proven. 141 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2020-07-21 16:00:49,664 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [424940462] [2020-07-21 16:00:49,664 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:49,665 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 21 [2020-07-21 16:00:49,665 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1564113399] [2020-07-21 16:00:49,665 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 16:00:49,666 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:49,666 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 16:00:49,666 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:00:49,666 INFO L87 Difference]: Start difference. First operand 157 states and 272 transitions. Second operand 21 states. [2020-07-21 16:00:50,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:50,223 INFO L93 Difference]: Finished difference Result 369 states and 701 transitions. [2020-07-21 16:00:50,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-21 16:00:50,223 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 120 [2020-07-21 16:00:50,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:50,228 INFO L225 Difference]: With dead ends: 369 [2020-07-21 16:00:50,228 INFO L226 Difference]: Without dead ends: 218 [2020-07-21 16:00:50,231 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 213 SyntacticMatches, 11 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=187, Invalid=869, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 16:00:50,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2020-07-21 16:00:50,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 173. [2020-07-21 16:00:50,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173 states. [2020-07-21 16:00:50,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 306 transitions. [2020-07-21 16:00:50,251 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 306 transitions. Word has length 120 [2020-07-21 16:00:50,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:50,251 INFO L479 AbstractCegarLoop]: Abstraction has 173 states and 306 transitions. [2020-07-21 16:00:50,251 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 16:00:50,252 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 306 transitions. [2020-07-21 16:00:50,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-07-21 16:00:50,254 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:50,255 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:50,467 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:50,468 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:50,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:50,468 INFO L82 PathProgramCache]: Analyzing trace with hash -923530611, now seen corresponding path program 4 times [2020-07-21 16:00:50,468 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:50,468 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1826691778] [2020-07-21 16:00:50,469 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:50,542 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:50,542 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:50,544 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 16:00:50,546 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:50,598 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 55 proven. 14 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2020-07-21 16:00:50,598 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:50,812 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:50,812 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:50,853 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:50,906 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:50,958 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 55 proven. 16 refuted. 0 times theorem prover too weak. 106 trivial. 0 not checked. [2020-07-21 16:00:50,958 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1826691778] [2020-07-21 16:00:50,959 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:50,959 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-21 16:00:50,959 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [84944516] [2020-07-21 16:00:50,959 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 16:00:50,960 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:50,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 16:00:50,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-07-21 16:00:50,960 INFO L87 Difference]: Start difference. First operand 173 states and 306 transitions. Second operand 11 states. [2020-07-21 16:00:51,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:51,102 INFO L93 Difference]: Finished difference Result 191 states and 349 transitions. [2020-07-21 16:00:51,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:00:51,103 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 92 [2020-07-21 16:00:51,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:51,107 INFO L225 Difference]: With dead ends: 191 [2020-07-21 16:00:51,107 INFO L226 Difference]: Without dead ends: 187 [2020-07-21 16:00:51,108 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 169 SyntacticMatches, 7 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2020-07-21 16:00:51,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2020-07-21 16:00:51,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 176. [2020-07-21 16:00:51,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2020-07-21 16:00:51,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 316 transitions. [2020-07-21 16:00:51,143 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 316 transitions. Word has length 92 [2020-07-21 16:00:51,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:51,146 INFO L479 AbstractCegarLoop]: Abstraction has 176 states and 316 transitions. [2020-07-21 16:00:51,146 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 16:00:51,146 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 316 transitions. [2020-07-21 16:00:51,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2020-07-21 16:00:51,149 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:51,149 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 6, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:51,364 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:51,365 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:51,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:51,366 INFO L82 PathProgramCache]: Analyzing trace with hash -464279411, now seen corresponding path program 2 times [2020-07-21 16:00:51,366 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:51,366 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [774563755] [2020-07-21 16:00:51,367 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:51,443 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:51,443 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:51,445 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:00:51,447 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:51,556 INFO L134 CoverageAnalysis]: Checked inductivity of 332 backedges. 70 proven. 124 refuted. 0 times theorem prover too weak. 138 trivial. 0 not checked. [2020-07-21 16:00:51,556 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:52,089 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:52,090 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:52,139 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:52,519 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:52,520 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:52,612 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:52,613 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:52,665 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:52,666 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:52,724 INFO L134 CoverageAnalysis]: Checked inductivity of 332 backedges. 70 proven. 130 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2020-07-21 16:00:52,724 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [774563755] [2020-07-21 16:00:52,725 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:52,725 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 21 [2020-07-21 16:00:52,725 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [656035376] [2020-07-21 16:00:52,725 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 16:00:52,726 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:52,726 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 16:00:52,726 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:00:52,726 INFO L87 Difference]: Start difference. First operand 176 states and 316 transitions. Second operand 21 states. [2020-07-21 16:00:53,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:53,393 INFO L93 Difference]: Finished difference Result 399 states and 796 transitions. [2020-07-21 16:00:53,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-21 16:00:53,394 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 118 [2020-07-21 16:00:53,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:53,397 INFO L225 Difference]: With dead ends: 399 [2020-07-21 16:00:53,398 INFO L226 Difference]: Without dead ends: 226 [2020-07-21 16:00:53,400 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 206 SyntacticMatches, 15 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 159 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=219, Invalid=971, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 16:00:53,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2020-07-21 16:00:53,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 192. [2020-07-21 16:00:53,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2020-07-21 16:00:53,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 334 transitions. [2020-07-21 16:00:53,416 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 334 transitions. Word has length 118 [2020-07-21 16:00:53,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:53,416 INFO L479 AbstractCegarLoop]: Abstraction has 192 states and 334 transitions. [2020-07-21 16:00:53,416 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 16:00:53,416 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 334 transitions. [2020-07-21 16:00:53,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-21 16:00:53,419 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:53,419 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 7, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:53,634 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:53,635 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:53,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:53,636 INFO L82 PathProgramCache]: Analyzing trace with hash -1258440967, now seen corresponding path program 3 times [2020-07-21 16:00:53,636 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:53,637 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1206488319] [2020-07-21 16:00:53,637 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:53,725 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:53,726 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:53,727 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:00:53,729 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:53,787 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 21 proven. 117 refuted. 0 times theorem prover too weak. 191 trivial. 0 not checked. [2020-07-21 16:00:53,788 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:54,401 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:54,402 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:54,566 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:54,649 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:54,650 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:54,694 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:54,732 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 21 proven. 125 refuted. 0 times theorem prover too weak. 183 trivial. 0 not checked. [2020-07-21 16:00:54,732 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1206488319] [2020-07-21 16:00:54,732 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:54,732 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 16:00:54,733 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [395395202] [2020-07-21 16:00:54,733 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 16:00:54,733 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:54,733 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 16:00:54,734 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 16:00:54,734 INFO L87 Difference]: Start difference. First operand 192 states and 334 transitions. Second operand 15 states. [2020-07-21 16:00:54,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:54,929 INFO L93 Difference]: Finished difference Result 205 states and 355 transitions. [2020-07-21 16:00:54,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 16:00:54,930 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 117 [2020-07-21 16:00:54,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:54,933 INFO L225 Difference]: With dead ends: 205 [2020-07-21 16:00:54,933 INFO L226 Difference]: Without dead ends: 201 [2020-07-21 16:00:54,934 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 211 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-21 16:00:54,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2020-07-21 16:00:54,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 192. [2020-07-21 16:00:54,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2020-07-21 16:00:54,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 334 transitions. [2020-07-21 16:00:54,949 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 334 transitions. Word has length 117 [2020-07-21 16:00:54,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:54,949 INFO L479 AbstractCegarLoop]: Abstraction has 192 states and 334 transitions. [2020-07-21 16:00:54,949 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 16:00:54,949 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 334 transitions. [2020-07-21 16:00:54,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-07-21 16:00:54,952 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:54,952 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:55,166 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:55,167 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:55,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:55,168 INFO L82 PathProgramCache]: Analyzing trace with hash -650257977, now seen corresponding path program 5 times [2020-07-21 16:00:55,168 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:55,168 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2009817144] [2020-07-21 16:00:55,169 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:55,267 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:55,267 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:55,268 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:00:55,271 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:55,355 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 210 proven. 31 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-07-21 16:00:55,356 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:55,987 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:55,988 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:56,235 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:56,289 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:56,344 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 51 proven. 126 refuted. 0 times theorem prover too weak. 164 trivial. 0 not checked. [2020-07-21 16:00:56,345 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2009817144] [2020-07-21 16:00:56,345 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:56,345 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-21 16:00:56,346 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [432000790] [2020-07-21 16:00:56,348 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 16:00:56,349 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:56,349 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 16:00:56,349 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:00:56,349 INFO L87 Difference]: Start difference. First operand 192 states and 334 transitions. Second operand 17 states. [2020-07-21 16:00:56,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:56,720 INFO L93 Difference]: Finished difference Result 364 states and 644 transitions. [2020-07-21 16:00:56,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 16:00:56,721 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 120 [2020-07-21 16:00:56,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:56,723 INFO L225 Difference]: With dead ends: 364 [2020-07-21 16:00:56,723 INFO L226 Difference]: Without dead ends: 178 [2020-07-21 16:00:56,725 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 214 SyntacticMatches, 11 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=124, Invalid=526, Unknown=0, NotChecked=0, Total=650 [2020-07-21 16:00:56,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2020-07-21 16:00:56,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 176. [2020-07-21 16:00:56,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2020-07-21 16:00:56,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 287 transitions. [2020-07-21 16:00:56,740 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 287 transitions. Word has length 120 [2020-07-21 16:00:56,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:56,740 INFO L479 AbstractCegarLoop]: Abstraction has 176 states and 287 transitions. [2020-07-21 16:00:56,740 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 16:00:56,740 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 287 transitions. [2020-07-21 16:00:56,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2020-07-21 16:00:56,744 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:56,744 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 9, 9, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:56,957 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:56,958 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:56,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:56,960 INFO L82 PathProgramCache]: Analyzing trace with hash 495118725, now seen corresponding path program 6 times [2020-07-21 16:00:56,961 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:56,961 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1781834473] [2020-07-21 16:00:56,961 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:57,108 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:57,108 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:57,110 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 16:00:57,115 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:57,267 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 177 proven. 301 refuted. 0 times theorem prover too weak. 546 trivial. 0 not checked. [2020-07-21 16:00:57,267 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:58,175 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:58,282 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:58,341 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:58,407 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:58,842 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:58,936 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:58,993 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:59,071 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 177 proven. 311 refuted. 0 times theorem prover too weak. 536 trivial. 0 not checked. [2020-07-21 16:00:59,074 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1781834473] [2020-07-21 16:00:59,074 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:59,074 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 25 [2020-07-21 16:00:59,075 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [125509764] [2020-07-21 16:00:59,076 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 16:00:59,077 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:59,077 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 16:00:59,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=525, Unknown=0, NotChecked=0, Total=600 [2020-07-21 16:00:59,078 INFO L87 Difference]: Start difference. First operand 176 states and 287 transitions. Second operand 25 states. [2020-07-21 16:01:00,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:00,224 INFO L93 Difference]: Finished difference Result 428 states and 843 transitions. [2020-07-21 16:01:00,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-07-21 16:01:00,225 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 199 [2020-07-21 16:01:00,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:00,229 INFO L225 Difference]: With dead ends: 428 [2020-07-21 16:01:00,229 INFO L226 Difference]: Without dead ends: 256 [2020-07-21 16:01:00,233 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 420 GetRequests, 360 SyntacticMatches, 15 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 360 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=358, Invalid=1804, Unknown=0, NotChecked=0, Total=2162 [2020-07-21 16:01:00,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2020-07-21 16:01:00,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 219. [2020-07-21 16:01:00,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 219 states. [2020-07-21 16:01:00,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 386 transitions. [2020-07-21 16:01:00,256 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 386 transitions. Word has length 199 [2020-07-21 16:01:00,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:00,256 INFO L479 AbstractCegarLoop]: Abstraction has 219 states and 386 transitions. [2020-07-21 16:01:00,256 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 16:01:00,256 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 386 transitions. [2020-07-21 16:01:00,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-07-21 16:01:00,259 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:00,259 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:00,474 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:00,475 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:00,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:00,476 INFO L82 PathProgramCache]: Analyzing trace with hash -1245954009, now seen corresponding path program 7 times [2020-07-21 16:01:00,476 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:00,476 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [834650626] [2020-07-21 16:01:00,476 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:00,589 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:00,589 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:00,590 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:01:00,593 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:00,706 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 78 proven. 124 refuted. 0 times theorem prover too weak. 139 trivial. 0 not checked. [2020-07-21 16:01:00,707 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:01,258 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:01,259 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:01,316 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:01,316 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:01,747 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:01,748 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:01,871 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:01,927 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:01,928 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:01,975 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 78 proven. 130 refuted. 0 times theorem prover too weak. 133 trivial. 0 not checked. [2020-07-21 16:01:01,976 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [834650626] [2020-07-21 16:01:01,976 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:01,976 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 21 [2020-07-21 16:01:01,976 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [452329793] [2020-07-21 16:01:01,977 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 16:01:01,977 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:01,977 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 16:01:01,977 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=360, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:01:01,978 INFO L87 Difference]: Start difference. First operand 219 states and 386 transitions. Second operand 21 states. [2020-07-21 16:01:02,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:02,683 INFO L93 Difference]: Finished difference Result 423 states and 796 transitions. [2020-07-21 16:01:02,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-21 16:01:02,685 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 120 [2020-07-21 16:01:02,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:02,689 INFO L225 Difference]: With dead ends: 423 [2020-07-21 16:01:02,689 INFO L226 Difference]: Without dead ends: 208 [2020-07-21 16:01:02,692 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 211 SyntacticMatches, 15 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=186, Invalid=870, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 16:01:02,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2020-07-21 16:01:02,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 174. [2020-07-21 16:01:02,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2020-07-21 16:01:02,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 278 transitions. [2020-07-21 16:01:02,708 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 278 transitions. Word has length 120 [2020-07-21 16:01:02,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:02,709 INFO L479 AbstractCegarLoop]: Abstraction has 174 states and 278 transitions. [2020-07-21 16:01:02,709 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 16:01:02,709 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 278 transitions. [2020-07-21 16:01:02,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-21 16:01:02,712 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:02,712 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:02,925 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:02,926 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:02,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:02,927 INFO L82 PathProgramCache]: Analyzing trace with hash -77183713, now seen corresponding path program 8 times [2020-07-21 16:01:02,927 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:02,928 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1550615321] [2020-07-21 16:01:02,928 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:03,056 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:03,056 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:03,058 INFO L263 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 36 conjunts are in the unsatisfiable core [2020-07-21 16:01:03,060 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:03,309 INFO L134 CoverageAnalysis]: Checked inductivity of 346 backedges. 72 proven. 49 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2020-07-21 16:01:03,309 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:04,132 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2020-07-21 16:01:04,238 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2020-07-21 16:01:04,354 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2020-07-21 16:01:04,457 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2020-07-21 16:01:06,121 INFO L134 CoverageAnalysis]: Checked inductivity of 346 backedges. 72 proven. 49 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2020-07-21 16:01:06,121 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1550615321] [2020-07-21 16:01:06,121 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:06,121 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 28 [2020-07-21 16:01:06,122 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [605286247] [2020-07-21 16:01:06,122 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-07-21 16:01:06,123 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:06,123 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-07-21 16:01:06,123 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=652, Unknown=0, NotChecked=0, Total=756 [2020-07-21 16:01:06,123 INFO L87 Difference]: Start difference. First operand 174 states and 278 transitions. Second operand 28 states. [2020-07-21 16:01:06,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:06,305 INFO L93 Difference]: Finished difference Result 208 states and 357 transitions. [2020-07-21 16:01:06,306 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-07-21 16:01:06,306 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 121 [2020-07-21 16:01:06,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:06,309 INFO L225 Difference]: With dead ends: 208 [2020-07-21 16:01:06,309 INFO L226 Difference]: Without dead ends: 204 [2020-07-21 16:01:06,310 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 188 SyntacticMatches, 27 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 581 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=111, Invalid=701, Unknown=0, NotChecked=0, Total=812 [2020-07-21 16:01:06,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2020-07-21 16:01:06,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 197. [2020-07-21 16:01:06,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 197 states. [2020-07-21 16:01:06,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 340 transitions. [2020-07-21 16:01:06,327 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 340 transitions. Word has length 121 [2020-07-21 16:01:06,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:06,327 INFO L479 AbstractCegarLoop]: Abstraction has 197 states and 340 transitions. [2020-07-21 16:01:06,327 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-07-21 16:01:06,327 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 340 transitions. [2020-07-21 16:01:06,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2020-07-21 16:01:06,330 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:06,331 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 8, 7, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:06,543 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:06,544 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:06,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:06,545 INFO L82 PathProgramCache]: Analyzing trace with hash -2102107778, now seen corresponding path program 9 times [2020-07-21 16:01:06,545 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:06,545 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1116316038] [2020-07-21 16:01:06,545 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 16:01:06,686 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:06,687 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:06,688 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:01:06,691 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:06,787 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 262 proven. 67 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2020-07-21 16:01:06,787 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:07,577 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:07,974 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:07,975 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:08,086 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:08,087 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:08,140 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:08,141 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:08,186 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 91 proven. 156 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2020-07-21 16:01:08,187 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1116316038] [2020-07-21 16:01:08,187 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:08,187 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 19 [2020-07-21 16:01:08,187 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1290330725] [2020-07-21 16:01:08,188 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 16:01:08,188 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:08,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 16:01:08,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=290, Unknown=0, NotChecked=0, Total=342 [2020-07-21 16:01:08,189 INFO L87 Difference]: Start difference. First operand 197 states and 340 transitions. Second operand 19 states. [2020-07-21 16:01:08,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:08,727 INFO L93 Difference]: Finished difference Result 410 states and 770 transitions. [2020-07-21 16:01:08,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 16:01:08,728 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 136 [2020-07-21 16:01:08,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:08,732 INFO L225 Difference]: With dead ends: 410 [2020-07-21 16:01:08,732 INFO L226 Difference]: Without dead ends: 219 [2020-07-21 16:01:08,734 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 282 GetRequests, 241 SyntacticMatches, 13 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 110 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=161, Invalid=709, Unknown=0, NotChecked=0, Total=870 [2020-07-21 16:01:08,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2020-07-21 16:01:08,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 208. [2020-07-21 16:01:08,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 208 states. [2020-07-21 16:01:08,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 377 transitions. [2020-07-21 16:01:08,753 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 377 transitions. Word has length 136 [2020-07-21 16:01:08,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:08,755 INFO L479 AbstractCegarLoop]: Abstraction has 208 states and 377 transitions. [2020-07-21 16:01:08,755 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 16:01:08,756 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 377 transitions. [2020-07-21 16:01:08,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2020-07-21 16:01:08,759 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:08,760 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 8, 7, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:08,973 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:08,974 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:08,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:08,975 INFO L82 PathProgramCache]: Analyzing trace with hash -892586014, now seen corresponding path program 10 times [2020-07-21 16:01:08,975 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:08,975 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [809544242] [2020-07-21 16:01:08,976 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:09,133 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:09,134 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:09,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:01:09,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:09,250 INFO L134 CoverageAnalysis]: Checked inductivity of 633 backedges. 357 proven. 32 refuted. 0 times theorem prover too weak. 244 trivial. 0 not checked. [2020-07-21 16:01:09,250 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:10,201 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:10,202 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:10,493 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:10,542 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:10,543 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:10,587 INFO L134 CoverageAnalysis]: Checked inductivity of 633 backedges. 81 proven. 208 refuted. 0 times theorem prover too weak. 344 trivial. 0 not checked. [2020-07-21 16:01:10,587 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [809544242] [2020-07-21 16:01:10,587 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:10,588 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-21 16:01:10,588 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1910685879] [2020-07-21 16:01:10,588 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 16:01:10,588 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:10,588 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 16:01:10,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=229, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:01:10,589 INFO L87 Difference]: Start difference. First operand 208 states and 377 transitions. Second operand 17 states. [2020-07-21 16:01:11,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:11,067 INFO L93 Difference]: Finished difference Result 420 states and 786 transitions. [2020-07-21 16:01:11,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 16:01:11,067 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 160 [2020-07-21 16:01:11,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:11,070 INFO L225 Difference]: With dead ends: 420 [2020-07-21 16:01:11,070 INFO L226 Difference]: Without dead ends: 217 [2020-07-21 16:01:11,074 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 329 GetRequests, 293 SyntacticMatches, 11 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=137, Invalid=565, Unknown=0, NotChecked=0, Total=702 [2020-07-21 16:01:11,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2020-07-21 16:01:11,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 197. [2020-07-21 16:01:11,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 197 states. [2020-07-21 16:01:11,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 343 transitions. [2020-07-21 16:01:11,095 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 343 transitions. Word has length 160 [2020-07-21 16:01:11,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:11,095 INFO L479 AbstractCegarLoop]: Abstraction has 197 states and 343 transitions. [2020-07-21 16:01:11,095 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 16:01:11,096 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 343 transitions. [2020-07-21 16:01:11,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-21 16:01:11,098 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:11,098 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:11,312 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:11,313 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:11,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:11,313 INFO L82 PathProgramCache]: Analyzing trace with hash -1905629551, now seen corresponding path program 11 times [2020-07-21 16:01:11,314 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:11,314 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [57148367] [2020-07-21 16:01:11,316 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:11,538 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:11,538 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:11,541 INFO L263 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 36 conjunts are in the unsatisfiable core [2020-07-21 16:01:11,556 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:11,852 INFO L134 CoverageAnalysis]: Checked inductivity of 346 backedges. 16 proven. 105 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2020-07-21 16:01:11,852 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:12,723 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2020-07-21 16:01:12,929 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2020-07-21 16:01:13,031 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2020-07-21 16:01:14,967 INFO L134 CoverageAnalysis]: Checked inductivity of 346 backedges. 16 proven. 103 refuted. 0 times theorem prover too weak. 227 trivial. 0 not checked. [2020-07-21 16:01:14,967 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [57148367] [2020-07-21 16:01:14,968 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:14,968 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 26 [2020-07-21 16:01:14,968 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [749043947] [2020-07-21 16:01:14,968 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-21 16:01:14,968 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:14,969 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-21 16:01:14,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=558, Unknown=0, NotChecked=0, Total=650 [2020-07-21 16:01:14,969 INFO L87 Difference]: Start difference. First operand 197 states and 343 transitions. Second operand 26 states. [2020-07-21 16:01:15,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:15,200 INFO L93 Difference]: Finished difference Result 311 states and 708 transitions. [2020-07-21 16:01:15,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-21 16:01:15,201 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 121 [2020-07-21 16:01:15,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:15,207 INFO L225 Difference]: With dead ends: 311 [2020-07-21 16:01:15,207 INFO L226 Difference]: Without dead ends: 296 [2020-07-21 16:01:15,208 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 244 GetRequests, 190 SyntacticMatches, 27 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 564 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=118, Invalid=694, Unknown=0, NotChecked=0, Total=812 [2020-07-21 16:01:15,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2020-07-21 16:01:15,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 258. [2020-07-21 16:01:15,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 258 states. [2020-07-21 16:01:15,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 258 states to 258 states and 547 transitions. [2020-07-21 16:01:15,236 INFO L78 Accepts]: Start accepts. Automaton has 258 states and 547 transitions. Word has length 121 [2020-07-21 16:01:15,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:15,236 INFO L479 AbstractCegarLoop]: Abstraction has 258 states and 547 transitions. [2020-07-21 16:01:15,236 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-21 16:01:15,236 INFO L276 IsEmpty]: Start isEmpty. Operand 258 states and 547 transitions. [2020-07-21 16:01:15,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-21 16:01:15,240 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:15,240 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 6, 6, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:15,453 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:15,454 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:15,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:15,455 INFO L82 PathProgramCache]: Analyzing trace with hash -1540036056, now seen corresponding path program 12 times [2020-07-21 16:01:15,455 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:15,455 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1814979734] [2020-07-21 16:01:15,456 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:15,646 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:15,647 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-21 16:01:15,647 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 16:01:15,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 16:01:15,669 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 16:01:15,724 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 16:01:15,727 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 16:01:15,942 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:15,989 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 04:01:15 BoogieIcfgContainer [2020-07-21 16:01:15,989 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 16:01:15,990 INFO L168 Benchmark]: Toolchain (without parser) took 43887.29 ms. Allocated memory was 137.9 MB in the beginning and 513.8 MB in the end (delta: 375.9 MB). Free memory was 102.9 MB in the beginning and 339.9 MB in the end (delta: -237.0 MB). Peak memory consumption was 138.9 MB. Max. memory is 7.1 GB. [2020-07-21 16:01:15,991 INFO L168 Benchmark]: CDTParser took 0.70 ms. Allocated memory is still 137.9 MB. Free memory was 121.0 MB in the beginning and 120.8 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-21 16:01:15,991 INFO L168 Benchmark]: CACSL2BoogieTranslator took 258.19 ms. Allocated memory is still 137.9 MB. Free memory was 102.5 MB in the beginning and 93.0 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. [2020-07-21 16:01:15,991 INFO L168 Benchmark]: Boogie Preprocessor took 117.86 ms. Allocated memory was 137.9 MB in the beginning and 201.3 MB in the end (delta: 63.4 MB). Free memory was 93.0 MB in the beginning and 180.1 MB in the end (delta: -87.1 MB). Peak memory consumption was 14.5 MB. Max. memory is 7.1 GB. [2020-07-21 16:01:15,992 INFO L168 Benchmark]: RCFGBuilder took 295.17 ms. Allocated memory is still 201.3 MB. Free memory was 180.1 MB in the beginning and 167.4 MB in the end (delta: 12.8 MB). Peak memory consumption was 12.8 MB. Max. memory is 7.1 GB. [2020-07-21 16:01:15,992 INFO L168 Benchmark]: TraceAbstraction took 43209.26 ms. Allocated memory was 201.3 MB in the beginning and 513.8 MB in the end (delta: 312.5 MB). Free memory was 166.7 MB in the beginning and 339.9 MB in the end (delta: -173.2 MB). Peak memory consumption was 139.3 MB. Max. memory is 7.1 GB. [2020-07-21 16:01:15,994 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.70 ms. Allocated memory is still 137.9 MB. Free memory was 121.0 MB in the beginning and 120.8 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 258.19 ms. Allocated memory is still 137.9 MB. Free memory was 102.5 MB in the beginning and 93.0 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 117.86 ms. Allocated memory was 137.9 MB in the beginning and 201.3 MB in the end (delta: 63.4 MB). Free memory was 93.0 MB in the beginning and 180.1 MB in the end (delta: -87.1 MB). Peak memory consumption was 14.5 MB. Max. memory is 7.1 GB. * RCFGBuilder took 295.17 ms. Allocated memory is still 201.3 MB. Free memory was 180.1 MB in the beginning and 167.4 MB in the end (delta: 12.8 MB). Peak memory consumption was 12.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 43209.26 ms. Allocated memory was 201.3 MB in the beginning and 513.8 MB in the end (delta: 312.5 MB). Free memory was 166.7 MB in the beginning and 339.9 MB in the end (delta: -173.2 MB). Peak memory consumption was 139.3 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 39]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L36] int x = 5; VAL [x=5] [L37] CALL, EXPR fibo1(x) VAL [\old(n)=5] [L8] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L10] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=4] [L18] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L20] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=3] [L8] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L10] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=3, fibo2(n-1)=1, n=3] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=3, fibo2(n-1)=1, fibo2(n-2)=1, n=3] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=4, fibo1(n-1)=2, n=4] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=4, fibo1(n-1)=2, fibo1(n-2)=1, n=4] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=5, fibo2(n-1)=3, n=5] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=3] [L18] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L20] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=3, fibo1(n-1)=1, n=3] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=3, fibo1(n-1)=1, fibo1(n-2)=1, n=3] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=5, fibo2(n-1)=3, fibo2(n-2)=2, n=5] [L13] return fibo2(n-1) + fibo2(n-2); [L37] RET, EXPR fibo1(x) VAL [fibo1(x)=5, x=5] [L37] int result = fibo1(x); [L38] COND TRUE result == 5 VAL [result=5, x=5] [L39] __VERIFIER_error() VAL [result=5, x=5] - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 43.0s, OverallIterations: 27, TraceHistogramMax: 15, AutomataDifference: 9.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 747 SDtfs, 1329 SDslu, 5351 SDs, 0 SdLazy, 5731 SolverSat, 1334 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 4.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 4610 GetRequests, 3827 SyntacticMatches, 256 SemanticMatches, 527 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2751 ImplicationChecksByTransitivity, 7.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=258occurred in iteration=26, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.5s AutomataMinimizationTime, 26 MinimizatonAttempts, 363 StatesRemovedByMinimization, 25 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.2s SsaConstructionTime, 0.6s SatisfiabilityAnalysisTime, 24.8s InterpolantComputationTime, 2323 NumberOfCodeBlocks, 1662 NumberOfCodeBlocksAsserted, 42 NumberOfCheckSat, 4351 ConstructedInterpolants, 0 QuantifiedInterpolants, 926669 SizeOfPredicates, 137 NumberOfNonLiveVariables, 4006 ConjunctsInSsa, 318 ConjunctsInUnsatCore, 50 InterpolantComputations, 2 PerfectInterpolantSequences, 7989/11146 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...