/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 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_5-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 16:52:47,017 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 16:52:47,021 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 16:52:47,047 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 16:52:47,048 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 16:52:47,051 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 16:52:47,054 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 16:52:47,068 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 16:52:47,072 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 16:52:47,074 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 16:52:47,077 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 16:52:47,079 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 16:52:47,080 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 16:52:47,084 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 16:52:47,087 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 16:52:47,090 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 16:52:47,093 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 16:52:47,096 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 16:52:47,097 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 16:52:47,105 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 16:52:47,111 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 16:52:47,117 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 16:52:47,118 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 16:52:47,119 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 16:52:47,122 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 16:52:47,138 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 16:52:47,139 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 16:52:47,142 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 16:52:47,143 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 16:52:47,176 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 16:52:47,176 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 16:52:47,180 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 16:52:47,180 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 16:52:47,181 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 16:52:47,181 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 16:52:47,181 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 16:52:47,182 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 16:52:47,182 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 16:52:47,182 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 16:52:47,183 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 16:52:47,184 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 16:52:47,184 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 16:52:47,185 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 16:52:47,185 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 16:52:47,185 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 16:52:47,185 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 16:52:47,185 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 16:52:47,186 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 16:52:47,186 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 16:52:47,186 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 16:52:47,186 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 16:52:47,187 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 16:52:47,187 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 16:52:47,187 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 16:52:47,187 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 16:52:47,187 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:47,187 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 16:52:47,188 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 16:52:47,188 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 -> 4 [2020-07-20 16:52:47,562 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 16:52:47,593 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 16:52:47,598 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 16:52:47,602 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 16:52:47,602 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 16:52:47,603 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_5-1.c [2020-07-20 16:52:47,714 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7693e5554/f5fa08f4acf44847a43a3f7b53f68684/FLAG3baff1d08 [2020-07-20 16:52:48,341 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 16:52:48,342 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_5-1.c [2020-07-20 16:52:48,354 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7693e5554/f5fa08f4acf44847a43a3f7b53f68684/FLAG3baff1d08 [2020-07-20 16:52:48,670 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7693e5554/f5fa08f4acf44847a43a3f7b53f68684 [2020-07-20 16:52:48,684 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 16:52:48,688 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 16:52:48,690 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 16:52:48,690 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 16:52:48,694 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 16:52:48,696 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:52:48" (1/1) ... [2020-07-20 16:52:48,700 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@140172bb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:52:48, skipping insertion in model container [2020-07-20 16:52:48,701 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:52:48" (1/1) ... [2020-07-20 16:52:48,711 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 16:52:48,733 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 16:52:48,931 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:52:48,937 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 16:52:48,959 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:52:48,978 INFO L208 MainTranslator]: Completed translation [2020-07-20 16:52:48,979 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:52:48 WrapperNode [2020-07-20 16:52:48,979 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 16:52:48,980 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 16:52:48,981 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 16:52:48,981 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 16:52:48,999 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:52:48" (1/1) ... [2020-07-20 16:52:49,000 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:52:48" (1/1) ... [2020-07-20 16:52:49,006 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:52:48" (1/1) ... [2020-07-20 16:52:49,007 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:52:48" (1/1) ... [2020-07-20 16:52:49,013 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:52:48" (1/1) ... [2020-07-20 16:52:49,016 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:52:48" (1/1) ... [2020-07-20 16:52:49,018 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:52:48" (1/1) ... [2020-07-20 16:52:49,020 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 16:52:49,021 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 16:52:49,021 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 16:52:49,021 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 16:52:49,023 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:52:48" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 16:52:49,210 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 16:52:49,210 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 16:52:49,211 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-20 16:52:49,211 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-20 16:52:49,211 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 16:52:49,212 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 16:52:49,212 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 16:52:49,214 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-20 16:52:49,214 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-20 16:52:49,214 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 16:52:49,216 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 16:52:49,216 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 16:52:49,466 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 16:52:49,466 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 16:52:49,472 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:52:49 BoogieIcfgContainer [2020-07-20 16:52:49,472 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 16:52:49,474 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 16:52:49,474 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 16:52:49,477 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 16:52:49,478 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 04:52:48" (1/3) ... [2020-07-20 16:52:49,479 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4e03d9a6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:52:49, skipping insertion in model container [2020-07-20 16:52:49,479 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:52:48" (2/3) ... [2020-07-20 16:52:49,480 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4e03d9a6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:52:49, skipping insertion in model container [2020-07-20 16:52:49,480 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:52:49" (3/3) ... [2020-07-20 16:52:49,483 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_5-1.c [2020-07-20 16:52:49,496 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 16:52:49,506 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 16:52:49,523 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 16:52:49,554 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 16:52:49,554 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 16:52:49,554 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 16:52:49,554 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 16:52:49,555 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 16:52:49,555 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 16:52:49,555 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 16:52:49,555 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 16:52:49,576 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-20 16:52:49,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 16:52:49,584 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:52:49,585 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:52:49,586 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:52:49,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:52:49,592 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-20 16:52:49,601 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:52:49,601 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2089357262] [2020-07-20 16:52:49,601 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:49,679 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:52:49,680 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:52:49,683 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 16:52:49,690 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:52:49,842 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 16:52:49,842 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:52:49,849 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2089357262] [2020-07-20 16:52:49,851 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:52:49,851 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 16:52:49,853 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2048401217] [2020-07-20 16:52:49,859 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 16:52:49,860 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:52:49,875 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 16:52:49,876 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 16:52:49,880 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-20 16:52:50,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:52:50,033 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-20 16:52:50,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 16:52:50,036 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 16:52:50,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:52:50,049 INFO L225 Difference]: With dead ends: 44 [2020-07-20 16:52:50,049 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 16:52:50,054 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 16:52:50,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 16:52:50,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-20 16:52:50,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 16:52:50,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 16:52:50,108 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-20 16:52:50,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:52:50,108 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 16:52:50,108 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 16:52:50,109 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 16:52:50,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 16:52:50,111 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:52:50,111 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:52:50,318 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:50,320 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:52:50,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:52:50,322 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-20 16:52:50,322 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:52:50,323 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1906594447] [2020-07-20 16:52:50,323 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:50,377 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:52:50,377 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:52:50,380 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 16:52:50,382 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:52:50,441 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 16:52:50,442 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:52:50,442 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1906594447] [2020-07-20 16:52:50,443 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:52:50,443 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 16:52:50,444 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1522204205] [2020-07-20 16:52:50,448 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 16:52:50,449 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:52:50,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 16:52:50,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 16:52:50,450 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-20 16:52:50,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:52:50,540 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-20 16:52:50,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 16:52:50,542 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 16:52:50,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:52:50,543 INFO L225 Difference]: With dead ends: 36 [2020-07-20 16:52:50,544 INFO L226 Difference]: Without dead ends: 32 [2020-07-20 16:52:50,545 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 16:52:50,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-20 16:52:50,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-20 16:52:50,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 16:52:50,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 16:52:50,557 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-20 16:52:50,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:52:50,557 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 16:52:50,558 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 16:52:50,558 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 16:52:50,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 16:52:50,560 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:52:50,560 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] [2020-07-20 16:52:50,774 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:50,774 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:52:50,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:52:50,776 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-20 16:52:50,777 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:52:50,777 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1694647938] [2020-07-20 16:52:50,778 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:50,823 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:52:50,824 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:52:50,825 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 16:52:50,829 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:52:50,936 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 16:52:50,937 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:52:51,189 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:51,194 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:51,272 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 16:52:51,273 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1694647938] [2020-07-20 16:52:51,273 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:52:51,273 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 16:52:51,274 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [759040330] [2020-07-20 16:52:51,275 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 16:52:51,275 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:52:51,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 16:52:51,276 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 16:52:51,276 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-20 16:52:51,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:52:51,496 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-20 16:52:51,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 16:52:51,498 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-20 16:52:51,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:52:51,502 INFO L225 Difference]: With dead ends: 41 [2020-07-20 16:52:51,504 INFO L226 Difference]: Without dead ends: 37 [2020-07-20 16:52:51,506 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 [2020-07-20 16:52:51,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-20 16:52:51,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-20 16:52:51,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 16:52:51,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 16:52:51,535 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-20 16:52:51,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:52:51,535 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 16:52:51,536 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 16:52:51,536 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 16:52:51,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 16:52:51,538 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:52:51,538 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] [2020-07-20 16:52:51,755 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:51,756 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:52:51,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:52:51,757 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-20 16:52:51,757 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:52:51,757 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [76878920] [2020-07-20 16:52:51,758 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:51,800 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:52:51,801 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:52:51,802 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 16:52:51,804 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:52:51,856 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 16:52:51,856 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:52:52,022 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:52,024 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:52,065 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 16:52:52,066 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [76878920] [2020-07-20 16:52:52,066 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:52:52,066 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 16:52:52,067 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [376894058] [2020-07-20 16:52:52,067 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 16:52:52,068 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:52:52,068 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 16:52:52,068 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 16:52:52,069 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-20 16:52:52,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:52:52,218 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-20 16:52:52,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 16:52:52,219 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-20 16:52:52,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:52:52,222 INFO L225 Difference]: With dead ends: 46 [2020-07-20 16:52:52,222 INFO L226 Difference]: Without dead ends: 42 [2020-07-20 16:52:52,223 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 [2020-07-20 16:52:52,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-20 16:52:52,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-20 16:52:52,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 16:52:52,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 16:52:52,234 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-20 16:52:52,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:52:52,234 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 16:52:52,234 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 16:52:52,235 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 16:52:52,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 16:52:52,237 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:52:52,237 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] [2020-07-20 16:52:52,450 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:52,452 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:52:52,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:52:52,453 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-20 16:52:52,453 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:52:52,454 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2055326339] [2020-07-20 16:52:52,454 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:52,487 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:52:52,487 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:52:52,488 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:52:52,491 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:52:52,563 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 16:52:52,563 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:52:52,866 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:52,950 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:52,952 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:53,005 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 16:52:53,006 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2055326339] [2020-07-20 16:52:53,006 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:52:53,006 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 16:52:53,007 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1133974216] [2020-07-20 16:52:53,007 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:52:53,008 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:52:53,008 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:52:53,008 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:52:53,009 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-20 16:52:53,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:52:53,229 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-20 16:52:53,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:52:53,230 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-20 16:52:53,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:52:53,232 INFO L225 Difference]: With dead ends: 51 [2020-07-20 16:52:53,232 INFO L226 Difference]: Without dead ends: 47 [2020-07-20 16:52:53,233 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 63 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-20 16:52:53,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-20 16:52:53,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-20 16:52:53,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-20 16:52:53,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-20 16:52:53,243 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-20 16:52:53,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:52:53,244 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-20 16:52:53,244 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:52:53,244 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-20 16:52:53,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-20 16:52:53,246 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:52:53,246 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] [2020-07-20 16:52:53,459 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:53,460 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:52:53,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:52:53,461 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-20 16:52:53,462 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:52:53,462 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [267381478] [2020-07-20 16:52:53,463 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:53,498 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:52:53,499 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:52:53,500 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:52:53,503 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:52:53,574 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 16:52:53,574 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:52:53,863 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:53,864 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:53,903 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 16:52:53,903 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [267381478] [2020-07-20 16:52:53,904 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:52:53,904 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-20 16:52:53,904 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1435017019] [2020-07-20 16:52:53,905 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:52:53,905 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:52:53,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:52:53,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:52:53,906 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 12 states. [2020-07-20 16:52:54,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:52:54,239 INFO L93 Difference]: Finished difference Result 84 states and 136 transitions. [2020-07-20 16:52:54,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:52:54,240 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-07-20 16:52:54,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:52:54,243 INFO L225 Difference]: With dead ends: 84 [2020-07-20 16:52:54,243 INFO L226 Difference]: Without dead ends: 50 [2020-07-20 16:52:54,254 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 [2020-07-20 16:52:54,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-07-20 16:52:54,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 47. [2020-07-20 16:52:54,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-07-20 16:52:54,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 67 transitions. [2020-07-20 16:52:54,309 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 67 transitions. Word has length 40 [2020-07-20 16:52:54,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:52:54,310 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 67 transitions. [2020-07-20 16:52:54,310 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:52:54,311 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 67 transitions. [2020-07-20 16:52:54,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-20 16:52:54,321 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:52:54,322 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] [2020-07-20 16:52:54,522 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:54,523 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:52:54,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:52:54,524 INFO L82 PathProgramCache]: Analyzing trace with hash 208191613, now seen corresponding path program 1 times [2020-07-20 16:52:54,524 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:52:54,525 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [193524375] [2020-07-20 16:52:54,525 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:54,590 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:52:54,591 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:52:54,592 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:52:54,603 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:52:54,663 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-20 16:52:54,664 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:52:54,918 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:54,972 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:55,022 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 16:52:55,023 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [193524375] [2020-07-20 16:52:55,023 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:52:55,024 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 16:52:55,024 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [739625812] [2020-07-20 16:52:55,024 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:52:55,025 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:52:55,025 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:52:55,025 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:52:55,025 INFO L87 Difference]: Start difference. First operand 47 states and 67 transitions. Second operand 12 states. [2020-07-20 16:52:55,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:52:55,222 INFO L93 Difference]: Finished difference Result 63 states and 99 transitions. [2020-07-20 16:52:55,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:52:55,222 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 41 [2020-07-20 16:52:55,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:52:55,225 INFO L225 Difference]: With dead ends: 63 [2020-07-20 16:52:55,225 INFO L226 Difference]: Without dead ends: 59 [2020-07-20 16:52:55,227 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 [2020-07-20 16:52:55,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-07-20 16:52:55,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 51. [2020-07-20 16:52:55,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-20 16:52:55,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 77 transitions. [2020-07-20 16:52:55,240 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 77 transitions. Word has length 41 [2020-07-20 16:52:55,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:52:55,240 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 77 transitions. [2020-07-20 16:52:55,240 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:52:55,241 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 77 transitions. [2020-07-20 16:52:55,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-07-20 16:52:55,244 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:52:55,244 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] [2020-07-20 16:52:55,458 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:55,459 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:52:55,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:52:55,459 INFO L82 PathProgramCache]: Analyzing trace with hash -1291563674, now seen corresponding path program 1 times [2020-07-20 16:52:55,460 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:52:55,460 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1023904232] [2020-07-20 16:52:55,461 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:55,500 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:52:55,501 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:52:55,502 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 16:52:55,504 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:52:55,566 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-20 16:52:55,566 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:52:55,749 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:55,793 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:55,840 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-20 16:52:55,841 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1023904232] [2020-07-20 16:52:55,841 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:52:55,841 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 16:52:55,842 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1534692617] [2020-07-20 16:52:55,849 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 16:52:55,849 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:52:55,850 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 16:52:55,850 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 16:52:55,850 INFO L87 Difference]: Start difference. First operand 51 states and 77 transitions. Second operand 10 states. [2020-07-20 16:52:56,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:52:56,004 INFO L93 Difference]: Finished difference Result 65 states and 105 transitions. [2020-07-20 16:52:56,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 16:52:56,006 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 53 [2020-07-20 16:52:56,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:52:56,008 INFO L225 Difference]: With dead ends: 65 [2020-07-20 16:52:56,008 INFO L226 Difference]: Without dead ends: 61 [2020-07-20 16:52:56,009 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 [2020-07-20 16:52:56,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-07-20 16:52:56,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 53. [2020-07-20 16:52:56,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-07-20 16:52:56,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 82 transitions. [2020-07-20 16:52:56,023 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 82 transitions. Word has length 53 [2020-07-20 16:52:56,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:52:56,023 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 82 transitions. [2020-07-20 16:52:56,023 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 16:52:56,024 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 82 transitions. [2020-07-20 16:52:56,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-07-20 16:52:56,026 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:52:56,027 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] [2020-07-20 16:52:56,237 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:56,238 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:52:56,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:52:56,238 INFO L82 PathProgramCache]: Analyzing trace with hash 736840020, now seen corresponding path program 2 times [2020-07-20 16:52:56,239 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:52:56,240 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1325044335] [2020-07-20 16:52:56,240 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:56,303 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:52:56,303 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:52:56,304 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:52:56,311 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:52:56,384 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 9 proven. 55 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-07-20 16:52:56,384 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:52:56,798 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:56,799 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:56,918 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:56,919 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:56,964 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:56,965 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:57,016 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 9 proven. 59 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2020-07-20 16:52:57,016 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1325044335] [2020-07-20 16:52:57,017 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:52:57,017 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 16:52:57,017 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2025962761] [2020-07-20 16:52:57,018 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 16:52:57,018 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:52:57,019 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 16:52:57,019 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 16:52:57,019 INFO L87 Difference]: Start difference. First operand 53 states and 82 transitions. Second operand 14 states. [2020-07-20 16:52:57,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:52:57,208 INFO L93 Difference]: Finished difference Result 75 states and 134 transitions. [2020-07-20 16:52:57,209 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:52:57,209 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 78 [2020-07-20 16:52:57,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:52:57,211 INFO L225 Difference]: With dead ends: 75 [2020-07-20 16:52:57,211 INFO L226 Difference]: Without dead ends: 71 [2020-07-20 16:52:57,212 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 137 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 16:52:57,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-07-20 16:52:57,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 56. [2020-07-20 16:52:57,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 16:52:57,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 90 transitions. [2020-07-20 16:52:57,237 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 90 transitions. Word has length 78 [2020-07-20 16:52:57,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:52:57,238 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 90 transitions. [2020-07-20 16:52:57,238 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 16:52:57,238 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 90 transitions. [2020-07-20 16:52:57,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-20 16:52:57,243 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:52:57,243 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] [2020-07-20 16:52:57,443 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:57,444 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:52:57,445 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:52:57,445 INFO L82 PathProgramCache]: Analyzing trace with hash 1583364703, now seen corresponding path program 1 times [2020-07-20 16:52:57,445 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:52:57,446 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1787800954] [2020-07-20 16:52:57,447 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:57,488 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:52:57,488 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:52:57,489 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:52:57,491 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:52:57,550 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 54 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-20 16:52:57,550 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:52:57,887 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:57,889 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:57,922 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2020-07-20 16:52:57,922 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1787800954] [2020-07-20 16:52:57,923 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:52:57,923 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-20 16:52:57,923 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [925238315] [2020-07-20 16:52:57,924 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:52:57,925 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:52:57,925 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:52:57,926 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:52:57,926 INFO L87 Difference]: Start difference. First operand 56 states and 90 transitions. Second operand 12 states. [2020-07-20 16:52:58,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:52:58,162 INFO L93 Difference]: Finished difference Result 114 states and 219 transitions. [2020-07-20 16:52:58,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:52:58,163 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 67 [2020-07-20 16:52:58,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:52:58,165 INFO L225 Difference]: With dead ends: 114 [2020-07-20 16:52:58,166 INFO L226 Difference]: Without dead ends: 64 [2020-07-20 16:52:58,170 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 [2020-07-20 16:52:58,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-20 16:52:58,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 61. [2020-07-20 16:52:58,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 16:52:58,194 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 101 transitions. [2020-07-20 16:52:58,195 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 101 transitions. Word has length 67 [2020-07-20 16:52:58,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:52:58,195 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 101 transitions. [2020-07-20 16:52:58,195 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:52:58,196 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 101 transitions. [2020-07-20 16:52:58,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-20 16:52:58,201 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:52:58,201 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] [2020-07-20 16:52:58,404 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:58,405 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:52:58,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:52:58,406 INFO L82 PathProgramCache]: Analyzing trace with hash -1763147687, now seen corresponding path program 2 times [2020-07-20 16:52:58,407 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:52:58,407 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1260123018] [2020-07-20 16:52:58,407 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:58,466 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:52:58,466 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:52:58,468 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:52:58,473 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:52:58,567 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 23 proven. 32 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-07-20 16:52:58,567 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:52:58,874 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:59,117 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:59,118 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:59,177 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:59,217 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 23 proven. 34 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2020-07-20 16:52:59,218 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1260123018] [2020-07-20 16:52:59,218 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:52:59,219 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-20 16:52:59,219 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2058020566] [2020-07-20 16:52:59,220 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 16:52:59,220 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:52:59,220 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 16:52:59,221 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:52:59,221 INFO L87 Difference]: Start difference. First operand 61 states and 101 transitions. Second operand 17 states. [2020-07-20 16:52:59,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:52:59,725 INFO L93 Difference]: Finished difference Result 131 states and 252 transitions. [2020-07-20 16:52:59,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 16:52:59,725 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 68 [2020-07-20 16:52:59,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:52:59,727 INFO L225 Difference]: With dead ends: 131 [2020-07-20 16:52:59,727 INFO L226 Difference]: Without dead ends: 76 [2020-07-20 16:52:59,729 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 [2020-07-20 16:52:59,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-07-20 16:52:59,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 68. [2020-07-20 16:52:59,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-07-20 16:52:59,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 106 transitions. [2020-07-20 16:52:59,746 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 106 transitions. Word has length 68 [2020-07-20 16:52:59,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:52:59,746 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 106 transitions. [2020-07-20 16:52:59,746 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 16:52:59,746 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 106 transitions. [2020-07-20 16:52:59,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-07-20 16:52:59,752 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:52:59,752 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] [2020-07-20 16:52:59,967 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:59,968 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:52:59,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:52:59,969 INFO L82 PathProgramCache]: Analyzing trace with hash -1986769418, now seen corresponding path program 1 times [2020-07-20 16:52:59,969 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:52:59,969 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [668377842] [2020-07-20 16:52:59,970 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:00,046 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:53:00,046 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:53:00,048 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:53:00,052 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:53:00,179 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 39 proven. 53 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-20 16:53:00,180 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:53:00,672 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:00,673 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:00,726 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:00,728 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:00,771 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:00,778 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:00,999 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:01,061 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:01,065 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:01,127 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 39 proven. 57 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-07-20 16:53:01,127 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [668377842] [2020-07-20 16:53:01,128 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:53:01,128 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 21 [2020-07-20 16:53:01,128 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1014242760] [2020-07-20 16:53:01,129 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 16:53:01,129 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:53:01,129 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 16:53:01,130 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:53:01,130 INFO L87 Difference]: Start difference. First operand 68 states and 106 transitions. Second operand 21 states. [2020-07-20 16:53:02,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:53:02,062 INFO L93 Difference]: Finished difference Result 186 states and 366 transitions. [2020-07-20 16:53:02,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-20 16:53:02,063 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 82 [2020-07-20 16:53:02,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:53:02,068 INFO L225 Difference]: With dead ends: 186 [2020-07-20 16:53:02,069 INFO L226 Difference]: Without dead ends: 124 [2020-07-20 16:53:02,071 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 145 SyntacticMatches, 11 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=268, Invalid=1214, Unknown=0, NotChecked=0, Total=1482 [2020-07-20 16:53:02,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-07-20 16:53:02,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 110. [2020-07-20 16:53:02,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2020-07-20 16:53:02,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 179 transitions. [2020-07-20 16:53:02,091 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 179 transitions. Word has length 82 [2020-07-20 16:53:02,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:53:02,092 INFO L479 AbstractCegarLoop]: Abstraction has 110 states and 179 transitions. [2020-07-20 16:53:02,092 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 16:53:02,092 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 179 transitions. [2020-07-20 16:53:02,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-20 16:53:02,094 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:53:02,094 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] [2020-07-20 16:53:02,309 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:02,310 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:53:02,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:53:02,310 INFO L82 PathProgramCache]: Analyzing trace with hash -1156896337, now seen corresponding path program 3 times [2020-07-20 16:53:02,311 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:53:02,311 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1869420306] [2020-07-20 16:53:02,312 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:02,374 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:53:02,374 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:53:02,375 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:53:02,376 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:53:02,430 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 8 proven. 39 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2020-07-20 16:53:02,431 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:53:02,820 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:02,915 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:02,916 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:02,975 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:03,021 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 8 proven. 44 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2020-07-20 16:53:03,021 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1869420306] [2020-07-20 16:53:03,022 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:53:03,022 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 16:53:03,022 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1254957216] [2020-07-20 16:53:03,022 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 16:53:03,023 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:53:03,023 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 16:53:03,023 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 16:53:03,023 INFO L87 Difference]: Start difference. First operand 110 states and 179 transitions. Second operand 13 states. [2020-07-20 16:53:03,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:53:03,239 INFO L93 Difference]: Finished difference Result 114 states and 182 transitions. [2020-07-20 16:53:03,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:53:03,240 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 68 [2020-07-20 16:53:03,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:53:03,244 INFO L225 Difference]: With dead ends: 114 [2020-07-20 16:53:03,244 INFO L226 Difference]: Without dead ends: 110 [2020-07-20 16:53:03,246 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 [2020-07-20 16:53:03,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-07-20 16:53:03,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 102. [2020-07-20 16:53:03,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2020-07-20 16:53:03,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 159 transitions. [2020-07-20 16:53:03,274 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 159 transitions. Word has length 68 [2020-07-20 16:53:03,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:53:03,275 INFO L479 AbstractCegarLoop]: Abstraction has 102 states and 159 transitions. [2020-07-20 16:53:03,275 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 16:53:03,275 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 159 transitions. [2020-07-20 16:53:03,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-07-20 16:53:03,279 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:53:03,280 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] [2020-07-20 16:53:03,492 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:03,493 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:53:03,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:53:03,494 INFO L82 PathProgramCache]: Analyzing trace with hash 918304791, now seen corresponding path program 4 times [2020-07-20 16:53:03,494 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:53:03,494 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1921883573] [2020-07-20 16:53:03,494 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:03,582 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:53:03,583 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:53:03,585 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:53:03,588 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:53:03,694 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 78 proven. 33 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2020-07-20 16:53:03,695 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:53:04,148 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:04,210 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:04,249 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:04,398 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:04,399 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:04,462 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:04,517 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 78 proven. 35 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2020-07-20 16:53:04,517 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1921883573] [2020-07-20 16:53:04,518 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:53:04,518 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 19 [2020-07-20 16:53:04,518 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [879684927] [2020-07-20 16:53:04,519 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 16:53:04,519 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:53:04,520 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 16:53:04,520 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2020-07-20 16:53:04,520 INFO L87 Difference]: Start difference. First operand 102 states and 159 transitions. Second operand 19 states. [2020-07-20 16:53:05,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:53:05,099 INFO L93 Difference]: Finished difference Result 269 states and 520 transitions. [2020-07-20 16:53:05,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 16:53:05,100 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 94 [2020-07-20 16:53:05,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:53:05,103 INFO L225 Difference]: With dead ends: 269 [2020-07-20 16:53:05,103 INFO L226 Difference]: Without dead ends: 168 [2020-07-20 16:53:05,106 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 162 SyntacticMatches, 9 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=157, Invalid=713, Unknown=0, NotChecked=0, Total=870 [2020-07-20 16:53:05,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2020-07-20 16:53:05,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 144. [2020-07-20 16:53:05,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2020-07-20 16:53:05,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 247 transitions. [2020-07-20 16:53:05,125 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 247 transitions. Word has length 94 [2020-07-20 16:53:05,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:53:05,125 INFO L479 AbstractCegarLoop]: Abstraction has 144 states and 247 transitions. [2020-07-20 16:53:05,126 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 16:53:05,126 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 247 transitions. [2020-07-20 16:53:05,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-07-20 16:53:05,128 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:53:05,129 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] [2020-07-20 16:53:05,342 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:05,343 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:53:05,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:53:05,343 INFO L82 PathProgramCache]: Analyzing trace with hash -1676117994, now seen corresponding path program 2 times [2020-07-20 16:53:05,343 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:53:05,343 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [268614429] [2020-07-20 16:53:05,343 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:05,406 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:53:05,407 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:53:05,408 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:53:05,410 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:53:05,449 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 30 proven. 29 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2020-07-20 16:53:05,449 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:53:05,715 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:05,757 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:05,758 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:05,807 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:05,839 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 30 proven. 31 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2020-07-20 16:53:05,840 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [268614429] [2020-07-20 16:53:05,840 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:53:05,840 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-20 16:53:05,840 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [235072695] [2020-07-20 16:53:05,841 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 16:53:05,841 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:53:05,841 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 16:53:05,842 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-07-20 16:53:05,842 INFO L87 Difference]: Start difference. First operand 144 states and 247 transitions. Second operand 11 states. [2020-07-20 16:53:06,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:53:06,021 INFO L93 Difference]: Finished difference Result 167 states and 289 transitions. [2020-07-20 16:53:06,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:53:06,022 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 80 [2020-07-20 16:53:06,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:53:06,026 INFO L225 Difference]: With dead ends: 167 [2020-07-20 16:53:06,027 INFO L226 Difference]: Without dead ends: 163 [2020-07-20 16:53:06,031 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 [2020-07-20 16:53:06,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2020-07-20 16:53:06,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 157. [2020-07-20 16:53:06,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2020-07-20 16:53:06,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 272 transitions. [2020-07-20 16:53:06,082 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 272 transitions. Word has length 80 [2020-07-20 16:53:06,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:53:06,084 INFO L479 AbstractCegarLoop]: Abstraction has 157 states and 272 transitions. [2020-07-20 16:53:06,084 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 16:53:06,085 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 272 transitions. [2020-07-20 16:53:06,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-07-20 16:53:06,089 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:53:06,090 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] [2020-07-20 16:53:06,299 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:06,300 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:53:06,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:53:06,300 INFO L82 PathProgramCache]: Analyzing trace with hash 2019487259, now seen corresponding path program 3 times [2020-07-20 16:53:06,300 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:53:06,301 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1004778731] [2020-07-20 16:53:06,301 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:06,368 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:53:06,368 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:53:06,370 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:53:06,372 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:53:06,484 INFO L134 CoverageAnalysis]: Checked inductivity of 357 backedges. 177 proven. 90 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2020-07-20 16:53:06,484 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:53:07,293 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:07,294 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:07,351 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:07,621 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:07,691 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:07,747 INFO L134 CoverageAnalysis]: Checked inductivity of 357 backedges. 71 proven. 141 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2020-07-20 16:53:07,748 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1004778731] [2020-07-20 16:53:07,748 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:53:07,748 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 21 [2020-07-20 16:53:07,749 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [256661607] [2020-07-20 16:53:07,749 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 16:53:07,750 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:53:07,750 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 16:53:07,751 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:53:07,751 INFO L87 Difference]: Start difference. First operand 157 states and 272 transitions. Second operand 21 states. [2020-07-20 16:53:08,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:53:08,359 INFO L93 Difference]: Finished difference Result 369 states and 701 transitions. [2020-07-20 16:53:08,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-20 16:53:08,360 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 120 [2020-07-20 16:53:08,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:53:08,366 INFO L225 Difference]: With dead ends: 369 [2020-07-20 16:53:08,366 INFO L226 Difference]: Without dead ends: 218 [2020-07-20 16:53:08,369 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 213 SyntacticMatches, 11 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=187, Invalid=869, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 16:53:08,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2020-07-20 16:53:08,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 173. [2020-07-20 16:53:08,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173 states. [2020-07-20 16:53:08,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 306 transitions. [2020-07-20 16:53:08,399 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 306 transitions. Word has length 120 [2020-07-20 16:53:08,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:53:08,400 INFO L479 AbstractCegarLoop]: Abstraction has 173 states and 306 transitions. [2020-07-20 16:53:08,400 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 16:53:08,400 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 306 transitions. [2020-07-20 16:53:08,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-07-20 16:53:08,404 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:53:08,404 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] [2020-07-20 16:53:08,618 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:08,619 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:53:08,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:53:08,619 INFO L82 PathProgramCache]: Analyzing trace with hash -923530611, now seen corresponding path program 4 times [2020-07-20 16:53:08,620 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:53:08,620 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [699618603] [2020-07-20 16:53:08,621 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:08,698 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:53:08,698 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:53:08,700 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:53:08,702 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:53:08,746 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 55 proven. 14 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2020-07-20 16:53:08,747 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:53:08,981 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:08,982 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:09,025 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:09,081 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:09,140 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 55 proven. 16 refuted. 0 times theorem prover too weak. 106 trivial. 0 not checked. [2020-07-20 16:53:09,141 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [699618603] [2020-07-20 16:53:09,141 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:53:09,142 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-20 16:53:09,142 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [77582408] [2020-07-20 16:53:09,142 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 16:53:09,143 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:53:09,143 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 16:53:09,143 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-07-20 16:53:09,143 INFO L87 Difference]: Start difference. First operand 173 states and 306 transitions. Second operand 11 states. [2020-07-20 16:53:09,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:53:09,311 INFO L93 Difference]: Finished difference Result 191 states and 349 transitions. [2020-07-20 16:53:09,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:53:09,312 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 92 [2020-07-20 16:53:09,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:53:09,316 INFO L225 Difference]: With dead ends: 191 [2020-07-20 16:53:09,316 INFO L226 Difference]: Without dead ends: 187 [2020-07-20 16:53:09,318 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 [2020-07-20 16:53:09,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2020-07-20 16:53:09,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 176. [2020-07-20 16:53:09,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2020-07-20 16:53:09,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 316 transitions. [2020-07-20 16:53:09,340 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 316 transitions. Word has length 92 [2020-07-20 16:53:09,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:53:09,340 INFO L479 AbstractCegarLoop]: Abstraction has 176 states and 316 transitions. [2020-07-20 16:53:09,340 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 16:53:09,341 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 316 transitions. [2020-07-20 16:53:09,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2020-07-20 16:53:09,345 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:53:09,345 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] [2020-07-20 16:53:09,584 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:09,585 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:53:09,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:53:09,585 INFO L82 PathProgramCache]: Analyzing trace with hash -464279411, now seen corresponding path program 2 times [2020-07-20 16:53:09,586 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:53:09,586 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1084405932] [2020-07-20 16:53:09,586 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:09,666 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:53:09,667 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:53:09,668 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:53:09,671 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:53:09,829 INFO L134 CoverageAnalysis]: Checked inductivity of 332 backedges. 70 proven. 124 refuted. 0 times theorem prover too weak. 138 trivial. 0 not checked. [2020-07-20 16:53:09,829 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:53:10,417 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:10,418 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:10,483 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:10,897 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:10,898 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:10,993 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:10,994 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:11,054 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:11,055 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:11,117 INFO L134 CoverageAnalysis]: Checked inductivity of 332 backedges. 70 proven. 130 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2020-07-20 16:53:11,117 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1084405932] [2020-07-20 16:53:11,118 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:53:11,118 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 21 [2020-07-20 16:53:11,118 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [436476445] [2020-07-20 16:53:11,118 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 16:53:11,119 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:53:11,119 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 16:53:11,119 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:53:11,120 INFO L87 Difference]: Start difference. First operand 176 states and 316 transitions. Second operand 21 states. [2020-07-20 16:53:11,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:53:11,862 INFO L93 Difference]: Finished difference Result 399 states and 796 transitions. [2020-07-20 16:53:11,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-20 16:53:11,863 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 118 [2020-07-20 16:53:11,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:53:11,868 INFO L225 Difference]: With dead ends: 399 [2020-07-20 16:53:11,869 INFO L226 Difference]: Without dead ends: 226 [2020-07-20 16:53:11,871 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 206 SyntacticMatches, 15 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 159 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=219, Invalid=971, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 16:53:11,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2020-07-20 16:53:11,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 192. [2020-07-20 16:53:11,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2020-07-20 16:53:11,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 334 transitions. [2020-07-20 16:53:11,895 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 334 transitions. Word has length 118 [2020-07-20 16:53:11,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:53:11,896 INFO L479 AbstractCegarLoop]: Abstraction has 192 states and 334 transitions. [2020-07-20 16:53:11,896 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 16:53:11,896 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 334 transitions. [2020-07-20 16:53:11,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-20 16:53:11,899 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:53:11,899 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] [2020-07-20 16:53:12,112 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:12,113 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:53:12,114 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:53:12,114 INFO L82 PathProgramCache]: Analyzing trace with hash -1258440967, now seen corresponding path program 3 times [2020-07-20 16:53:12,114 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:53:12,115 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [742303111] [2020-07-20 16:53:12,115 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:12,207 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:53:12,207 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:53:12,208 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:53:12,210 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:53:12,276 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 21 proven. 117 refuted. 0 times theorem prover too weak. 191 trivial. 0 not checked. [2020-07-20 16:53:12,276 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:53:12,932 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:12,934 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:13,115 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:13,204 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:13,205 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:13,252 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:13,295 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 21 proven. 125 refuted. 0 times theorem prover too weak. 183 trivial. 0 not checked. [2020-07-20 16:53:13,296 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [742303111] [2020-07-20 16:53:13,296 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:53:13,296 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 16:53:13,296 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1691602283] [2020-07-20 16:53:13,297 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 16:53:13,297 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:53:13,297 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 16:53:13,298 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 16:53:13,298 INFO L87 Difference]: Start difference. First operand 192 states and 334 transitions. Second operand 15 states. [2020-07-20 16:53:13,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:53:13,514 INFO L93 Difference]: Finished difference Result 205 states and 355 transitions. [2020-07-20 16:53:13,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 16:53:13,515 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 117 [2020-07-20 16:53:13,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:53:13,519 INFO L225 Difference]: With dead ends: 205 [2020-07-20 16:53:13,519 INFO L226 Difference]: Without dead ends: 201 [2020-07-20 16:53:13,520 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 [2020-07-20 16:53:13,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2020-07-20 16:53:13,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 192. [2020-07-20 16:53:13,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2020-07-20 16:53:13,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 334 transitions. [2020-07-20 16:53:13,537 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 334 transitions. Word has length 117 [2020-07-20 16:53:13,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:53:13,538 INFO L479 AbstractCegarLoop]: Abstraction has 192 states and 334 transitions. [2020-07-20 16:53:13,538 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 16:53:13,539 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 334 transitions. [2020-07-20 16:53:13,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-07-20 16:53:13,542 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:53:13,542 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] [2020-07-20 16:53:13,756 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:13,757 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:53:13,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:53:13,758 INFO L82 PathProgramCache]: Analyzing trace with hash -650257977, now seen corresponding path program 5 times [2020-07-20 16:53:13,759 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:53:13,759 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1543747943] [2020-07-20 16:53:13,760 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:13,858 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:53:13,858 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:53:13,859 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:53:13,862 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:53:13,971 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 210 proven. 31 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-07-20 16:53:13,972 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:53:14,677 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:14,678 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:14,989 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:15,049 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:15,107 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 51 proven. 126 refuted. 0 times theorem prover too weak. 164 trivial. 0 not checked. [2020-07-20 16:53:15,107 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1543747943] [2020-07-20 16:53:15,107 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:53:15,107 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-20 16:53:15,108 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [339856872] [2020-07-20 16:53:15,108 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 16:53:15,109 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:53:15,109 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 16:53:15,109 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:53:15,109 INFO L87 Difference]: Start difference. First operand 192 states and 334 transitions. Second operand 17 states. [2020-07-20 16:53:15,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:53:15,526 INFO L93 Difference]: Finished difference Result 364 states and 644 transitions. [2020-07-20 16:53:15,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 16:53:15,527 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 120 [2020-07-20 16:53:15,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:53:15,530 INFO L225 Difference]: With dead ends: 364 [2020-07-20 16:53:15,531 INFO L226 Difference]: Without dead ends: 178 [2020-07-20 16:53:15,534 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 [2020-07-20 16:53:15,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2020-07-20 16:53:15,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 176. [2020-07-20 16:53:15,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2020-07-20 16:53:15,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 287 transitions. [2020-07-20 16:53:15,549 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 287 transitions. Word has length 120 [2020-07-20 16:53:15,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:53:15,550 INFO L479 AbstractCegarLoop]: Abstraction has 176 states and 287 transitions. [2020-07-20 16:53:15,550 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 16:53:15,550 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 287 transitions. [2020-07-20 16:53:15,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2020-07-20 16:53:15,554 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:53:15,555 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] [2020-07-20 16:53:15,770 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:15,771 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:53:15,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:53:15,772 INFO L82 PathProgramCache]: Analyzing trace with hash 495118725, now seen corresponding path program 6 times [2020-07-20 16:53:15,772 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:53:15,773 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1816378761] [2020-07-20 16:53:15,773 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:15,897 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:53:15,898 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:53:15,899 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 16:53:15,903 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:53:16,065 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 177 proven. 301 refuted. 0 times theorem prover too weak. 546 trivial. 0 not checked. [2020-07-20 16:53:16,065 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:53:17,014 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:17,107 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:17,165 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:17,232 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:17,660 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:17,791 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:17,866 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:17,963 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 177 proven. 311 refuted. 0 times theorem prover too weak. 536 trivial. 0 not checked. [2020-07-20 16:53:17,964 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1816378761] [2020-07-20 16:53:17,964 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:53:17,965 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 25 [2020-07-20 16:53:17,965 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [315232306] [2020-07-20 16:53:17,967 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 16:53:17,968 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:53:17,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 16:53:17,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=525, Unknown=0, NotChecked=0, Total=600 [2020-07-20 16:53:17,969 INFO L87 Difference]: Start difference. First operand 176 states and 287 transitions. Second operand 25 states. [2020-07-20 16:53:19,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:53:19,310 INFO L93 Difference]: Finished difference Result 428 states and 843 transitions. [2020-07-20 16:53:19,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-07-20 16:53:19,311 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 199 [2020-07-20 16:53:19,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:53:19,315 INFO L225 Difference]: With dead ends: 428 [2020-07-20 16:53:19,315 INFO L226 Difference]: Without dead ends: 256 [2020-07-20 16:53:19,319 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 420 GetRequests, 360 SyntacticMatches, 15 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 360 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=358, Invalid=1804, Unknown=0, NotChecked=0, Total=2162 [2020-07-20 16:53:19,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2020-07-20 16:53:19,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 219. [2020-07-20 16:53:19,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 219 states. [2020-07-20 16:53:19,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 386 transitions. [2020-07-20 16:53:19,340 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 386 transitions. Word has length 199 [2020-07-20 16:53:19,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:53:19,341 INFO L479 AbstractCegarLoop]: Abstraction has 219 states and 386 transitions. [2020-07-20 16:53:19,341 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 16:53:19,341 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 386 transitions. [2020-07-20 16:53:19,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-07-20 16:53:19,345 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:53:19,345 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] [2020-07-20 16:53:19,558 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:19,559 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:53:19,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:53:19,560 INFO L82 PathProgramCache]: Analyzing trace with hash -1245954009, now seen corresponding path program 7 times [2020-07-20 16:53:19,560 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:53:19,560 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1984510712] [2020-07-20 16:53:19,561 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:19,710 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:53:19,711 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:53:19,712 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:53:19,716 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:53:19,851 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 78 proven. 124 refuted. 0 times theorem prover too weak. 139 trivial. 0 not checked. [2020-07-20 16:53:19,852 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:53:20,467 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:20,468 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:20,536 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:20,537 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:20,993 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:20,994 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:21,100 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:21,151 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:21,152 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:21,195 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 78 proven. 130 refuted. 0 times theorem prover too weak. 133 trivial. 0 not checked. [2020-07-20 16:53:21,196 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1984510712] [2020-07-20 16:53:21,196 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:53:21,196 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 21 [2020-07-20 16:53:21,196 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2030652802] [2020-07-20 16:53:21,197 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 16:53:21,197 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:53:21,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 16:53:21,197 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=360, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:53:21,197 INFO L87 Difference]: Start difference. First operand 219 states and 386 transitions. Second operand 21 states. [2020-07-20 16:53:21,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:53:21,808 INFO L93 Difference]: Finished difference Result 423 states and 796 transitions. [2020-07-20 16:53:21,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-20 16:53:21,814 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 120 [2020-07-20 16:53:21,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:53:21,817 INFO L225 Difference]: With dead ends: 423 [2020-07-20 16:53:21,817 INFO L226 Difference]: Without dead ends: 208 [2020-07-20 16:53:21,827 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 [2020-07-20 16:53:21,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2020-07-20 16:53:21,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 174. [2020-07-20 16:53:21,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2020-07-20 16:53:21,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 278 transitions. [2020-07-20 16:53:21,855 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 278 transitions. Word has length 120 [2020-07-20 16:53:21,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:53:21,855 INFO L479 AbstractCegarLoop]: Abstraction has 174 states and 278 transitions. [2020-07-20 16:53:21,855 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 16:53:21,856 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 278 transitions. [2020-07-20 16:53:21,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-20 16:53:21,861 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:53:21,861 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] [2020-07-20 16:53:22,074 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:22,074 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:53:22,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:53:22,075 INFO L82 PathProgramCache]: Analyzing trace with hash -77183713, now seen corresponding path program 8 times [2020-07-20 16:53:22,076 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:53:22,076 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1175834576] [2020-07-20 16:53:22,077 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:22,260 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 16:53:22,261 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:53:22,262 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 16:53:22,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:53:22,420 INFO L134 CoverageAnalysis]: Checked inductivity of 346 backedges. 72 proven. 116 refuted. 0 times theorem prover too weak. 158 trivial. 0 not checked. [2020-07-20 16:53:22,420 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:53:22,978 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:22,979 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:23,067 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:23,497 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:23,498 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:23,606 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:23,608 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:23,669 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:23,718 INFO L134 CoverageAnalysis]: Checked inductivity of 346 backedges. 72 proven. 121 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2020-07-20 16:53:23,718 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1175834576] [2020-07-20 16:53:23,718 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:53:23,719 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 16] total 21 [2020-07-20 16:53:23,719 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [909663325] [2020-07-20 16:53:23,720 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 16:53:23,720 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:53:23,720 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 16:53:23,721 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=360, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:53:23,721 INFO L87 Difference]: Start difference. First operand 174 states and 278 transitions. Second operand 21 states. [2020-07-20 16:53:24,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:53:24,479 INFO L93 Difference]: Finished difference Result 377 states and 630 transitions. [2020-07-20 16:53:24,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-20 16:53:24,480 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 121 [2020-07-20 16:53:24,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:53:24,483 INFO L225 Difference]: With dead ends: 377 [2020-07-20 16:53:24,483 INFO L226 Difference]: Without dead ends: 208 [2020-07-20 16:53:24,485 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 261 GetRequests, 215 SyntacticMatches, 13 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 150 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=222, Invalid=968, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 16:53:24,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2020-07-20 16:53:24,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 183. [2020-07-20 16:53:24,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2020-07-20 16:53:24,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 294 transitions. [2020-07-20 16:53:24,502 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 294 transitions. Word has length 121 [2020-07-20 16:53:24,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:53:24,502 INFO L479 AbstractCegarLoop]: Abstraction has 183 states and 294 transitions. [2020-07-20 16:53:24,502 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 16:53:24,503 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 294 transitions. [2020-07-20 16:53:24,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-20 16:53:24,505 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:53:24,505 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] [2020-07-20 16:53:24,719 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:24,720 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:53:24,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:53:24,720 INFO L82 PathProgramCache]: Analyzing trace with hash -1540036056, now seen corresponding path program 9 times [2020-07-20 16:53:24,720 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:53:24,721 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [456173560] [2020-07-20 16:53:24,721 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:24,850 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 16:53:24,851 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:53:24,853 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 63 conjunts are in the unsatisfiable core [2020-07-20 16:53:24,856 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:53:25,253 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 172 trivial. 0 not checked. [2020-07-20 16:53:25,253 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:53:26,364 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 172 trivial. 0 not checked. [2020-07-20 16:53:26,364 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [456173560] [2020-07-20 16:53:26,364 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:53:26,365 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 28 [2020-07-20 16:53:26,365 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2107048786] [2020-07-20 16:53:26,365 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-07-20 16:53:26,365 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:53:26,366 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-07-20 16:53:26,366 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=691, Unknown=0, NotChecked=0, Total=756 [2020-07-20 16:53:26,366 INFO L87 Difference]: Start difference. First operand 183 states and 294 transitions. Second operand 28 states. [2020-07-20 16:53:26,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:53:26,756 INFO L93 Difference]: Finished difference Result 202 states and 329 transitions. [2020-07-20 16:53:26,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-20 16:53:26,757 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 109 [2020-07-20 16:53:26,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:53:26,760 INFO L225 Difference]: With dead ends: 202 [2020-07-20 16:53:26,761 INFO L226 Difference]: Without dead ends: 198 [2020-07-20 16:53:26,762 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 191 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=65, Invalid=691, Unknown=0, NotChecked=0, Total=756 [2020-07-20 16:53:26,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2020-07-20 16:53:26,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 193. [2020-07-20 16:53:26,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 193 states. [2020-07-20 16:53:26,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 316 transitions. [2020-07-20 16:53:26,779 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 316 transitions. Word has length 109 [2020-07-20 16:53:26,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:53:26,782 INFO L479 AbstractCegarLoop]: Abstraction has 193 states and 316 transitions. [2020-07-20 16:53:26,782 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-07-20 16:53:26,782 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 316 transitions. [2020-07-20 16:53:26,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-20 16:53:26,786 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:53:26,786 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:53:26,992 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:26,993 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:53:26,994 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:53:26,994 INFO L82 PathProgramCache]: Analyzing trace with hash 989968015, now seen corresponding path program 10 times [2020-07-20 16:53:26,994 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:53:26,995 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [331855912] [2020-07-20 16:53:26,995 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:27,133 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 16:53:27,134 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:53:27,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-20 16:53:27,138 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:53:27,278 INFO L134 CoverageAnalysis]: Checked inductivity of 334 backedges. 82 proven. 124 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2020-07-20 16:53:27,278 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:53:28,009 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:28,010 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:28,097 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:28,587 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:28,703 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:28,704 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:28,760 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:28,811 INFO L134 CoverageAnalysis]: Checked inductivity of 334 backedges. 81 proven. 131 refuted. 0 times theorem prover too weak. 122 trivial. 0 not checked. [2020-07-20 16:53:28,811 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [331855912] [2020-07-20 16:53:28,812 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:53:28,812 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 18] total 23 [2020-07-20 16:53:28,812 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1395986458] [2020-07-20 16:53:28,812 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 16:53:28,813 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:53:28,813 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 16:53:28,813 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=436, Unknown=0, NotChecked=0, Total=506 [2020-07-20 16:53:28,813 INFO L87 Difference]: Start difference. First operand 193 states and 316 transitions. Second operand 23 states. [2020-07-20 16:53:29,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:53:29,776 INFO L93 Difference]: Finished difference Result 379 states and 649 transitions. [2020-07-20 16:53:29,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-07-20 16:53:29,780 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 121 [2020-07-20 16:53:29,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:53:29,783 INFO L225 Difference]: With dead ends: 379 [2020-07-20 16:53:29,783 INFO L226 Difference]: Without dead ends: 191 [2020-07-20 16:53:29,793 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 262 GetRequests, 209 SyntacticMatches, 15 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 232 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=291, Invalid=1269, Unknown=0, NotChecked=0, Total=1560 [2020-07-20 16:53:29,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2020-07-20 16:53:29,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 187. [2020-07-20 16:53:29,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2020-07-20 16:53:29,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 293 transitions. [2020-07-20 16:53:29,810 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 293 transitions. Word has length 121 [2020-07-20 16:53:29,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:53:29,810 INFO L479 AbstractCegarLoop]: Abstraction has 187 states and 293 transitions. [2020-07-20 16:53:29,810 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 16:53:29,811 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 293 transitions. [2020-07-20 16:53:29,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2020-07-20 16:53:29,814 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:53:29,814 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 13, 13, 10, 8, 8, 8, 8, 8, 8, 8, 8, 8, 6, 6, 6, 6, 6, 6, 6, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:53:30,028 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:30,029 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:53:30,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:53:30,029 INFO L82 PathProgramCache]: Analyzing trace with hash 399086737, now seen corresponding path program 11 times [2020-07-20 16:53:30,030 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:53:30,030 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1973459678] [2020-07-20 16:53:30,030 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:30,171 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 16:53:30,171 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:53:30,173 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:53:30,177 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:53:30,309 INFO L134 CoverageAnalysis]: Checked inductivity of 1037 backedges. 505 proven. 32 refuted. 0 times theorem prover too weak. 500 trivial. 0 not checked. [2020-07-20 16:53:30,309 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:53:31,540 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:31,821 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:31,877 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:31,942 INFO L134 CoverageAnalysis]: Checked inductivity of 1037 backedges. 100 proven. 290 refuted. 0 times theorem prover too weak. 647 trivial. 0 not checked. [2020-07-20 16:53:31,943 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1973459678] [2020-07-20 16:53:31,943 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:53:31,943 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-20 16:53:31,943 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1376123077] [2020-07-20 16:53:31,944 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 16:53:31,944 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:53:31,944 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 16:53:31,945 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=229, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:53:31,945 INFO L87 Difference]: Start difference. First operand 187 states and 293 transitions. Second operand 17 states. [2020-07-20 16:53:32,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:53:32,501 INFO L93 Difference]: Finished difference Result 382 states and 620 transitions. [2020-07-20 16:53:32,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 16:53:32,508 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 199 [2020-07-20 16:53:32,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:53:32,511 INFO L225 Difference]: With dead ends: 382 [2020-07-20 16:53:32,511 INFO L226 Difference]: Without dead ends: 200 [2020-07-20 16:53:32,513 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 407 GetRequests, 371 SyntacticMatches, 11 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=137, Invalid=565, Unknown=0, NotChecked=0, Total=702 [2020-07-20 16:53:32,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2020-07-20 16:53:32,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 179. [2020-07-20 16:53:32,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 179 states. [2020-07-20 16:53:32,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 276 transitions. [2020-07-20 16:53:32,528 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 276 transitions. Word has length 199 [2020-07-20 16:53:32,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:53:32,528 INFO L479 AbstractCegarLoop]: Abstraction has 179 states and 276 transitions. [2020-07-20 16:53:32,528 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 16:53:32,529 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 276 transitions. [2020-07-20 16:53:32,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-20 16:53:32,531 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:53:32,531 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] [2020-07-20 16:53:32,745 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:32,746 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:53:32,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:53:32,747 INFO L82 PathProgramCache]: Analyzing trace with hash -1905629551, now seen corresponding path program 12 times [2020-07-20 16:53:32,747 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:53:32,748 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1361014405] [2020-07-20 16:53:32,748 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:53:32,947 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:53:32,947 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:53:32,949 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-20 16:53:32,952 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:53:33,052 INFO L134 CoverageAnalysis]: Checked inductivity of 346 backedges. 211 proven. 11 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2020-07-20 16:53:33,052 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:53:33,770 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:33,771 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:33,866 INFO L134 CoverageAnalysis]: Checked inductivity of 346 backedges. 60 proven. 94 refuted. 0 times theorem prover too weak. 192 trivial. 0 not checked. [2020-07-20 16:53:33,866 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1361014405] [2020-07-20 16:53:33,867 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:53:33,867 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 14 [2020-07-20 16:53:33,867 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1834467254] [2020-07-20 16:53:33,868 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 16:53:33,868 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:53:33,868 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 16:53:33,868 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-07-20 16:53:33,869 INFO L87 Difference]: Start difference. First operand 179 states and 276 transitions. Second operand 14 states. [2020-07-20 16:53:34,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:53:34,121 INFO L93 Difference]: Finished difference Result 352 states and 565 transitions. [2020-07-20 16:53:34,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:53:34,122 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 121 [2020-07-20 16:53:34,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:53:34,125 INFO L225 Difference]: With dead ends: 352 [2020-07-20 16:53:34,125 INFO L226 Difference]: Without dead ends: 179 [2020-07-20 16:53:34,127 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 222 SyntacticMatches, 7 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=74, Invalid=268, Unknown=0, NotChecked=0, Total=342 [2020-07-20 16:53:34,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2020-07-20 16:53:34,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 179. [2020-07-20 16:53:34,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 179 states. [2020-07-20 16:53:34,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 275 transitions. [2020-07-20 16:53:34,143 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 275 transitions. Word has length 121 [2020-07-20 16:53:34,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:53:34,143 INFO L479 AbstractCegarLoop]: Abstraction has 179 states and 275 transitions. [2020-07-20 16:53:34,144 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 16:53:34,144 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 275 transitions. [2020-07-20 16:53:34,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 282 [2020-07-20 16:53:34,147 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:53:34,147 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 20, 20, 14, 14, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 7, 6, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:53:34,362 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:34,363 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:53:34,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:53:34,364 INFO L82 PathProgramCache]: Analyzing trace with hash 804744555, now seen corresponding path program 13 times [2020-07-20 16:53:34,364 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:53:34,364 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1082401479] [2020-07-20 16:53:34,365 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:34,604 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:53:34,605 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:53:34,608 INFO L263 TraceCheckSpWp]: Trace formula consists of 424 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 16:53:34,615 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:53:34,859 INFO L134 CoverageAnalysis]: Checked inductivity of 2142 backedges. 355 proven. 609 refuted. 0 times theorem prover too weak. 1178 trivial. 0 not checked. [2020-07-20 16:53:34,860 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:53:36,860 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:37,274 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:37,515 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:37,639 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:37,716 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:38,647 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:38,649 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:38,852 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:38,853 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:38,970 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:38,971 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:39,040 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:39,041 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:39,133 INFO L134 CoverageAnalysis]: Checked inductivity of 2142 backedges. 355 proven. 635 refuted. 0 times theorem prover too weak. 1152 trivial. 0 not checked. [2020-07-20 16:53:39,133 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1082401479] [2020-07-20 16:53:39,133 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:53:39,133 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 25] total 31 [2020-07-20 16:53:39,134 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [283299865] [2020-07-20 16:53:39,134 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-20 16:53:39,134 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:53:39,135 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-20 16:53:39,135 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=824, Unknown=0, NotChecked=0, Total=930 [2020-07-20 16:53:39,135 INFO L87 Difference]: Start difference. First operand 179 states and 275 transitions. Second operand 31 states. [2020-07-20 16:53:41,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:53:41,441 INFO L93 Difference]: Finished difference Result 447 states and 808 transitions. [2020-07-20 16:53:41,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-07-20 16:53:41,442 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 281 [2020-07-20 16:53:41,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:53:41,448 INFO L225 Difference]: With dead ends: 447 [2020-07-20 16:53:41,448 INFO L226 Difference]: Without dead ends: 274 [2020-07-20 16:53:41,451 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 587 GetRequests, 511 SyntacticMatches, 21 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 641 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=496, Invalid=2696, Unknown=0, NotChecked=0, Total=3192 [2020-07-20 16:53:41,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2020-07-20 16:53:41,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 245. [2020-07-20 16:53:41,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 245 states. [2020-07-20 16:53:41,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 245 states to 245 states and 414 transitions. [2020-07-20 16:53:41,473 INFO L78 Accepts]: Start accepts. Automaton has 245 states and 414 transitions. Word has length 281 [2020-07-20 16:53:41,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:53:41,473 INFO L479 AbstractCegarLoop]: Abstraction has 245 states and 414 transitions. [2020-07-20 16:53:41,473 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-20 16:53:41,473 INFO L276 IsEmpty]: Start isEmpty. Operand 245 states and 414 transitions. [2020-07-20 16:53:41,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2020-07-20 16:53:41,478 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:53:41,478 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:53:41,691 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:41,692 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:53:41,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:53:41,692 INFO L82 PathProgramCache]: Analyzing trace with hash -71686390, now seen corresponding path program 14 times [2020-07-20 16:53:41,692 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:53:41,693 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1807320417] [2020-07-20 16:53:41,693 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:41,876 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:53:41,876 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:53:41,878 INFO L263 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 16:53:41,880 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:53:42,051 INFO L134 CoverageAnalysis]: Checked inductivity of 418 backedges. 256 proven. 51 refuted. 0 times theorem prover too weak. 111 trivial. 0 not checked. [2020-07-20 16:53:42,051 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:53:42,862 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:43,320 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:43,416 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:43,417 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:43,520 INFO L134 CoverageAnalysis]: Checked inductivity of 418 backedges. 90 proven. 126 refuted. 0 times theorem prover too weak. 202 trivial. 0 not checked. [2020-07-20 16:53:43,520 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1807320417] [2020-07-20 16:53:43,520 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:53:43,521 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 19 [2020-07-20 16:53:43,521 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1021242423] [2020-07-20 16:53:43,522 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 16:53:43,522 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:53:43,522 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 16:53:43,522 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=287, Unknown=0, NotChecked=0, Total=342 [2020-07-20 16:53:43,523 INFO L87 Difference]: Start difference. First operand 245 states and 414 transitions. Second operand 19 states. [2020-07-20 16:53:44,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:53:44,161 INFO L93 Difference]: Finished difference Result 492 states and 851 transitions. [2020-07-20 16:53:44,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 16:53:44,162 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 133 [2020-07-20 16:53:44,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:53:44,166 INFO L225 Difference]: With dead ends: 492 [2020-07-20 16:53:44,166 INFO L226 Difference]: Without dead ends: 253 [2020-07-20 16:53:44,168 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 237 SyntacticMatches, 11 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=168, Invalid=702, Unknown=0, NotChecked=0, Total=870 [2020-07-20 16:53:44,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 253 states. [2020-07-20 16:53:44,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 253 to 251. [2020-07-20 16:53:44,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 251 states. [2020-07-20 16:53:44,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 251 states to 251 states and 414 transitions. [2020-07-20 16:53:44,189 INFO L78 Accepts]: Start accepts. Automaton has 251 states and 414 transitions. Word has length 133 [2020-07-20 16:53:44,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:53:44,190 INFO L479 AbstractCegarLoop]: Abstraction has 251 states and 414 transitions. [2020-07-20 16:53:44,190 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 16:53:44,190 INFO L276 IsEmpty]: Start isEmpty. Operand 251 states and 414 transitions. [2020-07-20 16:53:44,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2020-07-20 16:53:44,194 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:53:44,194 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:53:44,407 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:44,408 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:53:44,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:53:44,408 INFO L82 PathProgramCache]: Analyzing trace with hash 247206723, now seen corresponding path program 15 times [2020-07-20 16:53:44,408 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:53:44,408 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [224932765] [2020-07-20 16:53:44,409 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:44,623 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:53:44,624 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:53:44,626 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-20 16:53:44,629 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:53:44,790 INFO L134 CoverageAnalysis]: Checked inductivity of 510 backedges. 137 proven. 143 refuted. 0 times theorem prover too weak. 230 trivial. 0 not checked. [2020-07-20 16:53:44,790 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:53:45,468 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:45,469 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:45,532 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:45,533 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:46,100 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:46,101 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:46,253 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:46,254 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:46,343 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:46,344 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:46,444 INFO L134 CoverageAnalysis]: Checked inductivity of 510 backedges. 136 proven. 150 refuted. 0 times theorem prover too weak. 224 trivial. 0 not checked. [2020-07-20 16:53:46,444 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [224932765] [2020-07-20 16:53:46,444 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:53:46,444 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 18] total 23 [2020-07-20 16:53:46,445 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1924733462] [2020-07-20 16:53:46,445 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 16:53:46,446 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:53:46,446 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 16:53:46,446 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=435, Unknown=0, NotChecked=0, Total=506 [2020-07-20 16:53:46,446 INFO L87 Difference]: Start difference. First operand 251 states and 414 transitions. Second operand 23 states. [2020-07-20 16:53:47,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:53:47,486 INFO L93 Difference]: Finished difference Result 504 states and 872 transitions. [2020-07-20 16:53:47,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-20 16:53:47,488 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 145 [2020-07-20 16:53:47,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:53:47,492 INFO L225 Difference]: With dead ends: 504 [2020-07-20 16:53:47,493 INFO L226 Difference]: Without dead ends: 258 [2020-07-20 16:53:47,498 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 254 SyntacticMatches, 15 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 207 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=233, Invalid=1099, Unknown=0, NotChecked=0, Total=1332 [2020-07-20 16:53:47,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258 states. [2020-07-20 16:53:47,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258 to 245. [2020-07-20 16:53:47,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 245 states. [2020-07-20 16:53:47,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 245 states to 245 states and 389 transitions. [2020-07-20 16:53:47,524 INFO L78 Accepts]: Start accepts. Automaton has 245 states and 389 transitions. Word has length 145 [2020-07-20 16:53:47,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:53:47,525 INFO L479 AbstractCegarLoop]: Abstraction has 245 states and 389 transitions. [2020-07-20 16:53:47,525 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 16:53:47,525 INFO L276 IsEmpty]: Start isEmpty. Operand 245 states and 389 transitions. [2020-07-20 16:53:47,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 253 [2020-07-20 16:53:47,530 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:53:47,531 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 18, 18, 12, 11, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 7, 7, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:53:47,746 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:47,747 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:53:47,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:53:47,747 INFO L82 PathProgramCache]: Analyzing trace with hash -1757832939, now seen corresponding path program 16 times [2020-07-20 16:53:47,748 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:53:47,748 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1902761956] [2020-07-20 16:53:47,748 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:47,965 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:53:47,965 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:53:47,967 INFO L263 TraceCheckSpWp]: Trace formula consists of 374 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:53:47,970 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:53:48,102 INFO L134 CoverageAnalysis]: Checked inductivity of 1705 backedges. 916 proven. 129 refuted. 0 times theorem prover too weak. 660 trivial. 0 not checked. [2020-07-20 16:53:48,102 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:53:49,204 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:49,205 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:49,284 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:49,286 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:49,368 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:49,699 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:49,700 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:49,759 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:49,831 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:49,954 INFO L134 CoverageAnalysis]: Checked inductivity of 1705 backedges. 285 proven. 283 refuted. 0 times theorem prover too weak. 1137 trivial. 0 not checked. [2020-07-20 16:53:49,954 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1902761956] [2020-07-20 16:53:49,955 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:53:49,955 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 19 [2020-07-20 16:53:49,955 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1007795402] [2020-07-20 16:53:49,955 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 16:53:49,956 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:53:49,956 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 16:53:49,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-07-20 16:53:49,956 INFO L87 Difference]: Start difference. First operand 245 states and 389 transitions. Second operand 19 states. [2020-07-20 16:53:50,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:53:50,647 INFO L93 Difference]: Finished difference Result 606 states and 1056 transitions. [2020-07-20 16:53:50,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-20 16:53:50,648 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 252 [2020-07-20 16:53:50,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:53:50,654 INFO L225 Difference]: With dead ends: 606 [2020-07-20 16:53:50,654 INFO L226 Difference]: Without dead ends: 312 [2020-07-20 16:53:50,658 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 516 GetRequests, 473 SyntacticMatches, 13 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 115 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=194, Invalid=798, Unknown=0, NotChecked=0, Total=992 [2020-07-20 16:53:50,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 312 states. [2020-07-20 16:53:50,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 312 to 268. [2020-07-20 16:53:50,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 268 states. [2020-07-20 16:53:50,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 268 states to 268 states and 442 transitions. [2020-07-20 16:53:50,683 INFO L78 Accepts]: Start accepts. Automaton has 268 states and 442 transitions. Word has length 252 [2020-07-20 16:53:50,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:53:50,684 INFO L479 AbstractCegarLoop]: Abstraction has 268 states and 442 transitions. [2020-07-20 16:53:50,684 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 16:53:50,684 INFO L276 IsEmpty]: Start isEmpty. Operand 268 states and 442 transitions. [2020-07-20 16:53:50,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 238 [2020-07-20 16:53:50,688 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:53:50,688 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 10, 10, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:53:50,904 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:50,904 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:53:50,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:53:50,904 INFO L82 PathProgramCache]: Analyzing trace with hash 120952594, now seen corresponding path program 17 times [2020-07-20 16:53:50,905 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:53:50,905 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2065898658] [2020-07-20 16:53:50,905 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:51,138 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:53:51,139 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:53:51,141 INFO L263 TraceCheckSpWp]: Trace formula consists of 461 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:53:51,144 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:53:51,230 INFO L134 CoverageAnalysis]: Checked inductivity of 1502 backedges. 313 proven. 64 refuted. 0 times theorem prover too weak. 1125 trivial. 0 not checked. [2020-07-20 16:53:51,230 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:53:51,852 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:51,852 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:52,008 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:52,009 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:52,132 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:52,133 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:52,180 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:52,181 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:52,298 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:52,579 INFO L134 CoverageAnalysis]: Checked inductivity of 1502 backedges. 313 proven. 74 refuted. 0 times theorem prover too weak. 1115 trivial. 0 not checked. [2020-07-20 16:53:52,580 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2065898658] [2020-07-20 16:53:52,580 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:53:52,580 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 16:53:52,580 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [774094454] [2020-07-20 16:53:52,581 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 16:53:52,581 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:53:52,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 16:53:52,582 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 16:53:52,582 INFO L87 Difference]: Start difference. First operand 268 states and 442 transitions. Second operand 15 states. [2020-07-20 16:53:52,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:53:52,863 INFO L93 Difference]: Finished difference Result 275 states and 453 transitions. [2020-07-20 16:53:52,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 16:53:52,864 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 237 [2020-07-20 16:53:52,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:53:52,867 INFO L225 Difference]: With dead ends: 275 [2020-07-20 16:53:52,867 INFO L226 Difference]: Without dead ends: 271 [2020-07-20 16:53:52,868 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 479 GetRequests, 450 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-20 16:53:52,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 271 states. [2020-07-20 16:53:52,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 271 to 268. [2020-07-20 16:53:52,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 268 states. [2020-07-20 16:53:52,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 268 states to 268 states and 442 transitions. [2020-07-20 16:53:52,885 INFO L78 Accepts]: Start accepts. Automaton has 268 states and 442 transitions. Word has length 237 [2020-07-20 16:53:52,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:53:52,886 INFO L479 AbstractCegarLoop]: Abstraction has 268 states and 442 transitions. [2020-07-20 16:53:52,886 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 16:53:52,886 INFO L276 IsEmpty]: Start isEmpty. Operand 268 states and 442 transitions. [2020-07-20 16:53:52,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 235 [2020-07-20 16:53:52,889 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:53:52,890 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 10, 9, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:53:53,103 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:53,104 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:53:53,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:53:53,104 INFO L82 PathProgramCache]: Analyzing trace with hash -1025098094, now seen corresponding path program 4 times [2020-07-20 16:53:53,105 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:53:53,105 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [402235198] [2020-07-20 16:53:53,105 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:53,345 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:53:53,345 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:53:53,347 INFO L263 TraceCheckSpWp]: Trace formula consists of 454 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:53:53,350 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:53:53,453 INFO L134 CoverageAnalysis]: Checked inductivity of 1476 backedges. 121 proven. 339 refuted. 0 times theorem prover too weak. 1016 trivial. 0 not checked. [2020-07-20 16:53:53,453 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:53:54,701 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:54,702 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:55,099 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:55,372 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:55,496 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:55,561 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:55,633 INFO L134 CoverageAnalysis]: Checked inductivity of 1476 backedges. 121 proven. 353 refuted. 0 times theorem prover too weak. 1002 trivial. 0 not checked. [2020-07-20 16:53:55,633 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [402235198] [2020-07-20 16:53:55,634 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:53:55,634 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 16:53:55,634 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1190322794] [2020-07-20 16:53:55,635 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 16:53:55,635 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:53:55,635 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 16:53:55,636 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:53:55,636 INFO L87 Difference]: Start difference. First operand 268 states and 442 transitions. Second operand 17 states. [2020-07-20 16:53:55,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:53:55,997 INFO L93 Difference]: Finished difference Result 283 states and 471 transitions. [2020-07-20 16:53:55,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 16:53:55,998 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 234 [2020-07-20 16:53:55,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:53:55,999 INFO L225 Difference]: With dead ends: 283 [2020-07-20 16:53:55,999 INFO L226 Difference]: Without dead ends: 92 [2020-07-20 16:53:56,001 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 474 GetRequests, 440 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 16:53:56,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-07-20 16:53:56,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 82. [2020-07-20 16:53:56,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-07-20 16:53:56,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 93 transitions. [2020-07-20 16:53:56,008 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 93 transitions. Word has length 234 [2020-07-20 16:53:56,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:53:56,009 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 93 transitions. [2020-07-20 16:53:56,009 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 16:53:56,009 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 93 transitions. [2020-07-20 16:53:56,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2020-07-20 16:53:56,011 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:53:56,011 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:53:56,226 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:56,227 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:53:56,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:53:56,228 INFO L82 PathProgramCache]: Analyzing trace with hash -754125023, now seen corresponding path program 5 times [2020-07-20 16:53:56,228 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:53:56,229 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1074889095] [2020-07-20 16:53:56,229 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:56,466 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:53:56,467 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:53:56,468 INFO L263 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 16:53:56,470 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:53:56,583 INFO L134 CoverageAnalysis]: Checked inductivity of 726 backedges. 71 proven. 188 refuted. 0 times theorem prover too weak. 467 trivial. 0 not checked. [2020-07-20 16:53:56,583 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:53:57,616 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:57,900 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:58,070 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:58,170 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:58,266 INFO L134 CoverageAnalysis]: Checked inductivity of 726 backedges. 69 proven. 198 refuted. 0 times theorem prover too weak. 459 trivial. 0 not checked. [2020-07-20 16:53:58,266 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1074889095] [2020-07-20 16:53:58,266 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:53:58,267 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14] total 17 [2020-07-20 16:53:58,267 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [423842958] [2020-07-20 16:53:58,267 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 16:53:58,267 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:53:58,267 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 16:53:58,268 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:53:58,268 INFO L87 Difference]: Start difference. First operand 82 states and 93 transitions. Second operand 17 states. [2020-07-20 16:53:58,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:53:58,541 INFO L93 Difference]: Finished difference Result 82 states and 93 transitions. [2020-07-20 16:53:58,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 16:53:58,542 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 169 [2020-07-20 16:53:58,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:53:58,543 INFO L225 Difference]: With dead ends: 82 [2020-07-20 16:53:58,543 INFO L226 Difference]: Without dead ends: 0 [2020-07-20 16:53:58,545 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 342 GetRequests, 311 SyntacticMatches, 11 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=105, Invalid=357, Unknown=0, NotChecked=0, Total=462 [2020-07-20 16:53:58,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-20 16:53:58,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-20 16:53:58,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-20 16:53:58,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-20 16:53:58,546 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 169 [2020-07-20 16:53:58,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:53:58,546 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-20 16:53:58,546 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 16:53:58,547 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-20 16:53:58,547 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-20 16:53:58,753 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:58,758 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-20 16:54:01,123 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 131 DAG size of output: 65 [2020-07-20 16:54:02,444 WARN L193 SmtUtils]: Spent 404.00 ms on a formula simplification. DAG size of input: 116 DAG size of output: 9 [2020-07-20 16:54:02,749 WARN L193 SmtUtils]: Spent 295.00 ms on a formula simplification. DAG size of input: 89 DAG size of output: 1 [2020-07-20 16:54:03,018 WARN L193 SmtUtils]: Spent 262.00 ms on a formula simplification. DAG size of input: 98 DAG size of output: 1 [2020-07-20 16:54:03,812 WARN L193 SmtUtils]: Spent 784.00 ms on a formula simplification. DAG size of input: 130 DAG size of output: 21 [2020-07-20 16:54:04,114 WARN L193 SmtUtils]: Spent 295.00 ms on a formula simplification. DAG size of input: 101 DAG size of output: 8 [2020-07-20 16:54:04,815 WARN L193 SmtUtils]: Spent 690.00 ms on a formula simplification. DAG size of input: 175 DAG size of output: 19 [2020-07-20 16:54:04,820 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-20 16:54:04,821 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-20 16:54:04,821 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-20 16:54:04,821 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-20 16:54:04,821 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-20 16:54:04,821 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-20 16:54:04,821 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 39) no Hoare annotation was computed. [2020-07-20 16:54:04,822 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 35 42) the Hoare annotation is: true [2020-07-20 16:54:04,822 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 35 42) no Hoare annotation was computed. [2020-07-20 16:54:04,822 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 35 42) no Hoare annotation was computed. [2020-07-20 16:54:04,822 INFO L268 CegarLoopResult]: For program point L39(line 39) no Hoare annotation was computed. [2020-07-20 16:54:04,822 INFO L268 CegarLoopResult]: For program point L38(lines 38 40) no Hoare annotation was computed. [2020-07-20 16:54:04,822 INFO L264 CegarLoopResult]: At program point L37(line 37) the Hoare annotation is: (and (<= main_~x~0 5) (<= 5 main_~x~0)) [2020-07-20 16:54:04,823 INFO L268 CegarLoopResult]: For program point L37-1(line 37) no Hoare annotation was computed. [2020-07-20 16:54:04,823 INFO L268 CegarLoopResult]: For program point L38-2(lines 38 40) no Hoare annotation was computed. [2020-07-20 16:54:04,823 INFO L271 CegarLoopResult]: At program point fibo2ENTRY(lines 17 25) the Hoare annotation is: true [2020-07-20 16:54:04,823 INFO L264 CegarLoopResult]: At program point L23(line 23) the Hoare annotation is: (and (<= fibo2_~n |fibo2_#in~n|) (<= |fibo2_#in~n| fibo2_~n) (not (<= |fibo2_#in~n| 2))) [2020-07-20 16:54:04,823 INFO L268 CegarLoopResult]: For program point L23-1(line 23) no Hoare annotation was computed. [2020-07-20 16:54:04,823 INFO L264 CegarLoopResult]: At program point L23-2(line 23) the Hoare annotation is: (and (<= fibo2_~n |fibo2_#in~n|) (<= |fibo2_#in~n| fibo2_~n) (or (not (<= |fibo2_#in~n| 4)) (and (= 1 |fibo2_#t~ret2|) (<= fibo2_~n 3)) (and (= 2 |fibo2_#t~ret2|) (<= 4 fibo2_~n))) (<= 3 fibo2_~n)) [2020-07-20 16:54:04,823 INFO L268 CegarLoopResult]: For program point L20(lines 20 24) no Hoare annotation was computed. [2020-07-20 16:54:04,824 INFO L268 CegarLoopResult]: For program point L23-3(line 23) no Hoare annotation was computed. [2020-07-20 16:54:04,824 INFO L268 CegarLoopResult]: For program point L18(lines 18 24) no Hoare annotation was computed. [2020-07-20 16:54:04,824 INFO L268 CegarLoopResult]: For program point fibo2FINAL(lines 17 25) no Hoare annotation was computed. [2020-07-20 16:54:04,824 INFO L268 CegarLoopResult]: For program point fibo2EXIT(lines 17 25) no Hoare annotation was computed. [2020-07-20 16:54:04,824 INFO L271 CegarLoopResult]: At program point fibo1ENTRY(lines 7 15) the Hoare annotation is: true [2020-07-20 16:54:04,824 INFO L264 CegarLoopResult]: At program point L13(line 13) the Hoare annotation is: (and (<= fibo1_~n |fibo1_#in~n|) (not (<= |fibo1_#in~n| 2)) (<= |fibo1_#in~n| fibo1_~n)) [2020-07-20 16:54:04,824 INFO L268 CegarLoopResult]: For program point L13-1(line 13) no Hoare annotation was computed. [2020-07-20 16:54:04,824 INFO L264 CegarLoopResult]: At program point L13-2(line 13) the Hoare annotation is: (let ((.cse1 (<= fibo1_~n |fibo1_#in~n|)) (.cse0 (<= |fibo1_#in~n| fibo1_~n))) (or (and (<= fibo1_~n 4) .cse0 (<= 4 |fibo1_#in~n|)) (and .cse1 (<= 6 fibo1_~n) .cse0) (and .cse1 (<= 5 fibo1_~n) (= 3 |fibo1_#t~ret0|) .cse0))) [2020-07-20 16:54:04,824 INFO L268 CegarLoopResult]: For program point fibo1FINAL(lines 7 15) no Hoare annotation was computed. [2020-07-20 16:54:04,824 INFO L268 CegarLoopResult]: For program point L10(lines 10 14) no Hoare annotation was computed. [2020-07-20 16:54:04,825 INFO L268 CegarLoopResult]: For program point L13-3(line 13) no Hoare annotation was computed. [2020-07-20 16:54:04,825 INFO L268 CegarLoopResult]: For program point L8(lines 8 14) no Hoare annotation was computed. [2020-07-20 16:54:04,825 INFO L268 CegarLoopResult]: For program point fibo1EXIT(lines 7 15) no Hoare annotation was computed. [2020-07-20 16:54:04,832 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 04:54:04 BoogieIcfgContainer [2020-07-20 16:54:04,833 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 16:54:04,835 INFO L168 Benchmark]: Toolchain (without parser) took 76149.60 ms. Allocated memory was 144.7 MB in the beginning and 639.1 MB in the end (delta: 494.4 MB). Free memory was 102.6 MB in the beginning and 448.0 MB in the end (delta: -345.4 MB). Peak memory consumption was 517.8 MB. Max. memory is 7.1 GB. [2020-07-20 16:54:04,836 INFO L168 Benchmark]: CDTParser took 0.99 ms. Allocated memory is still 144.7 MB. Free memory was 120.9 MB in the beginning and 120.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-20 16:54:04,836 INFO L168 Benchmark]: CACSL2BoogieTranslator took 290.51 ms. Allocated memory is still 144.7 MB. Free memory was 102.2 MB in the beginning and 92.7 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. [2020-07-20 16:54:04,837 INFO L168 Benchmark]: Boogie Preprocessor took 39.56 ms. Allocated memory is still 144.7 MB. Free memory was 92.7 MB in the beginning and 91.3 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-07-20 16:54:04,837 INFO L168 Benchmark]: RCFGBuilder took 451.64 ms. Allocated memory was 144.7 MB in the beginning and 201.9 MB in the end (delta: 57.1 MB). Free memory was 91.3 MB in the beginning and 168.0 MB in the end (delta: -76.7 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. [2020-07-20 16:54:04,837 INFO L168 Benchmark]: TraceAbstraction took 75359.32 ms. Allocated memory was 201.9 MB in the beginning and 639.1 MB in the end (delta: 437.3 MB). Free memory was 167.3 MB in the beginning and 448.0 MB in the end (delta: -280.7 MB). Peak memory consumption was 525.4 MB. Max. memory is 7.1 GB. [2020-07-20 16:54:04,840 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.99 ms. Allocated memory is still 144.7 MB. Free memory was 120.9 MB in the beginning and 120.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 290.51 ms. Allocated memory is still 144.7 MB. Free memory was 102.2 MB in the beginning and 92.7 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 39.56 ms. Allocated memory is still 144.7 MB. Free memory was 92.7 MB in the beginning and 91.3 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 451.64 ms. Allocated memory was 144.7 MB in the beginning and 201.9 MB in the end (delta: 57.1 MB). Free memory was 91.3 MB in the beginning and 168.0 MB in the end (delta: -76.7 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 75359.32 ms. Allocated memory was 201.9 MB in the beginning and 639.1 MB in the end (delta: 437.3 MB). Free memory was 167.3 MB in the beginning and 448.0 MB in the end (delta: -280.7 MB). Peak memory consumption was 525.4 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 39]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 69.2s, OverallIterations: 34, TraceHistogramMax: 21, AutomataDifference: 17.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 6.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 1051 SDtfs, 2036 SDslu, 8123 SDs, 0 SdLazy, 9558 SolverSat, 2197 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 8.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 7884 GetRequests, 6799 SyntacticMatches, 319 SemanticMatches, 766 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3328 ImplicationChecksByTransitivity, 13.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=268occurred in iteration=31, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.7s AutomataMinimizationTime, 34 MinimizatonAttempts, 443 StatesRemovedByMinimization, 31 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 11 LocationsWithAnnotation, 1811 PreInvPairs, 2832 NumberOfFragments, 98 HoareAnnotationTreeSize, 1811 FomulaSimplifications, 213041 FormulaSimplificationTreeSizeReduction, 3.2s HoareSimplificationTime, 11 FomulaSimplificationsInter, 171765 FormulaSimplificationTreeSizeReductionInter, 2.7s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.2s SsaConstructionTime, 1.0s SatisfiabilityAnalysisTime, 39.6s InterpolantComputationTime, 3798 NumberOfCodeBlocks, 2480 NumberOfCodeBlocksAsserted, 91 NumberOfCheckSat, 7503 ConstructedInterpolants, 0 QuantifiedInterpolants, 2030409 SizeOfPredicates, 205 NumberOfNonLiveVariables, 6603 ConjunctsInSsa, 443 ConjunctsInUnsatCore, 66 InterpolantComputations, 2 PerfectInterpolantSequences, 22401/29230 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...