/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-invgen/MADWiFi-encode_ie_ok.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 22:27:44,624 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 22:27:44,626 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 22:27:44,638 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 22:27:44,639 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 22:27:44,640 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 22:27:44,641 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 22:27:44,643 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 22:27:44,645 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 22:27:44,646 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 22:27:44,647 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 22:27:44,648 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 22:27:44,648 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 22:27:44,649 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 22:27:44,650 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 22:27:44,651 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 22:27:44,652 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 22:27:44,653 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 22:27:44,654 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 22:27:44,656 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 22:27:44,658 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 22:27:44,659 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 22:27:44,660 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 22:27:44,661 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 22:27:44,663 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 22:27:44,673 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 22:27:44,689 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 22:27:44,689 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 22:27:44,693 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 22:27:44,694 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 22:27:44,694 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 22:27:44,694 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 22:27:44,694 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 22:27:44,694 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 22:27:44,695 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 22:27:44,695 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 22:27:44,695 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 22:27:44,695 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 22:27:44,695 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 22:27:44,696 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 22:27:44,696 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 22:27:44,696 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 22:27:44,696 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 22:27:44,696 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 22:27:44,697 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 22:27:44,697 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 22:27:44,697 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 22:27:44,697 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 22:27:44,697 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 22:27:44,698 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 22:27:44,698 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 22:27:44,698 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 22:27:44,698 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:27:44,698 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 22:27:44,699 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 22:27:44,699 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> DAGSIZE Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 22:27:45,012 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 22:27:45,025 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 22:27:45,029 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 22:27:45,031 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 22:27:45,031 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 22:27:45,032 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/MADWiFi-encode_ie_ok.i [2020-07-20 22:27:45,109 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b60092ca7/c2c15261e20c4cf1835a2aafb6c7b379/FLAGb0f0f2699 [2020-07-20 22:27:45,607 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 22:27:45,607 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/MADWiFi-encode_ie_ok.i [2020-07-20 22:27:45,614 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b60092ca7/c2c15261e20c4cf1835a2aafb6c7b379/FLAGb0f0f2699 [2020-07-20 22:27:45,966 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b60092ca7/c2c15261e20c4cf1835a2aafb6c7b379 [2020-07-20 22:27:45,975 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 22:27:45,978 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 22:27:45,979 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 22:27:45,980 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 22:27:45,983 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 22:27:45,984 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 10:27:45" (1/1) ... [2020-07-20 22:27:45,988 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@77b3be3e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:27:45, skipping insertion in model container [2020-07-20 22:27:45,988 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 10:27:45" (1/1) ... [2020-07-20 22:27:45,996 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 22:27:46,017 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 22:27:46,179 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 22:27:46,183 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 22:27:46,202 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 22:27:46,217 INFO L208 MainTranslator]: Completed translation [2020-07-20 22:27:46,218 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:27:46 WrapperNode [2020-07-20 22:27:46,218 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 22:27:46,218 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 22:27:46,219 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 22:27:46,219 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 22:27:46,232 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:27:46" (1/1) ... [2020-07-20 22:27:46,233 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:27:46" (1/1) ... [2020-07-20 22:27:46,239 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:27:46" (1/1) ... [2020-07-20 22:27:46,239 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:27:46" (1/1) ... [2020-07-20 22:27:46,243 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:27:46" (1/1) ... [2020-07-20 22:27:46,336 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:27:46" (1/1) ... [2020-07-20 22:27:46,339 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:27:46" (1/1) ... [2020-07-20 22:27:46,341 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 22:27:46,342 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 22:27:46,342 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 22:27:46,342 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 22:27:46,343 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:27:46" (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 22:27:46,411 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 22:27:46,411 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 22:27:46,411 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 22:27:46,411 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 22:27:46,412 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 22:27:46,412 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 22:27:46,412 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 22:27:46,413 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 22:27:46,413 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 22:27:46,414 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 22:27:46,414 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 22:27:46,415 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 22:27:46,415 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 22:27:46,647 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 22:27:46,647 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 22:27:46,651 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 10:27:46 BoogieIcfgContainer [2020-07-20 22:27:46,651 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 22:27:46,653 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 22:27:46,653 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 22:27:46,656 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 22:27:46,656 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 10:27:45" (1/3) ... [2020-07-20 22:27:46,657 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@326d714d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 10:27:46, skipping insertion in model container [2020-07-20 22:27:46,658 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:27:46" (2/3) ... [2020-07-20 22:27:46,658 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@326d714d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 10:27:46, skipping insertion in model container [2020-07-20 22:27:46,658 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 10:27:46" (3/3) ... [2020-07-20 22:27:46,660 INFO L109 eAbstractionObserver]: Analyzing ICFG MADWiFi-encode_ie_ok.i [2020-07-20 22:27:46,671 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 22:27:46,679 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 22:27:46,695 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 22:27:46,741 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 22:27:46,744 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 22:27:46,744 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 22:27:46,745 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 22:27:46,745 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 22:27:46,745 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 22:27:46,745 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 22:27:46,745 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 22:27:46,772 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states. [2020-07-20 22:27:46,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-20 22:27:46,781 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:27:46,782 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:27:46,783 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:27:46,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:27:46,790 INFO L82 PathProgramCache]: Analyzing trace with hash 921445730, now seen corresponding path program 1 times [2020-07-20 22:27:46,814 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:27:46,814 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [246223613] [2020-07-20 22:27:46,815 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 22:27:46,898 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:27:46,899 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:27:46,901 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 22:27:46,907 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:27:46,976 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:27:47,013 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 22:27:47,014 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 22:27:47,015 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [246223613] [2020-07-20 22:27:47,016 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 22:27:47,016 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-20 22:27:47,017 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1090061693] [2020-07-20 22:27:47,022 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 22:27:47,023 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:27:47,034 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 22:27:47,035 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-20 22:27:47,037 INFO L87 Difference]: Start difference. First operand 28 states. Second operand 6 states. [2020-07-20 22:27:47,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:27:47,166 INFO L93 Difference]: Finished difference Result 51 states and 67 transitions. [2020-07-20 22:27:47,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 22:27:47,168 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 18 [2020-07-20 22:27:47,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:27:47,178 INFO L225 Difference]: With dead ends: 51 [2020-07-20 22:27:47,178 INFO L226 Difference]: Without dead ends: 28 [2020-07-20 22:27:47,183 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-07-20 22:27:47,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-20 22:27:47,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-07-20 22:27:47,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-20 22:27:47,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-07-20 22:27:47,229 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 18 [2020-07-20 22:27:47,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:27:47,229 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-07-20 22:27:47,230 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 22:27:47,230 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-07-20 22:27:47,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-20 22:27:47,231 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:27:47,232 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:27:47,447 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:27:47,448 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:27:47,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:27:47,449 INFO L82 PathProgramCache]: Analyzing trace with hash 487181509, now seen corresponding path program 1 times [2020-07-20 22:27:47,450 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:27:47,450 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1169817052] [2020-07-20 22:27:47,451 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 22:27:47,488 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:27:47,488 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:27:47,490 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 22:27:47,492 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:27:47,533 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:27:47,572 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:27:47,573 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 22:27:47,573 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1169817052] [2020-07-20 22:27:47,573 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 22:27:47,574 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-20 22:27:47,574 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [384143991] [2020-07-20 22:27:47,577 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 22:27:47,578 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:27:47,578 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 22:27:47,578 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-20 22:27:47,579 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 6 states. [2020-07-20 22:27:47,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:27:47,673 INFO L93 Difference]: Finished difference Result 38 states and 39 transitions. [2020-07-20 22:27:47,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 22:27:47,674 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 23 [2020-07-20 22:27:47,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:27:47,677 INFO L225 Difference]: With dead ends: 38 [2020-07-20 22:27:47,677 INFO L226 Difference]: Without dead ends: 36 [2020-07-20 22:27:47,679 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-07-20 22:27:47,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-20 22:27:47,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-07-20 22:27:47,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 22:27:47,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2020-07-20 22:27:47,693 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 23 [2020-07-20 22:27:47,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:27:47,693 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2020-07-20 22:27:47,694 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 22:27:47,694 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2020-07-20 22:27:47,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-07-20 22:27:47,696 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:27:47,697 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:27:47,910 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:27:47,911 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:27:47,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:27:47,911 INFO L82 PathProgramCache]: Analyzing trace with hash 258938125, now seen corresponding path program 1 times [2020-07-20 22:27:47,912 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:27:47,914 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [505349915] [2020-07-20 22:27:47,915 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 22:27:47,954 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:27:47,955 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:27:47,956 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 22:27:47,959 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:27:48,044 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:27:48,096 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 22:27:48,096 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:27:48,124 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:27:48,271 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [505349915] [2020-07-20 22:27:48,272 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:27:48,272 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-07-20 22:27:48,273 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [682914707] [2020-07-20 22:27:48,273 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 22:27:48,273 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:27:48,274 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 22:27:48,275 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2020-07-20 22:27:48,276 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 9 states. [2020-07-20 22:27:48,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:27:48,444 INFO L93 Difference]: Finished difference Result 47 states and 49 transitions. [2020-07-20 22:27:48,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 22:27:48,444 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 36 [2020-07-20 22:27:48,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:27:48,446 INFO L225 Difference]: With dead ends: 47 [2020-07-20 22:27:48,446 INFO L226 Difference]: Without dead ends: 45 [2020-07-20 22:27:48,447 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 35 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=64, Invalid=176, Unknown=0, NotChecked=0, Total=240 [2020-07-20 22:27:48,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-07-20 22:27:48,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2020-07-20 22:27:48,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-07-20 22:27:48,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2020-07-20 22:27:48,457 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 36 [2020-07-20 22:27:48,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:27:48,458 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2020-07-20 22:27:48,458 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 22:27:48,458 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2020-07-20 22:27:48,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-07-20 22:27:48,460 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:27:48,460 INFO L422 BasicCegarLoop]: trace histogram [6, 5, 5, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:27:48,673 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:27:48,674 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:27:48,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:27:48,675 INFO L82 PathProgramCache]: Analyzing trace with hash -801144379, now seen corresponding path program 2 times [2020-07-20 22:27:48,675 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:27:48,676 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1479739964] [2020-07-20 22:27:48,676 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 22:27:48,714 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:27:48,715 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:27:48,716 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 22:27:48,719 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:27:48,807 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:27:48,843 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 10 proven. 11 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-20 22:27:48,844 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:27:48,864 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:27:48,946 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1479739964] [2020-07-20 22:27:48,947 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:27:48,947 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-07-20 22:27:48,947 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1835486534] [2020-07-20 22:27:48,948 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 22:27:48,948 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:27:48,948 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 22:27:48,948 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2020-07-20 22:27:48,949 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 11 states. [2020-07-20 22:27:49,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:27:49,198 INFO L93 Difference]: Finished difference Result 56 states and 59 transitions. [2020-07-20 22:27:49,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 22:27:49,198 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 49 [2020-07-20 22:27:49,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:27:49,200 INFO L225 Difference]: With dead ends: 56 [2020-07-20 22:27:49,200 INFO L226 Difference]: Without dead ends: 54 [2020-07-20 22:27:49,201 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 46 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=83, Invalid=259, Unknown=0, NotChecked=0, Total=342 [2020-07-20 22:27:49,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-07-20 22:27:49,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-07-20 22:27:49,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-07-20 22:27:49,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2020-07-20 22:27:49,213 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 49 [2020-07-20 22:27:49,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:27:49,214 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2020-07-20 22:27:49,214 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 22:27:49,214 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2020-07-20 22:27:49,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-07-20 22:27:49,216 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:27:49,217 INFO L422 BasicCegarLoop]: trace histogram [8, 7, 7, 4, 4, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:27:49,429 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:27:49,431 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:27:49,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:27:49,432 INFO L82 PathProgramCache]: Analyzing trace with hash -907575283, now seen corresponding path program 3 times [2020-07-20 22:27:49,432 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:27:49,433 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [155547986] [2020-07-20 22:27:49,434 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 22:27:49,478 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:27:49,478 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:27:49,480 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 22:27:49,492 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:27:49,626 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:27:49,673 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 14 proven. 24 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-20 22:27:49,673 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:27:49,694 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:27:49,799 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [155547986] [2020-07-20 22:27:49,800 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:27:49,800 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-07-20 22:27:49,800 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [506368854] [2020-07-20 22:27:49,801 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 22:27:49,801 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:27:49,801 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 22:27:49,802 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=186, Unknown=0, NotChecked=0, Total=240 [2020-07-20 22:27:49,802 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 13 states. [2020-07-20 22:27:50,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:27:50,143 INFO L93 Difference]: Finished difference Result 65 states and 69 transitions. [2020-07-20 22:27:50,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 22:27:50,144 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 62 [2020-07-20 22:27:50,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:27:50,148 INFO L225 Difference]: With dead ends: 65 [2020-07-20 22:27:50,150 INFO L226 Difference]: Without dead ends: 63 [2020-07-20 22:27:50,151 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 57 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=102, Invalid=360, Unknown=0, NotChecked=0, Total=462 [2020-07-20 22:27:50,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-20 22:27:50,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 62. [2020-07-20 22:27:50,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-07-20 22:27:50,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 66 transitions. [2020-07-20 22:27:50,176 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 66 transitions. Word has length 62 [2020-07-20 22:27:50,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:27:50,178 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 66 transitions. [2020-07-20 22:27:50,178 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 22:27:50,179 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 66 transitions. [2020-07-20 22:27:50,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-07-20 22:27:50,183 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:27:50,184 INFO L422 BasicCegarLoop]: trace histogram [10, 9, 9, 5, 5, 5, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:27:50,398 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:27:50,399 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:27:50,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:27:50,400 INFO L82 PathProgramCache]: Analyzing trace with hash -1945307451, now seen corresponding path program 4 times [2020-07-20 22:27:50,400 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:27:50,400 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [996612353] [2020-07-20 22:27:50,400 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 22:27:50,441 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:27:50,442 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:27:50,443 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-20 22:27:50,446 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:27:50,606 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:27:50,652 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 18 proven. 42 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-07-20 22:27:50,652 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:27:50,676 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:27:50,777 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [996612353] [2020-07-20 22:27:50,777 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:27:50,777 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-07-20 22:27:50,777 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [840659582] [2020-07-20 22:27:50,778 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 22:27:50,778 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:27:50,778 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 22:27:50,779 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=242, Unknown=0, NotChecked=0, Total=306 [2020-07-20 22:27:50,779 INFO L87 Difference]: Start difference. First operand 62 states and 66 transitions. Second operand 15 states. [2020-07-20 22:27:51,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:27:51,144 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2020-07-20 22:27:51,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-20 22:27:51,144 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 75 [2020-07-20 22:27:51,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:27:51,146 INFO L225 Difference]: With dead ends: 74 [2020-07-20 22:27:51,146 INFO L226 Difference]: Without dead ends: 72 [2020-07-20 22:27:51,149 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 68 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 134 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=121, Invalid=479, Unknown=0, NotChecked=0, Total=600 [2020-07-20 22:27:51,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-20 22:27:51,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-07-20 22:27:51,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-20 22:27:51,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 76 transitions. [2020-07-20 22:27:51,175 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 76 transitions. Word has length 75 [2020-07-20 22:27:51,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:27:51,179 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 76 transitions. [2020-07-20 22:27:51,180 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 22:27:51,180 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 76 transitions. [2020-07-20 22:27:51,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-07-20 22:27:51,183 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:27:51,183 INFO L422 BasicCegarLoop]: trace histogram [12, 11, 11, 6, 6, 6, 6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:27:51,384 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:27:51,385 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:27:51,385 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:27:51,385 INFO L82 PathProgramCache]: Analyzing trace with hash -1067439347, now seen corresponding path program 5 times [2020-07-20 22:27:51,386 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:27:51,386 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1412199474] [2020-07-20 22:27:51,387 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 22:27:51,431 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:27:51,431 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:27:51,432 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 22:27:51,436 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:27:51,608 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:27:51,659 INFO L134 CoverageAnalysis]: Checked inductivity of 307 backedges. 22 proven. 65 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-07-20 22:27:51,659 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:27:51,686 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:27:51,803 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1412199474] [2020-07-20 22:27:51,804 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:27:51,804 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-07-20 22:27:51,804 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1975654607] [2020-07-20 22:27:51,805 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 22:27:51,805 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:27:51,805 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 22:27:51,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=306, Unknown=0, NotChecked=0, Total=380 [2020-07-20 22:27:51,806 INFO L87 Difference]: Start difference. First operand 71 states and 76 transitions. Second operand 17 states. [2020-07-20 22:27:52,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:27:52,270 INFO L93 Difference]: Finished difference Result 83 states and 89 transitions. [2020-07-20 22:27:52,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-20 22:27:52,271 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 88 [2020-07-20 22:27:52,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:27:52,273 INFO L225 Difference]: With dead ends: 83 [2020-07-20 22:27:52,273 INFO L226 Difference]: Without dead ends: 81 [2020-07-20 22:27:52,274 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 79 SyntacticMatches, 3 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=140, Invalid=616, Unknown=0, NotChecked=0, Total=756 [2020-07-20 22:27:52,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-07-20 22:27:52,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 80. [2020-07-20 22:27:52,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-07-20 22:27:52,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 86 transitions. [2020-07-20 22:27:52,286 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 86 transitions. Word has length 88 [2020-07-20 22:27:52,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:27:52,287 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 86 transitions. [2020-07-20 22:27:52,287 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 22:27:52,287 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 86 transitions. [2020-07-20 22:27:52,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2020-07-20 22:27:52,289 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:27:52,289 INFO L422 BasicCegarLoop]: trace histogram [14, 13, 13, 7, 7, 7, 7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:27:52,504 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:27:52,505 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:27:52,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:27:52,506 INFO L82 PathProgramCache]: Analyzing trace with hash -29217851, now seen corresponding path program 6 times [2020-07-20 22:27:52,507 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:27:52,507 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1928514200] [2020-07-20 22:27:52,508 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 22:27:52,549 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:27:52,550 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:27:52,551 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-20 22:27:52,554 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:27:52,777 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:27:52,829 INFO L134 CoverageAnalysis]: Checked inductivity of 431 backedges. 26 proven. 93 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2020-07-20 22:27:52,829 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:27:52,857 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:27:52,974 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1928514200] [2020-07-20 22:27:52,974 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:27:52,974 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-07-20 22:27:52,974 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [872822037] [2020-07-20 22:27:52,975 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 22:27:52,975 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:27:52,975 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 22:27:52,976 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=378, Unknown=0, NotChecked=0, Total=462 [2020-07-20 22:27:52,976 INFO L87 Difference]: Start difference. First operand 80 states and 86 transitions. Second operand 19 states. [2020-07-20 22:27:53,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:27:53,536 INFO L93 Difference]: Finished difference Result 92 states and 99 transitions. [2020-07-20 22:27:53,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-20 22:27:53,537 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 101 [2020-07-20 22:27:53,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:27:53,540 INFO L225 Difference]: With dead ends: 92 [2020-07-20 22:27:53,540 INFO L226 Difference]: Without dead ends: 90 [2020-07-20 22:27:53,543 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 90 SyntacticMatches, 3 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 241 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=159, Invalid=771, Unknown=0, NotChecked=0, Total=930 [2020-07-20 22:27:53,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-07-20 22:27:53,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-07-20 22:27:53,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-07-20 22:27:53,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 96 transitions. [2020-07-20 22:27:53,559 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 96 transitions. Word has length 101 [2020-07-20 22:27:53,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:27:53,560 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 96 transitions. [2020-07-20 22:27:53,560 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 22:27:53,560 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 96 transitions. [2020-07-20 22:27:53,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2020-07-20 22:27:53,564 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:27:53,564 INFO L422 BasicCegarLoop]: trace histogram [16, 15, 15, 8, 8, 8, 8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:27:53,766 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:27:53,767 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:27:53,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:27:53,767 INFO L82 PathProgramCache]: Analyzing trace with hash 923342349, now seen corresponding path program 7 times [2020-07-20 22:27:53,768 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:27:53,768 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [154199870] [2020-07-20 22:27:53,769 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 22:27:53,823 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:27:53,824 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:27:53,829 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-20 22:27:53,834 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:27:54,064 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:27:54,117 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 30 proven. 126 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-20 22:27:54,118 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:27:54,151 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:27:54,286 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [154199870] [2020-07-20 22:27:54,286 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:27:54,287 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-07-20 22:27:54,287 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1293281444] [2020-07-20 22:27:54,287 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 22:27:54,288 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:27:54,288 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 22:27:54,288 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=458, Unknown=0, NotChecked=0, Total=552 [2020-07-20 22:27:54,289 INFO L87 Difference]: Start difference. First operand 89 states and 96 transitions. Second operand 21 states. [2020-07-20 22:27:54,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:27:54,946 INFO L93 Difference]: Finished difference Result 101 states and 109 transitions. [2020-07-20 22:27:54,946 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-07-20 22:27:54,946 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 114 [2020-07-20 22:27:54,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:27:54,948 INFO L225 Difference]: With dead ends: 101 [2020-07-20 22:27:54,948 INFO L226 Difference]: Without dead ends: 99 [2020-07-20 22:27:54,949 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 101 SyntacticMatches, 3 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 305 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=178, Invalid=944, Unknown=0, NotChecked=0, Total=1122 [2020-07-20 22:27:54,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2020-07-20 22:27:54,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 98. [2020-07-20 22:27:54,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2020-07-20 22:27:54,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 106 transitions. [2020-07-20 22:27:54,962 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 106 transitions. Word has length 114 [2020-07-20 22:27:54,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:27:54,962 INFO L479 AbstractCegarLoop]: Abstraction has 98 states and 106 transitions. [2020-07-20 22:27:54,962 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 22:27:54,963 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 106 transitions. [2020-07-20 22:27:54,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2020-07-20 22:27:54,964 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:27:54,965 INFO L422 BasicCegarLoop]: trace histogram [18, 17, 17, 9, 9, 9, 9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:27:55,177 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:27:55,178 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:27:55,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:27:55,178 INFO L82 PathProgramCache]: Analyzing trace with hash 816783557, now seen corresponding path program 8 times [2020-07-20 22:27:55,178 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:27:55,179 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [528886895] [2020-07-20 22:27:55,180 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 22:27:55,227 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:27:55,228 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:27:55,229 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 25 conjunts are in the unsatisfiable core [2020-07-20 22:27:55,232 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:27:55,535 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:27:55,599 INFO L134 CoverageAnalysis]: Checked inductivity of 742 backedges. 34 proven. 164 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2020-07-20 22:27:55,599 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:27:55,633 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:27:55,768 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [528886895] [2020-07-20 22:27:55,769 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:27:55,769 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-07-20 22:27:55,769 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [627625199] [2020-07-20 22:27:55,770 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 22:27:55,770 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:27:55,771 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 22:27:55,771 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=546, Unknown=0, NotChecked=0, Total=650 [2020-07-20 22:27:55,771 INFO L87 Difference]: Start difference. First operand 98 states and 106 transitions. Second operand 23 states. [2020-07-20 22:27:56,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:27:56,537 INFO L93 Difference]: Finished difference Result 110 states and 119 transitions. [2020-07-20 22:27:56,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-07-20 22:27:56,538 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 127 [2020-07-20 22:27:56,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:27:56,539 INFO L225 Difference]: With dead ends: 110 [2020-07-20 22:27:56,539 INFO L226 Difference]: Without dead ends: 108 [2020-07-20 22:27:56,540 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 112 SyntacticMatches, 3 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 376 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=197, Invalid=1135, Unknown=0, NotChecked=0, Total=1332 [2020-07-20 22:27:56,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-20 22:27:56,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-07-20 22:27:56,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-07-20 22:27:56,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 116 transitions. [2020-07-20 22:27:56,557 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 116 transitions. Word has length 127 [2020-07-20 22:27:56,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:27:56,557 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 116 transitions. [2020-07-20 22:27:56,558 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 22:27:56,558 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 116 transitions. [2020-07-20 22:27:56,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2020-07-20 22:27:56,560 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:27:56,560 INFO L422 BasicCegarLoop]: trace histogram [20, 19, 19, 10, 10, 10, 10, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:27:56,773 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:27:56,774 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:27:56,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:27:56,775 INFO L82 PathProgramCache]: Analyzing trace with hash -1777188595, now seen corresponding path program 9 times [2020-07-20 22:27:56,775 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:27:56,776 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1953782824] [2020-07-20 22:27:56,776 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 22:27:56,823 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:27:56,823 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:27:56,824 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-20 22:27:56,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:27:57,141 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:27:57,217 INFO L134 CoverageAnalysis]: Checked inductivity of 929 backedges. 38 proven. 207 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2020-07-20 22:27:57,217 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:27:57,262 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:27:57,400 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1953782824] [2020-07-20 22:27:57,400 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:27:57,401 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-07-20 22:27:57,401 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [311806384] [2020-07-20 22:27:57,401 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 22:27:57,402 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:27:57,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 22:27:57,402 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=642, Unknown=0, NotChecked=0, Total=756 [2020-07-20 22:27:57,403 INFO L87 Difference]: Start difference. First operand 107 states and 116 transitions. Second operand 25 states. [2020-07-20 22:27:58,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:27:58,278 INFO L93 Difference]: Finished difference Result 119 states and 129 transitions. [2020-07-20 22:27:58,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-20 22:27:58,278 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 140 [2020-07-20 22:27:58,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:27:58,281 INFO L225 Difference]: With dead ends: 119 [2020-07-20 22:27:58,281 INFO L226 Difference]: Without dead ends: 117 [2020-07-20 22:27:58,283 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 123 SyntacticMatches, 3 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 454 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=216, Invalid=1344, Unknown=0, NotChecked=0, Total=1560 [2020-07-20 22:27:58,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2020-07-20 22:27:58,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 116. [2020-07-20 22:27:58,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2020-07-20 22:27:58,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 126 transitions. [2020-07-20 22:27:58,297 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 126 transitions. Word has length 140 [2020-07-20 22:27:58,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:27:58,297 INFO L479 AbstractCegarLoop]: Abstraction has 116 states and 126 transitions. [2020-07-20 22:27:58,297 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 22:27:58,297 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 126 transitions. [2020-07-20 22:27:58,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2020-07-20 22:27:58,299 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:27:58,299 INFO L422 BasicCegarLoop]: trace histogram [22, 21, 21, 11, 11, 11, 11, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:27:58,513 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:27:58,513 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:27:58,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:27:58,514 INFO L82 PathProgramCache]: Analyzing trace with hash -1994140219, now seen corresponding path program 10 times [2020-07-20 22:27:58,515 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:27:58,515 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1108205694] [2020-07-20 22:27:58,516 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 22:27:58,567 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:27:58,568 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:27:58,569 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 29 conjunts are in the unsatisfiable core [2020-07-20 22:27:58,573 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:27:58,960 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:27:59,042 INFO L134 CoverageAnalysis]: Checked inductivity of 1137 backedges. 42 proven. 255 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2020-07-20 22:27:59,042 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:27:59,080 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:27:59,238 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1108205694] [2020-07-20 22:27:59,238 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:27:59,239 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-07-20 22:27:59,239 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [213866794] [2020-07-20 22:27:59,239 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 22:27:59,239 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:27:59,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 22:27:59,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=746, Unknown=0, NotChecked=0, Total=870 [2020-07-20 22:27:59,240 INFO L87 Difference]: Start difference. First operand 116 states and 126 transitions. Second operand 27 states. [2020-07-20 22:28:00,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:28:00,207 INFO L93 Difference]: Finished difference Result 128 states and 139 transitions. [2020-07-20 22:28:00,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-07-20 22:28:00,208 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 153 [2020-07-20 22:28:00,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:28:00,209 INFO L225 Difference]: With dead ends: 128 [2020-07-20 22:28:00,209 INFO L226 Difference]: Without dead ends: 126 [2020-07-20 22:28:00,211 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 134 SyntacticMatches, 3 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 539 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=235, Invalid=1571, Unknown=0, NotChecked=0, Total=1806 [2020-07-20 22:28:00,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2020-07-20 22:28:00,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 125. [2020-07-20 22:28:00,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2020-07-20 22:28:00,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 136 transitions. [2020-07-20 22:28:00,222 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 136 transitions. Word has length 153 [2020-07-20 22:28:00,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:28:00,223 INFO L479 AbstractCegarLoop]: Abstraction has 125 states and 136 transitions. [2020-07-20 22:28:00,223 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 22:28:00,223 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 136 transitions. [2020-07-20 22:28:00,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2020-07-20 22:28:00,226 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:28:00,226 INFO L422 BasicCegarLoop]: trace histogram [24, 23, 23, 12, 12, 12, 12, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:28:00,439 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:28:00,440 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:28:00,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:28:00,440 INFO L82 PathProgramCache]: Analyzing trace with hash 1772858381, now seen corresponding path program 11 times [2020-07-20 22:28:00,440 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:28:00,440 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [600223440] [2020-07-20 22:28:00,441 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 22:28:00,511 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:28:00,511 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:28:00,513 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 31 conjunts are in the unsatisfiable core [2020-07-20 22:28:00,516 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:28:00,927 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:28:01,040 INFO L134 CoverageAnalysis]: Checked inductivity of 1366 backedges. 46 proven. 308 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2020-07-20 22:28:01,041 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:28:01,089 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:28:01,241 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [600223440] [2020-07-20 22:28:01,241 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:28:01,241 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-07-20 22:28:01,242 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [141356323] [2020-07-20 22:28:01,242 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 22:28:01,242 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:28:01,243 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 22:28:01,243 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=858, Unknown=0, NotChecked=0, Total=992 [2020-07-20 22:28:01,243 INFO L87 Difference]: Start difference. First operand 125 states and 136 transitions. Second operand 29 states. [2020-07-20 22:28:02,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:28:02,378 INFO L93 Difference]: Finished difference Result 137 states and 149 transitions. [2020-07-20 22:28:02,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-07-20 22:28:02,379 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 166 [2020-07-20 22:28:02,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:28:02,382 INFO L225 Difference]: With dead ends: 137 [2020-07-20 22:28:02,383 INFO L226 Difference]: Without dead ends: 135 [2020-07-20 22:28:02,384 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 145 SyntacticMatches, 3 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 631 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=254, Invalid=1816, Unknown=0, NotChecked=0, Total=2070 [2020-07-20 22:28:02,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2020-07-20 22:28:02,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 134. [2020-07-20 22:28:02,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 134 states. [2020-07-20 22:28:02,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 146 transitions. [2020-07-20 22:28:02,395 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 146 transitions. Word has length 166 [2020-07-20 22:28:02,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:28:02,396 INFO L479 AbstractCegarLoop]: Abstraction has 134 states and 146 transitions. [2020-07-20 22:28:02,396 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 22:28:02,396 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 146 transitions. [2020-07-20 22:28:02,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2020-07-20 22:28:02,398 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:28:02,398 INFO L422 BasicCegarLoop]: trace histogram [26, 25, 25, 13, 13, 13, 13, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:28:02,613 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:28:02,614 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:28:02,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:28:02,615 INFO L82 PathProgramCache]: Analyzing trace with hash -915387707, now seen corresponding path program 12 times [2020-07-20 22:28:02,615 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:28:02,615 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1426687019] [2020-07-20 22:28:02,616 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 22:28:02,677 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:28:02,677 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:28:02,679 INFO L263 TraceCheckSpWp]: Trace formula consists of 302 conjuncts, 33 conjunts are in the unsatisfiable core [2020-07-20 22:28:02,685 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:28:03,106 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:28:03,203 INFO L134 CoverageAnalysis]: Checked inductivity of 1616 backedges. 50 proven. 366 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2020-07-20 22:28:03,203 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:28:03,249 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:28:03,440 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1426687019] [2020-07-20 22:28:03,440 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:28:03,440 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-07-20 22:28:03,440 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1529314189] [2020-07-20 22:28:03,441 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-20 22:28:03,441 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:28:03,441 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-20 22:28:03,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=978, Unknown=0, NotChecked=0, Total=1122 [2020-07-20 22:28:03,442 INFO L87 Difference]: Start difference. First operand 134 states and 146 transitions. Second operand 31 states. [2020-07-20 22:28:04,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:28:04,717 INFO L93 Difference]: Finished difference Result 146 states and 159 transitions. [2020-07-20 22:28:04,717 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-07-20 22:28:04,718 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 179 [2020-07-20 22:28:04,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:28:04,720 INFO L225 Difference]: With dead ends: 146 [2020-07-20 22:28:04,720 INFO L226 Difference]: Without dead ends: 144 [2020-07-20 22:28:04,721 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 156 SyntacticMatches, 3 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 730 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=273, Invalid=2079, Unknown=0, NotChecked=0, Total=2352 [2020-07-20 22:28:04,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2020-07-20 22:28:04,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 143. [2020-07-20 22:28:04,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 143 states. [2020-07-20 22:28:04,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 156 transitions. [2020-07-20 22:28:04,733 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 156 transitions. Word has length 179 [2020-07-20 22:28:04,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:28:04,734 INFO L479 AbstractCegarLoop]: Abstraction has 143 states and 156 transitions. [2020-07-20 22:28:04,734 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-20 22:28:04,734 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 156 transitions. [2020-07-20 22:28:04,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 193 [2020-07-20 22:28:04,735 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:28:04,736 INFO L422 BasicCegarLoop]: trace histogram [28, 27, 27, 14, 14, 14, 14, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:28:04,937 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:28:04,938 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:28:04,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:28:04,939 INFO L82 PathProgramCache]: Analyzing trace with hash 1644517133, now seen corresponding path program 13 times [2020-07-20 22:28:04,939 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:28:04,939 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [890498993] [2020-07-20 22:28:04,940 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 22:28:04,997 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:28:04,998 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:28:04,999 INFO L263 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 35 conjunts are in the unsatisfiable core [2020-07-20 22:28:05,002 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:28:05,574 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:28:05,675 INFO L134 CoverageAnalysis]: Checked inductivity of 1887 backedges. 54 proven. 429 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2020-07-20 22:28:05,675 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:28:05,725 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:28:05,913 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [890498993] [2020-07-20 22:28:05,913 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:28:05,914 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-07-20 22:28:05,914 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [995028669] [2020-07-20 22:28:05,914 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-20 22:28:05,915 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:28:05,915 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-20 22:28:05,915 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=1106, Unknown=0, NotChecked=0, Total=1260 [2020-07-20 22:28:05,916 INFO L87 Difference]: Start difference. First operand 143 states and 156 transitions. Second operand 33 states. [2020-07-20 22:28:07,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:28:07,393 INFO L93 Difference]: Finished difference Result 155 states and 169 transitions. [2020-07-20 22:28:07,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-07-20 22:28:07,393 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 192 [2020-07-20 22:28:07,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:28:07,395 INFO L225 Difference]: With dead ends: 155 [2020-07-20 22:28:07,395 INFO L226 Difference]: Without dead ends: 153 [2020-07-20 22:28:07,397 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 167 SyntacticMatches, 3 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 836 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=292, Invalid=2360, Unknown=0, NotChecked=0, Total=2652 [2020-07-20 22:28:07,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2020-07-20 22:28:07,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 152. [2020-07-20 22:28:07,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 152 states. [2020-07-20 22:28:07,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 166 transitions. [2020-07-20 22:28:07,422 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 166 transitions. Word has length 192 [2020-07-20 22:28:07,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:28:07,423 INFO L479 AbstractCegarLoop]: Abstraction has 152 states and 166 transitions. [2020-07-20 22:28:07,423 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-20 22:28:07,424 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 166 transitions. [2020-07-20 22:28:07,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2020-07-20 22:28:07,427 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:28:07,427 INFO L422 BasicCegarLoop]: trace histogram [30, 29, 29, 15, 15, 15, 15, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:28:07,642 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:28:07,643 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:28:07,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:28:07,644 INFO L82 PathProgramCache]: Analyzing trace with hash 258244549, now seen corresponding path program 14 times [2020-07-20 22:28:07,644 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:28:07,644 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1008218679] [2020-07-20 22:28:07,645 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 22:28:07,710 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:28:07,710 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:28:07,711 INFO L263 TraceCheckSpWp]: Trace formula consists of 345 conjuncts, 37 conjunts are in the unsatisfiable core [2020-07-20 22:28:07,714 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:28:08,309 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:28:08,446 INFO L134 CoverageAnalysis]: Checked inductivity of 2179 backedges. 58 proven. 497 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2020-07-20 22:28:08,446 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:28:08,499 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:28:08,691 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1008218679] [2020-07-20 22:28:08,692 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:28:08,692 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-07-20 22:28:08,692 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1472229809] [2020-07-20 22:28:08,693 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-20 22:28:08,693 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:28:08,693 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-20 22:28:08,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=1242, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 22:28:08,694 INFO L87 Difference]: Start difference. First operand 152 states and 166 transitions. Second operand 35 states. [2020-07-20 22:28:10,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:28:10,399 INFO L93 Difference]: Finished difference Result 164 states and 179 transitions. [2020-07-20 22:28:10,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-07-20 22:28:10,400 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 205 [2020-07-20 22:28:10,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:28:10,401 INFO L225 Difference]: With dead ends: 164 [2020-07-20 22:28:10,401 INFO L226 Difference]: Without dead ends: 162 [2020-07-20 22:28:10,403 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 178 SyntacticMatches, 3 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 949 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=311, Invalid=2659, Unknown=0, NotChecked=0, Total=2970 [2020-07-20 22:28:10,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2020-07-20 22:28:10,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 161. [2020-07-20 22:28:10,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 161 states. [2020-07-20 22:28:10,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 176 transitions. [2020-07-20 22:28:10,417 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 176 transitions. Word has length 205 [2020-07-20 22:28:10,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:28:10,418 INFO L479 AbstractCegarLoop]: Abstraction has 161 states and 176 transitions. [2020-07-20 22:28:10,419 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-07-20 22:28:10,419 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 176 transitions. [2020-07-20 22:28:10,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 219 [2020-07-20 22:28:10,423 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:28:10,423 INFO L422 BasicCegarLoop]: trace histogram [32, 31, 31, 16, 16, 16, 16, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:28:10,637 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:28:10,638 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:28:10,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:28:10,639 INFO L82 PathProgramCache]: Analyzing trace with hash 1397703181, now seen corresponding path program 15 times [2020-07-20 22:28:10,639 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:28:10,639 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [265053880] [2020-07-20 22:28:10,640 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 22:28:10,708 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:28:10,708 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:28:10,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 39 conjunts are in the unsatisfiable core [2020-07-20 22:28:10,714 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:28:11,407 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:28:11,530 INFO L134 CoverageAnalysis]: Checked inductivity of 2492 backedges. 62 proven. 570 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-20 22:28:11,530 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:28:11,585 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:28:11,792 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [265053880] [2020-07-20 22:28:11,793 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:28:11,793 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-07-20 22:28:11,793 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [961931526] [2020-07-20 22:28:11,794 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-07-20 22:28:11,794 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:28:11,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-07-20 22:28:11,795 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=1386, Unknown=0, NotChecked=0, Total=1560 [2020-07-20 22:28:11,795 INFO L87 Difference]: Start difference. First operand 161 states and 176 transitions. Second operand 37 states. [2020-07-20 22:28:13,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:28:13,695 INFO L93 Difference]: Finished difference Result 173 states and 189 transitions. [2020-07-20 22:28:13,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-07-20 22:28:13,695 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 218 [2020-07-20 22:28:13,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:28:13,697 INFO L225 Difference]: With dead ends: 173 [2020-07-20 22:28:13,697 INFO L226 Difference]: Without dead ends: 171 [2020-07-20 22:28:13,699 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 189 SyntacticMatches, 3 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1069 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=330, Invalid=2976, Unknown=0, NotChecked=0, Total=3306 [2020-07-20 22:28:13,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2020-07-20 22:28:13,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 170. [2020-07-20 22:28:13,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 170 states. [2020-07-20 22:28:13,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 186 transitions. [2020-07-20 22:28:13,712 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 186 transitions. Word has length 218 [2020-07-20 22:28:13,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:28:13,713 INFO L479 AbstractCegarLoop]: Abstraction has 170 states and 186 transitions. [2020-07-20 22:28:13,713 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-07-20 22:28:13,713 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 186 transitions. [2020-07-20 22:28:13,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 232 [2020-07-20 22:28:13,715 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:28:13,715 INFO L422 BasicCegarLoop]: trace histogram [34, 33, 33, 17, 17, 17, 17, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:28:13,929 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:28:13,930 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:28:13,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:28:13,931 INFO L82 PathProgramCache]: Analyzing trace with hash -724536123, now seen corresponding path program 16 times [2020-07-20 22:28:13,931 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:28:13,931 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [492295989] [2020-07-20 22:28:13,932 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 22:28:14,002 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:28:14,003 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:28:14,004 INFO L263 TraceCheckSpWp]: Trace formula consists of 385 conjuncts, 41 conjunts are in the unsatisfiable core [2020-07-20 22:28:14,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:28:14,788 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:28:14,949 INFO L134 CoverageAnalysis]: Checked inductivity of 2826 backedges. 66 proven. 648 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2020-07-20 22:28:14,950 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:28:15,010 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:28:15,235 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [492295989] [2020-07-20 22:28:15,236 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:28:15,236 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-07-20 22:28:15,236 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1311718658] [2020-07-20 22:28:15,237 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-07-20 22:28:15,237 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:28:15,237 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-07-20 22:28:15,238 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1538, Unknown=0, NotChecked=0, Total=1722 [2020-07-20 22:28:15,238 INFO L87 Difference]: Start difference. First operand 170 states and 186 transitions. Second operand 39 states. [2020-07-20 22:28:17,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:28:17,444 INFO L93 Difference]: Finished difference Result 182 states and 199 transitions. [2020-07-20 22:28:17,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2020-07-20 22:28:17,445 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 231 [2020-07-20 22:28:17,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:28:17,448 INFO L225 Difference]: With dead ends: 182 [2020-07-20 22:28:17,449 INFO L226 Difference]: Without dead ends: 180 [2020-07-20 22:28:17,450 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 262 GetRequests, 200 SyntacticMatches, 3 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1196 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=349, Invalid=3311, Unknown=0, NotChecked=0, Total=3660 [2020-07-20 22:28:17,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2020-07-20 22:28:17,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 179. [2020-07-20 22:28:17,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 179 states. [2020-07-20 22:28:17,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 196 transitions. [2020-07-20 22:28:17,464 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 196 transitions. Word has length 231 [2020-07-20 22:28:17,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:28:17,465 INFO L479 AbstractCegarLoop]: Abstraction has 179 states and 196 transitions. [2020-07-20 22:28:17,465 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-07-20 22:28:17,465 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 196 transitions. [2020-07-20 22:28:17,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 245 [2020-07-20 22:28:17,467 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:28:17,467 INFO L422 BasicCegarLoop]: trace histogram [36, 35, 35, 18, 18, 18, 18, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:28:17,680 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:28:17,681 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:28:17,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:28:17,682 INFO L82 PathProgramCache]: Analyzing trace with hash 901344525, now seen corresponding path program 17 times [2020-07-20 22:28:17,682 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:28:17,682 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [127172779] [2020-07-20 22:28:17,683 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 22:28:17,758 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:28:17,758 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:28:17,761 INFO L263 TraceCheckSpWp]: Trace formula consists of 405 conjuncts, 43 conjunts are in the unsatisfiable core [2020-07-20 22:28:17,766 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:28:18,607 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:28:18,751 INFO L134 CoverageAnalysis]: Checked inductivity of 3181 backedges. 70 proven. 731 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2020-07-20 22:28:18,752 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:28:18,817 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:28:19,054 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [127172779] [2020-07-20 22:28:19,054 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:28:19,055 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-07-20 22:28:19,055 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1244990978] [2020-07-20 22:28:19,056 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-07-20 22:28:19,056 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:28:19,056 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-07-20 22:28:19,057 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=1698, Unknown=0, NotChecked=0, Total=1892 [2020-07-20 22:28:19,057 INFO L87 Difference]: Start difference. First operand 179 states and 196 transitions. Second operand 41 states. [2020-07-20 22:28:21,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:28:21,403 INFO L93 Difference]: Finished difference Result 191 states and 209 transitions. [2020-07-20 22:28:21,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2020-07-20 22:28:21,404 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 244 [2020-07-20 22:28:21,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:28:21,406 INFO L225 Difference]: With dead ends: 191 [2020-07-20 22:28:21,406 INFO L226 Difference]: Without dead ends: 189 [2020-07-20 22:28:21,408 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 211 SyntacticMatches, 3 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1330 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=368, Invalid=3664, Unknown=0, NotChecked=0, Total=4032 [2020-07-20 22:28:21,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2020-07-20 22:28:21,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 188. [2020-07-20 22:28:21,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 188 states. [2020-07-20 22:28:21,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 206 transitions. [2020-07-20 22:28:21,423 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 206 transitions. Word has length 244 [2020-07-20 22:28:21,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:28:21,423 INFO L479 AbstractCegarLoop]: Abstraction has 188 states and 206 transitions. [2020-07-20 22:28:21,423 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-07-20 22:28:21,424 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 206 transitions. [2020-07-20 22:28:21,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 258 [2020-07-20 22:28:21,425 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:28:21,426 INFO L422 BasicCegarLoop]: trace histogram [38, 37, 37, 19, 19, 19, 19, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:28:21,639 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:28:21,639 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:28:21,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:28:21,640 INFO L82 PathProgramCache]: Analyzing trace with hash -276551227, now seen corresponding path program 18 times [2020-07-20 22:28:21,640 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:28:21,640 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [81320523] [2020-07-20 22:28:21,641 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 22:28:21,716 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:28:21,716 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:28:21,718 INFO L263 TraceCheckSpWp]: Trace formula consists of 428 conjuncts, 45 conjunts are in the unsatisfiable core [2020-07-20 22:28:21,724 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:28:22,656 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:28:22,813 INFO L134 CoverageAnalysis]: Checked inductivity of 3557 backedges. 74 proven. 819 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2020-07-20 22:28:22,814 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:28:22,881 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:28:23,126 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [81320523] [2020-07-20 22:28:23,127 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:28:23,127 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-07-20 22:28:23,127 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1973801304] [2020-07-20 22:28:23,128 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-07-20 22:28:23,128 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:28:23,128 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-07-20 22:28:23,129 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=204, Invalid=1866, Unknown=0, NotChecked=0, Total=2070 [2020-07-20 22:28:23,129 INFO L87 Difference]: Start difference. First operand 188 states and 206 transitions. Second operand 43 states. [2020-07-20 22:28:25,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:28:25,571 INFO L93 Difference]: Finished difference Result 200 states and 219 transitions. [2020-07-20 22:28:25,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2020-07-20 22:28:25,572 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 257 [2020-07-20 22:28:25,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:28:25,577 INFO L225 Difference]: With dead ends: 200 [2020-07-20 22:28:25,577 INFO L226 Difference]: Without dead ends: 198 [2020-07-20 22:28:25,579 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 222 SyntacticMatches, 3 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1471 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=387, Invalid=4035, Unknown=0, NotChecked=0, Total=4422 [2020-07-20 22:28:25,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2020-07-20 22:28:25,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 197. [2020-07-20 22:28:25,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 197 states. [2020-07-20 22:28:25,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 216 transitions. [2020-07-20 22:28:25,598 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 216 transitions. Word has length 257 [2020-07-20 22:28:25,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:28:25,599 INFO L479 AbstractCegarLoop]: Abstraction has 197 states and 216 transitions. [2020-07-20 22:28:25,599 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-07-20 22:28:25,599 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 216 transitions. [2020-07-20 22:28:25,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 271 [2020-07-20 22:28:25,601 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:28:25,602 INFO L422 BasicCegarLoop]: trace histogram [40, 39, 39, 20, 20, 20, 20, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:28:25,804 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:28:25,805 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:28:25,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:28:25,806 INFO L82 PathProgramCache]: Analyzing trace with hash 628348941, now seen corresponding path program 19 times [2020-07-20 22:28:25,806 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:28:25,806 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1095528204] [2020-07-20 22:28:25,806 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 22:28:25,887 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:28:25,887 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:28:25,889 INFO L263 TraceCheckSpWp]: Trace formula consists of 448 conjuncts, 47 conjunts are in the unsatisfiable core [2020-07-20 22:28:25,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:28:26,945 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:28:27,114 INFO L134 CoverageAnalysis]: Checked inductivity of 3954 backedges. 78 proven. 912 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2020-07-20 22:28:27,114 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:28:27,186 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:28:27,437 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1095528204] [2020-07-20 22:28:27,438 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:28:27,438 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-07-20 22:28:27,438 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [85774304] [2020-07-20 22:28:27,439 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-07-20 22:28:27,439 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:28:27,439 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-07-20 22:28:27,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=2042, Unknown=0, NotChecked=0, Total=2256 [2020-07-20 22:28:27,440 INFO L87 Difference]: Start difference. First operand 197 states and 216 transitions. Second operand 45 states. [2020-07-20 22:28:30,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:28:30,187 INFO L93 Difference]: Finished difference Result 209 states and 229 transitions. [2020-07-20 22:28:30,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2020-07-20 22:28:30,187 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 270 [2020-07-20 22:28:30,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:28:30,191 INFO L225 Difference]: With dead ends: 209 [2020-07-20 22:28:30,191 INFO L226 Difference]: Without dead ends: 207 [2020-07-20 22:28:30,193 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 233 SyntacticMatches, 3 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1619 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=406, Invalid=4424, Unknown=0, NotChecked=0, Total=4830 [2020-07-20 22:28:30,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2020-07-20 22:28:30,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 206. [2020-07-20 22:28:30,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 206 states. [2020-07-20 22:28:30,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 226 transitions. [2020-07-20 22:28:30,211 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 226 transitions. Word has length 270 [2020-07-20 22:28:30,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:28:30,212 INFO L479 AbstractCegarLoop]: Abstraction has 206 states and 226 transitions. [2020-07-20 22:28:30,212 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-07-20 22:28:30,212 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 226 transitions. [2020-07-20 22:28:30,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 284 [2020-07-20 22:28:30,214 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:28:30,215 INFO L422 BasicCegarLoop]: trace histogram [42, 41, 41, 21, 21, 21, 21, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:28:30,428 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:28:30,429 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:28:30,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:28:30,429 INFO L82 PathProgramCache]: Analyzing trace with hash -1857052987, now seen corresponding path program 20 times [2020-07-20 22:28:30,430 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:28:30,430 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1281249948] [2020-07-20 22:28:30,430 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 22:28:30,537 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:28:30,537 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:28:30,540 INFO L263 TraceCheckSpWp]: Trace formula consists of 468 conjuncts, 49 conjunts are in the unsatisfiable core [2020-07-20 22:28:30,547 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:28:31,697 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:28:31,881 INFO L134 CoverageAnalysis]: Checked inductivity of 4372 backedges. 82 proven. 1010 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2020-07-20 22:28:31,881 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:28:31,959 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:28:32,241 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1281249948] [2020-07-20 22:28:32,242 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:28:32,242 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-07-20 22:28:32,242 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [975562457] [2020-07-20 22:28:32,243 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-07-20 22:28:32,243 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:28:32,243 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-07-20 22:28:32,244 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=224, Invalid=2226, Unknown=0, NotChecked=0, Total=2450 [2020-07-20 22:28:32,244 INFO L87 Difference]: Start difference. First operand 206 states and 226 transitions. Second operand 47 states. [2020-07-20 22:28:35,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:28:35,178 INFO L93 Difference]: Finished difference Result 218 states and 239 transitions. [2020-07-20 22:28:35,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2020-07-20 22:28:35,182 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 283 [2020-07-20 22:28:35,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:28:35,184 INFO L225 Difference]: With dead ends: 218 [2020-07-20 22:28:35,184 INFO L226 Difference]: Without dead ends: 216 [2020-07-20 22:28:35,185 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 244 SyntacticMatches, 3 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1774 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=425, Invalid=4831, Unknown=0, NotChecked=0, Total=5256 [2020-07-20 22:28:35,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2020-07-20 22:28:35,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 215. [2020-07-20 22:28:35,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 215 states. [2020-07-20 22:28:35,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 236 transitions. [2020-07-20 22:28:35,206 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 236 transitions. Word has length 283 [2020-07-20 22:28:35,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:28:35,207 INFO L479 AbstractCegarLoop]: Abstraction has 215 states and 236 transitions. [2020-07-20 22:28:35,207 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-07-20 22:28:35,207 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 236 transitions. [2020-07-20 22:28:35,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 297 [2020-07-20 22:28:35,209 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:28:35,210 INFO L422 BasicCegarLoop]: trace histogram [44, 43, 43, 22, 22, 22, 22, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:28:35,421 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:28:35,422 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:28:35,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:28:35,423 INFO L82 PathProgramCache]: Analyzing trace with hash 1655603981, now seen corresponding path program 21 times [2020-07-20 22:28:35,423 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:28:35,423 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [845355999] [2020-07-20 22:28:35,424 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 22:28:35,512 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:28:35,512 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:28:35,515 INFO L263 TraceCheckSpWp]: Trace formula consists of 488 conjuncts, 51 conjunts are in the unsatisfiable core [2020-07-20 22:28:35,520 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:28:36,878 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:28:37,085 INFO L134 CoverageAnalysis]: Checked inductivity of 4811 backedges. 86 proven. 1113 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2020-07-20 22:28:37,085 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:28:37,168 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:28:37,466 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [845355999] [2020-07-20 22:28:37,467 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:28:37,467 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-07-20 22:28:37,468 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1734211729] [2020-07-20 22:28:37,468 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-07-20 22:28:37,469 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:28:37,469 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-07-20 22:28:37,469 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=234, Invalid=2418, Unknown=0, NotChecked=0, Total=2652 [2020-07-20 22:28:37,469 INFO L87 Difference]: Start difference. First operand 215 states and 236 transitions. Second operand 49 states. [2020-07-20 22:28:41,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:28:41,061 INFO L93 Difference]: Finished difference Result 227 states and 249 transitions. [2020-07-20 22:28:41,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2020-07-20 22:28:41,062 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 296 [2020-07-20 22:28:41,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:28:41,067 INFO L225 Difference]: With dead ends: 227 [2020-07-20 22:28:41,067 INFO L226 Difference]: Without dead ends: 225 [2020-07-20 22:28:41,068 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 255 SyntacticMatches, 3 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1936 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=444, Invalid=5256, Unknown=0, NotChecked=0, Total=5700 [2020-07-20 22:28:41,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2020-07-20 22:28:41,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 224. [2020-07-20 22:28:41,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 224 states. [2020-07-20 22:28:41,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 246 transitions. [2020-07-20 22:28:41,096 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 246 transitions. Word has length 296 [2020-07-20 22:28:41,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:28:41,100 INFO L479 AbstractCegarLoop]: Abstraction has 224 states and 246 transitions. [2020-07-20 22:28:41,100 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-07-20 22:28:41,100 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 246 transitions. [2020-07-20 22:28:41,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 310 [2020-07-20 22:28:41,103 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:28:41,103 INFO L422 BasicCegarLoop]: trace histogram [46, 45, 45, 23, 23, 23, 23, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:28:41,317 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:28:41,318 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:28:41,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:28:41,318 INFO L82 PathProgramCache]: Analyzing trace with hash 1208144837, now seen corresponding path program 22 times [2020-07-20 22:28:41,318 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:28:41,319 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [934910768] [2020-07-20 22:28:41,319 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 22:28:41,421 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:28:41,421 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:28:41,425 INFO L263 TraceCheckSpWp]: Trace formula consists of 511 conjuncts, 53 conjunts are in the unsatisfiable core [2020-07-20 22:28:41,431 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:28:42,754 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:28:42,966 INFO L134 CoverageAnalysis]: Checked inductivity of 5271 backedges. 90 proven. 1221 refuted. 0 times theorem prover too weak. 3960 trivial. 0 not checked. [2020-07-20 22:28:42,967 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:28:43,053 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:28:43,369 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [934910768] [2020-07-20 22:28:43,369 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:28:43,369 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51] total 51 [2020-07-20 22:28:43,370 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1418774195] [2020-07-20 22:28:43,370 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2020-07-20 22:28:43,370 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:28:43,371 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2020-07-20 22:28:43,371 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=244, Invalid=2618, Unknown=0, NotChecked=0, Total=2862 [2020-07-20 22:28:43,371 INFO L87 Difference]: Start difference. First operand 224 states and 246 transitions. Second operand 51 states. [2020-07-20 22:28:46,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:28:46,948 INFO L93 Difference]: Finished difference Result 236 states and 259 transitions. [2020-07-20 22:28:46,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2020-07-20 22:28:46,949 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 309 [2020-07-20 22:28:46,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:28:46,951 INFO L225 Difference]: With dead ends: 236 [2020-07-20 22:28:46,951 INFO L226 Difference]: Without dead ends: 234 [2020-07-20 22:28:46,953 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 266 SyntacticMatches, 3 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2105 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=463, Invalid=5699, Unknown=0, NotChecked=0, Total=6162 [2020-07-20 22:28:46,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 234 states. [2020-07-20 22:28:46,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 234 to 233. [2020-07-20 22:28:46,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 233 states. [2020-07-20 22:28:46,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 256 transitions. [2020-07-20 22:28:46,973 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 256 transitions. Word has length 309 [2020-07-20 22:28:46,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:28:46,973 INFO L479 AbstractCegarLoop]: Abstraction has 233 states and 256 transitions. [2020-07-20 22:28:46,974 INFO L480 AbstractCegarLoop]: Interpolant automaton has 51 states. [2020-07-20 22:28:46,974 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 256 transitions. [2020-07-20 22:28:46,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 323 [2020-07-20 22:28:46,976 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:28:46,977 INFO L422 BasicCegarLoop]: trace histogram [48, 47, 47, 24, 24, 24, 24, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:28:47,187 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:28:47,188 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:28:47,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:28:47,189 INFO L82 PathProgramCache]: Analyzing trace with hash 1369009677, now seen corresponding path program 23 times [2020-07-20 22:28:47,189 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:28:47,189 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1099259052] [2020-07-20 22:28:47,190 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 22:28:47,291 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:28:47,291 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:28:47,293 INFO L263 TraceCheckSpWp]: Trace formula consists of 531 conjuncts, 55 conjunts are in the unsatisfiable core [2020-07-20 22:28:47,298 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:28:48,767 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:28:49,007 INFO L134 CoverageAnalysis]: Checked inductivity of 5752 backedges. 94 proven. 1334 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2020-07-20 22:28:49,007 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:28:49,103 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:28:49,424 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1099259052] [2020-07-20 22:28:49,424 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:28:49,424 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53] total 53 [2020-07-20 22:28:49,424 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2018630239] [2020-07-20 22:28:49,425 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2020-07-20 22:28:49,425 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:28:49,425 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2020-07-20 22:28:49,425 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=254, Invalid=2826, Unknown=0, NotChecked=0, Total=3080 [2020-07-20 22:28:49,426 INFO L87 Difference]: Start difference. First operand 233 states and 256 transitions. Second operand 53 states. [2020-07-20 22:28:53,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:28:53,416 INFO L93 Difference]: Finished difference Result 245 states and 269 transitions. [2020-07-20 22:28:53,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2020-07-20 22:28:53,417 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 322 [2020-07-20 22:28:53,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:28:53,420 INFO L225 Difference]: With dead ends: 245 [2020-07-20 22:28:53,420 INFO L226 Difference]: Without dead ends: 243 [2020-07-20 22:28:53,421 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 360 GetRequests, 277 SyntacticMatches, 3 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2281 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=482, Invalid=6160, Unknown=0, NotChecked=0, Total=6642 [2020-07-20 22:28:53,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 243 states. [2020-07-20 22:28:53,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 243 to 242. [2020-07-20 22:28:53,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 242 states. [2020-07-20 22:28:53,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 242 states to 242 states and 266 transitions. [2020-07-20 22:28:53,442 INFO L78 Accepts]: Start accepts. Automaton has 242 states and 266 transitions. Word has length 322 [2020-07-20 22:28:53,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:28:53,442 INFO L479 AbstractCegarLoop]: Abstraction has 242 states and 266 transitions. [2020-07-20 22:28:53,442 INFO L480 AbstractCegarLoop]: Interpolant automaton has 53 states. [2020-07-20 22:28:53,442 INFO L276 IsEmpty]: Start isEmpty. Operand 242 states and 266 transitions. [2020-07-20 22:28:53,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 336 [2020-07-20 22:28:53,445 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:28:53,445 INFO L422 BasicCegarLoop]: trace histogram [50, 49, 49, 25, 25, 25, 25, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:28:53,654 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:28:53,655 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:28:53,655 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:28:53,656 INFO L82 PathProgramCache]: Analyzing trace with hash -43136827, now seen corresponding path program 24 times [2020-07-20 22:28:53,656 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:28:53,656 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1523650414] [2020-07-20 22:28:53,657 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 22:28:53,763 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:28:53,763 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:28:53,768 INFO L263 TraceCheckSpWp]: Trace formula consists of 551 conjuncts, 57 conjunts are in the unsatisfiable core [2020-07-20 22:28:53,774 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:28:55,424 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:28:55,664 INFO L134 CoverageAnalysis]: Checked inductivity of 6254 backedges. 98 proven. 1452 refuted. 0 times theorem prover too weak. 4704 trivial. 0 not checked. [2020-07-20 22:28:55,665 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:28:55,767 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:28:56,125 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1523650414] [2020-07-20 22:28:56,125 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:28:56,125 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55] total 55 [2020-07-20 22:28:56,125 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1605996410] [2020-07-20 22:28:56,126 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2020-07-20 22:28:56,126 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:28:56,126 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2020-07-20 22:28:56,127 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=264, Invalid=3042, Unknown=0, NotChecked=0, Total=3306 [2020-07-20 22:28:56,127 INFO L87 Difference]: Start difference. First operand 242 states and 266 transitions. Second operand 55 states. [2020-07-20 22:29:00,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:29:00,348 INFO L93 Difference]: Finished difference Result 254 states and 279 transitions. [2020-07-20 22:29:00,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2020-07-20 22:29:00,350 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 335 [2020-07-20 22:29:00,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:29:00,352 INFO L225 Difference]: With dead ends: 254 [2020-07-20 22:29:00,353 INFO L226 Difference]: Without dead ends: 252 [2020-07-20 22:29:00,354 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 374 GetRequests, 288 SyntacticMatches, 3 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2464 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=501, Invalid=6639, Unknown=0, NotChecked=0, Total=7140 [2020-07-20 22:29:00,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 252 states. [2020-07-20 22:29:00,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 252 to 251. [2020-07-20 22:29:00,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 251 states. [2020-07-20 22:29:00,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 251 states to 251 states and 276 transitions. [2020-07-20 22:29:00,373 INFO L78 Accepts]: Start accepts. Automaton has 251 states and 276 transitions. Word has length 335 [2020-07-20 22:29:00,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:29:00,374 INFO L479 AbstractCegarLoop]: Abstraction has 251 states and 276 transitions. [2020-07-20 22:29:00,374 INFO L480 AbstractCegarLoop]: Interpolant automaton has 55 states. [2020-07-20 22:29:00,374 INFO L276 IsEmpty]: Start isEmpty. Operand 251 states and 276 transitions. [2020-07-20 22:29:00,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 349 [2020-07-20 22:29:00,377 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:29:00,377 INFO L422 BasicCegarLoop]: trace histogram [52, 51, 51, 26, 26, 26, 26, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:29:00,581 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:29:00,582 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:29:00,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:29:00,584 INFO L82 PathProgramCache]: Analyzing trace with hash 2053413133, now seen corresponding path program 25 times [2020-07-20 22:29:00,585 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:29:00,585 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1247084070] [2020-07-20 22:29:00,585 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 22:29:00,686 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:29:00,687 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:29:00,689 INFO L263 TraceCheckSpWp]: Trace formula consists of 571 conjuncts, 59 conjunts are in the unsatisfiable core [2020-07-20 22:29:00,695 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:29:02,462 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:29:02,733 INFO L134 CoverageAnalysis]: Checked inductivity of 6777 backedges. 102 proven. 1575 refuted. 0 times theorem prover too weak. 5100 trivial. 0 not checked. [2020-07-20 22:29:02,733 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:29:02,841 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:29:03,216 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1247084070] [2020-07-20 22:29:03,216 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:29:03,216 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57] total 57 [2020-07-20 22:29:03,216 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1677057443] [2020-07-20 22:29:03,217 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2020-07-20 22:29:03,217 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:29:03,217 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2020-07-20 22:29:03,218 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=274, Invalid=3266, Unknown=0, NotChecked=0, Total=3540 [2020-07-20 22:29:03,218 INFO L87 Difference]: Start difference. First operand 251 states and 276 transitions. Second operand 57 states. [2020-07-20 22:29:07,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:29:07,885 INFO L93 Difference]: Finished difference Result 263 states and 289 transitions. [2020-07-20 22:29:07,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2020-07-20 22:29:07,886 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 348 [2020-07-20 22:29:07,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:29:07,888 INFO L225 Difference]: With dead ends: 263 [2020-07-20 22:29:07,888 INFO L226 Difference]: Without dead ends: 261 [2020-07-20 22:29:07,890 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 388 GetRequests, 299 SyntacticMatches, 3 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2654 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=520, Invalid=7136, Unknown=0, NotChecked=0, Total=7656 [2020-07-20 22:29:07,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2020-07-20 22:29:07,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 260. [2020-07-20 22:29:07,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 260 states. [2020-07-20 22:29:07,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 260 states to 260 states and 286 transitions. [2020-07-20 22:29:07,908 INFO L78 Accepts]: Start accepts. Automaton has 260 states and 286 transitions. Word has length 348 [2020-07-20 22:29:07,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:29:07,908 INFO L479 AbstractCegarLoop]: Abstraction has 260 states and 286 transitions. [2020-07-20 22:29:07,908 INFO L480 AbstractCegarLoop]: Interpolant automaton has 57 states. [2020-07-20 22:29:07,908 INFO L276 IsEmpty]: Start isEmpty. Operand 260 states and 286 transitions. [2020-07-20 22:29:07,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 362 [2020-07-20 22:29:07,910 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:29:07,910 INFO L422 BasicCegarLoop]: trace histogram [54, 53, 53, 27, 27, 27, 27, 26, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:29:08,111 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:29:08,111 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:29:08,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:29:08,112 INFO L82 PathProgramCache]: Analyzing trace with hash -144671291, now seen corresponding path program 26 times [2020-07-20 22:29:08,113 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:29:08,113 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [282161600] [2020-07-20 22:29:08,113 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 22:29:08,222 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:29:08,222 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:29:08,226 INFO L263 TraceCheckSpWp]: Trace formula consists of 594 conjuncts, 61 conjunts are in the unsatisfiable core [2020-07-20 22:29:08,233 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:29:10,105 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:29:10,393 INFO L134 CoverageAnalysis]: Checked inductivity of 7321 backedges. 106 proven. 1703 refuted. 0 times theorem prover too weak. 5512 trivial. 0 not checked. [2020-07-20 22:29:10,394 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:29:10,497 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:29:10,889 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [282161600] [2020-07-20 22:29:10,889 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:29:10,889 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59] total 59 [2020-07-20 22:29:10,890 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [547769266] [2020-07-20 22:29:10,890 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2020-07-20 22:29:10,890 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:29:10,891 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2020-07-20 22:29:10,891 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=284, Invalid=3498, Unknown=0, NotChecked=0, Total=3782 [2020-07-20 22:29:10,891 INFO L87 Difference]: Start difference. First operand 260 states and 286 transitions. Second operand 59 states. [2020-07-20 22:29:15,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:29:15,884 INFO L93 Difference]: Finished difference Result 272 states and 299 transitions. [2020-07-20 22:29:15,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2020-07-20 22:29:15,885 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 361 [2020-07-20 22:29:15,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:29:15,888 INFO L225 Difference]: With dead ends: 272 [2020-07-20 22:29:15,888 INFO L226 Difference]: Without dead ends: 270 [2020-07-20 22:29:15,889 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 402 GetRequests, 310 SyntacticMatches, 3 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2851 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=539, Invalid=7651, Unknown=0, NotChecked=0, Total=8190 [2020-07-20 22:29:15,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 270 states. [2020-07-20 22:29:15,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 270 to 269. [2020-07-20 22:29:15,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 269 states. [2020-07-20 22:29:15,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 269 states to 269 states and 296 transitions. [2020-07-20 22:29:15,911 INFO L78 Accepts]: Start accepts. Automaton has 269 states and 296 transitions. Word has length 361 [2020-07-20 22:29:15,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:29:15,912 INFO L479 AbstractCegarLoop]: Abstraction has 269 states and 296 transitions. [2020-07-20 22:29:15,912 INFO L480 AbstractCegarLoop]: Interpolant automaton has 59 states. [2020-07-20 22:29:15,912 INFO L276 IsEmpty]: Start isEmpty. Operand 269 states and 296 transitions. [2020-07-20 22:29:15,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 375 [2020-07-20 22:29:15,915 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:29:15,915 INFO L422 BasicCegarLoop]: trace histogram [56, 55, 55, 28, 28, 28, 28, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:29:16,128 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:29:16,129 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:29:16,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:29:16,129 INFO L82 PathProgramCache]: Analyzing trace with hash -1992293363, now seen corresponding path program 27 times [2020-07-20 22:29:16,129 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:29:16,129 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1636686793] [2020-07-20 22:29:16,129 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 22:29:16,234 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:29:16,234 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:29:16,237 INFO L263 TraceCheckSpWp]: Trace formula consists of 614 conjuncts, 63 conjunts are in the unsatisfiable core [2020-07-20 22:29:16,241 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:29:18,486 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:29:18,802 INFO L134 CoverageAnalysis]: Checked inductivity of 7886 backedges. 110 proven. 1836 refuted. 0 times theorem prover too weak. 5940 trivial. 0 not checked. [2020-07-20 22:29:18,803 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:29:18,921 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:29:19,335 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1636686793] [2020-07-20 22:29:19,335 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:29:19,336 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61] total 61 [2020-07-20 22:29:19,336 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [294486396] [2020-07-20 22:29:19,337 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2020-07-20 22:29:19,337 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:29:19,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2020-07-20 22:29:19,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=294, Invalid=3738, Unknown=0, NotChecked=0, Total=4032 [2020-07-20 22:29:19,338 INFO L87 Difference]: Start difference. First operand 269 states and 296 transitions. Second operand 61 states. [2020-07-20 22:29:24,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:29:24,970 INFO L93 Difference]: Finished difference Result 281 states and 309 transitions. [2020-07-20 22:29:24,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2020-07-20 22:29:24,972 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 374 [2020-07-20 22:29:24,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:29:24,974 INFO L225 Difference]: With dead ends: 281 [2020-07-20 22:29:24,974 INFO L226 Difference]: Without dead ends: 279 [2020-07-20 22:29:24,977 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 416 GetRequests, 321 SyntacticMatches, 3 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3055 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=558, Invalid=8184, Unknown=0, NotChecked=0, Total=8742 [2020-07-20 22:29:24,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 279 states. [2020-07-20 22:29:24,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 279 to 278. [2020-07-20 22:29:24,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 278 states. [2020-07-20 22:29:24,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 278 states to 278 states and 306 transitions. [2020-07-20 22:29:24,999 INFO L78 Accepts]: Start accepts. Automaton has 278 states and 306 transitions. Word has length 374 [2020-07-20 22:29:25,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:29:25,000 INFO L479 AbstractCegarLoop]: Abstraction has 278 states and 306 transitions. [2020-07-20 22:29:25,000 INFO L480 AbstractCegarLoop]: Interpolant automaton has 61 states. [2020-07-20 22:29:25,000 INFO L276 IsEmpty]: Start isEmpty. Operand 278 states and 306 transitions. [2020-07-20 22:29:25,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 388 [2020-07-20 22:29:25,003 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:29:25,004 INFO L422 BasicCegarLoop]: trace histogram [58, 57, 57, 29, 29, 29, 29, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:29:25,219 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:29:25,219 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:29:25,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:29:25,220 INFO L82 PathProgramCache]: Analyzing trace with hash -676662587, now seen corresponding path program 28 times [2020-07-20 22:29:25,220 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:29:25,220 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [56017801] [2020-07-20 22:29:25,221 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 22:29:25,329 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:29:25,330 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:29:25,332 INFO L263 TraceCheckSpWp]: Trace formula consists of 634 conjuncts, 65 conjunts are in the unsatisfiable core [2020-07-20 22:29:25,337 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:29:27,683 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:29:28,029 INFO L134 CoverageAnalysis]: Checked inductivity of 8472 backedges. 114 proven. 1974 refuted. 0 times theorem prover too weak. 6384 trivial. 0 not checked. [2020-07-20 22:29:28,029 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:29:28,159 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:29:28,609 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [56017801] [2020-07-20 22:29:28,609 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:29:28,609 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63] total 63 [2020-07-20 22:29:28,609 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1426240651] [2020-07-20 22:29:28,611 INFO L459 AbstractCegarLoop]: Interpolant automaton has 63 states [2020-07-20 22:29:28,611 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:29:28,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2020-07-20 22:29:28,611 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=304, Invalid=3986, Unknown=0, NotChecked=0, Total=4290 [2020-07-20 22:29:28,612 INFO L87 Difference]: Start difference. First operand 278 states and 306 transitions. Second operand 63 states. [2020-07-20 22:29:34,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:29:34,621 INFO L93 Difference]: Finished difference Result 290 states and 319 transitions. [2020-07-20 22:29:34,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2020-07-20 22:29:34,622 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 387 [2020-07-20 22:29:34,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:29:34,625 INFO L225 Difference]: With dead ends: 290 [2020-07-20 22:29:34,626 INFO L226 Difference]: Without dead ends: 288 [2020-07-20 22:29:34,627 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 332 SyntacticMatches, 3 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3266 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=577, Invalid=8735, Unknown=0, NotChecked=0, Total=9312 [2020-07-20 22:29:34,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 288 states. [2020-07-20 22:29:34,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 288 to 287. [2020-07-20 22:29:34,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 287 states. [2020-07-20 22:29:34,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 287 states to 287 states and 316 transitions. [2020-07-20 22:29:34,649 INFO L78 Accepts]: Start accepts. Automaton has 287 states and 316 transitions. Word has length 387 [2020-07-20 22:29:34,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:29:34,650 INFO L479 AbstractCegarLoop]: Abstraction has 287 states and 316 transitions. [2020-07-20 22:29:34,650 INFO L480 AbstractCegarLoop]: Interpolant automaton has 63 states. [2020-07-20 22:29:34,650 INFO L276 IsEmpty]: Start isEmpty. Operand 287 states and 316 transitions. [2020-07-20 22:29:34,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 401 [2020-07-20 22:29:34,653 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:29:34,653 INFO L422 BasicCegarLoop]: trace histogram [60, 59, 59, 30, 30, 30, 30, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:29:34,868 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:29:34,869 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:29:34,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:29:34,869 INFO L82 PathProgramCache]: Analyzing trace with hash 1314631437, now seen corresponding path program 29 times [2020-07-20 22:29:34,869 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:29:34,869 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [873623112] [2020-07-20 22:29:34,870 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 22:29:34,977 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:29:34,978 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:29:34,981 INFO L263 TraceCheckSpWp]: Trace formula consists of 654 conjuncts, 67 conjunts are in the unsatisfiable core [2020-07-20 22:29:34,985 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:29:37,564 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:29:37,913 INFO L134 CoverageAnalysis]: Checked inductivity of 9079 backedges. 118 proven. 2117 refuted. 0 times theorem prover too weak. 6844 trivial. 0 not checked. [2020-07-20 22:29:37,913 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:29:38,054 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:29:38,535 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [873623112] [2020-07-20 22:29:38,535 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:29:38,535 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [65] total 65 [2020-07-20 22:29:38,536 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1455205304] [2020-07-20 22:29:38,536 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2020-07-20 22:29:38,536 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:29:38,537 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2020-07-20 22:29:38,537 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=314, Invalid=4242, Unknown=0, NotChecked=0, Total=4556 [2020-07-20 22:29:38,537 INFO L87 Difference]: Start difference. First operand 287 states and 316 transitions. Second operand 65 states. [2020-07-20 22:29:45,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:29:45,191 INFO L93 Difference]: Finished difference Result 299 states and 329 transitions. [2020-07-20 22:29:45,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2020-07-20 22:29:45,193 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 400 [2020-07-20 22:29:45,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:29:45,195 INFO L225 Difference]: With dead ends: 299 [2020-07-20 22:29:45,195 INFO L226 Difference]: Without dead ends: 297 [2020-07-20 22:29:45,196 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 444 GetRequests, 343 SyntacticMatches, 3 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3484 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=596, Invalid=9304, Unknown=0, NotChecked=0, Total=9900 [2020-07-20 22:29:45,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 297 states. [2020-07-20 22:29:45,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 297 to 296. [2020-07-20 22:29:45,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 296 states. [2020-07-20 22:29:45,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 296 states to 296 states and 326 transitions. [2020-07-20 22:29:45,220 INFO L78 Accepts]: Start accepts. Automaton has 296 states and 326 transitions. Word has length 400 [2020-07-20 22:29:45,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:29:45,220 INFO L479 AbstractCegarLoop]: Abstraction has 296 states and 326 transitions. [2020-07-20 22:29:45,220 INFO L480 AbstractCegarLoop]: Interpolant automaton has 65 states. [2020-07-20 22:29:45,221 INFO L276 IsEmpty]: Start isEmpty. Operand 296 states and 326 transitions. [2020-07-20 22:29:45,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 414 [2020-07-20 22:29:45,224 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:29:45,224 INFO L422 BasicCegarLoop]: trace histogram [62, 61, 61, 31, 31, 31, 31, 30, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:29:45,430 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:29:45,431 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:29:45,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:29:45,432 INFO L82 PathProgramCache]: Analyzing trace with hash -1675810875, now seen corresponding path program 30 times [2020-07-20 22:29:45,432 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:29:45,432 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1423049836] [2020-07-20 22:29:45,432 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 22:29:45,544 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:29:45,544 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:29:45,549 INFO L263 TraceCheckSpWp]: Trace formula consists of 677 conjuncts, 69 conjunts are in the unsatisfiable core [2020-07-20 22:29:45,554 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:29:48,309 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:29:48,685 INFO L134 CoverageAnalysis]: Checked inductivity of 9707 backedges. 122 proven. 2265 refuted. 0 times theorem prover too weak. 7320 trivial. 0 not checked. [2020-07-20 22:29:48,686 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:29:48,843 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:29:49,351 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1423049836] [2020-07-20 22:29:49,352 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:29:49,352 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67] total 67 [2020-07-20 22:29:49,353 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1803444792] [2020-07-20 22:29:49,353 INFO L459 AbstractCegarLoop]: Interpolant automaton has 67 states [2020-07-20 22:29:49,353 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:29:49,354 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2020-07-20 22:29:49,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=324, Invalid=4506, Unknown=0, NotChecked=0, Total=4830 [2020-07-20 22:29:49,354 INFO L87 Difference]: Start difference. First operand 296 states and 326 transitions. Second operand 67 states. [2020-07-20 22:29:56,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:29:56,763 INFO L93 Difference]: Finished difference Result 308 states and 339 transitions. [2020-07-20 22:29:56,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2020-07-20 22:29:56,764 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 413 [2020-07-20 22:29:56,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:29:56,767 INFO L225 Difference]: With dead ends: 308 [2020-07-20 22:29:56,767 INFO L226 Difference]: Without dead ends: 306 [2020-07-20 22:29:56,768 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 458 GetRequests, 354 SyntacticMatches, 3 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3709 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=615, Invalid=9891, Unknown=0, NotChecked=0, Total=10506 [2020-07-20 22:29:56,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 306 states. [2020-07-20 22:29:56,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 306 to 305. [2020-07-20 22:29:56,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 305 states. [2020-07-20 22:29:56,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 305 states to 305 states and 336 transitions. [2020-07-20 22:29:56,793 INFO L78 Accepts]: Start accepts. Automaton has 305 states and 336 transitions. Word has length 413 [2020-07-20 22:29:56,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:29:56,794 INFO L479 AbstractCegarLoop]: Abstraction has 305 states and 336 transitions. [2020-07-20 22:29:56,794 INFO L480 AbstractCegarLoop]: Interpolant automaton has 67 states. [2020-07-20 22:29:56,794 INFO L276 IsEmpty]: Start isEmpty. Operand 305 states and 336 transitions. [2020-07-20 22:29:56,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 427 [2020-07-20 22:29:56,797 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:29:56,797 INFO L422 BasicCegarLoop]: trace histogram [64, 63, 63, 32, 32, 32, 32, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:29:57,012 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:29:57,013 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:29:57,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:29:57,014 INFO L82 PathProgramCache]: Analyzing trace with hash -1108895219, now seen corresponding path program 31 times [2020-07-20 22:29:57,014 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:29:57,014 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [81631354] [2020-07-20 22:29:57,014 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 22:29:57,128 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:29:57,129 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:29:57,132 INFO L263 TraceCheckSpWp]: Trace formula consists of 697 conjuncts, 71 conjunts are in the unsatisfiable core [2020-07-20 22:29:57,137 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:30:00,229 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:30:00,634 INFO L134 CoverageAnalysis]: Checked inductivity of 10356 backedges. 126 proven. 2418 refuted. 0 times theorem prover too weak. 7812 trivial. 0 not checked. [2020-07-20 22:30:00,634 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:30:00,833 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:30:01,366 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [81631354] [2020-07-20 22:30:01,366 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:30:01,366 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [69] total 69 [2020-07-20 22:30:01,366 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1050631980] [2020-07-20 22:30:01,367 INFO L459 AbstractCegarLoop]: Interpolant automaton has 69 states [2020-07-20 22:30:01,367 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:30:01,367 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2020-07-20 22:30:01,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=334, Invalid=4778, Unknown=0, NotChecked=0, Total=5112 [2020-07-20 22:30:01,368 INFO L87 Difference]: Start difference. First operand 305 states and 336 transitions. Second operand 69 states. [2020-07-20 22:30:09,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:30:09,711 INFO L93 Difference]: Finished difference Result 317 states and 349 transitions. [2020-07-20 22:30:09,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2020-07-20 22:30:09,713 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 426 [2020-07-20 22:30:09,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:30:09,715 INFO L225 Difference]: With dead ends: 317 [2020-07-20 22:30:09,715 INFO L226 Difference]: Without dead ends: 315 [2020-07-20 22:30:09,717 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 472 GetRequests, 365 SyntacticMatches, 3 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3941 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=634, Invalid=10496, Unknown=0, NotChecked=0, Total=11130 [2020-07-20 22:30:09,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 315 states. [2020-07-20 22:30:09,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 315 to 314. [2020-07-20 22:30:09,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 314 states. [2020-07-20 22:30:09,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 314 states to 314 states and 346 transitions. [2020-07-20 22:30:09,738 INFO L78 Accepts]: Start accepts. Automaton has 314 states and 346 transitions. Word has length 426 [2020-07-20 22:30:09,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:30:09,739 INFO L479 AbstractCegarLoop]: Abstraction has 314 states and 346 transitions. [2020-07-20 22:30:09,739 INFO L480 AbstractCegarLoop]: Interpolant automaton has 69 states. [2020-07-20 22:30:09,739 INFO L276 IsEmpty]: Start isEmpty. Operand 314 states and 346 transitions. [2020-07-20 22:30:09,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 440 [2020-07-20 22:30:09,742 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:30:09,743 INFO L422 BasicCegarLoop]: trace histogram [66, 65, 65, 33, 33, 33, 33, 32, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:30:09,957 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:30:09,958 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:30:09,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:30:09,958 INFO L82 PathProgramCache]: Analyzing trace with hash -1635312443, now seen corresponding path program 32 times [2020-07-20 22:30:09,958 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:30:09,959 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1475523406] [2020-07-20 22:30:09,959 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 22:30:10,078 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:30:10,078 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:30:10,082 INFO L263 TraceCheckSpWp]: Trace formula consists of 717 conjuncts, 73 conjunts are in the unsatisfiable core [2020-07-20 22:30:10,087 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:30:13,460 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:30:13,893 INFO L134 CoverageAnalysis]: Checked inductivity of 11026 backedges. 130 proven. 2576 refuted. 0 times theorem prover too weak. 8320 trivial. 0 not checked. [2020-07-20 22:30:13,894 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:30:14,073 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:30:14,639 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1475523406] [2020-07-20 22:30:14,639 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:30:14,639 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [71] total 71 [2020-07-20 22:30:14,640 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [272567473] [2020-07-20 22:30:14,640 INFO L459 AbstractCegarLoop]: Interpolant automaton has 71 states [2020-07-20 22:30:14,640 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:30:14,641 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2020-07-20 22:30:14,641 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=344, Invalid=5058, Unknown=0, NotChecked=0, Total=5402 [2020-07-20 22:30:14,641 INFO L87 Difference]: Start difference. First operand 314 states and 346 transitions. Second operand 71 states. [2020-07-20 22:30:23,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:30:23,569 INFO L93 Difference]: Finished difference Result 326 states and 359 transitions. [2020-07-20 22:30:23,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2020-07-20 22:30:23,571 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 439 [2020-07-20 22:30:23,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:30:23,574 INFO L225 Difference]: With dead ends: 326 [2020-07-20 22:30:23,574 INFO L226 Difference]: Without dead ends: 324 [2020-07-20 22:30:23,575 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 486 GetRequests, 376 SyntacticMatches, 3 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4180 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=653, Invalid=11119, Unknown=0, NotChecked=0, Total=11772 [2020-07-20 22:30:23,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 324 states. [2020-07-20 22:30:23,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 324 to 323. [2020-07-20 22:30:23,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 323 states. [2020-07-20 22:30:23,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 323 states to 323 states and 356 transitions. [2020-07-20 22:30:23,602 INFO L78 Accepts]: Start accepts. Automaton has 323 states and 356 transitions. Word has length 439 [2020-07-20 22:30:23,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:30:23,603 INFO L479 AbstractCegarLoop]: Abstraction has 323 states and 356 transitions. [2020-07-20 22:30:23,603 INFO L480 AbstractCegarLoop]: Interpolant automaton has 71 states. [2020-07-20 22:30:23,603 INFO L276 IsEmpty]: Start isEmpty. Operand 323 states and 356 transitions. [2020-07-20 22:30:23,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 453 [2020-07-20 22:30:23,606 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:30:23,607 INFO L422 BasicCegarLoop]: trace histogram [68, 67, 67, 34, 34, 34, 34, 33, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:30:23,811 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:30:23,812 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:30:23,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:30:23,813 INFO L82 PathProgramCache]: Analyzing trace with hash -267139827, now seen corresponding path program 33 times [2020-07-20 22:30:23,813 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:30:23,813 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [515004872] [2020-07-20 22:30:23,814 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 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:30:23,934 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:30:23,934 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:30:23,939 INFO L263 TraceCheckSpWp]: Trace formula consists of 737 conjuncts, 75 conjunts are in the unsatisfiable core [2020-07-20 22:30:23,943 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:30:27,577 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:30:28,031 INFO L134 CoverageAnalysis]: Checked inductivity of 11717 backedges. 134 proven. 2739 refuted. 0 times theorem prover too weak. 8844 trivial. 0 not checked. [2020-07-20 22:30:28,031 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:30:28,220 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:30:28,796 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [515004872] [2020-07-20 22:30:28,796 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:30:28,797 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [73] total 73 [2020-07-20 22:30:28,797 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1295571679] [2020-07-20 22:30:28,797 INFO L459 AbstractCegarLoop]: Interpolant automaton has 73 states [2020-07-20 22:30:28,797 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:30:28,798 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2020-07-20 22:30:28,798 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=354, Invalid=5346, Unknown=0, NotChecked=0, Total=5700 [2020-07-20 22:30:28,798 INFO L87 Difference]: Start difference. First operand 323 states and 356 transitions. Second operand 73 states. [2020-07-20 22:30:38,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:30:38,729 INFO L93 Difference]: Finished difference Result 335 states and 369 transitions. [2020-07-20 22:30:38,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2020-07-20 22:30:38,732 INFO L78 Accepts]: Start accepts. Automaton has 73 states. Word has length 452 [2020-07-20 22:30:38,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:30:38,735 INFO L225 Difference]: With dead ends: 335 [2020-07-20 22:30:38,735 INFO L226 Difference]: Without dead ends: 333 [2020-07-20 22:30:38,736 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 500 GetRequests, 387 SyntacticMatches, 3 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4426 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=672, Invalid=11760, Unknown=0, NotChecked=0, Total=12432 [2020-07-20 22:30:38,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 333 states. [2020-07-20 22:30:38,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 333 to 332. [2020-07-20 22:30:38,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 332 states. [2020-07-20 22:30:38,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 332 states to 332 states and 366 transitions. [2020-07-20 22:30:38,764 INFO L78 Accepts]: Start accepts. Automaton has 332 states and 366 transitions. Word has length 452 [2020-07-20 22:30:38,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:30:38,764 INFO L479 AbstractCegarLoop]: Abstraction has 332 states and 366 transitions. [2020-07-20 22:30:38,765 INFO L480 AbstractCegarLoop]: Interpolant automaton has 73 states. [2020-07-20 22:30:38,765 INFO L276 IsEmpty]: Start isEmpty. Operand 332 states and 366 transitions. [2020-07-20 22:30:38,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 466 [2020-07-20 22:30:38,768 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:30:38,768 INFO L422 BasicCegarLoop]: trace histogram [70, 69, 69, 35, 35, 35, 35, 34, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:30:38,982 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:30:38,983 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:30:38,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:30:38,984 INFO L82 PathProgramCache]: Analyzing trace with hash -1799827003, now seen corresponding path program 34 times [2020-07-20 22:30:38,984 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:30:38,984 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1059126991] [2020-07-20 22:30:38,985 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 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:30:39,108 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:30:39,109 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:30:39,112 INFO L263 TraceCheckSpWp]: Trace formula consists of 760 conjuncts, 77 conjunts are in the unsatisfiable core [2020-07-20 22:30:39,118 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:30:43,108 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:30:43,601 INFO L134 CoverageAnalysis]: Checked inductivity of 12429 backedges. 138 proven. 2907 refuted. 0 times theorem prover too weak. 9384 trivial. 0 not checked. [2020-07-20 22:30:43,601 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:30:43,803 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:30:44,444 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1059126991] [2020-07-20 22:30:44,444 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:30:44,444 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [75] total 75 [2020-07-20 22:30:44,445 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1137523322] [2020-07-20 22:30:44,446 INFO L459 AbstractCegarLoop]: Interpolant automaton has 75 states [2020-07-20 22:30:44,446 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:30:44,446 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2020-07-20 22:30:44,447 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=364, Invalid=5642, Unknown=0, NotChecked=0, Total=6006 [2020-07-20 22:30:44,447 INFO L87 Difference]: Start difference. First operand 332 states and 366 transitions. Second operand 75 states. [2020-07-20 22:30:55,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:30:55,951 INFO L93 Difference]: Finished difference Result 344 states and 379 transitions. [2020-07-20 22:30:55,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 109 states. [2020-07-20 22:30:55,953 INFO L78 Accepts]: Start accepts. Automaton has 75 states. Word has length 465 [2020-07-20 22:30:55,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:30:55,956 INFO L225 Difference]: With dead ends: 344 [2020-07-20 22:30:55,956 INFO L226 Difference]: Without dead ends: 342 [2020-07-20 22:30:55,957 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 514 GetRequests, 398 SyntacticMatches, 3 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4679 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=691, Invalid=12419, Unknown=0, NotChecked=0, Total=13110 [2020-07-20 22:30:55,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 342 states. [2020-07-20 22:30:55,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 342 to 341. [2020-07-20 22:30:55,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 341 states. [2020-07-20 22:30:55,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 341 states to 341 states and 376 transitions. [2020-07-20 22:30:55,986 INFO L78 Accepts]: Start accepts. Automaton has 341 states and 376 transitions. Word has length 465 [2020-07-20 22:30:55,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:30:55,986 INFO L479 AbstractCegarLoop]: Abstraction has 341 states and 376 transitions. [2020-07-20 22:30:55,986 INFO L480 AbstractCegarLoop]: Interpolant automaton has 75 states. [2020-07-20 22:30:55,987 INFO L276 IsEmpty]: Start isEmpty. Operand 341 states and 376 transitions. [2020-07-20 22:30:55,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 479 [2020-07-20 22:30:56,000 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:30:56,000 INFO L422 BasicCegarLoop]: trace histogram [72, 71, 71, 36, 36, 36, 36, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:30:56,205 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:30:56,206 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:30:56,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:30:56,207 INFO L82 PathProgramCache]: Analyzing trace with hash 554709005, now seen corresponding path program 35 times [2020-07-20 22:30:56,207 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:30:56,207 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1437728913] [2020-07-20 22:30:56,207 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 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:30:56,332 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:30:56,332 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:30:56,337 INFO L263 TraceCheckSpWp]: Trace formula consists of 780 conjuncts, 79 conjunts are in the unsatisfiable core [2020-07-20 22:30:56,341 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:31:00,801 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:31:01,315 INFO L134 CoverageAnalysis]: Checked inductivity of 13162 backedges. 142 proven. 3080 refuted. 0 times theorem prover too weak. 9940 trivial. 0 not checked. [2020-07-20 22:31:01,315 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:31:01,526 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:31:02,212 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1437728913] [2020-07-20 22:31:02,212 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:31:02,212 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [77] total 77 [2020-07-20 22:31:02,212 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1286592935] [2020-07-20 22:31:02,213 INFO L459 AbstractCegarLoop]: Interpolant automaton has 77 states [2020-07-20 22:31:02,214 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:31:02,214 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2020-07-20 22:31:02,214 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=374, Invalid=5946, Unknown=0, NotChecked=0, Total=6320 [2020-07-20 22:31:02,215 INFO L87 Difference]: Start difference. First operand 341 states and 376 transitions. Second operand 77 states. [2020-07-20 22:31:15,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:31:15,303 INFO L93 Difference]: Finished difference Result 353 states and 389 transitions. [2020-07-20 22:31:15,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 112 states. [2020-07-20 22:31:15,305 INFO L78 Accepts]: Start accepts. Automaton has 77 states. Word has length 478 [2020-07-20 22:31:15,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:31:15,307 INFO L225 Difference]: With dead ends: 353 [2020-07-20 22:31:15,307 INFO L226 Difference]: Without dead ends: 351 [2020-07-20 22:31:15,308 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 528 GetRequests, 409 SyntacticMatches, 3 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4939 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=710, Invalid=13096, Unknown=0, NotChecked=0, Total=13806 [2020-07-20 22:31:15,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 351 states. [2020-07-20 22:31:15,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 351 to 350. [2020-07-20 22:31:15,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 350 states. [2020-07-20 22:31:15,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 350 states to 350 states and 386 transitions. [2020-07-20 22:31:15,337 INFO L78 Accepts]: Start accepts. Automaton has 350 states and 386 transitions. Word has length 478 [2020-07-20 22:31:15,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:31:15,338 INFO L479 AbstractCegarLoop]: Abstraction has 350 states and 386 transitions. [2020-07-20 22:31:15,338 INFO L480 AbstractCegarLoop]: Interpolant automaton has 77 states. [2020-07-20 22:31:15,338 INFO L276 IsEmpty]: Start isEmpty. Operand 350 states and 386 transitions. [2020-07-20 22:31:15,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 492 [2020-07-20 22:31:15,342 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:31:15,342 INFO L422 BasicCegarLoop]: trace histogram [74, 73, 73, 37, 37, 37, 37, 36, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:31:15,548 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:31:15,549 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:31:15,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:31:15,550 INFO L82 PathProgramCache]: Analyzing trace with hash -1870510395, now seen corresponding path program 36 times [2020-07-20 22:31:15,550 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:31:15,550 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [224064203] [2020-07-20 22:31:15,550 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 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:31:15,679 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:31:15,679 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:31:15,684 INFO L263 TraceCheckSpWp]: Trace formula consists of 800 conjuncts, 81 conjunts are in the unsatisfiable core [2020-07-20 22:31:15,688 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:31:20,629 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:31:21,174 INFO L134 CoverageAnalysis]: Checked inductivity of 13916 backedges. 146 proven. 3258 refuted. 0 times theorem prover too weak. 10512 trivial. 0 not checked. [2020-07-20 22:31:21,174 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:31:21,404 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:31:22,147 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [224064203] [2020-07-20 22:31:22,148 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:31:22,148 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [79] total 79 [2020-07-20 22:31:22,148 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1754079362] [2020-07-20 22:31:22,149 INFO L459 AbstractCegarLoop]: Interpolant automaton has 79 states [2020-07-20 22:31:22,149 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:31:22,150 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2020-07-20 22:31:22,150 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=6258, Unknown=0, NotChecked=0, Total=6642 [2020-07-20 22:31:22,150 INFO L87 Difference]: Start difference. First operand 350 states and 386 transitions. Second operand 79 states. [2020-07-20 22:31:36,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:31:36,791 INFO L93 Difference]: Finished difference Result 362 states and 399 transitions. [2020-07-20 22:31:36,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 115 states. [2020-07-20 22:31:36,793 INFO L78 Accepts]: Start accepts. Automaton has 79 states. Word has length 491 [2020-07-20 22:31:36,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:31:36,795 INFO L225 Difference]: With dead ends: 362 [2020-07-20 22:31:36,795 INFO L226 Difference]: Without dead ends: 360 [2020-07-20 22:31:36,796 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 542 GetRequests, 420 SyntacticMatches, 3 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5206 ImplicationChecksByTransitivity, 9.0s TimeCoverageRelationStatistics Valid=729, Invalid=13791, Unknown=0, NotChecked=0, Total=14520 [2020-07-20 22:31:36,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 360 states. [2020-07-20 22:31:36,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 360 to 359. [2020-07-20 22:31:36,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 359 states. [2020-07-20 22:31:36,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 359 states to 359 states and 396 transitions. [2020-07-20 22:31:36,826 INFO L78 Accepts]: Start accepts. Automaton has 359 states and 396 transitions. Word has length 491 [2020-07-20 22:31:36,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:31:36,827 INFO L479 AbstractCegarLoop]: Abstraction has 359 states and 396 transitions. [2020-07-20 22:31:36,827 INFO L480 AbstractCegarLoop]: Interpolant automaton has 79 states. [2020-07-20 22:31:36,827 INFO L276 IsEmpty]: Start isEmpty. Operand 359 states and 396 transitions. [2020-07-20 22:31:36,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 505 [2020-07-20 22:31:36,831 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:31:36,831 INFO L422 BasicCegarLoop]: trace histogram [76, 75, 75, 38, 38, 38, 38, 37, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:31:37,044 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:31:37,045 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:31:37,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:31:37,046 INFO L82 PathProgramCache]: Analyzing trace with hash -1324557555, now seen corresponding path program 37 times [2020-07-20 22:31:37,046 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:31:37,046 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [227868395] [2020-07-20 22:31:37,047 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 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:31:37,183 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:31:37,183 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:31:37,187 INFO L263 TraceCheckSpWp]: Trace formula consists of 820 conjuncts, 83 conjunts are in the unsatisfiable core [2020-07-20 22:31:37,208 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:31:42,639 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:31:43,232 INFO L134 CoverageAnalysis]: Checked inductivity of 14691 backedges. 150 proven. 3441 refuted. 0 times theorem prover too weak. 11100 trivial. 0 not checked. [2020-07-20 22:31:43,232 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:31:43,490 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:31:44,295 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [227868395] [2020-07-20 22:31:44,295 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:31:44,295 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [81] total 81 [2020-07-20 22:31:44,295 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [842377822] [2020-07-20 22:31:44,296 INFO L459 AbstractCegarLoop]: Interpolant automaton has 81 states [2020-07-20 22:31:44,296 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:31:44,296 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2020-07-20 22:31:44,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=394, Invalid=6578, Unknown=0, NotChecked=0, Total=6972 [2020-07-20 22:31:44,297 INFO L87 Difference]: Start difference. First operand 359 states and 396 transitions. Second operand 81 states. [2020-07-20 22:32:01,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:32:01,061 INFO L93 Difference]: Finished difference Result 371 states and 409 transitions. [2020-07-20 22:32:01,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 118 states. [2020-07-20 22:32:01,064 INFO L78 Accepts]: Start accepts. Automaton has 81 states. Word has length 504 [2020-07-20 22:32:01,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:32:01,067 INFO L225 Difference]: With dead ends: 371 [2020-07-20 22:32:01,067 INFO L226 Difference]: Without dead ends: 369 [2020-07-20 22:32:01,068 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 556 GetRequests, 431 SyntacticMatches, 3 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5480 ImplicationChecksByTransitivity, 9.9s TimeCoverageRelationStatistics Valid=748, Invalid=14504, Unknown=0, NotChecked=0, Total=15252 [2020-07-20 22:32:01,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 369 states. [2020-07-20 22:32:01,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 369 to 368. [2020-07-20 22:32:01,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 368 states. [2020-07-20 22:32:01,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 368 states to 368 states and 406 transitions. [2020-07-20 22:32:01,099 INFO L78 Accepts]: Start accepts. Automaton has 368 states and 406 transitions. Word has length 504 [2020-07-20 22:32:01,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:32:01,100 INFO L479 AbstractCegarLoop]: Abstraction has 368 states and 406 transitions. [2020-07-20 22:32:01,100 INFO L480 AbstractCegarLoop]: Interpolant automaton has 81 states. [2020-07-20 22:32:01,100 INFO L276 IsEmpty]: Start isEmpty. Operand 368 states and 406 transitions. [2020-07-20 22:32:01,104 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 518 [2020-07-20 22:32:01,104 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:32:01,104 INFO L422 BasicCegarLoop]: trace histogram [78, 77, 77, 39, 39, 39, 39, 38, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:32:01,319 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:32:01,320 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:32:01,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:32:01,320 INFO L82 PathProgramCache]: Analyzing trace with hash -5014587, now seen corresponding path program 38 times [2020-07-20 22:32:01,321 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:32:01,321 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1181190937] [2020-07-20 22:32:01,321 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 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:32:01,455 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:32:01,456 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:32:01,461 INFO L263 TraceCheckSpWp]: Trace formula consists of 843 conjuncts, 85 conjunts are in the unsatisfiable core [2020-07-20 22:32:01,465 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:32:07,335 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:32:07,975 INFO L134 CoverageAnalysis]: Checked inductivity of 15487 backedges. 154 proven. 3629 refuted. 0 times theorem prover too weak. 11704 trivial. 0 not checked. [2020-07-20 22:32:07,975 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:32:08,258 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:32:09,133 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1181190937] [2020-07-20 22:32:09,133 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:32:09,133 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [83] total 83 [2020-07-20 22:32:09,134 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1807377165] [2020-07-20 22:32:09,134 INFO L459 AbstractCegarLoop]: Interpolant automaton has 83 states [2020-07-20 22:32:09,134 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:32:09,134 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2020-07-20 22:32:09,135 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=404, Invalid=6906, Unknown=0, NotChecked=0, Total=7310 [2020-07-20 22:32:09,135 INFO L87 Difference]: Start difference. First operand 368 states and 406 transitions. Second operand 83 states. [2020-07-20 22:32:27,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:32:27,394 INFO L93 Difference]: Finished difference Result 380 states and 419 transitions. [2020-07-20 22:32:27,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 121 states. [2020-07-20 22:32:27,396 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 517 [2020-07-20 22:32:27,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:32:27,399 INFO L225 Difference]: With dead ends: 380 [2020-07-20 22:32:27,399 INFO L226 Difference]: Without dead ends: 378 [2020-07-20 22:32:27,401 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 570 GetRequests, 442 SyntacticMatches, 3 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5761 ImplicationChecksByTransitivity, 10.8s TimeCoverageRelationStatistics Valid=767, Invalid=15235, Unknown=0, NotChecked=0, Total=16002 [2020-07-20 22:32:27,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 378 states. [2020-07-20 22:32:27,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 378 to 377. [2020-07-20 22:32:27,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 377 states. [2020-07-20 22:32:27,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 377 states to 377 states and 416 transitions. [2020-07-20 22:32:27,424 INFO L78 Accepts]: Start accepts. Automaton has 377 states and 416 transitions. Word has length 517 [2020-07-20 22:32:27,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:32:27,425 INFO L479 AbstractCegarLoop]: Abstraction has 377 states and 416 transitions. [2020-07-20 22:32:27,425 INFO L480 AbstractCegarLoop]: Interpolant automaton has 83 states. [2020-07-20 22:32:27,426 INFO L276 IsEmpty]: Start isEmpty. Operand 377 states and 416 transitions. [2020-07-20 22:32:27,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 531 [2020-07-20 22:32:27,429 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:32:27,429 INFO L422 BasicCegarLoop]: trace histogram [80, 79, 79, 40, 40, 40, 40, 39, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:32:27,631 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:32:27,631 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:32:27,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:32:27,632 INFO L82 PathProgramCache]: Analyzing trace with hash 607766029, now seen corresponding path program 39 times [2020-07-20 22:32:27,632 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:32:27,632 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [652396384] [2020-07-20 22:32:27,633 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 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:32:27,773 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:32:27,773 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:32:27,777 INFO L263 TraceCheckSpWp]: Trace formula consists of 863 conjuncts, 87 conjunts are in the unsatisfiable core [2020-07-20 22:32:27,781 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:32:34,170 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:32:34,823 INFO L134 CoverageAnalysis]: Checked inductivity of 16304 backedges. 158 proven. 3822 refuted. 0 times theorem prover too weak. 12324 trivial. 0 not checked. [2020-07-20 22:32:34,823 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:32:35,136 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:32:36,057 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [652396384] [2020-07-20 22:32:36,057 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:32:36,057 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [85] total 85 [2020-07-20 22:32:36,058 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [726938308] [2020-07-20 22:32:36,058 INFO L459 AbstractCegarLoop]: Interpolant automaton has 85 states [2020-07-20 22:32:36,059 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:32:36,059 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2020-07-20 22:32:36,060 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=414, Invalid=7242, Unknown=0, NotChecked=0, Total=7656 [2020-07-20 22:32:36,060 INFO L87 Difference]: Start difference. First operand 377 states and 416 transitions. Second operand 85 states. [2020-07-20 22:32:58,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:32:58,087 INFO L93 Difference]: Finished difference Result 389 states and 429 transitions. [2020-07-20 22:32:58,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 124 states. [2020-07-20 22:32:58,090 INFO L78 Accepts]: Start accepts. Automaton has 85 states. Word has length 530 [2020-07-20 22:32:58,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:32:58,093 INFO L225 Difference]: With dead ends: 389 [2020-07-20 22:32:58,094 INFO L226 Difference]: Without dead ends: 387 [2020-07-20 22:32:58,095 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 584 GetRequests, 453 SyntacticMatches, 3 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6049 ImplicationChecksByTransitivity, 12.0s TimeCoverageRelationStatistics Valid=786, Invalid=15984, Unknown=0, NotChecked=0, Total=16770 [2020-07-20 22:32:58,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 387 states. [2020-07-20 22:32:58,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 387 to 386. [2020-07-20 22:32:58,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 386 states. [2020-07-20 22:32:58,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 386 states to 386 states and 426 transitions. [2020-07-20 22:32:58,128 INFO L78 Accepts]: Start accepts. Automaton has 386 states and 426 transitions. Word has length 530 [2020-07-20 22:32:58,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:32:58,129 INFO L479 AbstractCegarLoop]: Abstraction has 386 states and 426 transitions. [2020-07-20 22:32:58,129 INFO L480 AbstractCegarLoop]: Interpolant automaton has 85 states. [2020-07-20 22:32:58,129 INFO L276 IsEmpty]: Start isEmpty. Operand 386 states and 426 transitions. [2020-07-20 22:32:58,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 544 [2020-07-20 22:32:58,133 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:32:58,133 INFO L422 BasicCegarLoop]: trace histogram [82, 81, 81, 41, 41, 41, 41, 40, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:32:58,334 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:32:58,334 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:32:58,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:32:58,335 INFO L82 PathProgramCache]: Analyzing trace with hash -1407422267, now seen corresponding path program 40 times [2020-07-20 22:32:58,336 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:32:58,336 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [376591319] [2020-07-20 22:32:58,336 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 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:32:58,477 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:32:58,477 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:32:58,482 INFO L263 TraceCheckSpWp]: Trace formula consists of 883 conjuncts, 89 conjunts are in the unsatisfiable core [2020-07-20 22:32:58,487 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:33:05,465 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:33:06,190 INFO L134 CoverageAnalysis]: Checked inductivity of 17142 backedges. 162 proven. 4020 refuted. 0 times theorem prover too weak. 12960 trivial. 0 not checked. [2020-07-20 22:33:06,190 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:33:06,499 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:33:07,490 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [376591319] [2020-07-20 22:33:07,490 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:33:07,490 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [87] total 87 [2020-07-20 22:33:07,491 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1088563246] [2020-07-20 22:33:07,491 INFO L459 AbstractCegarLoop]: Interpolant automaton has 87 states [2020-07-20 22:33:07,492 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:33:07,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2020-07-20 22:33:07,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=424, Invalid=7586, Unknown=0, NotChecked=0, Total=8010 [2020-07-20 22:33:07,493 INFO L87 Difference]: Start difference. First operand 386 states and 426 transitions. Second operand 87 states. [2020-07-20 22:33:30,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:33:30,026 INFO L93 Difference]: Finished difference Result 398 states and 439 transitions. [2020-07-20 22:33:30,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 127 states. [2020-07-20 22:33:30,029 INFO L78 Accepts]: Start accepts. Automaton has 87 states. Word has length 543 [2020-07-20 22:33:30,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:33:30,032 INFO L225 Difference]: With dead ends: 398 [2020-07-20 22:33:30,032 INFO L226 Difference]: Without dead ends: 396 [2020-07-20 22:33:30,033 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 598 GetRequests, 464 SyntacticMatches, 3 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6344 ImplicationChecksByTransitivity, 12.7s TimeCoverageRelationStatistics Valid=805, Invalid=16751, Unknown=0, NotChecked=0, Total=17556 [2020-07-20 22:33:30,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 396 states. [2020-07-20 22:33:30,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 396 to 395. [2020-07-20 22:33:30,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 395 states. [2020-07-20 22:33:30,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 395 states to 395 states and 436 transitions. [2020-07-20 22:33:30,059 INFO L78 Accepts]: Start accepts. Automaton has 395 states and 436 transitions. Word has length 543 [2020-07-20 22:33:30,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:33:30,060 INFO L479 AbstractCegarLoop]: Abstraction has 395 states and 436 transitions. [2020-07-20 22:33:30,060 INFO L480 AbstractCegarLoop]: Interpolant automaton has 87 states. [2020-07-20 22:33:30,060 INFO L276 IsEmpty]: Start isEmpty. Operand 395 states and 436 transitions. [2020-07-20 22:33:30,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 557 [2020-07-20 22:33:30,064 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:33:30,064 INFO L422 BasicCegarLoop]: trace histogram [84, 83, 83, 42, 42, 42, 42, 41, 41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:33:30,278 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:33:30,279 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:33:30,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:33:30,280 INFO L82 PathProgramCache]: Analyzing trace with hash 583463181, now seen corresponding path program 41 times [2020-07-20 22:33:30,280 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:33:30,280 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1979258501] [2020-07-20 22:33:30,281 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 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:33:30,425 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:33:30,425 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:33:30,429 INFO L263 TraceCheckSpWp]: Trace formula consists of 903 conjuncts, 91 conjunts are in the unsatisfiable core [2020-07-20 22:33:30,435 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:33:37,831 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:33:38,591 INFO L134 CoverageAnalysis]: Checked inductivity of 18001 backedges. 166 proven. 4223 refuted. 0 times theorem prover too weak. 13612 trivial. 0 not checked. [2020-07-20 22:33:38,591 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:33:38,936 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:33:39,977 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1979258501] [2020-07-20 22:33:39,977 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:33:39,977 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [89] total 89 [2020-07-20 22:33:39,977 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1269796207] [2020-07-20 22:33:39,978 INFO L459 AbstractCegarLoop]: Interpolant automaton has 89 states [2020-07-20 22:33:39,978 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:33:39,978 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2020-07-20 22:33:39,979 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=434, Invalid=7938, Unknown=0, NotChecked=0, Total=8372 [2020-07-20 22:33:39,979 INFO L87 Difference]: Start difference. First operand 395 states and 436 transitions. Second operand 89 states. [2020-07-20 22:34:04,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:34:04,912 INFO L93 Difference]: Finished difference Result 407 states and 449 transitions. [2020-07-20 22:34:04,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 130 states. [2020-07-20 22:34:04,915 INFO L78 Accepts]: Start accepts. Automaton has 89 states. Word has length 556 [2020-07-20 22:34:04,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:34:04,919 INFO L225 Difference]: With dead ends: 407 [2020-07-20 22:34:04,919 INFO L226 Difference]: Without dead ends: 405 [2020-07-20 22:34:04,920 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 612 GetRequests, 475 SyntacticMatches, 3 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6646 ImplicationChecksByTransitivity, 13.6s TimeCoverageRelationStatistics Valid=824, Invalid=17536, Unknown=0, NotChecked=0, Total=18360 [2020-07-20 22:34:04,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 405 states. [2020-07-20 22:34:04,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 405 to 404. [2020-07-20 22:34:04,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 404 states. [2020-07-20 22:34:04,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 404 states to 404 states and 446 transitions. [2020-07-20 22:34:04,950 INFO L78 Accepts]: Start accepts. Automaton has 404 states and 446 transitions. Word has length 556 [2020-07-20 22:34:04,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:34:04,950 INFO L479 AbstractCegarLoop]: Abstraction has 404 states and 446 transitions. [2020-07-20 22:34:04,950 INFO L480 AbstractCegarLoop]: Interpolant automaton has 89 states. [2020-07-20 22:34:04,951 INFO L276 IsEmpty]: Start isEmpty. Operand 404 states and 446 transitions. [2020-07-20 22:34:04,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 570 [2020-07-20 22:34:04,954 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:34:04,954 INFO L422 BasicCegarLoop]: trace histogram [86, 85, 85, 43, 43, 43, 43, 42, 42, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:34:05,155 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:34:05,155 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:34:05,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:34:05,156 INFO L82 PathProgramCache]: Analyzing trace with hash -1148377659, now seen corresponding path program 42 times [2020-07-20 22:34:05,156 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:34:05,157 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1628637818] [2020-07-20 22:34:05,157 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 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:34:05,306 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:34:05,306 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:34:05,310 INFO L263 TraceCheckSpWp]: Trace formula consists of 926 conjuncts, 93 conjunts are in the unsatisfiable core [2020-07-20 22:34:05,315 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:34:13,514 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:34:14,327 INFO L134 CoverageAnalysis]: Checked inductivity of 18881 backedges. 170 proven. 4431 refuted. 0 times theorem prover too weak. 14280 trivial. 0 not checked. [2020-07-20 22:34:14,327 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:34:14,702 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:34:15,834 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1628637818] [2020-07-20 22:34:15,834 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:34:15,834 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [91] total 91 [2020-07-20 22:34:15,835 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [415920636] [2020-07-20 22:34:15,835 INFO L459 AbstractCegarLoop]: Interpolant automaton has 91 states [2020-07-20 22:34:15,835 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:34:15,835 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2020-07-20 22:34:15,836 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=444, Invalid=8298, Unknown=0, NotChecked=0, Total=8742 [2020-07-20 22:34:15,836 INFO L87 Difference]: Start difference. First operand 404 states and 446 transitions. Second operand 91 states. [2020-07-20 22:34:43,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:34:43,916 INFO L93 Difference]: Finished difference Result 416 states and 459 transitions. [2020-07-20 22:34:43,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 133 states. [2020-07-20 22:34:43,920 INFO L78 Accepts]: Start accepts. Automaton has 91 states. Word has length 569 [2020-07-20 22:34:43,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:34:43,923 INFO L225 Difference]: With dead ends: 416 [2020-07-20 22:34:43,924 INFO L226 Difference]: Without dead ends: 414 [2020-07-20 22:34:43,925 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 626 GetRequests, 486 SyntacticMatches, 3 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6955 ImplicationChecksByTransitivity, 15.0s TimeCoverageRelationStatistics Valid=843, Invalid=18339, Unknown=0, NotChecked=0, Total=19182 [2020-07-20 22:34:43,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 414 states. [2020-07-20 22:34:43,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 414 to 413. [2020-07-20 22:34:43,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 413 states. [2020-07-20 22:34:43,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 413 states to 413 states and 456 transitions. [2020-07-20 22:34:43,954 INFO L78 Accepts]: Start accepts. Automaton has 413 states and 456 transitions. Word has length 569 [2020-07-20 22:34:43,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:34:43,954 INFO L479 AbstractCegarLoop]: Abstraction has 413 states and 456 transitions. [2020-07-20 22:34:43,954 INFO L480 AbstractCegarLoop]: Interpolant automaton has 91 states. [2020-07-20 22:34:43,954 INFO L276 IsEmpty]: Start isEmpty. Operand 413 states and 456 transitions. [2020-07-20 22:34:43,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 583 [2020-07-20 22:34:43,957 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:34:43,958 INFO L422 BasicCegarLoop]: trace histogram [88, 87, 87, 44, 44, 44, 44, 43, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:34:44,158 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:34:44,158 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:34:44,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:34:44,159 INFO L82 PathProgramCache]: Analyzing trace with hash 2028231693, now seen corresponding path program 43 times [2020-07-20 22:34:44,160 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:34:44,160 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2015475004] [2020-07-20 22:34:44,160 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 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:34:44,314 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:34:44,314 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:34:44,318 INFO L263 TraceCheckSpWp]: Trace formula consists of 946 conjuncts, 95 conjunts are in the unsatisfiable core [2020-07-20 22:34:44,323 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:34:53,277 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:34:54,120 INFO L134 CoverageAnalysis]: Checked inductivity of 19782 backedges. 174 proven. 4644 refuted. 0 times theorem prover too weak. 14964 trivial. 0 not checked. [2020-07-20 22:34:54,121 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:34:54,519 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:34:55,753 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2015475004] [2020-07-20 22:34:55,753 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:34:55,753 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [93] total 93 [2020-07-20 22:34:55,753 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1914817251] [2020-07-20 22:34:55,754 INFO L459 AbstractCegarLoop]: Interpolant automaton has 93 states [2020-07-20 22:34:55,755 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:34:55,755 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2020-07-20 22:34:55,755 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=454, Invalid=8666, Unknown=0, NotChecked=0, Total=9120 [2020-07-20 22:34:55,755 INFO L87 Difference]: Start difference. First operand 413 states and 456 transitions. Second operand 93 states. [2020-07-20 22:35:28,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:35:28,162 INFO L93 Difference]: Finished difference Result 425 states and 469 transitions. [2020-07-20 22:35:28,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 136 states. [2020-07-20 22:35:28,165 INFO L78 Accepts]: Start accepts. Automaton has 93 states. Word has length 582 [2020-07-20 22:35:28,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:35:28,168 INFO L225 Difference]: With dead ends: 425 [2020-07-20 22:35:28,169 INFO L226 Difference]: Without dead ends: 423 [2020-07-20 22:35:28,170 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 640 GetRequests, 497 SyntacticMatches, 3 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7271 ImplicationChecksByTransitivity, 16.5s TimeCoverageRelationStatistics Valid=862, Invalid=19160, Unknown=0, NotChecked=0, Total=20022 [2020-07-20 22:35:28,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 423 states. [2020-07-20 22:35:28,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 423 to 422. [2020-07-20 22:35:28,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 422 states. [2020-07-20 22:35:28,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 422 states to 422 states and 466 transitions. [2020-07-20 22:35:28,197 INFO L78 Accepts]: Start accepts. Automaton has 422 states and 466 transitions. Word has length 582 [2020-07-20 22:35:28,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:35:28,198 INFO L479 AbstractCegarLoop]: Abstraction has 422 states and 466 transitions. [2020-07-20 22:35:28,198 INFO L480 AbstractCegarLoop]: Interpolant automaton has 93 states. [2020-07-20 22:35:28,199 INFO L276 IsEmpty]: Start isEmpty. Operand 422 states and 466 transitions. [2020-07-20 22:35:28,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 596 [2020-07-20 22:35:28,203 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:35:28,203 INFO L422 BasicCegarLoop]: trace histogram [90, 89, 89, 45, 45, 45, 45, 44, 44, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:35:28,403 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:35:28,404 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:35:28,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:35:28,405 INFO L82 PathProgramCache]: Analyzing trace with hash -1344955707, now seen corresponding path program 44 times [2020-07-20 22:35:28,405 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:35:28,405 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1998584939] [2020-07-20 22:35:28,405 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 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:35:28,569 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:35:28,569 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:35:28,574 INFO L263 TraceCheckSpWp]: Trace formula consists of 966 conjuncts, 97 conjunts are in the unsatisfiable core [2020-07-20 22:35:28,579 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:35:38,646 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:35:39,570 INFO L134 CoverageAnalysis]: Checked inductivity of 20704 backedges. 178 proven. 4862 refuted. 0 times theorem prover too weak. 15664 trivial. 0 not checked. [2020-07-20 22:35:39,571 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:35:40,016 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:35:41,418 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1998584939] [2020-07-20 22:35:41,419 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:35:41,419 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [95] total 95 [2020-07-20 22:35:41,419 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [481478164] [2020-07-20 22:35:41,420 INFO L459 AbstractCegarLoop]: Interpolant automaton has 95 states [2020-07-20 22:35:41,420 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:35:41,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2020-07-20 22:35:41,421 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=464, Invalid=9042, Unknown=0, NotChecked=0, Total=9506 [2020-07-20 22:35:41,421 INFO L87 Difference]: Start difference. First operand 422 states and 466 transitions. Second operand 95 states. [2020-07-20 22:36:19,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:36:19,545 INFO L93 Difference]: Finished difference Result 434 states and 479 transitions. [2020-07-20 22:36:19,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 139 states. [2020-07-20 22:36:19,549 INFO L78 Accepts]: Start accepts. Automaton has 95 states. Word has length 595 [2020-07-20 22:36:19,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:36:19,553 INFO L225 Difference]: With dead ends: 434 [2020-07-20 22:36:19,553 INFO L226 Difference]: Without dead ends: 432 [2020-07-20 22:36:19,554 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 654 GetRequests, 508 SyntacticMatches, 3 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7594 ImplicationChecksByTransitivity, 18.5s TimeCoverageRelationStatistics Valid=881, Invalid=19999, Unknown=0, NotChecked=0, Total=20880 [2020-07-20 22:36:19,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 432 states. [2020-07-20 22:36:19,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 432 to 431. [2020-07-20 22:36:19,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 431 states. [2020-07-20 22:36:19,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 431 states to 431 states and 476 transitions. [2020-07-20 22:36:19,596 INFO L78 Accepts]: Start accepts. Automaton has 431 states and 476 transitions. Word has length 595 [2020-07-20 22:36:19,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:36:19,596 INFO L479 AbstractCegarLoop]: Abstraction has 431 states and 476 transitions. [2020-07-20 22:36:19,597 INFO L480 AbstractCegarLoop]: Interpolant automaton has 95 states. [2020-07-20 22:36:19,597 INFO L276 IsEmpty]: Start isEmpty. Operand 431 states and 476 transitions. [2020-07-20 22:36:19,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 609 [2020-07-20 22:36:19,602 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:36:19,602 INFO L422 BasicCegarLoop]: trace histogram [92, 91, 91, 46, 46, 46, 46, 45, 45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:36:19,816 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:36:19,817 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:36:19,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:36:19,817 INFO L82 PathProgramCache]: Analyzing trace with hash 381814541, now seen corresponding path program 45 times [2020-07-20 22:36:19,817 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:36:19,818 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1937007642] [2020-07-20 22:36:19,818 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 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:36:19,977 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:36:19,978 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:36:19,984 INFO L263 TraceCheckSpWp]: Trace formula consists of 986 conjuncts, 99 conjunts are in the unsatisfiable core [2020-07-20 22:36:19,989 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:36:31,638 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:36:32,684 INFO L134 CoverageAnalysis]: Checked inductivity of 21647 backedges. 182 proven. 5085 refuted. 0 times theorem prover too weak. 16380 trivial. 0 not checked. [2020-07-20 22:36:32,685 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:36:33,207 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:36:34,823 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1937007642] [2020-07-20 22:36:34,823 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:36:34,823 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [97] total 97 [2020-07-20 22:36:34,824 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [669129456] [2020-07-20 22:36:34,824 INFO L459 AbstractCegarLoop]: Interpolant automaton has 97 states [2020-07-20 22:36:34,825 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:36:34,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2020-07-20 22:36:34,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=474, Invalid=9426, Unknown=0, NotChecked=0, Total=9900 [2020-07-20 22:36:34,825 INFO L87 Difference]: Start difference. First operand 431 states and 476 transitions. Second operand 97 states. [2020-07-20 22:37:19,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:37:19,918 INFO L93 Difference]: Finished difference Result 443 states and 489 transitions. [2020-07-20 22:37:19,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 142 states. [2020-07-20 22:37:19,923 INFO L78 Accepts]: Start accepts. Automaton has 97 states. Word has length 608 [2020-07-20 22:37:19,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:37:19,927 INFO L225 Difference]: With dead ends: 443 [2020-07-20 22:37:19,927 INFO L226 Difference]: Without dead ends: 441 [2020-07-20 22:37:19,928 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 668 GetRequests, 519 SyntacticMatches, 3 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7924 ImplicationChecksByTransitivity, 21.5s TimeCoverageRelationStatistics Valid=900, Invalid=20856, Unknown=0, NotChecked=0, Total=21756 [2020-07-20 22:37:19,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 441 states. [2020-07-20 22:37:19,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 441 to 440. [2020-07-20 22:37:19,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 440 states. [2020-07-20 22:37:19,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 440 states to 440 states and 486 transitions. [2020-07-20 22:37:19,973 INFO L78 Accepts]: Start accepts. Automaton has 440 states and 486 transitions. Word has length 608 [2020-07-20 22:37:19,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:37:19,974 INFO L479 AbstractCegarLoop]: Abstraction has 440 states and 486 transitions. [2020-07-20 22:37:19,974 INFO L480 AbstractCegarLoop]: Interpolant automaton has 97 states. [2020-07-20 22:37:19,975 INFO L276 IsEmpty]: Start isEmpty. Operand 440 states and 486 transitions. [2020-07-20 22:37:19,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 622 [2020-07-20 22:37:19,980 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:37:19,981 INFO L422 BasicCegarLoop]: trace histogram [94, 93, 93, 47, 47, 47, 47, 46, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:37:20,194 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:37:20,195 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:37:20,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:37:20,196 INFO L82 PathProgramCache]: Analyzing trace with hash 1724239813, now seen corresponding path program 46 times [2020-07-20 22:37:20,196 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:37:20,197 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [224723694] [2020-07-20 22:37:20,197 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 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:37:20,482 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:37:20,482 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:37:20,495 INFO L263 TraceCheckSpWp]: Trace formula consists of 1009 conjuncts, 101 conjunts are in the unsatisfiable core [2020-07-20 22:37:20,507 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:37:34,344 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:37:35,493 INFO L134 CoverageAnalysis]: Checked inductivity of 22611 backedges. 186 proven. 5313 refuted. 0 times theorem prover too weak. 17112 trivial. 0 not checked. [2020-07-20 22:37:35,493 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:37:36,125 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:37:38,011 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [224723694] [2020-07-20 22:37:38,011 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:37:38,012 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [99] total 99 [2020-07-20 22:37:38,012 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [631895470] [2020-07-20 22:37:38,013 INFO L459 AbstractCegarLoop]: Interpolant automaton has 99 states [2020-07-20 22:37:38,013 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:37:38,014 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2020-07-20 22:37:38,014 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=484, Invalid=9818, Unknown=0, NotChecked=0, Total=10302 [2020-07-20 22:37:38,015 INFO L87 Difference]: Start difference. First operand 440 states and 486 transitions. Second operand 99 states. [2020-07-20 22:38:30,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:38:30,397 INFO L93 Difference]: Finished difference Result 452 states and 499 transitions. [2020-07-20 22:38:30,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 145 states. [2020-07-20 22:38:30,403 INFO L78 Accepts]: Start accepts. Automaton has 99 states. Word has length 621 [2020-07-20 22:38:30,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:38:30,406 INFO L225 Difference]: With dead ends: 452 [2020-07-20 22:38:30,406 INFO L226 Difference]: Without dead ends: 450 [2020-07-20 22:38:30,408 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 682 GetRequests, 530 SyntacticMatches, 3 SemanticMatches, 149 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8261 ImplicationChecksByTransitivity, 25.5s TimeCoverageRelationStatistics Valid=919, Invalid=21731, Unknown=0, NotChecked=0, Total=22650 [2020-07-20 22:38:30,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 450 states. [2020-07-20 22:38:30,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 450 to 449. [2020-07-20 22:38:30,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 449 states. [2020-07-20 22:38:30,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 449 states to 449 states and 496 transitions. [2020-07-20 22:38:30,438 INFO L78 Accepts]: Start accepts. Automaton has 449 states and 496 transitions. Word has length 621 [2020-07-20 22:38:30,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:38:30,438 INFO L479 AbstractCegarLoop]: Abstraction has 449 states and 496 transitions. [2020-07-20 22:38:30,439 INFO L480 AbstractCegarLoop]: Interpolant automaton has 99 states. [2020-07-20 22:38:30,439 INFO L276 IsEmpty]: Start isEmpty. Operand 449 states and 496 transitions. [2020-07-20 22:38:30,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 635 [2020-07-20 22:38:30,442 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:38:30,443 INFO L422 BasicCegarLoop]: trace histogram [96, 95, 95, 48, 48, 48, 48, 47, 47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:38:30,643 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:38:30,644 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:38:30,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:38:30,645 INFO L82 PathProgramCache]: Analyzing trace with hash 277869069, now seen corresponding path program 47 times [2020-07-20 22:38:30,645 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:38:30,645 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [395236634] [2020-07-20 22:38:30,646 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 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:38:30,826 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:38:30,827 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:38:30,836 INFO L263 TraceCheckSpWp]: Trace formula consists of 1029 conjuncts, 103 conjunts are in the unsatisfiable core [2020-07-20 22:38:30,845 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:38:46,982 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:38:48,218 INFO L134 CoverageAnalysis]: Checked inductivity of 23596 backedges. 190 proven. 5546 refuted. 0 times theorem prover too weak. 17860 trivial. 0 not checked. [2020-07-20 22:38:48,218 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:38:48,928 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:38:51,061 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [395236634] [2020-07-20 22:38:51,061 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:38:51,061 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [101] total 101 [2020-07-20 22:38:51,062 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [236591219] [2020-07-20 22:38:51,063 INFO L459 AbstractCegarLoop]: Interpolant automaton has 101 states [2020-07-20 22:38:51,063 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:38:51,063 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2020-07-20 22:38:51,064 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=494, Invalid=10218, Unknown=0, NotChecked=0, Total=10712 [2020-07-20 22:38:51,064 INFO L87 Difference]: Start difference. First operand 449 states and 496 transitions. Second operand 101 states. [2020-07-20 22:39:50,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:39:50,800 INFO L93 Difference]: Finished difference Result 461 states and 509 transitions. [2020-07-20 22:39:50,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 148 states. [2020-07-20 22:39:50,806 INFO L78 Accepts]: Start accepts. Automaton has 101 states. Word has length 634 [2020-07-20 22:39:50,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:39:50,809 INFO L225 Difference]: With dead ends: 461 [2020-07-20 22:39:50,809 INFO L226 Difference]: Without dead ends: 459 [2020-07-20 22:39:50,811 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 696 GetRequests, 541 SyntacticMatches, 3 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8605 ImplicationChecksByTransitivity, 29.4s TimeCoverageRelationStatistics Valid=938, Invalid=22624, Unknown=0, NotChecked=0, Total=23562 [2020-07-20 22:39:50,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 459 states. [2020-07-20 22:39:50,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 459 to 458. [2020-07-20 22:39:50,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 458 states. [2020-07-20 22:39:50,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 458 states to 458 states and 506 transitions. [2020-07-20 22:39:50,852 INFO L78 Accepts]: Start accepts. Automaton has 458 states and 506 transitions. Word has length 634 [2020-07-20 22:39:50,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:39:50,853 INFO L479 AbstractCegarLoop]: Abstraction has 458 states and 506 transitions. [2020-07-20 22:39:50,853 INFO L480 AbstractCegarLoop]: Interpolant automaton has 101 states. [2020-07-20 22:39:50,853 INFO L276 IsEmpty]: Start isEmpty. Operand 458 states and 506 transitions. [2020-07-20 22:39:50,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 648 [2020-07-20 22:39:50,858 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:39:50,858 INFO L422 BasicCegarLoop]: trace histogram [98, 97, 97, 49, 49, 49, 49, 48, 48, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:39:51,058 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:39:51,059 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:39:51,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:39:51,060 INFO L82 PathProgramCache]: Analyzing trace with hash 439207109, now seen corresponding path program 48 times [2020-07-20 22:39:51,060 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:39:51,061 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2104232936] [2020-07-20 22:39:51,061 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 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:39:51,243 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:39:51,244 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:39:51,251 INFO L263 TraceCheckSpWp]: Trace formula consists of 1049 conjuncts, 105 conjunts are in the unsatisfiable core [2020-07-20 22:39:51,257 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:40:09,589 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:40:10,957 INFO L134 CoverageAnalysis]: Checked inductivity of 24602 backedges. 194 proven. 5784 refuted. 0 times theorem prover too weak. 18624 trivial. 0 not checked. [2020-07-20 22:40:10,957 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:40:11,751 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:40:14,130 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2104232936] [2020-07-20 22:40:14,131 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:40:14,131 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [103] total 103 [2020-07-20 22:40:14,132 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [926972787] [2020-07-20 22:40:14,132 INFO L459 AbstractCegarLoop]: Interpolant automaton has 103 states [2020-07-20 22:40:14,133 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:40:14,133 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2020-07-20 22:40:14,134 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=504, Invalid=10626, Unknown=0, NotChecked=0, Total=11130 [2020-07-20 22:40:14,134 INFO L87 Difference]: Start difference. First operand 458 states and 506 transitions. Second operand 103 states. [2020-07-20 22:41:23,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:41:23,312 INFO L93 Difference]: Finished difference Result 470 states and 519 transitions. [2020-07-20 22:41:23,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 151 states. [2020-07-20 22:41:23,319 INFO L78 Accepts]: Start accepts. Automaton has 103 states. Word has length 647 [2020-07-20 22:41:23,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:41:23,322 INFO L225 Difference]: With dead ends: 470 [2020-07-20 22:41:23,322 INFO L226 Difference]: Without dead ends: 468 [2020-07-20 22:41:23,323 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 710 GetRequests, 552 SyntacticMatches, 3 SemanticMatches, 155 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8956 ImplicationChecksByTransitivity, 33.1s TimeCoverageRelationStatistics Valid=957, Invalid=23535, Unknown=0, NotChecked=0, Total=24492 [2020-07-20 22:41:23,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 468 states. [2020-07-20 22:41:23,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 468 to 467. [2020-07-20 22:41:23,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 467 states. [2020-07-20 22:41:23,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 467 states to 467 states and 516 transitions. [2020-07-20 22:41:23,356 INFO L78 Accepts]: Start accepts. Automaton has 467 states and 516 transitions. Word has length 647 [2020-07-20 22:41:23,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:41:23,356 INFO L479 AbstractCegarLoop]: Abstraction has 467 states and 516 transitions. [2020-07-20 22:41:23,357 INFO L480 AbstractCegarLoop]: Interpolant automaton has 103 states. [2020-07-20 22:41:23,357 INFO L276 IsEmpty]: Start isEmpty. Operand 467 states and 516 transitions. [2020-07-20 22:41:23,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 661 [2020-07-20 22:41:23,363 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:41:23,364 INFO L422 BasicCegarLoop]: trace histogram [100, 99, 99, 50, 50, 50, 50, 49, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:41:23,578 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:41:23,579 INFO L427 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:41:23,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:41:23,580 INFO L82 PathProgramCache]: Analyzing trace with hash -1635902195, now seen corresponding path program 49 times [2020-07-20 22:41:23,581 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:41:23,581 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [285377049] [2020-07-20 22:41:23,581 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 52 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:41:23,762 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:41:23,763 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:41:23,771 INFO L263 TraceCheckSpWp]: Trace formula consists of 1069 conjuncts, 107 conjunts are in the unsatisfiable core [2020-07-20 22:41:23,779 INFO L286 TraceCheckSpWp]: Computing forward predicates...