/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic BIGGEST_EQUIVALENCE_CLASS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-invgen/fragtest_simple.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 01:47:25,577 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-07-21 01:47:25,598 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 01:47:25,599 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 01:47:25,600 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 01:47:25,602 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 01:47:25,604 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 01:47:25,605 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 01:47:25,606 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 01:47:25,607 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 01:47:25,608 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 01:47:25,609 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 01:47:25,610 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 01:47:25,611 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 01:47:25,612 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 01:47:25,613 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 01:47:25,615 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 01:47:25,618 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 01:47:25,620 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 01:47:25,621 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 01:47:25,622 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 01:47:25,623 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 01:47:25,626 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 01:47:25,634 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 01:47:25,635 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 01:47:25,636 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 01:47:25,637 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 01:47:25,656 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 01:47:25,657 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 01:47:25,658 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 01:47:25,658 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 01:47:25,659 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 01:47:25,659 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 01:47:25,659 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 01:47:25,659 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 01:47:25,660 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 01:47:25,660 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 01:47:25,660 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 01:47:25,660 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 01:47:25,660 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 01:47:25,661 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 01:47:25,661 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 01:47:25,661 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 01:47:25,662 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 01:47:25,662 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 01:47:25,662 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 01:47:25,663 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 01:47:25,663 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 01:47:25,663 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 01:47:25,663 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 01:47:25,663 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 01:47:25,664 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 01:47:25,664 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 01:47:25,664 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:25,664 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 01:47:25,665 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 01:47:25,665 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> BIGGEST_EQUIVALENCE_CLASS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-21 01:47:26,045 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 01:47:26,059 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 01:47:26,063 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 01:47:26,065 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 01:47:26,065 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 01:47:26,066 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/fragtest_simple.i [2020-07-21 01:47:26,137 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/97b69e824/f4050138a5824de2b25e0f035058fc55/FLAG960ff5d7c [2020-07-21 01:47:26,619 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 01:47:26,619 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/fragtest_simple.i [2020-07-21 01:47:26,627 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/97b69e824/f4050138a5824de2b25e0f035058fc55/FLAG960ff5d7c [2020-07-21 01:47:26,975 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/97b69e824/f4050138a5824de2b25e0f035058fc55 [2020-07-21 01:47:26,984 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 01:47:26,988 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 01:47:26,989 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 01:47:26,989 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 01:47:26,993 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 01:47:26,994 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:47:26" (1/1) ... [2020-07-21 01:47:26,998 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@49cc5e49 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:47:26, skipping insertion in model container [2020-07-21 01:47:26,998 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:47:26" (1/1) ... [2020-07-21 01:47:27,007 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 01:47:27,031 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 01:47:27,222 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 01:47:27,227 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 01:47:27,248 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 01:47:27,263 INFO L208 MainTranslator]: Completed translation [2020-07-21 01:47:27,264 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:47:27 WrapperNode [2020-07-21 01:47:27,264 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 01:47:27,265 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 01:47:27,265 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 01:47:27,265 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 01:47:27,275 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:47:27" (1/1) ... [2020-07-21 01:47:27,275 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:47:27" (1/1) ... [2020-07-21 01:47:27,280 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:47:27" (1/1) ... [2020-07-21 01:47:27,281 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:47:27" (1/1) ... [2020-07-21 01:47:27,284 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:47:27" (1/1) ... [2020-07-21 01:47:27,291 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:47:27" (1/1) ... [2020-07-21 01:47:27,293 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:47:27" (1/1) ... [2020-07-21 01:47:27,389 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 01:47:27,389 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 01:47:27,389 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 01:47:27,390 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 01:47:27,391 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:47:27" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 01:47:27,461 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 01:47:27,461 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 01:47:27,462 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 01:47:27,462 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 01:47:27,462 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 01:47:27,462 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 01:47:27,462 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 01:47:27,462 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 01:47:27,462 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 01:47:27,463 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 01:47:27,463 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 01:47:27,463 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 01:47:27,463 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 01:47:27,698 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 01:47:27,698 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-07-21 01:47:27,703 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:47:27 BoogieIcfgContainer [2020-07-21 01:47:27,704 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 01:47:27,705 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 01:47:27,706 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 01:47:27,710 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 01:47:27,711 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 01:47:26" (1/3) ... [2020-07-21 01:47:27,712 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@ec173ce and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:47:27, skipping insertion in model container [2020-07-21 01:47:27,712 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:47:27" (2/3) ... [2020-07-21 01:47:27,712 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@ec173ce and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:47:27, skipping insertion in model container [2020-07-21 01:47:27,713 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:47:27" (3/3) ... [2020-07-21 01:47:27,715 INFO L109 eAbstractionObserver]: Analyzing ICFG fragtest_simple.i [2020-07-21 01:47:27,727 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 01:47:27,735 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 01:47:27,763 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 01:47:27,800 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 01:47:27,800 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 01:47:27,800 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 01:47:27,801 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 01:47:27,801 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 01:47:27,801 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 01:47:27,802 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 01:47:27,802 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 01:47:27,827 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2020-07-21 01:47:27,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-21 01:47:27,835 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:47:27,836 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:47:27,837 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:47:27,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:47:27,844 INFO L82 PathProgramCache]: Analyzing trace with hash 317368997, now seen corresponding path program 1 times [2020-07-21 01:47:27,856 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:47:27,856 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1369309539] [2020-07-21 01:47:27,857 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:27,927 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 01:47:27,928 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:47:27,931 INFO L263 TraceCheckSpWp]: Trace formula consists of 24 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-21 01:47:27,936 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:47:27,956 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:47:27,957 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:47:27,958 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1369309539] [2020-07-21 01:47:27,959 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:47:27,959 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-21 01:47:27,960 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1488115275] [2020-07-21 01:47:27,965 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-21 01:47:27,965 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:47:27,976 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-21 01:47:27,977 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 01:47:27,979 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 2 states. [2020-07-21 01:47:28,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:47:28,003 INFO L93 Difference]: Finished difference Result 47 states and 62 transitions. [2020-07-21 01:47:28,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-21 01:47:28,004 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2020-07-21 01:47:28,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:47:28,012 INFO L225 Difference]: With dead ends: 47 [2020-07-21 01:47:28,013 INFO L226 Difference]: Without dead ends: 22 [2020-07-21 01:47:28,017 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 01:47:28,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-07-21 01:47:28,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-07-21 01:47:28,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-07-21 01:47:28,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2020-07-21 01:47:28,051 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 15 [2020-07-21 01:47:28,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:47:28,051 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2020-07-21 01:47:28,052 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-21 01:47:28,052 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2020-07-21 01:47:28,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-21 01:47:28,053 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:47:28,053 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:47:28,254 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:28,254 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:47:28,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:47:28,255 INFO L82 PathProgramCache]: Analyzing trace with hash 1632722591, now seen corresponding path program 1 times [2020-07-21 01:47:28,256 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:47:28,257 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [655303980] [2020-07-21 01:47:28,258 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:28,299 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:47:28,299 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:47:28,300 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 01:47:28,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:47:28,345 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 01:47:28,375 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:47:28,375 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:47:28,376 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [655303980] [2020-07-21 01:47:28,376 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:47:28,376 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 01:47:28,377 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [638656481] [2020-07-21 01:47:28,379 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 01:47:28,379 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:47:28,380 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 01:47:28,380 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 01:47:28,380 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand 5 states. [2020-07-21 01:47:28,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:47:28,449 INFO L93 Difference]: Finished difference Result 31 states and 34 transitions. [2020-07-21 01:47:28,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 01:47:28,449 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-07-21 01:47:28,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:47:28,451 INFO L225 Difference]: With dead ends: 31 [2020-07-21 01:47:28,451 INFO L226 Difference]: Without dead ends: 29 [2020-07-21 01:47:28,453 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 01:47:28,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-07-21 01:47:28,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2020-07-21 01:47:28,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-21 01:47:28,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2020-07-21 01:47:28,463 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 17 [2020-07-21 01:47:28,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:47:28,463 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2020-07-21 01:47:28,464 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 01:47:28,464 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2020-07-21 01:47:28,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 01:47:28,465 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:47:28,465 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:47:28,679 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:28,680 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:47:28,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:47:28,681 INFO L82 PathProgramCache]: Analyzing trace with hash -1401298672, now seen corresponding path program 1 times [2020-07-21 01:47:28,682 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:47:28,682 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [43392457] [2020-07-21 01:47:28,683 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 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:28,721 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 01:47:28,722 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:47:28,723 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 01:47:28,725 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:47:28,765 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:47:28,766 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:47:28,766 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [43392457] [2020-07-21 01:47:28,767 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:47:28,767 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 01:47:28,767 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1946399483] [2020-07-21 01:47:28,768 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 01:47:28,768 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:47:28,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 01:47:28,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-07-21 01:47:28,769 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand 5 states. [2020-07-21 01:47:28,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:47:28,856 INFO L93 Difference]: Finished difference Result 49 states and 56 transitions. [2020-07-21 01:47:28,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 01:47:28,857 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 25 [2020-07-21 01:47:28,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:47:28,861 INFO L225 Difference]: With dead ends: 49 [2020-07-21 01:47:28,861 INFO L226 Difference]: Without dead ends: 34 [2020-07-21 01:47:28,862 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2020-07-21 01:47:28,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-07-21 01:47:28,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 30. [2020-07-21 01:47:28,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 01:47:28,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 33 transitions. [2020-07-21 01:47:28,877 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 33 transitions. Word has length 25 [2020-07-21 01:47:28,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:47:28,878 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 33 transitions. [2020-07-21 01:47:28,878 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 01:47:28,878 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 33 transitions. [2020-07-21 01:47:28,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 01:47:28,879 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:47:28,879 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:47:29,092 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:29,093 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:47:29,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:47:29,094 INFO L82 PathProgramCache]: Analyzing trace with hash 1107622837, now seen corresponding path program 1 times [2020-07-21 01:47:29,094 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:47:29,094 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [317084694] [2020-07-21 01:47:29,094 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:29,144 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:47:29,145 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:47:29,148 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 01:47:29,152 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:47:29,199 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:47:29,199 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:47:29,251 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:47:29,252 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [317084694] [2020-07-21 01:47:29,253 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:47:29,253 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2020-07-21 01:47:29,253 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [952674719] [2020-07-21 01:47:29,254 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 01:47:29,254 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:47:29,255 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 01:47:29,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-07-21 01:47:29,255 INFO L87 Difference]: Start difference. First operand 30 states and 33 transitions. Second operand 8 states. [2020-07-21 01:47:29,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:47:29,410 INFO L93 Difference]: Finished difference Result 55 states and 64 transitions. [2020-07-21 01:47:29,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 01:47:29,412 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 27 [2020-07-21 01:47:29,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:47:29,414 INFO L225 Difference]: With dead ends: 55 [2020-07-21 01:47:29,414 INFO L226 Difference]: Without dead ends: 40 [2020-07-21 01:47:29,415 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 45 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2020-07-21 01:47:29,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-07-21 01:47:29,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 32. [2020-07-21 01:47:29,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-07-21 01:47:29,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2020-07-21 01:47:29,433 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 27 [2020-07-21 01:47:29,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:47:29,434 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2020-07-21 01:47:29,434 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 01:47:29,434 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2020-07-21 01:47:29,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-21 01:47:29,437 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:47:29,438 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:47:29,652 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:29,653 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:47:29,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:47:29,653 INFO L82 PathProgramCache]: Analyzing trace with hash -1590427366, now seen corresponding path program 2 times [2020-07-21 01:47:29,654 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:47:29,654 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1745600049] [2020-07-21 01:47:29,655 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:29,707 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:47:29,707 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:47:29,708 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 01:47:29,710 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:47:29,731 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 01:47:29,748 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:47:29,748 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:47:29,769 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:47:29,803 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:47:29,803 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1745600049] [2020-07-21 01:47:29,804 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:47:29,804 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2020-07-21 01:47:29,804 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [278974362] [2020-07-21 01:47:29,805 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 01:47:29,805 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:47:29,805 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 01:47:29,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-07-21 01:47:29,806 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand 8 states. [2020-07-21 01:47:29,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:47:29,878 INFO L93 Difference]: Finished difference Result 51 states and 56 transitions. [2020-07-21 01:47:29,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 01:47:29,879 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 29 [2020-07-21 01:47:29,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:47:29,880 INFO L225 Difference]: With dead ends: 51 [2020-07-21 01:47:29,881 INFO L226 Difference]: Without dead ends: 49 [2020-07-21 01:47:29,881 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 47 SyntacticMatches, 4 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-07-21 01:47:29,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-07-21 01:47:29,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 44. [2020-07-21 01:47:29,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-07-21 01:47:29,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2020-07-21 01:47:29,891 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 29 [2020-07-21 01:47:29,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:47:29,891 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2020-07-21 01:47:29,892 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 01:47:29,892 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2020-07-21 01:47:29,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-07-21 01:47:29,894 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:47:29,895 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:47:30,109 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:30,109 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:47:30,110 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:47:30,110 INFO L82 PathProgramCache]: Analyzing trace with hash -30298372, now seen corresponding path program 3 times [2020-07-21 01:47:30,110 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:47:30,111 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1428694992] [2020-07-21 01:47:30,111 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:30,168 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 01:47:30,168 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:47:30,169 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 01:47:30,177 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:47:30,246 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 28 proven. 6 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-07-21 01:47:30,246 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:47:30,319 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 22 proven. 6 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2020-07-21 01:47:30,320 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1428694992] [2020-07-21 01:47:30,320 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:47:30,321 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 11 [2020-07-21 01:47:30,321 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1530547617] [2020-07-21 01:47:30,322 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 01:47:30,322 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:47:30,322 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 01:47:30,322 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-07-21 01:47:30,323 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand 11 states. [2020-07-21 01:47:30,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:47:30,452 INFO L93 Difference]: Finished difference Result 83 states and 96 transitions. [2020-07-21 01:47:30,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 01:47:30,453 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 45 [2020-07-21 01:47:30,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:47:30,455 INFO L225 Difference]: With dead ends: 83 [2020-07-21 01:47:30,455 INFO L226 Difference]: Without dead ends: 58 [2020-07-21 01:47:30,456 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 77 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2020-07-21 01:47:30,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-21 01:47:30,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 46. [2020-07-21 01:47:30,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 01:47:30,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2020-07-21 01:47:30,465 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 45 [2020-07-21 01:47:30,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:47:30,466 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2020-07-21 01:47:30,466 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 01:47:30,466 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2020-07-21 01:47:30,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-07-21 01:47:30,467 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:47:30,468 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:47:30,681 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:30,682 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:47:30,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:47:30,683 INFO L82 PathProgramCache]: Analyzing trace with hash 130155809, now seen corresponding path program 4 times [2020-07-21 01:47:30,683 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:47:30,684 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1308559658] [2020-07-21 01:47:30,684 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:30,725 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:47:30,725 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:47:30,726 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 01:47:30,729 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:47:30,838 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 24 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 01:47:30,839 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:47:30,934 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 24 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 01:47:30,944 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1308559658] [2020-07-21 01:47:30,944 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:47:30,944 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 14 [2020-07-21 01:47:30,945 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1219676245] [2020-07-21 01:47:30,945 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 01:47:30,946 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:47:30,946 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 01:47:30,946 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=129, Unknown=0, NotChecked=0, Total=182 [2020-07-21 01:47:30,947 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 14 states. [2020-07-21 01:47:31,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:47:31,164 INFO L93 Difference]: Finished difference Result 87 states and 103 transitions. [2020-07-21 01:47:31,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 01:47:31,164 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 47 [2020-07-21 01:47:31,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:47:31,171 INFO L225 Difference]: With dead ends: 87 [2020-07-21 01:47:31,172 INFO L226 Difference]: Without dead ends: 64 [2020-07-21 01:47:31,175 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 77 SyntacticMatches, 4 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2020-07-21 01:47:31,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-21 01:47:31,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 48. [2020-07-21 01:47:31,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-07-21 01:47:31,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 52 transitions. [2020-07-21 01:47:31,193 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 52 transitions. Word has length 47 [2020-07-21 01:47:31,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:47:31,193 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 52 transitions. [2020-07-21 01:47:31,193 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 01:47:31,194 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 52 transitions. [2020-07-21 01:47:31,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-07-21 01:47:31,195 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:47:31,199 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:47:31,413 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:31,414 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:47:31,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:47:31,415 INFO L82 PathProgramCache]: Analyzing trace with hash -292198906, now seen corresponding path program 5 times [2020-07-21 01:47:31,415 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:47:31,416 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [652536248] [2020-07-21 01:47:31,416 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:31,467 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:47:31,468 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:47:31,469 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 01:47:31,477 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:47:31,526 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 01:47:31,542 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 26 proven. 18 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 01:47:31,543 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:47:31,560 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:47:31,616 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 26 proven. 18 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 01:47:31,617 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [652536248] [2020-07-21 01:47:31,617 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:47:31,617 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2020-07-21 01:47:31,618 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1020134806] [2020-07-21 01:47:31,619 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 01:47:31,619 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:47:31,619 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 01:47:31,619 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2020-07-21 01:47:31,620 INFO L87 Difference]: Start difference. First operand 48 states and 52 transitions. Second operand 10 states. [2020-07-21 01:47:31,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:47:31,726 INFO L93 Difference]: Finished difference Result 67 states and 73 transitions. [2020-07-21 01:47:31,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 01:47:31,727 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 49 [2020-07-21 01:47:31,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:47:31,729 INFO L225 Difference]: With dead ends: 67 [2020-07-21 01:47:31,729 INFO L226 Difference]: Without dead ends: 65 [2020-07-21 01:47:31,733 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 81 SyntacticMatches, 8 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 01:47:31,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-07-21 01:47:31,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 60. [2020-07-21 01:47:31,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-21 01:47:31,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 65 transitions. [2020-07-21 01:47:31,751 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 65 transitions. Word has length 49 [2020-07-21 01:47:31,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:47:31,756 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 65 transitions. [2020-07-21 01:47:31,756 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 01:47:31,756 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 65 transitions. [2020-07-21 01:47:31,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-21 01:47:31,758 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:47:31,758 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:47:31,974 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:31,975 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:47:31,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:47:31,975 INFO L82 PathProgramCache]: Analyzing trace with hash 551795688, now seen corresponding path program 6 times [2020-07-21 01:47:31,976 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:47:31,976 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [944897961] [2020-07-21 01:47:31,977 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:32,022 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:47:32,022 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:47:32,023 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 01:47:32,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:47:32,165 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 72 proven. 20 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-07-21 01:47:32,165 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:47:32,305 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 58 proven. 20 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2020-07-21 01:47:32,305 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [944897961] [2020-07-21 01:47:32,306 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:47:32,306 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 17 [2020-07-21 01:47:32,306 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1965319322] [2020-07-21 01:47:32,307 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 01:47:32,307 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:47:32,307 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 01:47:32,308 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=196, Unknown=0, NotChecked=0, Total=272 [2020-07-21 01:47:32,308 INFO L87 Difference]: Start difference. First operand 60 states and 65 transitions. Second operand 17 states. [2020-07-21 01:47:32,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:47:32,565 INFO L93 Difference]: Finished difference Result 115 states and 135 transitions. [2020-07-21 01:47:32,565 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 01:47:32,565 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 65 [2020-07-21 01:47:32,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:47:32,567 INFO L225 Difference]: With dead ends: 115 [2020-07-21 01:47:32,567 INFO L226 Difference]: Without dead ends: 82 [2020-07-21 01:47:32,568 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 109 SyntacticMatches, 5 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2020-07-21 01:47:32,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-07-21 01:47:32,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 62. [2020-07-21 01:47:32,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-07-21 01:47:32,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 67 transitions. [2020-07-21 01:47:32,577 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 67 transitions. Word has length 65 [2020-07-21 01:47:32,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:47:32,577 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 67 transitions. [2020-07-21 01:47:32,577 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 01:47:32,578 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 67 transitions. [2020-07-21 01:47:32,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-21 01:47:32,579 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:47:32,579 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:47:32,793 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:32,794 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:47:32,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:47:32,794 INFO L82 PathProgramCache]: Analyzing trace with hash -150434419, now seen corresponding path program 7 times [2020-07-21 01:47:32,795 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:47:32,795 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [136828948] [2020-07-21 01:47:32,796 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:32,842 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:47:32,842 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:47:32,843 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 01:47:32,846 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:47:33,002 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 60 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-21 01:47:33,003 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:47:33,152 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 60 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-21 01:47:33,153 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [136828948] [2020-07-21 01:47:33,153 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:47:33,153 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 20 [2020-07-21 01:47:33,154 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1503675841] [2020-07-21 01:47:33,154 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 01:47:33,155 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:47:33,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 01:47:33,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=277, Unknown=0, NotChecked=0, Total=380 [2020-07-21 01:47:33,155 INFO L87 Difference]: Start difference. First operand 62 states and 67 transitions. Second operand 20 states. [2020-07-21 01:47:33,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:47:33,422 INFO L93 Difference]: Finished difference Result 119 states and 142 transitions. [2020-07-21 01:47:33,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 01:47:33,423 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 67 [2020-07-21 01:47:33,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:47:33,424 INFO L225 Difference]: With dead ends: 119 [2020-07-21 01:47:33,425 INFO L226 Difference]: Without dead ends: 88 [2020-07-21 01:47:33,426 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 109 SyntacticMatches, 6 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 130 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2020-07-21 01:47:33,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-21 01:47:33,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 64. [2020-07-21 01:47:33,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-07-21 01:47:33,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 69 transitions. [2020-07-21 01:47:33,445 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 69 transitions. Word has length 67 [2020-07-21 01:47:33,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:47:33,446 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 69 transitions. [2020-07-21 01:47:33,446 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 01:47:33,446 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 69 transitions. [2020-07-21 01:47:33,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-07-21 01:47:33,447 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:47:33,447 INFO L422 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:47:33,660 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:33,661 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:47:33,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:47:33,661 INFO L82 PathProgramCache]: Analyzing trace with hash -683701774, now seen corresponding path program 8 times [2020-07-21 01:47:33,662 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:47:33,662 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [583620494] [2020-07-21 01:47:33,662 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:33,708 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:47:33,708 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:47:33,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 01:47:33,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:47:33,773 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 01:47:33,791 INFO L134 CoverageAnalysis]: Checked inductivity of 142 backedges. 52 proven. 50 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-21 01:47:33,791 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:47:33,805 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:47:33,910 INFO L134 CoverageAnalysis]: Checked inductivity of 142 backedges. 52 proven. 50 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-21 01:47:33,911 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [583620494] [2020-07-21 01:47:33,912 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:47:33,912 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2020-07-21 01:47:33,912 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2119235626] [2020-07-21 01:47:33,913 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 01:47:33,914 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:47:33,914 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 01:47:33,915 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=83, Unknown=0, NotChecked=0, Total=132 [2020-07-21 01:47:33,915 INFO L87 Difference]: Start difference. First operand 64 states and 69 transitions. Second operand 12 states. [2020-07-21 01:47:34,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:47:34,030 INFO L93 Difference]: Finished difference Result 83 states and 90 transitions. [2020-07-21 01:47:34,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 01:47:34,031 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 69 [2020-07-21 01:47:34,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:47:34,032 INFO L225 Difference]: With dead ends: 83 [2020-07-21 01:47:34,032 INFO L226 Difference]: Without dead ends: 81 [2020-07-21 01:47:34,033 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 115 SyntacticMatches, 12 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=53, Invalid=103, Unknown=0, NotChecked=0, Total=156 [2020-07-21 01:47:34,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-07-21 01:47:34,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 76. [2020-07-21 01:47:34,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 01:47:34,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 82 transitions. [2020-07-21 01:47:34,042 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 82 transitions. Word has length 69 [2020-07-21 01:47:34,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:47:34,043 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 82 transitions. [2020-07-21 01:47:34,043 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 01:47:34,043 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 82 transitions. [2020-07-21 01:47:34,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-07-21 01:47:34,044 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:47:34,044 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 7, 7, 7, 7, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:47:34,257 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:34,258 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:47:34,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:47:34,259 INFO L82 PathProgramCache]: Analyzing trace with hash 192972756, now seen corresponding path program 9 times [2020-07-21 01:47:34,259 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:47:34,259 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2088299189] [2020-07-21 01:47:34,260 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:34,322 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:47:34,322 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:47:34,324 INFO L263 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 01:47:34,327 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:47:34,492 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 132 proven. 42 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-07-21 01:47:34,493 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:47:34,686 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 110 proven. 42 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2020-07-21 01:47:34,686 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2088299189] [2020-07-21 01:47:34,686 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:47:34,687 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 23 [2020-07-21 01:47:34,687 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1579576572] [2020-07-21 01:47:34,688 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 01:47:34,688 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:47:34,688 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 01:47:34,689 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 01:47:34,689 INFO L87 Difference]: Start difference. First operand 76 states and 82 transitions. Second operand 23 states. [2020-07-21 01:47:34,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:47:34,972 INFO L93 Difference]: Finished difference Result 147 states and 174 transitions. [2020-07-21 01:47:34,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 01:47:34,973 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 85 [2020-07-21 01:47:34,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:47:34,974 INFO L225 Difference]: With dead ends: 147 [2020-07-21 01:47:34,975 INFO L226 Difference]: Without dead ends: 106 [2020-07-21 01:47:34,977 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 141 SyntacticMatches, 7 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 183 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2020-07-21 01:47:34,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-07-21 01:47:34,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 78. [2020-07-21 01:47:34,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-07-21 01:47:34,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 84 transitions. [2020-07-21 01:47:34,995 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 84 transitions. Word has length 85 [2020-07-21 01:47:34,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:47:34,995 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 84 transitions. [2020-07-21 01:47:34,995 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 01:47:34,995 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 84 transitions. [2020-07-21 01:47:34,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-07-21 01:47:34,996 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:47:34,997 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:47:35,210 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:35,211 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:47:35,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:47:35,211 INFO L82 PathProgramCache]: Analyzing trace with hash 1722356985, now seen corresponding path program 10 times [2020-07-21 01:47:35,212 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:47:35,212 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1063451260] [2020-07-21 01:47:35,212 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:35,268 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:47:35,268 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:47:35,270 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 01:47:35,272 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:47:35,476 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 112 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-21 01:47:35,476 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:47:35,691 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 112 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-21 01:47:35,695 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1063451260] [2020-07-21 01:47:35,696 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:47:35,696 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 26 [2020-07-21 01:47:35,696 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1692815354] [2020-07-21 01:47:35,697 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-21 01:47:35,697 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:47:35,698 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-21 01:47:35,698 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=481, Unknown=0, NotChecked=0, Total=650 [2020-07-21 01:47:35,699 INFO L87 Difference]: Start difference. First operand 78 states and 84 transitions. Second operand 26 states. [2020-07-21 01:47:36,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:47:36,029 INFO L93 Difference]: Finished difference Result 151 states and 181 transitions. [2020-07-21 01:47:36,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-21 01:47:36,030 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 87 [2020-07-21 01:47:36,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:47:36,031 INFO L225 Difference]: With dead ends: 151 [2020-07-21 01:47:36,031 INFO L226 Difference]: Without dead ends: 112 [2020-07-21 01:47:36,032 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 141 SyntacticMatches, 8 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2020-07-21 01:47:36,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-07-21 01:47:36,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 80. [2020-07-21 01:47:36,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-07-21 01:47:36,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 86 transitions. [2020-07-21 01:47:36,039 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 86 transitions. Word has length 87 [2020-07-21 01:47:36,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:47:36,039 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 86 transitions. [2020-07-21 01:47:36,040 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-21 01:47:36,040 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 86 transitions. [2020-07-21 01:47:36,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-07-21 01:47:36,041 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:47:36,041 INFO L422 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:47:36,255 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:36,256 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:47:36,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:47:36,257 INFO L82 PathProgramCache]: Analyzing trace with hash -1713181474, now seen corresponding path program 11 times [2020-07-21 01:47:36,257 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:47:36,258 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1409700043] [2020-07-21 01:47:36,258 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:36,319 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:47:36,320 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:47:36,322 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 01:47:36,324 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:47:36,402 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 01:47:36,430 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 86 proven. 98 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-21 01:47:36,431 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:47:36,448 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:47:36,571 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 86 proven. 98 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-21 01:47:36,572 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1409700043] [2020-07-21 01:47:36,572 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:47:36,572 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 14 [2020-07-21 01:47:36,572 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [783766706] [2020-07-21 01:47:36,573 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 01:47:36,573 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:47:36,573 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 01:47:36,574 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=112, Unknown=0, NotChecked=0, Total=182 [2020-07-21 01:47:36,574 INFO L87 Difference]: Start difference. First operand 80 states and 86 transitions. Second operand 14 states. [2020-07-21 01:47:36,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:47:36,720 INFO L93 Difference]: Finished difference Result 99 states and 107 transitions. [2020-07-21 01:47:36,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 01:47:36,721 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 89 [2020-07-21 01:47:36,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:47:36,722 INFO L225 Difference]: With dead ends: 99 [2020-07-21 01:47:36,722 INFO L226 Difference]: Without dead ends: 97 [2020-07-21 01:47:36,723 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 149 SyntacticMatches, 16 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=74, Invalid=136, Unknown=0, NotChecked=0, Total=210 [2020-07-21 01:47:36,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-07-21 01:47:36,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 92. [2020-07-21 01:47:36,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2020-07-21 01:47:36,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 99 transitions. [2020-07-21 01:47:36,731 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 99 transitions. Word has length 89 [2020-07-21 01:47:36,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:47:36,731 INFO L479 AbstractCegarLoop]: Abstraction has 92 states and 99 transitions. [2020-07-21 01:47:36,731 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 01:47:36,731 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 99 transitions. [2020-07-21 01:47:36,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2020-07-21 01:47:36,733 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:47:36,733 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 9, 9, 9, 9, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:47:36,939 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:36,940 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:47:36,940 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:47:36,941 INFO L82 PathProgramCache]: Analyzing trace with hash -1950838080, now seen corresponding path program 12 times [2020-07-21 01:47:36,941 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:47:36,941 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [670532171] [2020-07-21 01:47:36,942 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:37,000 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:47:37,001 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:47:37,003 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 01:47:37,005 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:47:37,263 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 208 proven. 72 refuted. 0 times theorem prover too weak. 116 trivial. 0 not checked. [2020-07-21 01:47:37,263 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:47:37,528 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 178 proven. 72 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2020-07-21 01:47:37,529 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [670532171] [2020-07-21 01:47:37,529 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:47:37,529 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 29 [2020-07-21 01:47:37,529 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [304163284] [2020-07-21 01:47:37,530 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 01:47:37,530 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:47:37,530 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 01:47:37,531 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=604, Unknown=0, NotChecked=0, Total=812 [2020-07-21 01:47:37,531 INFO L87 Difference]: Start difference. First operand 92 states and 99 transitions. Second operand 29 states. [2020-07-21 01:47:37,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:47:37,970 INFO L93 Difference]: Finished difference Result 179 states and 213 transitions. [2020-07-21 01:47:37,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-21 01:47:37,970 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 105 [2020-07-21 01:47:37,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:47:37,972 INFO L225 Difference]: With dead ends: 179 [2020-07-21 01:47:37,973 INFO L226 Difference]: Without dead ends: 130 [2020-07-21 01:47:37,974 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 173 SyntacticMatches, 9 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 316 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=397, Invalid=1009, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 01:47:37,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2020-07-21 01:47:37,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 94. [2020-07-21 01:47:37,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2020-07-21 01:47:37,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 101 transitions. [2020-07-21 01:47:37,982 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 101 transitions. Word has length 105 [2020-07-21 01:47:37,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:47:37,982 INFO L479 AbstractCegarLoop]: Abstraction has 94 states and 101 transitions. [2020-07-21 01:47:37,982 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 01:47:37,983 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 101 transitions. [2020-07-21 01:47:37,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2020-07-21 01:47:37,984 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:47:37,984 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:47:38,186 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:38,187 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:47:38,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:47:38,188 INFO L82 PathProgramCache]: Analyzing trace with hash -734782619, now seen corresponding path program 13 times [2020-07-21 01:47:38,188 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:47:38,188 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [722751794] [2020-07-21 01:47:38,189 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:38,253 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:47:38,253 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:47:38,255 INFO L263 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 01:47:38,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:47:38,509 INFO L134 CoverageAnalysis]: Checked inductivity of 414 backedges. 180 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-07-21 01:47:38,509 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:47:38,802 INFO L134 CoverageAnalysis]: Checked inductivity of 414 backedges. 180 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-07-21 01:47:38,802 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [722751794] [2020-07-21 01:47:38,802 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:47:38,803 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 32 [2020-07-21 01:47:38,803 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1250460470] [2020-07-21 01:47:38,803 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-07-21 01:47:38,804 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:47:38,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-07-21 01:47:38,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=741, Unknown=0, NotChecked=0, Total=992 [2020-07-21 01:47:38,805 INFO L87 Difference]: Start difference. First operand 94 states and 101 transitions. Second operand 32 states. [2020-07-21 01:47:39,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:47:39,277 INFO L93 Difference]: Finished difference Result 183 states and 220 transitions. [2020-07-21 01:47:39,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-21 01:47:39,277 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 107 [2020-07-21 01:47:39,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:47:39,279 INFO L225 Difference]: With dead ends: 183 [2020-07-21 01:47:39,279 INFO L226 Difference]: Without dead ends: 136 [2020-07-21 01:47:39,281 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 173 SyntacticMatches, 10 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 396 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=481, Invalid=1241, Unknown=0, NotChecked=0, Total=1722 [2020-07-21 01:47:39,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2020-07-21 01:47:39,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 96. [2020-07-21 01:47:39,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2020-07-21 01:47:39,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 103 transitions. [2020-07-21 01:47:39,288 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 103 transitions. Word has length 107 [2020-07-21 01:47:39,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:47:39,289 INFO L479 AbstractCegarLoop]: Abstraction has 96 states and 103 transitions. [2020-07-21 01:47:39,289 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-07-21 01:47:39,289 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 103 transitions. [2020-07-21 01:47:39,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-21 01:47:39,290 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:47:39,290 INFO L422 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:47:39,504 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:39,505 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:47:39,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:47:39,505 INFO L82 PathProgramCache]: Analyzing trace with hash -336589110, now seen corresponding path program 14 times [2020-07-21 01:47:39,506 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:47:39,506 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [338742931] [2020-07-21 01:47:39,506 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:39,566 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:47:39,566 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:47:39,568 INFO L263 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-21 01:47:39,571 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:47:39,672 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 01:47:39,698 INFO L134 CoverageAnalysis]: Checked inductivity of 434 backedges. 128 proven. 162 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-07-21 01:47:39,699 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:47:39,720 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:47:39,921 INFO L134 CoverageAnalysis]: Checked inductivity of 434 backedges. 128 proven. 162 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-07-21 01:47:39,924 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [338742931] [2020-07-21 01:47:39,929 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:47:39,929 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 16 [2020-07-21 01:47:39,930 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1304083848] [2020-07-21 01:47:39,930 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 01:47:39,931 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:47:39,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 01:47:39,931 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=145, Unknown=0, NotChecked=0, Total=240 [2020-07-21 01:47:39,931 INFO L87 Difference]: Start difference. First operand 96 states and 103 transitions. Second operand 16 states. [2020-07-21 01:47:40,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:47:40,078 INFO L93 Difference]: Finished difference Result 115 states and 124 transitions. [2020-07-21 01:47:40,078 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 01:47:40,078 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 109 [2020-07-21 01:47:40,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:47:40,080 INFO L225 Difference]: With dead ends: 115 [2020-07-21 01:47:40,081 INFO L226 Difference]: Without dead ends: 113 [2020-07-21 01:47:40,084 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 183 SyntacticMatches, 20 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 169 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=99, Invalid=173, Unknown=0, NotChecked=0, Total=272 [2020-07-21 01:47:40,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2020-07-21 01:47:40,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 108. [2020-07-21 01:47:40,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2020-07-21 01:47:40,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 116 transitions. [2020-07-21 01:47:40,093 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 116 transitions. Word has length 109 [2020-07-21 01:47:40,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:47:40,093 INFO L479 AbstractCegarLoop]: Abstraction has 108 states and 116 transitions. [2020-07-21 01:47:40,093 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 01:47:40,093 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 116 transitions. [2020-07-21 01:47:40,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2020-07-21 01:47:40,095 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:47:40,095 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 12, 11, 11, 11, 11, 11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:47:40,308 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:40,309 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:47:40,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:47:40,310 INFO L82 PathProgramCache]: Analyzing trace with hash 1711037612, now seen corresponding path program 15 times [2020-07-21 01:47:40,310 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:47:40,310 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1438765608] [2020-07-21 01:47:40,311 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:40,373 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:47:40,374 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:47:40,376 INFO L263 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 01:47:40,379 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:47:40,692 INFO L134 CoverageAnalysis]: Checked inductivity of 594 backedges. 300 proven. 110 refuted. 0 times theorem prover too weak. 184 trivial. 0 not checked. [2020-07-21 01:47:40,693 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:47:41,058 INFO L134 CoverageAnalysis]: Checked inductivity of 594 backedges. 262 proven. 110 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2020-07-21 01:47:41,058 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1438765608] [2020-07-21 01:47:41,059 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:47:41,059 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 35 [2020-07-21 01:47:41,059 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [706993446] [2020-07-21 01:47:41,060 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-21 01:47:41,060 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:47:41,060 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-21 01:47:41,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=298, Invalid=892, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 01:47:41,061 INFO L87 Difference]: Start difference. First operand 108 states and 116 transitions. Second operand 35 states. [2020-07-21 01:47:41,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:47:41,572 INFO L93 Difference]: Finished difference Result 211 states and 252 transitions. [2020-07-21 01:47:41,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-21 01:47:41,573 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 125 [2020-07-21 01:47:41,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:47:41,574 INFO L225 Difference]: With dead ends: 211 [2020-07-21 01:47:41,575 INFO L226 Difference]: Without dead ends: 154 [2020-07-21 01:47:41,576 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 205 SyntacticMatches, 11 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 485 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=573, Invalid=1497, Unknown=0, NotChecked=0, Total=2070 [2020-07-21 01:47:41,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2020-07-21 01:47:41,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 110. [2020-07-21 01:47:41,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2020-07-21 01:47:41,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 118 transitions. [2020-07-21 01:47:41,585 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 118 transitions. Word has length 125 [2020-07-21 01:47:41,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:47:41,585 INFO L479 AbstractCegarLoop]: Abstraction has 110 states and 118 transitions. [2020-07-21 01:47:41,585 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-07-21 01:47:41,586 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 118 transitions. [2020-07-21 01:47:41,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2020-07-21 01:47:41,587 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:47:41,587 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:47:41,802 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:41,803 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:47:41,803 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:47:41,804 INFO L82 PathProgramCache]: Analyzing trace with hash 66724049, now seen corresponding path program 16 times [2020-07-21 01:47:41,804 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:47:41,805 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1298396394] [2020-07-21 01:47:41,805 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:41,874 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:47:41,875 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:47:41,876 INFO L263 TraceCheckSpWp]: Trace formula consists of 340 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 01:47:41,878 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:47:42,230 INFO L134 CoverageAnalysis]: Checked inductivity of 616 backedges. 264 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-07-21 01:47:42,230 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:47:42,675 INFO L134 CoverageAnalysis]: Checked inductivity of 616 backedges. 264 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-07-21 01:47:42,675 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1298396394] [2020-07-21 01:47:42,675 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:47:42,676 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 38 [2020-07-21 01:47:42,676 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1488661332] [2020-07-21 01:47:42,680 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-07-21 01:47:42,680 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:47:42,681 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-07-21 01:47:42,681 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=349, Invalid=1057, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 01:47:42,681 INFO L87 Difference]: Start difference. First operand 110 states and 118 transitions. Second operand 38 states. [2020-07-21 01:47:43,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:47:43,221 INFO L93 Difference]: Finished difference Result 215 states and 259 transitions. [2020-07-21 01:47:43,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-21 01:47:43,221 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 127 [2020-07-21 01:47:43,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:47:43,223 INFO L225 Difference]: With dead ends: 215 [2020-07-21 01:47:43,223 INFO L226 Difference]: Without dead ends: 160 [2020-07-21 01:47:43,225 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 265 GetRequests, 205 SyntacticMatches, 12 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 583 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=673, Invalid=1777, Unknown=0, NotChecked=0, Total=2450 [2020-07-21 01:47:43,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2020-07-21 01:47:43,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 112. [2020-07-21 01:47:43,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2020-07-21 01:47:43,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 120 transitions. [2020-07-21 01:47:43,233 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 120 transitions. Word has length 127 [2020-07-21 01:47:43,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:47:43,233 INFO L479 AbstractCegarLoop]: Abstraction has 112 states and 120 transitions. [2020-07-21 01:47:43,233 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-07-21 01:47:43,233 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 120 transitions. [2020-07-21 01:47:43,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2020-07-21 01:47:43,234 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:47:43,235 INFO L422 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 12, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:47:43,445 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:43,445 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:47:43,445 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:47:43,446 INFO L82 PathProgramCache]: Analyzing trace with hash 429354934, now seen corresponding path program 17 times [2020-07-21 01:47:43,446 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:47:43,446 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [449983776] [2020-07-21 01:47:43,447 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:43,510 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:47:43,510 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:47:43,512 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-21 01:47:43,514 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:47:43,636 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 01:47:43,665 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 178 proven. 242 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-07-21 01:47:43,665 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:47:43,684 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:47:43,963 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 178 proven. 242 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-07-21 01:47:43,963 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [449983776] [2020-07-21 01:47:43,963 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:47:43,964 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2020-07-21 01:47:43,964 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1861661409] [2020-07-21 01:47:43,965 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 01:47:43,965 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:47:43,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 01:47:43,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=182, Unknown=0, NotChecked=0, Total=306 [2020-07-21 01:47:43,966 INFO L87 Difference]: Start difference. First operand 112 states and 120 transitions. Second operand 18 states. [2020-07-21 01:47:44,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:47:44,133 INFO L93 Difference]: Finished difference Result 131 states and 141 transitions. [2020-07-21 01:47:44,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-21 01:47:44,134 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 129 [2020-07-21 01:47:44,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:47:44,136 INFO L225 Difference]: With dead ends: 131 [2020-07-21 01:47:44,136 INFO L226 Difference]: Without dead ends: 129 [2020-07-21 01:47:44,137 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 217 SyntacticMatches, 24 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 227 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=128, Invalid=214, Unknown=0, NotChecked=0, Total=342 [2020-07-21 01:47:44,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2020-07-21 01:47:44,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 124. [2020-07-21 01:47:44,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2020-07-21 01:47:44,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 133 transitions. [2020-07-21 01:47:44,145 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 133 transitions. Word has length 129 [2020-07-21 01:47:44,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:47:44,145 INFO L479 AbstractCegarLoop]: Abstraction has 124 states and 133 transitions. [2020-07-21 01:47:44,145 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 01:47:44,145 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 133 transitions. [2020-07-21 01:47:44,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2020-07-21 01:47:44,146 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:47:44,147 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 13, 13, 13, 13, 13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:47:44,359 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:44,360 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:47:44,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:47:44,361 INFO L82 PathProgramCache]: Analyzing trace with hash 1971086744, now seen corresponding path program 18 times [2020-07-21 01:47:44,361 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:47:44,361 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [392624251] [2020-07-21 01:47:44,362 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:44,430 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:47:44,430 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:47:44,431 INFO L263 TraceCheckSpWp]: Trace formula consists of 384 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 01:47:44,435 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:47:44,875 INFO L134 CoverageAnalysis]: Checked inductivity of 832 backedges. 408 proven. 156 refuted. 0 times theorem prover too weak. 268 trivial. 0 not checked. [2020-07-21 01:47:44,875 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:47:45,420 INFO L134 CoverageAnalysis]: Checked inductivity of 832 backedges. 362 proven. 156 refuted. 0 times theorem prover too weak. 314 trivial. 0 not checked. [2020-07-21 01:47:45,421 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [392624251] [2020-07-21 01:47:45,421 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:47:45,422 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 41 [2020-07-21 01:47:45,422 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1509883378] [2020-07-21 01:47:45,422 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-07-21 01:47:45,423 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:47:45,423 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-07-21 01:47:45,424 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=404, Invalid=1236, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 01:47:45,424 INFO L87 Difference]: Start difference. First operand 124 states and 133 transitions. Second operand 41 states. [2020-07-21 01:47:46,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:47:46,101 INFO L93 Difference]: Finished difference Result 243 states and 291 transitions. [2020-07-21 01:47:46,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-07-21 01:47:46,102 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 145 [2020-07-21 01:47:46,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:47:46,104 INFO L225 Difference]: With dead ends: 243 [2020-07-21 01:47:46,104 INFO L226 Difference]: Without dead ends: 178 [2020-07-21 01:47:46,106 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 302 GetRequests, 237 SyntacticMatches, 13 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 690 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=781, Invalid=2081, Unknown=0, NotChecked=0, Total=2862 [2020-07-21 01:47:46,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2020-07-21 01:47:46,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 126. [2020-07-21 01:47:46,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2020-07-21 01:47:46,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 135 transitions. [2020-07-21 01:47:46,114 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 135 transitions. Word has length 145 [2020-07-21 01:47:46,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:47:46,114 INFO L479 AbstractCegarLoop]: Abstraction has 126 states and 135 transitions. [2020-07-21 01:47:46,114 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-07-21 01:47:46,114 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 135 transitions. [2020-07-21 01:47:46,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2020-07-21 01:47:46,115 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:47:46,116 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:47:46,327 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:46,328 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:47:46,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:47:46,329 INFO L82 PathProgramCache]: Analyzing trace with hash 554411325, now seen corresponding path program 19 times [2020-07-21 01:47:46,329 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:47:46,329 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1943378125] [2020-07-21 01:47:46,330 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:46,396 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:47:46,396 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:47:46,398 INFO L263 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 30 conjunts are in the unsatisfiable core [2020-07-21 01:47:46,400 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:47:46,919 INFO L134 CoverageAnalysis]: Checked inductivity of 858 backedges. 364 proven. 182 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2020-07-21 01:47:46,919 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:47:47,471 INFO L134 CoverageAnalysis]: Checked inductivity of 858 backedges. 364 proven. 182 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2020-07-21 01:47:47,472 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1943378125] [2020-07-21 01:47:47,472 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:47:47,472 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30] total 44 [2020-07-21 01:47:47,472 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1496037476] [2020-07-21 01:47:47,473 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-07-21 01:47:47,473 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:47:47,473 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-07-21 01:47:47,474 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=463, Invalid=1429, Unknown=0, NotChecked=0, Total=1892 [2020-07-21 01:47:47,474 INFO L87 Difference]: Start difference. First operand 126 states and 135 transitions. Second operand 44 states. [2020-07-21 01:47:48,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:47:48,204 INFO L93 Difference]: Finished difference Result 247 states and 298 transitions. [2020-07-21 01:47:48,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-07-21 01:47:48,204 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 147 [2020-07-21 01:47:48,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:47:48,207 INFO L225 Difference]: With dead ends: 247 [2020-07-21 01:47:48,207 INFO L226 Difference]: Without dead ends: 184 [2020-07-21 01:47:48,209 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 307 GetRequests, 237 SyntacticMatches, 14 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 806 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=897, Invalid=2409, Unknown=0, NotChecked=0, Total=3306 [2020-07-21 01:47:48,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2020-07-21 01:47:48,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 128. [2020-07-21 01:47:48,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2020-07-21 01:47:48,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 137 transitions. [2020-07-21 01:47:48,217 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 137 transitions. Word has length 147 [2020-07-21 01:47:48,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:47:48,218 INFO L479 AbstractCegarLoop]: Abstraction has 128 states and 137 transitions. [2020-07-21 01:47:48,218 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-07-21 01:47:48,218 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 137 transitions. [2020-07-21 01:47:48,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2020-07-21 01:47:48,219 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:47:48,219 INFO L422 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:47:48,433 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:48,434 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:47:48,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:47:48,435 INFO L82 PathProgramCache]: Analyzing trace with hash 633966498, now seen corresponding path program 20 times [2020-07-21 01:47:48,435 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:47:48,436 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1769981122] [2020-07-21 01:47:48,436 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:48,527 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:47:48,527 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:47:48,528 INFO L263 TraceCheckSpWp]: Trace formula consists of 404 conjuncts, 31 conjunts are in the unsatisfiable core [2020-07-21 01:47:48,530 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:47:48,689 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 01:47:48,727 INFO L134 CoverageAnalysis]: Checked inductivity of 886 backedges. 236 proven. 338 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2020-07-21 01:47:48,727 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:47:48,748 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:47:49,065 INFO L134 CoverageAnalysis]: Checked inductivity of 886 backedges. 236 proven. 338 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2020-07-21 01:47:49,065 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1769981122] [2020-07-21 01:47:49,065 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:47:49,065 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 20 [2020-07-21 01:47:49,066 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1807773225] [2020-07-21 01:47:49,066 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 01:47:49,066 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:47:49,066 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 01:47:49,067 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=223, Unknown=0, NotChecked=0, Total=380 [2020-07-21 01:47:49,067 INFO L87 Difference]: Start difference. First operand 128 states and 137 transitions. Second operand 20 states. [2020-07-21 01:47:49,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:47:49,270 INFO L93 Difference]: Finished difference Result 147 states and 158 transitions. [2020-07-21 01:47:49,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-21 01:47:49,271 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 149 [2020-07-21 01:47:49,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:47:49,273 INFO L225 Difference]: With dead ends: 147 [2020-07-21 01:47:49,273 INFO L226 Difference]: Without dead ends: 145 [2020-07-21 01:47:49,274 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 251 SyntacticMatches, 28 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 293 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=161, Invalid=259, Unknown=0, NotChecked=0, Total=420 [2020-07-21 01:47:49,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2020-07-21 01:47:49,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 140. [2020-07-21 01:47:49,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2020-07-21 01:47:49,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 150 transitions. [2020-07-21 01:47:49,284 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 150 transitions. Word has length 149 [2020-07-21 01:47:49,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:47:49,285 INFO L479 AbstractCegarLoop]: Abstraction has 140 states and 150 transitions. [2020-07-21 01:47:49,285 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 01:47:49,285 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 150 transitions. [2020-07-21 01:47:49,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2020-07-21 01:47:49,286 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:47:49,286 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 16, 15, 15, 15, 15, 15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:47:49,500 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:49,501 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:47:49,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:47:49,502 INFO L82 PathProgramCache]: Analyzing trace with hash -869716604, now seen corresponding path program 21 times [2020-07-21 01:47:49,502 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:47:49,502 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [30921314] [2020-07-21 01:47:49,503 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:49,581 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:47:49,582 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:47:49,584 INFO L263 TraceCheckSpWp]: Trace formula consists of 438 conjuncts, 32 conjunts are in the unsatisfiable core [2020-07-21 01:47:49,587 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:47:50,111 INFO L134 CoverageAnalysis]: Checked inductivity of 1110 backedges. 532 proven. 210 refuted. 0 times theorem prover too weak. 368 trivial. 0 not checked. [2020-07-21 01:47:50,111 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:47:50,704 INFO L134 CoverageAnalysis]: Checked inductivity of 1110 backedges. 478 proven. 210 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2020-07-21 01:47:50,704 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [30921314] [2020-07-21 01:47:50,704 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:47:50,704 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32] total 47 [2020-07-21 01:47:50,705 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2078754026] [2020-07-21 01:47:50,705 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-07-21 01:47:50,705 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:47:50,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-07-21 01:47:50,706 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=526, Invalid=1636, Unknown=0, NotChecked=0, Total=2162 [2020-07-21 01:47:50,707 INFO L87 Difference]: Start difference. First operand 140 states and 150 transitions. Second operand 47 states. [2020-07-21 01:47:51,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:47:51,508 INFO L93 Difference]: Finished difference Result 275 states and 330 transitions. [2020-07-21 01:47:51,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-07-21 01:47:51,509 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 165 [2020-07-21 01:47:51,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:47:51,511 INFO L225 Difference]: With dead ends: 275 [2020-07-21 01:47:51,511 INFO L226 Difference]: Without dead ends: 202 [2020-07-21 01:47:51,513 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 344 GetRequests, 269 SyntacticMatches, 15 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 931 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1021, Invalid=2761, Unknown=0, NotChecked=0, Total=3782 [2020-07-21 01:47:51,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2020-07-21 01:47:51,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 142. [2020-07-21 01:47:51,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2020-07-21 01:47:51,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 152 transitions. [2020-07-21 01:47:51,523 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 152 transitions. Word has length 165 [2020-07-21 01:47:51,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:47:51,524 INFO L479 AbstractCegarLoop]: Abstraction has 142 states and 152 transitions. [2020-07-21 01:47:51,524 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-07-21 01:47:51,524 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 152 transitions. [2020-07-21 01:47:51,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2020-07-21 01:47:51,525 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:47:51,525 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 15, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:47:51,739 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:51,740 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:47:51,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:47:51,741 INFO L82 PathProgramCache]: Analyzing trace with hash -583456599, now seen corresponding path program 22 times [2020-07-21 01:47:51,741 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:47:51,741 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [912294494] [2020-07-21 01:47:51,742 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:51,819 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:47:51,819 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:47:51,821 INFO L263 TraceCheckSpWp]: Trace formula consists of 448 conjuncts, 34 conjunts are in the unsatisfiable core [2020-07-21 01:47:51,824 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:47:52,395 INFO L134 CoverageAnalysis]: Checked inductivity of 1140 backedges. 480 proven. 240 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-21 01:47:52,396 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:47:53,072 INFO L134 CoverageAnalysis]: Checked inductivity of 1140 backedges. 480 proven. 240 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-21 01:47:53,073 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [912294494] [2020-07-21 01:47:53,073 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:47:53,073 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34] total 50 [2020-07-21 01:47:53,073 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1176455800] [2020-07-21 01:47:53,074 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-07-21 01:47:53,074 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:47:53,074 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-07-21 01:47:53,075 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=593, Invalid=1857, Unknown=0, NotChecked=0, Total=2450 [2020-07-21 01:47:53,075 INFO L87 Difference]: Start difference. First operand 142 states and 152 transitions. Second operand 50 states. [2020-07-21 01:47:54,094 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:47:54,094 INFO L93 Difference]: Finished difference Result 279 states and 337 transitions. [2020-07-21 01:47:54,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-21 01:47:54,095 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 167 [2020-07-21 01:47:54,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:47:54,099 INFO L225 Difference]: With dead ends: 279 [2020-07-21 01:47:54,100 INFO L226 Difference]: Without dead ends: 208 [2020-07-21 01:47:54,107 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 269 SyntacticMatches, 16 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1065 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1153, Invalid=3137, Unknown=0, NotChecked=0, Total=4290 [2020-07-21 01:47:54,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2020-07-21 01:47:54,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 144. [2020-07-21 01:47:54,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2020-07-21 01:47:54,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 154 transitions. [2020-07-21 01:47:54,122 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 154 transitions. Word has length 167 [2020-07-21 01:47:54,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:47:54,122 INFO L479 AbstractCegarLoop]: Abstraction has 144 states and 154 transitions. [2020-07-21 01:47:54,122 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-07-21 01:47:54,123 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 154 transitions. [2020-07-21 01:47:54,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2020-07-21 01:47:54,125 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:47:54,125 INFO L422 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:47:54,330 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:54,331 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:47:54,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:47:54,332 INFO L82 PathProgramCache]: Analyzing trace with hash -365498738, now seen corresponding path program 23 times [2020-07-21 01:47:54,332 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:47:54,332 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1911771838] [2020-07-21 01:47:54,332 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:54,424 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:47:54,425 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:47:54,428 INFO L263 TraceCheckSpWp]: Trace formula consists of 458 conjuncts, 35 conjunts are in the unsatisfiable core [2020-07-21 01:47:54,432 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:47:54,631 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 01:47:54,677 INFO L134 CoverageAnalysis]: Checked inductivity of 1172 backedges. 302 proven. 450 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-21 01:47:54,678 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:47:54,706 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:47:55,095 INFO L134 CoverageAnalysis]: Checked inductivity of 1172 backedges. 302 proven. 450 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-21 01:47:55,095 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1911771838] [2020-07-21 01:47:55,095 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:47:55,096 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 22 [2020-07-21 01:47:55,096 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1707547503] [2020-07-21 01:47:55,096 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 01:47:55,096 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:47:55,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 01:47:55,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=268, Unknown=0, NotChecked=0, Total=462 [2020-07-21 01:47:55,097 INFO L87 Difference]: Start difference. First operand 144 states and 154 transitions. Second operand 22 states. [2020-07-21 01:47:55,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:47:55,329 INFO L93 Difference]: Finished difference Result 163 states and 175 transitions. [2020-07-21 01:47:55,330 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-21 01:47:55,330 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 169 [2020-07-21 01:47:55,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:47:55,332 INFO L225 Difference]: With dead ends: 163 [2020-07-21 01:47:55,332 INFO L226 Difference]: Without dead ends: 161 [2020-07-21 01:47:55,336 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 338 GetRequests, 285 SyntacticMatches, 32 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 367 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=198, Invalid=308, Unknown=0, NotChecked=0, Total=506 [2020-07-21 01:47:55,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2020-07-21 01:47:55,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 156. [2020-07-21 01:47:55,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2020-07-21 01:47:55,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 167 transitions. [2020-07-21 01:47:55,352 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 167 transitions. Word has length 169 [2020-07-21 01:47:55,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:47:55,352 INFO L479 AbstractCegarLoop]: Abstraction has 156 states and 167 transitions. [2020-07-21 01:47:55,353 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 01:47:55,353 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 167 transitions. [2020-07-21 01:47:55,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2020-07-21 01:47:55,354 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:47:55,354 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 18, 17, 17, 17, 17, 17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:47:55,567 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:55,568 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:47:55,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:47:55,569 INFO L82 PathProgramCache]: Analyzing trace with hash -760007568, now seen corresponding path program 24 times [2020-07-21 01:47:55,569 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:47:55,569 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1534411712] [2020-07-21 01:47:55,570 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 [2020-07-21 01:47:55,697 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:47:55,697 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:47:55,701 INFO L263 TraceCheckSpWp]: Trace formula consists of 492 conjuncts, 36 conjunts are in the unsatisfiable core [2020-07-21 01:47:55,706 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:47:56,434 INFO L134 CoverageAnalysis]: Checked inductivity of 1428 backedges. 672 proven. 272 refuted. 0 times theorem prover too weak. 484 trivial. 0 not checked. [2020-07-21 01:47:56,434 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:47:57,198 INFO L134 CoverageAnalysis]: Checked inductivity of 1428 backedges. 610 proven. 272 refuted. 0 times theorem prover too weak. 546 trivial. 0 not checked. [2020-07-21 01:47:57,198 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1534411712] [2020-07-21 01:47:57,198 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:47:57,198 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36] total 53 [2020-07-21 01:47:57,199 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1568022408] [2020-07-21 01:47:57,199 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2020-07-21 01:47:57,199 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:47:57,200 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2020-07-21 01:47:57,200 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=664, Invalid=2092, Unknown=0, NotChecked=0, Total=2756 [2020-07-21 01:47:57,200 INFO L87 Difference]: Start difference. First operand 156 states and 167 transitions. Second operand 53 states. [2020-07-21 01:47:58,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:47:58,300 INFO L93 Difference]: Finished difference Result 307 states and 369 transitions. [2020-07-21 01:47:58,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-07-21 01:47:58,300 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 185 [2020-07-21 01:47:58,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:47:58,303 INFO L225 Difference]: With dead ends: 307 [2020-07-21 01:47:58,303 INFO L226 Difference]: Without dead ends: 226 [2020-07-21 01:47:58,305 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 386 GetRequests, 301 SyntacticMatches, 17 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1208 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1293, Invalid=3537, Unknown=0, NotChecked=0, Total=4830 [2020-07-21 01:47:58,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2020-07-21 01:47:58,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 158. [2020-07-21 01:47:58,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 158 states. [2020-07-21 01:47:58,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 169 transitions. [2020-07-21 01:47:58,318 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 169 transitions. Word has length 185 [2020-07-21 01:47:58,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:47:58,318 INFO L479 AbstractCegarLoop]: Abstraction has 158 states and 169 transitions. [2020-07-21 01:47:58,318 INFO L480 AbstractCegarLoop]: Interpolant automaton has 53 states. [2020-07-21 01:47:58,318 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 169 transitions. [2020-07-21 01:47:58,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2020-07-21 01:47:58,320 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:47:58,320 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 17, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:47:58,534 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:58,535 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:47:58,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:47:58,536 INFO L82 PathProgramCache]: Analyzing trace with hash -1861014763, now seen corresponding path program 25 times [2020-07-21 01:47:58,536 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:47:58,536 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [566552676] [2020-07-21 01:47:58,537 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 [2020-07-21 01:47:58,630 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:47:58,630 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:47:58,632 INFO L263 TraceCheckSpWp]: Trace formula consists of 502 conjuncts, 38 conjunts are in the unsatisfiable core [2020-07-21 01:47:58,635 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:47:59,355 INFO L134 CoverageAnalysis]: Checked inductivity of 1462 backedges. 612 proven. 306 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2020-07-21 01:47:59,355 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:48:00,209 INFO L134 CoverageAnalysis]: Checked inductivity of 1462 backedges. 612 proven. 306 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2020-07-21 01:48:00,209 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [566552676] [2020-07-21 01:48:00,209 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:48:00,210 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38] total 56 [2020-07-21 01:48:00,210 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [915659483] [2020-07-21 01:48:00,211 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2020-07-21 01:48:00,211 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:48:00,212 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2020-07-21 01:48:00,213 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=739, Invalid=2341, Unknown=0, NotChecked=0, Total=3080 [2020-07-21 01:48:00,213 INFO L87 Difference]: Start difference. First operand 158 states and 169 transitions. Second operand 56 states. [2020-07-21 01:48:01,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:48:01,281 INFO L93 Difference]: Finished difference Result 311 states and 376 transitions. [2020-07-21 01:48:01,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-07-21 01:48:01,281 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 187 [2020-07-21 01:48:01,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:48:01,284 INFO L225 Difference]: With dead ends: 311 [2020-07-21 01:48:01,284 INFO L226 Difference]: Without dead ends: 232 [2020-07-21 01:48:01,286 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 391 GetRequests, 301 SyntacticMatches, 18 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1360 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1441, Invalid=3961, Unknown=0, NotChecked=0, Total=5402 [2020-07-21 01:48:01,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2020-07-21 01:48:01,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 160. [2020-07-21 01:48:01,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2020-07-21 01:48:01,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 171 transitions. [2020-07-21 01:48:01,297 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 171 transitions. Word has length 187 [2020-07-21 01:48:01,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:48:01,298 INFO L479 AbstractCegarLoop]: Abstraction has 160 states and 171 transitions. [2020-07-21 01:48:01,298 INFO L480 AbstractCegarLoop]: Interpolant automaton has 56 states. [2020-07-21 01:48:01,298 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 171 transitions. [2020-07-21 01:48:01,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2020-07-21 01:48:01,299 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:48:01,300 INFO L422 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 18, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:48:01,514 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:01,515 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:48:01,515 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:48:01,516 INFO L82 PathProgramCache]: Analyzing trace with hash 927992954, now seen corresponding path program 26 times [2020-07-21 01:48:01,516 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:48:01,516 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [350087798] [2020-07-21 01:48:01,517 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:01,604 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:48:01,605 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:48:01,607 INFO L263 TraceCheckSpWp]: Trace formula consists of 512 conjuncts, 39 conjunts are in the unsatisfiable core [2020-07-21 01:48:01,610 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:48:01,854 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 01:48:01,975 INFO L134 CoverageAnalysis]: Checked inductivity of 1498 backedges. 376 proven. 578 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2020-07-21 01:48:01,975 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:48:02,015 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:48:02,550 INFO L134 CoverageAnalysis]: Checked inductivity of 1498 backedges. 376 proven. 578 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2020-07-21 01:48:02,550 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [350087798] [2020-07-21 01:48:02,551 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:48:02,551 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 24 [2020-07-21 01:48:02,551 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [820592923] [2020-07-21 01:48:02,551 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 01:48:02,552 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:48:02,552 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 01:48:02,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=235, Invalid=317, Unknown=0, NotChecked=0, Total=552 [2020-07-21 01:48:02,552 INFO L87 Difference]: Start difference. First operand 160 states and 171 transitions. Second operand 24 states. [2020-07-21 01:48:02,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:48:02,803 INFO L93 Difference]: Finished difference Result 179 states and 192 transitions. [2020-07-21 01:48:02,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-21 01:48:02,804 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 189 [2020-07-21 01:48:02,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:48:02,806 INFO L225 Difference]: With dead ends: 179 [2020-07-21 01:48:02,806 INFO L226 Difference]: Without dead ends: 177 [2020-07-21 01:48:02,806 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 319 SyntacticMatches, 36 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 449 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=239, Invalid=361, Unknown=0, NotChecked=0, Total=600 [2020-07-21 01:48:02,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2020-07-21 01:48:02,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 172. [2020-07-21 01:48:02,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 172 states. [2020-07-21 01:48:02,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 184 transitions. [2020-07-21 01:48:02,818 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 184 transitions. Word has length 189 [2020-07-21 01:48:02,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:48:02,818 INFO L479 AbstractCegarLoop]: Abstraction has 172 states and 184 transitions. [2020-07-21 01:48:02,818 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 01:48:02,819 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 184 transitions. [2020-07-21 01:48:02,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2020-07-21 01:48:02,820 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:48:02,820 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 20, 19, 19, 19, 19, 19, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:48:03,033 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:03,034 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:48:03,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:48:03,035 INFO L82 PathProgramCache]: Analyzing trace with hash 1753938524, now seen corresponding path program 27 times [2020-07-21 01:48:03,035 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:48:03,035 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1038947995] [2020-07-21 01:48:03,036 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 [2020-07-21 01:48:03,122 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:48:03,122 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:48:03,124 INFO L263 TraceCheckSpWp]: Trace formula consists of 546 conjuncts, 40 conjunts are in the unsatisfiable core [2020-07-21 01:48:03,140 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:48:03,952 INFO L134 CoverageAnalysis]: Checked inductivity of 1786 backedges. 828 proven. 342 refuted. 0 times theorem prover too weak. 616 trivial. 0 not checked. [2020-07-21 01:48:03,952 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:48:04,886 INFO L134 CoverageAnalysis]: Checked inductivity of 1786 backedges. 758 proven. 342 refuted. 0 times theorem prover too weak. 686 trivial. 0 not checked. [2020-07-21 01:48:04,886 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1038947995] [2020-07-21 01:48:04,886 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:48:04,886 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40] total 59 [2020-07-21 01:48:04,886 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [21602189] [2020-07-21 01:48:04,887 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2020-07-21 01:48:04,887 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:48:04,888 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2020-07-21 01:48:04,888 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=818, Invalid=2604, Unknown=0, NotChecked=0, Total=3422 [2020-07-21 01:48:04,888 INFO L87 Difference]: Start difference. First operand 172 states and 184 transitions. Second operand 59 states. [2020-07-21 01:48:06,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:48:06,099 INFO L93 Difference]: Finished difference Result 339 states and 408 transitions. [2020-07-21 01:48:06,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-07-21 01:48:06,099 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 205 [2020-07-21 01:48:06,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:48:06,101 INFO L225 Difference]: With dead ends: 339 [2020-07-21 01:48:06,102 INFO L226 Difference]: Without dead ends: 250 [2020-07-21 01:48:06,105 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 428 GetRequests, 333 SyntacticMatches, 19 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1521 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1597, Invalid=4409, Unknown=0, NotChecked=0, Total=6006 [2020-07-21 01:48:06,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2020-07-21 01:48:06,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 174. [2020-07-21 01:48:06,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2020-07-21 01:48:06,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 186 transitions. [2020-07-21 01:48:06,119 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 186 transitions. Word has length 205 [2020-07-21 01:48:06,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:48:06,119 INFO L479 AbstractCegarLoop]: Abstraction has 174 states and 186 transitions. [2020-07-21 01:48:06,119 INFO L480 AbstractCegarLoop]: Interpolant automaton has 59 states. [2020-07-21 01:48:06,119 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 186 transitions. [2020-07-21 01:48:06,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 208 [2020-07-21 01:48:06,121 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:48:06,121 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 20, 20, 19, 19, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:48:06,335 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:06,336 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:48:06,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:48:06,337 INFO L82 PathProgramCache]: Analyzing trace with hash 1542073473, now seen corresponding path program 28 times [2020-07-21 01:48:06,337 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:48:06,338 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2080150574] [2020-07-21 01:48:06,338 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 [2020-07-21 01:48:06,442 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:48:06,442 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:48:06,446 INFO L263 TraceCheckSpWp]: Trace formula consists of 556 conjuncts, 42 conjunts are in the unsatisfiable core [2020-07-21 01:48:06,450 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:48:07,381 INFO L134 CoverageAnalysis]: Checked inductivity of 1824 backedges. 760 proven. 380 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2020-07-21 01:48:07,381 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:48:08,462 INFO L134 CoverageAnalysis]: Checked inductivity of 1824 backedges. 760 proven. 380 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2020-07-21 01:48:08,463 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2080150574] [2020-07-21 01:48:08,464 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:48:08,464 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42] total 62 [2020-07-21 01:48:08,464 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1145130189] [2020-07-21 01:48:08,468 INFO L459 AbstractCegarLoop]: Interpolant automaton has 62 states [2020-07-21 01:48:08,468 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:48:08,469 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2020-07-21 01:48:08,470 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=901, Invalid=2881, Unknown=0, NotChecked=0, Total=3782 [2020-07-21 01:48:08,471 INFO L87 Difference]: Start difference. First operand 174 states and 186 transitions. Second operand 62 states. [2020-07-21 01:48:09,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:48:09,896 INFO L93 Difference]: Finished difference Result 343 states and 415 transitions. [2020-07-21 01:48:09,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-07-21 01:48:09,896 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 207 [2020-07-21 01:48:09,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:48:09,898 INFO L225 Difference]: With dead ends: 343 [2020-07-21 01:48:09,898 INFO L226 Difference]: Without dead ends: 256 [2020-07-21 01:48:09,900 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 433 GetRequests, 333 SyntacticMatches, 20 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1691 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1761, Invalid=4881, Unknown=0, NotChecked=0, Total=6642 [2020-07-21 01:48:09,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2020-07-21 01:48:09,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 176. [2020-07-21 01:48:09,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2020-07-21 01:48:09,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 188 transitions. [2020-07-21 01:48:09,910 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 188 transitions. Word has length 207 [2020-07-21 01:48:09,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:48:09,911 INFO L479 AbstractCegarLoop]: Abstraction has 176 states and 188 transitions. [2020-07-21 01:48:09,911 INFO L480 AbstractCegarLoop]: Interpolant automaton has 62 states. [2020-07-21 01:48:09,911 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 188 transitions. [2020-07-21 01:48:09,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2020-07-21 01:48:09,912 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:48:09,913 INFO L422 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 20, 19, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:48:10,120 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:10,121 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:48:10,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:48:10,122 INFO L82 PathProgramCache]: Analyzing trace with hash -196777626, now seen corresponding path program 29 times [2020-07-21 01:48:10,122 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:48:10,122 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1980112114] [2020-07-21 01:48:10,122 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:10,223 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:48:10,223 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:48:10,225 INFO L263 TraceCheckSpWp]: Trace formula consists of 566 conjuncts, 43 conjunts are in the unsatisfiable core [2020-07-21 01:48:10,228 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:48:10,529 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 01:48:10,586 INFO L134 CoverageAnalysis]: Checked inductivity of 1864 backedges. 458 proven. 722 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2020-07-21 01:48:10,587 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:48:10,617 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:48:11,208 INFO L134 CoverageAnalysis]: Checked inductivity of 1864 backedges. 458 proven. 722 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2020-07-21 01:48:11,208 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1980112114] [2020-07-21 01:48:11,209 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:48:11,209 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 26 [2020-07-21 01:48:11,209 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [860714354] [2020-07-21 01:48:11,210 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-21 01:48:11,210 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:48:11,210 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-21 01:48:11,210 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=280, Invalid=370, Unknown=0, NotChecked=0, Total=650 [2020-07-21 01:48:11,210 INFO L87 Difference]: Start difference. First operand 176 states and 188 transitions. Second operand 26 states. [2020-07-21 01:48:11,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:48:11,516 INFO L93 Difference]: Finished difference Result 195 states and 209 transitions. [2020-07-21 01:48:11,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-21 01:48:11,517 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 209 [2020-07-21 01:48:11,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:48:11,519 INFO L225 Difference]: With dead ends: 195 [2020-07-21 01:48:11,519 INFO L226 Difference]: Without dead ends: 193 [2020-07-21 01:48:11,520 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 418 GetRequests, 353 SyntacticMatches, 40 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 539 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=284, Invalid=418, Unknown=0, NotChecked=0, Total=702 [2020-07-21 01:48:11,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2020-07-21 01:48:11,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 188. [2020-07-21 01:48:11,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 188 states. [2020-07-21 01:48:11,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 201 transitions. [2020-07-21 01:48:11,530 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 201 transitions. Word has length 209 [2020-07-21 01:48:11,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:48:11,531 INFO L479 AbstractCegarLoop]: Abstraction has 188 states and 201 transitions. [2020-07-21 01:48:11,531 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-21 01:48:11,531 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 201 transitions. [2020-07-21 01:48:11,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 226 [2020-07-21 01:48:11,533 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:48:11,533 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 22, 21, 21, 21, 21, 21, 21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:48:11,746 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:11,747 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:48:11,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:48:11,748 INFO L82 PathProgramCache]: Analyzing trace with hash 65077064, now seen corresponding path program 30 times [2020-07-21 01:48:11,748 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:48:11,748 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1341973363] [2020-07-21 01:48:11,748 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 01:48:11,876 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:48:11,876 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:48:11,879 INFO L263 TraceCheckSpWp]: Trace formula consists of 600 conjuncts, 44 conjunts are in the unsatisfiable core [2020-07-21 01:48:11,883 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:48:12,860 INFO L134 CoverageAnalysis]: Checked inductivity of 2184 backedges. 1000 proven. 420 refuted. 0 times theorem prover too weak. 764 trivial. 0 not checked. [2020-07-21 01:48:12,860 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:48:14,031 INFO L134 CoverageAnalysis]: Checked inductivity of 2184 backedges. 922 proven. 420 refuted. 0 times theorem prover too weak. 842 trivial. 0 not checked. [2020-07-21 01:48:14,032 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1341973363] [2020-07-21 01:48:14,032 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:48:14,032 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44] total 65 [2020-07-21 01:48:14,032 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [43460072] [2020-07-21 01:48:14,033 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2020-07-21 01:48:14,033 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:48:14,033 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2020-07-21 01:48:14,034 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=988, Invalid=3172, Unknown=0, NotChecked=0, Total=4160 [2020-07-21 01:48:14,034 INFO L87 Difference]: Start difference. First operand 188 states and 201 transitions. Second operand 65 states. [2020-07-21 01:48:15,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:48:15,491 INFO L93 Difference]: Finished difference Result 371 states and 447 transitions. [2020-07-21 01:48:15,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-07-21 01:48:15,491 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 225 [2020-07-21 01:48:15,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:48:15,493 INFO L225 Difference]: With dead ends: 371 [2020-07-21 01:48:15,494 INFO L226 Difference]: Without dead ends: 274 [2020-07-21 01:48:15,495 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 470 GetRequests, 365 SyntacticMatches, 21 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1870 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1933, Invalid=5377, Unknown=0, NotChecked=0, Total=7310 [2020-07-21 01:48:15,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2020-07-21 01:48:15,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 190. [2020-07-21 01:48:15,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2020-07-21 01:48:15,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 203 transitions. [2020-07-21 01:48:15,507 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 203 transitions. Word has length 225 [2020-07-21 01:48:15,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:48:15,507 INFO L479 AbstractCegarLoop]: Abstraction has 190 states and 203 transitions. [2020-07-21 01:48:15,507 INFO L480 AbstractCegarLoop]: Interpolant automaton has 65 states. [2020-07-21 01:48:15,507 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 203 transitions. [2020-07-21 01:48:15,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 228 [2020-07-21 01:48:15,509 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:48:15,509 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 22, 22, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:48:15,724 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:15,725 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:48:15,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:48:15,726 INFO L82 PathProgramCache]: Analyzing trace with hash 1137618157, now seen corresponding path program 31 times [2020-07-21 01:48:15,726 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:48:15,726 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1147655443] [2020-07-21 01:48:15,727 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 [2020-07-21 01:48:15,833 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:48:15,833 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:48:15,836 INFO L263 TraceCheckSpWp]: Trace formula consists of 610 conjuncts, 46 conjunts are in the unsatisfiable core [2020-07-21 01:48:15,840 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:48:16,924 INFO L134 CoverageAnalysis]: Checked inductivity of 2226 backedges. 924 proven. 462 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2020-07-21 01:48:16,924 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:48:18,222 INFO L134 CoverageAnalysis]: Checked inductivity of 2226 backedges. 924 proven. 462 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2020-07-21 01:48:18,223 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1147655443] [2020-07-21 01:48:18,223 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:48:18,223 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46] total 68 [2020-07-21 01:48:18,224 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1544332729] [2020-07-21 01:48:18,224 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2020-07-21 01:48:18,224 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:48:18,225 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2020-07-21 01:48:18,225 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1079, Invalid=3477, Unknown=0, NotChecked=0, Total=4556 [2020-07-21 01:48:18,225 INFO L87 Difference]: Start difference. First operand 190 states and 203 transitions. Second operand 68 states. [2020-07-21 01:48:19,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:48:19,810 INFO L93 Difference]: Finished difference Result 375 states and 454 transitions. [2020-07-21 01:48:19,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-07-21 01:48:19,811 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 227 [2020-07-21 01:48:19,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:48:19,813 INFO L225 Difference]: With dead ends: 375 [2020-07-21 01:48:19,813 INFO L226 Difference]: Without dead ends: 280 [2020-07-21 01:48:19,814 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 475 GetRequests, 365 SyntacticMatches, 22 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2058 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=2113, Invalid=5897, Unknown=0, NotChecked=0, Total=8010 [2020-07-21 01:48:19,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 280 states. [2020-07-21 01:48:19,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 280 to 192. [2020-07-21 01:48:19,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2020-07-21 01:48:19,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 205 transitions. [2020-07-21 01:48:19,826 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 205 transitions. Word has length 227 [2020-07-21 01:48:19,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:48:19,826 INFO L479 AbstractCegarLoop]: Abstraction has 192 states and 205 transitions. [2020-07-21 01:48:19,826 INFO L480 AbstractCegarLoop]: Interpolant automaton has 68 states. [2020-07-21 01:48:19,827 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 205 transitions. [2020-07-21 01:48:19,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 230 [2020-07-21 01:48:19,828 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:48:19,828 INFO L422 BasicCegarLoop]: trace histogram [23, 22, 22, 22, 22, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:48:20,041 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:20,042 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:48:20,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:48:20,043 INFO L82 PathProgramCache]: Analyzing trace with hash 1057457490, now seen corresponding path program 32 times [2020-07-21 01:48:20,043 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:48:20,043 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [616955878] [2020-07-21 01:48:20,043 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 [2020-07-21 01:48:20,148 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:48:20,148 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:48:20,151 INFO L263 TraceCheckSpWp]: Trace formula consists of 620 conjuncts, 47 conjunts are in the unsatisfiable core [2020-07-21 01:48:20,154 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:48:20,515 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 01:48:20,578 INFO L134 CoverageAnalysis]: Checked inductivity of 2270 backedges. 548 proven. 882 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2020-07-21 01:48:20,579 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:48:20,611 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:48:21,361 INFO L134 CoverageAnalysis]: Checked inductivity of 2270 backedges. 548 proven. 882 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2020-07-21 01:48:21,361 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [616955878] [2020-07-21 01:48:21,362 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:48:21,362 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 28 [2020-07-21 01:48:21,362 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1519941672] [2020-07-21 01:48:21,363 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-07-21 01:48:21,363 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:48:21,364 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-07-21 01:48:21,364 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=329, Invalid=427, Unknown=0, NotChecked=0, Total=756 [2020-07-21 01:48:21,364 INFO L87 Difference]: Start difference. First operand 192 states and 205 transitions. Second operand 28 states. [2020-07-21 01:48:21,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:48:21,680 INFO L93 Difference]: Finished difference Result 211 states and 226 transitions. [2020-07-21 01:48:21,681 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-07-21 01:48:21,681 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 229 [2020-07-21 01:48:21,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:48:21,683 INFO L225 Difference]: With dead ends: 211 [2020-07-21 01:48:21,683 INFO L226 Difference]: Without dead ends: 209 [2020-07-21 01:48:21,683 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 458 GetRequests, 387 SyntacticMatches, 44 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 637 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=333, Invalid=479, Unknown=0, NotChecked=0, Total=812 [2020-07-21 01:48:21,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2020-07-21 01:48:21,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 204. [2020-07-21 01:48:21,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 204 states. [2020-07-21 01:48:21,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 218 transitions. [2020-07-21 01:48:21,694 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 218 transitions. Word has length 229 [2020-07-21 01:48:21,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:48:21,695 INFO L479 AbstractCegarLoop]: Abstraction has 204 states and 218 transitions. [2020-07-21 01:48:21,695 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-07-21 01:48:21,695 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 218 transitions. [2020-07-21 01:48:21,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 246 [2020-07-21 01:48:21,696 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:48:21,697 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 24, 23, 23, 23, 23, 23, 23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:48:21,897 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:21,898 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:48:21,898 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:48:21,898 INFO L82 PathProgramCache]: Analyzing trace with hash -777665740, now seen corresponding path program 33 times [2020-07-21 01:48:21,899 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:48:21,899 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [200808059] [2020-07-21 01:48:21,899 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 [2020-07-21 01:48:22,015 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:48:22,015 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:48:22,019 INFO L263 TraceCheckSpWp]: Trace formula consists of 654 conjuncts, 48 conjunts are in the unsatisfiable core [2020-07-21 01:48:22,023 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:48:23,197 INFO L134 CoverageAnalysis]: Checked inductivity of 2622 backedges. 1188 proven. 506 refuted. 0 times theorem prover too weak. 928 trivial. 0 not checked. [2020-07-21 01:48:23,197 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:48:24,612 INFO L134 CoverageAnalysis]: Checked inductivity of 2622 backedges. 1102 proven. 506 refuted. 0 times theorem prover too weak. 1014 trivial. 0 not checked. [2020-07-21 01:48:24,612 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [200808059] [2020-07-21 01:48:24,612 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:48:24,613 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48] total 71 [2020-07-21 01:48:24,613 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1522177655] [2020-07-21 01:48:24,613 INFO L459 AbstractCegarLoop]: Interpolant automaton has 71 states [2020-07-21 01:48:24,614 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:48:24,614 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2020-07-21 01:48:24,615 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1174, Invalid=3796, Unknown=0, NotChecked=0, Total=4970 [2020-07-21 01:48:24,615 INFO L87 Difference]: Start difference. First operand 204 states and 218 transitions. Second operand 71 states. [2020-07-21 01:48:26,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:48:26,305 INFO L93 Difference]: Finished difference Result 403 states and 486 transitions. [2020-07-21 01:48:26,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-21 01:48:26,305 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 245 [2020-07-21 01:48:26,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:48:26,307 INFO L225 Difference]: With dead ends: 403 [2020-07-21 01:48:26,307 INFO L226 Difference]: Without dead ends: 298 [2020-07-21 01:48:26,309 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 512 GetRequests, 397 SyntacticMatches, 23 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2255 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=2301, Invalid=6441, Unknown=0, NotChecked=0, Total=8742 [2020-07-21 01:48:26,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 298 states. [2020-07-21 01:48:26,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 298 to 206. [2020-07-21 01:48:26,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 206 states. [2020-07-21 01:48:26,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 220 transitions. [2020-07-21 01:48:26,321 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 220 transitions. Word has length 245 [2020-07-21 01:48:26,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:48:26,322 INFO L479 AbstractCegarLoop]: Abstraction has 206 states and 220 transitions. [2020-07-21 01:48:26,322 INFO L480 AbstractCegarLoop]: Interpolant automaton has 71 states. [2020-07-21 01:48:26,322 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 220 transitions. [2020-07-21 01:48:26,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 248 [2020-07-21 01:48:26,324 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:48:26,324 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 24, 24, 23, 23, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:48:26,538 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:26,539 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:48:26,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:48:26,540 INFO L82 PathProgramCache]: Analyzing trace with hash 1435577433, now seen corresponding path program 34 times [2020-07-21 01:48:26,540 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:48:26,540 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [385409175] [2020-07-21 01:48:26,540 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 [2020-07-21 01:48:26,648 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:48:26,648 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:48:26,651 INFO L263 TraceCheckSpWp]: Trace formula consists of 664 conjuncts, 50 conjunts are in the unsatisfiable core [2020-07-21 01:48:26,654 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:48:27,965 INFO L134 CoverageAnalysis]: Checked inductivity of 2668 backedges. 1104 proven. 552 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2020-07-21 01:48:27,965 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:48:29,521 INFO L134 CoverageAnalysis]: Checked inductivity of 2668 backedges. 1104 proven. 552 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2020-07-21 01:48:29,521 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [385409175] [2020-07-21 01:48:29,521 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:48:29,522 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50] total 74 [2020-07-21 01:48:29,522 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1009878765] [2020-07-21 01:48:29,522 INFO L459 AbstractCegarLoop]: Interpolant automaton has 74 states [2020-07-21 01:48:29,522 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:48:29,523 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2020-07-21 01:48:29,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1273, Invalid=4129, Unknown=0, NotChecked=0, Total=5402 [2020-07-21 01:48:29,525 INFO L87 Difference]: Start difference. First operand 206 states and 220 transitions. Second operand 74 states. [2020-07-21 01:48:31,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:48:31,458 INFO L93 Difference]: Finished difference Result 407 states and 493 transitions. [2020-07-21 01:48:31,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-07-21 01:48:31,459 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 247 [2020-07-21 01:48:31,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:48:31,461 INFO L225 Difference]: With dead ends: 407 [2020-07-21 01:48:31,461 INFO L226 Difference]: Without dead ends: 304 [2020-07-21 01:48:31,462 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 517 GetRequests, 397 SyntacticMatches, 24 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2461 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=2497, Invalid=7009, Unknown=0, NotChecked=0, Total=9506 [2020-07-21 01:48:31,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 304 states. [2020-07-21 01:48:31,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 304 to 208. [2020-07-21 01:48:31,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 208 states. [2020-07-21 01:48:31,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 222 transitions. [2020-07-21 01:48:31,475 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 222 transitions. Word has length 247 [2020-07-21 01:48:31,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:48:31,475 INFO L479 AbstractCegarLoop]: Abstraction has 208 states and 222 transitions. [2020-07-21 01:48:31,476 INFO L480 AbstractCegarLoop]: Interpolant automaton has 74 states. [2020-07-21 01:48:31,476 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 222 transitions. [2020-07-21 01:48:31,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 250 [2020-07-21 01:48:31,477 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:48:31,478 INFO L422 BasicCegarLoop]: trace histogram [25, 24, 24, 24, 24, 23, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:48:31,690 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:31,691 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:48:31,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:48:31,691 INFO L82 PathProgramCache]: Analyzing trace with hash -1941512130, now seen corresponding path program 35 times [2020-07-21 01:48:31,691 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:48:31,692 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [904555283] [2020-07-21 01:48:31,692 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 [2020-07-21 01:48:31,814 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:48:31,814 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:48:31,818 INFO L263 TraceCheckSpWp]: Trace formula consists of 674 conjuncts, 51 conjunts are in the unsatisfiable core [2020-07-21 01:48:31,822 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:48:32,261 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 01:48:32,333 INFO L134 CoverageAnalysis]: Checked inductivity of 2716 backedges. 646 proven. 1058 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2020-07-21 01:48:32,333 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:48:32,372 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:48:33,227 INFO L134 CoverageAnalysis]: Checked inductivity of 2716 backedges. 646 proven. 1058 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2020-07-21 01:48:33,227 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [904555283] [2020-07-21 01:48:33,228 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:48:33,228 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 30 [2020-07-21 01:48:33,228 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [994353975] [2020-07-21 01:48:33,228 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-07-21 01:48:33,229 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:48:33,229 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-07-21 01:48:33,229 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=382, Invalid=488, Unknown=0, NotChecked=0, Total=870 [2020-07-21 01:48:33,229 INFO L87 Difference]: Start difference. First operand 208 states and 222 transitions. Second operand 30 states. [2020-07-21 01:48:33,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:48:33,572 INFO L93 Difference]: Finished difference Result 227 states and 243 transitions. [2020-07-21 01:48:33,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-07-21 01:48:33,573 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 249 [2020-07-21 01:48:33,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:48:33,575 INFO L225 Difference]: With dead ends: 227 [2020-07-21 01:48:33,575 INFO L226 Difference]: Without dead ends: 225 [2020-07-21 01:48:33,575 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 498 GetRequests, 421 SyntacticMatches, 48 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 743 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=386, Invalid=544, Unknown=0, NotChecked=0, Total=930 [2020-07-21 01:48:33,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2020-07-21 01:48:33,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 220. [2020-07-21 01:48:33,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 220 states. [2020-07-21 01:48:33,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 235 transitions. [2020-07-21 01:48:33,586 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 235 transitions. Word has length 249 [2020-07-21 01:48:33,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:48:33,587 INFO L479 AbstractCegarLoop]: Abstraction has 220 states and 235 transitions. [2020-07-21 01:48:33,587 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-07-21 01:48:33,587 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 235 transitions. [2020-07-21 01:48:33,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 266 [2020-07-21 01:48:33,589 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:48:33,589 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 26, 25, 25, 25, 25, 25, 25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:48:33,803 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:33,804 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:48:33,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:48:33,805 INFO L82 PathProgramCache]: Analyzing trace with hash -712391136, now seen corresponding path program 36 times [2020-07-21 01:48:33,805 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:48:33,805 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [399267024] [2020-07-21 01:48:33,805 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 [2020-07-21 01:48:33,920 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:48:33,921 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:48:33,924 INFO L263 TraceCheckSpWp]: Trace formula consists of 708 conjuncts, 52 conjunts are in the unsatisfiable core [2020-07-21 01:48:33,926 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:48:35,362 INFO L134 CoverageAnalysis]: Checked inductivity of 3100 backedges. 1392 proven. 600 refuted. 0 times theorem prover too weak. 1108 trivial. 0 not checked. [2020-07-21 01:48:35,362 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:48:37,044 INFO L134 CoverageAnalysis]: Checked inductivity of 3100 backedges. 1298 proven. 600 refuted. 0 times theorem prover too weak. 1202 trivial. 0 not checked. [2020-07-21 01:48:37,044 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [399267024] [2020-07-21 01:48:37,044 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:48:37,045 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52] total 77 [2020-07-21 01:48:37,045 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1297655242] [2020-07-21 01:48:37,045 INFO L459 AbstractCegarLoop]: Interpolant automaton has 77 states [2020-07-21 01:48:37,045 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:48:37,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2020-07-21 01:48:37,046 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1376, Invalid=4476, Unknown=0, NotChecked=0, Total=5852 [2020-07-21 01:48:37,046 INFO L87 Difference]: Start difference. First operand 220 states and 235 transitions. Second operand 77 states. [2020-07-21 01:48:39,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:48:39,047 INFO L93 Difference]: Finished difference Result 435 states and 525 transitions. [2020-07-21 01:48:39,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-07-21 01:48:39,047 INFO L78 Accepts]: Start accepts. Automaton has 77 states. Word has length 265 [2020-07-21 01:48:39,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:48:39,049 INFO L225 Difference]: With dead ends: 435 [2020-07-21 01:48:39,049 INFO L226 Difference]: Without dead ends: 322 [2020-07-21 01:48:39,051 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 554 GetRequests, 429 SyntacticMatches, 25 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2676 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=2701, Invalid=7601, Unknown=0, NotChecked=0, Total=10302 [2020-07-21 01:48:39,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 322 states. [2020-07-21 01:48:39,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 322 to 222. [2020-07-21 01:48:39,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 222 states. [2020-07-21 01:48:39,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 237 transitions. [2020-07-21 01:48:39,063 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 237 transitions. Word has length 265 [2020-07-21 01:48:39,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:48:39,064 INFO L479 AbstractCegarLoop]: Abstraction has 222 states and 237 transitions. [2020-07-21 01:48:39,064 INFO L480 AbstractCegarLoop]: Interpolant automaton has 77 states. [2020-07-21 01:48:39,064 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 237 transitions. [2020-07-21 01:48:39,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 268 [2020-07-21 01:48:39,066 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:48:39,066 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 26, 26, 25, 25, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:48:39,279 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:39,280 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:48:39,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:48:39,281 INFO L82 PathProgramCache]: Analyzing trace with hash -993908027, now seen corresponding path program 37 times [2020-07-21 01:48:39,281 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:48:39,281 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2006926801] [2020-07-21 01:48:39,281 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 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 [2020-07-21 01:48:39,398 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:48:39,398 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:48:39,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 718 conjuncts, 54 conjunts are in the unsatisfiable core [2020-07-21 01:48:39,406 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:48:40,975 INFO L134 CoverageAnalysis]: Checked inductivity of 3150 backedges. 1300 proven. 650 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2020-07-21 01:48:40,975 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:48:42,807 INFO L134 CoverageAnalysis]: Checked inductivity of 3150 backedges. 1300 proven. 650 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2020-07-21 01:48:42,807 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2006926801] [2020-07-21 01:48:42,808 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:48:42,808 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54] total 80 [2020-07-21 01:48:42,808 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2002520382] [2020-07-21 01:48:42,808 INFO L459 AbstractCegarLoop]: Interpolant automaton has 80 states [2020-07-21 01:48:42,808 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:48:42,809 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2020-07-21 01:48:42,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1483, Invalid=4837, Unknown=0, NotChecked=0, Total=6320 [2020-07-21 01:48:42,809 INFO L87 Difference]: Start difference. First operand 222 states and 237 transitions. Second operand 80 states. [2020-07-21 01:48:44,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:48:44,975 INFO L93 Difference]: Finished difference Result 439 states and 532 transitions. [2020-07-21 01:48:44,976 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-07-21 01:48:44,976 INFO L78 Accepts]: Start accepts. Automaton has 80 states. Word has length 267 [2020-07-21 01:48:44,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:48:44,977 INFO L225 Difference]: With dead ends: 439 [2020-07-21 01:48:44,977 INFO L226 Difference]: Without dead ends: 328 [2020-07-21 01:48:44,978 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 559 GetRequests, 429 SyntacticMatches, 26 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2900 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=2913, Invalid=8217, Unknown=0, NotChecked=0, Total=11130 [2020-07-21 01:48:44,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 328 states. [2020-07-21 01:48:44,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 328 to 224. [2020-07-21 01:48:44,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 224 states. [2020-07-21 01:48:44,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 239 transitions. [2020-07-21 01:48:44,991 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 239 transitions. Word has length 267 [2020-07-21 01:48:44,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:48:44,991 INFO L479 AbstractCegarLoop]: Abstraction has 224 states and 239 transitions. [2020-07-21 01:48:44,991 INFO L480 AbstractCegarLoop]: Interpolant automaton has 80 states. [2020-07-21 01:48:44,992 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 239 transitions. [2020-07-21 01:48:44,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 270 [2020-07-21 01:48:44,994 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:48:44,994 INFO L422 BasicCegarLoop]: trace histogram [27, 26, 26, 26, 26, 25, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:48:45,206 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:45,207 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:48:45,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:48:45,208 INFO L82 PathProgramCache]: Analyzing trace with hash -948700630, now seen corresponding path program 38 times [2020-07-21 01:48:45,208 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:48:45,209 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1131835523] [2020-07-21 01:48:45,209 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 [2020-07-21 01:48:45,332 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:48:45,332 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:48:45,335 INFO L263 TraceCheckSpWp]: Trace formula consists of 728 conjuncts, 55 conjunts are in the unsatisfiable core [2020-07-21 01:48:45,339 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:48:45,934 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 01:48:46,089 INFO L134 CoverageAnalysis]: Checked inductivity of 3202 backedges. 752 proven. 1250 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2020-07-21 01:48:46,090 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:48:46,146 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:48:47,189 INFO L134 CoverageAnalysis]: Checked inductivity of 3202 backedges. 752 proven. 1250 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2020-07-21 01:48:47,189 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1131835523] [2020-07-21 01:48:47,189 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:48:47,190 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31] total 32 [2020-07-21 01:48:47,190 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2030066817] [2020-07-21 01:48:47,190 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-07-21 01:48:47,191 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:48:47,191 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-07-21 01:48:47,191 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=439, Invalid=553, Unknown=0, NotChecked=0, Total=992 [2020-07-21 01:48:47,191 INFO L87 Difference]: Start difference. First operand 224 states and 239 transitions. Second operand 32 states. [2020-07-21 01:48:47,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:48:47,591 INFO L93 Difference]: Finished difference Result 243 states and 260 transitions. [2020-07-21 01:48:47,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-07-21 01:48:47,594 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 269 [2020-07-21 01:48:47,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:48:47,596 INFO L225 Difference]: With dead ends: 243 [2020-07-21 01:48:47,597 INFO L226 Difference]: Without dead ends: 241 [2020-07-21 01:48:47,597 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 538 GetRequests, 455 SyntacticMatches, 52 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 857 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=443, Invalid=613, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 01:48:47,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 241 states. [2020-07-21 01:48:47,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 241 to 236. [2020-07-21 01:48:47,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 236 states. [2020-07-21 01:48:47,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 236 states to 236 states and 252 transitions. [2020-07-21 01:48:47,610 INFO L78 Accepts]: Start accepts. Automaton has 236 states and 252 transitions. Word has length 269 [2020-07-21 01:48:47,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:48:47,611 INFO L479 AbstractCegarLoop]: Abstraction has 236 states and 252 transitions. [2020-07-21 01:48:47,611 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-07-21 01:48:47,611 INFO L276 IsEmpty]: Start isEmpty. Operand 236 states and 252 transitions. [2020-07-21 01:48:47,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 286 [2020-07-21 01:48:47,613 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:48:47,613 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 28, 27, 27, 27, 27, 27, 27, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:48:47,826 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:47,827 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:48:47,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:48:47,828 INFO L82 PathProgramCache]: Analyzing trace with hash 167610380, now seen corresponding path program 39 times [2020-07-21 01:48:47,828 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:48:47,828 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1420863701] [2020-07-21 01:48:47,828 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 [2020-07-21 01:48:47,957 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:48:47,958 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:48:47,962 INFO L263 TraceCheckSpWp]: Trace formula consists of 762 conjuncts, 56 conjunts are in the unsatisfiable core [2020-07-21 01:48:47,966 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:48:49,779 INFO L134 CoverageAnalysis]: Checked inductivity of 3618 backedges. 1612 proven. 702 refuted. 0 times theorem prover too weak. 1304 trivial. 0 not checked. [2020-07-21 01:48:49,779 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:48:51,869 INFO L134 CoverageAnalysis]: Checked inductivity of 3618 backedges. 1510 proven. 702 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2020-07-21 01:48:51,870 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1420863701] [2020-07-21 01:48:51,870 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:48:51,871 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56] total 83 [2020-07-21 01:48:51,871 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [51988258] [2020-07-21 01:48:51,872 INFO L459 AbstractCegarLoop]: Interpolant automaton has 83 states [2020-07-21 01:48:51,872 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:48:51,872 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2020-07-21 01:48:51,873 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1594, Invalid=5212, Unknown=0, NotChecked=0, Total=6806 [2020-07-21 01:48:51,873 INFO L87 Difference]: Start difference. First operand 236 states and 252 transitions. Second operand 83 states. [2020-07-21 01:48:54,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:48:54,241 INFO L93 Difference]: Finished difference Result 467 states and 564 transitions. [2020-07-21 01:48:54,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2020-07-21 01:48:54,241 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 285 [2020-07-21 01:48:54,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:48:54,243 INFO L225 Difference]: With dead ends: 467 [2020-07-21 01:48:54,243 INFO L226 Difference]: Without dead ends: 346 [2020-07-21 01:48:54,245 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 596 GetRequests, 461 SyntacticMatches, 27 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3133 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=3133, Invalid=8857, Unknown=0, NotChecked=0, Total=11990 [2020-07-21 01:48:54,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 346 states. [2020-07-21 01:48:54,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 346 to 238. [2020-07-21 01:48:54,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 238 states. [2020-07-21 01:48:54,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 254 transitions. [2020-07-21 01:48:54,260 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 254 transitions. Word has length 285 [2020-07-21 01:48:54,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:48:54,260 INFO L479 AbstractCegarLoop]: Abstraction has 238 states and 254 transitions. [2020-07-21 01:48:54,260 INFO L480 AbstractCegarLoop]: Interpolant automaton has 83 states. [2020-07-21 01:48:54,261 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 254 transitions. [2020-07-21 01:48:54,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 288 [2020-07-21 01:48:54,263 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:48:54,263 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 28, 28, 27, 27, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:48:54,477 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:54,478 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:48:54,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:48:54,479 INFO L82 PathProgramCache]: Analyzing trace with hash 196225073, now seen corresponding path program 40 times [2020-07-21 01:48:54,479 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:48:54,479 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [550097227] [2020-07-21 01:48:54,479 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 [2020-07-21 01:48:54,601 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:48:54,601 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:48:54,604 INFO L263 TraceCheckSpWp]: Trace formula consists of 772 conjuncts, 58 conjunts are in the unsatisfiable core [2020-07-21 01:48:54,608 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:48:56,446 INFO L134 CoverageAnalysis]: Checked inductivity of 3672 backedges. 1512 proven. 756 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2020-07-21 01:48:56,446 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:48:58,649 INFO L134 CoverageAnalysis]: Checked inductivity of 3672 backedges. 1512 proven. 756 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2020-07-21 01:48:58,650 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [550097227] [2020-07-21 01:48:58,650 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:48:58,650 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58] total 86 [2020-07-21 01:48:58,650 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1334521350] [2020-07-21 01:48:58,651 INFO L459 AbstractCegarLoop]: Interpolant automaton has 86 states [2020-07-21 01:48:58,651 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:48:58,652 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2020-07-21 01:48:58,653 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1709, Invalid=5601, Unknown=0, NotChecked=0, Total=7310 [2020-07-21 01:48:58,653 INFO L87 Difference]: Start difference. First operand 238 states and 254 transitions. Second operand 86 states. [2020-07-21 01:49:01,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:49:01,209 INFO L93 Difference]: Finished difference Result 471 states and 571 transitions. [2020-07-21 01:49:01,209 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2020-07-21 01:49:01,209 INFO L78 Accepts]: Start accepts. Automaton has 86 states. Word has length 287 [2020-07-21 01:49:01,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:49:01,211 INFO L225 Difference]: With dead ends: 471 [2020-07-21 01:49:01,211 INFO L226 Difference]: Without dead ends: 352 [2020-07-21 01:49:01,213 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 601 GetRequests, 461 SyntacticMatches, 28 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3375 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=3361, Invalid=9521, Unknown=0, NotChecked=0, Total=12882 [2020-07-21 01:49:01,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 352 states. [2020-07-21 01:49:01,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 352 to 240. [2020-07-21 01:49:01,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 240 states. [2020-07-21 01:49:01,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 240 states to 240 states and 256 transitions. [2020-07-21 01:49:01,227 INFO L78 Accepts]: Start accepts. Automaton has 240 states and 256 transitions. Word has length 287 [2020-07-21 01:49:01,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:49:01,228 INFO L479 AbstractCegarLoop]: Abstraction has 240 states and 256 transitions. [2020-07-21 01:49:01,228 INFO L480 AbstractCegarLoop]: Interpolant automaton has 86 states. [2020-07-21 01:49:01,228 INFO L276 IsEmpty]: Start isEmpty. Operand 240 states and 256 transitions. [2020-07-21 01:49:01,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 290 [2020-07-21 01:49:01,230 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:49:01,230 INFO L422 BasicCegarLoop]: trace histogram [29, 28, 28, 28, 28, 27, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:49:01,444 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:49:01,445 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:49:01,445 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:49:01,445 INFO L82 PathProgramCache]: Analyzing trace with hash 1925141270, now seen corresponding path program 41 times [2020-07-21 01:49:01,445 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:49:01,446 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [608316186] [2020-07-21 01:49:01,446 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 [2020-07-21 01:49:01,573 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:49:01,573 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:49:01,576 INFO L263 TraceCheckSpWp]: Trace formula consists of 782 conjuncts, 59 conjunts are in the unsatisfiable core [2020-07-21 01:49:01,579 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:49:02,179 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 01:49:02,268 INFO L134 CoverageAnalysis]: Checked inductivity of 3728 backedges. 866 proven. 1458 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2020-07-21 01:49:02,269 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:49:02,314 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:49:03,728 INFO L134 CoverageAnalysis]: Checked inductivity of 3728 backedges. 866 proven. 1458 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2020-07-21 01:49:03,729 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [608316186] [2020-07-21 01:49:03,729 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:49:03,729 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33] total 34 [2020-07-21 01:49:03,732 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2019688850] [2020-07-21 01:49:03,733 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-07-21 01:49:03,733 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:49:03,734 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-07-21 01:49:03,734 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=500, Invalid=622, Unknown=0, NotChecked=0, Total=1122 [2020-07-21 01:49:03,734 INFO L87 Difference]: Start difference. First operand 240 states and 256 transitions. Second operand 34 states. [2020-07-21 01:49:04,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:49:04,186 INFO L93 Difference]: Finished difference Result 259 states and 277 transitions. [2020-07-21 01:49:04,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-21 01:49:04,187 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 289 [2020-07-21 01:49:04,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:49:04,189 INFO L225 Difference]: With dead ends: 259 [2020-07-21 01:49:04,189 INFO L226 Difference]: Without dead ends: 257 [2020-07-21 01:49:04,190 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 489 SyntacticMatches, 56 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 979 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=504, Invalid=686, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 01:49:04,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2020-07-21 01:49:04,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 252. [2020-07-21 01:49:04,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 252 states. [2020-07-21 01:49:04,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 269 transitions. [2020-07-21 01:49:04,205 INFO L78 Accepts]: Start accepts. Automaton has 252 states and 269 transitions. Word has length 289 [2020-07-21 01:49:04,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:49:04,205 INFO L479 AbstractCegarLoop]: Abstraction has 252 states and 269 transitions. [2020-07-21 01:49:04,205 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-07-21 01:49:04,206 INFO L276 IsEmpty]: Start isEmpty. Operand 252 states and 269 transitions. [2020-07-21 01:49:04,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 306 [2020-07-21 01:49:04,208 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:49:04,208 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 30, 29, 29, 29, 29, 29, 29, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:49:04,422 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:49:04,423 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:49:04,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:49:04,424 INFO L82 PathProgramCache]: Analyzing trace with hash -2144237320, now seen corresponding path program 42 times [2020-07-21 01:49:04,424 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:49:04,424 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [562116006] [2020-07-21 01:49:04,424 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 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 [2020-07-21 01:49:04,558 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:49:04,558 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:49:04,563 INFO L263 TraceCheckSpWp]: Trace formula consists of 816 conjuncts, 60 conjunts are in the unsatisfiable core [2020-07-21 01:49:04,567 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:49:06,585 INFO L134 CoverageAnalysis]: Checked inductivity of 4176 backedges. 1848 proven. 812 refuted. 0 times theorem prover too weak. 1516 trivial. 0 not checked. [2020-07-21 01:49:06,585 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:49:08,967 INFO L134 CoverageAnalysis]: Checked inductivity of 4176 backedges. 1738 proven. 812 refuted. 0 times theorem prover too weak. 1626 trivial. 0 not checked. [2020-07-21 01:49:08,967 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [562116006] [2020-07-21 01:49:08,967 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:49:08,967 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60] total 89 [2020-07-21 01:49:08,967 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [690952455] [2020-07-21 01:49:08,968 INFO L459 AbstractCegarLoop]: Interpolant automaton has 89 states [2020-07-21 01:49:08,968 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:49:08,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2020-07-21 01:49:08,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1828, Invalid=6004, Unknown=0, NotChecked=0, Total=7832 [2020-07-21 01:49:08,969 INFO L87 Difference]: Start difference. First operand 252 states and 269 transitions. Second operand 89 states. [2020-07-21 01:49:11,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:49:11,769 INFO L93 Difference]: Finished difference Result 499 states and 603 transitions. [2020-07-21 01:49:11,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2020-07-21 01:49:11,770 INFO L78 Accepts]: Start accepts. Automaton has 89 states. Word has length 305 [2020-07-21 01:49:11,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:49:11,772 INFO L225 Difference]: With dead ends: 499 [2020-07-21 01:49:11,772 INFO L226 Difference]: Without dead ends: 370 [2020-07-21 01:49:11,773 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 638 GetRequests, 493 SyntacticMatches, 29 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3626 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=3597, Invalid=10209, Unknown=0, NotChecked=0, Total=13806 [2020-07-21 01:49:11,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 370 states. [2020-07-21 01:49:11,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 370 to 254. [2020-07-21 01:49:11,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 254 states. [2020-07-21 01:49:11,786 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 254 states to 254 states and 271 transitions. [2020-07-21 01:49:11,787 INFO L78 Accepts]: Start accepts. Automaton has 254 states and 271 transitions. Word has length 305 [2020-07-21 01:49:11,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:49:11,787 INFO L479 AbstractCegarLoop]: Abstraction has 254 states and 271 transitions. [2020-07-21 01:49:11,787 INFO L480 AbstractCegarLoop]: Interpolant automaton has 89 states. [2020-07-21 01:49:11,787 INFO L276 IsEmpty]: Start isEmpty. Operand 254 states and 271 transitions. [2020-07-21 01:49:11,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 308 [2020-07-21 01:49:11,789 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:49:11,790 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 30, 30, 29, 29, 29, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:49:12,002 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:49:12,003 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:49:12,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:49:12,004 INFO L82 PathProgramCache]: Analyzing trace with hash 191997085, now seen corresponding path program 43 times [2020-07-21 01:49:12,004 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:49:12,004 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1653775399] [2020-07-21 01:49:12,004 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 [2020-07-21 01:49:12,137 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:49:12,137 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:49:12,141 INFO L263 TraceCheckSpWp]: Trace formula consists of 826 conjuncts, 62 conjunts are in the unsatisfiable core [2020-07-21 01:49:12,144 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:49:14,298 INFO L134 CoverageAnalysis]: Checked inductivity of 4234 backedges. 1740 proven. 870 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2020-07-21 01:49:14,299 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:49:16,922 INFO L134 CoverageAnalysis]: Checked inductivity of 4234 backedges. 1740 proven. 870 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2020-07-21 01:49:16,922 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1653775399] [2020-07-21 01:49:16,923 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:49:16,923 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62] total 92 [2020-07-21 01:49:16,923 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2135721821] [2020-07-21 01:49:16,923 INFO L459 AbstractCegarLoop]: Interpolant automaton has 92 states [2020-07-21 01:49:16,924 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:49:16,924 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2020-07-21 01:49:16,925 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1951, Invalid=6421, Unknown=0, NotChecked=0, Total=8372 [2020-07-21 01:49:16,925 INFO L87 Difference]: Start difference. First operand 254 states and 271 transitions. Second operand 92 states. [2020-07-21 01:49:19,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:49:19,861 INFO L93 Difference]: Finished difference Result 503 states and 610 transitions. [2020-07-21 01:49:19,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2020-07-21 01:49:19,861 INFO L78 Accepts]: Start accepts. Automaton has 92 states. Word has length 307 [2020-07-21 01:49:19,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:49:19,863 INFO L225 Difference]: With dead ends: 503 [2020-07-21 01:49:19,863 INFO L226 Difference]: Without dead ends: 376 [2020-07-21 01:49:19,865 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 643 GetRequests, 493 SyntacticMatches, 30 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3886 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=3841, Invalid=10921, Unknown=0, NotChecked=0, Total=14762 [2020-07-21 01:49:19,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 376 states. [2020-07-21 01:49:19,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 376 to 256. [2020-07-21 01:49:19,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 256 states. [2020-07-21 01:49:19,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 273 transitions. [2020-07-21 01:49:19,879 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 273 transitions. Word has length 307 [2020-07-21 01:49:19,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:49:19,879 INFO L479 AbstractCegarLoop]: Abstraction has 256 states and 273 transitions. [2020-07-21 01:49:19,879 INFO L480 AbstractCegarLoop]: Interpolant automaton has 92 states. [2020-07-21 01:49:19,879 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 273 transitions. [2020-07-21 01:49:19,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 310 [2020-07-21 01:49:19,882 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:49:19,882 INFO L422 BasicCegarLoop]: trace histogram [31, 30, 30, 30, 30, 29, 29, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:49:20,096 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:49:20,097 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:49:20,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:49:20,097 INFO L82 PathProgramCache]: Analyzing trace with hash -954635518, now seen corresponding path program 44 times [2020-07-21 01:49:20,097 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:49:20,097 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [642767498] [2020-07-21 01:49:20,098 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 [2020-07-21 01:49:20,231 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:49:20,231 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:49:20,234 INFO L263 TraceCheckSpWp]: Trace formula consists of 836 conjuncts, 63 conjunts are in the unsatisfiable core [2020-07-21 01:49:20,237 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:49:20,952 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 01:49:21,073 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 988 proven. 1682 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2020-07-21 01:49:21,073 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:49:21,122 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:49:22,546 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 988 proven. 1682 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2020-07-21 01:49:22,546 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [642767498] [2020-07-21 01:49:22,547 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:49:22,547 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 36 [2020-07-21 01:49:22,547 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1431710522] [2020-07-21 01:49:22,547 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-21 01:49:22,548 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:49:22,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-21 01:49:22,548 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=565, Invalid=695, Unknown=0, NotChecked=0, Total=1260 [2020-07-21 01:49:22,548 INFO L87 Difference]: Start difference. First operand 256 states and 273 transitions. Second operand 36 states. [2020-07-21 01:49:23,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:49:23,049 INFO L93 Difference]: Finished difference Result 275 states and 294 transitions. [2020-07-21 01:49:23,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-07-21 01:49:23,050 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 309 [2020-07-21 01:49:23,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:49:23,051 INFO L225 Difference]: With dead ends: 275 [2020-07-21 01:49:23,052 INFO L226 Difference]: Without dead ends: 273 [2020-07-21 01:49:23,052 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 618 GetRequests, 523 SyntacticMatches, 60 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1109 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=569, Invalid=763, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 01:49:23,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 273 states. [2020-07-21 01:49:23,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 273 to 268. [2020-07-21 01:49:23,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 268 states. [2020-07-21 01:49:23,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 268 states to 268 states and 286 transitions. [2020-07-21 01:49:23,066 INFO L78 Accepts]: Start accepts. Automaton has 268 states and 286 transitions. Word has length 309 [2020-07-21 01:49:23,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:49:23,067 INFO L479 AbstractCegarLoop]: Abstraction has 268 states and 286 transitions. [2020-07-21 01:49:23,067 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-21 01:49:23,067 INFO L276 IsEmpty]: Start isEmpty. Operand 268 states and 286 transitions. [2020-07-21 01:49:23,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 326 [2020-07-21 01:49:23,070 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:49:23,070 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 32, 31, 31, 31, 31, 31, 31, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:49:23,286 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:49:23,287 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:49:23,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:49:23,287 INFO L82 PathProgramCache]: Analyzing trace with hash -2146023196, now seen corresponding path program 45 times [2020-07-21 01:49:23,287 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:49:23,287 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [863218634] [2020-07-21 01:49:23,287 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 [2020-07-21 01:49:23,442 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:49:23,442 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:49:23,446 INFO L263 TraceCheckSpWp]: Trace formula consists of 870 conjuncts, 64 conjunts are in the unsatisfiable core [2020-07-21 01:49:23,449 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:49:25,797 INFO L134 CoverageAnalysis]: Checked inductivity of 4774 backedges. 2100 proven. 930 refuted. 0 times theorem prover too weak. 1744 trivial. 0 not checked. [2020-07-21 01:49:25,797 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:49:28,582 INFO L134 CoverageAnalysis]: Checked inductivity of 4774 backedges. 1982 proven. 930 refuted. 0 times theorem prover too weak. 1862 trivial. 0 not checked. [2020-07-21 01:49:28,583 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [863218634] [2020-07-21 01:49:28,583 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:49:28,583 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64] total 95 [2020-07-21 01:49:28,583 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [167186421] [2020-07-21 01:49:28,584 INFO L459 AbstractCegarLoop]: Interpolant automaton has 95 states [2020-07-21 01:49:28,584 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:49:28,585 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2020-07-21 01:49:28,586 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2078, Invalid=6852, Unknown=0, NotChecked=0, Total=8930 [2020-07-21 01:49:28,586 INFO L87 Difference]: Start difference. First operand 268 states and 286 transitions. Second operand 95 states. [2020-07-21 01:49:32,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:49:32,935 INFO L93 Difference]: Finished difference Result 531 states and 642 transitions. [2020-07-21 01:49:32,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2020-07-21 01:49:32,935 INFO L78 Accepts]: Start accepts. Automaton has 95 states. Word has length 325 [2020-07-21 01:49:32,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:49:32,939 INFO L225 Difference]: With dead ends: 531 [2020-07-21 01:49:32,939 INFO L226 Difference]: Without dead ends: 394 [2020-07-21 01:49:32,945 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 680 GetRequests, 525 SyntacticMatches, 31 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4155 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=4093, Invalid=11657, Unknown=0, NotChecked=0, Total=15750 [2020-07-21 01:49:32,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 394 states. [2020-07-21 01:49:32,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 394 to 270. [2020-07-21 01:49:32,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 270 states. [2020-07-21 01:49:32,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 288 transitions. [2020-07-21 01:49:32,971 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 288 transitions. Word has length 325 [2020-07-21 01:49:32,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:49:32,971 INFO L479 AbstractCegarLoop]: Abstraction has 270 states and 288 transitions. [2020-07-21 01:49:32,972 INFO L480 AbstractCegarLoop]: Interpolant automaton has 95 states. [2020-07-21 01:49:32,972 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 288 transitions. [2020-07-21 01:49:32,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 328 [2020-07-21 01:49:32,976 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:49:32,977 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 32, 32, 31, 31, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:49:33,191 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:49:33,192 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:49:33,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:49:33,193 INFO L82 PathProgramCache]: Analyzing trace with hash 735125513, now seen corresponding path program 46 times [2020-07-21 01:49:33,193 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:49:33,193 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1227672223] [2020-07-21 01:49:33,193 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 [2020-07-21 01:49:33,417 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:49:33,417 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:49:33,424 INFO L263 TraceCheckSpWp]: Trace formula consists of 880 conjuncts, 66 conjunts are in the unsatisfiable core [2020-07-21 01:49:33,431 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:49:36,763 INFO L134 CoverageAnalysis]: Checked inductivity of 4836 backedges. 1984 proven. 992 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-21 01:49:36,764 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:49:39,834 INFO L134 CoverageAnalysis]: Checked inductivity of 4836 backedges. 1984 proven. 992 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-21 01:49:39,834 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1227672223] [2020-07-21 01:49:39,834 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:49:39,834 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 66] total 98 [2020-07-21 01:49:39,835 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1308025440] [2020-07-21 01:49:39,835 INFO L459 AbstractCegarLoop]: Interpolant automaton has 98 states [2020-07-21 01:49:39,835 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:49:39,836 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2020-07-21 01:49:39,836 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2209, Invalid=7297, Unknown=0, NotChecked=0, Total=9506 [2020-07-21 01:49:39,836 INFO L87 Difference]: Start difference. First operand 270 states and 288 transitions. Second operand 98 states. [2020-07-21 01:49:43,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:49:43,250 INFO L93 Difference]: Finished difference Result 535 states and 649 transitions. [2020-07-21 01:49:43,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2020-07-21 01:49:43,250 INFO L78 Accepts]: Start accepts. Automaton has 98 states. Word has length 327 [2020-07-21 01:49:43,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:49:43,252 INFO L225 Difference]: With dead ends: 535 [2020-07-21 01:49:43,252 INFO L226 Difference]: Without dead ends: 400 [2020-07-21 01:49:43,254 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 685 GetRequests, 525 SyntacticMatches, 32 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4433 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=4353, Invalid=12417, Unknown=0, NotChecked=0, Total=16770 [2020-07-21 01:49:43,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 400 states. [2020-07-21 01:49:43,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 400 to 272. [2020-07-21 01:49:43,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 272 states. [2020-07-21 01:49:43,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 272 states to 272 states and 290 transitions. [2020-07-21 01:49:43,270 INFO L78 Accepts]: Start accepts. Automaton has 272 states and 290 transitions. Word has length 327 [2020-07-21 01:49:43,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:49:43,270 INFO L479 AbstractCegarLoop]: Abstraction has 272 states and 290 transitions. [2020-07-21 01:49:43,270 INFO L480 AbstractCegarLoop]: Interpolant automaton has 98 states. [2020-07-21 01:49:43,271 INFO L276 IsEmpty]: Start isEmpty. Operand 272 states and 290 transitions. [2020-07-21 01:49:43,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 330 [2020-07-21 01:49:43,273 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:49:43,274 INFO L422 BasicCegarLoop]: trace histogram [33, 32, 32, 32, 32, 31, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:49:43,487 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:49:43,488 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:49:43,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:49:43,489 INFO L82 PathProgramCache]: Analyzing trace with hash -734871058, now seen corresponding path program 47 times [2020-07-21 01:49:43,489 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:49:43,489 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [99341515] [2020-07-21 01:49:43,490 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 [2020-07-21 01:49:43,636 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:49:43,636 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:49:43,639 INFO L263 TraceCheckSpWp]: Trace formula consists of 890 conjuncts, 67 conjunts are in the unsatisfiable core [2020-07-21 01:49:43,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:49:44,503 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 01:49:44,620 INFO L134 CoverageAnalysis]: Checked inductivity of 4900 backedges. 1118 proven. 1922 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-21 01:49:44,620 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:49:44,672 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:49:46,413 INFO L134 CoverageAnalysis]: Checked inductivity of 4900 backedges. 1118 proven. 1922 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-21 01:49:46,414 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [99341515] [2020-07-21 01:49:46,414 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:49:46,414 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37] total 38 [2020-07-21 01:49:46,414 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [945479870] [2020-07-21 01:49:46,415 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-07-21 01:49:46,415 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:49:46,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-07-21 01:49:46,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=634, Invalid=772, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 01:49:46,415 INFO L87 Difference]: Start difference. First operand 272 states and 290 transitions. Second operand 38 states. [2020-07-21 01:49:46,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:49:46,929 INFO L93 Difference]: Finished difference Result 291 states and 311 transitions. [2020-07-21 01:49:46,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-07-21 01:49:46,930 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 329 [2020-07-21 01:49:46,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:49:46,932 INFO L225 Difference]: With dead ends: 291 [2020-07-21 01:49:46,932 INFO L226 Difference]: Without dead ends: 289 [2020-07-21 01:49:46,933 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 658 GetRequests, 557 SyntacticMatches, 64 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1247 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=638, Invalid=844, Unknown=0, NotChecked=0, Total=1482 [2020-07-21 01:49:46,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2020-07-21 01:49:46,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 284. [2020-07-21 01:49:46,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 284 states. [2020-07-21 01:49:46,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 284 states to 284 states and 303 transitions. [2020-07-21 01:49:46,948 INFO L78 Accepts]: Start accepts. Automaton has 284 states and 303 transitions. Word has length 329 [2020-07-21 01:49:46,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:49:46,949 INFO L479 AbstractCegarLoop]: Abstraction has 284 states and 303 transitions. [2020-07-21 01:49:46,949 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-07-21 01:49:46,949 INFO L276 IsEmpty]: Start isEmpty. Operand 284 states and 303 transitions. [2020-07-21 01:49:46,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 346 [2020-07-21 01:49:46,952 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:49:46,952 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 34, 33, 33, 33, 33, 33, 33, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:49:47,166 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:49:47,167 INFO L427 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:49:47,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:49:47,167 INFO L82 PathProgramCache]: Analyzing trace with hash -1470347312, now seen corresponding path program 48 times [2020-07-21 01:49:47,167 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:49:47,168 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [212393227] [2020-07-21 01:49:47,168 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 [2020-07-21 01:49:47,313 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:49:47,314 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:49:47,317 INFO L263 TraceCheckSpWp]: Trace formula consists of 924 conjuncts, 68 conjunts are in the unsatisfiable core [2020-07-21 01:49:47,321 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:49:50,156 INFO L134 CoverageAnalysis]: Checked inductivity of 5412 backedges. 2368 proven. 1056 refuted. 0 times theorem prover too weak. 1988 trivial. 0 not checked. [2020-07-21 01:49:50,157 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:49:53,513 INFO L134 CoverageAnalysis]: Checked inductivity of 5412 backedges. 2242 proven. 1056 refuted. 0 times theorem prover too weak. 2114 trivial. 0 not checked. [2020-07-21 01:49:53,514 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [212393227] [2020-07-21 01:49:53,514 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:49:53,514 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68] total 101 [2020-07-21 01:49:53,514 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1673107701] [2020-07-21 01:49:53,515 INFO L459 AbstractCegarLoop]: Interpolant automaton has 101 states [2020-07-21 01:49:53,515 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:49:53,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2020-07-21 01:49:53,516 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2344, Invalid=7756, Unknown=0, NotChecked=0, Total=10100 [2020-07-21 01:49:53,516 INFO L87 Difference]: Start difference. First operand 284 states and 303 transitions. Second operand 101 states. [2020-07-21 01:49:57,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:49:57,720 INFO L93 Difference]: Finished difference Result 563 states and 681 transitions. [2020-07-21 01:49:57,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2020-07-21 01:49:57,721 INFO L78 Accepts]: Start accepts. Automaton has 101 states. Word has length 345 [2020-07-21 01:49:57,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:49:57,723 INFO L225 Difference]: With dead ends: 563 [2020-07-21 01:49:57,723 INFO L226 Difference]: Without dead ends: 418 [2020-07-21 01:49:57,725 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 722 GetRequests, 557 SyntacticMatches, 33 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4720 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=4621, Invalid=13201, Unknown=0, NotChecked=0, Total=17822 [2020-07-21 01:49:57,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 418 states. [2020-07-21 01:49:57,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 418 to 286. [2020-07-21 01:49:57,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 286 states. [2020-07-21 01:49:57,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 305 transitions. [2020-07-21 01:49:57,741 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 305 transitions. Word has length 345 [2020-07-21 01:49:57,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:49:57,741 INFO L479 AbstractCegarLoop]: Abstraction has 286 states and 305 transitions. [2020-07-21 01:49:57,742 INFO L480 AbstractCegarLoop]: Interpolant automaton has 101 states. [2020-07-21 01:49:57,742 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 305 transitions. [2020-07-21 01:49:57,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 348 [2020-07-21 01:49:57,744 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:49:57,745 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 34, 34, 33, 33, 33, 33, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:49:57,957 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:49:57,958 INFO L427 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:49:57,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:49:57,959 INFO L82 PathProgramCache]: Analyzing trace with hash 2069961333, now seen corresponding path program 49 times [2020-07-21 01:49:57,959 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:49:57,959 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [706809616] [2020-07-21 01:49:57,960 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 53 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:49:58,105 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:49:58,105 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:49:58,110 INFO L263 TraceCheckSpWp]: Trace formula consists of 934 conjuncts, 70 conjunts are in the unsatisfiable core [2020-07-21 01:49:58,114 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:50:01,145 INFO L134 CoverageAnalysis]: Checked inductivity of 5478 backedges. 2244 proven. 1122 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2020-07-21 01:50:01,145 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:50:04,802 INFO L134 CoverageAnalysis]: Checked inductivity of 5478 backedges. 2244 proven. 1122 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2020-07-21 01:50:04,802 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [706809616] [2020-07-21 01:50:04,803 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:50:04,803 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 70] total 104 [2020-07-21 01:50:04,803 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1913212629] [2020-07-21 01:50:04,804 INFO L459 AbstractCegarLoop]: Interpolant automaton has 104 states [2020-07-21 01:50:04,804 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:50:04,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2020-07-21 01:50:04,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2483, Invalid=8229, Unknown=0, NotChecked=0, Total=10712 [2020-07-21 01:50:04,805 INFO L87 Difference]: Start difference. First operand 286 states and 305 transitions. Second operand 104 states. [2020-07-21 01:50:08,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:50:08,995 INFO L93 Difference]: Finished difference Result 567 states and 688 transitions. [2020-07-21 01:50:08,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2020-07-21 01:50:08,995 INFO L78 Accepts]: Start accepts. Automaton has 104 states. Word has length 347 [2020-07-21 01:50:08,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:50:08,997 INFO L225 Difference]: With dead ends: 567 [2020-07-21 01:50:08,998 INFO L226 Difference]: Without dead ends: 424 [2020-07-21 01:50:09,000 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 727 GetRequests, 557 SyntacticMatches, 34 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5016 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=4897, Invalid=14009, Unknown=0, NotChecked=0, Total=18906 [2020-07-21 01:50:09,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 424 states. [2020-07-21 01:50:09,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 424 to 288. [2020-07-21 01:50:09,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 288 states. [2020-07-21 01:50:09,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 307 transitions. [2020-07-21 01:50:09,015 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 307 transitions. Word has length 347 [2020-07-21 01:50:09,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:50:09,016 INFO L479 AbstractCegarLoop]: Abstraction has 288 states and 307 transitions. [2020-07-21 01:50:09,016 INFO L480 AbstractCegarLoop]: Interpolant automaton has 104 states. [2020-07-21 01:50:09,016 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 307 transitions. [2020-07-21 01:50:09,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 350 [2020-07-21 01:50:09,018 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:50:09,019 INFO L422 BasicCegarLoop]: trace histogram [35, 34, 34, 34, 34, 33, 33, 33, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:50:09,233 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:50:09,234 INFO L427 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:50:09,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:50:09,235 INFO L82 PathProgramCache]: Analyzing trace with hash -1602496550, now seen corresponding path program 50 times [2020-07-21 01:50:09,235 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:50:09,235 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1047251013] [2020-07-21 01:50:09,235 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 54 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:50:09,389 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:50:09,390 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:50:09,393 INFO L263 TraceCheckSpWp]: Trace formula consists of 944 conjuncts, 71 conjunts are in the unsatisfiable core [2020-07-21 01:50:09,397 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:50:10,425 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 01:50:10,552 INFO L134 CoverageAnalysis]: Checked inductivity of 5546 backedges. 1256 proven. 2178 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2020-07-21 01:50:10,552 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:50:10,614 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:50:12,731 INFO L134 CoverageAnalysis]: Checked inductivity of 5546 backedges. 1256 proven. 2178 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2020-07-21 01:50:12,732 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1047251013] [2020-07-21 01:50:12,732 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:50:12,732 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39] total 40 [2020-07-21 01:50:12,732 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [489546579] [2020-07-21 01:50:12,733 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-07-21 01:50:12,733 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:50:12,733 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-07-21 01:50:12,734 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=707, Invalid=853, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 01:50:12,734 INFO L87 Difference]: Start difference. First operand 288 states and 307 transitions. Second operand 40 states. [2020-07-21 01:50:13,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:50:13,363 INFO L93 Difference]: Finished difference Result 307 states and 328 transitions. [2020-07-21 01:50:13,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-07-21 01:50:13,364 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 349 [2020-07-21 01:50:13,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:50:13,367 INFO L225 Difference]: With dead ends: 307 [2020-07-21 01:50:13,367 INFO L226 Difference]: Without dead ends: 305 [2020-07-21 01:50:13,368 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 698 GetRequests, 591 SyntacticMatches, 68 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1393 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=711, Invalid=929, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 01:50:13,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 305 states. [2020-07-21 01:50:13,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 305 to 300. [2020-07-21 01:50:13,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 300 states. [2020-07-21 01:50:13,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 300 states to 300 states and 320 transitions. [2020-07-21 01:50:13,379 INFO L78 Accepts]: Start accepts. Automaton has 300 states and 320 transitions. Word has length 349 [2020-07-21 01:50:13,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:50:13,380 INFO L479 AbstractCegarLoop]: Abstraction has 300 states and 320 transitions. [2020-07-21 01:50:13,380 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-07-21 01:50:13,380 INFO L276 IsEmpty]: Start isEmpty. Operand 300 states and 320 transitions. [2020-07-21 01:50:13,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 366 [2020-07-21 01:50:13,382 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:50:13,383 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 36, 35, 35, 35, 35, 35, 35, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:50:13,597 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:50:13,598 INFO L427 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:50:13,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:50:13,598 INFO L82 PathProgramCache]: Analyzing trace with hash 242484668, now seen corresponding path program 51 times [2020-07-21 01:50:13,598 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:50:13,598 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1145946620] [2020-07-21 01:50:13,599 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 55 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:50:13,755 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:50:13,755 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:50:13,759 INFO L263 TraceCheckSpWp]: Trace formula consists of 978 conjuncts, 72 conjunts are in the unsatisfiable core [2020-07-21 01:50:13,764 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:50:17,108 INFO L134 CoverageAnalysis]: Checked inductivity of 6090 backedges. 2652 proven. 1190 refuted. 0 times theorem prover too weak. 2248 trivial. 0 not checked. [2020-07-21 01:50:17,108 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:50:21,128 INFO L134 CoverageAnalysis]: Checked inductivity of 6090 backedges. 2518 proven. 1190 refuted. 0 times theorem prover too weak. 2382 trivial. 0 not checked. [2020-07-21 01:50:21,128 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1145946620] [2020-07-21 01:50:21,128 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:50:21,128 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72] total 107 [2020-07-21 01:50:21,128 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [607894989] [2020-07-21 01:50:21,129 INFO L459 AbstractCegarLoop]: Interpolant automaton has 107 states [2020-07-21 01:50:21,129 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:50:21,130 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2020-07-21 01:50:21,131 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2626, Invalid=8716, Unknown=0, NotChecked=0, Total=11342 [2020-07-21 01:50:21,131 INFO L87 Difference]: Start difference. First operand 300 states and 320 transitions. Second operand 107 states. [2020-07-21 01:50:25,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:50:25,802 INFO L93 Difference]: Finished difference Result 595 states and 720 transitions. [2020-07-21 01:50:25,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2020-07-21 01:50:25,802 INFO L78 Accepts]: Start accepts. Automaton has 107 states. Word has length 365 [2020-07-21 01:50:25,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:50:25,804 INFO L225 Difference]: With dead ends: 595 [2020-07-21 01:50:25,804 INFO L226 Difference]: Without dead ends: 442 [2020-07-21 01:50:25,806 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 764 GetRequests, 589 SyntacticMatches, 35 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5321 ImplicationChecksByTransitivity, 8.7s TimeCoverageRelationStatistics Valid=5181, Invalid=14841, Unknown=0, NotChecked=0, Total=20022 [2020-07-21 01:50:25,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 442 states. [2020-07-21 01:50:25,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 442 to 302. [2020-07-21 01:50:25,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 302 states. [2020-07-21 01:50:25,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 302 states to 302 states and 322 transitions. [2020-07-21 01:50:25,818 INFO L78 Accepts]: Start accepts. Automaton has 302 states and 322 transitions. Word has length 365 [2020-07-21 01:50:25,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:50:25,818 INFO L479 AbstractCegarLoop]: Abstraction has 302 states and 322 transitions. [2020-07-21 01:50:25,818 INFO L480 AbstractCegarLoop]: Interpolant automaton has 107 states. [2020-07-21 01:50:25,818 INFO L276 IsEmpty]: Start isEmpty. Operand 302 states and 322 transitions. [2020-07-21 01:50:25,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 368 [2020-07-21 01:50:25,820 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:50:25,820 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 36, 36, 35, 35, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:50:26,021 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:50:26,021 INFO L427 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:50:26,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:50:26,022 INFO L82 PathProgramCache]: Analyzing trace with hash -814607391, now seen corresponding path program 52 times [2020-07-21 01:50:26,022 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:50:26,023 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [330220922] [2020-07-21 01:50:26,023 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 56 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:50:26,179 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:50:26,179 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:50:26,184 INFO L263 TraceCheckSpWp]: Trace formula consists of 988 conjuncts, 74 conjunts are in the unsatisfiable core [2020-07-21 01:50:26,188 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:50:29,808 INFO L134 CoverageAnalysis]: Checked inductivity of 6160 backedges. 2520 proven. 1260 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2020-07-21 01:50:29,808 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:50:34,072 INFO L134 CoverageAnalysis]: Checked inductivity of 6160 backedges. 2520 proven. 1260 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2020-07-21 01:50:34,072 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [330220922] [2020-07-21 01:50:34,073 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:50:34,073 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [74, 74] total 110 [2020-07-21 01:50:34,073 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1827289678] [2020-07-21 01:50:34,074 INFO L459 AbstractCegarLoop]: Interpolant automaton has 110 states [2020-07-21 01:50:34,074 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:50:34,074 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 110 interpolants. [2020-07-21 01:50:34,076 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2773, Invalid=9217, Unknown=0, NotChecked=0, Total=11990 [2020-07-21 01:50:34,076 INFO L87 Difference]: Start difference. First operand 302 states and 322 transitions. Second operand 110 states. [2020-07-21 01:50:39,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:50:39,480 INFO L93 Difference]: Finished difference Result 599 states and 727 transitions. [2020-07-21 01:50:39,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2020-07-21 01:50:39,481 INFO L78 Accepts]: Start accepts. Automaton has 110 states. Word has length 367 [2020-07-21 01:50:39,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:50:39,483 INFO L225 Difference]: With dead ends: 599 [2020-07-21 01:50:39,483 INFO L226 Difference]: Without dead ends: 448 [2020-07-21 01:50:39,486 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 769 GetRequests, 589 SyntacticMatches, 36 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5635 ImplicationChecksByTransitivity, 9.4s TimeCoverageRelationStatistics Valid=5473, Invalid=15697, Unknown=0, NotChecked=0, Total=21170 [2020-07-21 01:50:39,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 448 states. [2020-07-21 01:50:39,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 448 to 304. [2020-07-21 01:50:39,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 304 states. [2020-07-21 01:50:39,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 304 states to 304 states and 324 transitions. [2020-07-21 01:50:39,503 INFO L78 Accepts]: Start accepts. Automaton has 304 states and 324 transitions. Word has length 367 [2020-07-21 01:50:39,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:50:39,504 INFO L479 AbstractCegarLoop]: Abstraction has 304 states and 324 transitions. [2020-07-21 01:50:39,504 INFO L480 AbstractCegarLoop]: Interpolant automaton has 110 states. [2020-07-21 01:50:39,504 INFO L276 IsEmpty]: Start isEmpty. Operand 304 states and 324 transitions. [2020-07-21 01:50:39,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 370 [2020-07-21 01:50:39,506 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:50:39,507 INFO L422 BasicCegarLoop]: trace histogram [37, 36, 36, 36, 36, 35, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:50:39,720 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:50:39,721 INFO L427 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:50:39,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:50:39,722 INFO L82 PathProgramCache]: Analyzing trace with hash 1227173062, now seen corresponding path program 53 times [2020-07-21 01:50:39,722 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:50:39,722 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1702843344] [2020-07-21 01:50:39,722 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 57 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:50:39,885 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:50:39,886 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:50:39,890 INFO L263 TraceCheckSpWp]: Trace formula consists of 998 conjuncts, 75 conjunts are in the unsatisfiable core [2020-07-21 01:50:39,894 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:50:41,132 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 01:50:41,274 INFO L134 CoverageAnalysis]: Checked inductivity of 6232 backedges. 1402 proven. 2450 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2020-07-21 01:50:41,274 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:50:41,344 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:50:43,757 INFO L134 CoverageAnalysis]: Checked inductivity of 6232 backedges. 1402 proven. 2450 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2020-07-21 01:50:43,757 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1702843344] [2020-07-21 01:50:43,757 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:50:43,758 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41] total 42 [2020-07-21 01:50:43,758 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [273773364] [2020-07-21 01:50:43,758 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-07-21 01:50:43,758 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:50:43,759 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-07-21 01:50:43,759 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=784, Invalid=938, Unknown=0, NotChecked=0, Total=1722 [2020-07-21 01:50:43,759 INFO L87 Difference]: Start difference. First operand 304 states and 324 transitions. Second operand 42 states. [2020-07-21 01:50:44,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:50:44,464 INFO L93 Difference]: Finished difference Result 323 states and 345 transitions. [2020-07-21 01:50:44,465 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-07-21 01:50:44,466 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 369 [2020-07-21 01:50:44,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:50:44,468 INFO L225 Difference]: With dead ends: 323 [2020-07-21 01:50:44,468 INFO L226 Difference]: Without dead ends: 321 [2020-07-21 01:50:44,469 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 738 GetRequests, 625 SyntacticMatches, 72 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1547 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=788, Invalid=1018, Unknown=0, NotChecked=0, Total=1806 [2020-07-21 01:50:44,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 321 states. [2020-07-21 01:50:44,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 321 to 316. [2020-07-21 01:50:44,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 316 states. [2020-07-21 01:50:44,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 337 transitions. [2020-07-21 01:50:44,480 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 337 transitions. Word has length 369 [2020-07-21 01:50:44,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:50:44,481 INFO L479 AbstractCegarLoop]: Abstraction has 316 states and 337 transitions. [2020-07-21 01:50:44,481 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-07-21 01:50:44,481 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 337 transitions. [2020-07-21 01:50:44,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 386 [2020-07-21 01:50:44,484 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:50:44,484 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 38, 37, 37, 37, 37, 37, 37, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:50:44,694 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:50:44,694 INFO L427 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:50:44,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:50:44,695 INFO L82 PathProgramCache]: Analyzing trace with hash 1586365096, now seen corresponding path program 54 times [2020-07-21 01:50:44,695 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:50:44,696 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1510526449] [2020-07-21 01:50:44,696 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 58 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:50:44,858 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:50:44,858 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:50:44,863 INFO L263 TraceCheckSpWp]: Trace formula consists of 1032 conjuncts, 76 conjunts are in the unsatisfiable core [2020-07-21 01:50:44,867 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:50:48,825 INFO L134 CoverageAnalysis]: Checked inductivity of 6808 backedges. 2952 proven. 1332 refuted. 0 times theorem prover too weak. 2524 trivial. 0 not checked. [2020-07-21 01:50:48,826 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:50:53,552 INFO L134 CoverageAnalysis]: Checked inductivity of 6808 backedges. 2810 proven. 1332 refuted. 0 times theorem prover too weak. 2666 trivial. 0 not checked. [2020-07-21 01:50:53,552 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1510526449] [2020-07-21 01:50:53,552 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:50:53,553 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [76, 76] total 113 [2020-07-21 01:50:53,553 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1095034435] [2020-07-21 01:50:53,553 INFO L459 AbstractCegarLoop]: Interpolant automaton has 113 states [2020-07-21 01:50:53,554 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:50:53,554 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2020-07-21 01:50:53,555 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2924, Invalid=9732, Unknown=0, NotChecked=0, Total=12656 [2020-07-21 01:50:53,555 INFO L87 Difference]: Start difference. First operand 316 states and 337 transitions. Second operand 113 states. [2020-07-21 01:50:58,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:50:58,810 INFO L93 Difference]: Finished difference Result 627 states and 759 transitions. [2020-07-21 01:50:58,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2020-07-21 01:50:58,810 INFO L78 Accepts]: Start accepts. Automaton has 113 states. Word has length 385 [2020-07-21 01:50:58,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:50:58,812 INFO L225 Difference]: With dead ends: 627 [2020-07-21 01:50:58,813 INFO L226 Difference]: Without dead ends: 466 [2020-07-21 01:50:58,815 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 806 GetRequests, 621 SyntacticMatches, 37 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5958 ImplicationChecksByTransitivity, 10.4s TimeCoverageRelationStatistics Valid=5773, Invalid=16577, Unknown=0, NotChecked=0, Total=22350 [2020-07-21 01:50:58,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 466 states. [2020-07-21 01:50:58,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 466 to 318. [2020-07-21 01:50:58,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 318 states. [2020-07-21 01:50:58,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 318 states to 318 states and 339 transitions. [2020-07-21 01:50:58,827 INFO L78 Accepts]: Start accepts. Automaton has 318 states and 339 transitions. Word has length 385 [2020-07-21 01:50:58,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:50:58,828 INFO L479 AbstractCegarLoop]: Abstraction has 318 states and 339 transitions. [2020-07-21 01:50:58,828 INFO L480 AbstractCegarLoop]: Interpolant automaton has 113 states. [2020-07-21 01:50:58,828 INFO L276 IsEmpty]: Start isEmpty. Operand 318 states and 339 transitions. [2020-07-21 01:50:58,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 388 [2020-07-21 01:50:58,830 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:50:58,830 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 38, 38, 37, 37, 37, 37, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:50:59,030 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:50:59,031 INFO L427 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:50:59,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:50:59,031 INFO L82 PathProgramCache]: Analyzing trace with hash -468415411, now seen corresponding path program 55 times [2020-07-21 01:50:59,032 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:50:59,032 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [667691176] [2020-07-21 01:50:59,032 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 59 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:50:59,199 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:50:59,200 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:50:59,204 INFO L263 TraceCheckSpWp]: Trace formula consists of 1042 conjuncts, 78 conjunts are in the unsatisfiable core [2020-07-21 01:50:59,208 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:51:03,558 INFO L134 CoverageAnalysis]: Checked inductivity of 6882 backedges. 2812 proven. 1406 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2020-07-21 01:51:03,559 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:51:08,692 INFO L134 CoverageAnalysis]: Checked inductivity of 6882 backedges. 2812 proven. 1406 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2020-07-21 01:51:08,693 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [667691176] [2020-07-21 01:51:08,693 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:51:08,693 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [78, 78] total 116 [2020-07-21 01:51:08,693 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [84266458] [2020-07-21 01:51:08,694 INFO L459 AbstractCegarLoop]: Interpolant automaton has 116 states [2020-07-21 01:51:08,694 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:51:08,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2020-07-21 01:51:08,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3079, Invalid=10261, Unknown=0, NotChecked=0, Total=13340 [2020-07-21 01:51:08,696 INFO L87 Difference]: Start difference. First operand 318 states and 339 transitions. Second operand 116 states. [2020-07-21 01:51:14,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:51:14,403 INFO L93 Difference]: Finished difference Result 631 states and 766 transitions. [2020-07-21 01:51:14,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2020-07-21 01:51:14,403 INFO L78 Accepts]: Start accepts. Automaton has 116 states. Word has length 387 [2020-07-21 01:51:14,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:51:14,406 INFO L225 Difference]: With dead ends: 631 [2020-07-21 01:51:14,406 INFO L226 Difference]: Without dead ends: 472 [2020-07-21 01:51:14,408 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 811 GetRequests, 621 SyntacticMatches, 38 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6290 ImplicationChecksByTransitivity, 11.4s TimeCoverageRelationStatistics Valid=6081, Invalid=17481, Unknown=0, NotChecked=0, Total=23562 [2020-07-21 01:51:14,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 472 states. [2020-07-21 01:51:14,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 472 to 320. [2020-07-21 01:51:14,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 320 states. [2020-07-21 01:51:14,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 320 states to 320 states and 341 transitions. [2020-07-21 01:51:14,420 INFO L78 Accepts]: Start accepts. Automaton has 320 states and 341 transitions. Word has length 387 [2020-07-21 01:51:14,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:51:14,420 INFO L479 AbstractCegarLoop]: Abstraction has 320 states and 341 transitions. [2020-07-21 01:51:14,420 INFO L480 AbstractCegarLoop]: Interpolant automaton has 116 states. [2020-07-21 01:51:14,420 INFO L276 IsEmpty]: Start isEmpty. Operand 320 states and 341 transitions. [2020-07-21 01:51:14,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 390 [2020-07-21 01:51:14,422 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:51:14,422 INFO L422 BasicCegarLoop]: trace histogram [39, 38, 38, 38, 38, 37, 37, 37, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:51:14,622 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:51:14,623 INFO L427 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:51:14,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:51:14,624 INFO L82 PathProgramCache]: Analyzing trace with hash 572473522, now seen corresponding path program 56 times [2020-07-21 01:51:14,624 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:51:14,624 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1633440979] [2020-07-21 01:51:14,624 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 60 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:51:14,795 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:51:14,795 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:51:14,800 INFO L263 TraceCheckSpWp]: Trace formula consists of 1052 conjuncts, 79 conjunts are in the unsatisfiable core [2020-07-21 01:51:14,804 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:51:16,266 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 01:51:16,421 INFO L134 CoverageAnalysis]: Checked inductivity of 6958 backedges. 1556 proven. 2738 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2020-07-21 01:51:16,421 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:51:16,517 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:51:19,422 INFO L134 CoverageAnalysis]: Checked inductivity of 6958 backedges. 1556 proven. 2738 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2020-07-21 01:51:19,423 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1633440979] [2020-07-21 01:51:19,423 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:51:19,423 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43] total 44 [2020-07-21 01:51:19,423 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1608467956] [2020-07-21 01:51:19,424 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-07-21 01:51:19,424 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:51:19,424 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-07-21 01:51:19,424 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=865, Invalid=1027, Unknown=0, NotChecked=0, Total=1892 [2020-07-21 01:51:19,424 INFO L87 Difference]: Start difference. First operand 320 states and 341 transitions. Second operand 44 states. [2020-07-21 01:51:20,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:51:20,255 INFO L93 Difference]: Finished difference Result 339 states and 362 transitions. [2020-07-21 01:51:20,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-07-21 01:51:20,257 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 389 [2020-07-21 01:51:20,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:51:20,259 INFO L225 Difference]: With dead ends: 339 [2020-07-21 01:51:20,259 INFO L226 Difference]: Without dead ends: 337 [2020-07-21 01:51:20,260 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 778 GetRequests, 659 SyntacticMatches, 76 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1709 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=869, Invalid=1111, Unknown=0, NotChecked=0, Total=1980 [2020-07-21 01:51:20,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 337 states. [2020-07-21 01:51:20,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 337 to 332. [2020-07-21 01:51:20,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 332 states. [2020-07-21 01:51:20,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 332 states to 332 states and 354 transitions. [2020-07-21 01:51:20,273 INFO L78 Accepts]: Start accepts. Automaton has 332 states and 354 transitions. Word has length 389 [2020-07-21 01:51:20,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:51:20,273 INFO L479 AbstractCegarLoop]: Abstraction has 332 states and 354 transitions. [2020-07-21 01:51:20,274 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-07-21 01:51:20,274 INFO L276 IsEmpty]: Start isEmpty. Operand 332 states and 354 transitions. [2020-07-21 01:51:20,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 406 [2020-07-21 01:51:20,275 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:51:20,276 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 40, 39, 39, 39, 39, 39, 39, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:51:20,476 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:51:20,476 INFO L427 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:51:20,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:51:20,477 INFO L82 PathProgramCache]: Analyzing trace with hash -73744748, now seen corresponding path program 57 times [2020-07-21 01:51:20,477 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:51:20,478 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [962817217] [2020-07-21 01:51:20,478 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 61 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:51:20,651 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:51:20,651 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:51:20,656 INFO L263 TraceCheckSpWp]: Trace formula consists of 1086 conjuncts, 80 conjunts are in the unsatisfiable core [2020-07-21 01:51:20,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:51:25,377 INFO L134 CoverageAnalysis]: Checked inductivity of 7566 backedges. 3268 proven. 1482 refuted. 0 times theorem prover too weak. 2816 trivial. 0 not checked. [2020-07-21 01:51:25,377 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:51:31,028 INFO L134 CoverageAnalysis]: Checked inductivity of 7566 backedges. 3118 proven. 1482 refuted. 0 times theorem prover too weak. 2966 trivial. 0 not checked. [2020-07-21 01:51:31,028 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [962817217] [2020-07-21 01:51:31,029 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:51:31,029 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [80, 80] total 119 [2020-07-21 01:51:31,029 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1859873646] [2020-07-21 01:51:31,030 INFO L459 AbstractCegarLoop]: Interpolant automaton has 119 states [2020-07-21 01:51:31,030 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:51:31,030 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2020-07-21 01:51:31,031 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3238, Invalid=10804, Unknown=0, NotChecked=0, Total=14042 [2020-07-21 01:51:31,031 INFO L87 Difference]: Start difference. First operand 332 states and 354 transitions. Second operand 119 states. [2020-07-21 01:51:37,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:51:37,780 INFO L93 Difference]: Finished difference Result 659 states and 798 transitions. [2020-07-21 01:51:37,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2020-07-21 01:51:37,780 INFO L78 Accepts]: Start accepts. Automaton has 119 states. Word has length 405 [2020-07-21 01:51:37,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:51:37,782 INFO L225 Difference]: With dead ends: 659 [2020-07-21 01:51:37,782 INFO L226 Difference]: Without dead ends: 490 [2020-07-21 01:51:37,784 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 848 GetRequests, 653 SyntacticMatches, 39 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6631 ImplicationChecksByTransitivity, 12.6s TimeCoverageRelationStatistics Valid=6397, Invalid=18409, Unknown=0, NotChecked=0, Total=24806 [2020-07-21 01:51:37,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 490 states. [2020-07-21 01:51:37,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 490 to 334. [2020-07-21 01:51:37,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 334 states. [2020-07-21 01:51:37,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 334 states to 334 states and 356 transitions. [2020-07-21 01:51:37,799 INFO L78 Accepts]: Start accepts. Automaton has 334 states and 356 transitions. Word has length 405 [2020-07-21 01:51:37,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:51:37,799 INFO L479 AbstractCegarLoop]: Abstraction has 334 states and 356 transitions. [2020-07-21 01:51:37,799 INFO L480 AbstractCegarLoop]: Interpolant automaton has 119 states. [2020-07-21 01:51:37,799 INFO L276 IsEmpty]: Start isEmpty. Operand 334 states and 356 transitions. [2020-07-21 01:51:37,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 408 [2020-07-21 01:51:37,801 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:51:37,802 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 40, 40, 39, 39, 39, 39, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:51:38,005 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:51:38,006 INFO L427 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:51:38,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:51:38,007 INFO L82 PathProgramCache]: Analyzing trace with hash 2082014137, now seen corresponding path program 58 times [2020-07-21 01:51:38,007 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:51:38,007 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [263574481] [2020-07-21 01:51:38,008 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 62 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:51:38,182 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:51:38,182 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:51:38,187 INFO L263 TraceCheckSpWp]: Trace formula consists of 1096 conjuncts, 82 conjunts are in the unsatisfiable core [2020-07-21 01:51:38,191 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:51:43,346 INFO L134 CoverageAnalysis]: Checked inductivity of 7644 backedges. 3120 proven. 1560 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2020-07-21 01:51:43,346 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:51:49,435 INFO L134 CoverageAnalysis]: Checked inductivity of 7644 backedges. 3120 proven. 1560 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2020-07-21 01:51:49,436 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [263574481] [2020-07-21 01:51:49,436 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:51:49,436 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [82, 82] total 122 [2020-07-21 01:51:49,436 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [213921631] [2020-07-21 01:51:49,437 INFO L459 AbstractCegarLoop]: Interpolant automaton has 122 states [2020-07-21 01:51:49,437 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:51:49,437 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 122 interpolants. [2020-07-21 01:51:49,438 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3401, Invalid=11361, Unknown=0, NotChecked=0, Total=14762 [2020-07-21 01:51:49,438 INFO L87 Difference]: Start difference. First operand 334 states and 356 transitions. Second operand 122 states. [2020-07-21 01:51:56,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:51:56,291 INFO L93 Difference]: Finished difference Result 663 states and 805 transitions. [2020-07-21 01:51:56,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2020-07-21 01:51:56,291 INFO L78 Accepts]: Start accepts. Automaton has 122 states. Word has length 407 [2020-07-21 01:51:56,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:51:56,293 INFO L225 Difference]: With dead ends: 663 [2020-07-21 01:51:56,294 INFO L226 Difference]: Without dead ends: 496 [2020-07-21 01:51:56,297 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 853 GetRequests, 653 SyntacticMatches, 40 SemanticMatches, 160 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6981 ImplicationChecksByTransitivity, 13.6s TimeCoverageRelationStatistics Valid=6721, Invalid=19361, Unknown=0, NotChecked=0, Total=26082 [2020-07-21 01:51:56,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 496 states. [2020-07-21 01:51:56,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 496 to 336. [2020-07-21 01:51:56,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 336 states. [2020-07-21 01:51:56,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 336 states to 336 states and 358 transitions. [2020-07-21 01:51:56,316 INFO L78 Accepts]: Start accepts. Automaton has 336 states and 358 transitions. Word has length 407 [2020-07-21 01:51:56,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:51:56,317 INFO L479 AbstractCegarLoop]: Abstraction has 336 states and 358 transitions. [2020-07-21 01:51:56,317 INFO L480 AbstractCegarLoop]: Interpolant automaton has 122 states. [2020-07-21 01:51:56,317 INFO L276 IsEmpty]: Start isEmpty. Operand 336 states and 358 transitions. [2020-07-21 01:51:56,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 410 [2020-07-21 01:51:56,320 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:51:56,320 INFO L422 BasicCegarLoop]: trace histogram [41, 40, 40, 40, 40, 39, 39, 39, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:51:56,533 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:51:56,534 INFO L427 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:51:56,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:51:56,535 INFO L82 PathProgramCache]: Analyzing trace with hash -702901346, now seen corresponding path program 59 times [2020-07-21 01:51:56,535 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:51:56,535 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1089289138] [2020-07-21 01:51:56,535 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 63 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:51:56,711 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:51:56,711 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:51:56,717 INFO L263 TraceCheckSpWp]: Trace formula consists of 1106 conjuncts, 83 conjunts are in the unsatisfiable core [2020-07-21 01:51:56,721 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:51:58,467 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 01:51:58,641 INFO L134 CoverageAnalysis]: Checked inductivity of 7724 backedges. 1718 proven. 3042 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2020-07-21 01:51:58,641 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:51:58,729 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:52:02,215 INFO L134 CoverageAnalysis]: Checked inductivity of 7724 backedges. 1718 proven. 3042 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2020-07-21 01:52:02,216 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1089289138] [2020-07-21 01:52:02,216 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:52:02,216 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45] total 46 [2020-07-21 01:52:02,216 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [99848120] [2020-07-21 01:52:02,217 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-07-21 01:52:02,217 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:52:02,217 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-07-21 01:52:02,217 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=950, Invalid=1120, Unknown=0, NotChecked=0, Total=2070 [2020-07-21 01:52:02,217 INFO L87 Difference]: Start difference. First operand 336 states and 358 transitions. Second operand 46 states. [2020-07-21 01:52:03,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:52:03,166 INFO L93 Difference]: Finished difference Result 355 states and 379 transitions. [2020-07-21 01:52:03,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-07-21 01:52:03,168 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 409 [2020-07-21 01:52:03,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:52:03,170 INFO L225 Difference]: With dead ends: 355 [2020-07-21 01:52:03,171 INFO L226 Difference]: Without dead ends: 353 [2020-07-21 01:52:03,171 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 818 GetRequests, 693 SyntacticMatches, 80 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1879 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=954, Invalid=1208, Unknown=0, NotChecked=0, Total=2162 [2020-07-21 01:52:03,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2020-07-21 01:52:03,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 348. [2020-07-21 01:52:03,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 348 states. [2020-07-21 01:52:03,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 348 states to 348 states and 371 transitions. [2020-07-21 01:52:03,189 INFO L78 Accepts]: Start accepts. Automaton has 348 states and 371 transitions. Word has length 409 [2020-07-21 01:52:03,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:52:03,189 INFO L479 AbstractCegarLoop]: Abstraction has 348 states and 371 transitions. [2020-07-21 01:52:03,189 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-07-21 01:52:03,189 INFO L276 IsEmpty]: Start isEmpty. Operand 348 states and 371 transitions. [2020-07-21 01:52:03,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 426 [2020-07-21 01:52:03,191 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:52:03,191 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 42, 41, 41, 41, 41, 41, 41, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:52:03,392 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:52:03,392 INFO L427 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:52:03,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:52:03,393 INFO L82 PathProgramCache]: Analyzing trace with hash 524990848, now seen corresponding path program 60 times [2020-07-21 01:52:03,393 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:52:03,394 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1047600033] [2020-07-21 01:52:03,394 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 64 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:52:03,580 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:52:03,580 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:52:03,586 INFO L263 TraceCheckSpWp]: Trace formula consists of 1140 conjuncts, 84 conjunts are in the unsatisfiable core [2020-07-21 01:52:03,590 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:52:09,270 INFO L134 CoverageAnalysis]: Checked inductivity of 8364 backedges. 3600 proven. 1640 refuted. 0 times theorem prover too weak. 3124 trivial. 0 not checked. [2020-07-21 01:52:09,271 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:52:16,689 INFO L134 CoverageAnalysis]: Checked inductivity of 8364 backedges. 3442 proven. 1640 refuted. 0 times theorem prover too weak. 3282 trivial. 0 not checked. [2020-07-21 01:52:16,689 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1047600033] [2020-07-21 01:52:16,689 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:52:16,690 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [84, 84] total 125 [2020-07-21 01:52:16,690 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [344047014] [2020-07-21 01:52:16,691 INFO L459 AbstractCegarLoop]: Interpolant automaton has 125 states [2020-07-21 01:52:16,691 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:52:16,692 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 125 interpolants. [2020-07-21 01:52:16,692 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3568, Invalid=11932, Unknown=0, NotChecked=0, Total=15500 [2020-07-21 01:52:16,692 INFO L87 Difference]: Start difference. First operand 348 states and 371 transitions. Second operand 125 states. [2020-07-21 01:52:24,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:52:24,966 INFO L93 Difference]: Finished difference Result 691 states and 837 transitions. [2020-07-21 01:52:24,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2020-07-21 01:52:24,966 INFO L78 Accepts]: Start accepts. Automaton has 125 states. Word has length 425 [2020-07-21 01:52:24,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:52:24,968 INFO L225 Difference]: With dead ends: 691 [2020-07-21 01:52:24,969 INFO L226 Difference]: Without dead ends: 514 [2020-07-21 01:52:24,970 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 890 GetRequests, 685 SyntacticMatches, 41 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7340 ImplicationChecksByTransitivity, 15.9s TimeCoverageRelationStatistics Valid=7053, Invalid=20337, Unknown=0, NotChecked=0, Total=27390 [2020-07-21 01:52:24,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 514 states. [2020-07-21 01:52:24,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 514 to 350. [2020-07-21 01:52:24,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 350 states. [2020-07-21 01:52:24,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 350 states to 350 states and 373 transitions. [2020-07-21 01:52:24,984 INFO L78 Accepts]: Start accepts. Automaton has 350 states and 373 transitions. Word has length 425 [2020-07-21 01:52:24,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:52:24,984 INFO L479 AbstractCegarLoop]: Abstraction has 350 states and 373 transitions. [2020-07-21 01:52:24,984 INFO L480 AbstractCegarLoop]: Interpolant automaton has 125 states. [2020-07-21 01:52:24,984 INFO L276 IsEmpty]: Start isEmpty. Operand 350 states and 373 transitions. [2020-07-21 01:52:24,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 428 [2020-07-21 01:52:24,986 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:52:24,987 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 42, 42, 41, 41, 41, 41, 41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:52:25,187 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:52:25,188 INFO L427 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:52:25,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:52:25,189 INFO L82 PathProgramCache]: Analyzing trace with hash -2129659355, now seen corresponding path program 61 times [2020-07-21 01:52:25,189 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:52:25,189 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1971589726] [2020-07-21 01:52:25,190 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 65 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:52:25,372 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:52:25,372 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:52:25,378 INFO L263 TraceCheckSpWp]: Trace formula consists of 1150 conjuncts, 86 conjunts are in the unsatisfiable core [2020-07-21 01:52:25,383 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:52:32,023 INFO L134 CoverageAnalysis]: Checked inductivity of 8446 backedges. 3444 proven. 1722 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2020-07-21 01:52:32,024 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:52:39,924 INFO L134 CoverageAnalysis]: Checked inductivity of 8446 backedges. 3444 proven. 1722 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2020-07-21 01:52:39,924 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1971589726] [2020-07-21 01:52:39,924 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:52:39,925 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [86, 86] total 128 [2020-07-21 01:52:39,925 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [547369659] [2020-07-21 01:52:39,926 INFO L459 AbstractCegarLoop]: Interpolant automaton has 128 states [2020-07-21 01:52:39,926 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:52:39,926 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 128 interpolants. [2020-07-21 01:52:39,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3739, Invalid=12517, Unknown=0, NotChecked=0, Total=16256 [2020-07-21 01:52:39,927 INFO L87 Difference]: Start difference. First operand 350 states and 373 transitions. Second operand 128 states. [2020-07-21 01:52:48,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:52:48,562 INFO L93 Difference]: Finished difference Result 695 states and 844 transitions. [2020-07-21 01:52:48,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2020-07-21 01:52:48,563 INFO L78 Accepts]: Start accepts. Automaton has 128 states. Word has length 427 [2020-07-21 01:52:48,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:52:48,566 INFO L225 Difference]: With dead ends: 695 [2020-07-21 01:52:48,566 INFO L226 Difference]: Without dead ends: 520 [2020-07-21 01:52:48,568 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 895 GetRequests, 685 SyntacticMatches, 42 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7708 ImplicationChecksByTransitivity, 17.6s TimeCoverageRelationStatistics Valid=7393, Invalid=21337, Unknown=0, NotChecked=0, Total=28730 [2020-07-21 01:52:48,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 520 states. [2020-07-21 01:52:48,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 520 to 352. [2020-07-21 01:52:48,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 352 states. [2020-07-21 01:52:48,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 352 states to 352 states and 375 transitions. [2020-07-21 01:52:48,583 INFO L78 Accepts]: Start accepts. Automaton has 352 states and 375 transitions. Word has length 427 [2020-07-21 01:52:48,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:52:48,584 INFO L479 AbstractCegarLoop]: Abstraction has 352 states and 375 transitions. [2020-07-21 01:52:48,584 INFO L480 AbstractCegarLoop]: Interpolant automaton has 128 states. [2020-07-21 01:52:48,584 INFO L276 IsEmpty]: Start isEmpty. Operand 352 states and 375 transitions. [2020-07-21 01:52:48,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 430 [2020-07-21 01:52:48,587 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:52:48,587 INFO L422 BasicCegarLoop]: trace histogram [43, 42, 42, 42, 42, 41, 41, 41, 41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:52:48,801 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 65 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:52:48,802 INFO L427 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:52:48,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:52:48,803 INFO L82 PathProgramCache]: Analyzing trace with hash -2037930614, now seen corresponding path program 62 times [2020-07-21 01:52:48,803 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:52:48,803 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [301609195] [2020-07-21 01:52:48,803 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 66 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:52:48,990 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:52:48,990 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:52:48,996 INFO L263 TraceCheckSpWp]: Trace formula consists of 1160 conjuncts, 87 conjunts are in the unsatisfiable core [2020-07-21 01:52:49,000 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:52:51,179 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 01:52:51,397 INFO L134 CoverageAnalysis]: Checked inductivity of 8530 backedges. 1888 proven. 3362 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2020-07-21 01:52:51,397 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:52:51,492 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:52:56,101 INFO L134 CoverageAnalysis]: Checked inductivity of 8530 backedges. 1888 proven. 3362 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2020-07-21 01:52:56,102 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [301609195] [2020-07-21 01:52:56,102 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:52:56,102 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47] total 48 [2020-07-21 01:52:56,102 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1545002495] [2020-07-21 01:52:56,103 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-07-21 01:52:56,103 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:52:56,103 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-07-21 01:52:56,103 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1039, Invalid=1217, Unknown=0, NotChecked=0, Total=2256 [2020-07-21 01:52:56,103 INFO L87 Difference]: Start difference. First operand 352 states and 375 transitions. Second operand 48 states. [2020-07-21 01:52:57,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:52:57,207 INFO L93 Difference]: Finished difference Result 371 states and 396 transitions. [2020-07-21 01:52:57,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-21 01:52:57,211 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 429 [2020-07-21 01:52:57,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:52:57,213 INFO L225 Difference]: With dead ends: 371 [2020-07-21 01:52:57,214 INFO L226 Difference]: Without dead ends: 369 [2020-07-21 01:52:57,214 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 858 GetRequests, 727 SyntacticMatches, 84 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2057 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=1043, Invalid=1309, Unknown=0, NotChecked=0, Total=2352 [2020-07-21 01:52:57,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 369 states. [2020-07-21 01:52:57,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 369 to 364. [2020-07-21 01:52:57,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 364 states. [2020-07-21 01:52:57,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 364 states to 364 states and 388 transitions. [2020-07-21 01:52:57,228 INFO L78 Accepts]: Start accepts. Automaton has 364 states and 388 transitions. Word has length 429 [2020-07-21 01:52:57,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:52:57,229 INFO L479 AbstractCegarLoop]: Abstraction has 364 states and 388 transitions. [2020-07-21 01:52:57,229 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-07-21 01:52:57,229 INFO L276 IsEmpty]: Start isEmpty. Operand 364 states and 388 transitions. [2020-07-21 01:52:57,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 446 [2020-07-21 01:52:57,231 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:52:57,231 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 44, 43, 43, 43, 43, 43, 43, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:52:57,432 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:52:57,432 INFO L427 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:52:57,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:52:57,433 INFO L82 PathProgramCache]: Analyzing trace with hash -99716244, now seen corresponding path program 63 times [2020-07-21 01:52:57,433 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:52:57,434 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [310522564] [2020-07-21 01:52:57,434 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 67 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:52:57,623 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:52:57,623 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:52:57,628 INFO L263 TraceCheckSpWp]: Trace formula consists of 1194 conjuncts, 88 conjunts are in the unsatisfiable core [2020-07-21 01:52:57,632 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:53:04,715 INFO L134 CoverageAnalysis]: Checked inductivity of 9202 backedges. 3948 proven. 1806 refuted. 0 times theorem prover too weak. 3448 trivial. 0 not checked. [2020-07-21 01:53:04,716 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:53:13,806 INFO L134 CoverageAnalysis]: Checked inductivity of 9202 backedges. 3782 proven. 1806 refuted. 0 times theorem prover too weak. 3614 trivial. 0 not checked. [2020-07-21 01:53:13,807 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [310522564] [2020-07-21 01:53:13,807 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:53:13,807 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [88, 88] total 131 [2020-07-21 01:53:13,807 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [98972599] [2020-07-21 01:53:13,808 INFO L459 AbstractCegarLoop]: Interpolant automaton has 131 states [2020-07-21 01:53:13,808 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:53:13,809 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 131 interpolants. [2020-07-21 01:53:13,810 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3914, Invalid=13116, Unknown=0, NotChecked=0, Total=17030 [2020-07-21 01:53:13,810 INFO L87 Difference]: Start difference. First operand 364 states and 388 transitions. Second operand 131 states. [2020-07-21 01:53:23,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:53:23,309 INFO L93 Difference]: Finished difference Result 723 states and 876 transitions. [2020-07-21 01:53:23,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2020-07-21 01:53:23,310 INFO L78 Accepts]: Start accepts. Automaton has 131 states. Word has length 445 [2020-07-21 01:53:23,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:53:23,312 INFO L225 Difference]: With dead ends: 723 [2020-07-21 01:53:23,312 INFO L226 Difference]: Without dead ends: 538 [2020-07-21 01:53:23,314 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 932 GetRequests, 717 SyntacticMatches, 43 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8085 ImplicationChecksByTransitivity, 19.7s TimeCoverageRelationStatistics Valid=7741, Invalid=22361, Unknown=0, NotChecked=0, Total=30102 [2020-07-21 01:53:23,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 538 states. [2020-07-21 01:53:23,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 538 to 366. [2020-07-21 01:53:23,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 366 states. [2020-07-21 01:53:23,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 366 states to 366 states and 390 transitions. [2020-07-21 01:53:23,328 INFO L78 Accepts]: Start accepts. Automaton has 366 states and 390 transitions. Word has length 445 [2020-07-21 01:53:23,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:53:23,329 INFO L479 AbstractCegarLoop]: Abstraction has 366 states and 390 transitions. [2020-07-21 01:53:23,329 INFO L480 AbstractCegarLoop]: Interpolant automaton has 131 states. [2020-07-21 01:53:23,329 INFO L276 IsEmpty]: Start isEmpty. Operand 366 states and 390 transitions. [2020-07-21 01:53:23,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 448 [2020-07-21 01:53:23,331 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:53:23,331 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 44, 44, 43, 43, 43, 43, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:53:23,531 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:53:23,532 INFO L427 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:53:23,532 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:53:23,532 INFO L82 PathProgramCache]: Analyzing trace with hash 592048017, now seen corresponding path program 64 times [2020-07-21 01:53:23,533 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:53:23,533 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [637626438] [2020-07-21 01:53:23,533 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 68 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:53:23,725 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:53:23,725 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:53:23,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 1204 conjuncts, 90 conjunts are in the unsatisfiable core [2020-07-21 01:53:23,735 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:53:31,797 INFO L134 CoverageAnalysis]: Checked inductivity of 9288 backedges. 3784 proven. 1892 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2020-07-21 01:53:31,798 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:53:41,537 INFO L134 CoverageAnalysis]: Checked inductivity of 9288 backedges. 3784 proven. 1892 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2020-07-21 01:53:41,538 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [637626438] [2020-07-21 01:53:41,538 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:53:41,538 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [90, 90] total 134 [2020-07-21 01:53:41,538 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [184032836] [2020-07-21 01:53:41,539 INFO L459 AbstractCegarLoop]: Interpolant automaton has 134 states [2020-07-21 01:53:41,539 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:53:41,539 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 134 interpolants. [2020-07-21 01:53:41,540 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4093, Invalid=13729, Unknown=0, NotChecked=0, Total=17822 [2020-07-21 01:53:41,540 INFO L87 Difference]: Start difference. First operand 366 states and 390 transitions. Second operand 134 states. [2020-07-21 01:53:52,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:53:52,878 INFO L93 Difference]: Finished difference Result 727 states and 883 transitions. [2020-07-21 01:53:52,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2020-07-21 01:53:52,878 INFO L78 Accepts]: Start accepts. Automaton has 134 states. Word has length 447 [2020-07-21 01:53:52,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:53:52,881 INFO L225 Difference]: With dead ends: 727 [2020-07-21 01:53:52,881 INFO L226 Difference]: Without dead ends: 544 [2020-07-21 01:53:52,883 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 937 GetRequests, 717 SyntacticMatches, 44 SemanticMatches, 176 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8471 ImplicationChecksByTransitivity, 21.7s TimeCoverageRelationStatistics Valid=8097, Invalid=23409, Unknown=0, NotChecked=0, Total=31506 [2020-07-21 01:53:52,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 544 states. [2020-07-21 01:53:52,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 544 to 368. [2020-07-21 01:53:52,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 368 states. [2020-07-21 01:53:52,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 368 states to 368 states and 392 transitions. [2020-07-21 01:53:52,902 INFO L78 Accepts]: Start accepts. Automaton has 368 states and 392 transitions. Word has length 447 [2020-07-21 01:53:52,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:53:52,902 INFO L479 AbstractCegarLoop]: Abstraction has 368 states and 392 transitions. [2020-07-21 01:53:52,902 INFO L480 AbstractCegarLoop]: Interpolant automaton has 134 states. [2020-07-21 01:53:52,902 INFO L276 IsEmpty]: Start isEmpty. Operand 368 states and 392 transitions. [2020-07-21 01:53:52,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 450 [2020-07-21 01:53:52,904 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:53:52,904 INFO L422 BasicCegarLoop]: trace histogram [45, 44, 44, 44, 44, 43, 43, 43, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:53:53,105 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:53:53,106 INFO L427 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:53:53,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:53:53,106 INFO L82 PathProgramCache]: Analyzing trace with hash -342428042, now seen corresponding path program 65 times [2020-07-21 01:53:53,107 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:53:53,107 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1738210680] [2020-07-21 01:53:53,107 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 69 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:53:53,305 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:53:53,306 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:53:53,310 INFO L263 TraceCheckSpWp]: Trace formula consists of 1214 conjuncts, 91 conjunts are in the unsatisfiable core [2020-07-21 01:53:53,314 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:53:56,189 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 01:53:56,447 INFO L134 CoverageAnalysis]: Checked inductivity of 9376 backedges. 2066 proven. 3698 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2020-07-21 01:53:56,447 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:53:56,585 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:54:02,418 INFO L134 CoverageAnalysis]: Checked inductivity of 9376 backedges. 2066 proven. 3698 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2020-07-21 01:54:02,419 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1738210680] [2020-07-21 01:54:02,419 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:54:02,419 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49] total 50 [2020-07-21 01:54:02,419 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [692016534] [2020-07-21 01:54:02,420 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-07-21 01:54:02,420 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:54:02,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-07-21 01:54:02,420 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1132, Invalid=1318, Unknown=0, NotChecked=0, Total=2450 [2020-07-21 01:54:02,421 INFO L87 Difference]: Start difference. First operand 368 states and 392 transitions. Second operand 50 states. [2020-07-21 01:54:03,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:54:03,864 INFO L93 Difference]: Finished difference Result 387 states and 413 transitions. [2020-07-21 01:54:03,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-07-21 01:54:03,866 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 449 [2020-07-21 01:54:03,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:54:03,869 INFO L225 Difference]: With dead ends: 387 [2020-07-21 01:54:03,870 INFO L226 Difference]: Without dead ends: 385 [2020-07-21 01:54:03,870 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 898 GetRequests, 761 SyntacticMatches, 88 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2243 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=1136, Invalid=1414, Unknown=0, NotChecked=0, Total=2550 [2020-07-21 01:54:03,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 385 states. [2020-07-21 01:54:03,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 385 to 380. [2020-07-21 01:54:03,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 380 states. [2020-07-21 01:54:03,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 380 states to 380 states and 405 transitions. [2020-07-21 01:54:03,889 INFO L78 Accepts]: Start accepts. Automaton has 380 states and 405 transitions. Word has length 449 [2020-07-21 01:54:03,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:54:03,890 INFO L479 AbstractCegarLoop]: Abstraction has 380 states and 405 transitions. [2020-07-21 01:54:03,890 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-07-21 01:54:03,890 INFO L276 IsEmpty]: Start isEmpty. Operand 380 states and 405 transitions. [2020-07-21 01:54:03,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 466 [2020-07-21 01:54:03,892 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:54:03,892 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 46, 45, 45, 45, 45, 45, 45, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:54:04,093 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 69 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:54:04,093 INFO L427 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:54:04,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:54:04,094 INFO L82 PathProgramCache]: Analyzing trace with hash -753505192, now seen corresponding path program 66 times [2020-07-21 01:54:04,095 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:54:04,095 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [356325447] [2020-07-21 01:54:04,095 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 70 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:54:04,295 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:54:04,295 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:54:04,301 INFO L263 TraceCheckSpWp]: Trace formula consists of 1248 conjuncts, 92 conjunts are in the unsatisfiable core [2020-07-21 01:54:04,306 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:54:13,524 INFO L134 CoverageAnalysis]: Checked inductivity of 10080 backedges. 4312 proven. 1980 refuted. 0 times theorem prover too weak. 3788 trivial. 0 not checked. [2020-07-21 01:54:13,524 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:54:24,717 INFO L134 CoverageAnalysis]: Checked inductivity of 10080 backedges. 4138 proven. 1980 refuted. 0 times theorem prover too weak. 3962 trivial. 0 not checked. [2020-07-21 01:54:24,718 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [356325447] [2020-07-21 01:54:24,718 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:54:24,718 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [92, 92] total 137 [2020-07-21 01:54:24,718 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1725044216] [2020-07-21 01:54:24,719 INFO L459 AbstractCegarLoop]: Interpolant automaton has 137 states [2020-07-21 01:54:24,719 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:54:24,720 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 137 interpolants. [2020-07-21 01:54:24,721 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4276, Invalid=14356, Unknown=0, NotChecked=0, Total=18632 [2020-07-21 01:54:24,721 INFO L87 Difference]: Start difference. First operand 380 states and 405 transitions. Second operand 137 states. [2020-07-21 01:54:35,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:54:35,958 INFO L93 Difference]: Finished difference Result 755 states and 915 transitions. [2020-07-21 01:54:35,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2020-07-21 01:54:35,958 INFO L78 Accepts]: Start accepts. Automaton has 137 states. Word has length 465 [2020-07-21 01:54:35,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:54:35,961 INFO L225 Difference]: With dead ends: 755 [2020-07-21 01:54:35,961 INFO L226 Difference]: Without dead ends: 562 [2020-07-21 01:54:35,963 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 974 GetRequests, 749 SyntacticMatches, 45 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8866 ImplicationChecksByTransitivity, 24.5s TimeCoverageRelationStatistics Valid=8461, Invalid=24481, Unknown=0, NotChecked=0, Total=32942 [2020-07-21 01:54:35,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 562 states. [2020-07-21 01:54:35,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 562 to 382. [2020-07-21 01:54:35,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 382 states. [2020-07-21 01:54:35,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 382 states to 382 states and 407 transitions. [2020-07-21 01:54:35,979 INFO L78 Accepts]: Start accepts. Automaton has 382 states and 407 transitions. Word has length 465 [2020-07-21 01:54:35,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:54:35,979 INFO L479 AbstractCegarLoop]: Abstraction has 382 states and 407 transitions. [2020-07-21 01:54:35,979 INFO L480 AbstractCegarLoop]: Interpolant automaton has 137 states. [2020-07-21 01:54:35,979 INFO L276 IsEmpty]: Start isEmpty. Operand 382 states and 407 transitions. [2020-07-21 01:54:35,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 468 [2020-07-21 01:54:35,983 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:54:35,983 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 46, 46, 45, 45, 45, 45, 45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:54:36,196 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:54:36,197 INFO L427 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:54:36,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:54:36,198 INFO L82 PathProgramCache]: Analyzing trace with hash -103324675, now seen corresponding path program 67 times [2020-07-21 01:54:36,198 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:54:36,199 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [267362265] [2020-07-21 01:54:36,199 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 71 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:54:36,394 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:54:36,394 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:54:36,399 INFO L263 TraceCheckSpWp]: Trace formula consists of 1258 conjuncts, 94 conjunts are in the unsatisfiable core [2020-07-21 01:54:36,403 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:54:46,355 INFO L134 CoverageAnalysis]: Checked inductivity of 10170 backedges. 4140 proven. 2070 refuted. 0 times theorem prover too weak. 3960 trivial. 0 not checked. [2020-07-21 01:54:46,355 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:54:58,368 INFO L134 CoverageAnalysis]: Checked inductivity of 10170 backedges. 4140 proven. 2070 refuted. 0 times theorem prover too weak. 3960 trivial. 0 not checked. [2020-07-21 01:54:58,369 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [267362265] [2020-07-21 01:54:58,369 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:54:58,369 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [94, 94] total 140 [2020-07-21 01:54:58,369 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [836285629] [2020-07-21 01:54:58,370 INFO L459 AbstractCegarLoop]: Interpolant automaton has 140 states [2020-07-21 01:54:58,370 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:54:58,371 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 140 interpolants. [2020-07-21 01:54:58,371 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4463, Invalid=14997, Unknown=0, NotChecked=0, Total=19460 [2020-07-21 01:54:58,372 INFO L87 Difference]: Start difference. First operand 382 states and 407 transitions. Second operand 140 states. [2020-07-21 01:55:11,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:55:11,235 INFO L93 Difference]: Finished difference Result 759 states and 922 transitions. [2020-07-21 01:55:11,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2020-07-21 01:55:11,235 INFO L78 Accepts]: Start accepts. Automaton has 140 states. Word has length 467 [2020-07-21 01:55:11,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:55:11,238 INFO L225 Difference]: With dead ends: 759 [2020-07-21 01:55:11,238 INFO L226 Difference]: Without dead ends: 568 [2020-07-21 01:55:11,240 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 979 GetRequests, 749 SyntacticMatches, 46 SemanticMatches, 184 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9270 ImplicationChecksByTransitivity, 26.8s TimeCoverageRelationStatistics Valid=8833, Invalid=25577, Unknown=0, NotChecked=0, Total=34410 [2020-07-21 01:55:11,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 568 states. [2020-07-21 01:55:11,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 568 to 384. [2020-07-21 01:55:11,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 384 states. [2020-07-21 01:55:11,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 384 states to 384 states and 409 transitions. [2020-07-21 01:55:11,257 INFO L78 Accepts]: Start accepts. Automaton has 384 states and 409 transitions. Word has length 467 [2020-07-21 01:55:11,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:55:11,258 INFO L479 AbstractCegarLoop]: Abstraction has 384 states and 409 transitions. [2020-07-21 01:55:11,258 INFO L480 AbstractCegarLoop]: Interpolant automaton has 140 states. [2020-07-21 01:55:11,258 INFO L276 IsEmpty]: Start isEmpty. Operand 384 states and 409 transitions. [2020-07-21 01:55:11,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 470 [2020-07-21 01:55:11,260 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:55:11,260 INFO L422 BasicCegarLoop]: trace histogram [47, 46, 46, 46, 46, 45, 45, 45, 45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:55:11,460 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 71 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:55:11,461 INFO L427 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:55:11,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:55:11,462 INFO L82 PathProgramCache]: Analyzing trace with hash 1949894242, now seen corresponding path program 68 times [2020-07-21 01:55:11,462 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:55:11,462 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [807601560] [2020-07-21 01:55:11,462 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 72 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:55:11,676 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:55:11,676 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:55:11,681 INFO L263 TraceCheckSpWp]: Trace formula consists of 1268 conjuncts, 95 conjunts are in the unsatisfiable core [2020-07-21 01:55:11,686 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:55:15,144 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 01:55:15,424 INFO L134 CoverageAnalysis]: Checked inductivity of 10262 backedges. 2252 proven. 4050 refuted. 0 times theorem prover too weak. 3960 trivial. 0 not checked. [2020-07-21 01:55:15,424 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:55:15,577 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:55:22,567 INFO L134 CoverageAnalysis]: Checked inductivity of 10262 backedges. 2252 proven. 4050 refuted. 0 times theorem prover too weak. 3960 trivial. 0 not checked. [2020-07-21 01:55:22,567 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [807601560] [2020-07-21 01:55:22,567 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:55:22,568 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51] total 52 [2020-07-21 01:55:22,568 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1253968655] [2020-07-21 01:55:22,568 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2020-07-21 01:55:22,568 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:55:22,569 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2020-07-21 01:55:22,569 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1229, Invalid=1423, Unknown=0, NotChecked=0, Total=2652 [2020-07-21 01:55:22,569 INFO L87 Difference]: Start difference. First operand 384 states and 409 transitions. Second operand 52 states. [2020-07-21 01:55:24,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:55:24,097 INFO L93 Difference]: Finished difference Result 403 states and 430 transitions. [2020-07-21 01:55:24,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-07-21 01:55:24,100 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 469 [2020-07-21 01:55:24,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:55:24,103 INFO L225 Difference]: With dead ends: 403 [2020-07-21 01:55:24,103 INFO L226 Difference]: Without dead ends: 401 [2020-07-21 01:55:24,103 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 938 GetRequests, 795 SyntacticMatches, 92 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2437 ImplicationChecksByTransitivity, 10.0s TimeCoverageRelationStatistics Valid=1233, Invalid=1523, Unknown=0, NotChecked=0, Total=2756 [2020-07-21 01:55:24,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 401 states. [2020-07-21 01:55:24,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 401 to 396. [2020-07-21 01:55:24,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 396 states. [2020-07-21 01:55:24,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 396 states to 396 states and 422 transitions. [2020-07-21 01:55:24,119 INFO L78 Accepts]: Start accepts. Automaton has 396 states and 422 transitions. Word has length 469 [2020-07-21 01:55:24,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:55:24,119 INFO L479 AbstractCegarLoop]: Abstraction has 396 states and 422 transitions. [2020-07-21 01:55:24,119 INFO L480 AbstractCegarLoop]: Interpolant automaton has 52 states. [2020-07-21 01:55:24,119 INFO L276 IsEmpty]: Start isEmpty. Operand 396 states and 422 transitions. [2020-07-21 01:55:24,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 486 [2020-07-21 01:55:24,121 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:55:24,122 INFO L422 BasicCegarLoop]: trace histogram [48, 48, 48, 47, 47, 47, 47, 47, 47, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:55:24,322 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 72 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:55:24,323 INFO L427 AbstractCegarLoop]: === Iteration 72 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:55:24,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:55:24,324 INFO L82 PathProgramCache]: Analyzing trace with hash 676537412, now seen corresponding path program 69 times [2020-07-21 01:55:24,324 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:55:24,324 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1782339692] [2020-07-21 01:55:24,325 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 73 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 73 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:55:24,547 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:55:24,547 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:55:24,553 INFO L263 TraceCheckSpWp]: Trace formula consists of 1302 conjuncts, 96 conjunts are in the unsatisfiable core [2020-07-21 01:55:24,557 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:55:35,552 INFO L134 CoverageAnalysis]: Checked inductivity of 10998 backedges. 4692 proven. 2162 refuted. 0 times theorem prover too weak. 4144 trivial. 0 not checked. [2020-07-21 01:55:35,552 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:55:49,007 INFO L134 CoverageAnalysis]: Checked inductivity of 10998 backedges. 4510 proven. 2162 refuted. 0 times theorem prover too weak. 4326 trivial. 0 not checked. [2020-07-21 01:55:49,008 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1782339692] [2020-07-21 01:55:49,008 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:55:49,008 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [96, 96] total 143 [2020-07-21 01:55:49,008 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1342515641] [2020-07-21 01:55:49,009 INFO L459 AbstractCegarLoop]: Interpolant automaton has 143 states [2020-07-21 01:55:49,009 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:55:49,010 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 143 interpolants. [2020-07-21 01:55:49,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4654, Invalid=15652, Unknown=0, NotChecked=0, Total=20306 [2020-07-21 01:55:49,012 INFO L87 Difference]: Start difference. First operand 396 states and 422 transitions. Second operand 143 states. [2020-07-21 01:56:03,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:56:03,462 INFO L93 Difference]: Finished difference Result 787 states and 954 transitions. [2020-07-21 01:56:03,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2020-07-21 01:56:03,462 INFO L78 Accepts]: Start accepts. Automaton has 143 states. Word has length 485 [2020-07-21 01:56:03,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:56:03,464 INFO L225 Difference]: With dead ends: 787 [2020-07-21 01:56:03,465 INFO L226 Difference]: Without dead ends: 586 [2020-07-21 01:56:03,467 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1016 GetRequests, 781 SyntacticMatches, 47 SemanticMatches, 188 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9683 ImplicationChecksByTransitivity, 29.8s TimeCoverageRelationStatistics Valid=9213, Invalid=26697, Unknown=0, NotChecked=0, Total=35910 [2020-07-21 01:56:03,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 586 states. [2020-07-21 01:56:03,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 586 to 398. [2020-07-21 01:56:03,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 398 states. [2020-07-21 01:56:03,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 398 states to 398 states and 424 transitions. [2020-07-21 01:56:03,483 INFO L78 Accepts]: Start accepts. Automaton has 398 states and 424 transitions. Word has length 485 [2020-07-21 01:56:03,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:56:03,483 INFO L479 AbstractCegarLoop]: Abstraction has 398 states and 424 transitions. [2020-07-21 01:56:03,483 INFO L480 AbstractCegarLoop]: Interpolant automaton has 143 states. [2020-07-21 01:56:03,483 INFO L276 IsEmpty]: Start isEmpty. Operand 398 states and 424 transitions. [2020-07-21 01:56:03,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 488 [2020-07-21 01:56:03,486 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:56:03,486 INFO L422 BasicCegarLoop]: trace histogram [48, 48, 48, 48, 47, 47, 47, 47, 47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:56:03,686 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 73 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:56:03,687 INFO L427 AbstractCegarLoop]: === Iteration 73 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:56:03,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:56:03,688 INFO L82 PathProgramCache]: Analyzing trace with hash 579393385, now seen corresponding path program 70 times [2020-07-21 01:56:03,688 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:56:03,688 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1914841600] [2020-07-21 01:56:03,688 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 74 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 74 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:56:03,913 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:56:03,914 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:56:03,919 INFO L263 TraceCheckSpWp]: Trace formula consists of 1312 conjuncts, 98 conjunts are in the unsatisfiable core [2020-07-21 01:56:03,923 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:56:16,335 INFO L134 CoverageAnalysis]: Checked inductivity of 11092 backedges. 4512 proven. 2256 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2020-07-21 01:56:16,336 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:56:30,405 INFO L134 CoverageAnalysis]: Checked inductivity of 11092 backedges. 4512 proven. 2256 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2020-07-21 01:56:30,405 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1914841600] [2020-07-21 01:56:30,405 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:56:30,405 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [98, 98] total 146 [2020-07-21 01:56:30,406 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1733235535] [2020-07-21 01:56:30,406 INFO L459 AbstractCegarLoop]: Interpolant automaton has 146 states [2020-07-21 01:56:30,406 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:56:30,407 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 146 interpolants. [2020-07-21 01:56:30,408 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4849, Invalid=16321, Unknown=0, NotChecked=0, Total=21170 [2020-07-21 01:56:30,408 INFO L87 Difference]: Start difference. First operand 398 states and 424 transitions. Second operand 146 states. [2020-07-21 01:56:45,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:56:45,650 INFO L93 Difference]: Finished difference Result 791 states and 961 transitions. [2020-07-21 01:56:45,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2020-07-21 01:56:45,650 INFO L78 Accepts]: Start accepts. Automaton has 146 states. Word has length 487 [2020-07-21 01:56:45,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:56:45,653 INFO L225 Difference]: With dead ends: 791 [2020-07-21 01:56:45,653 INFO L226 Difference]: Without dead ends: 592 [2020-07-21 01:56:45,656 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1021 GetRequests, 781 SyntacticMatches, 48 SemanticMatches, 192 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10105 ImplicationChecksByTransitivity, 31.9s TimeCoverageRelationStatistics Valid=9601, Invalid=27841, Unknown=0, NotChecked=0, Total=37442 [2020-07-21 01:56:45,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 592 states. [2020-07-21 01:56:45,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 592 to 400. [2020-07-21 01:56:45,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 400 states. [2020-07-21 01:56:45,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 400 states to 400 states and 426 transitions. [2020-07-21 01:56:45,676 INFO L78 Accepts]: Start accepts. Automaton has 400 states and 426 transitions. Word has length 487 [2020-07-21 01:56:45,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:56:45,676 INFO L479 AbstractCegarLoop]: Abstraction has 400 states and 426 transitions. [2020-07-21 01:56:45,676 INFO L480 AbstractCegarLoop]: Interpolant automaton has 146 states. [2020-07-21 01:56:45,677 INFO L276 IsEmpty]: Start isEmpty. Operand 400 states and 426 transitions. [2020-07-21 01:56:45,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 490 [2020-07-21 01:56:45,679 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:56:45,679 INFO L422 BasicCegarLoop]: trace histogram [49, 48, 48, 48, 48, 47, 47, 47, 47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:56:45,879 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 74 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:56:45,880 INFO L427 AbstractCegarLoop]: === Iteration 74 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:56:45,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:56:45,881 INFO L82 PathProgramCache]: Analyzing trace with hash 1713263950, now seen corresponding path program 71 times [2020-07-21 01:56:45,881 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:56:45,881 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2006338964] [2020-07-21 01:56:45,881 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 75 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 75 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:56:46,090 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:56:46,090 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:56:46,096 INFO L263 TraceCheckSpWp]: Trace formula consists of 1322 conjuncts, 99 conjunts are in the unsatisfiable core [2020-07-21 01:56:46,100 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:56:50,112 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 01:56:50,423 INFO L134 CoverageAnalysis]: Checked inductivity of 11188 backedges. 2446 proven. 4418 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2020-07-21 01:56:50,424 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:56:50,591 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:56:58,714 INFO L134 CoverageAnalysis]: Checked inductivity of 11188 backedges. 2446 proven. 4418 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2020-07-21 01:56:58,714 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2006338964] [2020-07-21 01:56:58,714 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:56:58,715 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53] total 54 [2020-07-21 01:56:58,715 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1023798018] [2020-07-21 01:56:58,715 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2020-07-21 01:56:58,715 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:56:58,716 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2020-07-21 01:56:58,716 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1330, Invalid=1532, Unknown=0, NotChecked=0, Total=2862 [2020-07-21 01:56:58,716 INFO L87 Difference]: Start difference. First operand 400 states and 426 transitions. Second operand 54 states. [2020-07-21 01:57:00,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:57:00,459 INFO L93 Difference]: Finished difference Result 419 states and 447 transitions. [2020-07-21 01:57:00,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-07-21 01:57:00,462 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 489 [2020-07-21 01:57:00,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:57:00,465 INFO L225 Difference]: With dead ends: 419 [2020-07-21 01:57:00,465 INFO L226 Difference]: Without dead ends: 417 [2020-07-21 01:57:00,466 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 978 GetRequests, 829 SyntacticMatches, 96 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2639 ImplicationChecksByTransitivity, 11.6s TimeCoverageRelationStatistics Valid=1334, Invalid=1636, Unknown=0, NotChecked=0, Total=2970 [2020-07-21 01:57:00,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 417 states. [2020-07-21 01:57:00,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 417 to 412. [2020-07-21 01:57:00,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 412 states. [2020-07-21 01:57:00,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 412 states to 412 states and 439 transitions. [2020-07-21 01:57:00,483 INFO L78 Accepts]: Start accepts. Automaton has 412 states and 439 transitions. Word has length 489 [2020-07-21 01:57:00,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:57:00,483 INFO L479 AbstractCegarLoop]: Abstraction has 412 states and 439 transitions. [2020-07-21 01:57:00,483 INFO L480 AbstractCegarLoop]: Interpolant automaton has 54 states. [2020-07-21 01:57:00,483 INFO L276 IsEmpty]: Start isEmpty. Operand 412 states and 439 transitions. [2020-07-21 01:57:00,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 506 [2020-07-21 01:57:00,486 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:57:00,486 INFO L422 BasicCegarLoop]: trace histogram [50, 50, 50, 49, 49, 49, 49, 49, 49, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:57:00,686 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 75 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:57:00,687 INFO L427 AbstractCegarLoop]: === Iteration 75 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:57:00,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:57:00,688 INFO L82 PathProgramCache]: Analyzing trace with hash -831186128, now seen corresponding path program 72 times [2020-07-21 01:57:00,688 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:57:00,688 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1815621889] [2020-07-21 01:57:00,688 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 76 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 76 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:57:00,900 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:57:00,901 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:57:00,907 INFO L263 TraceCheckSpWp]: Trace formula consists of 1356 conjuncts, 100 conjunts are in the unsatisfiable core [2020-07-21 01:57:00,911 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:57:13,770 INFO L134 CoverageAnalysis]: Checked inductivity of 11956 backedges. 5088 proven. 2352 refuted. 0 times theorem prover too weak. 4516 trivial. 0 not checked. [2020-07-21 01:57:13,771 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:57:30,140 INFO L134 CoverageAnalysis]: Checked inductivity of 11956 backedges. 4898 proven. 2352 refuted. 0 times theorem prover too weak. 4706 trivial. 0 not checked. [2020-07-21 01:57:30,141 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1815621889] [2020-07-21 01:57:30,141 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:57:30,141 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [100, 100] total 149 [2020-07-21 01:57:30,141 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1909264089] [2020-07-21 01:57:30,142 INFO L459 AbstractCegarLoop]: Interpolant automaton has 149 states [2020-07-21 01:57:30,142 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:57:30,143 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 149 interpolants. [2020-07-21 01:57:30,143 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5048, Invalid=17004, Unknown=0, NotChecked=0, Total=22052 [2020-07-21 01:57:30,144 INFO L87 Difference]: Start difference. First operand 412 states and 439 transitions. Second operand 149 states. [2020-07-21 01:57:48,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:57:48,525 INFO L93 Difference]: Finished difference Result 819 states and 993 transitions. [2020-07-21 01:57:48,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2020-07-21 01:57:48,525 INFO L78 Accepts]: Start accepts. Automaton has 149 states. Word has length 505 [2020-07-21 01:57:48,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:57:48,528 INFO L225 Difference]: With dead ends: 819 [2020-07-21 01:57:48,528 INFO L226 Difference]: Without dead ends: 610 [2020-07-21 01:57:48,531 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1058 GetRequests, 813 SyntacticMatches, 49 SemanticMatches, 196 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10536 ImplicationChecksByTransitivity, 36.2s TimeCoverageRelationStatistics Valid=9997, Invalid=29009, Unknown=0, NotChecked=0, Total=39006 [2020-07-21 01:57:48,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 610 states. [2020-07-21 01:57:48,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 610 to 414. [2020-07-21 01:57:48,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 414 states. [2020-07-21 01:57:48,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 414 states to 414 states and 441 transitions. [2020-07-21 01:57:48,551 INFO L78 Accepts]: Start accepts. Automaton has 414 states and 441 transitions. Word has length 505 [2020-07-21 01:57:48,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:57:48,551 INFO L479 AbstractCegarLoop]: Abstraction has 414 states and 441 transitions. [2020-07-21 01:57:48,551 INFO L480 AbstractCegarLoop]: Interpolant automaton has 149 states. [2020-07-21 01:57:48,551 INFO L276 IsEmpty]: Start isEmpty. Operand 414 states and 441 transitions. [2020-07-21 01:57:48,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 508 [2020-07-21 01:57:48,555 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:57:48,555 INFO L422 BasicCegarLoop]: trace histogram [50, 50, 50, 50, 49, 49, 49, 49, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:57:48,755 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 76 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:57:48,756 INFO L427 AbstractCegarLoop]: === Iteration 76 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:57:48,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:57:48,757 INFO L82 PathProgramCache]: Analyzing trace with hash 1643039189, now seen corresponding path program 73 times [2020-07-21 01:57:48,757 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:57:48,757 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2077319494] [2020-07-21 01:57:48,758 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 77 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 77 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:57:48,994 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:57:48,995 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:57:49,000 INFO L263 TraceCheckSpWp]: Trace formula consists of 1366 conjuncts, 102 conjunts are in the unsatisfiable core [2020-07-21 01:57:49,004 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:58:05,453 INFO L134 CoverageAnalysis]: Checked inductivity of 12054 backedges. 4900 proven. 2450 refuted. 0 times theorem prover too weak. 4704 trivial. 0 not checked. [2020-07-21 01:58:05,454 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:58:25,082 INFO L134 CoverageAnalysis]: Checked inductivity of 12054 backedges. 4900 proven. 2450 refuted. 0 times theorem prover too weak. 4704 trivial. 0 not checked. [2020-07-21 01:58:25,083 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2077319494] [2020-07-21 01:58:25,083 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:58:25,083 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [102, 102] total 152 [2020-07-21 01:58:25,083 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1627865802] [2020-07-21 01:58:25,084 INFO L459 AbstractCegarLoop]: Interpolant automaton has 152 states [2020-07-21 01:58:25,084 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:58:25,085 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 152 interpolants. [2020-07-21 01:58:25,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5251, Invalid=17701, Unknown=0, NotChecked=0, Total=22952 [2020-07-21 01:58:25,086 INFO L87 Difference]: Start difference. First operand 414 states and 441 transitions. Second operand 152 states. [2020-07-21 01:58:46,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:58:46,016 INFO L93 Difference]: Finished difference Result 823 states and 1000 transitions. [2020-07-21 01:58:46,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2020-07-21 01:58:46,017 INFO L78 Accepts]: Start accepts. Automaton has 152 states. Word has length 507 [2020-07-21 01:58:46,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:58:46,020 INFO L225 Difference]: With dead ends: 823 [2020-07-21 01:58:46,020 INFO L226 Difference]: Without dead ends: 616 [2020-07-21 01:58:46,024 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1063 GetRequests, 813 SyntacticMatches, 50 SemanticMatches, 200 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10976 ImplicationChecksByTransitivity, 43.5s TimeCoverageRelationStatistics Valid=10401, Invalid=30201, Unknown=0, NotChecked=0, Total=40602 [2020-07-21 01:58:46,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 616 states. [2020-07-21 01:58:46,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 616 to 416. [2020-07-21 01:58:46,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 416 states. [2020-07-21 01:58:46,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 416 states to 416 states and 443 transitions. [2020-07-21 01:58:46,050 INFO L78 Accepts]: Start accepts. Automaton has 416 states and 443 transitions. Word has length 507 [2020-07-21 01:58:46,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:58:46,051 INFO L479 AbstractCegarLoop]: Abstraction has 416 states and 443 transitions. [2020-07-21 01:58:46,051 INFO L480 AbstractCegarLoop]: Interpolant automaton has 152 states. [2020-07-21 01:58:46,051 INFO L276 IsEmpty]: Start isEmpty. Operand 416 states and 443 transitions. [2020-07-21 01:58:46,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 510 [2020-07-21 01:58:46,055 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:58:46,055 INFO L422 BasicCegarLoop]: trace histogram [51, 50, 50, 50, 50, 49, 49, 49, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:58:46,270 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 77 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:58:46,271 INFO L427 AbstractCegarLoop]: === Iteration 77 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:58:46,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:58:46,272 INFO L82 PathProgramCache]: Analyzing trace with hash -38313158, now seen corresponding path program 74 times [2020-07-21 01:58:46,272 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:58:46,273 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1370525558] [2020-07-21 01:58:46,273 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 78 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 78 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:58:46,505 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:58:46,505 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:58:46,512 INFO L263 TraceCheckSpWp]: Trace formula consists of 1376 conjuncts, 103 conjunts are in the unsatisfiable core [2020-07-21 01:58:46,517 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:58:51,650 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 01:58:52,023 INFO L134 CoverageAnalysis]: Checked inductivity of 12154 backedges. 2648 proven. 4802 refuted. 0 times theorem prover too weak. 4704 trivial. 0 not checked. [2020-07-21 01:58:52,024 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:58:52,237 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:59:03,533 INFO L134 CoverageAnalysis]: Checked inductivity of 12154 backedges. 2648 proven. 4802 refuted. 0 times theorem prover too weak. 4704 trivial. 0 not checked. [2020-07-21 01:59:03,533 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1370525558] [2020-07-21 01:59:03,533 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:59:03,534 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55] total 56 [2020-07-21 01:59:03,534 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [160482301] [2020-07-21 01:59:03,534 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2020-07-21 01:59:03,534 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:59:03,535 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2020-07-21 01:59:03,535 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1435, Invalid=1645, Unknown=0, NotChecked=0, Total=3080 [2020-07-21 01:59:03,535 INFO L87 Difference]: Start difference. First operand 416 states and 443 transitions. Second operand 56 states. [2020-07-21 01:59:05,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:59:05,951 INFO L93 Difference]: Finished difference Result 435 states and 464 transitions. [2020-07-21 01:59:05,956 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2020-07-21 01:59:05,956 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 509 [2020-07-21 01:59:05,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:59:05,960 INFO L225 Difference]: With dead ends: 435 [2020-07-21 01:59:05,960 INFO L226 Difference]: Without dead ends: 433 [2020-07-21 01:59:05,961 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1018 GetRequests, 863 SyntacticMatches, 100 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2849 ImplicationChecksByTransitivity, 15.6s TimeCoverageRelationStatistics Valid=1439, Invalid=1753, Unknown=0, NotChecked=0, Total=3192 [2020-07-21 01:59:05,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 433 states. [2020-07-21 01:59:05,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 433 to 428. [2020-07-21 01:59:05,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 428 states. [2020-07-21 01:59:05,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 428 states to 428 states and 456 transitions. [2020-07-21 01:59:05,984 INFO L78 Accepts]: Start accepts. Automaton has 428 states and 456 transitions. Word has length 509 [2020-07-21 01:59:05,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:59:05,984 INFO L479 AbstractCegarLoop]: Abstraction has 428 states and 456 transitions. [2020-07-21 01:59:05,984 INFO L480 AbstractCegarLoop]: Interpolant automaton has 56 states. [2020-07-21 01:59:05,985 INFO L276 IsEmpty]: Start isEmpty. Operand 428 states and 456 transitions. [2020-07-21 01:59:05,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 526 [2020-07-21 01:59:05,987 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:59:05,987 INFO L422 BasicCegarLoop]: trace histogram [52, 52, 52, 51, 51, 51, 51, 51, 51, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:59:06,187 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 78 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:59:06,188 INFO L427 AbstractCegarLoop]: === Iteration 78 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:59:06,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:59:06,189 INFO L82 PathProgramCache]: Analyzing trace with hash 283955484, now seen corresponding path program 75 times [2020-07-21 01:59:06,190 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:59:06,190 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1870561377] [2020-07-21 01:59:06,190 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 79 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 79 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:59:06,401 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:59:06,402 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:59:06,408 INFO L263 TraceCheckSpWp]: Trace formula consists of 1410 conjuncts, 104 conjunts are in the unsatisfiable core [2020-07-21 01:59:06,414 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:59:23,273 INFO L134 CoverageAnalysis]: Checked inductivity of 12954 backedges. 5500 proven. 2550 refuted. 0 times theorem prover too weak. 4904 trivial. 0 not checked. [2020-07-21 01:59:23,273 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:59:43,618 INFO L134 CoverageAnalysis]: Checked inductivity of 12954 backedges. 5302 proven. 2550 refuted. 0 times theorem prover too weak. 5102 trivial. 0 not checked. [2020-07-21 01:59:43,619 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1870561377] [2020-07-21 01:59:43,619 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:59:43,619 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [104, 104] total 155 [2020-07-21 01:59:43,619 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1122341803] [2020-07-21 01:59:43,620 INFO L459 AbstractCegarLoop]: Interpolant automaton has 155 states [2020-07-21 01:59:43,620 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:59:43,621 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 155 interpolants. [2020-07-21 01:59:43,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5458, Invalid=18412, Unknown=0, NotChecked=0, Total=23870 [2020-07-21 01:59:43,622 INFO L87 Difference]: Start difference. First operand 428 states and 456 transitions. Second operand 155 states. [2020-07-21 02:00:06,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 02:00:06,910 INFO L93 Difference]: Finished difference Result 851 states and 1032 transitions. [2020-07-21 02:00:06,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2020-07-21 02:00:06,910 INFO L78 Accepts]: Start accepts. Automaton has 155 states. Word has length 525 [2020-07-21 02:00:06,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 02:00:06,913 INFO L225 Difference]: With dead ends: 851 [2020-07-21 02:00:06,913 INFO L226 Difference]: Without dead ends: 634 [2020-07-21 02:00:06,917 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1100 GetRequests, 845 SyntacticMatches, 51 SemanticMatches, 204 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11425 ImplicationChecksByTransitivity, 45.7s TimeCoverageRelationStatistics Valid=10813, Invalid=31417, Unknown=0, NotChecked=0, Total=42230 [2020-07-21 02:00:06,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 634 states. [2020-07-21 02:00:06,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 634 to 430. [2020-07-21 02:00:06,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 430 states. [2020-07-21 02:00:06,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 430 states to 430 states and 458 transitions. [2020-07-21 02:00:06,951 INFO L78 Accepts]: Start accepts. Automaton has 430 states and 458 transitions. Word has length 525 [2020-07-21 02:00:06,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 02:00:06,951 INFO L479 AbstractCegarLoop]: Abstraction has 430 states and 458 transitions. [2020-07-21 02:00:06,951 INFO L480 AbstractCegarLoop]: Interpolant automaton has 155 states. [2020-07-21 02:00:06,951 INFO L276 IsEmpty]: Start isEmpty. Operand 430 states and 458 transitions. [2020-07-21 02:00:06,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 528 [2020-07-21 02:00:06,956 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 02:00:06,957 INFO L422 BasicCegarLoop]: trace histogram [52, 52, 52, 52, 51, 51, 51, 51, 51, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 02:00:07,171 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 79 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 02:00:07,172 INFO L427 AbstractCegarLoop]: === Iteration 79 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 02:00:07,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 02:00:07,173 INFO L82 PathProgramCache]: Analyzing trace with hash 1129954113, now seen corresponding path program 76 times [2020-07-21 02:00:07,173 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 02:00:07,174 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1867521646] [2020-07-21 02:00:07,174 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 80 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 80 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 02:00:07,393 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 02:00:07,393 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 02:00:07,399 INFO L263 TraceCheckSpWp]: Trace formula consists of 1420 conjuncts, 106 conjunts are in the unsatisfiable core [2020-07-21 02:00:07,405 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 02:00:26,749 INFO L134 CoverageAnalysis]: Checked inductivity of 13056 backedges. 5304 proven. 2652 refuted. 0 times theorem prover too weak. 5100 trivial. 0 not checked. [2020-07-21 02:00:26,750 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 02:00:50,768 INFO L134 CoverageAnalysis]: Checked inductivity of 13056 backedges. 5304 proven. 2652 refuted. 0 times theorem prover too weak. 5100 trivial. 0 not checked. [2020-07-21 02:00:50,769 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1867521646] [2020-07-21 02:00:50,769 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 02:00:50,770 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [106, 106] total 158 [2020-07-21 02:00:50,770 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [681228727] [2020-07-21 02:00:50,771 INFO L459 AbstractCegarLoop]: Interpolant automaton has 158 states [2020-07-21 02:00:50,771 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 02:00:50,771 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 158 interpolants. [2020-07-21 02:00:50,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5669, Invalid=19137, Unknown=0, NotChecked=0, Total=24806 [2020-07-21 02:00:50,773 INFO L87 Difference]: Start difference. First operand 430 states and 458 transitions. Second operand 158 states.