/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 NOT_INCREMENTALLY -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/sumt8.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 12:08:33,756 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 12:08:33,758 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 12:08:33,780 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 12:08:33,781 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 12:08:33,783 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 12:08:33,785 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 12:08:33,796 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 12:08:33,800 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 12:08:33,805 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 12:08:33,806 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 12:08:33,808 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 12:08:33,808 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 12:08:33,811 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 12:08:33,813 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 12:08:33,814 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 12:08:33,816 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 12:08:33,817 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 12:08:33,818 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 12:08:33,824 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 12:08:33,829 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 12:08:33,835 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 12:08:33,836 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 12:08:33,837 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 12:08:33,839 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 12:08:33,846 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 12:08:33,846 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 12:08:33,847 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 12:08:33,848 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 12:08:33,865 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 12:08:33,865 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 12:08:33,866 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 12:08:33,867 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 12:08:33,867 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 12:08:33,867 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 12:08:33,867 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 12:08:33,868 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 12:08:33,868 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 12:08:33,868 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 12:08:33,868 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 12:08:33,868 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 12:08:33,869 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 12:08:33,869 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 12:08:33,869 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 12:08:33,869 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 12:08:33,869 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 12:08:33,870 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 12:08:33,870 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 12:08:33,870 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 12:08:33,870 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 12:08:33,871 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 12:08:33,871 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 12:08:33,871 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 12:08:33,871 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 12:08:33,871 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 12:08:33,872 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 12:08:33,872 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 12:08:33,872 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 12:08:33,872 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 -> NOT_INCREMENTALLY [2020-07-21 12:08:34,203 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 12:08:34,220 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 12:08:34,224 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 12:08:34,226 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 12:08:34,227 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 12:08:34,228 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/sumt8.c [2020-07-21 12:08:34,323 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/19116b852/13644f618b244243b0db13f12034b9f0/FLAG471ea9d7f [2020-07-21 12:08:34,860 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 12:08:34,861 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/sumt8.c [2020-07-21 12:08:34,869 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/19116b852/13644f618b244243b0db13f12034b9f0/FLAG471ea9d7f [2020-07-21 12:08:35,230 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/19116b852/13644f618b244243b0db13f12034b9f0 [2020-07-21 12:08:35,242 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 12:08:35,246 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 12:08:35,248 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 12:08:35,248 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 12:08:35,252 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 12:08:35,253 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 12:08:35" (1/1) ... [2020-07-21 12:08:35,257 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4ca3bae2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:08:35, skipping insertion in model container [2020-07-21 12:08:35,257 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 12:08:35" (1/1) ... [2020-07-21 12:08:35,266 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 12:08:35,287 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 12:08:35,478 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 12:08:35,483 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 12:08:35,509 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 12:08:35,528 INFO L208 MainTranslator]: Completed translation [2020-07-21 12:08:35,529 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:08:35 WrapperNode [2020-07-21 12:08:35,529 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 12:08:35,530 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 12:08:35,530 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 12:08:35,530 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 12:08:35,544 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:08:35" (1/1) ... [2020-07-21 12:08:35,544 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:08:35" (1/1) ... [2020-07-21 12:08:35,550 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:08:35" (1/1) ... [2020-07-21 12:08:35,551 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:08:35" (1/1) ... [2020-07-21 12:08:35,655 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:08:35" (1/1) ... [2020-07-21 12:08:35,660 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:08:35" (1/1) ... [2020-07-21 12:08:35,662 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:08:35" (1/1) ... [2020-07-21 12:08:35,664 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 12:08:35,664 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 12:08:35,665 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 12:08:35,665 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 12:08:35,666 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:08:35" (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 12:08:35,744 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 12:08:35,744 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 12:08:35,744 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 12:08:35,745 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 12:08:35,745 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 12:08:35,745 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 12:08:35,745 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 12:08:35,746 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 12:08:35,747 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 12:08:35,747 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 12:08:35,747 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 12:08:35,748 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 12:08:35,748 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 12:08:36,104 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 12:08:36,105 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 12:08:36,110 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 12:08:36 BoogieIcfgContainer [2020-07-21 12:08:36,110 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 12:08:36,112 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 12:08:36,112 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 12:08:36,116 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 12:08:36,117 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 12:08:35" (1/3) ... [2020-07-21 12:08:36,118 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4a4ada2b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 12:08:36, skipping insertion in model container [2020-07-21 12:08:36,118 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:08:35" (2/3) ... [2020-07-21 12:08:36,119 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4a4ada2b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 12:08:36, skipping insertion in model container [2020-07-21 12:08:36,119 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 12:08:36" (3/3) ... [2020-07-21 12:08:36,121 INFO L109 eAbstractionObserver]: Analyzing ICFG sumt8.c [2020-07-21 12:08:36,134 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 12:08:36,143 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 12:08:36,160 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 12:08:36,191 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 12:08:36,191 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 12:08:36,191 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 12:08:36,191 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 12:08:36,192 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 12:08:36,192 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 12:08:36,192 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 12:08:36,193 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 12:08:36,218 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states. [2020-07-21 12:08:36,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 12:08:36,226 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 12:08:36,227 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 12:08:36,228 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 12:08:36,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 12:08:36,235 INFO L82 PathProgramCache]: Analyzing trace with hash -1078562183, now seen corresponding path program 1 times [2020-07-21 12:08:36,245 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 12:08:36,246 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [16773903] [2020-07-21 12:08:36,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 12:08:36,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 12:08:36,339 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 25 conjunts are in the unsatisfiable core [2020-07-21 12:08:36,346 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 12:08:36,564 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 12:08:36,564 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 12:08:36,566 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [16773903] [2020-07-21 12:08:36,567 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 12:08:36,567 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-07-21 12:08:36,569 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [850572959] [2020-07-21 12:08:36,575 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-21 12:08:36,576 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 12:08:36,588 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-21 12:08:36,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-07-21 12:08:36,591 INFO L87 Difference]: Start difference. First operand 28 states. Second operand 7 states. [2020-07-21 12:08:36,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 12:08:36,938 INFO L93 Difference]: Finished difference Result 71 states and 105 transitions. [2020-07-21 12:08:36,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 12:08:36,942 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-07-21 12:08:36,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 12:08:36,963 INFO L225 Difference]: With dead ends: 71 [2020-07-21 12:08:36,963 INFO L226 Difference]: Without dead ends: 39 [2020-07-21 12:08:36,972 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2020-07-21 12:08:36,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-07-21 12:08:37,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-07-21 12:08:37,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-07-21 12:08:37,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 46 transitions. [2020-07-21 12:08:37,017 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 46 transitions. Word has length 14 [2020-07-21 12:08:37,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 12:08:37,018 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 46 transitions. [2020-07-21 12:08:37,018 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-21 12:08:37,018 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 46 transitions. [2020-07-21 12:08:37,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-21 12:08:37,020 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 12:08:37,020 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, 1] [2020-07-21 12:08:37,224 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 12:08:37,225 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 12:08:37,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 12:08:37,226 INFO L82 PathProgramCache]: Analyzing trace with hash -858115487, now seen corresponding path program 1 times [2020-07-21 12:08:37,227 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 12:08:37,227 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1563783135] [2020-07-21 12:08:37,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 12:08:37,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 12:08:37,272 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 29 conjunts are in the unsatisfiable core [2020-07-21 12:08:37,275 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 12:08:37,501 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 12:08:37,501 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 12:08:37,546 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 12:08:37,770 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 12:08:37,771 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1563783135] [2020-07-21 12:08:37,771 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2020-07-21 12:08:37,771 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9] total 11 [2020-07-21 12:08:37,772 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1309663397] [2020-07-21 12:08:37,774 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 12:08:37,774 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 12:08:37,775 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 12:08:37,775 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2020-07-21 12:08:37,775 INFO L87 Difference]: Start difference. First operand 39 states and 46 transitions. Second operand 6 states. [2020-07-21 12:08:50,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 12:08:50,570 INFO L93 Difference]: Finished difference Result 55 states and 69 transitions. [2020-07-21 12:08:50,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 12:08:50,571 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 28 [2020-07-21 12:08:50,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 12:08:50,574 INFO L225 Difference]: With dead ends: 55 [2020-07-21 12:08:50,574 INFO L226 Difference]: Without dead ends: 53 [2020-07-21 12:08:50,576 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 41 SyntacticMatches, 5 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2020-07-21 12:08:50,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-21 12:08:50,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-07-21 12:08:50,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-07-21 12:08:50,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 67 transitions. [2020-07-21 12:08:50,587 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 67 transitions. Word has length 28 [2020-07-21 12:08:50,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 12:08:50,588 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 67 transitions. [2020-07-21 12:08:50,588 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 12:08:50,588 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 67 transitions. [2020-07-21 12:08:50,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-07-21 12:08:50,590 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 12:08:50,590 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 12:08:50,791 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 12:08:50,791 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 12:08:50,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 12:08:50,793 INFO L82 PathProgramCache]: Analyzing trace with hash -1617304246, now seen corresponding path program 1 times [2020-07-21 12:08:50,793 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 12:08:50,794 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1702566355] [2020-07-21 12:08:50,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 12:08:50,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 12:08:50,841 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 33 conjunts are in the unsatisfiable core [2020-07-21 12:08:50,844 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 12:08:51,097 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 13 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 12:08:51,098 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 12:08:51,134 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 12:08:53,796 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 5 proven. 0 refuted. 6 times theorem prover too weak. 10 trivial. 0 not checked. [2020-07-21 12:08:53,797 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1702566355] [2020-07-21 12:08:53,797 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 12:08:53,797 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 7] total 14 [2020-07-21 12:08:53,798 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [903964523] [2020-07-21 12:08:53,798 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 12:08:53,799 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 12:08:53,799 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 12:08:53,800 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=144, Unknown=1, NotChecked=0, Total=182 [2020-07-21 12:08:53,800 INFO L87 Difference]: Start difference. First operand 53 states and 67 transitions. Second operand 14 states. [2020-07-21 12:09:19,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 12:09:19,171 INFO L93 Difference]: Finished difference Result 97 states and 133 transitions. [2020-07-21 12:09:19,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 12:09:19,179 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 37 [2020-07-21 12:09:19,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 12:09:19,181 INFO L225 Difference]: With dead ends: 97 [2020-07-21 12:09:19,181 INFO L226 Difference]: Without dead ends: 67 [2020-07-21 12:09:19,182 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 55 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=41, Invalid=168, Unknown=1, NotChecked=0, Total=210 [2020-07-21 12:09:19,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-07-21 12:09:19,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2020-07-21 12:09:19,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-07-21 12:09:19,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 81 transitions. [2020-07-21 12:09:19,196 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 81 transitions. Word has length 37 [2020-07-21 12:09:19,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 12:09:19,197 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 81 transitions. [2020-07-21 12:09:19,197 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 12:09:19,197 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 81 transitions. [2020-07-21 12:09:19,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-07-21 12:09:19,199 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 12:09:19,199 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 12:09:19,399 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 12:09:19,400 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 12:09:19,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 12:09:19,401 INFO L82 PathProgramCache]: Analyzing trace with hash 964983039, now seen corresponding path program 1 times [2020-07-21 12:09:19,402 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 12:09:19,402 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1701014279] [2020-07-21 12:09:19,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 12:09:19,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 12:09:19,454 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 37 conjunts are in the unsatisfiable core [2020-07-21 12:09:19,461 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 12:09:19,817 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 6 proven. 34 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 12:09:19,817 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 12:09:19,866 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 12:09:23,320 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 17 proven. 0 refuted. 6 times theorem prover too weak. 29 trivial. 0 not checked. [2020-07-21 12:09:23,321 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1701014279] [2020-07-21 12:09:23,321 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 12:09:23,321 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 7] total 16 [2020-07-21 12:09:23,322 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [285288783] [2020-07-21 12:09:23,322 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 12:09:23,323 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 12:09:23,323 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 12:09:23,323 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=195, Unknown=1, NotChecked=0, Total=240 [2020-07-21 12:09:23,324 INFO L87 Difference]: Start difference. First operand 67 states and 81 transitions. Second operand 16 states. [2020-07-21 12:09:34,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 12:09:34,252 INFO L93 Difference]: Finished difference Result 110 states and 145 transitions. [2020-07-21 12:09:34,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 12:09:34,253 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 52 [2020-07-21 12:09:34,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 12:09:34,255 INFO L225 Difference]: With dead ends: 110 [2020-07-21 12:09:34,256 INFO L226 Difference]: Without dead ends: 80 [2020-07-21 12:09:34,257 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 81 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=48, Invalid=223, Unknown=1, NotChecked=0, Total=272 [2020-07-21 12:09:34,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-07-21 12:09:34,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 80. [2020-07-21 12:09:34,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-07-21 12:09:34,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 94 transitions. [2020-07-21 12:09:34,269 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 94 transitions. Word has length 52 [2020-07-21 12:09:34,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 12:09:34,270 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 94 transitions. [2020-07-21 12:09:34,270 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 12:09:34,270 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 94 transitions. [2020-07-21 12:09:34,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-07-21 12:09:34,272 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 12:09:34,272 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 12:09:34,488 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 12:09:34,488 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 12:09:34,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 12:09:34,489 INFO L82 PathProgramCache]: Analyzing trace with hash -52130443, now seen corresponding path program 1 times [2020-07-21 12:09:34,490 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 12:09:34,490 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1829959211] [2020-07-21 12:09:34,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 12:09:34,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 12:09:34,544 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 12:09:34,548 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 12:09:34,585 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 16 proven. 51 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2020-07-21 12:09:34,586 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 12:09:53,425 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 16 proven. 34 refuted. 17 times theorem prover too weak. 24 trivial. 0 not checked. [2020-07-21 12:09:53,426 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1829959211] [2020-07-21 12:09:53,426 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 12:09:53,426 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-21 12:09:53,426 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [772092571] [2020-07-21 12:09:53,428 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 12:09:53,428 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 12:09:53,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 12:09:53,428 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=80, Unknown=9, NotChecked=0, Total=132 [2020-07-21 12:09:53,429 INFO L87 Difference]: Start difference. First operand 80 states and 94 transitions. Second operand 12 states. [2020-07-21 12:09:55,687 WARN L838 $PredicateComparison]: unable to prove that (and (< 0 (mod (mod (mod (+ c_main_~l~0 4) 4294967296) 7) 4294967296)) (< 0 (mod (mod (mod (+ c_main_~l~0 3) 4294967296) 7) 4294967296)) (< 0 (mod (mod (mod (+ c_main_~l~0 1) 4294967296) 7) 4294967296)) (< 0 (mod (mod (mod c_main_~l~0 4294967296) 7) 4294967296))) is different from false [2020-07-21 12:09:57,750 WARN L838 $PredicateComparison]: unable to prove that (and (< 0 (mod (mod (mod (+ c_main_~l~0 3) 4294967296) 7) 4294967296)) (< 0 (mod (mod (mod (+ c_main_~l~0 1) 4294967296) 7) 4294967296)) (< 0 (mod (mod (mod c_main_~l~0 4294967296) 7) 4294967296))) is different from false [2020-07-21 12:09:59,822 WARN L838 $PredicateComparison]: unable to prove that (and (< 0 (mod (mod (mod (+ c_main_~l~0 3) 4294967296) 7) 4294967296)) (< 0 (mod (mod (mod (+ c_main_~l~0 1) 4294967296) 7) 4294967296))) is different from false [2020-07-21 12:10:59,330 WARN L838 $PredicateComparison]: unable to prove that (and (< 0 (mod (mod (mod (+ c_main_~l~0 2) 4294967296) 7) 4294967296)) (< 0 (mod (mod (mod c_main_~l~0 4294967296) 7) 4294967296))) is different from false [2020-07-21 12:12:53,760 WARN L838 $PredicateComparison]: unable to prove that (and (< 0 (mod (mod (mod (+ c_main_~l~0 1) 4294967296) 7) 4294967296)) (< 0 (mod (mod (mod c_main_~l~0 4294967296) 7) 4294967296))) is different from false [2020-07-21 12:13:23,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 12:13:23,249 INFO L93 Difference]: Finished difference Result 144 states and 197 transitions. [2020-07-21 12:13:23,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 12:13:23,362 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 64 [2020-07-21 12:13:23,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 12:13:23,365 INFO L225 Difference]: With dead ends: 144 [2020-07-21 12:13:23,365 INFO L226 Difference]: Without dead ends: 114 [2020-07-21 12:13:23,366 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 5 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 29.4s TimeCoverageRelationStatistics Valid=53, Invalid=85, Unknown=14, NotChecked=120, Total=272 [2020-07-21 12:13:23,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2020-07-21 12:13:23,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 113. [2020-07-21 12:13:23,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2020-07-21 12:13:23,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 145 transitions. [2020-07-21 12:13:23,381 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 145 transitions. Word has length 64 [2020-07-21 12:13:23,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 12:13:23,382 INFO L479 AbstractCegarLoop]: Abstraction has 113 states and 145 transitions. [2020-07-21 12:13:23,382 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 12:13:23,382 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 145 transitions. [2020-07-21 12:13:23,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-21 12:13:23,384 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 12:13:23,385 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 12:13:23,589 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 12:13:23,590 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 12:13:23,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 12:13:23,591 INFO L82 PathProgramCache]: Analyzing trace with hash 1890085349, now seen corresponding path program 1 times [2020-07-21 12:13:23,591 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 12:13:23,592 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2022917107] [2020-07-21 12:13:23,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 12:13:23,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 12:13:23,639 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 41 conjunts are in the unsatisfiable core [2020-07-21 12:13:23,642 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 12:13:24,028 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 8 proven. 68 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2020-07-21 12:13:24,029 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 12:13:24,068 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 12:14:47,603 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 9 proven. 0 refuted. 53 times theorem prover too weak. 38 trivial. 0 not checked. [2020-07-21 12:14:47,603 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2022917107] [2020-07-21 12:14:47,604 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 12:14:47,604 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 12] total 23 [2020-07-21 12:14:47,604 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1010858653] [2020-07-21 12:14:47,605 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 12:14:47,605 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 12:14:47,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 12:14:47,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=393, Unknown=23, NotChecked=0, Total=506 [2020-07-21 12:14:47,606 INFO L87 Difference]: Start difference. First operand 113 states and 145 transitions. Second operand 23 states. [2020-07-21 12:15:07,566 WARN L193 SmtUtils]: Spent 8.62 s on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-21 12:16:57,924 WARN L193 SmtUtils]: Spent 4.26 s on a formula simplification that was a NOOP. DAG size: 28 [2020-07-21 12:18:12,260 WARN L193 SmtUtils]: Spent 4.26 s on a formula simplification that was a NOOP. DAG size: 27 [2020-07-21 12:18:33,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 12:18:33,497 INFO L93 Difference]: Finished difference Result 165 states and 228 transitions. [2020-07-21 12:18:33,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-07-21 12:18:33,498 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 67 [2020-07-21 12:18:33,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 12:18:33,501 INFO L225 Difference]: With dead ends: 165 [2020-07-21 12:18:33,501 INFO L226 Difference]: Without dead ends: 121 [2020-07-21 12:18:33,502 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 109 SyntacticMatches, 7 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 160.9s TimeCoverageRelationStatistics Valid=137, Invalid=573, Unknown=46, NotChecked=0, Total=756 [2020-07-21 12:18:33,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2020-07-21 12:18:33,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 111. [2020-07-21 12:18:33,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2020-07-21 12:18:33,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 135 transitions. [2020-07-21 12:18:33,517 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 135 transitions. Word has length 67 [2020-07-21 12:18:33,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 12:18:33,518 INFO L479 AbstractCegarLoop]: Abstraction has 111 states and 135 transitions. [2020-07-21 12:18:33,518 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 12:18:33,518 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 135 transitions. [2020-07-21 12:18:33,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-07-21 12:18:33,520 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 12:18:33,520 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 6, 5, 5, 5, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 12:18:33,735 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 12:18:33,736 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 12:18:33,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 12:18:33,737 INFO L82 PathProgramCache]: Analyzing trace with hash -1908478694, now seen corresponding path program 1 times [2020-07-21 12:18:33,737 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 12:18:33,738 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [796017275] [2020-07-21 12:18:33,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 12:18:33,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 12:18:33,818 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 12:18:33,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 12:18:33,880 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 24 proven. 112 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2020-07-21 12:18:33,881 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 12:18:34,088 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 24 proven. 112 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2020-07-21 12:18:34,089 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [796017275] [2020-07-21 12:18:34,089 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 12:18:34,089 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 16 [2020-07-21 12:18:34,090 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1002411316] [2020-07-21 12:18:34,090 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 12:18:34,091 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 12:18:34,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 12:18:34,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=168, Unknown=0, NotChecked=0, Total=240 [2020-07-21 12:18:34,092 INFO L87 Difference]: Start difference. First operand 111 states and 135 transitions. Second operand 16 states. [2020-07-21 12:18:35,226 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 26 [2020-07-21 12:18:35,701 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 12:18:39,002 WARN L193 SmtUtils]: Spent 2.18 s on a formula simplification that was a NOOP. DAG size: 22 [2020-07-21 12:18:40,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 12:18:40,398 INFO L93 Difference]: Finished difference Result 348 states and 534 transitions. [2020-07-21 12:18:40,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-07-21 12:18:40,399 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 86 [2020-07-21 12:18:40,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 12:18:40,402 INFO L225 Difference]: With dead ends: 348 [2020-07-21 12:18:40,403 INFO L226 Difference]: Without dead ends: 306 [2020-07-21 12:18:40,405 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 207 GetRequests, 157 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 718 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=684, Invalid=1968, Unknown=0, NotChecked=0, Total=2652 [2020-07-21 12:18:40,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 306 states. [2020-07-21 12:18:40,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 306 to 305. [2020-07-21 12:18:40,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 305 states. [2020-07-21 12:18:40,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 305 states to 305 states and 435 transitions. [2020-07-21 12:18:40,434 INFO L78 Accepts]: Start accepts. Automaton has 305 states and 435 transitions. Word has length 86 [2020-07-21 12:18:40,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 12:18:40,435 INFO L479 AbstractCegarLoop]: Abstraction has 305 states and 435 transitions. [2020-07-21 12:18:40,435 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 12:18:40,435 INFO L276 IsEmpty]: Start isEmpty. Operand 305 states and 435 transitions. [2020-07-21 12:18:40,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-07-21 12:18:40,436 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 12:18:40,437 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 6, 6, 6, 5, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 12:18:40,649 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 12:18:40,650 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 12:18:40,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 12:18:40,651 INFO L82 PathProgramCache]: Analyzing trace with hash -422182347, now seen corresponding path program 1 times [2020-07-21 12:18:40,651 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 12:18:40,652 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [490524026] [2020-07-21 12:18:40,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 12:18:40,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 12:18:40,724 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 49 conjunts are in the unsatisfiable core [2020-07-21 12:18:40,727 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 12:18:41,368 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 12 proven. 134 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2020-07-21 12:18:41,368 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 12:18:41,423 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 12:21:08,905 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 13 proven. 0 refuted. 108 times theorem prover too weak. 85 trivial. 0 not checked. [2020-07-21 12:21:08,906 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [490524026] [2020-07-21 12:21:08,906 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 12:21:08,906 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 15] total 30 [2020-07-21 12:21:08,907 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [232007335] [2020-07-21 12:21:08,907 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-07-21 12:21:08,907 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 12:21:08,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-07-21 12:21:08,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=677, Unknown=47, NotChecked=0, Total=870 [2020-07-21 12:21:08,909 INFO L87 Difference]: Start difference. First operand 305 states and 435 transitions. Second operand 30 states. [2020-07-21 12:21:26,841 WARN L193 SmtUtils]: Spent 6.34 s on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 12:21:58,718 WARN L193 SmtUtils]: Spent 14.98 s on a formula simplification. DAG size of input: 42 DAG size of output: 26