/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/bitvector/gcd_4.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 10:45:31,715 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 10:45:31,717 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 10:45:31,730 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 10:45:31,730 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 10:45:31,731 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 10:45:31,732 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 10:45:31,734 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 10:45:31,736 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 10:45:31,737 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 10:45:31,738 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 10:45:31,739 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 10:45:31,739 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 10:45:31,740 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 10:45:31,741 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 10:45:31,742 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 10:45:31,743 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 10:45:31,744 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 10:45:31,746 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 10:45:31,748 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 10:45:31,749 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 10:45:31,750 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 10:45:31,751 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 10:45:31,752 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 10:45:31,755 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 10:45:31,762 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 10:45:31,763 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 10:45:31,764 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 10:45:31,764 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 10:45:31,779 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 10:45:31,779 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 10:45:31,780 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 10:45:31,781 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 10:45:31,781 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 10:45:31,781 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 10:45:31,781 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 10:45:31,781 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 10:45:31,782 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 10:45:31,782 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 10:45:31,782 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 10:45:31,782 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 10:45:31,782 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 10:45:31,783 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 10:45:31,783 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 10:45:31,783 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 10:45:31,783 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 10:45:31,783 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 10:45:31,784 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 10:45:31,784 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 10:45:31,784 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 10:45:31,784 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 10:45:31,784 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 10:45:31,785 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 10:45:31,785 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 10:45:31,785 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 10:45:31,785 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:45:31,785 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 10:45:31,785 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 10:45:31,786 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 [2020-07-20 10:45:32,056 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 10:45:32,076 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 10:45:32,081 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 10:45:32,082 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 10:45:32,083 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 10:45:32,084 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/bitvector/gcd_4.c [2020-07-20 10:45:32,158 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c404d385d/06af382ce31b455e9e68c7dc6d131c8f/FLAGa23faad55 [2020-07-20 10:45:32,627 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 10:45:32,628 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/bitvector/gcd_4.c [2020-07-20 10:45:32,634 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c404d385d/06af382ce31b455e9e68c7dc6d131c8f/FLAGa23faad55 [2020-07-20 10:45:33,023 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c404d385d/06af382ce31b455e9e68c7dc6d131c8f [2020-07-20 10:45:33,032 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 10:45:33,034 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 10:45:33,035 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 10:45:33,035 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 10:45:33,039 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 10:45:33,040 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 10:45:33" (1/1) ... [2020-07-20 10:45:33,043 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@280fe8ad and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:45:33, skipping insertion in model container [2020-07-20 10:45:33,043 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 10:45:33" (1/1) ... [2020-07-20 10:45:33,052 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 10:45:33,069 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 10:45:33,343 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 10:45:33,349 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 10:45:33,378 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 10:45:33,394 INFO L208 MainTranslator]: Completed translation [2020-07-20 10:45:33,395 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:45:33 WrapperNode [2020-07-20 10:45:33,395 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 10:45:33,395 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 10:45:33,396 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 10:45:33,396 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 10:45:33,410 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:45:33" (1/1) ... [2020-07-20 10:45:33,412 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:45:33" (1/1) ... [2020-07-20 10:45:33,546 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:45:33" (1/1) ... [2020-07-20 10:45:33,546 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:45:33" (1/1) ... [2020-07-20 10:45:33,553 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:45:33" (1/1) ... [2020-07-20 10:45:33,560 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:45:33" (1/1) ... [2020-07-20 10:45:33,566 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:45:33" (1/1) ... [2020-07-20 10:45:33,575 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 10:45:33,576 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 10:45:33,576 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 10:45:33,576 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 10:45:33,578 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:45:33" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 10:45:33,641 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 10:45:33,641 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 10:45:33,641 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 10:45:33,641 INFO L138 BoogieDeclarations]: Found implementation of procedure gcd_test [2020-07-20 10:45:33,641 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 10:45:33,641 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 10:45:33,642 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 10:45:33,642 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 10:45:33,642 INFO L130 BoogieDeclarations]: Found specification of procedure gcd_test [2020-07-20 10:45:33,642 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 10:45:33,642 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 10:45:33,642 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 10:45:33,828 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 10:45:33,828 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 10:45:33,836 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 10:45:33 BoogieIcfgContainer [2020-07-20 10:45:33,837 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 10:45:33,838 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 10:45:33,838 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 10:45:33,842 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 10:45:33,842 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 10:45:33" (1/3) ... [2020-07-20 10:45:33,843 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@455b076b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 10:45:33, skipping insertion in model container [2020-07-20 10:45:33,843 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:45:33" (2/3) ... [2020-07-20 10:45:33,843 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@455b076b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 10:45:33, skipping insertion in model container [2020-07-20 10:45:33,844 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 10:45:33" (3/3) ... [2020-07-20 10:45:33,845 INFO L109 eAbstractionObserver]: Analyzing ICFG gcd_4.c [2020-07-20 10:45:33,854 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 10:45:33,861 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 10:45:33,875 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 10:45:33,900 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 10:45:33,900 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 10:45:33,900 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 10:45:33,901 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 10:45:33,901 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 10:45:33,901 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 10:45:33,901 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 10:45:33,901 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 10:45:33,921 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states. [2020-07-20 10:45:33,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-20 10:45:33,928 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:45:33,929 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:45:33,929 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:45:33,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:45:33,935 INFO L82 PathProgramCache]: Analyzing trace with hash 876608673, now seen corresponding path program 1 times [2020-07-20 10:45:33,942 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:45:33,942 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1296137499] [2020-07-20 10:45:33,943 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 [2020-07-20 10:45:33,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:45:34,000 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 10:45:34,007 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:45:34,172 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 10:45:34,173 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 10:45:34,174 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1296137499] [2020-07-20 10:45:34,174 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 10:45:34,175 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 10:45:34,176 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [788105947] [2020-07-20 10:45:34,180 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 10:45:34,181 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:45:34,191 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 10:45:34,192 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 10:45:34,194 INFO L87 Difference]: Start difference. First operand 30 states. Second operand 5 states. [2020-07-20 10:45:34,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:45:34,292 INFO L93 Difference]: Finished difference Result 60 states and 81 transitions. [2020-07-20 10:45:34,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 10:45:34,294 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-07-20 10:45:34,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:45:34,305 INFO L225 Difference]: With dead ends: 60 [2020-07-20 10:45:34,306 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 10:45:34,309 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 10:45:34,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 10:45:34,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2020-07-20 10:45:34,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-07-20 10:45:34,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 30 transitions. [2020-07-20 10:45:34,354 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 30 transitions. Word has length 17 [2020-07-20 10:45:34,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:45:34,355 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 30 transitions. [2020-07-20 10:45:34,355 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 10:45:34,355 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 30 transitions. [2020-07-20 10:45:34,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-20 10:45:34,357 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:45:34,357 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:45:34,565 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:45:34,565 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:45:34,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:45:34,567 INFO L82 PathProgramCache]: Analyzing trace with hash 483581663, now seen corresponding path program 1 times [2020-07-20 10:45:34,567 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:45:34,568 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1387268287] [2020-07-20 10:45:34,569 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 [2020-07-20 10:45:34,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:45:34,604 INFO L263 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 10:45:34,608 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:45:34,651 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 10:45:34,651 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 10:45:34,652 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1387268287] [2020-07-20 10:45:34,652 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 10:45:34,652 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 10:45:34,653 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1404447796] [2020-07-20 10:45:34,655 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 10:45:34,655 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:45:34,655 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 10:45:34,655 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 10:45:34,656 INFO L87 Difference]: Start difference. First operand 25 states and 30 transitions. Second operand 5 states. [2020-07-20 10:45:34,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:45:34,706 INFO L93 Difference]: Finished difference Result 42 states and 50 transitions. [2020-07-20 10:45:34,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 10:45:34,707 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-07-20 10:45:34,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:45:34,708 INFO L225 Difference]: With dead ends: 42 [2020-07-20 10:45:34,708 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 10:45:34,710 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 [2020-07-20 10:45:34,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 10:45:34,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2020-07-20 10:45:34,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-07-20 10:45:34,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2020-07-20 10:45:34,717 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 17 [2020-07-20 10:45:34,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:45:34,718 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2020-07-20 10:45:34,718 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 10:45:34,718 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2020-07-20 10:45:34,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 10:45:34,719 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:45:34,719 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:45:34,932 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:45:34,933 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:45:34,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:45:34,934 INFO L82 PathProgramCache]: Analyzing trace with hash -1158269966, now seen corresponding path program 1 times [2020-07-20 10:45:34,934 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:45:34,935 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [647359308] [2020-07-20 10:45:34,935 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 [2020-07-20 10:45:34,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:45:34,980 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 10:45:34,981 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:45:35,014 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 10:45:35,014 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 10:45:35,015 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [647359308] [2020-07-20 10:45:35,015 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 10:45:35,015 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 10:45:35,015 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1700444491] [2020-07-20 10:45:35,016 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 10:45:35,016 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:45:35,016 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 10:45:35,016 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 10:45:35,016 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand 5 states. [2020-07-20 10:45:35,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:45:35,076 INFO L93 Difference]: Finished difference Result 46 states and 55 transitions. [2020-07-20 10:45:35,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 10:45:35,077 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 19 [2020-07-20 10:45:35,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:45:35,078 INFO L225 Difference]: With dead ends: 46 [2020-07-20 10:45:35,078 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 10:45:35,079 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 10:45:35,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 10:45:35,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2020-07-20 10:45:35,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-07-20 10:45:35,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2020-07-20 10:45:35,086 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 19 [2020-07-20 10:45:35,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:45:35,087 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2020-07-20 10:45:35,087 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 10:45:35,087 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2020-07-20 10:45:35,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 10:45:35,088 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:45:35,088 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:45:35,292 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:45:35,292 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:45:35,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:45:35,293 INFO L82 PathProgramCache]: Analyzing trace with hash -457205388, now seen corresponding path program 1 times [2020-07-20 10:45:35,294 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:45:35,295 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [468836292] [2020-07-20 10:45:35,295 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 [2020-07-20 10:45:35,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:45:35,322 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 10:45:35,323 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:45:35,352 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 10:45:35,352 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 10:45:35,353 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [468836292] [2020-07-20 10:45:35,353 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 10:45:35,353 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 10:45:35,354 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1973676944] [2020-07-20 10:45:35,354 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 10:45:35,354 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:45:35,355 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 10:45:35,355 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 10:45:35,355 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand 5 states. [2020-07-20 10:45:35,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:45:35,399 INFO L93 Difference]: Finished difference Result 40 states and 46 transitions. [2020-07-20 10:45:35,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 10:45:35,401 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 19 [2020-07-20 10:45:35,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:45:35,402 INFO L225 Difference]: With dead ends: 40 [2020-07-20 10:45:35,402 INFO L226 Difference]: Without dead ends: 27 [2020-07-20 10:45:35,403 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 10:45:35,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-07-20 10:45:35,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-07-20 10:45:35,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-20 10:45:35,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2020-07-20 10:45:35,410 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 19 [2020-07-20 10:45:35,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:45:35,410 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2020-07-20 10:45:35,411 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 10:45:35,411 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2020-07-20 10:45:35,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 10:45:35,412 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:45:35,412 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:45:35,622 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:45:35,623 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:45:35,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:45:35,624 INFO L82 PathProgramCache]: Analyzing trace with hash -1431348209, now seen corresponding path program 1 times [2020-07-20 10:45:35,625 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:45:35,626 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2056369543] [2020-07-20 10:45:35,626 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 [2020-07-20 10:45:35,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:45:35,654 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 10:45:35,656 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:45:35,718 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 10:45:35,719 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:45:35,843 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 10:45:35,844 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2056369543] [2020-07-20 10:45:35,844 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:45:35,844 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 9 [2020-07-20 10:45:35,845 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1507651945] [2020-07-20 10:45:35,845 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 10:45:35,845 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:45:35,845 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 10:45:35,846 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2020-07-20 10:45:35,846 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand 9 states. [2020-07-20 10:45:35,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:45:35,925 INFO L93 Difference]: Finished difference Result 46 states and 56 transitions. [2020-07-20 10:45:35,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 10:45:35,926 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 21 [2020-07-20 10:45:35,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:45:35,927 INFO L225 Difference]: With dead ends: 46 [2020-07-20 10:45:35,927 INFO L226 Difference]: Without dead ends: 29 [2020-07-20 10:45:35,928 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 32 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2020-07-20 10:45:35,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-07-20 10:45:35,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-07-20 10:45:35,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-07-20 10:45:35,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-07-20 10:45:35,934 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 21 [2020-07-20 10:45:35,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:45:35,935 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-07-20 10:45:35,935 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 10:45:35,935 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-07-20 10:45:35,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-20 10:45:35,936 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:45:35,936 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:45:36,149 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:45:36,150 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:45:36,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:45:36,151 INFO L82 PathProgramCache]: Analyzing trace with hash -1537894100, now seen corresponding path program 1 times [2020-07-20 10:45:36,151 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:45:36,152 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1202242911] [2020-07-20 10:45:36,152 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 [2020-07-20 10:45:36,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:45:36,176 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-20 10:45:36,178 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:45:36,345 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 10:45:36,346 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:45:36,455 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1202242911] [2020-07-20 10:45:36,455 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 10:45:36,456 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-07-20 10:45:36,456 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1529772900] [2020-07-20 10:45:36,458 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-20 10:45:36,458 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:45:36,458 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-20 10:45:36,459 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-07-20 10:45:36,459 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 7 states. [2020-07-20 10:45:36,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:45:36,649 INFO L93 Difference]: Finished difference Result 48 states and 58 transitions. [2020-07-20 10:45:36,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 10:45:36,650 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2020-07-20 10:45:36,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:45:36,651 INFO L225 Difference]: With dead ends: 48 [2020-07-20 10:45:36,651 INFO L226 Difference]: Without dead ends: 31 [2020-07-20 10:45:36,657 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 10:45:36,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-07-20 10:45:36,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-07-20 10:45:36,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 10:45:36,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-07-20 10:45:36,670 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 23 [2020-07-20 10:45:36,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:45:36,670 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-07-20 10:45:36,671 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-20 10:45:36,671 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-07-20 10:45:36,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 10:45:36,675 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:45:36,675 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:45:36,888 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:45:36,889 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:45:36,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:45:36,889 INFO L82 PathProgramCache]: Analyzing trace with hash -849280247, now seen corresponding path program 2 times [2020-07-20 10:45:36,890 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:45:36,890 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1793921399] [2020-07-20 10:45:36,890 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 [2020-07-20 10:45:36,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:45:36,922 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 10:45:36,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:45:37,076 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 10:45:37,076 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:45:37,175 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1793921399] [2020-07-20 10:45:37,175 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 10:45:37,175 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-07-20 10:45:37,176 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [900651580] [2020-07-20 10:45:37,176 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 10:45:37,177 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:45:37,177 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 10:45:37,177 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2020-07-20 10:45:37,177 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 8 states. [2020-07-20 10:45:37,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:45:37,391 INFO L93 Difference]: Finished difference Result 50 states and 60 transitions. [2020-07-20 10:45:37,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 10:45:37,393 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 25 [2020-07-20 10:45:37,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:45:37,394 INFO L225 Difference]: With dead ends: 50 [2020-07-20 10:45:37,394 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 10:45:37,395 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 10:45:37,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 10:45:37,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-07-20 10:45:37,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-20 10:45:37,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2020-07-20 10:45:37,401 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 25 [2020-07-20 10:45:37,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:45:37,401 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2020-07-20 10:45:37,401 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 10:45:37,401 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2020-07-20 10:45:37,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 10:45:37,402 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:45:37,402 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:45:37,610 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:45:37,611 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:45:37,612 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:45:37,612 INFO L82 PathProgramCache]: Analyzing trace with hash -516331098, now seen corresponding path program 3 times [2020-07-20 10:45:37,613 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:45:37,613 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1839933280] [2020-07-20 10:45:37,614 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 [2020-07-20 10:45:37,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:45:37,645 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 10:45:37,647 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:45:37,788 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 10:45:37,789 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:45:37,883 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1839933280] [2020-07-20 10:45:37,883 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 10:45:37,883 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-07-20 10:45:37,883 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1326711664] [2020-07-20 10:45:37,884 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 10:45:37,884 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:45:37,884 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 10:45:37,884 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-07-20 10:45:37,884 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 9 states. [2020-07-20 10:45:38,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:45:38,071 INFO L93 Difference]: Finished difference Result 52 states and 62 transitions. [2020-07-20 10:45:38,075 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 10:45:38,075 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-20 10:45:38,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:45:38,076 INFO L225 Difference]: With dead ends: 52 [2020-07-20 10:45:38,076 INFO L226 Difference]: Without dead ends: 35 [2020-07-20 10:45:38,079 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2020-07-20 10:45:38,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-07-20 10:45:38,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-07-20 10:45:38,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 10:45:38,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-07-20 10:45:38,092 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 27 [2020-07-20 10:45:38,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:45:38,093 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-07-20 10:45:38,093 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 10:45:38,093 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-07-20 10:45:38,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-20 10:45:38,096 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:45:38,096 INFO L422 BasicCegarLoop]: trace histogram [5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:45:38,312 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:45:38,313 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:45:38,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:45:38,313 INFO L82 PathProgramCache]: Analyzing trace with hash 1878386625, now seen corresponding path program 4 times [2020-07-20 10:45:38,314 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:45:38,314 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [10225495] [2020-07-20 10:45:38,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:45:38,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:45:38,351 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-20 10:45:38,353 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:45:38,502 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 10:45:38,503 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:45:38,533 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:45:38,534 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:45:38,535 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:45:38,538 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:45:38,539 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:45:38,540 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:45:38,540 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:45:42,396 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 10:45:42,396 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [10225495] [2020-07-20 10:45:42,397 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:45:42,397 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 20 [2020-07-20 10:45:42,397 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1430607924] [2020-07-20 10:45:42,397 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 10:45:42,398 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:45:42,398 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 10:45:42,398 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=335, Unknown=1, NotChecked=0, Total=380 [2020-07-20 10:45:42,399 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 20 states. [2020-07-20 10:45:43,641 WARN L193 SmtUtils]: Spent 300.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 8 [2020-07-20 10:45:50,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:45:50,761 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2020-07-20 10:45:50,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 10:45:50,765 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 29 [2020-07-20 10:45:50,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:45:50,767 INFO L225 Difference]: With dead ends: 52 [2020-07-20 10:45:50,767 INFO L226 Difference]: Without dead ends: 39 [2020-07-20 10:45:50,768 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 37 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=82, Invalid=619, Unknown=1, NotChecked=0, Total=702 [2020-07-20 10:45:50,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-07-20 10:45:50,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-07-20 10:45:50,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-07-20 10:45:50,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 45 transitions. [2020-07-20 10:45:50,775 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 45 transitions. Word has length 29 [2020-07-20 10:45:50,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:45:50,775 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 45 transitions. [2020-07-20 10:45:50,775 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 10:45:50,775 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 45 transitions. [2020-07-20 10:45:50,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-20 10:45:50,776 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:45:50,776 INFO L422 BasicCegarLoop]: trace histogram [6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:45:50,990 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:45:50,991 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:45:50,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:45:50,991 INFO L82 PathProgramCache]: Analyzing trace with hash 841482334, now seen corresponding path program 5 times [2020-07-20 10:45:50,991 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:45:50,992 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [152254504] [2020-07-20 10:45:50,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:45:51,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:45:51,020 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 10:45:51,021 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:45:51,218 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 10:45:51,218 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:45:51,367 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [152254504] [2020-07-20 10:45:51,367 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 10:45:51,367 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-07-20 10:45:51,367 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [719604564] [2020-07-20 10:45:51,368 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 10:45:51,368 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:45:51,368 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 10:45:51,369 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-07-20 10:45:51,369 INFO L87 Difference]: Start difference. First operand 39 states and 45 transitions. Second operand 9 states. [2020-07-20 10:46:03,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:46:03,736 INFO L93 Difference]: Finished difference Result 54 states and 63 transitions. [2020-07-20 10:46:03,741 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 10:46:03,741 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 31 [2020-07-20 10:46:03,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:46:03,742 INFO L225 Difference]: With dead ends: 54 [2020-07-20 10:46:03,742 INFO L226 Difference]: Without dead ends: 37 [2020-07-20 10:46:03,743 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=22, Invalid=87, Unknown=1, NotChecked=0, Total=110 [2020-07-20 10:46:03,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-20 10:46:03,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-07-20 10:46:03,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-07-20 10:46:03,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2020-07-20 10:46:03,752 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 31 [2020-07-20 10:46:03,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:46:03,752 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2020-07-20 10:46:03,752 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 10:46:03,752 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2020-07-20 10:46:03,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-20 10:46:03,753 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:46:03,753 INFO L422 BasicCegarLoop]: trace histogram [6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:46:03,954 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:46:03,955 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:46:03,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:46:03,955 INFO L82 PathProgramCache]: Analyzing trace with hash 1492674782, now seen corresponding path program 6 times [2020-07-20 10:46:03,956 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:46:03,956 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2094705923] [2020-07-20 10:46:03,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:46:03,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:46:03,980 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 10:46:03,982 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:46:03,990 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2020-07-20 10:46:03,990 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 10:46:03,991 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2094705923] [2020-07-20 10:46:03,991 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 10:46:03,991 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 10:46:03,992 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1217145687] [2020-07-20 10:46:03,992 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 10:46:03,993 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:46:03,993 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 10:46:03,993 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 10:46:03,993 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 3 states. [2020-07-20 10:46:04,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:46:04,022 INFO L93 Difference]: Finished difference Result 51 states and 57 transitions. [2020-07-20 10:46:04,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 10:46:04,025 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 31 [2020-07-20 10:46:04,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:46:04,026 INFO L225 Difference]: With dead ends: 51 [2020-07-20 10:46:04,026 INFO L226 Difference]: Without dead ends: 38 [2020-07-20 10:46:04,027 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 10:46:04,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-20 10:46:04,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-07-20 10:46:04,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-07-20 10:46:04,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 42 transitions. [2020-07-20 10:46:04,032 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 42 transitions. Word has length 31 [2020-07-20 10:46:04,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:46:04,032 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 42 transitions. [2020-07-20 10:46:04,032 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 10:46:04,033 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 42 transitions. [2020-07-20 10:46:04,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-07-20 10:46:04,034 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:46:04,034 INFO L422 BasicCegarLoop]: trace histogram [7, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:46:04,240 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:46:04,241 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:46:04,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:46:04,242 INFO L82 PathProgramCache]: Analyzing trace with hash -202245895, now seen corresponding path program 7 times [2020-07-20 10:46:04,242 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:46:04,242 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [536737625] [2020-07-20 10:46:04,243 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:46:04,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:46:04,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 10:46:04,271 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:46:04,799 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 10:46:04,799 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:46:05,150 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [536737625] [2020-07-20 10:46:05,150 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 10:46:05,151 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-07-20 10:46:05,151 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2110730139] [2020-07-20 10:46:05,151 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 10:46:05,151 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:46:05,152 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 10:46:05,152 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2020-07-20 10:46:05,152 INFO L87 Difference]: Start difference. First operand 38 states and 42 transitions. Second operand 12 states. [2020-07-20 10:46:08,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:46:08,206 INFO L93 Difference]: Finished difference Result 63 states and 75 transitions. [2020-07-20 10:46:08,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 10:46:08,210 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 33 [2020-07-20 10:46:08,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:46:08,211 INFO L225 Difference]: With dead ends: 63 [2020-07-20 10:46:08,211 INFO L226 Difference]: Without dead ends: 40 [2020-07-20 10:46:08,212 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=50, Invalid=256, Unknown=0, NotChecked=0, Total=306 [2020-07-20 10:46:08,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-07-20 10:46:08,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-07-20 10:46:08,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-20 10:46:08,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2020-07-20 10:46:08,218 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 33 [2020-07-20 10:46:08,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:46:08,218 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2020-07-20 10:46:08,219 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 10:46:08,219 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2020-07-20 10:46:08,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-07-20 10:46:08,220 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:46:08,220 INFO L422 BasicCegarLoop]: trace histogram [8, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:46:08,420 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:46:08,421 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:46:08,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:46:08,421 INFO L82 PathProgramCache]: Analyzing trace with hash -1486576746, now seen corresponding path program 8 times [2020-07-20 10:46:08,421 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:46:08,421 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1990865108] [2020-07-20 10:46:08,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:46:08,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:46:08,448 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 10:46:08,450 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:46:13,098 WARN L860 $PredicateComparison]: unable to prove that (exists ((v_gcd_test_~a_103 Int)) (and (<= (div (+ v_gcd_test_~a_103 (* |c_gcd_test_#in~a| (- 1))) (- 3)) |c_gcd_test_#in~b|) (<= (+ (* 2 v_gcd_test_~a_103) (div (+ (* v_gcd_test_~a_103 (- 1)) (* c_gcd_test_~b (- 1))) (- 3))) |c_gcd_test_#in~b|))) is different from true [2020-07-20 10:46:13,250 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 8 not checked. [2020-07-20 10:46:13,250 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:46:13,677 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1990865108] [2020-07-20 10:46:13,677 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 10:46:13,677 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-07-20 10:46:13,677 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1224666641] [2020-07-20 10:46:13,678 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 10:46:13,678 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:46:13,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 10:46:13,679 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=132, Unknown=2, NotChecked=22, Total=182 [2020-07-20 10:46:13,679 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand 13 states. [2020-07-20 10:46:37,014 WARN L193 SmtUtils]: Spent 2.06 s on a formula simplification that was a NOOP. DAG size: 25 [2020-07-20 10:46:37,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:46:37,281 INFO L93 Difference]: Finished difference Result 59 states and 67 transitions. [2020-07-20 10:46:37,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 10:46:37,286 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 35 [2020-07-20 10:46:37,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:46:37,287 INFO L225 Difference]: With dead ends: 59 [2020-07-20 10:46:37,287 INFO L226 Difference]: Without dead ends: 42 [2020-07-20 10:46:37,288 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 14.0s TimeCoverageRelationStatistics Valid=57, Invalid=284, Unknown=5, NotChecked=34, Total=380 [2020-07-20 10:46:37,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-20 10:46:37,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-07-20 10:46:37,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-07-20 10:46:37,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 45 transitions. [2020-07-20 10:46:37,293 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 45 transitions. Word has length 35 [2020-07-20 10:46:37,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:46:37,294 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 45 transitions. [2020-07-20 10:46:37,294 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 10:46:37,294 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 45 transitions. [2020-07-20 10:46:37,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-07-20 10:46:37,295 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:46:37,295 INFO L422 BasicCegarLoop]: trace histogram [9, 6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:46:37,508 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:46:37,509 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:46:37,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:46:37,510 INFO L82 PathProgramCache]: Analyzing trace with hash 1222056691, now seen corresponding path program 9 times [2020-07-20 10:46:37,510 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:46:37,510 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2071054819] [2020-07-20 10:46:37,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:46:37,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:46:37,536 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 10:46:37,537 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:46:41,705 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 10:46:41,706 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:46:42,338 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2071054819] [2020-07-20 10:46:42,338 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 10:46:42,338 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-07-20 10:46:42,338 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1683413040] [2020-07-20 10:46:42,338 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 10:46:42,339 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:46:42,339 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 10:46:42,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=181, Unknown=1, NotChecked=0, Total=210 [2020-07-20 10:46:42,339 INFO L87 Difference]: Start difference. First operand 42 states and 45 transitions. Second operand 14 states. [2020-07-20 10:46:56,376 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 28 [2020-07-20 10:46:58,548 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 26 [2020-07-20 10:47:08,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:47:08,276 INFO L93 Difference]: Finished difference Result 63 states and 72 transitions. [2020-07-20 10:47:08,287 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 10:47:08,287 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 37 [2020-07-20 10:47:08,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:47:08,288 INFO L225 Difference]: With dead ends: 63 [2020-07-20 10:47:08,288 INFO L226 Difference]: Without dead ends: 44 [2020-07-20 10:47:08,289 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=68, Invalid=392, Unknown=2, NotChecked=0, Total=462 [2020-07-20 10:47:08,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-07-20 10:47:08,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-07-20 10:47:08,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-07-20 10:47:08,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 47 transitions. [2020-07-20 10:47:08,295 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 47 transitions. Word has length 37 [2020-07-20 10:47:08,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:47:08,295 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 47 transitions. [2020-07-20 10:47:08,296 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 10:47:08,296 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 47 transitions. [2020-07-20 10:47:08,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 10:47:08,296 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:47:08,297 INFO L422 BasicCegarLoop]: trace histogram [10, 7, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:47:08,500 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:47:08,501 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:47:08,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:47:08,501 INFO L82 PathProgramCache]: Analyzing trace with hash 1468608272, now seen corresponding path program 10 times [2020-07-20 10:47:08,502 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:47:08,502 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [302327122] [2020-07-20 10:47:08,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:47:08,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:47:08,543 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-20 10:47:08,545 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:47:15,889 WARN L860 $PredicateComparison]: unable to prove that (exists ((v_gcd_test_~a_153 Int)) (and (<= (div (+ v_gcd_test_~a_153 (* |c_gcd_test_#in~a| (- 1))) (- 3)) |c_gcd_test_#in~b|) (<= (+ (div (+ (* v_gcd_test_~a_153 (- 1)) (* c_gcd_test_~b (- 1))) (- 5)) (* 2 v_gcd_test_~a_153)) |c_gcd_test_#in~b|))) is different from true [2020-07-20 10:47:16,210 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 10 not checked. [2020-07-20 10:47:16,211 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:47:17,116 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [302327122] [2020-07-20 10:47:17,117 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 10:47:17,117 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-07-20 10:47:17,117 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [378240768] [2020-07-20 10:47:17,118 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 10:47:17,118 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:47:17,118 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 10:47:17,120 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=181, Unknown=3, NotChecked=26, Total=240 [2020-07-20 10:47:17,120 INFO L87 Difference]: Start difference. First operand 44 states and 47 transitions. Second operand 15 states. [2020-07-20 10:47:31,489 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 28 [2020-07-20 10:47:32,874 WARN L193 SmtUtils]: Spent 202.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 26 [2020-07-20 10:47:33,280 WARN L193 SmtUtils]: Spent 227.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 27 [2020-07-20 10:47:48,390 WARN L193 SmtUtils]: Spent 2.08 s on a formula simplification that was a NOOP. DAG size: 26 [2020-07-20 10:47:49,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:47:49,249 INFO L93 Difference]: Finished difference Result 63 states and 71 transitions. [2020-07-20 10:47:49,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 10:47:49,256 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 39 [2020-07-20 10:47:49,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:47:49,257 INFO L225 Difference]: With dead ends: 63 [2020-07-20 10:47:49,257 INFO L226 Difference]: Without dead ends: 46 [2020-07-20 10:47:49,257 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 21.7s TimeCoverageRelationStatistics Valid=79, Invalid=423, Unknown=8, NotChecked=42, Total=552 [2020-07-20 10:47:49,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-07-20 10:47:49,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-07-20 10:47:49,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 10:47:49,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 49 transitions. [2020-07-20 10:47:49,272 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 49 transitions. Word has length 39 [2020-07-20 10:47:49,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:47:49,272 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 49 transitions. [2020-07-20 10:47:49,273 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 10:47:49,273 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 49 transitions. [2020-07-20 10:47:49,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-20 10:47:49,277 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:47:49,277 INFO L422 BasicCegarLoop]: trace histogram [11, 8, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:47:49,491 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:47:49,492 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:47:49,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:47:49,492 INFO L82 PathProgramCache]: Analyzing trace with hash -2113490963, now seen corresponding path program 11 times [2020-07-20 10:47:49,493 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:47:49,493 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [199464020] [2020-07-20 10:47:49,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:47:49,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:47:49,529 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 10:47:49,531 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:47:54,787 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 10:47:54,788 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:47:55,067 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 10:47:55,178 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 10:47:55,507 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 10:47:55,655 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 10:47:55,785 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 10:47:55,905 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 10:47:56,253 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [199464020] [2020-07-20 10:47:56,253 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 10:47:56,254 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-07-20 10:47:56,254 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1427755168] [2020-07-20 10:47:56,254 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 10:47:56,255 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:47:56,255 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 10:47:56,256 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=239, Unknown=1, NotChecked=0, Total=272 [2020-07-20 10:47:56,256 INFO L87 Difference]: Start difference. First operand 46 states and 49 transitions. Second operand 16 states. [2020-07-20 10:48:16,541 WARN L193 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 49 DAG size of output: 28 [2020-07-20 10:48:19,268 WARN L193 SmtUtils]: Spent 249.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 26 [2020-07-20 10:48:21,881 WARN L193 SmtUtils]: Spent 2.33 s on a formula simplification. DAG size of input: 39 DAG size of output: 27 [2020-07-20 10:48:24,544 WARN L193 SmtUtils]: Spent 316.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 28 [2020-07-20 10:48:35,907 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2020-07-20 10:48:37,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:48:37,745 INFO L93 Difference]: Finished difference Result 67 states and 76 transitions. [2020-07-20 10:48:37,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-20 10:48:37,758 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 41 [2020-07-20 10:48:37,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:48:37,759 INFO L225 Difference]: With dead ends: 67 [2020-07-20 10:48:37,759 INFO L226 Difference]: Without dead ends: 48 [2020-07-20 10:48:37,760 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 15.6s TimeCoverageRelationStatistics Valid=94, Invalid=553, Unknown=3, NotChecked=0, Total=650 [2020-07-20 10:48:37,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-20 10:48:37,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-07-20 10:48:37,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-07-20 10:48:37,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 51 transitions. [2020-07-20 10:48:37,765 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 51 transitions. Word has length 41 [2020-07-20 10:48:37,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:48:37,765 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 51 transitions. [2020-07-20 10:48:37,765 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 10:48:37,765 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 51 transitions. [2020-07-20 10:48:37,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-07-20 10:48:37,766 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:48:37,766 INFO L422 BasicCegarLoop]: trace histogram [12, 9, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:48:37,969 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:48:37,969 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:48:37,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:48:37,970 INFO L82 PathProgramCache]: Analyzing trace with hash 52915594, now seen corresponding path program 12 times [2020-07-20 10:48:37,970 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:48:37,971 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1254740139] [2020-07-20 10:48:37,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:48:38,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:48:38,004 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 10:48:38,014 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:48:50,744 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 10:48:50,745 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:48:50,856 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 10:48:50,967 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 10:48:51,097 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 10:48:51,226 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 10:48:51,349 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-20 10:48:51,561 WARN L193 SmtUtils]: Spent 209.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-20 10:48:51,757 WARN L193 SmtUtils]: Spent 193.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 10:48:51,944 WARN L193 SmtUtils]: Spent 184.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 10:48:52,134 WARN L193 SmtUtils]: Spent 187.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-20 10:48:52,308 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-20 10:48:52,470 WARN L193 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 10:48:52,958 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1254740139] [2020-07-20 10:48:52,958 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 10:48:52,959 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-07-20 10:48:52,959 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1153303774] [2020-07-20 10:48:52,959 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 10:48:52,961 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:48:52,962 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 10:48:52,962 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=268, Unknown=4, NotChecked=0, Total=306 [2020-07-20 10:48:52,962 INFO L87 Difference]: Start difference. First operand 48 states and 51 transitions. Second operand 17 states. [2020-07-20 10:49:24,728 WARN L193 SmtUtils]: Spent 251.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 28 [2020-07-20 10:49:33,577 WARN L193 SmtUtils]: Spent 324.00 ms on a formula simplification. DAG size of input: 49 DAG size of output: 26 [2020-07-20 10:49:34,851 WARN L193 SmtUtils]: Spent 340.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 27 [2020-07-20 10:49:37,661 WARN L193 SmtUtils]: Spent 258.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 28 [2020-07-20 10:49:42,470 WARN L193 SmtUtils]: Spent 277.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 28 [2020-07-20 10:49:45,029 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2020-07-20 10:49:48,326 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2020-07-20 10:49:51,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:49:51,084 INFO L93 Difference]: Finished difference Result 69 states and 78 transitions. [2020-07-20 10:49:51,105 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-20 10:49:51,105 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 43 [2020-07-20 10:49:51,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:49:51,106 INFO L225 Difference]: With dead ends: 69 [2020-07-20 10:49:51,106 INFO L226 Difference]: Without dead ends: 50 [2020-07-20 10:49:51,107 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 24.8s TimeCoverageRelationStatistics Valid=110, Invalid=639, Unknown=7, NotChecked=0, Total=756 [2020-07-20 10:49:51,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-07-20 10:49:51,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-07-20 10:49:51,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-20 10:49:51,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 53 transitions. [2020-07-20 10:49:51,113 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 53 transitions. Word has length 43 [2020-07-20 10:49:51,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:49:51,114 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 53 transitions. [2020-07-20 10:49:51,114 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 10:49:51,114 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 53 transitions. [2020-07-20 10:49:51,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-07-20 10:49:51,115 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:49:51,115 INFO L422 BasicCegarLoop]: trace histogram [13, 10, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:49:51,316 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:49:51,316 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:49:51,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:49:51,317 INFO L82 PathProgramCache]: Analyzing trace with hash -1089521689, now seen corresponding path program 13 times [2020-07-20 10:49:51,317 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:49:51,318 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [499958521] [2020-07-20 10:49:51,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:49:51,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:49:51,356 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 10:49:51,357 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:49:59,113 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 10:49:59,113 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:49:59,259 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-20 10:49:59,403 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-20 10:49:59,572 WARN L193 SmtUtils]: Spent 164.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-20 10:49:59,736 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-20 10:49:59,906 WARN L193 SmtUtils]: Spent 163.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-20 10:50:00,216 WARN L193 SmtUtils]: Spent 306.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-20 10:50:00,491 WARN L193 SmtUtils]: Spent 272.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-20 10:50:00,759 WARN L193 SmtUtils]: Spent 265.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-20 10:50:01,016 WARN L193 SmtUtils]: Spent 254.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 10:50:01,244 WARN L193 SmtUtils]: Spent 225.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 10:50:01,431 WARN L193 SmtUtils]: Spent 183.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 10:50:01,607 WARN L193 SmtUtils]: Spent 173.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-20 10:50:02,193 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [499958521] [2020-07-20 10:50:02,193 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 10:50:02,193 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-07-20 10:50:02,194 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [651091181] [2020-07-20 10:50:02,194 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 10:50:02,194 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:50:02,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 10:50:02,195 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=305, Unknown=1, NotChecked=0, Total=342 [2020-07-20 10:50:02,195 INFO L87 Difference]: Start difference. First operand 50 states and 53 transitions. Second operand 18 states. [2020-07-20 10:50:29,958 WARN L193 SmtUtils]: Spent 376.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 28 [2020-07-20 10:50:38,799 WARN L193 SmtUtils]: Spent 474.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 26 [2020-07-20 10:50:39,922 WARN L193 SmtUtils]: Spent 417.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 27 [2020-07-20 10:50:44,916 WARN L193 SmtUtils]: Spent 393.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 28 [2020-07-20 10:50:50,466 WARN L193 SmtUtils]: Spent 2.36 s on a formula simplification. DAG size of input: 40 DAG size of output: 28 [2020-07-20 10:50:54,375 WARN L193 SmtUtils]: Spent 355.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 28 [2020-07-20 10:50:58,925 WARN L193 SmtUtils]: Spent 158.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2020-07-20 10:51:10,964 WARN L193 SmtUtils]: Spent 193.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2020-07-20 10:51:15,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:51:15,059 INFO L93 Difference]: Finished difference Result 71 states and 80 transitions. [2020-07-20 10:51:15,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-20 10:51:15,085 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 45 [2020-07-20 10:51:15,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:51:15,085 INFO L225 Difference]: With dead ends: 71 [2020-07-20 10:51:15,085 INFO L226 Difference]: Without dead ends: 52 [2020-07-20 10:51:15,086 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 29.1s TimeCoverageRelationStatistics Valid=128, Invalid=736, Unknown=6, NotChecked=0, Total=870 [2020-07-20 10:51:15,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-07-20 10:51:15,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-07-20 10:51:15,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-07-20 10:51:15,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 55 transitions. [2020-07-20 10:51:15,095 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 55 transitions. Word has length 45 [2020-07-20 10:51:15,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:51:15,095 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 55 transitions. [2020-07-20 10:51:15,096 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 10:51:15,096 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 55 transitions. [2020-07-20 10:51:15,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-07-20 10:51:15,096 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:51:15,097 INFO L422 BasicCegarLoop]: trace histogram [14, 11, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:51:15,308 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:51:15,309 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:51:15,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:51:15,310 INFO L82 PathProgramCache]: Analyzing trace with hash 539877124, now seen corresponding path program 14 times [2020-07-20 10:51:15,310 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:51:15,311 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1805564433] [2020-07-20 10:51:15,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:51:15,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:51:15,351 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-20 10:51:15,352 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:51:34,951 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 10:51:34,951 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:51:35,182 WARN L193 SmtUtils]: Spent 229.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 10:51:35,400 WARN L193 SmtUtils]: Spent 213.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 10:51:35,602 WARN L193 SmtUtils]: Spent 197.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-20 10:51:35,800 WARN L193 SmtUtils]: Spent 194.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-20 10:51:35,993 WARN L193 SmtUtils]: Spent 186.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-20 10:51:36,282 WARN L193 SmtUtils]: Spent 285.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 10:51:36,687 WARN L193 SmtUtils]: Spent 401.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2020-07-20 10:51:37,054 WARN L193 SmtUtils]: Spent 363.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 10:51:37,412 WARN L193 SmtUtils]: Spent 354.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 10:51:37,736 WARN L193 SmtUtils]: Spent 320.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 10:51:38,048 WARN L193 SmtUtils]: Spent 308.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-20 10:51:38,341 WARN L193 SmtUtils]: Spent 288.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 10:51:38,619 WARN L193 SmtUtils]: Spent 274.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-20 10:51:40,717 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1805564433] [2020-07-20 10:51:40,718 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 10:51:40,718 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-07-20 10:51:40,718 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [60873076] [2020-07-20 10:51:40,719 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 10:51:40,719 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:51:40,719 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 10:51:40,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=338, Unknown=4, NotChecked=0, Total=380 [2020-07-20 10:51:40,719 INFO L87 Difference]: Start difference. First operand 52 states and 55 transitions. Second operand 19 states. [2020-07-20 10:51:54,173 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 11 [2020-07-20 10:52:20,520 WARN L193 SmtUtils]: Spent 422.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 28 [2020-07-20 10:52:27,040 WARN L193 SmtUtils]: Spent 537.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 26 [2020-07-20 10:52:31,230 WARN L193 SmtUtils]: Spent 649.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 27 [2020-07-20 10:52:34,667 WARN L193 SmtUtils]: Spent 536.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 28 [2020-07-20 10:52:36,986 WARN L193 SmtUtils]: Spent 520.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 28 [2020-07-20 10:52:40,580 WARN L193 SmtUtils]: Spent 471.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 28 [2020-07-20 10:52:46,183 WARN L193 SmtUtils]: Spent 473.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 28 [2020-07-20 10:52:53,640 WARN L193 SmtUtils]: Spent 267.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2020-07-20 10:53:04,445 WARN L193 SmtUtils]: Spent 231.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2020-07-20 10:53:08,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:53:08,298 INFO L93 Difference]: Finished difference Result 73 states and 82 transitions. [2020-07-20 10:53:08,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-20 10:53:08,328 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 47 [2020-07-20 10:53:08,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:53:08,329 INFO L225 Difference]: With dead ends: 73 [2020-07-20 10:53:08,329 INFO L226 Difference]: Without dead ends: 54 [2020-07-20 10:53:08,329 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 41.4s TimeCoverageRelationStatistics Valid=148, Invalid=838, Unknown=6, NotChecked=0, Total=992 [2020-07-20 10:53:08,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-07-20 10:53:08,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-07-20 10:53:08,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-07-20 10:53:08,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 57 transitions. [2020-07-20 10:53:08,337 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 57 transitions. Word has length 47 [2020-07-20 10:53:08,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:53:08,337 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 57 transitions. [2020-07-20 10:53:08,337 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 10:53:08,337 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 57 transitions. [2020-07-20 10:53:08,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-07-20 10:53:08,338 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:53:08,338 INFO L422 BasicCegarLoop]: trace histogram [15, 12, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:53:08,546 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:53:08,547 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:53:08,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:53:08,548 INFO L82 PathProgramCache]: Analyzing trace with hash -1270926623, now seen corresponding path program 15 times [2020-07-20 10:53:08,548 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:53:08,548 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [707425448] [2020-07-20 10:53:08,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:53:08,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:53:08,591 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 10:53:08,592 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:53:09,611 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 10:53:35,629 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 10:53:35,630 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:53:35,873 WARN L193 SmtUtils]: Spent 241.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 10:53:36,110 WARN L193 SmtUtils]: Spent 233.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 10:53:36,378 WARN L193 SmtUtils]: Spent 262.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 10:53:36,658 WARN L193 SmtUtils]: Spent 275.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 10:53:36,924 WARN L193 SmtUtils]: Spent 258.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-20 10:53:37,460 WARN L193 SmtUtils]: Spent 531.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2020-07-20 10:53:37,974 WARN L193 SmtUtils]: Spent 509.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 10:53:38,460 WARN L193 SmtUtils]: Spent 481.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 10:53:38,966 WARN L193 SmtUtils]: Spent 501.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-20 10:53:39,479 WARN L193 SmtUtils]: Spent 507.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-20 10:53:39,946 WARN L193 SmtUtils]: Spent 463.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-20 10:53:40,359 WARN L193 SmtUtils]: Spent 409.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-20 10:53:40,767 WARN L193 SmtUtils]: Spent 403.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 10:53:41,152 WARN L193 SmtUtils]: Spent 381.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-20 10:53:43,370 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [707425448] [2020-07-20 10:53:43,370 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 10:53:43,370 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-07-20 10:53:43,370 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [579712776] [2020-07-20 10:53:43,371 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 10:53:43,371 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:53:43,371 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 10:53:43,371 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=374, Unknown=6, NotChecked=0, Total=420 [2020-07-20 10:53:43,371 INFO L87 Difference]: Start difference. First operand 54 states and 57 transitions. Second operand 20 states. [2020-07-20 10:53:56,716 WARN L193 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 11 [2020-07-20 10:54:06,557 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 16 DAG size of output: 12 [2020-07-20 10:54:18,653 WARN L193 SmtUtils]: Spent 595.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 28 [2020-07-20 10:54:24,591 WARN L193 SmtUtils]: Spent 745.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 26 [2020-07-20 10:54:30,871 WARN L193 SmtUtils]: Spent 746.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 27 [2020-07-20 10:54:37,011 WARN L193 SmtUtils]: Spent 712.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 28 [2020-07-20 10:54:43,147 WARN L193 SmtUtils]: Spent 724.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 28 [2020-07-20 10:54:49,653 WARN L193 SmtUtils]: Spent 662.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 28 [2020-07-20 10:54:55,617 WARN L193 SmtUtils]: Spent 505.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 28 [2020-07-20 10:55:07,901 WARN L193 SmtUtils]: Spent 509.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 28 [2020-07-20 10:55:09,682 WARN L193 SmtUtils]: Spent 307.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2020-07-20 10:55:14,431 WARN L193 SmtUtils]: Spent 254.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2020-07-20 10:55:19,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:55:19,895 INFO L93 Difference]: Finished difference Result 75 states and 84 transitions. [2020-07-20 10:55:19,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-20 10:55:19,937 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 49 [2020-07-20 10:55:19,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:55:19,938 INFO L225 Difference]: With dead ends: 75 [2020-07-20 10:55:19,938 INFO L226 Difference]: Without dead ends: 56 [2020-07-20 10:55:19,939 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 57.5s TimeCoverageRelationStatistics Valid=170, Invalid=943, Unknown=9, NotChecked=0, Total=1122 [2020-07-20 10:55:19,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-07-20 10:55:19,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-07-20 10:55:19,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 10:55:19,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 59 transitions. [2020-07-20 10:55:19,948 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 59 transitions. Word has length 49 [2020-07-20 10:55:19,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:55:19,948 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 59 transitions. [2020-07-20 10:55:19,948 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 10:55:19,948 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 59 transitions. [2020-07-20 10:55:19,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-07-20 10:55:19,948 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:55:19,949 INFO L422 BasicCegarLoop]: trace histogram [16, 13, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:55:20,160 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:55:20,161 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:55:20,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:55:20,162 INFO L82 PathProgramCache]: Analyzing trace with hash -1991572610, now seen corresponding path program 16 times [2020-07-20 10:55:20,162 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:55:20,162 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [782129273] [2020-07-20 10:55:20,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:55:20,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:55:20,210 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-20 10:55:20,212 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:55:21,113 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-20 10:55:21,624 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 10:55:47,352 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 10:55:47,352 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:55:47,670 WARN L193 SmtUtils]: Spent 316.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 10:55:47,976 WARN L193 SmtUtils]: Spent 301.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 10:55:48,329 WARN L193 SmtUtils]: Spent 347.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 10:55:48,715 WARN L193 SmtUtils]: Spent 379.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 10:55:49,056 WARN L193 SmtUtils]: Spent 333.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2020-07-20 10:55:49,590 WARN L193 SmtUtils]: Spent 529.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-20 10:55:50,107 WARN L193 SmtUtils]: Spent 511.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-20 10:55:50,662 WARN L193 SmtUtils]: Spent 549.00 ms on a formula simplification that was a NOOP. DAG size: 73 [2020-07-20 10:55:51,155 WARN L193 SmtUtils]: Spent 487.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 10:55:51,594 WARN L193 SmtUtils]: Spent 432.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-20 10:55:51,977 WARN L193 SmtUtils]: Spent 379.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 10:55:52,331 WARN L193 SmtUtils]: Spent 349.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 10:55:52,681 WARN L193 SmtUtils]: Spent 345.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-20 10:55:52,976 WARN L193 SmtUtils]: Spent 290.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 10:55:53,268 WARN L193 SmtUtils]: Spent 288.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 10:55:57,241 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 10:55:57,246 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [782129273] [2020-07-20 10:55:57,246 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 10:55:57,247 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-07-20 10:55:57,247 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1494280296] [2020-07-20 10:55:57,247 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 10:55:57,247 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:55:57,248 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 10:55:57,248 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=417, Unknown=3, NotChecked=0, Total=462 [2020-07-20 10:55:57,248 INFO L87 Difference]: Start difference. First operand 56 states and 59 transitions. Second operand 21 states. [2020-07-20 10:56:11,292 WARN L193 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 11 [2020-07-20 10:56:21,105 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 16 DAG size of output: 12 [2020-07-20 10:56:43,124 WARN L193 SmtUtils]: Spent 1.13 s on a formula simplification. DAG size of input: 79 DAG size of output: 28 [2020-07-20 10:56:46,225 WARN L193 SmtUtils]: Spent 1.27 s on a formula simplification. DAG size of input: 73 DAG size of output: 26 [2020-07-20 10:56:53,182 WARN L193 SmtUtils]: Spent 1.31 s on a formula simplification. DAG size of input: 69 DAG size of output: 27 [2020-07-20 10:57:00,275 WARN L193 SmtUtils]: Spent 982.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 28 [2020-07-20 10:57:06,110 WARN L193 SmtUtils]: Spent 1.45 s on a formula simplification. DAG size of input: 58 DAG size of output: 28 [2020-07-20 10:57:11,008 WARN L193 SmtUtils]: Spent 722.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 28 [2020-07-20 10:57:14,879 WARN L193 SmtUtils]: Spent 787.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 28 [2020-07-20 10:57:20,190 WARN L193 SmtUtils]: Spent 857.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 28 [2020-07-20 10:57:25,263 WARN L193 SmtUtils]: Spent 649.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 28 [2020-07-20 10:57:28,274 WARN L193 SmtUtils]: Spent 372.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2020-07-20 10:57:41,795 WARN L193 SmtUtils]: Spent 1.59 s on a formula simplification that was a NOOP. DAG size: 28 [2020-07-20 10:57:49,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:57:49,768 INFO L93 Difference]: Finished difference Result 74 states and 81 transitions. [2020-07-20 10:57:49,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-20 10:57:49,805 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 51 [2020-07-20 10:57:49,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:57:49,806 INFO L225 Difference]: With dead ends: 74 [2020-07-20 10:57:49,806 INFO L226 Difference]: Without dead ends: 61 [2020-07-20 10:57:49,807 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 81.3s TimeCoverageRelationStatistics Valid=194, Invalid=1056, Unknown=10, NotChecked=0, Total=1260 [2020-07-20 10:57:49,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-07-20 10:57:49,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 58. [2020-07-20 10:57:49,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-07-20 10:57:49,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 62 transitions. [2020-07-20 10:57:49,818 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 62 transitions. Word has length 51 [2020-07-20 10:57:49,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:57:49,818 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 62 transitions. [2020-07-20 10:57:49,818 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 10:57:49,818 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 62 transitions. [2020-07-20 10:57:49,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-07-20 10:57:49,819 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:57:49,819 INFO L422 BasicCegarLoop]: trace histogram [17, 14, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:57:50,032 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:57:50,034 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:57:50,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:57:50,034 INFO L82 PathProgramCache]: Analyzing trace with hash 1252335835, now seen corresponding path program 17 times [2020-07-20 10:57:50,035 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:57:50,035 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1213837011] [2020-07-20 10:57:50,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:57:50,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:57:50,088 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 10:57:50,089 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:57:51,188 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-20 10:57:51,672 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 10:58:02,321 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 21 [2020-07-20 10:58:21,174 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 22 [2020-07-20 10:58:21,280 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 10:58:21,280 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:58:21,699 WARN L193 SmtUtils]: Spent 416.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-20 10:58:22,106 WARN L193 SmtUtils]: Spent 400.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-20 10:58:22,575 WARN L193 SmtUtils]: Spent 461.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 10:58:23,041 WARN L193 SmtUtils]: Spent 458.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 10:58:23,472 WARN L193 SmtUtils]: Spent 422.00 ms on a formula simplification that was a NOOP. DAG size: 83 [2020-07-20 10:58:24,439 WARN L193 SmtUtils]: Spent 961.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-20 10:58:25,347 WARN L193 SmtUtils]: Spent 900.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2020-07-20 10:58:26,190 WARN L193 SmtUtils]: Spent 836.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2020-07-20 10:58:26,999 WARN L193 SmtUtils]: Spent 802.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-20 10:58:27,779 WARN L193 SmtUtils]: Spent 774.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 10:58:28,508 WARN L193 SmtUtils]: Spent 723.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-20 10:58:29,206 WARN L193 SmtUtils]: Spent 691.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 10:58:29,877 WARN L193 SmtUtils]: Spent 665.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 10:58:30,460 WARN L193 SmtUtils]: Spent 577.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 10:58:30,996 WARN L193 SmtUtils]: Spent 530.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 10:58:31,469 WARN L193 SmtUtils]: Spent 466.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-20 10:58:35,052 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 33 [2020-07-20 10:58:35,058 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1213837011] [2020-07-20 10:58:35,058 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 10:58:35,058 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-07-20 10:58:35,059 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [880829653] [2020-07-20 10:58:35,059 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 10:58:35,059 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:58:35,060 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 10:58:35,060 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=460, Unknown=2, NotChecked=0, Total=506 [2020-07-20 10:58:35,060 INFO L87 Difference]: Start difference. First operand 58 states and 62 transitions. Second operand 22 states. [2020-07-20 10:58:49,318 WARN L193 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 11 [2020-07-20 10:59:02,936 WARN L193 SmtUtils]: Spent 224.00 ms on a formula simplification. DAG size of input: 16 DAG size of output: 12 [2020-07-20 10:59:26,023 WARN L193 SmtUtils]: Spent 978.00 ms on a formula simplification. DAG size of input: 85 DAG size of output: 28 [2020-07-20 10:59:32,050 WARN L193 SmtUtils]: Spent 1.60 s on a formula simplification. DAG size of input: 79 DAG size of output: 26 [2020-07-20 10:59:35,430 WARN L193 SmtUtils]: Spent 1.46 s on a formula simplification. DAG size of input: 75 DAG size of output: 27 [2020-07-20 10:59:41,441 WARN L193 SmtUtils]: Spent 1.47 s on a formula simplification. DAG size of input: 70 DAG size of output: 28 [2020-07-20 10:59:50,652 WARN L193 SmtUtils]: Spent 1.36 s on a formula simplification. DAG size of input: 64 DAG size of output: 28 [2020-07-20 11:00:00,966 WARN L193 SmtUtils]: Spent 1.07 s on a formula simplification. DAG size of input: 58 DAG size of output: 28