/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 22:12:47,748 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 22:12:47,751 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 22:12:47,776 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 22:12:47,776 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 22:12:47,779 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 22:12:47,782 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 22:12:47,799 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 22:12:47,801 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 22:12:47,803 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 22:12:47,804 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 22:12:47,805 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 22:12:47,806 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 22:12:47,809 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 22:12:47,811 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 22:12:47,813 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 22:12:47,815 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 22:12:47,816 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 22:12:47,818 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 22:12:47,822 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 22:12:47,825 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 22:12:47,826 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 22:12:47,828 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 22:12:47,829 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 22:12:47,832 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-20 22:12:47,832 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-20 22:12:47,832 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-20 22:12:47,834 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-20 22:12:47,834 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-20 22:12:47,836 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-20 22:12:47,836 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-20 22:12:47,837 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-20 22:12:47,838 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-20 22:12:47,840 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-20 22:12:47,841 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-20 22:12:47,842 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-20 22:12:47,843 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-20 22:12:47,843 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-20 22:12:47,844 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 22:12:47,845 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 22:12:47,846 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 22:12:47,847 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 22:12:47,864 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 22:12:47,865 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 22:12:47,866 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 22:12:47,867 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 22:12:47,867 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 22:12:47,867 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 22:12:47,867 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 22:12:47,867 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 22:12:47,868 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 22:12:47,868 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 22:12:47,868 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 22:12:47,868 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 22:12:47,868 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 22:12:47,869 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 22:12:47,869 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 22:12:47,869 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 22:12:47,869 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 22:12:47,870 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 22:12:47,870 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 22:12:47,870 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 22:12:47,870 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 22:12:47,870 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 22:12:47,871 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 22:12:47,871 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 22:12:47,871 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 22:12:47,871 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 22:12:47,871 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:12:47,872 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 22:12:47,872 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 22:12:47,872 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> DAGSIZE Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 22:12:48,305 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 22:12:48,338 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 22:12:48,343 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 22:12:48,346 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 22:12:48,346 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 22:12:48,349 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-07-20 22:12:48,457 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d995d3f23/e9e098762e1d403294dbb2beed862187/FLAGa5ae11c3a [2020-07-20 22:12:49,089 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 22:12:49,091 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-07-20 22:12:49,099 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d995d3f23/e9e098762e1d403294dbb2beed862187/FLAGa5ae11c3a [2020-07-20 22:12:49,425 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d995d3f23/e9e098762e1d403294dbb2beed862187 [2020-07-20 22:12:49,434 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 22:12:49,437 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 22:12:49,438 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 22:12:49,438 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 22:12:49,441 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 22:12:49,442 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 10:12:49" (1/1) ... [2020-07-20 22:12:49,445 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@f4b94ba and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:12:49, skipping insertion in model container [2020-07-20 22:12:49,445 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 10:12:49" (1/1) ... [2020-07-20 22:12:49,453 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 22:12:49,471 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 22:12:49,676 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 22:12:49,683 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 22:12:49,702 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 22:12:49,718 INFO L208 MainTranslator]: Completed translation [2020-07-20 22:12:49,718 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:12:49 WrapperNode [2020-07-20 22:12:49,719 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 22:12:49,719 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 22:12:49,719 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 22:12:49,720 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 22:12:49,809 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:12:49" (1/1) ... [2020-07-20 22:12:49,810 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:12:49" (1/1) ... [2020-07-20 22:12:49,820 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:12:49" (1/1) ... [2020-07-20 22:12:49,821 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:12:49" (1/1) ... [2020-07-20 22:12:49,829 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:12:49" (1/1) ... [2020-07-20 22:12:49,834 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:12:49" (1/1) ... [2020-07-20 22:12:49,835 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:12:49" (1/1) ... [2020-07-20 22:12:49,838 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 22:12:49,838 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 22:12:49,838 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 22:12:49,838 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 22:12:49,839 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:12:49" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 22:12:49,904 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 22:12:49,904 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 22:12:49,904 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 22:12:49,904 INFO L138 BoogieDeclarations]: Found implementation of procedure init [2020-07-20 22:12:49,904 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 22:12:49,905 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 22:12:49,905 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 22:12:49,905 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-07-20 22:12:49,905 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_pointer [2020-07-20 22:12:49,905 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-07-20 22:12:49,905 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-07-20 22:12:49,905 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-07-20 22:12:49,906 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 22:12:49,906 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-20 22:12:49,906 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-07-20 22:12:49,906 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-20 22:12:49,906 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 22:12:49,907 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 22:12:50,174 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 22:12:50,174 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-07-20 22:12:50,180 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 10:12:50 BoogieIcfgContainer [2020-07-20 22:12:50,180 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 22:12:50,181 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 22:12:50,181 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 22:12:50,184 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 22:12:50,185 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 10:12:49" (1/3) ... [2020-07-20 22:12:50,185 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4e5c4c7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 10:12:50, skipping insertion in model container [2020-07-20 22:12:50,186 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:12:49" (2/3) ... [2020-07-20 22:12:50,186 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4e5c4c7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 10:12:50, skipping insertion in model container [2020-07-20 22:12:50,186 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 10:12:50" (3/3) ... [2020-07-20 22:12:50,188 INFO L109 eAbstractionObserver]: Analyzing ICFG flag_loopdep.i [2020-07-20 22:12:50,199 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 22:12:50,206 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 22:12:50,223 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 22:12:50,277 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 22:12:50,278 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 22:12:50,278 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 22:12:50,278 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 22:12:50,278 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 22:12:50,279 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 22:12:50,279 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 22:12:50,279 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 22:12:50,298 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-20 22:12:50,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 22:12:50,303 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:12:50,304 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] [2020-07-20 22:12:50,304 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:12:50,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:12:50,309 INFO L82 PathProgramCache]: Analyzing trace with hash 1059974619, now seen corresponding path program 1 times [2020-07-20 22:12:50,316 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:12:50,317 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1511629755] [2020-07-20 22:12:50,317 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:12:50,411 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 22:12:50,411 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:12:50,414 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 22:12:50,420 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:12:50,488 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:12:50,488 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 22:12:50,489 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1511629755] [2020-07-20 22:12:50,490 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 22:12:50,490 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 22:12:50,491 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [511466134] [2020-07-20 22:12:50,496 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 22:12:50,497 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:12:50,510 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 22:12:50,511 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 22:12:50,513 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 4 states. [2020-07-20 22:12:50,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:12:50,581 INFO L93 Difference]: Finished difference Result 60 states and 77 transitions. [2020-07-20 22:12:50,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 22:12:50,583 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-07-20 22:12:50,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:12:50,592 INFO L225 Difference]: With dead ends: 60 [2020-07-20 22:12:50,592 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 22:12:50,596 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 22:12:50,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 22:12:50,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-07-20 22:12:50,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-07-20 22:12:50,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-07-20 22:12:50,637 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 20 [2020-07-20 22:12:50,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:12:50,638 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-07-20 22:12:50,638 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 22:12:50,638 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-07-20 22:12:50,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 22:12:50,639 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:12:50,640 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, 1] [2020-07-20 22:12:50,854 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:12:50,854 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:12:50,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:12:50,855 INFO L82 PathProgramCache]: Analyzing trace with hash 1782065480, now seen corresponding path program 1 times [2020-07-20 22:12:50,855 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:12:50,856 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [834036394] [2020-07-20 22:12:50,856 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:12:50,912 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 22:12:50,913 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:12:50,914 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 22:12:50,916 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:12:50,938 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 22:12:50,939 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 22:12:50,945 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [834036394] [2020-07-20 22:12:50,946 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 22:12:50,946 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 22:12:50,946 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1929747896] [2020-07-20 22:12:50,948 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 22:12:50,948 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:12:50,948 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 22:12:50,949 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 22:12:50,949 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 3 states. [2020-07-20 22:12:50,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:12:50,993 INFO L93 Difference]: Finished difference Result 49 states and 58 transitions. [2020-07-20 22:12:50,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 22:12:50,994 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-20 22:12:50,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:12:50,998 INFO L225 Difference]: With dead ends: 49 [2020-07-20 22:12:50,998 INFO L226 Difference]: Without dead ends: 37 [2020-07-20 22:12:51,000 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 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 22:12:51,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-20 22:12:51,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 30. [2020-07-20 22:12:51,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 22:12:51,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2020-07-20 22:12:51,023 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 22 [2020-07-20 22:12:51,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:12:51,025 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2020-07-20 22:12:51,025 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 22:12:51,025 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2020-07-20 22:12:51,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 22:12:51,029 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:12:51,029 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, 1, 1, 1, 1] [2020-07-20 22:12:51,229 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:12:51,230 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:12:51,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:12:51,231 INFO L82 PathProgramCache]: Analyzing trace with hash 413319423, now seen corresponding path program 1 times [2020-07-20 22:12:51,231 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:12:51,232 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [387075143] [2020-07-20 22:12:51,232 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:12:51,274 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 22:12:51,275 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:12:51,276 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 22:12:51,278 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:12:51,302 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 22:12:51,303 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 22:12:51,303 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [387075143] [2020-07-20 22:12:51,303 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 22:12:51,304 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 22:12:51,304 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [423994525] [2020-07-20 22:12:51,304 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 22:12:51,305 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:12:51,305 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 22:12:51,307 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 22:12:51,307 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand 3 states. [2020-07-20 22:12:51,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:12:51,330 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-07-20 22:12:51,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 22:12:51,331 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-20 22:12:51,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:12:51,332 INFO L225 Difference]: With dead ends: 48 [2020-07-20 22:12:51,333 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 22:12:51,333 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 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 22:12:51,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 22:12:51,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-20 22:12:51,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 22:12:51,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 33 transitions. [2020-07-20 22:12:51,340 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 33 transitions. Word has length 25 [2020-07-20 22:12:51,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:12:51,340 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 33 transitions. [2020-07-20 22:12:51,341 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 22:12:51,341 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 33 transitions. [2020-07-20 22:12:51,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 22:12:51,342 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:12:51,342 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, 1, 1, 1, 1] [2020-07-20 22:12:51,557 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:12:51,558 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:12:51,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:12:51,559 INFO L82 PathProgramCache]: Analyzing trace with hash 20292413, now seen corresponding path program 1 times [2020-07-20 22:12:51,560 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:12:51,560 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1497373516] [2020-07-20 22:12:51,561 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:12:51,641 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 22:12:51,642 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:12:51,642 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 22:12:51,647 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:12:51,671 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 22:12:51,672 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:12:51,720 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 22:12:51,721 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1497373516] [2020-07-20 22:12:51,721 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:12:51,721 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-07-20 22:12:51,722 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [372085666] [2020-07-20 22:12:51,722 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 22:12:51,722 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:12:51,723 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 22:12:51,723 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-20 22:12:51,723 INFO L87 Difference]: Start difference. First operand 30 states and 33 transitions. Second operand 6 states. [2020-07-20 22:12:51,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:12:51,805 INFO L93 Difference]: Finished difference Result 67 states and 80 transitions. [2020-07-20 22:12:51,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 22:12:51,806 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 25 [2020-07-20 22:12:51,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:12:51,807 INFO L225 Difference]: With dead ends: 67 [2020-07-20 22:12:51,807 INFO L226 Difference]: Without dead ends: 55 [2020-07-20 22:12:51,808 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-20 22:12:51,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-07-20 22:12:51,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 39. [2020-07-20 22:12:51,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-07-20 22:12:51,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 42 transitions. [2020-07-20 22:12:51,816 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 42 transitions. Word has length 25 [2020-07-20 22:12:51,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:12:51,816 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 42 transitions. [2020-07-20 22:12:51,817 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 22:12:51,817 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 42 transitions. [2020-07-20 22:12:51,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-07-20 22:12:51,818 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:12:51,818 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:12:52,029 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:12:52,029 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:12:52,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:12:52,030 INFO L82 PathProgramCache]: Analyzing trace with hash 1921138952, now seen corresponding path program 2 times [2020-07-20 22:12:52,030 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:12:52,031 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [192467774] [2020-07-20 22:12:52,031 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:12:52,108 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:12:52,108 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:12:52,109 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 22:12:52,112 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:12:52,169 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 22:12:52,169 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:12:52,259 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 22:12:52,259 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [192467774] [2020-07-20 22:12:52,260 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:12:52,260 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-20 22:12:52,260 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2121273962] [2020-07-20 22:12:52,261 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 22:12:52,261 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:12:52,261 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 22:12:52,262 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-07-20 22:12:52,262 INFO L87 Difference]: Start difference. First operand 39 states and 42 transitions. Second operand 12 states. [2020-07-20 22:12:52,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:12:52,418 INFO L93 Difference]: Finished difference Result 115 states and 143 transitions. [2020-07-20 22:12:52,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 22:12:52,419 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2020-07-20 22:12:52,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:12:52,421 INFO L225 Difference]: With dead ends: 115 [2020-07-20 22:12:52,421 INFO L226 Difference]: Without dead ends: 103 [2020-07-20 22:12:52,422 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-07-20 22:12:52,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-20 22:12:52,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 57. [2020-07-20 22:12:52,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-07-20 22:12:52,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2020-07-20 22:12:52,433 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 34 [2020-07-20 22:12:52,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:12:52,434 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2020-07-20 22:12:52,434 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 22:12:52,434 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2020-07-20 22:12:52,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-07-20 22:12:52,435 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:12:52,436 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:12:52,648 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:12:52,649 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:12:52,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:12:52,650 INFO L82 PathProgramCache]: Analyzing trace with hash 1101912232, now seen corresponding path program 3 times [2020-07-20 22:12:52,650 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:12:52,651 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1240436744] [2020-07-20 22:12:52,651 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:12:52,722 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:12:52,722 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:12:52,724 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 22:12:52,727 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:12:52,772 INFO L134 CoverageAnalysis]: Checked inductivity of 146 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2020-07-20 22:12:52,772 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:12:52,860 INFO L134 CoverageAnalysis]: Checked inductivity of 146 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2020-07-20 22:12:52,860 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1240436744] [2020-07-20 22:12:52,861 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:12:52,861 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2020-07-20 22:12:52,861 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [567615082] [2020-07-20 22:12:52,862 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 22:12:52,862 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:12:52,862 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 22:12:52,863 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2020-07-20 22:12:52,863 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand 8 states. [2020-07-20 22:12:52,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:12:52,914 INFO L93 Difference]: Finished difference Result 111 states and 119 transitions. [2020-07-20 22:12:52,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 22:12:52,915 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 52 [2020-07-20 22:12:52,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:12:52,916 INFO L225 Difference]: With dead ends: 111 [2020-07-20 22:12:52,916 INFO L226 Difference]: Without dead ends: 63 [2020-07-20 22:12:52,917 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 96 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=31, Invalid=41, Unknown=0, NotChecked=0, Total=72 [2020-07-20 22:12:52,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-20 22:12:52,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2020-07-20 22:12:52,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-07-20 22:12:52,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 66 transitions. [2020-07-20 22:12:52,926 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 66 transitions. Word has length 52 [2020-07-20 22:12:52,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:12:52,927 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 66 transitions. [2020-07-20 22:12:52,927 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 22:12:52,927 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 66 transitions. [2020-07-20 22:12:52,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-07-20 22:12:52,929 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:12:52,929 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:12:53,142 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:12:53,143 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:12:53,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:12:53,144 INFO L82 PathProgramCache]: Analyzing trace with hash 586494510, now seen corresponding path program 4 times [2020-07-20 22:12:53,144 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:12:53,144 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [583092631] [2020-07-20 22:12:53,145 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:12:53,311 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:12:53,311 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:12:53,313 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 22:12:53,319 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:12:53,414 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2020-07-20 22:12:53,414 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:12:53,594 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2020-07-20 22:12:53,595 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [583092631] [2020-07-20 22:12:53,595 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:12:53,595 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2020-07-20 22:12:53,595 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1001808902] [2020-07-20 22:12:53,596 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 22:12:53,598 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:12:53,599 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 22:12:53,599 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=101, Unknown=0, NotChecked=0, Total=182 [2020-07-20 22:12:53,599 INFO L87 Difference]: Start difference. First operand 63 states and 66 transitions. Second operand 14 states. [2020-07-20 22:12:53,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:12:53,695 INFO L93 Difference]: Finished difference Result 123 states and 134 transitions. [2020-07-20 22:12:53,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 22:12:53,695 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 58 [2020-07-20 22:12:53,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:12:53,697 INFO L225 Difference]: With dead ends: 123 [2020-07-20 22:12:53,697 INFO L226 Difference]: Without dead ends: 75 [2020-07-20 22:12:53,698 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 102 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=91, Invalid=119, Unknown=0, NotChecked=0, Total=210 [2020-07-20 22:12:53,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-07-20 22:12:53,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2020-07-20 22:12:53,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-07-20 22:12:53,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 78 transitions. [2020-07-20 22:12:53,707 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 78 transitions. Word has length 58 [2020-07-20 22:12:53,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:12:53,707 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 78 transitions. [2020-07-20 22:12:53,708 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 22:12:53,708 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 78 transitions. [2020-07-20 22:12:53,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-07-20 22:12:53,709 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:12:53,709 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:12:53,923 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:12:53,924 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:12:53,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:12:53,925 INFO L82 PathProgramCache]: Analyzing trace with hash 45617082, now seen corresponding path program 5 times [2020-07-20 22:12:53,925 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:12:53,926 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [53650146] [2020-07-20 22:12:53,926 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:12:55,163 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 22:12:55,164 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:12:55,175 INFO L263 TraceCheckSpWp]: Trace formula consists of 326 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 22:12:55,179 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:12:55,284 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-07-20 22:12:55,285 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:12:55,553 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-07-20 22:12:55,553 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [53650146] [2020-07-20 22:12:55,554 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:12:55,554 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 24 [2020-07-20 22:12:55,554 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1338935477] [2020-07-20 22:12:55,555 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 22:12:55,555 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:12:55,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 22:12:55,556 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-07-20 22:12:55,556 INFO L87 Difference]: Start difference. First operand 75 states and 78 transitions. Second operand 24 states. [2020-07-20 22:12:55,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:12:55,872 INFO L93 Difference]: Finished difference Result 229 states and 287 transitions. [2020-07-20 22:12:55,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-20 22:12:55,873 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 70 [2020-07-20 22:12:55,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:12:55,875 INFO L225 Difference]: With dead ends: 229 [2020-07-20 22:12:55,875 INFO L226 Difference]: Without dead ends: 217 [2020-07-20 22:12:55,877 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-07-20 22:12:55,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2020-07-20 22:12:55,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 111. [2020-07-20 22:12:55,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2020-07-20 22:12:55,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 114 transitions. [2020-07-20 22:12:55,895 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 114 transitions. Word has length 70 [2020-07-20 22:12:55,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:12:55,896 INFO L479 AbstractCegarLoop]: Abstraction has 111 states and 114 transitions. [2020-07-20 22:12:55,896 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 22:12:55,896 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 114 transitions. [2020-07-20 22:12:55,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-07-20 22:12:55,898 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:12:55,898 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 22, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:12:56,106 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:12:56,107 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:12:56,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:12:56,108 INFO L82 PathProgramCache]: Analyzing trace with hash -690575878, now seen corresponding path program 6 times [2020-07-20 22:12:56,108 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:12:56,109 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [460575853] [2020-07-20 22:12:56,109 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:12:58,895 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 22:12:58,895 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:12:58,920 INFO L263 TraceCheckSpWp]: Trace formula consists of 458 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 22:12:58,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:12:59,309 INFO L134 CoverageAnalysis]: Checked inductivity of 815 backedges. 0 proven. 715 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-07-20 22:12:59,309 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:13:00,262 INFO L134 CoverageAnalysis]: Checked inductivity of 815 backedges. 0 proven. 715 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-07-20 22:13:00,264 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [460575853] [2020-07-20 22:13:00,264 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:13:00,265 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 48 [2020-07-20 22:13:00,265 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [303752286] [2020-07-20 22:13:00,266 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-07-20 22:13:00,266 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:13:00,267 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-07-20 22:13:00,268 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2020-07-20 22:13:00,269 INFO L87 Difference]: Start difference. First operand 111 states and 114 transitions. Second operand 48 states. [2020-07-20 22:13:01,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:13:01,118 INFO L93 Difference]: Finished difference Result 421 states and 539 transitions. [2020-07-20 22:13:01,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-20 22:13:01,118 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 106 [2020-07-20 22:13:01,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:13:01,122 INFO L225 Difference]: With dead ends: 421 [2020-07-20 22:13:01,122 INFO L226 Difference]: Without dead ends: 409 [2020-07-20 22:13:01,124 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 165 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2020-07-20 22:13:01,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 409 states. [2020-07-20 22:13:01,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 409 to 183. [2020-07-20 22:13:01,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2020-07-20 22:13:01,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 186 transitions. [2020-07-20 22:13:01,154 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 186 transitions. Word has length 106 [2020-07-20 22:13:01,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:13:01,155 INFO L479 AbstractCegarLoop]: Abstraction has 183 states and 186 transitions. [2020-07-20 22:13:01,155 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-07-20 22:13:01,155 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 186 transitions. [2020-07-20 22:13:01,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2020-07-20 22:13:01,163 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:13:01,163 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 46, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:13:01,363 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:13:01,364 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:13:01,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:13:01,365 INFO L82 PathProgramCache]: Analyzing trace with hash 1447654010, now seen corresponding path program 7 times [2020-07-20 22:13:01,365 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:13:01,366 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1895020720] [2020-07-20 22:13:01,366 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:20:26,436 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 22:20:26,436 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:20:28,281 INFO L263 TraceCheckSpWp]: Trace formula consists of 722 conjuncts, 48 conjunts are in the unsatisfiable core [2020-07-20 22:20:28,286 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:20:29,606 INFO L134 CoverageAnalysis]: Checked inductivity of 3251 backedges. 0 proven. 3151 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-07-20 22:20:29,607 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:20:33,193 INFO L134 CoverageAnalysis]: Checked inductivity of 3251 backedges. 0 proven. 3151 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-07-20 22:20:33,193 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1895020720] [2020-07-20 22:20:33,193 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:20:33,194 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49] total 96 [2020-07-20 22:20:33,194 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1019214469] [2020-07-20 22:20:33,195 INFO L459 AbstractCegarLoop]: Interpolant automaton has 96 states [2020-07-20 22:20:33,195 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:20:33,196 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2020-07-20 22:20:33,200 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2020-07-20 22:20:33,201 INFO L87 Difference]: Start difference. First operand 183 states and 186 transitions. Second operand 96 states. [2020-07-20 22:20:35,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:20:35,996 INFO L93 Difference]: Finished difference Result 805 states and 1043 transitions. [2020-07-20 22:20:35,996 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2020-07-20 22:20:35,996 INFO L78 Accepts]: Start accepts. Automaton has 96 states. Word has length 178 [2020-07-20 22:20:35,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:20:36,002 INFO L225 Difference]: With dead ends: 805 [2020-07-20 22:20:36,002 INFO L226 Difference]: Without dead ends: 793 [2020-07-20 22:20:36,006 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 355 GetRequests, 261 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2020-07-20 22:20:36,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 793 states. [2020-07-20 22:20:36,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 793 to 327. [2020-07-20 22:20:36,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 327 states. [2020-07-20 22:20:36,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 327 states to 327 states and 330 transitions. [2020-07-20 22:20:36,044 INFO L78 Accepts]: Start accepts. Automaton has 327 states and 330 transitions. Word has length 178 [2020-07-20 22:20:36,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:20:36,045 INFO L479 AbstractCegarLoop]: Abstraction has 327 states and 330 transitions. [2020-07-20 22:20:36,045 INFO L480 AbstractCegarLoop]: Interpolant automaton has 96 states. [2020-07-20 22:20:36,045 INFO L276 IsEmpty]: Start isEmpty. Operand 327 states and 330 transitions. [2020-07-20 22:20:36,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 323 [2020-07-20 22:20:36,051 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:20:36,051 INFO L422 BasicCegarLoop]: trace histogram [94, 94, 94, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:20:36,252 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:20:36,253 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:20:36,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:20:36,253 INFO L82 PathProgramCache]: Analyzing trace with hash 969247610, now seen corresponding path program 8 times [2020-07-20 22:20:36,254 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:20:36,254 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [287967613] [2020-07-20 22:20:36,255 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in