/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 NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/cggmp2005b.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 16:58:23,078 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 16:58:23,081 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 16:58:23,097 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 16:58:23,097 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 16:58:23,098 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 16:58:23,099 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 16:58:23,101 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 16:58:23,103 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 16:58:23,103 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 16:58:23,104 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 16:58:23,106 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 16:58:23,106 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 16:58:23,107 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 16:58:23,108 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 16:58:23,109 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 16:58:23,110 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 16:58:23,111 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 16:58:23,112 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 16:58:23,115 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 16:58:23,116 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 16:58:23,117 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 16:58:23,118 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 16:58:23,119 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 16:58:23,122 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-21 16:58:23,122 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-21 16:58:23,122 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-21 16:58:23,123 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-21 16:58:23,123 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-21 16:58:23,124 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-21 16:58:23,125 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-21 16:58:23,125 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-21 16:58:23,126 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-21 16:58:23,127 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-21 16:58:23,128 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-21 16:58:23,128 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-21 16:58:23,129 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-21 16:58:23,129 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-21 16:58:23,129 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 16:58:23,130 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 16:58:23,131 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 16:58:23,132 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 16:58:23,147 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 16:58:23,147 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 16:58:23,148 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 16:58:23,149 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 16:58:23,149 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 16:58:23,149 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 16:58:23,149 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 16:58:23,150 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 16:58:23,150 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 16:58:23,150 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 16:58:23,150 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 16:58:23,150 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 16:58:23,150 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 16:58:23,151 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 16:58:23,151 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 16:58:23,151 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 16:58:23,151 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 16:58:23,152 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 16:58:23,152 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 16:58:23,152 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 16:58:23,152 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 16:58:23,152 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:58:23,153 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 16:58:23,153 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 16:58:23,153 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 16:58:23,153 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 16:58:23,153 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:23,154 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 16:58:23,154 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 16:58:23,154 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 -> NUM_VARIABLES 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 -> 2 [2020-07-21 16:58:23,454 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 16:58:23,466 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 16:58:23,470 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 16:58:23,472 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 16:58:23,472 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 16:58:23,473 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/cggmp2005b.i [2020-07-21 16:58:23,555 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6c2f62f1f/912b527237ac4693b2bf78c6aae4d70f/FLAGdc0abdefd [2020-07-21 16:58:24,017 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 16:58:24,017 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-lit/cggmp2005b.i [2020-07-21 16:58:24,024 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6c2f62f1f/912b527237ac4693b2bf78c6aae4d70f/FLAGdc0abdefd [2020-07-21 16:58:24,404 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6c2f62f1f/912b527237ac4693b2bf78c6aae4d70f [2020-07-21 16:58:24,415 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 16:58:24,418 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 16:58:24,419 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 16:58:24,419 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 16:58:24,423 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 16:58:24,424 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:58:24" (1/1) ... [2020-07-21 16:58:24,427 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@46a75738 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:58:24, skipping insertion in model container [2020-07-21 16:58:24,428 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:58:24" (1/1) ... [2020-07-21 16:58:24,436 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 16:58:24,454 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 16:58:24,640 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:58:24,645 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 16:58:24,659 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:58:24,671 INFO L208 MainTranslator]: Completed translation [2020-07-21 16:58:24,672 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:58:24 WrapperNode [2020-07-21 16:58:24,672 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 16:58:24,672 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 16:58:24,672 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 16:58:24,673 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 16:58:24,682 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:58:24" (1/1) ... [2020-07-21 16:58:24,683 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:58:24" (1/1) ... [2020-07-21 16:58:24,688 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:58:24" (1/1) ... [2020-07-21 16:58:24,688 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:58:24" (1/1) ... [2020-07-21 16:58:24,692 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:58:24" (1/1) ... [2020-07-21 16:58:24,697 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:58:24" (1/1) ... [2020-07-21 16:58:24,698 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:58:24" (1/1) ... [2020-07-21 16:58:24,784 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 16:58:24,787 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 16:58:24,787 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 16:58:24,788 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 16:58:24,789 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:58:24" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:58:24,858 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 16:58:24,858 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 16:58:24,859 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 16:58:24,859 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 16:58:24,859 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 16:58:24,859 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 16:58:24,859 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 16:58:24,859 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 16:58:24,859 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 16:58:24,860 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 16:58:24,860 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 16:58:24,860 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 16:58:24,860 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 16:58:25,071 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 16:58:25,072 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-07-21 16:58:25,075 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:58:25 BoogieIcfgContainer [2020-07-21 16:58:25,076 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 16:58:25,077 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 16:58:25,077 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 16:58:25,080 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 16:58:25,080 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 04:58:24" (1/3) ... [2020-07-21 16:58:25,081 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7be5b5ed and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:58:25, skipping insertion in model container [2020-07-21 16:58:25,082 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:58:24" (2/3) ... [2020-07-21 16:58:25,082 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7be5b5ed and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:58:25, skipping insertion in model container [2020-07-21 16:58:25,082 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:58:25" (3/3) ... [2020-07-21 16:58:25,084 INFO L109 eAbstractionObserver]: Analyzing ICFG cggmp2005b.i [2020-07-21 16:58:25,095 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 16:58:25,104 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 16:58:25,120 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 16:58:25,153 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 16:58:25,153 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 16:58:25,153 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 16:58:25,153 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 16:58:25,154 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 16:58:25,154 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 16:58:25,154 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 16:58:25,154 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 16:58:25,205 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-07-21 16:58:25,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-07-21 16:58:25,217 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:58:25,218 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:58:25,220 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:58:25,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:58:25,228 INFO L82 PathProgramCache]: Analyzing trace with hash -1039733575, now seen corresponding path program 1 times [2020-07-21 16:58:25,237 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:58:25,238 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [694110306] [2020-07-21 16:58:25,238 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:25,307 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:58:25,307 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:58:25,310 INFO L263 TraceCheckSpWp]: Trace formula consists of 26 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-21 16:58:25,315 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:58:25,334 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:58:25,335 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:58:25,336 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [694110306] [2020-07-21 16:58:25,336 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:58:25,337 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-21 16:58:25,338 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1585563881] [2020-07-21 16:58:25,342 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-21 16:58:25,343 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:58:25,354 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-21 16:58:25,355 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 16:58:25,358 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2020-07-21 16:58:25,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:58:25,383 INFO L93 Difference]: Finished difference Result 37 states and 50 transitions. [2020-07-21 16:58:25,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-21 16:58:25,384 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-07-21 16:58:25,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:58:25,393 INFO L225 Difference]: With dead ends: 37 [2020-07-21 16:58:25,394 INFO L226 Difference]: Without dead ends: 14 [2020-07-21 16:58:25,397 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 16:58:25,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-07-21 16:58:25,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-07-21 16:58:25,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-07-21 16:58:25,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2020-07-21 16:58:25,437 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 10 [2020-07-21 16:58:25,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:58:25,438 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2020-07-21 16:58:25,438 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-21 16:58:25,438 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2020-07-21 16:58:25,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-07-21 16:58:25,439 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:58:25,439 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:58:25,640 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:25,641 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:58:25,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:58:25,642 INFO L82 PathProgramCache]: Analyzing trace with hash -1066515684, now seen corresponding path program 1 times [2020-07-21 16:58:25,642 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:58:25,643 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [431648904] [2020-07-21 16:58:25,643 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:25,672 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:58:25,675 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:58:25,676 INFO L263 TraceCheckSpWp]: Trace formula consists of 26 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 16:58:25,678 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:58:25,705 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:58:25,706 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:58:25,706 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [431648904] [2020-07-21 16:58:25,707 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:58:25,707 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:58:25,707 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [79258323] [2020-07-21 16:58:25,709 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:58:25,709 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:58:25,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:58:25,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:58:25,710 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 3 states. [2020-07-21 16:58:25,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:58:25,747 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2020-07-21 16:58:25,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:58:25,749 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-07-21 16:58:25,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:58:25,750 INFO L225 Difference]: With dead ends: 20 [2020-07-21 16:58:25,751 INFO L226 Difference]: Without dead ends: 15 [2020-07-21 16:58:25,752 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:58:25,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-07-21 16:58:25,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-07-21 16:58:25,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-07-21 16:58:25,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-07-21 16:58:25,760 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 10 [2020-07-21 16:58:25,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:58:25,761 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-07-21 16:58:25,761 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:58:25,761 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-07-21 16:58:25,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 16:58:25,762 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:58:25,762 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:58:25,968 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:25,969 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:58:25,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:58:25,970 INFO L82 PathProgramCache]: Analyzing trace with hash 1875131310, now seen corresponding path program 1 times [2020-07-21 16:58:25,970 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:58:25,971 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [447561290] [2020-07-21 16:58:25,971 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:26,008 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:58:26,008 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:58:26,009 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 16:58:26,010 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:58:26,021 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:58:26,021 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:58:26,022 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [447561290] [2020-07-21 16:58:26,022 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:58:26,022 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:58:26,022 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1823936220] [2020-07-21 16:58:26,023 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:58:26,023 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:58:26,023 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:58:26,024 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:58:26,024 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-07-21 16:58:26,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:58:26,035 INFO L93 Difference]: Finished difference Result 25 states and 30 transitions. [2020-07-21 16:58:26,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:58:26,035 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2020-07-21 16:58:26,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:58:26,036 INFO L225 Difference]: With dead ends: 25 [2020-07-21 16:58:26,036 INFO L226 Difference]: Without dead ends: 16 [2020-07-21 16:58:26,037 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:58:26,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-07-21 16:58:26,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-07-21 16:58:26,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-07-21 16:58:26,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-07-21 16:58:26,042 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 14 [2020-07-21 16:58:26,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:58:26,042 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-07-21 16:58:26,043 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:58:26,043 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-07-21 16:58:26,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-21 16:58:26,044 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:58:26,044 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:58:26,244 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:26,245 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:58:26,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:58:26,246 INFO L82 PathProgramCache]: Analyzing trace with hash -224898986, now seen corresponding path program 1 times [2020-07-21 16:58:26,246 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:58:26,247 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [209546425] [2020-07-21 16:58:26,247 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:26,275 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:58:26,275 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:58:26,276 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:58:26,278 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:58:26,301 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 16:58:26,301 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:58:26,342 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 16:58:26,343 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [209546425] [2020-07-21 16:58:26,343 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:58:26,344 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-07-21 16:58:26,344 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2010199910] [2020-07-21 16:58:26,345 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 16:58:26,345 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:58:26,345 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 16:58:26,345 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-21 16:58:26,346 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 6 states. [2020-07-21 16:58:26,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:58:26,389 INFO L93 Difference]: Finished difference Result 33 states and 43 transitions. [2020-07-21 16:58:26,390 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 16:58:26,390 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2020-07-21 16:58:26,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:58:26,391 INFO L225 Difference]: With dead ends: 33 [2020-07-21 16:58:26,392 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 16:58:26,392 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-21 16:58:26,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 16:58:26,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-07-21 16:58:26,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-21 16:58:26,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 36 transitions. [2020-07-21 16:58:26,399 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 36 transitions. Word has length 15 [2020-07-21 16:58:26,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:58:26,400 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 36 transitions. [2020-07-21 16:58:26,400 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 16:58:26,400 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 36 transitions. [2020-07-21 16:58:26,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 16:58:26,401 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:58:26,401 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:58:26,615 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:26,616 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:58:26,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:58:26,617 INFO L82 PathProgramCache]: Analyzing trace with hash 1954211852, now seen corresponding path program 2 times [2020-07-21 16:58:26,617 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:58:26,618 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1408228682] [2020-07-21 16:58:26,619 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:26,645 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:58:26,646 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:58:26,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 16:58:26,648 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:58:26,678 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 18 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 16:58:26,678 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:58:26,727 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 18 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 16:58:26,727 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1408228682] [2020-07-21 16:58:26,728 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:58:26,728 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2020-07-21 16:58:26,728 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [896205351] [2020-07-21 16:58:26,729 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 16:58:26,729 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:58:26,729 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 16:58:26,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2020-07-21 16:58:26,730 INFO L87 Difference]: Start difference. First operand 28 states and 36 transitions. Second operand 8 states. [2020-07-21 16:58:26,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:58:26,788 INFO L93 Difference]: Finished difference Result 49 states and 65 transitions. [2020-07-21 16:58:26,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 16:58:26,789 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 27 [2020-07-21 16:58:26,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:58:26,790 INFO L225 Difference]: With dead ends: 49 [2020-07-21 16:58:26,790 INFO L226 Difference]: Without dead ends: 29 [2020-07-21 16:58:26,791 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2020-07-21 16:58:26,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-07-21 16:58:26,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-07-21 16:58:26,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-07-21 16:58:26,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 37 transitions. [2020-07-21 16:58:26,799 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 37 transitions. Word has length 27 [2020-07-21 16:58:26,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:58:26,799 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 37 transitions. [2020-07-21 16:58:26,799 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 16:58:26,800 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 37 transitions. [2020-07-21 16:58:26,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-21 16:58:26,801 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:58:26,801 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:58:27,015 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:27,016 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:58:27,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:58:27,016 INFO L82 PathProgramCache]: Analyzing trace with hash -1217158044, now seen corresponding path program 3 times [2020-07-21 16:58:27,017 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:58:27,017 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2129837762] [2020-07-21 16:58:27,017 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:27,044 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:58:27,044 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:58:27,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 16:58:27,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:58:27,137 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 13 proven. 3 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-21 16:58:27,138 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:58:27,213 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 13 proven. 3 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-21 16:58:27,214 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2129837762] [2020-07-21 16:58:27,214 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:58:27,214 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 10 [2020-07-21 16:58:27,215 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1826945688] [2020-07-21 16:58:27,215 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 16:58:27,215 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:58:27,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 16:58:27,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2020-07-21 16:58:27,216 INFO L87 Difference]: Start difference. First operand 29 states and 37 transitions. Second operand 10 states. [2020-07-21 16:58:27,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:58:27,327 INFO L93 Difference]: Finished difference Result 52 states and 70 transitions. [2020-07-21 16:58:27,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:58:27,328 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-07-21 16:58:27,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:58:27,329 INFO L225 Difference]: With dead ends: 52 [2020-07-21 16:58:27,329 INFO L226 Difference]: Without dead ends: 32 [2020-07-21 16:58:27,330 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=77, Invalid=105, Unknown=0, NotChecked=0, Total=182 [2020-07-21 16:58:27,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-21 16:58:27,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-07-21 16:58:27,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-07-21 16:58:27,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 40 transitions. [2020-07-21 16:58:27,337 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 40 transitions. Word has length 28 [2020-07-21 16:58:27,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:58:27,337 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 40 transitions. [2020-07-21 16:58:27,338 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 16:58:27,338 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 40 transitions. [2020-07-21 16:58:27,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 16:58:27,339 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:58:27,339 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:58:27,553 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:27,554 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:58:27,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:58:27,554 INFO L82 PathProgramCache]: Analyzing trace with hash -890028532, now seen corresponding path program 4 times [2020-07-21 16:58:27,555 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:58:27,555 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1046432085] [2020-07-21 16:58:27,555 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:27,585 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:58:27,586 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:58:27,587 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 16:58:27,588 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:58:27,675 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 22 proven. 15 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-21 16:58:27,676 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:58:27,816 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 22 proven. 15 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-21 16:58:27,816 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1046432085] [2020-07-21 16:58:27,817 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:58:27,817 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 16 [2020-07-21 16:58:27,817 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [525594034] [2020-07-21 16:58:27,818 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 16:58:27,818 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:58:27,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 16:58:27,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=160, Unknown=0, NotChecked=0, Total=240 [2020-07-21 16:58:27,819 INFO L87 Difference]: Start difference. First operand 32 states and 40 transitions. Second operand 16 states. [2020-07-21 16:58:28,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:58:28,130 INFO L93 Difference]: Finished difference Result 58 states and 79 transitions. [2020-07-21 16:58:28,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 16:58:28,133 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 31 [2020-07-21 16:58:28,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:58:28,134 INFO L225 Difference]: With dead ends: 58 [2020-07-21 16:58:28,134 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 16:58:28,135 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=257, Invalid=393, Unknown=0, NotChecked=0, Total=650 [2020-07-21 16:58:28,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 16:58:28,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-07-21 16:58:28,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-07-21 16:58:28,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 46 transitions. [2020-07-21 16:58:28,144 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 46 transitions. Word has length 31 [2020-07-21 16:58:28,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:58:28,144 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 46 transitions. [2020-07-21 16:58:28,144 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 16:58:28,145 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 46 transitions. [2020-07-21 16:58:28,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-07-21 16:58:28,146 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:58:28,146 INFO L422 BasicCegarLoop]: trace histogram [11, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:58:28,359 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:28,360 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:58:28,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:58:28,361 INFO L82 PathProgramCache]: Analyzing trace with hash 1638735628, now seen corresponding path program 5 times [2020-07-21 16:58:28,361 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:58:28,362 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2002320747] [2020-07-21 16:58:28,362 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:28,402 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:58:28,402 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:58:28,403 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 16:58:28,406 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:58:28,660 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 40 proven. 66 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-21 16:58:28,660 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:58:29,082 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 40 proven. 66 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-21 16:58:29,083 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2002320747] [2020-07-21 16:58:29,083 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:58:29,084 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 28 [2020-07-21 16:58:29,084 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [149806027] [2020-07-21 16:58:29,084 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-07-21 16:58:29,085 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:58:29,085 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-07-21 16:58:29,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=224, Invalid=532, Unknown=0, NotChecked=0, Total=756 [2020-07-21 16:58:29,086 INFO L87 Difference]: Start difference. First operand 38 states and 46 transitions. Second operand 28 states. [2020-07-21 16:58:30,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:58:30,167 INFO L93 Difference]: Finished difference Result 70 states and 97 transitions. [2020-07-21 16:58:30,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-21 16:58:30,168 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 37 [2020-07-21 16:58:30,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:58:30,169 INFO L225 Difference]: With dead ends: 70 [2020-07-21 16:58:30,169 INFO L226 Difference]: Without dead ends: 50 [2020-07-21 16:58:30,171 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 384 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=941, Invalid=1509, Unknown=0, NotChecked=0, Total=2450 [2020-07-21 16:58:30,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-07-21 16:58:30,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-07-21 16:58:30,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-21 16:58:30,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 58 transitions. [2020-07-21 16:58:30,181 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 58 transitions. Word has length 37 [2020-07-21 16:58:30,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:58:30,181 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 58 transitions. [2020-07-21 16:58:30,181 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-07-21 16:58:30,182 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 58 transitions. [2020-07-21 16:58:30,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-07-21 16:58:30,183 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:58:30,183 INFO L422 BasicCegarLoop]: trace histogram [23, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:58:30,396 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:30,397 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:58:30,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:58:30,397 INFO L82 PathProgramCache]: Analyzing trace with hash 363503884, now seen corresponding path program 6 times [2020-07-21 16:58:30,398 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:58:30,398 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [933755086] [2020-07-21 16:58:30,398 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:30,437 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:58:30,438 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:58:30,439 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-21 16:58:30,442 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:58:31,077 INFO L134 CoverageAnalysis]: Checked inductivity of 373 backedges. 76 proven. 276 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-21 16:58:31,078 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:58:32,441 INFO L134 CoverageAnalysis]: Checked inductivity of 373 backedges. 76 proven. 276 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-21 16:58:32,442 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [933755086] [2020-07-21 16:58:32,442 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:58:32,442 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 52 [2020-07-21 16:58:32,442 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [726657063] [2020-07-21 16:58:32,443 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2020-07-21 16:58:32,443 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:58:32,444 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2020-07-21 16:58:32,445 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=728, Invalid=1924, Unknown=0, NotChecked=0, Total=2652 [2020-07-21 16:58:32,445 INFO L87 Difference]: Start difference. First operand 50 states and 58 transitions. Second operand 52 states. [2020-07-21 16:58:36,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:58:36,778 INFO L93 Difference]: Finished difference Result 94 states and 133 transitions. [2020-07-21 16:58:36,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-07-21 16:58:36,779 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 49 [2020-07-21 16:58:36,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:58:36,781 INFO L225 Difference]: With dead ends: 94 [2020-07-21 16:58:36,781 INFO L226 Difference]: Without dead ends: 74 [2020-07-21 16:58:36,784 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1632 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=3605, Invalid=5901, Unknown=0, NotChecked=0, Total=9506 [2020-07-21 16:58:36,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-07-21 16:58:36,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 74. [2020-07-21 16:58:36,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2020-07-21 16:58:36,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 82 transitions. [2020-07-21 16:58:36,796 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 82 transitions. Word has length 49 [2020-07-21 16:58:36,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:58:36,796 INFO L479 AbstractCegarLoop]: Abstraction has 74 states and 82 transitions. [2020-07-21 16:58:36,796 INFO L480 AbstractCegarLoop]: Interpolant automaton has 52 states. [2020-07-21 16:58:36,796 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 82 transitions. [2020-07-21 16:58:36,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-07-21 16:58:36,798 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:58:36,799 INFO L422 BasicCegarLoop]: trace histogram [47, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:58:36,999 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:37,000 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:58:37,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:58:37,001 INFO L82 PathProgramCache]: Analyzing trace with hash -1819499252, now seen corresponding path program 7 times [2020-07-21 16:58:37,001 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:58:37,002 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2030914215] [2020-07-21 16:58:37,002 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:37,055 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:58:37,055 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:58:37,057 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 51 conjunts are in the unsatisfiable core [2020-07-21 16:58:37,061 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:58:39,145 INFO L134 CoverageAnalysis]: Checked inductivity of 1297 backedges. 148 proven. 1128 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-21 16:58:39,146 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:58:44,332 INFO L134 CoverageAnalysis]: Checked inductivity of 1297 backedges. 148 proven. 1128 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-21 16:58:44,332 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2030914215] [2020-07-21 16:58:44,332 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:58:44,332 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51] total 100 [2020-07-21 16:58:44,333 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [121422847] [2020-07-21 16:58:44,333 INFO L459 AbstractCegarLoop]: Interpolant automaton has 100 states [2020-07-21 16:58:44,333 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:58:44,334 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2020-07-21 16:58:44,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2579, Invalid=7321, Unknown=0, NotChecked=0, Total=9900 [2020-07-21 16:58:44,337 INFO L87 Difference]: Start difference. First operand 74 states and 82 transitions. Second operand 100 states. [2020-07-21 16:58:44,502 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 10 [2020-07-21 16:58:44,667 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 145 DAG size of output: 12 [2020-07-21 16:58:44,802 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2020-07-21 16:58:44,938 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 142 DAG size of output: 13 [2020-07-21 16:58:45,076 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 139 DAG size of output: 13 [2020-07-21 16:58:45,240 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 136 DAG size of output: 13 [2020-07-21 16:58:45,412 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 133 DAG size of output: 13 [2020-07-21 16:58:45,586 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 130 DAG size of output: 13 [2020-07-21 16:58:51,584 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 16 [2020-07-21 16:58:51,974 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 186 DAG size of output: 9 [2020-07-21 16:58:52,360 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 9 [2020-07-21 16:58:52,740 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 178 DAG size of output: 9 [2020-07-21 16:58:53,120 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 174 DAG size of output: 9 [2020-07-21 16:58:53,507 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 9 [2020-07-21 16:58:53,887 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 166 DAG size of output: 9 [2020-07-21 16:59:06,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:59:06,225 INFO L93 Difference]: Finished difference Result 142 states and 205 transitions. [2020-07-21 16:59:06,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2020-07-21 16:59:06,226 INFO L78 Accepts]: Start accepts. Automaton has 100 states. Word has length 73 [2020-07-21 16:59:06,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:59:06,227 INFO L225 Difference]: With dead ends: 142 [2020-07-21 16:59:06,228 INFO L226 Difference]: Without dead ends: 122 [2020-07-21 16:59:06,237 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 192 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6768 ImplicationChecksByTransitivity, 28.4s TimeCoverageRelationStatistics Valid=14075, Invalid=23367, Unknown=0, NotChecked=0, Total=37442 [2020-07-21 16:59:06,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2020-07-21 16:59:06,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 122. [2020-07-21 16:59:06,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2020-07-21 16:59:06,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 130 transitions. [2020-07-21 16:59:06,251 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 130 transitions. Word has length 73 [2020-07-21 16:59:06,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:59:06,252 INFO L479 AbstractCegarLoop]: Abstraction has 122 states and 130 transitions. [2020-07-21 16:59:06,252 INFO L480 AbstractCegarLoop]: Interpolant automaton has 100 states. [2020-07-21 16:59:06,252 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 130 transitions. [2020-07-21 16:59:06,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-21 16:59:06,254 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:59:06,254 INFO L422 BasicCegarLoop]: trace histogram [95, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:59:06,467 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:59:06,468 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:59:06,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:59:06,469 INFO L82 PathProgramCache]: Analyzing trace with hash 1693232396, now seen corresponding path program 8 times [2020-07-21 16:59:06,469 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:59:06,470 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1087436824] [2020-07-21 16:59:06,470 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:59:06,544 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:59:06,545 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:59:06,548 INFO L263 TraceCheckSpWp]: Trace formula consists of 339 conjuncts, 99 conjunts are in the unsatisfiable core [2020-07-21 16:59:06,553 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:59:15,519 INFO L134 CoverageAnalysis]: Checked inductivity of 4873 backedges. 292 proven. 4560 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-21 16:59:15,520 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:59:38,890 INFO L134 CoverageAnalysis]: Checked inductivity of 4873 backedges. 292 proven. 4560 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-21 16:59:38,891 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1087436824] [2020-07-21 16:59:38,891 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:59:38,892 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [99, 99] total 196 [2020-07-21 16:59:38,892 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [60524215] [2020-07-21 16:59:38,893 INFO L459 AbstractCegarLoop]: Interpolant automaton has 196 states [2020-07-21 16:59:38,893 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:59:38,894 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 196 interpolants. [2020-07-21 16:59:38,897 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7220, Invalid=31000, Unknown=0, NotChecked=0, Total=38220 [2020-07-21 16:59:38,897 INFO L87 Difference]: Start difference. First operand 122 states and 130 transitions. Second operand 196 states. [2020-07-21 16:59:39,369 WARN L193 SmtUtils]: Spent 385.00 ms on a formula simplification. DAG size of input: 290 DAG size of output: 10 [2020-07-21 16:59:39,874 WARN L193 SmtUtils]: Spent 393.00 ms on a formula simplification. DAG size of input: 289 DAG size of output: 12 [2020-07-21 16:59:40,290 WARN L193 SmtUtils]: Spent 369.00 ms on a formula simplification. DAG size of input: 287 DAG size of output: 11 [2020-07-21 16:59:40,742 WARN L193 SmtUtils]: Spent 386.00 ms on a formula simplification. DAG size of input: 286 DAG size of output: 13 [2020-07-21 16:59:41,189 WARN L193 SmtUtils]: Spent 379.00 ms on a formula simplification. DAG size of input: 283 DAG size of output: 13 [2020-07-21 16:59:41,652 WARN L193 SmtUtils]: Spent 384.00 ms on a formula simplification. DAG size of input: 280 DAG size of output: 13 [2020-07-21 16:59:42,107 WARN L193 SmtUtils]: Spent 366.00 ms on a formula simplification. DAG size of input: 277 DAG size of output: 13 [2020-07-21 16:59:42,562 WARN L193 SmtUtils]: Spent 354.00 ms on a formula simplification. DAG size of input: 274 DAG size of output: 13 [2020-07-21 16:59:43,015 WARN L193 SmtUtils]: Spent 344.00 ms on a formula simplification. DAG size of input: 271 DAG size of output: 13 [2020-07-21 16:59:43,477 WARN L193 SmtUtils]: Spent 347.00 ms on a formula simplification. DAG size of input: 268 DAG size of output: 13 [2020-07-21 16:59:43,920 WARN L193 SmtUtils]: Spent 319.00 ms on a formula simplification. DAG size of input: 265 DAG size of output: 13 [2020-07-21 16:59:44,372 WARN L193 SmtUtils]: Spent 321.00 ms on a formula simplification. DAG size of input: 262 DAG size of output: 13 [2020-07-21 16:59:44,843 WARN L193 SmtUtils]: Spent 328.00 ms on a formula simplification. DAG size of input: 259 DAG size of output: 13 [2020-07-21 16:59:45,341 WARN L193 SmtUtils]: Spent 344.00 ms on a formula simplification. DAG size of input: 256 DAG size of output: 13 [2020-07-21 16:59:45,820 WARN L193 SmtUtils]: Spent 317.00 ms on a formula simplification. DAG size of input: 253 DAG size of output: 13 [2020-07-21 16:59:46,299 WARN L193 SmtUtils]: Spent 323.00 ms on a formula simplification. DAG size of input: 250 DAG size of output: 13 [2020-07-21 16:59:46,816 WARN L193 SmtUtils]: Spent 322.00 ms on a formula simplification. DAG size of input: 247 DAG size of output: 13 [2020-07-21 16:59:47,317 WARN L193 SmtUtils]: Spent 311.00 ms on a formula simplification. DAG size of input: 244 DAG size of output: 13 [2020-07-21 16:59:47,800 WARN L193 SmtUtils]: Spent 294.00 ms on a formula simplification. DAG size of input: 241 DAG size of output: 13 [2020-07-21 16:59:48,271 WARN L193 SmtUtils]: Spent 283.00 ms on a formula simplification. DAG size of input: 238 DAG size of output: 13 [2020-07-21 16:59:48,776 WARN L193 SmtUtils]: Spent 296.00 ms on a formula simplification. DAG size of input: 235 DAG size of output: 13 [2020-07-21 16:59:49,270 WARN L193 SmtUtils]: Spent 281.00 ms on a formula simplification. DAG size of input: 232 DAG size of output: 13 [2020-07-21 16:59:49,765 WARN L193 SmtUtils]: Spent 286.00 ms on a formula simplification. DAG size of input: 229 DAG size of output: 13 [2020-07-21 16:59:50,251 WARN L193 SmtUtils]: Spent 256.00 ms on a formula simplification. DAG size of input: 226 DAG size of output: 13 [2020-07-21 16:59:50,769 WARN L193 SmtUtils]: Spent 275.00 ms on a formula simplification. DAG size of input: 223 DAG size of output: 13 [2020-07-21 16:59:51,274 WARN L193 SmtUtils]: Spent 250.00 ms on a formula simplification. DAG size of input: 220 DAG size of output: 13 [2020-07-21 16:59:51,788 WARN L193 SmtUtils]: Spent 253.00 ms on a formula simplification. DAG size of input: 217 DAG size of output: 13 [2020-07-21 16:59:52,328 WARN L193 SmtUtils]: Spent 260.00 ms on a formula simplification. DAG size of input: 214 DAG size of output: 13 [2020-07-21 16:59:52,844 WARN L193 SmtUtils]: Spent 243.00 ms on a formula simplification. DAG size of input: 211 DAG size of output: 13 [2020-07-21 16:59:53,344 WARN L193 SmtUtils]: Spent 235.00 ms on a formula simplification. DAG size of input: 208 DAG size of output: 13 [2020-07-21 16:59:53,859 WARN L193 SmtUtils]: Spent 246.00 ms on a formula simplification. DAG size of input: 205 DAG size of output: 13 [2020-07-21 16:59:54,441 WARN L193 SmtUtils]: Spent 247.00 ms on a formula simplification. DAG size of input: 202 DAG size of output: 13 [2020-07-21 16:59:55,039 WARN L193 SmtUtils]: Spent 270.00 ms on a formula simplification. DAG size of input: 199 DAG size of output: 13 [2020-07-21 16:59:55,638 WARN L193 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 196 DAG size of output: 13 [2020-07-21 16:59:56,234 WARN L193 SmtUtils]: Spent 232.00 ms on a formula simplification. DAG size of input: 193 DAG size of output: 13 [2020-07-21 16:59:56,795 WARN L193 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 190 DAG size of output: 13 [2020-07-21 16:59:57,395 WARN L193 SmtUtils]: Spent 222.00 ms on a formula simplification. DAG size of input: 187 DAG size of output: 13 [2020-07-21 16:59:58,002 WARN L193 SmtUtils]: Spent 213.00 ms on a formula simplification. DAG size of input: 184 DAG size of output: 13 [2020-07-21 16:59:58,618 WARN L193 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 181 DAG size of output: 13 [2020-07-21 16:59:59,209 WARN L193 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 178 DAG size of output: 13 [2020-07-21 16:59:59,808 WARN L193 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 175 DAG size of output: 13 [2020-07-21 17:00:00,427 WARN L193 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 172 DAG size of output: 13 [2020-07-21 17:00:01,031 WARN L193 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 169 DAG size of output: 13 [2020-07-21 17:00:01,630 WARN L193 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 166 DAG size of output: 13 [2020-07-21 17:00:02,236 WARN L193 SmtUtils]: Spent 192.00 ms on a formula simplification. DAG size of input: 163 DAG size of output: 13 [2020-07-21 17:00:02,823 WARN L193 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 160 DAG size of output: 13 [2020-07-21 17:00:03,390 WARN L193 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 157 DAG size of output: 13 [2020-07-21 17:00:03,969 WARN L193 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 154 DAG size of output: 13 [2020-07-21 17:00:04,585 WARN L193 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 151 DAG size of output: 13 [2020-07-21 17:00:05,212 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 148 DAG size of output: 13 [2020-07-21 17:00:05,800 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 145 DAG size of output: 13 [2020-07-21 17:00:06,400 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 142 DAG size of output: 13 [2020-07-21 17:00:07,021 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 139 DAG size of output: 13 [2020-07-21 17:00:07,694 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 136 DAG size of output: 13 [2020-07-21 17:00:08,295 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 133 DAG size of output: 13 [2020-07-21 17:00:08,899 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 130 DAG size of output: 13 [2020-07-21 17:00:09,479 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 127 DAG size of output: 13 [2020-07-21 17:00:10,099 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 124 DAG size of output: 13 [2020-07-21 17:00:10,743 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 121 DAG size of output: 13 [2020-07-21 17:00:11,351 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 118 DAG size of output: 13 [2020-07-21 17:00:11,946 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 115 DAG size of output: 13 [2020-07-21 17:00:12,569 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 112 DAG size of output: 13 [2020-07-21 17:00:13,198 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 109 DAG size of output: 13 [2020-07-21 17:00:13,842 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 106 DAG size of output: 13 [2020-07-21 17:00:14,677 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 103 DAG size of output: 13 [2020-07-21 17:00:15,392 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 100 DAG size of output: 13 [2020-07-21 17:00:16,085 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 97 DAG size of output: 13 [2020-07-21 17:00:35,307 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 105 DAG size of output: 16 [2020-07-21 17:00:51,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:00:51,441 INFO L93 Difference]: Finished difference Result 167 states and 207 transitions. [2020-07-21 17:00:51,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 123 states. [2020-07-21 17:00:51,444 INFO L78 Accepts]: Start accepts. Automaton has 196 states. Word has length 121 [2020-07-21 17:00:51,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:00:51,447 INFO L225 Difference]: With dead ends: 167 [2020-07-21 17:00:51,447 INFO L226 Difference]: Without dead ends: 147 [2020-07-21 17:00:51,451 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 360 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 313 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13915 ImplicationChecksByTransitivity, 103.5s TimeCoverageRelationStatistics Valid=28564, Invalid=70346, Unknown=0, NotChecked=0, Total=98910 [2020-07-21 17:00:51,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2020-07-21 17:00:51,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 147. [2020-07-21 17:00:51,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2020-07-21 17:00:51,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 155 transitions. [2020-07-21 17:00:51,469 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 155 transitions. Word has length 121 [2020-07-21 17:00:51,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:00:51,470 INFO L479 AbstractCegarLoop]: Abstraction has 147 states and 155 transitions. [2020-07-21 17:00:51,470 INFO L480 AbstractCegarLoop]: Interpolant automaton has 196 states. [2020-07-21 17:00:51,470 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 155 transitions. [2020-07-21 17:00:51,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2020-07-21 17:00:51,473 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:00:51,473 INFO L422 BasicCegarLoop]: trace histogram [120, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:00:51,687 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:00:51,688 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:00:51,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:00:51,689 INFO L82 PathProgramCache]: Analyzing trace with hash -1451426972, now seen corresponding path program 9 times [2020-07-21 17:00:51,689 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:00:51,690 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [560037874] [2020-07-21 17:00:51,690 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:00:51,776 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:00:51,776 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:00:51,786 INFO L263 TraceCheckSpWp]: Trace formula consists of 414 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 17:00:51,791 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:00:51,975 INFO L134 CoverageAnalysis]: Checked inductivity of 7648 backedges. 0 proven. 745 refuted. 0 times theorem prover too weak. 6903 trivial. 0 not checked. [2020-07-21 17:00:51,975 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 17:00:52,300 INFO L134 CoverageAnalysis]: Checked inductivity of 7648 backedges. 237 proven. 508 refuted. 0 times theorem prover too weak. 6903 trivial. 0 not checked. [2020-07-21 17:00:52,300 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [560037874] [2020-07-21 17:00:52,300 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 17:00:52,301 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 16 [2020-07-21 17:00:52,301 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [771544121] [2020-07-21 17:00:52,301 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 17:00:52,301 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:00:52,301 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 17:00:52,302 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=168, Unknown=0, NotChecked=0, Total=240 [2020-07-21 17:00:52,302 INFO L87 Difference]: Start difference. First operand 147 states and 155 transitions. Second operand 16 states. [2020-07-21 17:00:54,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:00:54,485 INFO L93 Difference]: Finished difference Result 239 states and 310 transitions. [2020-07-21 17:00:54,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-07-21 17:00:54,489 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 146 [2020-07-21 17:00:54,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:00:54,494 INFO L225 Difference]: With dead ends: 239 [2020-07-21 17:00:54,495 INFO L226 Difference]: Without dead ends: 234 [2020-07-21 17:00:54,495 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 326 GetRequests, 276 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 713 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=724, Invalid=1826, Unknown=0, NotChecked=0, Total=2550 [2020-07-21 17:00:54,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 234 states. [2020-07-21 17:00:54,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 234 to 193. [2020-07-21 17:00:54,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 193 states. [2020-07-21 17:00:54,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 233 transitions. [2020-07-21 17:00:54,520 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 233 transitions. Word has length 146 [2020-07-21 17:00:54,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:00:54,521 INFO L479 AbstractCegarLoop]: Abstraction has 193 states and 233 transitions. [2020-07-21 17:00:54,521 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 17:00:54,521 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 233 transitions. [2020-07-21 17:00:54,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2020-07-21 17:00:54,523 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:00:54,524 INFO L422 BasicCegarLoop]: trace histogram [120, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:00:54,734 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:00:54,735 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:00:54,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:00:54,736 INFO L82 PathProgramCache]: Analyzing trace with hash 334948414, now seen corresponding path program 10 times [2020-07-21 17:00:54,736 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:00:54,736 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [549428502] [2020-07-21 17:00:54,737 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:00:54,825 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:00:54,826 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:00:54,835 INFO L263 TraceCheckSpWp]: Trace formula consists of 449 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 17:00:54,840 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:00:55,248 INFO L134 CoverageAnalysis]: Checked inductivity of 8373 backedges. 0 proven. 1470 refuted. 0 times theorem prover too weak. 6903 trivial. 0 not checked. [2020-07-21 17:00:55,248 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 17:00:56,137 INFO L134 CoverageAnalysis]: Checked inductivity of 8373 backedges. 237 proven. 1233 refuted. 0 times theorem prover too weak. 6903 trivial. 0 not checked. [2020-07-21 17:00:56,138 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [549428502] [2020-07-21 17:00:56,138 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 17:00:56,138 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 26 [2020-07-21 17:00:56,139 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [544702318] [2020-07-21 17:00:56,139 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-21 17:00:56,139 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:00:56,140 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-21 17:00:56,140 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=227, Invalid=423, Unknown=0, NotChecked=0, Total=650 [2020-07-21 17:00:56,140 INFO L87 Difference]: Start difference. First operand 193 states and 233 transitions. Second operand 26 states. [2020-07-21 17:01:01,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:01:01,810 INFO L93 Difference]: Finished difference Result 431 states and 626 transitions. [2020-07-21 17:01:01,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2020-07-21 17:01:01,813 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 166 [2020-07-21 17:01:01,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:01:01,817 INFO L225 Difference]: With dead ends: 431 [2020-07-21 17:01:01,817 INFO L226 Difference]: Without dead ends: 426 [2020-07-21 17:01:01,818 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 406 GetRequests, 306 SyntacticMatches, 1 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3438 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=2784, Invalid=7316, Unknown=0, NotChecked=0, Total=10100 [2020-07-21 17:01:01,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 426 states. [2020-07-21 17:01:01,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 426 to 248. [2020-07-21 17:01:01,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 248 states. [2020-07-21 17:01:01,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 323 transitions. [2020-07-21 17:01:01,848 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 323 transitions. Word has length 166 [2020-07-21 17:01:01,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:01:01,849 INFO L479 AbstractCegarLoop]: Abstraction has 248 states and 323 transitions. [2020-07-21 17:01:01,849 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-21 17:01:01,849 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 323 transitions. [2020-07-21 17:01:01,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2020-07-21 17:01:01,861 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:01:01,861 INFO L422 BasicCegarLoop]: trace histogram [120, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:01:02,069 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:01:02,070 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:01:02,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:01:02,071 INFO L82 PathProgramCache]: Analyzing trace with hash 1778806514, now seen corresponding path program 11 times [2020-07-21 17:01:02,071 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:01:02,073 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [257758676] [2020-07-21 17:01:02,073 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:01:02,182 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:01:02,182 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:01:02,192 INFO L263 TraceCheckSpWp]: Trace formula consists of 519 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-21 17:01:02,196 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:01:03,142 INFO L134 CoverageAnalysis]: Checked inductivity of 10123 backedges. 0 proven. 3220 refuted. 0 times theorem prover too weak. 6903 trivial. 0 not checked. [2020-07-21 17:01:03,142 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 17:01:05,433 INFO L134 CoverageAnalysis]: Checked inductivity of 10123 backedges. 237 proven. 2983 refuted. 0 times theorem prover too weak. 6903 trivial. 0 not checked. [2020-07-21 17:01:05,434 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [257758676] [2020-07-21 17:01:05,434 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 17:01:05,434 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 46 [2020-07-21 17:01:05,434 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [361891022] [2020-07-21 17:01:05,435 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-07-21 17:01:05,435 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:01:05,436 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-07-21 17:01:05,436 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=837, Invalid=1233, Unknown=0, NotChecked=0, Total=2070 [2020-07-21 17:01:05,436 INFO L87 Difference]: Start difference. First operand 248 states and 323 transitions. Second operand 46 states. [2020-07-21 17:01:22,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:01:22,838 INFO L93 Difference]: Finished difference Result 971 states and 1506 transitions. [2020-07-21 17:01:22,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 161 states. [2020-07-21 17:01:22,841 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 206 [2020-07-21 17:01:22,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:01:22,848 INFO L225 Difference]: With dead ends: 971 [2020-07-21 17:01:22,848 INFO L226 Difference]: Without dead ends: 966 [2020-07-21 17:01:22,851 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 566 GetRequests, 366 SyntacticMatches, 1 SemanticMatches, 199 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14963 ImplicationChecksByTransitivity, 18.6s TimeCoverageRelationStatistics Valid=10954, Invalid=29246, Unknown=0, NotChecked=0, Total=40200 [2020-07-21 17:01:22,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 966 states. [2020-07-21 17:01:22,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 966 to 358. [2020-07-21 17:01:22,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 358 states. [2020-07-21 17:01:22,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 358 states to 358 states and 503 transitions. [2020-07-21 17:01:22,894 INFO L78 Accepts]: Start accepts. Automaton has 358 states and 503 transitions. Word has length 206 [2020-07-21 17:01:22,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:01:22,894 INFO L479 AbstractCegarLoop]: Abstraction has 358 states and 503 transitions. [2020-07-21 17:01:22,894 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-07-21 17:01:22,895 INFO L276 IsEmpty]: Start isEmpty. Operand 358 states and 503 transitions. [2020-07-21 17:01:22,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-21 17:01:22,899 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:01:22,899 INFO L422 BasicCegarLoop]: trace histogram [120, 39, 39, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:01:23,113 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:01:23,114 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:01:23,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:01:23,115 INFO L82 PathProgramCache]: Analyzing trace with hash -1264963494, now seen corresponding path program 12 times [2020-07-21 17:01:23,115 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:01:23,116 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [788777740] [2020-07-21 17:01:23,116 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:01:23,218 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:01:23,219 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:01:23,221 INFO L263 TraceCheckSpWp]: Trace formula consists of 659 conjuncts, 41 conjunts are in the unsatisfiable core [2020-07-21 17:01:23,226 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:01:26,077 INFO L134 CoverageAnalysis]: Checked inductivity of 14823 backedges. 0 proven. 7563 refuted. 0 times theorem prover too weak. 7260 trivial. 0 not checked. [2020-07-21 17:01:26,077 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 17:01:34,090 INFO L134 CoverageAnalysis]: Checked inductivity of 14823 backedges. 0 proven. 7563 refuted. 0 times theorem prover too weak. 7260 trivial. 0 not checked. [2020-07-21 17:01:34,090 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [788777740] [2020-07-21 17:01:34,090 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 17:01:34,091 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42] total 82 [2020-07-21 17:01:34,091 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [800148089] [2020-07-21 17:01:34,091 INFO L459 AbstractCegarLoop]: Interpolant automaton has 82 states [2020-07-21 17:01:34,092 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:01:34,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2020-07-21 17:01:34,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3321, Invalid=3321, Unknown=0, NotChecked=0, Total=6642 [2020-07-21 17:01:34,092 INFO L87 Difference]: Start difference. First operand 358 states and 503 transitions. Second operand 82 states. [2020-07-21 17:01:36,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:01:36,542 INFO L93 Difference]: Finished difference Result 13936 states and 22813 transitions. [2020-07-21 17:01:36,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2020-07-21 17:01:36,546 INFO L78 Accepts]: Start accepts. Automaton has 82 states. Word has length 286 [2020-07-21 17:01:36,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:01:36,608 INFO L225 Difference]: With dead ends: 13936 [2020-07-21 17:01:36,609 INFO L226 Difference]: Without dead ends: 13931 [2020-07-21 17:01:36,614 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 571 GetRequests, 491 SyntacticMatches, 0 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 10.6s TimeCoverageRelationStatistics Valid=3321, Invalid=3321, Unknown=0, NotChecked=0, Total=6642 [2020-07-21 17:01:36,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13931 states. [2020-07-21 17:01:37,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13931 to 9493. [2020-07-21 17:01:37,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9493 states. [2020-07-21 17:01:37,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9493 states to 9493 states and 15413 transitions. [2020-07-21 17:01:37,865 INFO L78 Accepts]: Start accepts. Automaton has 9493 states and 15413 transitions. Word has length 286 [2020-07-21 17:01:37,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:01:37,865 INFO L479 AbstractCegarLoop]: Abstraction has 9493 states and 15413 transitions. [2020-07-21 17:01:37,865 INFO L480 AbstractCegarLoop]: Interpolant automaton has 82 states. [2020-07-21 17:01:37,866 INFO L276 IsEmpty]: Start isEmpty. Operand 9493 states and 15413 transitions. [2020-07-21 17:01:37,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2020-07-21 17:01:37,894 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:01:37,895 INFO L422 BasicCegarLoop]: trace histogram [120, 80, 80, 80, 80, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:01:38,107 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:01:38,108 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:01:38,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:01:38,109 INFO L82 PathProgramCache]: Analyzing trace with hash -1933589316, now seen corresponding path program 13 times [2020-07-21 17:01:38,109 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:01:38,110 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1560599265] [2020-07-21 17:01:38,110 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:01:38,265 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:01:38,266 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:01:38,278 INFO L263 TraceCheckSpWp]: Trace formula consists of 946 conjuncts, 88 conjunts are in the unsatisfiable core [2020-07-21 17:01:38,285 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:01:52,788 INFO L134 CoverageAnalysis]: Checked inductivity of 29460 backedges. 0 proven. 23019 refuted. 0 times theorem prover too weak. 6441 trivial. 0 not checked. [2020-07-21 17:01:52,789 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 17:02:09,666 INFO L134 CoverageAnalysis]: Checked inductivity of 29460 backedges. 699 proven. 22320 refuted. 0 times theorem prover too weak. 6441 trivial. 0 not checked. [2020-07-21 17:02:09,666 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1560599265] [2020-07-21 17:02:09,667 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 17:02:09,667 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [89, 89] total 98 [2020-07-21 17:02:09,667 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553020909] [2020-07-21 17:02:09,668 INFO L459 AbstractCegarLoop]: Interpolant automaton has 98 states [2020-07-21 17:02:09,669 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:02:09,670 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2020-07-21 17:02:09,670 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3569, Invalid=5937, Unknown=0, NotChecked=0, Total=9506 [2020-07-21 17:02:09,670 INFO L87 Difference]: Start difference. First operand 9493 states and 15413 transitions. Second operand 98 states. [2020-07-21 17:02:57,923 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 22 [2020-07-21 17:03:11,774 WARN L193 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 22 [2020-07-21 17:03:15,418 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 22 [2020-07-21 17:03:19,466 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 22 [2020-07-21 17:03:23,603 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 22 [2020-07-21 17:03:36,504 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 17:03:40,867 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 22 [2020-07-21 17:03:42,084 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 17:03:46,366 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 17:03:53,877 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 17:03:57,993 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 17:04:02,233 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 17:04:10,358 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 17:04:16,178 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 17:04:20,765 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 17:04:29,441 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 17:04:34,163 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 17:04:38,767 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 17:04:47,828 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 17:04:52,739 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 17:04:57,536 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 17:05:02,392 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 17:05:06,975 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 17:05:11,817 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 17:05:18,515 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 17:05:23,123 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 17:05:27,903 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 17:05:33,177 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 17:05:38,322 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 17:05:43,278 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 17:05:48,207 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 17:05:53,678 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 17:05:59,063 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 17:06:04,431 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 17:06:09,570 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 17:06:15,359 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 17:06:21,020 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 17:06:26,591 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 17:06:32,011 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 17:06:37,864 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 17:06:44,036 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 17:06:52,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:06:52,955 INFO L93 Difference]: Finished difference Result 279630 states and 452957 transitions. [2020-07-21 17:06:52,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 642 states. [2020-07-21 17:06:52,961 INFO L78 Accepts]: Start accepts. Automaton has 98 states. Word has length 450 [2020-07-21 17:06:52,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:06:53,811 INFO L225 Difference]: With dead ends: 279630 [2020-07-21 17:06:53,812 INFO L226 Difference]: Without dead ends: 279625 [2020-07-21 17:06:53,950 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1535 GetRequests, 724 SyntacticMatches, 79 SemanticMatches, 732 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 233488 ImplicationChecksByTransitivity, 273.9s TimeCoverageRelationStatistics Valid=103871, Invalid=434151, Unknown=0, NotChecked=0, Total=538022 [2020-07-21 17:06:54,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 279625 states. [2020-07-21 17:07:00,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 279625 to 13399. [2020-07-21 17:07:00,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13399 states. [2020-07-21 17:07:00,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13399 states to 13399 states and 21701 transitions. [2020-07-21 17:07:00,622 INFO L78 Accepts]: Start accepts. Automaton has 13399 states and 21701 transitions. Word has length 450 [2020-07-21 17:07:00,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:07:00,623 INFO L479 AbstractCegarLoop]: Abstraction has 13399 states and 21701 transitions. [2020-07-21 17:07:00,623 INFO L480 AbstractCegarLoop]: Interpolant automaton has 98 states. [2020-07-21 17:07:00,623 INFO L276 IsEmpty]: Start isEmpty. Operand 13399 states and 21701 transitions. [2020-07-21 17:07:00,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 463 [2020-07-21 17:07:00,659 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:07:00,659 INFO L422 BasicCegarLoop]: trace histogram [120, 83, 83, 83, 83, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:07:00,874 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:07:00,875 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:07:00,876 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:07:00,876 INFO L82 PathProgramCache]: Analyzing trace with hash 1934160754, now seen corresponding path program 14 times [2020-07-21 17:07:00,877 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:07:00,877 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1520951331] [2020-07-21 17:07:00,877 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:07:01,049 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:07:01,049 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:07:01,060 INFO L263 TraceCheckSpWp]: Trace formula consists of 967 conjuncts, 92 conjunts are in the unsatisfiable core [2020-07-21 17:07:01,067 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:07:22,879 INFO L134 CoverageAnalysis]: Checked inductivity of 30795 backedges. 0 proven. 24467 refuted. 0 times theorem prover too weak. 6328 trivial. 0 not checked. [2020-07-21 17:07:22,880 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 17:07:47,807 INFO L134 CoverageAnalysis]: Checked inductivity of 30795 backedges. 812 proven. 23655 refuted. 0 times theorem prover too weak. 6328 trivial. 0 not checked. [2020-07-21 17:07:47,808 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1520951331] [2020-07-21 17:07:47,808 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 17:07:47,809 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [93, 93] total 102 [2020-07-21 17:07:47,809 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1527702469] [2020-07-21 17:07:47,810 INFO L459 AbstractCegarLoop]: Interpolant automaton has 102 states [2020-07-21 17:07:47,810 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:07:47,811 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 102 interpolants. [2020-07-21 17:07:47,811 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3751, Invalid=6551, Unknown=0, NotChecked=0, Total=10302 [2020-07-21 17:07:47,811 INFO L87 Difference]: Start difference. First operand 13399 states and 21701 transitions. Second operand 102 states. [2020-07-21 17:07:49,483 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 17 [2020-07-21 17:07:50,302 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 16 [2020-07-21 17:07:50,996 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 17 [2020-07-21 17:07:51,633 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 17 [2020-07-21 17:07:52,480 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 17 [2020-07-21 17:07:53,386 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 17 [2020-07-21 17:07:53,981 WARN L193 SmtUtils]: Spent 248.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-21 17:07:54,515 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 17 [2020-07-21 17:07:55,354 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 17 [2020-07-21 17:07:56,491 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 17 [2020-07-21 17:07:57,646 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 17 [2020-07-21 17:07:58,818 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 17 [2020-07-21 17:08:00,201 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 17 [2020-07-21 17:08:01,676 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 17:08:03,272 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 17:08:05,191 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 17:08:05,836 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 17 [2020-07-21 17:08:07,785 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 17:08:08,472 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 17 [2020-07-21 17:08:11,401 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 17:08:12,091 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 17 [2020-07-21 17:08:15,317 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 17:08:16,045 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 17 [2020-07-21 17:08:19,064 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 17:08:19,716 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 17 [2020-07-21 17:08:22,748 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 17:08:23,518 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 17 [2020-07-21 17:08:27,069 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 17:08:27,846 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 17 [2020-07-21 17:08:31,723 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 17:08:32,533 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 17 [2020-07-21 17:08:36,108 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 17:08:39,714 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 17:08:40,395 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 17:08:43,283 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 17:08:44,475 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 17:08:46,438 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 17 [2020-07-21 17:08:48,766 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 17:08:49,911 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 17:08:54,810 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 17:08:56,022 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 17:09:00,206 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 17:09:01,463 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 17:09:05,806 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 17:09:06,964 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 17:09:11,320 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 17:09:12,657 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 17:09:17,595 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 17:09:18,993 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 17:09:23,874 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 17:09:25,337 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 17:09:30,104 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 17:09:31,607 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 17:09:36,794 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 17:09:38,629 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 17:09:44,020 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 17:09:45,623 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 17:09:51,140 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 17:09:52,642 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 17:09:58,346 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 17:10:00,307 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 17:10:06,422 WARN L193 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 17:10:08,206 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 17:10:14,297 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 17:10:15,999 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 17:10:24,076 WARN L193 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 17:10:25,895 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 17:10:32,268 WARN L193 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 17:10:34,079 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 17:10:40,190 WARN L193 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 17:10:42,071 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 17:10:53,331 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 17:10:58,809 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 17:11:07,179 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 17:11:08,151 WARN L193 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 17 [2020-07-21 17:11:15,581 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 17:11:23,812 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 17:11:32,479 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 17:11:40,524 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 17:11:49,088 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 17:11:57,727 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 17:12:05,845 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17