/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_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-invgen/nested6.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 14:30:18,003 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 14:30:18,006 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 14:30:18,024 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 14:30:18,025 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 14:30:18,027 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 14:30:18,029 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 14:30:18,036 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 14:30:18,038 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 14:30:18,042 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 14:30:18,043 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 14:30:18,044 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 14:30:18,044 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 14:30:18,045 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 14:30:18,046 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 14:30:18,047 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 14:30:18,048 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 14:30:18,049 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 14:30:18,050 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 14:30:18,052 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 14:30:18,054 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 14:30:18,055 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 14:30:18,056 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 14:30:18,057 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 14:30:18,059 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 14:30:18,066 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 14:30:18,067 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 14:30:18,068 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 14:30:18,069 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 14:30:18,083 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 14:30:18,083 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 14:30:18,084 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 14:30:18,085 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 14:30:18,085 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 14:30:18,085 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 14:30:18,085 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 14:30:18,085 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 14:30:18,086 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 14:30:18,086 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 14:30:18,086 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 14:30:18,086 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 14:30:18,086 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 14:30:18,086 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 14:30:18,087 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 14:30:18,087 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 14:30:18,087 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 14:30:18,087 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 14:30:18,087 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 14:30:18,088 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 14:30:18,088 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 14:30:18,088 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 14:30:18,088 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 14:30:18,088 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 14:30:18,089 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 14:30:18,089 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 14:30:18,089 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:18,089 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 14:30:18,090 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 14:30:18,090 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_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 14:30:18,381 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 14:30:18,401 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 14:30:18,404 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 14:30:18,406 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 14:30:18,406 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 14:30:18,407 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/nested6.i [2020-07-20 14:30:18,490 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5ed859091/9bb9a3574e1141519f61e4fe05b0cba0/FLAGa38858be9 [2020-07-20 14:30:18,988 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 14:30:18,990 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/nested6.i [2020-07-20 14:30:18,997 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5ed859091/9bb9a3574e1141519f61e4fe05b0cba0/FLAGa38858be9 [2020-07-20 14:30:19,331 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5ed859091/9bb9a3574e1141519f61e4fe05b0cba0 [2020-07-20 14:30:19,339 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 14:30:19,341 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 14:30:19,343 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 14:30:19,343 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 14:30:19,346 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 14:30:19,347 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 02:30:19" (1/1) ... [2020-07-20 14:30:19,350 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5d336764 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:30:19, skipping insertion in model container [2020-07-20 14:30:19,351 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 02:30:19" (1/1) ... [2020-07-20 14:30:19,358 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 14:30:19,378 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 14:30:19,569 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 14:30:19,574 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 14:30:19,593 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 14:30:19,609 INFO L208 MainTranslator]: Completed translation [2020-07-20 14:30:19,609 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:30:19 WrapperNode [2020-07-20 14:30:19,609 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 14:30:19,610 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 14:30:19,610 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 14:30:19,611 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 14:30:19,622 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:30:19" (1/1) ... [2020-07-20 14:30:19,622 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:30:19" (1/1) ... [2020-07-20 14:30:19,627 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:30:19" (1/1) ... [2020-07-20 14:30:19,628 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:30:19" (1/1) ... [2020-07-20 14:30:19,632 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:30:19" (1/1) ... [2020-07-20 14:30:19,638 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:30:19" (1/1) ... [2020-07-20 14:30:19,639 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:30:19" (1/1) ... [2020-07-20 14:30:19,722 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 14:30:19,722 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 14:30:19,722 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 14:30:19,723 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 14:30:19,726 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:30:19" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 14:30:19,785 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 14:30:19,786 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 14:30:19,786 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 14:30:19,786 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 14:30:19,786 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 14:30:19,786 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 14:30:19,786 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 14:30:19,787 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 14:30:19,787 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 14:30:19,787 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 14:30:19,787 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 14:30:19,787 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 14:30:19,787 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 14:30:20,094 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 14:30:20,094 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-07-20 14:30:20,100 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 02:30:20 BoogieIcfgContainer [2020-07-20 14:30:20,101 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 14:30:20,108 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 14:30:20,109 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 14:30:20,111 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 14:30:20,111 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 02:30:19" (1/3) ... [2020-07-20 14:30:20,113 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6b1ed57f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 02:30:20, skipping insertion in model container [2020-07-20 14:30:20,113 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:30:19" (2/3) ... [2020-07-20 14:30:20,117 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6b1ed57f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 02:30:20, skipping insertion in model container [2020-07-20 14:30:20,118 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 02:30:20" (3/3) ... [2020-07-20 14:30:20,120 INFO L109 eAbstractionObserver]: Analyzing ICFG nested6.i [2020-07-20 14:30:20,133 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 14:30:20,143 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 14:30:20,157 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 14:30:20,186 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 14:30:20,186 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 14:30:20,186 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 14:30:20,186 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 14:30:20,186 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 14:30:20,186 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 14:30:20,187 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 14:30:20,187 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 14:30:20,210 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2020-07-20 14:30:20,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-20 14:30:20,215 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:20,216 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:20,216 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:20,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:20,221 INFO L82 PathProgramCache]: Analyzing trace with hash 404168940, now seen corresponding path program 1 times [2020-07-20 14:30:20,227 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:20,228 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2021794929] [2020-07-20 14:30:20,228 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:20,301 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:30:20,302 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:20,305 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 14:30:20,311 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:20,361 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:30:20,394 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:30:20,395 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 14:30:20,396 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2021794929] [2020-07-20 14:30:20,396 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 14:30:20,397 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 14:30:20,398 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1619306171] [2020-07-20 14:30:20,403 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 14:30:20,403 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:20,418 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 14:30:20,418 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 14:30:20,420 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 5 states. [2020-07-20 14:30:20,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:20,568 INFO L93 Difference]: Finished difference Result 57 states and 80 transitions. [2020-07-20 14:30:20,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 14:30:20,570 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2020-07-20 14:30:20,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:20,581 INFO L225 Difference]: With dead ends: 57 [2020-07-20 14:30:20,581 INFO L226 Difference]: Without dead ends: 28 [2020-07-20 14:30:20,585 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 14:30:20,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-20 14:30:20,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-07-20 14:30:20,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-20 14:30:20,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-07-20 14:30:20,631 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 15 [2020-07-20 14:30:20,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:20,632 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-07-20 14:30:20,632 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 14:30:20,633 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-07-20 14:30:20,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-20 14:30:20,634 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:20,635 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:20,840 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:20,840 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:20,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:20,841 INFO L82 PathProgramCache]: Analyzing trace with hash -849304486, now seen corresponding path program 1 times [2020-07-20 14:30:20,842 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:20,843 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [488418941] [2020-07-20 14:30:20,843 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:20,873 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:30:20,874 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:20,874 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 14:30:20,876 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:20,919 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:30:20,951 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:30:20,952 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 14:30:20,957 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [488418941] [2020-07-20 14:30:20,957 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 14:30:20,957 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-20 14:30:20,958 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2056277998] [2020-07-20 14:30:20,959 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 14:30:20,960 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:20,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 14:30:20,961 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-20 14:30:20,961 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 6 states. [2020-07-20 14:30:21,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:21,151 INFO L93 Difference]: Finished difference Result 40 states and 47 transitions. [2020-07-20 14:30:21,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 14:30:21,152 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-07-20 14:30:21,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:21,153 INFO L225 Difference]: With dead ends: 40 [2020-07-20 14:30:21,154 INFO L226 Difference]: Without dead ends: 38 [2020-07-20 14:30:21,155 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-07-20 14:30:21,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-20 14:30:21,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 32. [2020-07-20 14:30:21,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-07-20 14:30:21,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2020-07-20 14:30:21,165 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 16 [2020-07-20 14:30:21,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:21,166 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2020-07-20 14:30:21,166 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 14:30:21,166 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2020-07-20 14:30:21,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 14:30:21,167 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:21,167 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:21,381 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:21,383 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:21,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:21,385 INFO L82 PathProgramCache]: Analyzing trace with hash -1573212483, now seen corresponding path program 1 times [2020-07-20 14:30:21,385 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:21,386 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [314491127] [2020-07-20 14:30:21,386 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:21,419 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:30:21,419 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:21,420 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 14:30:21,422 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:21,439 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:30:21,460 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:30:21,460 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 14:30:21,461 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [314491127] [2020-07-20 14:30:21,461 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 14:30:21,461 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 14:30:21,462 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1334077050] [2020-07-20 14:30:21,462 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 14:30:21,462 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:21,463 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 14:30:21,463 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 14:30:21,463 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand 5 states. [2020-07-20 14:30:21,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:21,555 INFO L93 Difference]: Finished difference Result 45 states and 51 transitions. [2020-07-20 14:30:21,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 14:30:21,556 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2020-07-20 14:30:21,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:21,558 INFO L225 Difference]: With dead ends: 45 [2020-07-20 14:30:21,558 INFO L226 Difference]: Without dead ends: 43 [2020-07-20 14:30:21,559 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 14:30:21,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-20 14:30:21,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-07-20 14:30:21,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-07-20 14:30:21,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 49 transitions. [2020-07-20 14:30:21,570 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 49 transitions. Word has length 20 [2020-07-20 14:30:21,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:21,570 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 49 transitions. [2020-07-20 14:30:21,571 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 14:30:21,571 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 49 transitions. [2020-07-20 14:30:21,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-20 14:30:21,572 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:21,572 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:21,779 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:21,780 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:21,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:21,781 INFO L82 PathProgramCache]: Analyzing trace with hash -1604756500, now seen corresponding path program 1 times [2020-07-20 14:30:21,781 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:21,782 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [98592196] [2020-07-20 14:30:21,782 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:21,824 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 14:30:21,825 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:21,826 INFO L263 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 14:30:21,828 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:21,850 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 14:30:21,850 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 14:30:21,850 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [98592196] [2020-07-20 14:30:21,851 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 14:30:21,851 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 14:30:21,851 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1866137526] [2020-07-20 14:30:21,852 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 14:30:21,852 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:21,852 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 14:30:21,852 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 14:30:21,853 INFO L87 Difference]: Start difference. First operand 43 states and 49 transitions. Second operand 4 states. [2020-07-20 14:30:21,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:21,914 INFO L93 Difference]: Finished difference Result 68 states and 78 transitions. [2020-07-20 14:30:21,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 14:30:21,914 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 24 [2020-07-20 14:30:21,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:21,915 INFO L225 Difference]: With dead ends: 68 [2020-07-20 14:30:21,915 INFO L226 Difference]: Without dead ends: 44 [2020-07-20 14:30:21,916 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 14:30:21,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-07-20 14:30:21,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-07-20 14:30:21,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-07-20 14:30:21,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 50 transitions. [2020-07-20 14:30:21,926 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 50 transitions. Word has length 24 [2020-07-20 14:30:21,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:21,926 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 50 transitions. [2020-07-20 14:30:21,926 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 14:30:21,927 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 50 transitions. [2020-07-20 14:30:21,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-20 14:30:21,928 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:21,928 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:22,141 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:22,142 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:22,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:22,143 INFO L82 PathProgramCache]: Analyzing trace with hash -1598241856, now seen corresponding path program 1 times [2020-07-20 14:30:22,143 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:22,144 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1736044123] [2020-07-20 14:30:22,144 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:22,179 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 14:30:22,179 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:22,180 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 14:30:22,182 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:22,241 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 8 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 14:30:22,241 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:22,293 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 6 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 14:30:22,294 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1736044123] [2020-07-20 14:30:22,294 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:22,294 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2020-07-20 14:30:22,295 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1651007065] [2020-07-20 14:30:22,295 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 14:30:22,295 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:22,296 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 14:30:22,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 14:30:22,296 INFO L87 Difference]: Start difference. First operand 44 states and 50 transitions. Second operand 6 states. [2020-07-20 14:30:22,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:22,377 INFO L93 Difference]: Finished difference Result 79 states and 92 transitions. [2020-07-20 14:30:22,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 14:30:22,378 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 31 [2020-07-20 14:30:22,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:22,379 INFO L225 Difference]: With dead ends: 79 [2020-07-20 14:30:22,379 INFO L226 Difference]: Without dead ends: 54 [2020-07-20 14:30:22,380 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 54 SyntacticMatches, 3 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2020-07-20 14:30:22,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-07-20 14:30:22,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 49. [2020-07-20 14:30:22,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-07-20 14:30:22,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 57 transitions. [2020-07-20 14:30:22,390 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 57 transitions. Word has length 31 [2020-07-20 14:30:22,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:22,390 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 57 transitions. [2020-07-20 14:30:22,391 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 14:30:22,391 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 57 transitions. [2020-07-20 14:30:22,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-07-20 14:30:22,392 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:22,392 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:22,607 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:22,608 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:22,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:22,608 INFO L82 PathProgramCache]: Analyzing trace with hash 2099424040, now seen corresponding path program 1 times [2020-07-20 14:30:22,608 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:22,609 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [362994532] [2020-07-20 14:30:22,609 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:22,640 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 14:30:22,641 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:22,641 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 14:30:22,644 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:22,709 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 14:30:22,709 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:22,842 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 14:30:22,843 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [362994532] [2020-07-20 14:30:22,843 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:22,843 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 13 [2020-07-20 14:30:22,843 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1564358346] [2020-07-20 14:30:22,844 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 14:30:22,844 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:22,844 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 14:30:22,845 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2020-07-20 14:30:22,845 INFO L87 Difference]: Start difference. First operand 49 states and 57 transitions. Second operand 13 states. [2020-07-20 14:30:46,520 WARN L193 SmtUtils]: Spent 2.05 s on a formula simplification that was a NOOP. DAG size: 17 [2020-07-20 14:30:56,998 WARN L193 SmtUtils]: Spent 2.04 s on a formula simplification that was a NOOP. DAG size: 16 [2020-07-20 14:31:01,393 WARN L193 SmtUtils]: Spent 2.08 s on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-20 14:31:24,282 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-20 14:31:49,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:31:49,985 INFO L93 Difference]: Finished difference Result 183 states and 247 transitions. [2020-07-20 14:31:49,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-07-20 14:31:49,992 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 34 [2020-07-20 14:31:49,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:31:49,994 INFO L225 Difference]: With dead ends: 183 [2020-07-20 14:31:49,995 INFO L226 Difference]: Without dead ends: 113 [2020-07-20 14:31:49,996 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 361 ImplicationChecksByTransitivity, 44.9s TimeCoverageRelationStatistics Valid=344, Invalid=1050, Unknown=12, NotChecked=0, Total=1406 [2020-07-20 14:31:49,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2020-07-20 14:31:50,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 89. [2020-07-20 14:31:50,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-07-20 14:31:50,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 117 transitions. [2020-07-20 14:31:50,020 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 117 transitions. Word has length 34 [2020-07-20 14:31:50,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:31:50,020 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 117 transitions. [2020-07-20 14:31:50,020 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 14:31:50,020 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 117 transitions. [2020-07-20 14:31:50,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-07-20 14:31:50,022 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:31:50,022 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:31:50,231 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:50,233 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:31:50,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:31:50,234 INFO L82 PathProgramCache]: Analyzing trace with hash -1702845076, now seen corresponding path program 2 times [2020-07-20 14:31:50,234 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:31:50,234 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [346795576] [2020-07-20 14:31:50,235 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:50,267 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:31:50,267 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:31:50,268 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 14:31:50,273 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:31:50,357 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:31:50,415 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 14:31:50,415 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:31:50,466 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:31:50,631 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 14:31:50,631 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [346795576] [2020-07-20 14:31:50,632 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:31:50,632 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2020-07-20 14:31:50,632 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1476103925] [2020-07-20 14:31:50,633 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 14:31:50,633 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:31:50,633 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 14:31:50,633 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-07-20 14:31:50,634 INFO L87 Difference]: Start difference. First operand 89 states and 117 transitions. Second operand 8 states. [2020-07-20 14:31:51,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:31:51,515 INFO L93 Difference]: Finished difference Result 148 states and 204 transitions. [2020-07-20 14:31:51,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 14:31:51,522 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 38 [2020-07-20 14:31:51,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:31:51,525 INFO L225 Difference]: With dead ends: 148 [2020-07-20 14:31:51,525 INFO L226 Difference]: Without dead ends: 146 [2020-07-20 14:31:51,526 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 65 SyntacticMatches, 6 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=38, Invalid=94, Unknown=0, NotChecked=0, Total=132 [2020-07-20 14:31:51,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2020-07-20 14:31:51,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 120. [2020-07-20 14:31:51,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2020-07-20 14:31:51,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 163 transitions. [2020-07-20 14:31:51,554 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 163 transitions. Word has length 38 [2020-07-20 14:31:51,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:31:51,554 INFO L479 AbstractCegarLoop]: Abstraction has 120 states and 163 transitions. [2020-07-20 14:31:51,554 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 14:31:51,555 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 163 transitions. [2020-07-20 14:31:51,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-07-20 14:31:51,557 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:31:51,557 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:31:51,765 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:51,766 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:31:51,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:31:51,767 INFO L82 PathProgramCache]: Analyzing trace with hash 1662503488, now seen corresponding path program 3 times [2020-07-20 14:31:51,767 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:31:51,768 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1762278564] [2020-07-20 14:31:51,768 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:51,817 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:31:51,817 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:31:51,818 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 14:31:51,820 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:31:51,859 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:31:51,920 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2020-07-20 14:31:51,921 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 14:31:51,921 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1762278564] [2020-07-20 14:31:51,921 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 14:31:51,921 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-20 14:31:51,922 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [403819881] [2020-07-20 14:31:51,922 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 14:31:51,923 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:31:51,924 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 14:31:51,924 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-07-20 14:31:51,924 INFO L87 Difference]: Start difference. First operand 120 states and 163 transitions. Second operand 6 states. [2020-07-20 14:31:52,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:31:52,192 INFO L93 Difference]: Finished difference Result 120 states and 163 transitions. [2020-07-20 14:31:52,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 14:31:52,198 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 45 [2020-07-20 14:31:52,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:31:52,199 INFO L225 Difference]: With dead ends: 120 [2020-07-20 14:31:52,199 INFO L226 Difference]: Without dead ends: 0 [2020-07-20 14:31:52,201 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-07-20 14:31:52,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-20 14:31:52,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-20 14:31:52,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-20 14:31:52,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-20 14:31:52,202 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 45 [2020-07-20 14:31:52,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:31:52,202 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-20 14:31:52,203 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 14:31:52,203 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-20 14:31:52,203 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-20 14:31:52,418 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:52,422 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-20 14:31:53,041 WARN L193 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 11 [2020-07-20 14:31:53,196 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 12 [2020-07-20 14:31:53,390 WARN L193 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 15 [2020-07-20 14:31:53,532 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 12 [2020-07-20 14:31:53,897 WARN L193 SmtUtils]: Spent 361.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 13 [2020-07-20 14:31:54,415 WARN L193 SmtUtils]: Spent 514.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 25 [2020-07-20 14:31:54,421 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-20 14:31:54,421 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-20 14:31:54,421 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-20 14:31:54,421 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-20 14:31:54,421 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-20 14:31:54,422 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-20 14:31:54,422 INFO L268 CegarLoopResult]: For program point assume_abort_if_notENTRY(lines 3 5) no Hoare annotation was computed. [2020-07-20 14:31:54,422 INFO L268 CegarLoopResult]: For program point L4(line 4) no Hoare annotation was computed. [2020-07-20 14:31:54,422 INFO L268 CegarLoopResult]: For program point L4-2(lines 3 5) no Hoare annotation was computed. [2020-07-20 14:31:54,422 INFO L268 CegarLoopResult]: For program point assume_abort_if_notEXIT(lines 3 5) no Hoare annotation was computed. [2020-07-20 14:31:54,422 INFO L268 CegarLoopResult]: For program point L31(lines 23 33) no Hoare annotation was computed. [2020-07-20 14:31:54,423 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 13 37) no Hoare annotation was computed. [2020-07-20 14:31:54,423 INFO L264 CegarLoopResult]: At program point L23-2(lines 23 33) the Hoare annotation is: (let ((.cse2 (* 2 main_~i~0))) (let ((.cse0 (<= main_~n~0 main_~k~0)) (.cse1 (<= .cse2 main_~j~0))) (or (and (<= main_~k~0 main_~n~0) .cse0 .cse1) (and (forall ((main_~n~0 Int)) (or (< main_~k~0 main_~n~0) (< (div (* main_~n~0 (- 1)) (- 2)) (+ main_~i~0 2)))) (<= main_~k~0 main_~j~0) .cse0 .cse1) (and (<= main_~j~0 .cse2) .cse0 .cse1 (<= main_~n~0 main_~j~0))))) [2020-07-20 14:31:54,423 INFO L268 CegarLoopResult]: For program point L24(lines 24 32) no Hoare annotation was computed. [2020-07-20 14:31:54,423 INFO L264 CegarLoopResult]: At program point L25-2(lines 25 27) the Hoare annotation is: (let ((.cse0 (* 2 main_~i~0))) (and (< main_~j~0 main_~n~0) (<= .cse0 main_~k~0) (<= main_~k~0 main_~n~0) (<= .cse0 main_~j~0))) [2020-07-20 14:31:54,423 INFO L268 CegarLoopResult]: For program point L17(line 17) no Hoare annotation was computed. [2020-07-20 14:31:54,424 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 13 37) no Hoare annotation was computed. [2020-07-20 14:31:54,424 INFO L264 CegarLoopResult]: At program point L30(line 30) the Hoare annotation is: (and (< main_~j~0 main_~n~0) (<= main_~k~0 main_~n~0) (<= main_~n~0 main_~k~0) (<= (* 2 main_~i~0) main_~j~0)) [2020-07-20 14:31:54,424 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 13 37) the Hoare annotation is: true [2020-07-20 14:31:54,424 INFO L264 CegarLoopResult]: At program point L30-1(line 30) the Hoare annotation is: (and (< main_~j~0 main_~n~0) (<= main_~k~0 main_~n~0) (<= main_~n~0 main_~k~0) (<= (* 2 main_~i~0) main_~j~0)) [2020-07-20 14:31:54,424 INFO L264 CegarLoopResult]: At program point L26(line 26) the Hoare annotation is: (let ((.cse0 (* 2 main_~i~0))) (and (< main_~j~0 main_~n~0) (<= (+ main_~k~0 1) main_~n~0) (<= .cse0 main_~k~0) (<= .cse0 main_~j~0))) [2020-07-20 14:31:54,424 INFO L268 CegarLoopResult]: For program point L26-1(lines 25 27) no Hoare annotation was computed. [2020-07-20 14:31:54,424 INFO L268 CegarLoopResult]: For program point L22-2(lines 22 34) no Hoare annotation was computed. [2020-07-20 14:31:54,425 INFO L264 CegarLoopResult]: At program point L22-3(lines 22 34) the Hoare annotation is: (let ((.cse0 (<= main_~n~0 main_~k~0))) (or (and (<= main_~k~0 main_~n~0) .cse0) (and (< main_~n~0 (+ (* 2 main_~i~0) 1)) .cse0 (<= main_~n~0 main_~j~0)))) [2020-07-20 14:31:54,425 INFO L268 CegarLoopResult]: For program point L18(lines 18 21) no Hoare annotation was computed. [2020-07-20 14:31:54,425 INFO L268 CegarLoopResult]: For program point L18-1(lines 18 21) no Hoare annotation was computed. [2020-07-20 14:31:54,425 INFO L271 CegarLoopResult]: At program point L35(lines 13 37) the Hoare annotation is: true [2020-07-20 14:31:54,425 INFO L271 CegarLoopResult]: At program point __VERIFIER_assertENTRY(lines 6 11) the Hoare annotation is: true [2020-07-20 14:31:54,425 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertEXIT(lines 6 11) no Hoare annotation was computed. [2020-07-20 14:31:54,426 INFO L268 CegarLoopResult]: For program point L8(line 8) no Hoare annotation was computed. [2020-07-20 14:31:54,426 INFO L268 CegarLoopResult]: For program point L7(lines 7 9) no Hoare annotation was computed. [2020-07-20 14:31:54,426 INFO L268 CegarLoopResult]: For program point L7-2(lines 6 11) no Hoare annotation was computed. [2020-07-20 14:31:54,426 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 8) no Hoare annotation was computed. [2020-07-20 14:31:54,444 WARN L417 cessorBacktranslator]: Identifier is quantified, using identity as back-translation of IdentifierExpression[main_~n~0,QUANTIFIED] [2020-07-20 14:31:54,445 WARN L417 cessorBacktranslator]: Identifier is quantified, using identity as back-translation of IdentifierExpression[main_~n~0,QUANTIFIED] [2020-07-20 14:31:54,446 WARN L417 cessorBacktranslator]: Identifier is quantified, using identity as back-translation of IdentifierExpression[main_~n~0,QUANTIFIED] [2020-07-20 14:31:54,446 WARN L417 cessorBacktranslator]: Identifier is quantified, using identity as back-translation of IdentifierExpression[main_~n~0,QUANTIFIED] [2020-07-20 14:31:54,448 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 02:31:54 BoogieIcfgContainer [2020-07-20 14:31:54,448 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 14:31:54,450 INFO L168 Benchmark]: Toolchain (without parser) took 95109.97 ms. Allocated memory was 138.9 MB in the beginning and 245.9 MB in the end (delta: 107.0 MB). Free memory was 104.3 MB in the beginning and 136.0 MB in the end (delta: -31.7 MB). Peak memory consumption was 75.3 MB. Max. memory is 7.1 GB. [2020-07-20 14:31:54,451 INFO L168 Benchmark]: CDTParser took 0.55 ms. Allocated memory is still 138.9 MB. Free memory was 122.0 MB in the beginning and 121.8 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-20 14:31:54,451 INFO L168 Benchmark]: CACSL2BoogieTranslator took 267.39 ms. Allocated memory is still 138.9 MB. Free memory was 104.1 MB in the beginning and 94.1 MB in the end (delta: 10.0 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. [2020-07-20 14:31:54,452 INFO L168 Benchmark]: Boogie Preprocessor took 111.59 ms. Allocated memory was 138.9 MB in the beginning and 202.9 MB in the end (delta: 64.0 MB). Free memory was 94.1 MB in the beginning and 183.0 MB in the end (delta: -88.8 MB). Peak memory consumption was 15.2 MB. Max. memory is 7.1 GB. [2020-07-20 14:31:54,453 INFO L168 Benchmark]: RCFGBuilder took 378.33 ms. Allocated memory is still 202.9 MB. Free memory was 183.0 MB in the beginning and 167.3 MB in the end (delta: 15.7 MB). Peak memory consumption was 15.7 MB. Max. memory is 7.1 GB. [2020-07-20 14:31:54,454 INFO L168 Benchmark]: TraceAbstraction took 94340.10 ms. Allocated memory was 202.9 MB in the beginning and 245.9 MB in the end (delta: 43.0 MB). Free memory was 167.3 MB in the beginning and 136.0 MB in the end (delta: 31.3 MB). Peak memory consumption was 74.3 MB. Max. memory is 7.1 GB. [2020-07-20 14:31:54,458 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.55 ms. Allocated memory is still 138.9 MB. Free memory was 122.0 MB in the beginning and 121.8 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 267.39 ms. Allocated memory is still 138.9 MB. Free memory was 104.1 MB in the beginning and 94.1 MB in the end (delta: 10.0 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 111.59 ms. Allocated memory was 138.9 MB in the beginning and 202.9 MB in the end (delta: 64.0 MB). Free memory was 94.1 MB in the beginning and 183.0 MB in the end (delta: -88.8 MB). Peak memory consumption was 15.2 MB. Max. memory is 7.1 GB. * RCFGBuilder took 378.33 ms. Allocated memory is still 202.9 MB. Free memory was 183.0 MB in the beginning and 167.3 MB in the end (delta: 15.7 MB). Peak memory consumption was 15.7 MB. Max. memory is 7.1 GB. * TraceAbstraction took 94340.10 ms. Allocated memory was 202.9 MB in the beginning and 245.9 MB in the end (delta: 43.0 MB). Free memory was 167.3 MB in the beginning and 136.0 MB in the end (delta: 31.3 MB). Peak memory consumption was 74.3 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.boogie.preprocessor: - GenericResult: Unfinished Backtranslation Identifier is quantified, using identity as back-translation of IdentifierExpression[main_~n~0,QUANTIFIED] - GenericResult: Unfinished Backtranslation Identifier is quantified, using identity as back-translation of IdentifierExpression[main_~n~0,QUANTIFIED] - GenericResult: Unfinished Backtranslation Identifier is quantified, using identity as back-translation of IdentifierExpression[main_~n~0,QUANTIFIED] - GenericResult: Unfinished Backtranslation Identifier is quantified, using identity as back-translation of IdentifierExpression[main_~n~0,QUANTIFIED] * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 8]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 25]: Loop Invariant Derived loop invariant: ((j < n && 2 * i <= k) && k <= n) && 2 * i <= j - InvariantResult [Line: 13]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 22]: Loop Invariant Derived loop invariant: (k <= n && n <= k) || ((n < 2 * i + 1 && n <= k) && n <= j) - InvariantResult [Line: 23]: Loop Invariant [2020-07-20 14:31:54,467 WARN L417 cessorBacktranslator]: Identifier is quantified, using identity as back-translation of IdentifierExpression[main_~n~0,QUANTIFIED] [2020-07-20 14:31:54,468 WARN L417 cessorBacktranslator]: Identifier is quantified, using identity as back-translation of IdentifierExpression[main_~n~0,QUANTIFIED] [2020-07-20 14:31:54,468 WARN L417 cessorBacktranslator]: Identifier is quantified, using identity as back-translation of IdentifierExpression[main_~n~0,QUANTIFIED] [2020-07-20 14:31:54,469 WARN L417 cessorBacktranslator]: Identifier is quantified, using identity as back-translation of IdentifierExpression[main_~n~0,QUANTIFIED] Derived loop invariant: (((k <= n && n <= k) && 2 * i <= j) || ((((forall main_~n~0 : int :: k < main_~n~0 || main_~n~0 * -1 / -2 < i + 2) && k <= j) && n <= k) && 2 * i <= j)) || (((j <= 2 * i && n <= k) && 2 * i <= j) && n <= j) - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 92.2s, OverallIterations: 8, TraceHistogramMax: 5, AutomataDifference: 88.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 2.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 240 SDtfs, 129 SDslu, 627 SDs, 0 SdLazy, 624 SolverSat, 133 SolverUnsat, 20 SolverUnknown, 0 SolverNotchecked, 42.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 357 GetRequests, 273 SyntacticMatches, 10 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 389 ImplicationChecksByTransitivity, 45.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=120occurred in iteration=7, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 8 MinimizatonAttempts, 61 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 12 LocationsWithAnnotation, 52 PreInvPairs, 116 NumberOfFragments, 150 HoareAnnotationTreeSize, 52 FomulaSimplifications, 4179 FormulaSimplificationTreeSizeReduction, 0.4s HoareSimplificationTime, 12 FomulaSimplificationsInter, 807 FormulaSimplificationTreeSizeReductionInter, 1.5s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.0s InterpolantComputationTime, 223 NumberOfCodeBlocks, 180 NumberOfCodeBlocksAsserted, 26 NumberOfCheckSat, 315 ConstructedInterpolants, 1 QuantifiedInterpolants, 20354 SizeOfPredicates, 27 NumberOfNonLiveVariables, 442 ConjunctsInSsa, 41 ConjunctsInUnsatCore, 11 InterpolantComputations, 5 PerfectInterpolantSequences, 132/152 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...