/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 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/id_o1000.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 13:25:21,885 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 13:25:21,890 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 13:25:21,915 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 13:25:21,915 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 13:25:21,918 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 13:25:21,919 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 13:25:21,931 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 13:25:21,934 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 13:25:21,935 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 13:25:21,943 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 13:25:21,945 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 13:25:21,946 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 13:25:21,949 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 13:25:21,951 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 13:25:21,955 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 13:25:21,959 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 13:25:21,962 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 13:25:21,966 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 13:25:21,975 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 13:25:21,979 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 13:25:21,984 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 13:25:21,987 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 13:25:21,988 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 13:25:21,992 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 13:25:22,011 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 13:25:22,012 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 13:25:22,014 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 13:25:22,015 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 13:25:22,047 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 13:25:22,047 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 13:25:22,050 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 13:25:22,052 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 13:25:22,052 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 13:25:22,052 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 13:25:22,053 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 13:25:22,053 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 13:25:22,053 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 13:25:22,053 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 13:25:22,055 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 13:25:22,055 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 13:25:22,056 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 13:25:22,056 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 13:25:22,057 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 13:25:22,057 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 13:25:22,057 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 13:25:22,057 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 13:25:22,058 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 13:25:22,058 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 13:25:22,058 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 13:25:22,058 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 13:25:22,059 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 13:25:22,059 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 13:25:22,059 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 13:25:22,059 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 13:25:22,059 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:25:22,060 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 13:25:22,060 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 13:25:22,060 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 -> 2 [2020-07-21 13:25:22,470 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 13:25:22,489 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 13:25:22,494 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 13:25:22,497 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 13:25:22,497 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 13:25:22,498 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_o1000.c [2020-07-21 13:25:22,622 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c19639cba/dc7c928f4dc54d3e8cd835e944d32812/FLAG68c5de6cb [2020-07-21 13:25:23,229 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 13:25:23,230 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id_o1000.c [2020-07-21 13:25:23,237 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c19639cba/dc7c928f4dc54d3e8cd835e944d32812/FLAG68c5de6cb [2020-07-21 13:25:23,626 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c19639cba/dc7c928f4dc54d3e8cd835e944d32812 [2020-07-21 13:25:23,639 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 13:25:23,644 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 13:25:23,645 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 13:25:23,645 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 13:25:23,650 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 13:25:23,652 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:25:23" (1/1) ... [2020-07-21 13:25:23,657 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@55fc409a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:25:23, skipping insertion in model container [2020-07-21 13:25:23,657 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:25:23" (1/1) ... [2020-07-21 13:25:23,671 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 13:25:23,695 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 13:25:23,886 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 13:25:23,893 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 13:25:23,913 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 13:25:23,935 INFO L208 MainTranslator]: Completed translation [2020-07-21 13:25:23,935 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:25:23 WrapperNode [2020-07-21 13:25:23,936 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 13:25:23,937 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 13:25:23,937 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 13:25:23,938 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 13:25:23,954 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:25:23" (1/1) ... [2020-07-21 13:25:23,955 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:25:23" (1/1) ... [2020-07-21 13:25:23,961 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:25:23" (1/1) ... [2020-07-21 13:25:23,962 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:25:23" (1/1) ... [2020-07-21 13:25:23,966 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:25:23" (1/1) ... [2020-07-21 13:25:23,969 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:25:23" (1/1) ... [2020-07-21 13:25:23,970 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:25:23" (1/1) ... [2020-07-21 13:25:23,971 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 13:25:23,972 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 13:25:23,972 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 13:25:23,973 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 13:25:23,974 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:25:23" (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 13:25:24,167 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 13:25:24,167 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 13:25:24,167 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-07-21 13:25:24,168 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 13:25:24,168 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-21 13:25:24,168 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 13:25:24,168 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-07-21 13:25:24,168 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 13:25:24,169 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 13:25:24,169 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 13:25:24,370 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 13:25:24,370 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 13:25:24,376 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:25:24 BoogieIcfgContainer [2020-07-21 13:25:24,376 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 13:25:24,377 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 13:25:24,378 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 13:25:24,382 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 13:25:24,382 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 01:25:23" (1/3) ... [2020-07-21 13:25:24,383 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@41f3a773 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:25:24, skipping insertion in model container [2020-07-21 13:25:24,384 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:25:23" (2/3) ... [2020-07-21 13:25:24,384 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@41f3a773 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:25:24, skipping insertion in model container [2020-07-21 13:25:24,385 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:25:24" (3/3) ... [2020-07-21 13:25:24,387 INFO L109 eAbstractionObserver]: Analyzing ICFG id_o1000.c [2020-07-21 13:25:24,398 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 13:25:24,407 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 13:25:24,428 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 13:25:24,467 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 13:25:24,468 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 13:25:24,468 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 13:25:24,468 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 13:25:24,468 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 13:25:24,469 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 13:25:24,469 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 13:25:24,469 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 13:25:24,502 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-21 13:25:24,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 13:25:24,513 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:25:24,515 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:25:24,516 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:25:24,527 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:25:24,527 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2020-07-21 13:25:24,541 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:25:24,542 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1681413796] [2020-07-21 13:25:24,543 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 13:25:24,751 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:25:24,751 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:25:24,758 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 13:25:24,769 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:25:24,919 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 13:25:24,920 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:25:24,921 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1681413796] [2020-07-21 13:25:24,923 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:25:24,923 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 13:25:24,925 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [983547451] [2020-07-21 13:25:24,938 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 13:25:24,939 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:25:24,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 13:25:24,962 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 13:25:24,966 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-07-21 13:25:25,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:25:25,037 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2020-07-21 13:25:25,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 13:25:25,040 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 13:25:25,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:25:25,057 INFO L225 Difference]: With dead ends: 32 [2020-07-21 13:25:25,058 INFO L226 Difference]: Without dead ends: 18 [2020-07-21 13:25:25,063 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 13:25:25,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-21 13:25:25,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-21 13:25:25,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-21 13:25:25,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-07-21 13:25:25,124 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-07-21 13:25:25,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:25:25,125 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-07-21 13:25:25,126 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 13:25:25,126 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-07-21 13:25:25,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 13:25:25,129 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:25:25,129 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:25:25,344 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:25:25,345 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:25:25,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:25:25,346 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2020-07-21 13:25:25,347 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:25:25,347 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2003157730] [2020-07-21 13:25:25,348 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 13:25:25,404 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:25:25,404 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:25:25,406 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 13:25:25,409 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:25:25,499 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 13:25:25,500 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:25:25,757 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 13:25:25,758 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2003157730] [2020-07-21 13:25:25,758 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:25:25,759 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-21 13:25:25,759 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1924850828] [2020-07-21 13:25:25,762 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 13:25:25,762 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:25:25,763 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 13:25:25,764 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2020-07-21 13:25:25,764 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 12 states. [2020-07-21 13:25:27,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:25:27,943 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2020-07-21 13:25:27,944 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 13:25:27,945 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-07-21 13:25:27,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:25:27,946 INFO L225 Difference]: With dead ends: 30 [2020-07-21 13:25:27,946 INFO L226 Difference]: Without dead ends: 24 [2020-07-21 13:25:27,948 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2020-07-21 13:25:27,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-21 13:25:27,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-21 13:25:27,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-21 13:25:27,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-07-21 13:25:27,971 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 19 [2020-07-21 13:25:27,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:25:27,973 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-07-21 13:25:27,974 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 13:25:27,975 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-07-21 13:25:27,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 13:25:27,979 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:25:27,979 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:25:28,193 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:25:28,194 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:25:28,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:25:28,196 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 2 times [2020-07-21 13:25:28,197 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:25:28,197 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [755556248] [2020-07-21 13:25:28,197 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 13:25:28,266 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:25:28,266 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:25:28,268 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 13:25:28,272 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:25:28,437 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-21 13:25:28,437 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:25:29,157 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-21 13:25:29,157 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [755556248] [2020-07-21 13:25:29,158 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:25:29,158 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 20 [2020-07-21 13:25:29,159 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1571548820] [2020-07-21 13:25:29,160 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 13:25:29,160 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:25:29,160 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 13:25:29,161 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2020-07-21 13:25:29,161 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 20 states. [2020-07-21 13:25:31,673 WARN L193 SmtUtils]: Spent 2.10 s on a formula simplification that was a NOOP. DAG size: 13 [2020-07-21 13:25:31,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:25:31,768 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2020-07-21 13:25:31,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-21 13:25:31,769 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 31 [2020-07-21 13:25:31,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:25:31,770 INFO L225 Difference]: With dead ends: 42 [2020-07-21 13:25:31,770 INFO L226 Difference]: Without dead ends: 36 [2020-07-21 13:25:31,772 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=98, Invalid=454, Unknown=0, NotChecked=0, Total=552 [2020-07-21 13:25:31,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-21 13:25:31,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-07-21 13:25:31,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 13:25:31,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2020-07-21 13:25:31,782 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 31 [2020-07-21 13:25:31,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:25:31,782 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2020-07-21 13:25:31,783 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 13:25:31,783 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2020-07-21 13:25:31,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-07-21 13:25:31,785 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:25:31,785 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:25:31,988 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:25:31,989 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:25:31,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:25:31,990 INFO L82 PathProgramCache]: Analyzing trace with hash 1532150511, now seen corresponding path program 3 times [2020-07-21 13:25:31,990 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:25:31,991 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [274173044] [2020-07-21 13:25:31,991 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 13:25:32,065 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:25:32,065 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:25:32,068 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 36 conjunts are in the unsatisfiable core [2020-07-21 13:25:32,072 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:25:32,377 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-07-21 13:25:32,377 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:25:34,385 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-07-21 13:25:34,386 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [274173044] [2020-07-21 13:25:34,386 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:25:34,387 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 36 [2020-07-21 13:25:34,387 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [700985891] [2020-07-21 13:25:34,388 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-21 13:25:34,388 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:25:34,389 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-21 13:25:34,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1076, Unknown=0, NotChecked=0, Total=1260 [2020-07-21 13:25:34,390 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 36 states. [2020-07-21 13:25:35,265 WARN L193 SmtUtils]: Spent 189.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 13:25:35,875 WARN L193 SmtUtils]: Spent 208.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-21 13:25:36,392 WARN L193 SmtUtils]: Spent 189.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 13:25:40,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:25:40,219 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2020-07-21 13:25:40,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-07-21 13:25:40,221 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 55 [2020-07-21 13:25:40,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:25:40,224 INFO L225 Difference]: With dead ends: 66 [2020-07-21 13:25:40,224 INFO L226 Difference]: Without dead ends: 60 [2020-07-21 13:25:40,226 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 153 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=382, Invalid=1873, Unknown=1, NotChecked=0, Total=2256 [2020-07-21 13:25:40,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-21 13:25:40,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2020-07-21 13:25:40,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-21 13:25:40,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2020-07-21 13:25:40,239 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 55 [2020-07-21 13:25:40,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:25:40,240 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2020-07-21 13:25:40,240 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-21 13:25:40,240 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2020-07-21 13:25:40,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2020-07-21 13:25:40,244 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:25:40,244 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:25:40,454 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:25:40,455 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:25:40,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:25:40,456 INFO L82 PathProgramCache]: Analyzing trace with hash 1083048687, now seen corresponding path program 4 times [2020-07-21 13:25:40,456 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:25:40,456 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1437032400] [2020-07-21 13:25:40,457 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 13:25:40,527 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:25:40,528 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:25:40,531 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 67 conjunts are in the unsatisfiable core [2020-07-21 13:25:40,537 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:25:41,312 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2020-07-21 13:25:41,312 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:26:04,100 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 335 refuted. 10 times theorem prover too weak. 345 trivial. 0 not checked. [2020-07-21 13:26:04,100 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1437032400] [2020-07-21 13:26:04,101 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:26:04,101 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 68 [2020-07-21 13:26:04,101 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [268051016] [2020-07-21 13:26:04,103 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2020-07-21 13:26:04,103 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:26:04,104 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2020-07-21 13:26:04,108 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=616, Invalid=3932, Unknown=8, NotChecked=0, Total=4556 [2020-07-21 13:26:04,108 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 68 states. [2020-07-21 13:26:09,234 WARN L193 SmtUtils]: Spent 427.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 13 [2020-07-21 13:26:14,456 WARN L193 SmtUtils]: Spent 411.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 11 [2020-07-21 13:26:21,281 WARN L193 SmtUtils]: Spent 3.58 s on a formula simplification. DAG size of input: 73 DAG size of output: 13 [2020-07-21 13:26:29,612 WARN L193 SmtUtils]: Spent 2.58 s on a formula simplification. DAG size of input: 71 DAG size of output: 11 [2020-07-21 13:26:33,716 WARN L193 SmtUtils]: Spent 473.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 13 [2020-07-21 13:26:41,830 WARN L193 SmtUtils]: Spent 355.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 11 [2020-07-21 13:26:47,149 WARN L193 SmtUtils]: Spent 258.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 13 [2020-07-21 13:26:50,430 WARN L193 SmtUtils]: Spent 613.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 11 [2020-07-21 13:26:53,496 WARN L193 SmtUtils]: Spent 271.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 13 [2020-07-21 13:26:59,405 WARN L193 SmtUtils]: Spent 2.53 s on a formula simplification. DAG size of input: 56 DAG size of output: 11 [2020-07-21 13:27:04,182 WARN L193 SmtUtils]: Spent 334.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 13 [2020-07-21 13:27:11,844 WARN L193 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 11 [2020-07-21 13:27:17,807 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 13 [2020-07-21 13:27:26,253 WARN L193 SmtUtils]: Spent 474.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 11 [2020-07-21 13:27:31,800 WARN L193 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 13 [2020-07-21 13:27:34,147 WARN L193 SmtUtils]: Spent 361.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 11 [2020-07-21 13:27:44,511 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 11 [2020-07-21 13:27:51,712 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 13 [2020-07-21 13:27:57,752 WARN L193 SmtUtils]: Spent 1.44 s on a formula simplification. DAG size of input: 28 DAG size of output: 13 [2020-07-21 13:28:05,715 WARN L193 SmtUtils]: Spent 2.13 s on a formula simplification. DAG size of input: 23 DAG size of output: 13 [2020-07-21 13:28:14,836 WARN L193 SmtUtils]: Spent 2.13 s on a formula simplification. DAG size of input: 21 DAG size of output: 11 [2020-07-21 13:28:21,344 WARN L193 SmtUtils]: Spent 2.09 s on a formula simplification. DAG size of input: 18 DAG size of output: 13 [2020-07-21 13:28:32,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:28:32,643 INFO L93 Difference]: Finished difference Result 114 states and 130 transitions. [2020-07-21 13:28:32,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2020-07-21 13:28:32,644 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 103 [2020-07-21 13:28:32,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:28:32,647 INFO L225 Difference]: With dead ends: 114 [2020-07-21 13:28:32,648 INFO L226 Difference]: Without dead ends: 108 [2020-07-21 13:28:32,651 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 139 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 702 ImplicationChecksByTransitivity, 164.2s TimeCoverageRelationStatistics Valid=1522, Invalid=7581, Unknown=17, NotChecked=0, Total=9120 [2020-07-21 13:28:32,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-21 13:28:32,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 108. [2020-07-21 13:28:32,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2020-07-21 13:28:32,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 109 transitions. [2020-07-21 13:28:32,667 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 109 transitions. Word has length 103 [2020-07-21 13:28:32,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:28:32,668 INFO L479 AbstractCegarLoop]: Abstraction has 108 states and 109 transitions. [2020-07-21 13:28:32,668 INFO L480 AbstractCegarLoop]: Interpolant automaton has 68 states. [2020-07-21 13:28:32,668 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 109 transitions. [2020-07-21 13:28:32,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2020-07-21 13:28:32,672 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:28:32,672 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:28:32,874 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:28:32,874 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:28:32,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:28:32,875 INFO L82 PathProgramCache]: Analyzing trace with hash -935230737, now seen corresponding path program 5 times [2020-07-21 13:28:32,876 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:28:32,876 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [269355307] [2020-07-21 13:28:32,877 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 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 13:28:32,984 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:28:32,984 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:28:32,990 INFO L263 TraceCheckSpWp]: Trace formula consists of 402 conjuncts, 131 conjunts are in the unsatisfiable core [2020-07-21 13:28:32,996 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:28:35,827 INFO L134 CoverageAnalysis]: Checked inductivity of 2914 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2020-07-21 13:28:35,827 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:30:23,319 INFO L134 CoverageAnalysis]: Checked inductivity of 2914 backedges. 0 proven. 1414 refuted. 43 times theorem prover too weak. 1457 trivial. 0 not checked. [2020-07-21 13:30:23,321 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [269355307] [2020-07-21 13:30:23,321 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:30:23,321 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67] total 132 [2020-07-21 13:30:23,321 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [844774936] [2020-07-21 13:30:23,325 INFO L459 AbstractCegarLoop]: Interpolant automaton has 132 states [2020-07-21 13:30:23,325 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:30:23,326 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 132 interpolants. [2020-07-21 13:30:23,330 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2248, Invalid=15004, Unknown=40, NotChecked=0, Total=17292 [2020-07-21 13:30:23,331 INFO L87 Difference]: Start difference. First operand 108 states and 109 transitions. Second operand 132 states. [2020-07-21 13:31:13,163 WARN L193 SmtUtils]: Spent 2.86 s on a formula simplification. DAG size of input: 158 DAG size of output: 13 [2020-07-21 13:32:08,706 WARN L193 SmtUtils]: Spent 6.00 s on a formula simplification. DAG size of input: 156 DAG size of output: 11 [2020-07-21 13:33:03,105 WARN L193 SmtUtils]: Spent 6.43 s on a formula simplification. DAG size of input: 153 DAG size of output: 13 [2020-07-21 13:33:53,112 WARN L193 SmtUtils]: Spent 2.49 s on a formula simplification. DAG size of input: 151 DAG size of output: 11 [2020-07-21 13:34:49,085 WARN L193 SmtUtils]: Spent 6.76 s on a formula simplification. DAG size of input: 148 DAG size of output: 13 [2020-07-21 13:35:47,719 WARN L193 SmtUtils]: Spent 6.30 s on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2020-07-21 13:36:43,821 WARN L193 SmtUtils]: Spent 2.72 s on a formula simplification. DAG size of input: 143 DAG size of output: 13 [2020-07-21 13:37:37,864 WARN L193 SmtUtils]: Spent 4.83 s on a formula simplification. DAG size of input: 141 DAG size of output: 11 [2020-07-21 13:38:26,551 WARN L193 SmtUtils]: Spent 8.16 s on a formula simplification. DAG size of input: 138 DAG size of output: 13 [2020-07-21 13:38:28,571 WARN L838 $PredicateComparison]: unable to prove that (and (< (mod (+ |c_id_#res| 17) 4294967296) 1000) (< (mod (+ |c_id_#res| 16) 4294967296) 1000) (< (mod (+ |c_id_#res| 8) 4294967296) 1000) (< (mod (+ |c_id_#res| 14) 4294967296) 1000) (< (mod (+ |c_id_#res| 19) 4294967296) 1000) (< (mod (+ |c_id_#res| 2) 4294967296) 1000) (< (mod (+ |c_id_#res| 25) 4294967296) 1000) (< (mod (+ |c_id_#res| 22) 4294967296) 1000) (< (mod (+ |c_id_#res| 21) 4294967296) 1000) (< (mod (+ |c_id_#res| 20) 4294967296) 1000) (< (mod (+ |c_id_#res| 23) 4294967296) 1000) (< (mod (+ |c_id_#res| 24) 4294967296) 1000) (< (mod (+ |c_id_#res| 26) 4294967296) 1000) (< (mod |c_id_#res| 4294967296) 1000) (< (mod (+ |c_id_#res| 12) 4294967296) 1000) (< (mod (+ |c_id_#res| 3) 4294967296) 1000) (< (mod (+ |c_id_#res| 6) 4294967296) 1000) (< (mod (+ |c_id_#res| 15) 4294967296) 1000) (< (mod (+ |c_id_#res| 7) 4294967296) 1000) (< (mod (+ |c_id_#res| 13) 4294967296) 1000) (< (mod (+ |c_id_#res| 9) 4294967296) 1000) (< (mod (+ |c_id_#res| 4) 4294967296) 1000) (< (mod (+ |c_id_#res| 11) 4294967296) 1000) (< (mod (+ |c_id_#res| 5) 4294967296) 1000) (< (mod (+ |c_id_#res| 1) 4294967296) 1000) (< (mod (+ |c_id_#res| 18) 4294967296) 1000) (< (mod (+ |c_id_#res| 10) 4294967296) 1000)) is different from false [2020-07-21 13:39:19,401 WARN L193 SmtUtils]: Spent 4.76 s on a formula simplification. DAG size of input: 133 DAG size of output: 13