/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/const_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 17:44:10,580 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 17:44:10,584 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 17:44:10,604 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 17:44:10,604 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 17:44:10,607 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 17:44:10,609 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 17:44:10,621 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 17:44:10,624 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 17:44:10,628 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 17:44:10,629 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 17:44:10,631 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 17:44:10,631 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 17:44:10,633 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 17:44:10,636 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 17:44:10,638 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 17:44:10,640 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 17:44:10,641 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 17:44:10,642 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 17:44:10,648 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 17:44:10,654 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 17:44:10,657 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 17:44:10,658 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 17:44:10,659 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 17:44:10,661 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 17:44:10,676 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 17:44:10,708 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 17:44:10,709 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 17:44:10,711 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 17:44:10,711 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 17:44:10,711 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 17:44:10,712 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 17:44:10,712 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 17:44:10,712 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 17:44:10,712 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 17:44:10,712 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 17:44:10,713 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 17:44:10,714 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 17:44:10,714 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 17:44:10,716 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 17:44:10,716 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 17:44:10,716 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 17:44:10,717 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 17:44:10,717 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 17:44:10,717 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 17:44:10,717 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 17:44:10,717 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 17:44:10,717 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 17:44:10,718 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 17:44:10,718 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 17:44:10,718 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 17:44:10,718 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 17:44:10,718 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:44:10,719 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 17:44:10,719 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 17:44:10,720 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 17:44:11,035 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 17:44:11,051 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 17:44:11,055 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 17:44:11,057 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 17:44:11,058 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 17:44:11,058 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/const_1-1.c [2020-07-20 17:44:11,140 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/92f6b9850/92c7f16eefd9454bb597d796b8051c63/FLAGbecbf3829 [2020-07-20 17:44:11,623 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 17:44:11,624 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/const_1-1.c [2020-07-20 17:44:11,631 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/92f6b9850/92c7f16eefd9454bb597d796b8051c63/FLAGbecbf3829 [2020-07-20 17:44:11,976 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/92f6b9850/92c7f16eefd9454bb597d796b8051c63 [2020-07-20 17:44:11,987 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 17:44:11,990 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 17:44:11,991 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 17:44:11,991 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 17:44:11,995 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 17:44:11,996 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:44:11" (1/1) ... [2020-07-20 17:44:11,999 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@19560d8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:44:11, skipping insertion in model container [2020-07-20 17:44:11,999 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:44:11" (1/1) ... [2020-07-20 17:44:12,007 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 17:44:12,025 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 17:44:12,198 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:44:12,201 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 17:44:12,216 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:44:12,228 INFO L208 MainTranslator]: Completed translation [2020-07-20 17:44:12,229 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:44:12 WrapperNode [2020-07-20 17:44:12,229 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 17:44:12,230 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 17:44:12,230 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 17:44:12,230 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 17:44:12,240 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:44:12" (1/1) ... [2020-07-20 17:44:12,241 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:44:12" (1/1) ... [2020-07-20 17:44:12,245 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:44:12" (1/1) ... [2020-07-20 17:44:12,246 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:44:12" (1/1) ... [2020-07-20 17:44:12,249 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:44:12" (1/1) ... [2020-07-20 17:44:12,254 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:44:12" (1/1) ... [2020-07-20 17:44:12,254 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:44:12" (1/1) ... [2020-07-20 17:44:12,332 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 17:44:12,333 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 17:44:12,333 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 17:44:12,333 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 17:44:12,334 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:44:12" (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 17:44:12,395 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 17:44:12,395 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 17:44:12,395 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 17:44:12,395 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 17:44:12,395 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 17:44:12,395 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 17:44:12,396 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 17:44:12,396 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 17:44:12,396 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 17:44:12,592 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 17:44:12,593 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 17:44:12,597 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:44:12 BoogieIcfgContainer [2020-07-20 17:44:12,597 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 17:44:12,598 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 17:44:12,599 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 17:44:12,602 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 17:44:12,602 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 05:44:11" (1/3) ... [2020-07-20 17:44:12,603 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@671541b0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:44:12, skipping insertion in model container [2020-07-20 17:44:12,603 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:44:12" (2/3) ... [2020-07-20 17:44:12,604 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@671541b0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:44:12, skipping insertion in model container [2020-07-20 17:44:12,604 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:44:12" (3/3) ... [2020-07-20 17:44:12,605 INFO L109 eAbstractionObserver]: Analyzing ICFG const_1-1.c [2020-07-20 17:44:12,617 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 17:44:12,625 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 17:44:12,639 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 17:44:12,666 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 17:44:12,666 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 17:44:12,666 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 17:44:12,667 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 17:44:12,667 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 17:44:12,667 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 17:44:12,667 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 17:44:12,667 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 17:44:12,686 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-07-20 17:44:12,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-07-20 17:44:12,690 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:44:12,691 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:44:12,692 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:44:12,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:44:12,696 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-07-20 17:44:12,703 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:44:12,704 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1842840795] [2020-07-20 17:44:12,704 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 17:44:12,762 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:44:12,763 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:44:12,765 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:44:12,771 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:44:12,831 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 17:44:12,831 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:44:12,833 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1842840795] [2020-07-20 17:44:12,834 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:44:12,834 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:44:12,836 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1285826394] [2020-07-20 17:44:12,842 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:44:12,843 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:44:12,858 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:44:12,859 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:44:12,862 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-07-20 17:44:12,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:44:12,897 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-07-20 17:44:12,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:44:12,899 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-07-20 17:44:12,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:44:12,908 INFO L225 Difference]: With dead ends: 29 [2020-07-20 17:44:12,908 INFO L226 Difference]: Without dead ends: 12 [2020-07-20 17:44:12,912 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:44:12,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-07-20 17:44:12,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-07-20 17:44:12,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-07-20 17:44:12,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-07-20 17:44:12,953 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-07-20 17:44:12,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:44:12,954 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-07-20 17:44:12,954 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:44:12,954 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-07-20 17:44:12,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-07-20 17:44:12,955 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:44:12,957 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:44:13,172 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:44:13,173 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:44:13,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:44:13,174 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-07-20 17:44:13,174 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:44:13,175 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1364526034] [2020-07-20 17:44:13,175 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 17:44:13,207 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:44:13,208 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:44:13,209 INFO L263 TraceCheckSpWp]: Trace formula consists of 26 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 17:44:13,211 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:44:13,243 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:44:13,244 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:44:13,352 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:44:13,353 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1364526034] [2020-07-20 17:44:13,353 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:44:13,355 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-07-20 17:44:13,355 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1045081063] [2020-07-20 17:44:13,357 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 17:44:13,358 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:44:13,358 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 17:44:13,359 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2020-07-20 17:44:13,360 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 6 states. [2020-07-20 17:44:13,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:44:13,437 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2020-07-20 17:44:13,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 17:44:13,438 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 11 [2020-07-20 17:44:13,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:44:13,440 INFO L225 Difference]: With dead ends: 20 [2020-07-20 17:44:13,440 INFO L226 Difference]: Without dead ends: 15 [2020-07-20 17:44:13,441 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2020-07-20 17:44:13,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-07-20 17:44:13,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-07-20 17:44:13,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-07-20 17:44:13,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-07-20 17:44:13,447 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 11 [2020-07-20 17:44:13,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:44:13,448 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-07-20 17:44:13,448 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 17:44:13,448 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-07-20 17:44:13,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 17:44:13,449 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:44:13,449 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:44:13,664 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:44:13,665 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:44:13,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:44:13,667 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 2 times [2020-07-20 17:44:13,667 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:44:13,668 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1374089552] [2020-07-20 17:44:13,668 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 17:44:13,705 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:44:13,705 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:44:13,706 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 17:44:13,708 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:44:13,768 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:44:13,769 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:44:13,887 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:44:13,887 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1374089552] [2020-07-20 17:44:13,887 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:44:13,888 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-20 17:44:13,888 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1509438269] [2020-07-20 17:44:13,889 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 17:44:13,889 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:44:13,889 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 17:44:13,890 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2020-07-20 17:44:13,890 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 12 states. [2020-07-20 17:44:18,207 WARN L193 SmtUtils]: Spent 4.24 s on a formula simplification. DAG size of input: 26 DAG size of output: 11 [2020-07-20 17:44:20,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:44:20,591 INFO L93 Difference]: Finished difference Result 26 states and 31 transitions. [2020-07-20 17:44:20,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 17:44:20,593 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 14 [2020-07-20 17:44:20,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:44:20,594 INFO L225 Difference]: With dead ends: 26 [2020-07-20 17:44:20,594 INFO L226 Difference]: Without dead ends: 21 [2020-07-20 17:44:20,595 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=94, Invalid=146, Unknown=0, NotChecked=0, Total=240 [2020-07-20 17:44:20,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-20 17:44:20,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-20 17:44:20,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 17:44:20,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-07-20 17:44:20,602 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 14 [2020-07-20 17:44:20,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:44:20,602 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-07-20 17:44:20,602 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 17:44:20,602 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-07-20 17:44:20,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 17:44:20,603 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:44:20,604 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:44:20,816 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:44:20,817 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:44:20,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:44:20,818 INFO L82 PathProgramCache]: Analyzing trace with hash -1348629730, now seen corresponding path program 3 times [2020-07-20 17:44:20,819 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:44:20,819 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [870033020] [2020-07-20 17:44:20,820 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 17:44:20,884 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:44:20,885 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:44:20,886 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-20 17:44:20,888 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:44:21,049 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:44:21,049 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:44:36,148 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 50 refuted. 5 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:44:36,149 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [870033020] [2020-07-20 17:44:36,149 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:44:36,150 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 24 [2020-07-20 17:44:36,150 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1224242056] [2020-07-20 17:44:36,150 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 17:44:36,151 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:44:36,151 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 17:44:36,152 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=379, Unknown=7, NotChecked=0, Total=552 [2020-07-20 17:44:36,152 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 24 states. [2020-07-20 17:44:36,845 WARN L193 SmtUtils]: Spent 301.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 11 [2020-07-20 17:44:37,374 WARN L193 SmtUtils]: Spent 294.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 11 [2020-07-20 17:44:37,859 WARN L193 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 11 [2020-07-20 17:44:39,245 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 11 [2020-07-20 17:44:55,763 WARN L193 SmtUtils]: Spent 2.10 s on a formula simplification that was a NOOP. DAG size: 16 [2020-07-20 17:44:55,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:44:55,928 INFO L93 Difference]: Finished difference Result 38 states and 49 transitions. [2020-07-20 17:44:55,932 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-20 17:44:55,932 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 20 [2020-07-20 17:44:55,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:44:55,933 INFO L225 Difference]: With dead ends: 38 [2020-07-20 17:44:55,934 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 17:44:55,935 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 30.6s TimeCoverageRelationStatistics Valid=406, Invalid=708, Unknown=8, NotChecked=0, Total=1122 [2020-07-20 17:44:55,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 17:44:55,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-07-20 17:44:55,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-20 17:44:55,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-07-20 17:44:55,944 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 20 [2020-07-20 17:44:55,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:44:55,944 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-07-20 17:44:55,944 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 17:44:55,944 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-07-20 17:44:55,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-07-20 17:44:55,945 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:44:55,946 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:44:56,146 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:44:56,147 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:44:56,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:44:56,147 INFO L82 PathProgramCache]: Analyzing trace with hash 144400734, now seen corresponding path program 4 times [2020-07-20 17:44:56,147 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:44:56,148 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1039721076] [2020-07-20 17:44:56,148 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 17:44:56,335 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:44:56,335 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:44:56,336 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 47 conjunts are in the unsatisfiable core [2020-07-20 17:44:56,340 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:44:56,692 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:44:56,692 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:45:31,608 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 242 refuted. 11 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:45:31,609 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1039721076] [2020-07-20 17:45:31,609 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:45:31,610 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 48 [2020-07-20 17:45:31,610 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1193165755] [2020-07-20 17:45:31,610 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-07-20 17:45:31,611 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:45:31,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-07-20 17:45:31,613 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=622, Invalid=1618, Unknown=16, NotChecked=0, Total=2256 [2020-07-20 17:45:31,613 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 48 states. [2020-07-20 17:45:36,302 WARN L193 SmtUtils]: Spent 3.04 s on a formula simplification. DAG size of input: 116 DAG size of output: 11 [2020-07-20 17:45:40,819 WARN L193 SmtUtils]: Spent 3.09 s on a formula simplification. DAG size of input: 111 DAG size of output: 11 [2020-07-20 17:45:48,356 WARN L193 SmtUtils]: Spent 4.22 s on a formula simplification. DAG size of input: 106 DAG size of output: 11 [2020-07-20 17:45:53,419 WARN L193 SmtUtils]: Spent 1.57 s on a formula simplification. DAG size of input: 101 DAG size of output: 11 [2020-07-20 17:46:04,566 WARN L193 SmtUtils]: Spent 3.57 s on a formula simplification. DAG size of input: 96 DAG size of output: 11 [2020-07-20 17:46:10,256 WARN L193 SmtUtils]: Spent 464.00 ms on a formula simplification. DAG size of input: 91 DAG size of output: 11 [2020-07-20 17:46:17,363 WARN L193 SmtUtils]: Spent 663.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 11 [2020-07-20 17:46:27,870 WARN L193 SmtUtils]: Spent 572.00 ms on a formula simplification. DAG size of input: 81 DAG size of output: 11 [2020-07-20 17:46:33,052 WARN L193 SmtUtils]: Spent 543.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 11 [2020-07-20 17:46:45,923 WARN L193 SmtUtils]: Spent 1.60 s on a formula simplification. DAG size of input: 71 DAG size of output: 11 [2020-07-20 17:46:55,353 WARN L193 SmtUtils]: Spent 2.61 s on a formula simplification. DAG size of input: 66 DAG size of output: 11 [2020-07-20 17:47:08,451 WARN L193 SmtUtils]: Spent 2.46 s on a formula simplification. DAG size of input: 61 DAG size of output: 11 [2020-07-20 17:47:14,051 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 11 [2020-07-20 17:47:28,138 WARN L193 SmtUtils]: Spent 425.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 11 [2020-07-20 17:47:37,398 WARN L193 SmtUtils]: Spent 299.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 11 [2020-07-20 17:47:43,935 WARN L193 SmtUtils]: Spent 2.24 s on a formula simplification. DAG size of input: 41 DAG size of output: 11 [2020-07-20 17:47:52,401 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 11 [2020-07-20 17:48:11,041 WARN L193 SmtUtils]: Spent 2.12 s on a formula simplification. DAG size of input: 21 DAG size of output: 11 [2020-07-20 17:48:24,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:48:24,112 INFO L93 Difference]: Finished difference Result 62 states and 85 transitions. [2020-07-20 17:48:24,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-20 17:48:24,114 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 32 [2020-07-20 17:48:24,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:48:24,115 INFO L225 Difference]: With dead ends: 62 [2020-07-20 17:48:24,115 INFO L226 Difference]: Without dead ends: 57 [2020-07-20 17:48:24,118 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 253 ImplicationChecksByTransitivity, 207.0s TimeCoverageRelationStatistics Valid=1676, Invalid=3124, Unknown=30, NotChecked=0, Total=4830 [2020-07-20 17:48:24,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-20 17:48:24,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-07-20 17:48:24,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-07-20 17:48:24,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-07-20 17:48:24,129 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 32 [2020-07-20 17:48:24,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:48:24,130 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-07-20 17:48:24,130 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-07-20 17:48:24,130 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-07-20 17:48:24,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-07-20 17:48:24,132 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:48:24,132 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:48:24,335 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:48:24,336 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:48:24,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:48:24,337 INFO L82 PathProgramCache]: Analyzing trace with hash -726077986, now seen corresponding path program 5 times [2020-07-20 17:48:24,337 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:48:24,338 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1756762076] [2020-07-20 17:48:24,338 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 17:48:38,726 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:48:38,726 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:48:38,735 INFO L263 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 95 conjunts are in the unsatisfiable core [2020-07-20 17:48:38,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:48:40,276 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:48:40,277 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:50:52,423 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1031 refuted. 50 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:50:52,423 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1756762076] [2020-07-20 17:50:52,423 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:50:52,424 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49] total 96 [2020-07-20 17:50:52,424 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1107948728] [2020-07-20 17:50:52,425 INFO L459 AbstractCegarLoop]: Interpolant automaton has 96 states [2020-07-20 17:50:52,425 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:50:52,427 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2020-07-20 17:50:52,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2398, Invalid=6662, Unknown=60, NotChecked=0, Total=9120 [2020-07-20 17:50:52,430 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 96 states. [2020-07-20 17:50:56,587 WARN L838 $PredicateComparison]: unable to prove that (and (< (mod (+ c_main_~y~0 46) 4294967296) 1024) (< (mod (+ c_main_~y~0 33) 4294967296) 1024) (< (mod (+ c_main_~y~0 27) 4294967296) 1024) (< (mod (+ c_main_~y~0 8) 4294967296) 1024) (< (mod (+ c_main_~y~0 10) 4294967296) 1024) (< (mod (+ c_main_~y~0 38) 4294967296) 1024) (< (mod (+ c_main_~y~0 22) 4294967296) 1024) (< (mod (+ c_main_~y~0 5) 4294967296) 1024) (< (mod (+ c_main_~y~0 34) 4294967296) 1024) (< (mod (+ c_main_~y~0 28) 4294967296) 1024) (< (mod (+ c_main_~y~0 6) 4294967296) 1024) (< (mod (+ c_main_~y~0 20) 4294967296) 1024) (< (mod (+ c_main_~y~0 32) 4294967296) 1024) (< (mod (+ c_main_~y~0 11) 4294967296) 1024) (< (mod (+ c_main_~y~0 14) 4294967296) 1024) (< (mod (+ c_main_~y~0 42) 4294967296) 1024) (< (mod (+ c_main_~y~0 16) 4294967296) 1024) (< (mod (+ c_main_~y~0 45) 4294967296) 1024) (< (mod (+ c_main_~y~0 23) 4294967296) 1024) (< (mod (+ c_main_~y~0 1) 4294967296) 1024) (< (mod (+ c_main_~y~0 41) 4294967296) 1024) (< (mod (+ c_main_~y~0 44) 4294967296) 1024) (< (mod (+ c_main_~y~0 17) 4294967296) 1024) (< (mod (+ c_main_~y~0 24) 4294967296) 1024) (< (mod (+ c_main_~y~0 7) 4294967296) 1024) (< (mod (+ c_main_~y~0 21) 4294967296) 1024) (< (mod (+ c_main_~y~0 36) 4294967296) 1024) (< (mod (+ c_main_~y~0 15) 4294967296) 1024) (< (mod (+ c_main_~y~0 19) 4294967296) 1024) (< (mod (+ c_main_~y~0 37) 4294967296) 1024) (< (mod c_main_~y~0 4294967296) 1024) (< (mod (+ c_main_~y~0 26) 4294967296) 1024) (< (mod (+ c_main_~y~0 29) 4294967296) 1024) (< (mod (+ c_main_~y~0 18) 4294967296) 1024) (< (mod (+ c_main_~y~0 30) 4294967296) 1024) (< (mod (+ c_main_~y~0 13) 4294967296) 1024) (< (mod (+ c_main_~y~0 4) 4294967296) 1024) (< (mod (+ c_main_~y~0 40) 4294967296) 1024) (< (mod (+ c_main_~y~0 12) 4294967296) 1024) (< (mod (+ c_main_~y~0 31) 4294967296) 1024) (< (mod (+ c_main_~y~0 35) 4294967296) 1024) (< (mod (+ c_main_~y~0 3) 4294967296) 1024) (< (mod (+ c_main_~y~0 9) 4294967296) 1024) (< (mod (+ c_main_~y~0 43) 4294967296) 1024) (< (mod (+ c_main_~y~0 25) 4294967296) 1024) (< (mod (+ c_main_~y~0 39) 4294967296) 1024) (< (mod (+ c_main_~y~0 2) 4294967296) 1024)) is different from false [2020-07-20 17:51:21,300 WARN L193 SmtUtils]: Spent 16.21 s on a formula simplification. DAG size of input: 231 DAG size of output: 16 [2020-07-20 17:51:39,999 WARN L193 SmtUtils]: Spent 5.52 s on a formula simplification. DAG size of input: 226 DAG size of output: 11 [2020-07-20 17:52:07,290 WARN L193 SmtUtils]: Spent 11.64 s on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2020-07-20 17:52:39,283 WARN L193 SmtUtils]: Spent 9.74 s on a formula simplification. DAG size of input: 216 DAG size of output: 11 [2020-07-20 17:53:03,695 WARN L193 SmtUtils]: Spent 7.58 s on a formula simplification. DAG size of input: 211 DAG size of output: 11 [2020-07-20 17:53:29,098 WARN L193 SmtUtils]: Spent 8.75 s on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2020-07-20 17:54:20,242 WARN L193 SmtUtils]: Spent 11.66 s on a formula simplification. DAG size of input: 201 DAG size of output: 11 [2020-07-20 17:54:54,118 WARN L193 SmtUtils]: Spent 8.07 s on a formula simplification. DAG size of input: 196 DAG size of output: 11 [2020-07-20 17:55:35,177 WARN L193 SmtUtils]: Spent 8.06 s on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2020-07-20 17:55:37,229 WARN L838 $PredicateComparison]: unable to prove that (and (< (mod (+ c_main_~y~0 33) 4294967296) 1024) (< (mod (+ c_main_~y~0 27) 4294967296) 1024) (< (mod (+ c_main_~y~0 8) 4294967296) 1024) (< (mod (+ c_main_~y~0 10) 4294967296) 1024) (< (mod (+ c_main_~y~0 22) 4294967296) 1024) (< (mod (+ c_main_~y~0 5) 4294967296) 1024) (< (mod (+ c_main_~y~0 34) 4294967296) 1024) (< (mod (+ c_main_~y~0 28) 4294967296) 1024) (< (mod (+ c_main_~y~0 6) 4294967296) 1024) (< (mod (+ c_main_~y~0 20) 4294967296) 1024) (< (mod (+ c_main_~y~0 32) 4294967296) 1024) (< (mod (+ c_main_~y~0 11) 4294967296) 1024) (< (mod (+ c_main_~y~0 14) 4294967296) 1024) (< (mod (+ c_main_~y~0 16) 4294967296) 1024) (< (mod (+ c_main_~y~0 23) 4294967296) 1024) (< (mod (+ c_main_~y~0 1) 4294967296) 1024) (< (mod (+ c_main_~y~0 17) 4294967296) 1024) (< (mod (+ c_main_~y~0 24) 4294967296) 1024) (< (mod (+ c_main_~y~0 7) 4294967296) 1024) (< (mod (+ c_main_~y~0 21) 4294967296) 1024) (< (mod (+ c_main_~y~0 36) 4294967296) 1024) (< (mod (+ c_main_~y~0 15) 4294967296) 1024) (< (mod (+ c_main_~y~0 19) 4294967296) 1024) (< (mod c_main_~y~0 4294967296) 1024) (< (mod (+ c_main_~y~0 26) 4294967296) 1024) (< (mod (+ c_main_~y~0 29) 4294967296) 1024) (< (mod (+ c_main_~y~0 18) 4294967296) 1024) (< (mod (+ c_main_~y~0 30) 4294967296) 1024) (< (mod (+ c_main_~y~0 13) 4294967296) 1024) (< (mod (+ c_main_~y~0 4) 4294967296) 1024) (< (mod (+ c_main_~y~0 12) 4294967296) 1024) (< (mod (+ c_main_~y~0 31) 4294967296) 1024) (< (mod (+ c_main_~y~0 35) 4294967296) 1024) (< (mod (+ c_main_~y~0 3) 4294967296) 1024) (< (mod (+ c_main_~y~0 9) 4294967296) 1024) (< (mod (+ c_main_~y~0 25) 4294967296) 1024) (< (mod (+ c_main_~y~0 2) 4294967296) 1024)) is different from false [2020-07-20 17:56:10,838 WARN L193 SmtUtils]: Spent 4.85 s on a formula simplification. DAG size of input: 181 DAG size of output: 11 [2020-07-20 17:56:48,160 WARN L193 SmtUtils]: Spent 5.28 s on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2020-07-20 17:57:31,892 WARN L193 SmtUtils]: Spent 10.76 s on a formula simplification. DAG size of input: 171 DAG size of output: 11 [2020-07-20 17:58:14,744 WARN L193 SmtUtils]: Spent 4.37 s on a formula simplification. DAG size of input: 166 DAG size of output: 11