/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/bitvector-loops/diamond_2-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 21:08:13,292 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 21:08:13,295 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 21:08:13,312 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 21:08:13,313 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 21:08:13,314 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 21:08:13,316 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 21:08:13,325 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 21:08:13,330 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 21:08:13,333 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 21:08:13,335 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 21:08:13,336 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 21:08:13,336 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 21:08:13,338 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 21:08:13,340 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 21:08:13,341 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 21:08:13,343 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 21:08:13,344 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 21:08:13,345 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 21:08:13,350 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 21:08:13,354 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 21:08:13,355 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 21:08:13,358 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 21:08:13,359 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 21:08:13,361 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 21:08:13,372 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 21:08:13,373 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 21:08:13,374 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 21:08:13,375 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 21:08:13,411 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 21:08:13,412 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 21:08:13,413 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 21:08:13,413 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 21:08:13,413 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 21:08:13,413 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 21:08:13,413 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 21:08:13,414 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 21:08:13,414 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 21:08:13,414 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 21:08:13,414 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 21:08:13,414 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 21:08:13,415 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 21:08:13,415 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 21:08:13,415 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 21:08:13,415 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 21:08:13,415 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 21:08:13,416 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 21:08:13,416 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 21:08:13,416 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 21:08:13,416 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 21:08:13,416 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 21:08:13,417 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 21:08:13,417 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 21:08:13,417 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 21:08:13,417 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 21:08:13,417 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:08:13,417 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 21:08:13,418 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 21:08:13,418 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> DAGSIZE Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 21:08:13,688 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 21:08:13,706 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 21:08:13,709 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 21:08:13,711 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 21:08:13,713 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 21:08:13,715 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/bitvector-loops/diamond_2-1.c [2020-07-20 21:08:13,786 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5ff9d98c3/e40c3551bb3b4b8ba6a83b5603f26a2f/FLAG44aa79565 [2020-07-20 21:08:14,229 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 21:08:14,230 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/bitvector-loops/diamond_2-1.c [2020-07-20 21:08:14,236 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5ff9d98c3/e40c3551bb3b4b8ba6a83b5603f26a2f/FLAG44aa79565 [2020-07-20 21:08:14,588 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5ff9d98c3/e40c3551bb3b4b8ba6a83b5603f26a2f [2020-07-20 21:08:14,598 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 21:08:14,601 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 21:08:14,602 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 21:08:14,602 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 21:08:14,605 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 21:08:14,606 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:08:14" (1/1) ... [2020-07-20 21:08:14,609 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@211823ff and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:08:14, skipping insertion in model container [2020-07-20 21:08:14,609 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:08:14" (1/1) ... [2020-07-20 21:08:14,618 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 21:08:14,639 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 21:08:14,826 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 21:08:14,830 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 21:08:14,849 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 21:08:14,861 INFO L208 MainTranslator]: Completed translation [2020-07-20 21:08:14,861 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:08:14 WrapperNode [2020-07-20 21:08:14,861 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 21:08:14,862 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 21:08:14,862 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 21:08:14,862 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 21:08:14,875 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:08:14" (1/1) ... [2020-07-20 21:08:14,876 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:08:14" (1/1) ... [2020-07-20 21:08:14,881 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:08:14" (1/1) ... [2020-07-20 21:08:14,882 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:08:14" (1/1) ... [2020-07-20 21:08:14,966 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:08:14" (1/1) ... [2020-07-20 21:08:14,972 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:08:14" (1/1) ... [2020-07-20 21:08:14,973 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:08:14" (1/1) ... [2020-07-20 21:08:14,975 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 21:08:14,975 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 21:08:14,975 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 21:08:14,975 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 21:08:14,976 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:08:14" (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 21:08:15,040 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 21:08:15,041 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 21:08:15,041 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 21:08:15,041 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 21:08:15,041 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 21:08:15,041 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-20 21:08:15,041 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 21:08:15,042 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 21:08:15,042 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 21:08:15,042 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 21:08:15,315 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 21:08:15,315 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 21:08:15,318 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:08:15 BoogieIcfgContainer [2020-07-20 21:08:15,319 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 21:08:15,320 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 21:08:15,320 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 21:08:15,323 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 21:08:15,323 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 09:08:14" (1/3) ... [2020-07-20 21:08:15,324 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@f7e2c9b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:08:15, skipping insertion in model container [2020-07-20 21:08:15,324 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:08:14" (2/3) ... [2020-07-20 21:08:15,324 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@f7e2c9b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:08:15, skipping insertion in model container [2020-07-20 21:08:15,324 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:08:15" (3/3) ... [2020-07-20 21:08:15,326 INFO L109 eAbstractionObserver]: Analyzing ICFG diamond_2-1.c [2020-07-20 21:08:15,334 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 21:08:15,341 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 21:08:15,351 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 21:08:15,372 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 21:08:15,373 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 21:08:15,373 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 21:08:15,373 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 21:08:15,373 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 21:08:15,373 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 21:08:15,373 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 21:08:15,374 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 21:08:15,390 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2020-07-20 21:08:15,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-07-20 21:08:15,395 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:08:15,396 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:08:15,396 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:08:15,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:08:15,401 INFO L82 PathProgramCache]: Analyzing trace with hash 1906239810, now seen corresponding path program 1 times [2020-07-20 21:08:15,407 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:08:15,407 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1934838816] [2020-07-20 21:08:15,408 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 21:08:15,478 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:08:15,479 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:08:15,482 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-20 21:08:15,489 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:08:15,514 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 21:08:15,515 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:08:15,516 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1934838816] [2020-07-20 21:08:15,517 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:08:15,517 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-20 21:08:15,518 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1165067584] [2020-07-20 21:08:15,522 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-20 21:08:15,523 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:08:15,537 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-20 21:08:15,538 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 21:08:15,540 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 2 states. [2020-07-20 21:08:15,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:08:15,564 INFO L93 Difference]: Finished difference Result 38 states and 51 transitions. [2020-07-20 21:08:15,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-20 21:08:15,565 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-07-20 21:08:15,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:08:15,573 INFO L225 Difference]: With dead ends: 38 [2020-07-20 21:08:15,574 INFO L226 Difference]: Without dead ends: 21 [2020-07-20 21:08:15,577 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 21:08:15,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-20 21:08:15,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-20 21:08:15,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 21:08:15,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 31 transitions. [2020-07-20 21:08:15,616 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 31 transitions. Word has length 10 [2020-07-20 21:08:15,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:08:15,617 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 31 transitions. [2020-07-20 21:08:15,617 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-20 21:08:15,617 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 31 transitions. [2020-07-20 21:08:15,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-07-20 21:08:15,618 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:08:15,618 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:08:15,832 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:08:15,832 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:08:15,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:08:15,833 INFO L82 PathProgramCache]: Analyzing trace with hash 1847134466, now seen corresponding path program 1 times [2020-07-20 21:08:15,834 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:08:15,835 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [493939674] [2020-07-20 21:08:15,835 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 21:08:15,862 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 21:08:15,863 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:08:15,864 INFO L263 TraceCheckSpWp]: Trace formula consists of 11 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 21:08:15,865 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:08:15,890 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 21:08:15,891 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:08:15,899 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [493939674] [2020-07-20 21:08:15,900 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:08:15,900 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 21:08:15,900 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [998571779] [2020-07-20 21:08:15,903 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 21:08:15,903 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:08:15,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 21:08:15,905 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:08:15,906 INFO L87 Difference]: Start difference. First operand 21 states and 31 transitions. Second operand 3 states. [2020-07-20 21:08:15,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:08:15,989 INFO L93 Difference]: Finished difference Result 28 states and 39 transitions. [2020-07-20 21:08:15,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 21:08:15,990 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-07-20 21:08:15,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:08:15,993 INFO L225 Difference]: With dead ends: 28 [2020-07-20 21:08:15,993 INFO L226 Difference]: Without dead ends: 23 [2020-07-20 21:08:15,994 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 21:08:15,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-20 21:08:16,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2020-07-20 21:08:16,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-07-20 21:08:16,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 32 transitions. [2020-07-20 21:08:16,002 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 32 transitions. Word has length 10 [2020-07-20 21:08:16,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:08:16,002 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 32 transitions. [2020-07-20 21:08:16,002 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 21:08:16,003 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 32 transitions. [2020-07-20 21:08:16,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 21:08:16,004 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:08:16,004 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:08:16,217 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:08:16,219 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:08:16,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:08:16,220 INFO L82 PathProgramCache]: Analyzing trace with hash -129940435, now seen corresponding path program 1 times [2020-07-20 21:08:16,221 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:08:16,222 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [26433871] [2020-07-20 21:08:16,222 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 21:08:16,256 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 21:08:16,256 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:08:16,257 INFO L263 TraceCheckSpWp]: Trace formula consists of 25 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 21:08:16,259 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:08:16,317 INFO L501 QuantifierPusher]: Distributing 3 conjuncts over 3 disjuncts [2020-07-20 21:08:16,322 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-20 21:08:16,332 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-20 21:08:16,335 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-20 21:08:16,355 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:08:16,355 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:08:16,356 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [26433871] [2020-07-20 21:08:16,356 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:08:16,356 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 21:08:16,357 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [799212666] [2020-07-20 21:08:16,357 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 21:08:16,357 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:08:16,358 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 21:08:16,358 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:08:16,358 INFO L87 Difference]: Start difference. First operand 22 states and 32 transitions. Second operand 3 states. [2020-07-20 21:08:16,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:08:16,446 INFO L93 Difference]: Finished difference Result 50 states and 81 transitions. [2020-07-20 21:08:16,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 21:08:16,446 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-20 21:08:16,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:08:16,448 INFO L225 Difference]: With dead ends: 50 [2020-07-20 21:08:16,448 INFO L226 Difference]: Without dead ends: 34 [2020-07-20 21:08:16,449 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 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 21:08:16,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-07-20 21:08:16,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-07-20 21:08:16,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-20 21:08:16,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 44 transitions. [2020-07-20 21:08:16,456 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 44 transitions. Word has length 21 [2020-07-20 21:08:16,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:08:16,457 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 44 transitions. [2020-07-20 21:08:16,457 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 21:08:16,457 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 44 transitions. [2020-07-20 21:08:16,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 21:08:16,458 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:08:16,458 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:08:16,673 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:08:16,674 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:08:16,675 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:08:16,675 INFO L82 PathProgramCache]: Analyzing trace with hash 263086575, now seen corresponding path program 1 times [2020-07-20 21:08:16,676 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:08:16,676 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [504560910] [2020-07-20 21:08:16,677 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 21:08:16,720 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:08:16,720 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:08:16,721 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-20 21:08:16,723 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:08:16,876 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 21:08:16,876 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:08:23,569 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 21:08:23,569 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [504560910] [2020-07-20 21:08:23,569 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:08:23,570 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 24 [2020-07-20 21:08:23,570 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [36172999] [2020-07-20 21:08:23,570 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 21:08:23,571 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:08:23,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 21:08:23,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=383, Unknown=3, NotChecked=0, Total=552 [2020-07-20 21:08:23,572 INFO L87 Difference]: Start difference. First operand 33 states and 44 transitions. Second operand 24 states. [2020-07-20 21:08:26,537 WARN L193 SmtUtils]: Spent 2.72 s on a formula simplification. DAG size of input: 56 DAG size of output: 11 [2020-07-20 21:08:27,029 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 11 [2020-07-20 21:08:31,090 WARN L193 SmtUtils]: Spent 3.85 s on a formula simplification. DAG size of input: 53 DAG size of output: 13 [2020-07-20 21:08:33,641 WARN L193 SmtUtils]: Spent 2.20 s on a formula simplification. DAG size of input: 41 DAG size of output: 11 [2020-07-20 21:08:36,582 WARN L193 SmtUtils]: Spent 2.15 s on a formula simplification. DAG size of input: 36 DAG size of output: 11 [2020-07-20 21:08:36,973 WARN L193 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 13 [2020-07-20 21:08:50,991 WARN L193 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 13 [2020-07-20 21:09:02,823 WARN L193 SmtUtils]: Spent 2.17 s on a formula simplification. DAG size of input: 43 DAG size of output: 13 [2020-07-20 21:09:07,197 WARN L193 SmtUtils]: Spent 2.08 s on a formula simplification that was a NOOP. DAG size: 16 [2020-07-20 21:09:25,130 WARN L193 SmtUtils]: Spent 2.15 s on a formula simplification. DAG size of input: 38 DAG size of output: 13 [2020-07-20 21:09:26,115 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 13 [2020-07-20 21:09:28,750 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 13 [2020-07-20 21:09:42,677 WARN L193 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 11 [2020-07-20 21:09:54,313 WARN L193 SmtUtils]: Spent 362.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 11 [2020-07-20 21:10:01,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:10:01,575 INFO L93 Difference]: Finished difference Result 120 states and 141 transitions. [2020-07-20 21:10:01,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-07-20 21:10:01,575 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 21 [2020-07-20 21:10:01,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:10:01,577 INFO L225 Difference]: With dead ends: 120 [2020-07-20 21:10:01,577 INFO L226 Difference]: Without dead ends: 115 [2020-07-20 21:10:01,578 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 19 SyntacticMatches, 6 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 231 ImplicationChecksByTransitivity, 71.4s TimeCoverageRelationStatistics Valid=614, Invalid=1097, Unknown=11, NotChecked=0, Total=1722 [2020-07-20 21:10:01,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2020-07-20 21:10:01,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 56. [2020-07-20 21:10:01,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 21:10:01,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 69 transitions. [2020-07-20 21:10:01,589 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 69 transitions. Word has length 21 [2020-07-20 21:10:01,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:10:01,589 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 69 transitions. [2020-07-20 21:10:01,589 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 21:10:01,589 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 69 transitions. [2020-07-20 21:10:01,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 21:10:01,590 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:10:01,590 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:10:01,797 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:10:01,797 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:10:01,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:10:01,798 INFO L82 PathProgramCache]: Analyzing trace with hash -402778255, now seen corresponding path program 1 times [2020-07-20 21:10:01,798 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:10:01,798 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1098005751] [2020-07-20 21:10:01,799 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 21:10:01,826 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:10:01,826 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:10:01,827 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 21:10:01,829 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:10:01,860 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 21:10:01,862 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-20 21:10:01,877 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:10:01,877 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:10:01,878 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1098005751] [2020-07-20 21:10:01,878 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:10:01,878 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 21:10:01,878 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1082706536] [2020-07-20 21:10:01,879 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 21:10:01,879 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:10:01,879 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 21:10:01,879 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:10:01,879 INFO L87 Difference]: Start difference. First operand 56 states and 69 transitions. Second operand 3 states. [2020-07-20 21:10:01,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:10:01,947 INFO L93 Difference]: Finished difference Result 83 states and 96 transitions. [2020-07-20 21:10:01,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 21:10:01,948 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-20 21:10:01,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:10:01,949 INFO L225 Difference]: With dead ends: 83 [2020-07-20 21:10:01,950 INFO L226 Difference]: Without dead ends: 57 [2020-07-20 21:10:01,950 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 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 21:10:01,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-20 21:10:01,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 55. [2020-07-20 21:10:01,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-20 21:10:01,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 57 transitions. [2020-07-20 21:10:01,967 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 57 transitions. Word has length 21 [2020-07-20 21:10:01,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:10:01,968 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 57 transitions. [2020-07-20 21:10:01,968 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 21:10:01,968 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 57 transitions. [2020-07-20 21:10:01,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 21:10:01,969 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:10:01,969 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:10:02,170 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:10:02,170 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:10:02,171 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:10:02,171 INFO L82 PathProgramCache]: Analyzing trace with hash -345519953, now seen corresponding path program 1 times [2020-07-20 21:10:02,171 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:10:02,172 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [380347447] [2020-07-20 21:10:02,172 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 21:10:02,204 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 21:10:02,205 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-20 21:10:02,205 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 21:10:02,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 21:10:02,214 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 21:10:02,226 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-20 21:10:02,226 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-20 21:10:02,437 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:10:02,459 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 09:10:02 BoogieIcfgContainer [2020-07-20 21:10:02,460 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 21:10:02,461 INFO L168 Benchmark]: Toolchain (without parser) took 107861.61 ms. Allocated memory was 146.8 MB in the beginning and 243.8 MB in the end (delta: 97.0 MB). Free memory was 104.6 MB in the beginning and 134.9 MB in the end (delta: -30.3 MB). Peak memory consumption was 66.7 MB. Max. memory is 7.1 GB. [2020-07-20 21:10:02,462 INFO L168 Benchmark]: CDTParser took 0.47 ms. Allocated memory is still 146.8 MB. Free memory was 123.0 MB in the beginning and 122.8 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. [2020-07-20 21:10:02,463 INFO L168 Benchmark]: CACSL2BoogieTranslator took 259.69 ms. Allocated memory is still 146.8 MB. Free memory was 104.4 MB in the beginning and 94.2 MB in the end (delta: 10.2 MB). Peak memory consumption was 10.2 MB. Max. memory is 7.1 GB. [2020-07-20 21:10:02,464 INFO L168 Benchmark]: Boogie Preprocessor took 112.86 ms. Allocated memory was 146.8 MB in the beginning and 203.9 MB in the end (delta: 57.1 MB). Free memory was 94.2 MB in the beginning and 182.7 MB in the end (delta: -88.4 MB). Peak memory consumption was 10.7 MB. Max. memory is 7.1 GB. [2020-07-20 21:10:02,464 INFO L168 Benchmark]: RCFGBuilder took 343.46 ms. Allocated memory is still 203.9 MB. Free memory was 182.7 MB in the beginning and 166.3 MB in the end (delta: 16.3 MB). Peak memory consumption was 16.3 MB. Max. memory is 7.1 GB. [2020-07-20 21:10:02,465 INFO L168 Benchmark]: TraceAbstraction took 107139.95 ms. Allocated memory was 203.9 MB in the beginning and 243.8 MB in the end (delta: 39.8 MB). Free memory was 165.7 MB in the beginning and 134.9 MB in the end (delta: 30.7 MB). Peak memory consumption was 70.6 MB. Max. memory is 7.1 GB. [2020-07-20 21:10:02,469 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.47 ms. Allocated memory is still 146.8 MB. Free memory was 123.0 MB in the beginning and 122.8 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 259.69 ms. Allocated memory is still 146.8 MB. Free memory was 104.4 MB in the beginning and 94.2 MB in the end (delta: 10.2 MB). Peak memory consumption was 10.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 112.86 ms. Allocated memory was 146.8 MB in the beginning and 203.9 MB in the end (delta: 57.1 MB). Free memory was 94.2 MB in the beginning and 182.7 MB in the end (delta: -88.4 MB). Peak memory consumption was 10.7 MB. Max. memory is 7.1 GB. * RCFGBuilder took 343.46 ms. Allocated memory is still 203.9 MB. Free memory was 182.7 MB in the beginning and 166.3 MB in the end (delta: 16.3 MB). Peak memory consumption was 16.3 MB. Max. memory is 7.1 GB. * TraceAbstraction took 107139.95 ms. Allocated memory was 203.9 MB in the beginning and 243.8 MB in the end (delta: 39.8 MB). Free memory was 165.7 MB in the beginning and 134.9 MB in the end (delta: 30.7 MB). Peak memory consumption was 70.6 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 6]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L12] unsigned int x = 0; [L13] unsigned int y = __VERIFIER_nondet_uint(); [L15] COND TRUE x < 99 VAL [x=0, y=3] [L16] COND FALSE !(y % 2 == 0) [L17] x += 2 VAL [x=2, y=3] [L19] COND FALSE !(y % 2 == 0) [L20] x -= 2 VAL [x=0, y=3] [L22] COND FALSE !(y % 2 == 0) [L23] x += 2 VAL [x=2, y=3] [L25] COND FALSE !(y % 2 == 0) [L26] x -= 2 VAL [x=0, y=3] [L28] COND FALSE !(y % 2 == 0) [L29] x += 2 VAL [x=2, y=3] [L31] COND FALSE !(y % 2 == 0) [L32] x -= 4 VAL [x=4294967294, y=3] [L34] COND FALSE !(y % 2 == 0) [L35] x += 4 VAL [x=2, y=3] [L37] COND FALSE !(y % 2 == 0) [L38] x += 2 VAL [x=4, y=3] [L40] COND FALSE !(y % 2 == 0) [L41] x -= 4 VAL [x=0, y=3] [L43] COND FALSE !(y % 2 == 0) [L44] x -= 4 VAL [x=4294967292, y=3] [L15] COND FALSE !(x < 99) VAL [x=4294967292, y=3] [L47] CALL __VERIFIER_assert((x % 2) == (y % 2)) VAL [\old(cond)=0] [L5] COND TRUE !(cond) VAL [\old(cond)=0, cond=0] [L6] __VERIFIER_error() VAL [\old(cond)=0, cond=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 27 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 107.0s, OverallIterations: 6, TraceHistogramMax: 1, AutomataDifference: 98.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 120 SDtfs, 62 SDslu, 124 SDs, 0 SdLazy, 699 SolverSat, 417 SolverUnsat, 15 SolverUnknown, 0 SolverNotchecked, 32.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 123 GetRequests, 74 SyntacticMatches, 6 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 231 ImplicationChecksByTransitivity, 71.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=56occurred in iteration=4, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 5 MinimizatonAttempts, 63 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 7.0s InterpolantComputationTime, 104 NumberOfCodeBlocks, 69 NumberOfCodeBlocksAsserted, 14 NumberOfCheckSat, 98 ConstructedInterpolants, 0 QuantifiedInterpolants, 4460 SizeOfPredicates, 4 NumberOfNonLiveVariables, 160 ConjunctsInSsa, 31 ConjunctsInUnsatCore, 6 InterpolantComputations, 4 PerfectInterpolantSequences, 2/4 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...