/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/bitvector-loops/diamond_2-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 12:56:00,920 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 12:56:00,923 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 12:56:00,943 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 12:56:00,944 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 12:56:00,946 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 12:56:00,948 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 12:56:00,959 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 12:56:00,964 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 12:56:00,966 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 12:56:00,971 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 12:56:00,972 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 12:56:00,972 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 12:56:00,974 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 12:56:00,975 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 12:56:00,977 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 12:56:00,978 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 12:56:00,980 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 12:56:00,982 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 12:56:00,986 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 12:56:00,990 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 12:56:00,993 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 12:56:00,994 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 12:56:00,994 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 12:56:00,998 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 12:56:01,009 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 12:56:01,010 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 12:56:01,012 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 12:56:01,013 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 12:56:01,051 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 12:56:01,051 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 12:56:01,053 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 12:56:01,054 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 12:56:01,054 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 12:56:01,054 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 12:56:01,056 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 12:56:01,057 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 12:56:01,057 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 12:56:01,057 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 12:56:01,057 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 12:56:01,057 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 12:56:01,058 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 12:56:01,058 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 12:56:01,058 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 12:56:01,058 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 12:56:01,058 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 12:56:01,059 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 12:56:01,059 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 12:56:01,059 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 12:56:01,059 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 12:56:01,061 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 12:56:01,062 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 12:56:01,062 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 12:56:01,062 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 12:56:01,062 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 12:56:01,062 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 12:56:01,063 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 12:56:01,063 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 12:56:01,063 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 12:56:01,354 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 12:56:01,367 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 12:56:01,371 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 12:56:01,372 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 12:56:01,373 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 12:56:01,374 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/bitvector-loops/diamond_2-1.c [2020-07-21 12:56:01,442 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9ecf9f9c7/b948944c88524ec7a39743a055ccdf12/FLAG53ea10be8 [2020-07-21 12:56:01,882 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 12:56:01,883 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/bitvector-loops/diamond_2-1.c [2020-07-21 12:56:01,889 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9ecf9f9c7/b948944c88524ec7a39743a055ccdf12/FLAG53ea10be8 [2020-07-21 12:56:02,290 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9ecf9f9c7/b948944c88524ec7a39743a055ccdf12 [2020-07-21 12:56:02,298 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 12:56:02,302 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 12:56:02,303 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 12:56:02,303 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 12:56:02,309 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 12:56:02,310 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 12:56:02" (1/1) ... [2020-07-21 12:56:02,313 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3c612bd2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:56:02, skipping insertion in model container [2020-07-21 12:56:02,313 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 12:56:02" (1/1) ... [2020-07-21 12:56:02,321 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 12:56:02,338 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 12:56:02,507 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 12:56:02,512 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 12:56:02,541 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 12:56:02,552 INFO L208 MainTranslator]: Completed translation [2020-07-21 12:56:02,553 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:56:02 WrapperNode [2020-07-21 12:56:02,553 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 12:56:02,553 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 12:56:02,554 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 12:56:02,554 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 12:56:02,647 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:56:02" (1/1) ... [2020-07-21 12:56:02,648 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:56:02" (1/1) ... [2020-07-21 12:56:02,654 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:56:02" (1/1) ... [2020-07-21 12:56:02,654 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:56:02" (1/1) ... [2020-07-21 12:56:02,660 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:56:02" (1/1) ... [2020-07-21 12:56:02,666 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:56:02" (1/1) ... [2020-07-21 12:56:02,667 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:56:02" (1/1) ... [2020-07-21 12:56:02,669 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 12:56:02,672 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 12:56:02,673 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 12:56:02,673 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 12:56:02,674 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:56:02" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 12:56:02,740 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 12:56:02,740 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 12:56:02,740 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 12:56:02,741 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 12:56:02,741 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 12:56:02,741 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-21 12:56:02,741 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 12:56:02,741 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 12:56:02,741 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 12:56:02,742 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 12:56:03,011 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 12:56:03,011 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 12:56:03,015 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 12:56:03 BoogieIcfgContainer [2020-07-21 12:56:03,015 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 12:56:03,016 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 12:56:03,017 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 12:56:03,020 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 12:56:03,020 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 12:56:02" (1/3) ... [2020-07-21 12:56:03,021 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@58382b34 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 12:56:03, skipping insertion in model container [2020-07-21 12:56:03,022 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:56:02" (2/3) ... [2020-07-21 12:56:03,022 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@58382b34 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 12:56:03, skipping insertion in model container [2020-07-21 12:56:03,022 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 12:56:03" (3/3) ... [2020-07-21 12:56:03,024 INFO L109 eAbstractionObserver]: Analyzing ICFG diamond_2-1.c [2020-07-21 12:56:03,035 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 12:56:03,049 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 12:56:03,097 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 12:56:03,136 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 12:56:03,137 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 12:56:03,137 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 12:56:03,137 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 12:56:03,137 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 12:56:03,137 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 12:56:03,137 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 12:56:03,137 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 12:56:03,158 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2020-07-21 12:56:03,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-07-21 12:56:03,164 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 12:56:03,165 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 12:56:03,166 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 12:56:03,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 12:56:03,173 INFO L82 PathProgramCache]: Analyzing trace with hash 1906239810, now seen corresponding path program 1 times [2020-07-21 12:56:03,182 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 12:56:03,183 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1438473579] [2020-07-21 12:56:03,184 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 12:56:03,245 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 12:56:03,245 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 12:56:03,248 INFO L263 TraceCheckSpWp]: Trace formula consists of 24 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-21 12:56:03,253 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 12:56:03,269 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 12:56:03,269 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 12:56:03,270 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1438473579] [2020-07-21 12:56:03,271 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 12:56:03,271 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-21 12:56:03,272 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [158199350] [2020-07-21 12:56:03,277 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-21 12:56:03,278 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 12:56:03,289 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-21 12:56:03,290 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 12:56:03,292 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 2 states. [2020-07-21 12:56:03,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 12:56:03,314 INFO L93 Difference]: Finished difference Result 38 states and 51 transitions. [2020-07-21 12:56:03,314 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-21 12:56:03,315 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-07-21 12:56:03,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 12:56:03,323 INFO L225 Difference]: With dead ends: 38 [2020-07-21 12:56:03,324 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 12:56:03,327 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 12:56:03,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 12:56:03,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 12:56:03,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 12:56:03,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 31 transitions. [2020-07-21 12:56:03,364 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 31 transitions. Word has length 10 [2020-07-21 12:56:03,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 12:56:03,365 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 31 transitions. [2020-07-21 12:56:03,365 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-21 12:56:03,365 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 31 transitions. [2020-07-21 12:56:03,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-07-21 12:56:03,366 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 12:56:03,366 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 12:56:03,572 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 12:56:03,572 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 12:56:03,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 12:56:03,573 INFO L82 PathProgramCache]: Analyzing trace with hash 1847134466, now seen corresponding path program 1 times [2020-07-21 12:56:03,574 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 12:56:03,575 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1256684919] [2020-07-21 12:56:03,576 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 12:56:03,600 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 12:56:03,601 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 12:56:03,601 INFO L263 TraceCheckSpWp]: Trace formula consists of 15 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 12:56:03,603 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 12:56:03,629 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 12:56:03,629 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 12:56:03,629 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1256684919] [2020-07-21 12:56:03,630 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 12:56:03,630 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 12:56:03,630 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [691356542] [2020-07-21 12:56:03,632 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 12:56:03,632 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 12:56:03,633 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 12:56:03,633 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 12:56:03,633 INFO L87 Difference]: Start difference. First operand 21 states and 31 transitions. Second operand 3 states. [2020-07-21 12:56:03,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 12:56:03,717 INFO L93 Difference]: Finished difference Result 28 states and 39 transitions. [2020-07-21 12:56:03,717 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 12:56:03,718 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-07-21 12:56:03,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 12:56:03,720 INFO L225 Difference]: With dead ends: 28 [2020-07-21 12:56:03,721 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 12:56:03,722 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 12:56:03,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 12:56:03,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2020-07-21 12:56:03,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-07-21 12:56:03,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 32 transitions. [2020-07-21 12:56:03,730 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 32 transitions. Word has length 10 [2020-07-21 12:56:03,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 12:56:03,731 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 32 transitions. [2020-07-21 12:56:03,731 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 12:56:03,731 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 32 transitions. [2020-07-21 12:56:03,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 12:56:03,732 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 12:56:03,732 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] [2020-07-21 12:56:03,946 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 12:56:03,947 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 12:56:03,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 12:56:03,950 INFO L82 PathProgramCache]: Analyzing trace with hash -129940435, now seen corresponding path program 1 times [2020-07-21 12:56:03,950 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 12:56:03,951 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [63292481] [2020-07-21 12:56:03,951 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 12:56:03,999 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 12:56:03,999 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 12:56:04,000 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 12:56:04,002 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 12:56:04,045 INFO L501 QuantifierPusher]: Distributing 3 conjuncts over 3 disjuncts [2020-07-21 12:56:04,049 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 12:56:04,058 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 12:56:04,062 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 12:56:04,079 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 12:56:04,080 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 12:56:04,080 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [63292481] [2020-07-21 12:56:04,080 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 12:56:04,080 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 12:56:04,081 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [198429037] [2020-07-21 12:56:04,081 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 12:56:04,081 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 12:56:04,082 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 12:56:04,082 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 12:56:04,082 INFO L87 Difference]: Start difference. First operand 22 states and 32 transitions. Second operand 3 states. [2020-07-21 12:56:04,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 12:56:04,177 INFO L93 Difference]: Finished difference Result 50 states and 81 transitions. [2020-07-21 12:56:04,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 12:56:04,177 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 12:56:04,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 12:56:04,179 INFO L225 Difference]: With dead ends: 50 [2020-07-21 12:56:04,180 INFO L226 Difference]: Without dead ends: 34 [2020-07-21 12:56:04,180 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 [2020-07-21 12:56:04,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-07-21 12:56:04,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-07-21 12:56:04,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-21 12:56:04,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 44 transitions. [2020-07-21 12:56:04,188 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 44 transitions. Word has length 21 [2020-07-21 12:56:04,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 12:56:04,189 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 44 transitions. [2020-07-21 12:56:04,189 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 12:56:04,189 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 44 transitions. [2020-07-21 12:56:04,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 12:56:04,190 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 12:56:04,190 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] [2020-07-21 12:56:04,403 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 12:56:04,404 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 12:56:04,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 12:56:04,405 INFO L82 PathProgramCache]: Analyzing trace with hash 263086575, now seen corresponding path program 1 times [2020-07-21 12:56:04,406 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 12:56:04,406 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1326651988] [2020-07-21 12:56:04,407 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 12:56:04,449 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 12:56:04,450 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 12:56:04,451 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-21 12:56:04,453 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 12:56:04,631 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 12:56:04,631 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 12:56:11,457 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 12:56:11,458 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1326651988] [2020-07-21 12:56:11,458 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 12:56:11,458 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 24 [2020-07-21 12:56:11,458 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1492189150] [2020-07-21 12:56:11,459 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 12:56:11,459 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 12:56:11,460 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 12:56:11,461 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=383, Unknown=3, NotChecked=0, Total=552 [2020-07-21 12:56:11,461 INFO L87 Difference]: Start difference. First operand 33 states and 44 transitions. Second operand 24 states. [2020-07-21 12:56:12,156 WARN L193 SmtUtils]: Spent 386.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 11 [2020-07-21 12:56:16,951 WARN L193 SmtUtils]: Spent 2.27 s on a formula simplification. DAG size of input: 41 DAG size of output: 11 [2020-07-21 12:56:17,489 WARN L193 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 13 [2020-07-21 12:56:21,504 WARN L193 SmtUtils]: Spent 224.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 11 [2020-07-21 12:56:26,251 WARN L193 SmtUtils]: Spent 2.25 s on a formula simplification. DAG size of input: 46 DAG size of output: 11 [2020-07-21 12:56:31,960 WARN L193 SmtUtils]: Spent 2.23 s on a formula simplification. DAG size of input: 48 DAG size of output: 13 [2020-07-21 12:56:38,651 WARN L193 SmtUtils]: Spent 2.16 s on a formula simplification. DAG size of input: 26 DAG size of output: 11 [2020-07-21 12:56:47,065 WARN L193 SmtUtils]: Spent 2.30 s on a formula simplification. DAG size of input: 48 DAG size of output: 13 [2020-07-21 12:56:58,983 WARN L193 SmtUtils]: Spent 2.18 s on a formula simplification. DAG size of input: 38 DAG size of output: 13 [2020-07-21 12:57:07,533 WARN L193 SmtUtils]: Spent 2.11 s on a formula simplification. DAG size of input: 16 DAG size of output: 11 [2020-07-21 12:57:23,479 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 13 [2020-07-21 12:57:28,106 WARN L193 SmtUtils]: Spent 2.20 s on a formula simplification. DAG size of input: 38 DAG size of output: 13 [2020-07-21 12:57:33,343 WARN L193 SmtUtils]: Spent 353.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 11 [2020-07-21 12:57:56,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 12:57:56,011 INFO L93 Difference]: Finished difference Result 114 states and 133 transitions. [2020-07-21 12:57:56,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-07-21 12:57:56,013 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 21 [2020-07-21 12:57:56,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 12:57:56,015 INFO L225 Difference]: With dead ends: 114 [2020-07-21 12:57:56,015 INFO L226 Difference]: Without dead ends: 109 [2020-07-21 12:57:56,017 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 19 SyntacticMatches, 5 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 239 ImplicationChecksByTransitivity, 67.1s TimeCoverageRelationStatistics Valid=616, Invalid=1098, Unknown=8, NotChecked=0, Total=1722 [2020-07-21 12:57:56,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2020-07-21 12:57:56,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 56. [2020-07-21 12:57:56,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 12:57:56,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 69 transitions. [2020-07-21 12:57:56,027 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 69 transitions. Word has length 21 [2020-07-21 12:57:56,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 12:57:56,027 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 69 transitions. [2020-07-21 12:57:56,027 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 12:57:56,027 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 69 transitions. [2020-07-21 12:57:56,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 12:57:56,028 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 12:57:56,029 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] [2020-07-21 12:57:56,229 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 12:57:56,230 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 12:57:56,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 12:57:56,231 INFO L82 PathProgramCache]: Analyzing trace with hash -402778255, now seen corresponding path program 1 times [2020-07-21 12:57:56,231 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 12:57:56,231 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [264298995] [2020-07-21 12:57:56,232 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 12:57:56,255 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 12:57:56,256 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 12:57:56,256 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 12:57:56,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 12:57:56,290 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 12:57:56,293 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 12:57:56,309 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 12:57:56,309 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 12:57:56,309 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [264298995] [2020-07-21 12:57:56,310 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 12:57:56,310 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 12:57:56,310 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [132811078] [2020-07-21 12:57:56,311 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 12:57:56,311 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 12:57:56,311 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 12:57:56,311 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 12:57:56,312 INFO L87 Difference]: Start difference. First operand 56 states and 69 transitions. Second operand 3 states. [2020-07-21 12:57:56,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 12:57:56,384 INFO L93 Difference]: Finished difference Result 83 states and 96 transitions. [2020-07-21 12:57:56,385 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 12:57:56,385 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 12:57:56,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 12:57:56,386 INFO L225 Difference]: With dead ends: 83 [2020-07-21 12:57:56,387 INFO L226 Difference]: Without dead ends: 57 [2020-07-21 12:57:56,387 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 [2020-07-21 12:57:56,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-21 12:57:56,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 55. [2020-07-21 12:57:56,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-21 12:57:56,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 57 transitions. [2020-07-21 12:57:56,396 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 57 transitions. Word has length 21 [2020-07-21 12:57:56,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 12:57:56,397 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 57 transitions. [2020-07-21 12:57:56,397 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 12:57:56,397 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 57 transitions. [2020-07-21 12:57:56,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 12:57:56,398 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 12:57:56,398 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] [2020-07-21 12:57:56,599 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 12:57:56,600 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 12:57:56,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 12:57:56,601 INFO L82 PathProgramCache]: Analyzing trace with hash -345519953, now seen corresponding path program 1 times [2020-07-21 12:57:56,601 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 12:57:56,602 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1676164664] [2020-07-21 12:57:56,602 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 12:57:56,630 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 12:57:56,631 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-21 12:57:56,631 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 12:57:56,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 12:57:56,644 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 12:57:56,667 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 12:57:56,670 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 12:57:56,881 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 12:57:56,904 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 12:57:56 BoogieIcfgContainer [2020-07-21 12:57:56,904 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 12:57:56,905 INFO L168 Benchmark]: Toolchain (without parser) took 114605.60 ms. Allocated memory was 144.7 MB in the beginning and 246.9 MB in the end (delta: 102.2 MB). Free memory was 102.1 MB in the beginning and 162.9 MB in the end (delta: -60.8 MB). Peak memory consumption was 41.4 MB. Max. memory is 7.1 GB. [2020-07-21 12:57:56,906 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 144.7 MB. Free memory was 120.9 MB in the beginning and 120.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-21 12:57:56,907 INFO L168 Benchmark]: CACSL2BoogieTranslator took 250.12 ms. Allocated memory is still 144.7 MB. Free memory was 101.9 MB in the beginning and 91.7 MB in the end (delta: 10.2 MB). Peak memory consumption was 10.2 MB. Max. memory is 7.1 GB. [2020-07-21 12:57:56,908 INFO L168 Benchmark]: Boogie Preprocessor took 115.67 ms. Allocated memory was 144.7 MB in the beginning and 202.4 MB in the end (delta: 57.7 MB). Free memory was 91.7 MB in the beginning and 180.5 MB in the end (delta: -88.7 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. [2020-07-21 12:57:56,909 INFO L168 Benchmark]: RCFGBuilder took 342.82 ms. Allocated memory is still 202.4 MB. Free memory was 180.5 MB in the beginning and 164.4 MB in the end (delta: 16.1 MB). Peak memory consumption was 16.1 MB. Max. memory is 7.1 GB. [2020-07-21 12:57:56,910 INFO L168 Benchmark]: TraceAbstraction took 113887.65 ms. Allocated memory was 202.4 MB in the beginning and 246.9 MB in the end (delta: 44.6 MB). Free memory was 163.7 MB in the beginning and 162.9 MB in the end (delta: 793.1 kB). Peak memory consumption was 45.4 MB. Max. memory is 7.1 GB. [2020-07-21 12:57:56,914 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 144.7 MB. Free memory was 120.9 MB in the beginning and 120.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 250.12 ms. Allocated memory is still 144.7 MB. Free memory was 101.9 MB in the beginning and 91.7 MB in the end (delta: 10.2 MB). Peak memory consumption was 10.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 115.67 ms. Allocated memory was 144.7 MB in the beginning and 202.4 MB in the end (delta: 57.7 MB). Free memory was 91.7 MB in the beginning and 180.5 MB in the end (delta: -88.7 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. * RCFGBuilder took 342.82 ms. Allocated memory is still 202.4 MB. Free memory was 180.5 MB in the beginning and 164.4 MB in the end (delta: 16.1 MB). Peak memory consumption was 16.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 113887.65 ms. Allocated memory was 202.4 MB in the beginning and 246.9 MB in the end (delta: 44.6 MB). Free memory was 163.7 MB in the beginning and 162.9 MB in the end (delta: 793.1 kB). Peak memory consumption was 45.4 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=4294967295] [L16] COND FALSE !(y % 2 == 0) [L17] x += 2 VAL [x=2, y=4294967295] [L19] COND FALSE !(y % 2 == 0) [L20] x -= 2 VAL [x=0, y=4294967295] [L22] COND FALSE !(y % 2 == 0) [L23] x += 2 VAL [x=2, y=4294967295] [L25] COND FALSE !(y % 2 == 0) [L26] x -= 2 VAL [x=0, y=4294967295] [L28] COND FALSE !(y % 2 == 0) [L29] x += 2 VAL [x=2, y=4294967295] [L31] COND FALSE !(y % 2 == 0) [L32] x -= 4 VAL [x=4294967294, y=4294967295] [L34] COND FALSE !(y % 2 == 0) [L35] x += 4 VAL [x=2, y=4294967295] [L37] COND FALSE !(y % 2 == 0) [L38] x += 2 VAL [x=4, y=4294967295] [L40] COND FALSE !(y % 2 == 0) [L41] x -= 4 VAL [x=0, y=4294967295] [L43] COND FALSE !(y % 2 == 0) [L44] x -= 4 VAL [x=4294967292, y=4294967295] [L15] COND FALSE !(x < 99) VAL [x=4294967292, y=4294967295] [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: 113.7s, OverallIterations: 6, TraceHistogramMax: 1, AutomataDifference: 104.8s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 120 SDtfs, 60 SDslu, 124 SDs, 0 SdLazy, 666 SolverSat, 415 SolverUnsat, 20 SolverUnknown, 0 SolverNotchecked, 42.8s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 122 GetRequests, 74 SyntacticMatches, 5 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 239 ImplicationChecksByTransitivity, 67.1s 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, 57 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 7.1s InterpolantComputationTime, 104 NumberOfCodeBlocks, 79 NumberOfCodeBlocksAsserted, 9 NumberOfCheckSat, 98 ConstructedInterpolants, 0 QuantifiedInterpolants, 4960 SizeOfPredicates, 4 NumberOfNonLiveVariables, 186 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...