/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 BIGGEST_EQUIVALENCE_CLASS --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/nla-digbench/fermat2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 02:11:45,960 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 02:11:45,963 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 02:11:45,975 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-07-21 02:11:45,985 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 02:11:45,986 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 02:11:45,987 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 02:11:45,988 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 02:11:45,989 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 02:11:45,990 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 02:11:45,992 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 02:11:45,996 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 02:11:45,998 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 02:11:45,999 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 02:11:46,003 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 02:11:46,004 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 02:11:46,010 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 02:11:46,022 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 02:11:46,023 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 02:11:46,024 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 02:11:46,026 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 02:11:46,050 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 02:11:46,051 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 02:11:46,053 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 02:11:46,053 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 02:11:46,053 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 02:11:46,053 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 02:11:46,054 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 02:11:46,054 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 02:11:46,054 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 02:11:46,054 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 02:11:46,055 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 02:11:46,055 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 02:11:46,056 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 02:11:46,056 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 02:11:46,056 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 02:11:46,056 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 02:11:46,057 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 02:11:46,057 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 02:11:46,057 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 02:11:46,057 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 02:11:46,058 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 02:11:46,058 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 02:11:46,058 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 02:11:46,058 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 02:11:46,058 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 02:11:46,059 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 02:11:46,059 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 02:11:46,059 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 02:11:46,059 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 02:11:46,059 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 -> BIGGEST_EQUIVALENCE_CLASS 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 [2020-07-21 02:11:46,355 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 02:11:46,368 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 02:11:46,372 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 02:11:46,373 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 02:11:46,374 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 02:11:46,375 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench/fermat2.c [2020-07-21 02:11:46,439 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/61fd4d611/f5fe7a96036e495f8d457837c35ab9a9/FLAGb4aca0440 [2020-07-21 02:11:46,932 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 02:11:46,932 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/fermat2.c [2020-07-21 02:11:46,939 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/61fd4d611/f5fe7a96036e495f8d457837c35ab9a9/FLAGb4aca0440 [2020-07-21 02:11:47,268 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/61fd4d611/f5fe7a96036e495f8d457837c35ab9a9 [2020-07-21 02:11:47,277 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 02:11:47,280 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 02:11:47,281 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 02:11:47,281 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 02:11:47,285 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 02:11:47,286 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 02:11:47" (1/1) ... [2020-07-21 02:11:47,289 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@78d37557 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:11:47, skipping insertion in model container [2020-07-21 02:11:47,290 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 02:11:47" (1/1) ... [2020-07-21 02:11:47,298 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 02:11:47,316 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 02:11:47,525 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 02:11:47,530 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 02:11:47,552 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 02:11:47,567 INFO L208 MainTranslator]: Completed translation [2020-07-21 02:11:47,568 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:11:47 WrapperNode [2020-07-21 02:11:47,568 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 02:11:47,569 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 02:11:47,569 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 02:11:47,569 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 02:11:47,584 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:11:47" (1/1) ... [2020-07-21 02:11:47,584 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:11:47" (1/1) ... [2020-07-21 02:11:47,676 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:11:47" (1/1) ... [2020-07-21 02:11:47,677 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:11:47" (1/1) ... [2020-07-21 02:11:47,682 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:11:47" (1/1) ... [2020-07-21 02:11:47,686 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:11:47" (1/1) ... [2020-07-21 02:11:47,690 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:11:47" (1/1) ... [2020-07-21 02:11:47,692 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 02:11:47,693 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 02:11:47,693 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 02:11:47,693 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 02:11:47,694 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:11:47" (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 02:11:47,762 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 02:11:47,762 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 02:11:47,762 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 02:11:47,762 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 02:11:47,762 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 02:11:47,763 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 02:11:47,763 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_double [2020-07-21 02:11:47,763 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 02:11:47,763 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 02:11:47,763 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 02:11:47,763 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 02:11:47,763 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 02:11:47,764 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 02:11:47,964 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 02:11:47,965 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 02:11:47,969 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 02:11:47 BoogieIcfgContainer [2020-07-21 02:11:47,970 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 02:11:47,971 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 02:11:47,971 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 02:11:47,974 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 02:11:47,975 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 02:11:47" (1/3) ... [2020-07-21 02:11:47,976 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@38cc776e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 02:11:47, skipping insertion in model container [2020-07-21 02:11:47,976 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:11:47" (2/3) ... [2020-07-21 02:11:47,976 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@38cc776e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 02:11:47, skipping insertion in model container [2020-07-21 02:11:47,977 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 02:11:47" (3/3) ... [2020-07-21 02:11:47,978 INFO L109 eAbstractionObserver]: Analyzing ICFG fermat2.c [2020-07-21 02:11:47,989 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 02:11:47,999 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 02:11:48,016 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 02:11:48,049 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 02:11:48,049 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 02:11:48,050 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 02:11:48,050 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 02:11:48,050 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 02:11:48,050 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 02:11:48,051 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 02:11:48,051 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 02:11:48,082 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states. [2020-07-21 02:11:48,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 02:11:48,090 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 02:11:48,092 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 02:11:48,092 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 02:11:48,098 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 02:11:48,099 INFO L82 PathProgramCache]: Analyzing trace with hash -849943384, now seen corresponding path program 1 times [2020-07-21 02:11:48,108 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 02:11:48,109 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1226755591] [2020-07-21 02:11:48,110 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 [2020-07-21 02:11:48,197 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 02:11:48,197 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 02:11:48,200 INFO L263 TraceCheckSpWp]: Trace formula consists of 26 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-21 02:11:48,205 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 02:11:48,226 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 02:11:48,226 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 02:11:48,227 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1226755591] [2020-07-21 02:11:48,228 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 02:11:48,228 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-21 02:11:48,229 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [189944521] [2020-07-21 02:11:48,233 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-21 02:11:48,234 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 02:11:48,246 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-21 02:11:48,247 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 02:11:48,249 INFO L87 Difference]: Start difference. First operand 28 states. Second operand 2 states. [2020-07-21 02:11:48,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 02:11:48,275 INFO L93 Difference]: Finished difference Result 50 states and 67 transitions. [2020-07-21 02:11:48,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-21 02:11:48,276 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 21 [2020-07-21 02:11:48,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 02:11:48,284 INFO L225 Difference]: With dead ends: 50 [2020-07-21 02:11:48,284 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 02:11:48,287 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 20 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 02:11:48,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 02:11:48,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-07-21 02:11:48,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-07-21 02:11:48,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2020-07-21 02:11:48,324 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 21 [2020-07-21 02:11:48,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 02:11:48,325 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2020-07-21 02:11:48,325 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-21 02:11:48,325 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2020-07-21 02:11:48,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 02:11:48,327 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 02:11:48,328 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 02:11:48,537 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 02:11:48,538 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 02:11:48,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 02:11:48,539 INFO L82 PathProgramCache]: Analyzing trace with hash -1193991140, now seen corresponding path program 1 times [2020-07-21 02:11:48,540 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 02:11:48,541 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [360493701] [2020-07-21 02:11:48,541 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 [2020-07-21 02:11:48,591 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 02:11:48,591 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 02:11:48,593 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 02:11:48,595 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 02:11:48,711 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 02:12:01,353 WARN L193 SmtUtils]: Spent 8.30 s on a formula simplification that was a NOOP. DAG size: 28 [2020-07-21 02:12:01,357 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 02:12:16,704 WARN L193 SmtUtils]: Spent 8.36 s on a formula simplification that was a NOOP. DAG size: 28 [2020-07-21 02:12:18,742 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 02:12:26,969 WARN L838 $PredicateComparison]: unable to prove that (exists ((v_main_~u~0_BEFORE_CALL_1 Int)) (and (not (= (+ (* 2 v_main_~u~0_BEFORE_CALL_1) (* 4 (let ((.cse0 (div (+ (* v_main_~u~0_BEFORE_CALL_1 (- 1)) 1) (- 2)))) (* .cse0 .cse0)))) (+ (* v_main_~u~0_BEFORE_CALL_1 v_main_~u~0_BEFORE_CALL_1) 1))) (= 0 (mod (+ v_main_~u~0_BEFORE_CALL_1 1) (- 2))))) is different from false [2020-07-21 02:12:26,992 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 02:12:26,993 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 02:12:26,993 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [360493701] [2020-07-21 02:12:26,994 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 02:12:26,994 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 02:12:26,994 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1881441307] [2020-07-21 02:12:26,996 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 02:12:26,996 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 02:12:26,997 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 02:12:26,997 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=14, Unknown=1, NotChecked=6, Total=30 [2020-07-21 02:12:26,997 INFO L87 Difference]: Start difference. First operand 23 states and 26 transitions. Second operand 6 states. [2020-07-21 02:13:02,059 WARN L193 SmtUtils]: Spent 34.24 s on a formula simplification that was a NOOP. DAG size: 34 [2020-07-21 02:13:12,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 02:13:12,434 INFO L93 Difference]: Finished difference Result 32 states and 38 transitions. [2020-07-21 02:13:12,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 02:13:12,444 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 21 [2020-07-21 02:13:12,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 02:13:12,446 INFO L225 Difference]: With dead ends: 32 [2020-07-21 02:13:12,446 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 02:13:12,447 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 54.6s TimeCoverageRelationStatistics Valid=13, Invalid=20, Unknown=1, NotChecked=8, Total=42 [2020-07-21 02:13:12,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 02:13:12,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 27. [2020-07-21 02:13:12,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-21 02:13:12,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2020-07-21 02:13:12,467 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 21 [2020-07-21 02:13:12,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 02:13:12,469 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2020-07-21 02:13:12,469 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 02:13:12,470 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2020-07-21 02:13:12,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 02:13:12,471 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 02:13:12,472 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 02:13:12,673 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 02:13:12,676 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 02:13:12,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 02:13:12,677 INFO L82 PathProgramCache]: Analyzing trace with hash -1415100442, now seen corresponding path program 1 times [2020-07-21 02:13:12,677 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 02:13:12,678 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1741317359] [2020-07-21 02:13:12,678 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 [2020-07-21 02:13:12,711 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 02:13:12,711 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 02:13:12,713 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 02:13:12,715 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 02:13:12,811 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 02:13:13,038 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 02:13:13,038 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 02:13:13,084 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 02:13:13,266 INFO L320 QuantifierPusher]: Applying distributivity to a DISJUNCTION[2, 2, 2, 1] term [2020-07-21 02:13:13,266 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 02:13:13,308 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 02:13:13,463 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 02:13:13,464 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1741317359] [2020-07-21 02:13:13,465 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 02:13:13,465 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 10 [2020-07-21 02:13:13,465 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [184284086] [2020-07-21 02:13:13,466 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 02:13:13,466 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 02:13:13,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 02:13:13,467 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-07-21 02:13:13,467 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand 10 states. [2020-07-21 02:13:15,833 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-21 02:13:20,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 02:13:20,308 INFO L93 Difference]: Finished difference Result 33 states and 36 transitions. [2020-07-21 02:13:20,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 02:13:20,309 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-21 02:13:20,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 02:13:20,313 INFO L225 Difference]: With dead ends: 33 [2020-07-21 02:13:20,313 INFO L226 Difference]: Without dead ends: 26 [2020-07-21 02:13:20,314 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 43 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2020-07-21 02:13:20,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-07-21 02:13:20,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-07-21 02:13:20,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 02:13:20,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2020-07-21 02:13:20,321 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 27 [2020-07-21 02:13:20,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 02:13:20,321 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2020-07-21 02:13:20,321 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 02:13:20,322 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2020-07-21 02:13:20,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-21 02:13:20,323 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 02:13:20,323 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 02:13:20,537 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 02:13:20,538 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 02:13:20,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 02:13:20,538 INFO L82 PathProgramCache]: Analyzing trace with hash -1831429119, now seen corresponding path program 1 times [2020-07-21 02:13:20,539 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 02:13:20,539 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [726918765] [2020-07-21 02:13:20,539 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 [2020-07-21 02:13:20,575 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 02:13:20,575 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 02:13:20,576 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 02:13:20,578 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 02:13:22,748 WARN L193 SmtUtils]: Spent 2.07 s on a formula simplification that was a NOOP. DAG size: 23 [2020-07-21 02:13:25,277 WARN L193 SmtUtils]: Spent 2.33 s on a formula simplification that was a NOOP. DAG size: 21 [2020-07-21 02:13:25,296 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 02:13:25,521 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 02:13:25,522 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 02:13:25,653 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 02:13:25,903 INFO L320 QuantifierPusher]: Applying distributivity to a DISJUNCTION[2, 2, 2, 1] term [2020-07-21 02:13:25,904 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 02:13:25,917 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 02:13:26,097 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 02:13:26,097 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [726918765] [2020-07-21 02:13:26,097 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 02:13:26,097 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 11 [2020-07-21 02:13:26,098 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [933696293] [2020-07-21 02:13:26,098 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 02:13:26,098 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 02:13:26,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 02:13:26,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2020-07-21 02:13:26,099 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand 11 states. [2020-07-21 02:13:37,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 02:13:37,124 INFO L93 Difference]: Finished difference Result 40 states and 46 transitions. [2020-07-21 02:13:37,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 02:13:37,125 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 29 [2020-07-21 02:13:37,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 02:13:37,126 INFO L225 Difference]: With dead ends: 40 [2020-07-21 02:13:37,126 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 02:13:37,127 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2020-07-21 02:13:37,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 02:13:37,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 32. [2020-07-21 02:13:37,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-07-21 02:13:37,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2020-07-21 02:13:37,138 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 29 [2020-07-21 02:13:37,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 02:13:37,139 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2020-07-21 02:13:37,139 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 02:13:37,139 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2020-07-21 02:13:37,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-21 02:13:37,140 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 02:13:37,141 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 02:13:37,351 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 02:13:37,351 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 02:13:37,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 02:13:37,352 INFO L82 PathProgramCache]: Analyzing trace with hash -1774170817, now seen corresponding path program 1 times [2020-07-21 02:13:37,352 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 02:13:37,353 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [338266486] [2020-07-21 02:13:37,353 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 [2020-07-21 02:13:37,387 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 02:13:37,387 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 02:13:37,388 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 02:13:37,393 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 02:13:48,029 WARN L193 SmtUtils]: Spent 8.35 s on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 02:14:03,000 WARN L193 SmtUtils]: Spent 6.46 s on a formula simplification that was a NOOP. DAG size: 33 [2020-07-21 02:14:03,009 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 02:14:03,516 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 1 refuted. 2 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 02:14:03,517 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 02:14:03,719 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 02:14:08,667 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2020-07-21 02:14:08,852 WARN L193 SmtUtils]: Spent 184.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2020-07-21 02:14:08,855 INFO L320 QuantifierPusher]: Applying distributivity to a DISJUNCTION[2, 2, 2, 1] term [2020-07-21 02:14:08,856 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 02:14:08,864 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 02:14:09,046 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 02:14:09,046 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [338266486] [2020-07-21 02:14:09,053 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 02:14:09,053 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 11 [2020-07-21 02:14:09,054 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1020989440] [2020-07-21 02:14:09,054 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 02:14:09,054 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 02:14:09,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 02:14:09,055 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=78, Unknown=6, NotChecked=0, Total=110 [2020-07-21 02:14:09,055 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand 11 states. [2020-07-21 02:14:36,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 02:14:36,980 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2020-07-21 02:14:36,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 02:14:36,988 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 29 [2020-07-21 02:14:36,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 02:14:36,989 INFO L225 Difference]: With dead ends: 46 [2020-07-21 02:14:36,989 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 02:14:36,990 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 31.3s TimeCoverageRelationStatistics Valid=39, Invalid=111, Unknown=6, NotChecked=0, Total=156 [2020-07-21 02:14:36,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 02:14:36,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 02:14:36,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 02:14:36,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 02:14:36,991 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 29 [2020-07-21 02:14:36,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 02:14:36,991 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 02:14:36,992 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 02:14:36,992 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 02:14:36,992 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 02:14:37,202 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 02:14:37,206 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 02:15:01,281 WARN L193 SmtUtils]: Spent 23.98 s on a formula simplification. DAG size of input: 57 DAG size of output: 31 [2020-07-21 02:15:03,409 WARN L193 SmtUtils]: Spent 2.06 s on a formula simplification. DAG size of input: 35 DAG size of output: 1 [2020-07-21 02:15:31,961 WARN L193 SmtUtils]: Spent 28.55 s on a formula simplification. DAG size of input: 57 DAG size of output: 31 [2020-07-21 02:15:31,964 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 02:15:31,964 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 02:15:31,964 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 02:15:31,964 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 02:15:31,964 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 02:15:31,964 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 02:15:31,964 INFO L271 CegarLoopResult]: At program point assume_abort_if_notENTRY(lines 6 8) the Hoare annotation is: true [2020-07-21 02:15:31,964 INFO L268 CegarLoopResult]: For program point L7(line 7) no Hoare annotation was computed. [2020-07-21 02:15:31,965 INFO L268 CegarLoopResult]: For program point L7-2(lines 6 8) no Hoare annotation was computed. [2020-07-21 02:15:31,965 INFO L268 CegarLoopResult]: For program point assume_abort_if_notEXIT(lines 6 8) no Hoare annotation was computed. [2020-07-21 02:15:31,965 INFO L264 CegarLoopResult]: At program point L35-2(lines 31 42) the Hoare annotation is: (or (and (= 1 main_~v~0) (= (let ((.cse0 (div (+ (* main_~u~0 (- 1)) 1) (- 2)))) (* .cse0 .cse0)) (+ main_~A~0 main_~r~0)) (= 0 (mod (+ main_~u~0 1) (- 2)))) (= (+ (* main_~v~0 main_~v~0) (* main_~A~0 4) (* main_~r~0 4) (* main_~u~0 2)) (+ (* main_~v~0 2) (* main_~u~0 main_~u~0)))) [2020-07-21 02:15:31,965 INFO L264 CegarLoopResult]: At program point L31-2(lines 31 42) the Hoare annotation is: (let ((.cse0 (+ (* main_~u~0 main_~u~0) (* 2 main_~v~0))) (.cse1 (* main_~v~0 main_~v~0)) (.cse2 (* 2 main_~u~0)) (.cse3 (* 4 main_~A~0))) (and (= .cse0 (+ .cse1 .cse2 .cse3)) (= .cse0 (+ .cse1 .cse2 (* 4 main_~r~0) .cse3)))) [2020-07-21 02:15:31,965 INFO L268 CegarLoopResult]: For program point L25(line 25) no Hoare annotation was computed. [2020-07-21 02:15:31,966 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 17 47) no Hoare annotation was computed. [2020-07-21 02:15:31,966 INFO L271 CegarLoopResult]: At program point L23(line 23) the Hoare annotation is: true [2020-07-21 02:15:31,966 INFO L271 CegarLoopResult]: At program point L23-1(line 23) the Hoare annotation is: true [2020-07-21 02:15:31,966 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 17 47) no Hoare annotation was computed. [2020-07-21 02:15:31,966 INFO L264 CegarLoopResult]: At program point L32(line 32) the Hoare annotation is: (or (and (= 1 main_~v~0) (= (let ((.cse0 (div (+ (* main_~u~0 (- 1)) 1) (- 2)))) (* .cse0 .cse0)) (+ main_~A~0 main_~r~0)) (= 0 (mod (+ main_~u~0 1) (- 2)))) (= (+ (* main_~v~0 main_~v~0) (* main_~A~0 4) (* main_~r~0 4) (* main_~u~0 2)) (+ (* main_~v~0 2) (* main_~u~0 main_~u~0)))) [2020-07-21 02:15:31,966 INFO L268 CegarLoopResult]: For program point L32-1(lines 31 42) no Hoare annotation was computed. [2020-07-21 02:15:31,966 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 17 47) the Hoare annotation is: true [2020-07-21 02:15:31,967 INFO L268 CegarLoopResult]: For program point L45(line 45) no Hoare annotation was computed. [2020-07-21 02:15:31,967 INFO L268 CegarLoopResult]: For program point L35(lines 35 41) no Hoare annotation was computed. [2020-07-21 02:15:31,967 INFO L271 CegarLoopResult]: At program point __VERIFIER_assertENTRY(lines 9 15) the Hoare annotation is: true [2020-07-21 02:15:31,967 INFO L268 CegarLoopResult]: For program point L11(lines 11 12) no Hoare annotation was computed. [2020-07-21 02:15:31,967 INFO L268 CegarLoopResult]: For program point L10(lines 10 13) no Hoare annotation was computed. [2020-07-21 02:15:31,967 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertEXIT(lines 9 15) no Hoare annotation was computed. [2020-07-21 02:15:31,967 INFO L268 CegarLoopResult]: For program point L10-2(lines 9 15) no Hoare annotation was computed. [2020-07-21 02:15:31,967 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 12) no Hoare annotation was computed. [2020-07-21 02:15:31,982 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 02:15:31 BoogieIcfgContainer [2020-07-21 02:15:31,982 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 02:15:31,984 INFO L168 Benchmark]: Toolchain (without parser) took 224704.85 ms. Allocated memory was 145.2 MB in the beginning and 245.4 MB in the end (delta: 100.1 MB). Free memory was 103.3 MB in the beginning and 185.0 MB in the end (delta: -81.7 MB). Peak memory consumption was 18.5 MB. Max. memory is 7.1 GB. [2020-07-21 02:15:31,985 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 145.2 MB. Free memory was 121.4 MB in the beginning and 121.2 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-21 02:15:31,986 INFO L168 Benchmark]: CACSL2BoogieTranslator took 287.52 ms. Allocated memory is still 145.2 MB. Free memory was 102.9 MB in the beginning and 92.5 MB in the end (delta: 10.3 MB). Peak memory consumption was 10.3 MB. Max. memory is 7.1 GB. [2020-07-21 02:15:31,987 INFO L168 Benchmark]: Boogie Preprocessor took 123.29 ms. Allocated memory was 145.2 MB in the beginning and 202.4 MB in the end (delta: 57.1 MB). Free memory was 92.5 MB in the beginning and 180.1 MB in the end (delta: -87.5 MB). Peak memory consumption was 10.3 MB. Max. memory is 7.1 GB. [2020-07-21 02:15:31,987 INFO L168 Benchmark]: RCFGBuilder took 277.09 ms. Allocated memory is still 202.4 MB. Free memory was 180.1 MB in the beginning and 167.1 MB in the end (delta: 13.0 MB). Peak memory consumption was 13.0 MB. Max. memory is 7.1 GB. [2020-07-21 02:15:31,989 INFO L168 Benchmark]: TraceAbstraction took 224011.19 ms. Allocated memory was 202.4 MB in the beginning and 245.4 MB in the end (delta: 43.0 MB). Free memory was 166.4 MB in the beginning and 185.0 MB in the end (delta: -18.6 MB). Peak memory consumption was 24.4 MB. Max. memory is 7.1 GB. [2020-07-21 02:15:31,993 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 145.2 MB. Free memory was 121.4 MB in the beginning and 121.2 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 287.52 ms. Allocated memory is still 145.2 MB. Free memory was 102.9 MB in the beginning and 92.5 MB in the end (delta: 10.3 MB). Peak memory consumption was 10.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 123.29 ms. Allocated memory was 145.2 MB in the beginning and 202.4 MB in the end (delta: 57.1 MB). Free memory was 92.5 MB in the beginning and 180.1 MB in the end (delta: -87.5 MB). Peak memory consumption was 10.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 277.09 ms. Allocated memory is still 202.4 MB. Free memory was 180.1 MB in the beginning and 167.1 MB in the end (delta: 13.0 MB). Peak memory consumption was 13.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 224011.19 ms. Allocated memory was 202.4 MB in the beginning and 245.4 MB in the end (delta: 43.0 MB). Free memory was 166.4 MB in the beginning and 185.0 MB in the end (delta: -18.6 MB). Peak memory consumption was 24.4 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 12]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 31]: Loop Invariant Derived loop invariant: ((1 == v && (u * -1 + 1) / -2 * ((u * -1 + 1) / -2) == A + r) && 0 == (u + 1) % -2) || v * v + A * 4 + r * 4 + u * 2 == v * 2 + u * u - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 28 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 169.1s, OverallIterations: 5, TraceHistogramMax: 2, AutomataDifference: 91.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 54.7s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 114 SDtfs, 42 SDslu, 329 SDs, 0 SdLazy, 205 SolverSat, 10 SolverUnsat, 26 SolverUnknown, 0 SolverNotchecked, 54.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 215 GetRequests, 167 SyntacticMatches, 10 SemanticMatches, 38 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 91.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=32occurred 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, 9 StatesRemovedByMinimization, 2 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 11 LocationsWithAnnotation, 20 PreInvPairs, 32 NumberOfFragments, 152 HoareAnnotationTreeSize, 20 FomulaSimplifications, 144 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 11 FomulaSimplificationsInter, 295 FormulaSimplificationTreeSizeReductionInter, 54.6s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 76.3s InterpolantComputationTime, 127 NumberOfCodeBlocks, 118 NumberOfCodeBlocksAsserted, 18 NumberOfCheckSat, 204 ConstructedInterpolants, 9 QuantifiedInterpolants, 29746 SizeOfPredicates, 20 NumberOfNonLiveVariables, 249 ConjunctsInSsa, 54 ConjunctsInUnsatCore, 8 InterpolantComputations, 2 PerfectInterpolantSequences, 42/52 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...