/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 NOT_INCREMENTALLY -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 10:40:29,421 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 10:40:29,423 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 10:40:29,436 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 10:40:29,436 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 10:40:29,437 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 10:40:29,438 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 10:40:29,440 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 10:40:29,442 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 10:40:29,443 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 10:40:29,444 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 10:40:29,445 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 10:40:29,445 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 10:40:29,446 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 10:40:29,447 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 10:40:29,448 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 10:40:29,449 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 10:40:29,450 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 10:40:29,452 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 10:40:29,454 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 10:40:29,455 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 10:40:29,456 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 10:40:29,457 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 10:40:29,458 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 10:40:29,460 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 10:40:29,467 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 10:40:29,468 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 10:40:29,469 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 10:40:29,470 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 10:40:29,483 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 10:40:29,484 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 10:40:29,485 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 10:40:29,485 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 10:40:29,485 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 10:40:29,485 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 10:40:29,485 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 10:40:29,486 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 10:40:29,486 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 10:40:29,486 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 10:40:29,486 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 10:40:29,486 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 10:40:29,487 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 10:40:29,487 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 10:40:29,487 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 10:40:29,487 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 10:40:29,487 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 10:40:29,488 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 10:40:29,488 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 10:40:29,488 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 10:40:29,488 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 10:40:29,488 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 10:40:29,489 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 10:40:29,489 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 10:40:29,489 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 10:40:29,489 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 10:40:29,489 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:40:29,489 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 10:40:29,490 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 10:40:29,490 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 -> NOT_INCREMENTALLY [2020-07-21 10:40:29,743 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 10:40:29,756 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 10:40:29,760 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 10:40:29,762 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 10:40:29,762 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 10:40:29,763 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/bitvector-loops/diamond_2-1.c [2020-07-21 10:40:29,844 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/373c8913b/b2e131bace0441d4a70711e958c5b6fd/FLAG920813323 [2020-07-21 10:40:30,325 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 10:40:30,326 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/bitvector-loops/diamond_2-1.c [2020-07-21 10:40:30,332 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/373c8913b/b2e131bace0441d4a70711e958c5b6fd/FLAG920813323 [2020-07-21 10:40:30,703 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/373c8913b/b2e131bace0441d4a70711e958c5b6fd [2020-07-21 10:40:30,711 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 10:40:30,714 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 10:40:30,715 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 10:40:30,715 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 10:40:30,718 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 10:40:30,719 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:40:30" (1/1) ... [2020-07-21 10:40:30,722 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1fdbb883 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:40:30, skipping insertion in model container [2020-07-21 10:40:30,722 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:40:30" (1/1) ... [2020-07-21 10:40:30,730 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 10:40:30,752 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 10:40:30,978 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 10:40:30,982 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 10:40:31,004 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 10:40:31,018 INFO L208 MainTranslator]: Completed translation [2020-07-21 10:40:31,018 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:40:31 WrapperNode [2020-07-21 10:40:31,019 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 10:40:31,019 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 10:40:31,019 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 10:40:31,020 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 10:40:31,110 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:40:31" (1/1) ... [2020-07-21 10:40:31,110 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:40:31" (1/1) ... [2020-07-21 10:40:31,115 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:40:31" (1/1) ... [2020-07-21 10:40:31,115 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:40:31" (1/1) ... [2020-07-21 10:40:31,120 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:40:31" (1/1) ... [2020-07-21 10:40:31,125 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:40:31" (1/1) ... [2020-07-21 10:40:31,127 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:40:31" (1/1) ... [2020-07-21 10:40:31,128 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 10:40:31,129 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 10:40:31,129 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 10:40:31,129 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 10:40:31,130 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:40:31" (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 10:40:31,194 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 10:40:31,194 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 10:40:31,195 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 10:40:31,195 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 10:40:31,195 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 10:40:31,195 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-21 10:40:31,195 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 10:40:31,195 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 10:40:31,196 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 10:40:31,196 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 10:40:31,471 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 10:40:31,472 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 10:40:31,475 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:40:31 BoogieIcfgContainer [2020-07-21 10:40:31,476 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 10:40:31,477 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 10:40:31,477 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 10:40:31,480 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 10:40:31,480 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 10:40:30" (1/3) ... [2020-07-21 10:40:31,481 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1460d0f5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:40:31, skipping insertion in model container [2020-07-21 10:40:31,481 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:40:31" (2/3) ... [2020-07-21 10:40:31,481 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1460d0f5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:40:31, skipping insertion in model container [2020-07-21 10:40:31,482 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:40:31" (3/3) ... [2020-07-21 10:40:31,483 INFO L109 eAbstractionObserver]: Analyzing ICFG diamond_2-1.c [2020-07-21 10:40:31,493 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 10:40:31,500 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 10:40:31,511 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 10:40:31,535 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 10:40:31,535 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 10:40:31,535 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 10:40:31,536 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 10:40:31,536 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 10:40:31,536 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 10:40:31,536 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 10:40:31,536 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 10:40:31,555 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2020-07-21 10:40:31,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-07-21 10:40:31,561 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:40:31,561 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:40:31,562 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:40:31,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:40:31,567 INFO L82 PathProgramCache]: Analyzing trace with hash 1906239810, now seen corresponding path program 1 times [2020-07-21 10:40:31,575 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:40:31,575 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1065702713] [2020-07-21 10:40:31,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 10:40:31,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:40:31,631 INFO L263 TraceCheckSpWp]: Trace formula consists of 24 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-21 10:40:31,640 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:40:31,673 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 10:40:31,674 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 10:40:31,675 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1065702713] [2020-07-21 10:40:31,676 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 10:40:31,676 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-21 10:40:31,678 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [359242733] [2020-07-21 10:40:31,684 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-21 10:40:31,685 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:40:31,703 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-21 10:40:31,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 10:40:31,706 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 2 states. [2020-07-21 10:40:31,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:40:31,734 INFO L93 Difference]: Finished difference Result 38 states and 51 transitions. [2020-07-21 10:40:31,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-21 10:40:31,736 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-07-21 10:40:31,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:40:31,744 INFO L225 Difference]: With dead ends: 38 [2020-07-21 10:40:31,745 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 10:40:31,748 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 10:40:31,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 10:40:31,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 10:40:31,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 10:40:31,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 31 transitions. [2020-07-21 10:40:31,791 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 31 transitions. Word has length 10 [2020-07-21 10:40:31,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:40:31,791 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 31 transitions. [2020-07-21 10:40:31,792 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-21 10:40:31,792 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 31 transitions. [2020-07-21 10:40:31,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-07-21 10:40:31,793 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:40:31,793 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:40:32,008 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:40:32,009 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:40:32,009 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:40:32,010 INFO L82 PathProgramCache]: Analyzing trace with hash 1847134466, now seen corresponding path program 1 times [2020-07-21 10:40:32,010 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:40:32,011 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1271614787] [2020-07-21 10:40:32,011 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 10:40:32,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:40:32,037 INFO L263 TraceCheckSpWp]: Trace formula consists of 24 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 10:40:32,038 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:40:32,073 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 10:40:32,073 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 10:40:32,074 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1271614787] [2020-07-21 10:40:32,074 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 10:40:32,074 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 10:40:32,075 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2087930036] [2020-07-21 10:40:32,076 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 10:40:32,076 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:40:32,076 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 10:40:32,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 10:40:32,079 INFO L87 Difference]: Start difference. First operand 21 states and 31 transitions. Second operand 3 states. [2020-07-21 10:40:32,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:40:32,168 INFO L93 Difference]: Finished difference Result 28 states and 39 transitions. [2020-07-21 10:40:32,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 10:40:32,169 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-07-21 10:40:32,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:40:32,172 INFO L225 Difference]: With dead ends: 28 [2020-07-21 10:40:32,172 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 10:40:32,174 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 10:40:32,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 10:40:32,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2020-07-21 10:40:32,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-07-21 10:40:32,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 32 transitions. [2020-07-21 10:40:32,182 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 32 transitions. Word has length 10 [2020-07-21 10:40:32,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:40:32,182 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 32 transitions. [2020-07-21 10:40:32,182 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 10:40:32,183 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 32 transitions. [2020-07-21 10:40:32,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 10:40:32,184 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:40:32,184 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 10:40:32,390 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:40:32,391 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:40:32,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:40:32,393 INFO L82 PathProgramCache]: Analyzing trace with hash -129940435, now seen corresponding path program 1 times [2020-07-21 10:40:32,393 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:40:32,394 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1624709275] [2020-07-21 10:40:32,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 10:40:32,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:40:32,437 INFO L263 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 10:40:32,440 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:40:32,483 INFO L501 QuantifierPusher]: Distributing 3 conjuncts over 3 disjuncts [2020-07-21 10:40:32,486 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 10:40:32,492 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 10:40:32,498 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 10:40:32,519 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 10:40:32,519 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 10:40:32,520 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1624709275] [2020-07-21 10:40:32,520 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 10:40:32,520 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 10:40:32,520 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1443555565] [2020-07-21 10:40:32,521 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 10:40:32,521 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:40:32,521 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 10:40:32,522 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 10:40:32,522 INFO L87 Difference]: Start difference. First operand 22 states and 32 transitions. Second operand 3 states. [2020-07-21 10:40:32,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:40:32,609 INFO L93 Difference]: Finished difference Result 50 states and 81 transitions. [2020-07-21 10:40:32,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 10:40:32,610 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 10:40:32,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:40:32,612 INFO L225 Difference]: With dead ends: 50 [2020-07-21 10:40:32,612 INFO L226 Difference]: Without dead ends: 34 [2020-07-21 10:40:32,613 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 10:40:32,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-07-21 10:40:32,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-07-21 10:40:32,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-21 10:40:32,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 44 transitions. [2020-07-21 10:40:32,620 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 44 transitions. Word has length 21 [2020-07-21 10:40:32,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:40:32,621 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 44 transitions. [2020-07-21 10:40:32,621 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 10:40:32,621 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 44 transitions. [2020-07-21 10:40:32,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 10:40:32,622 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:40:32,622 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 10:40:32,836 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:40:32,837 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:40:32,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:40:32,838 INFO L82 PathProgramCache]: Analyzing trace with hash 263086575, now seen corresponding path program 1 times [2020-07-21 10:40:32,839 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:40:32,839 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1375684491] [2020-07-21 10:40:32,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 10:40:32,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:40:32,896 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-21 10:40:32,899 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:40:33,060 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 10:40:33,060 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:40:35,647 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 10:40:35,648 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1375684491] [2020-07-21 10:40:35,648 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:40:35,648 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 24 [2020-07-21 10:40:35,649 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [149337796] [2020-07-21 10:40:35,649 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 10:40:35,650 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:40:35,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 10:40:35,652 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=385, Unknown=1, NotChecked=0, Total=552 [2020-07-21 10:40:35,652 INFO L87 Difference]: Start difference. First operand 33 states and 44 transitions. Second operand 24 states. [2020-07-21 10:40:36,257 WARN L193 SmtUtils]: Spent 337.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 11 [2020-07-21 10:40:39,220 WARN L193 SmtUtils]: Spent 2.33 s on a formula simplification. DAG size of input: 46 DAG size of output: 11 [2020-07-21 10:40:41,848 WARN L193 SmtUtils]: Spent 303.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 13 [2020-07-21 10:40:44,797 WARN L193 SmtUtils]: Spent 234.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 11 [2020-07-21 10:40:57,433 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 13 [2020-07-21 10:41:19,728 WARN L193 SmtUtils]: Spent 263.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 13 [2020-07-21 10:41:22,252 WARN L193 SmtUtils]: Spent 2.22 s on a formula simplification. DAG size of input: 21 DAG size of output: 11 [2020-07-21 10:41:27,026 WARN L193 SmtUtils]: Spent 2.25 s on a formula simplification. DAG size of input: 43 DAG size of output: 13 [2020-07-21 10:41:41,598 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 13 [2020-07-21 10:41:44,652 WARN L193 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 13 [2020-07-21 10:41:47,047 WARN L193 SmtUtils]: Spent 2.21 s on a formula simplification. DAG size of input: 38 DAG size of output: 13 [2020-07-21 10:41:55,118 WARN L193 SmtUtils]: Spent 528.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 11 [2020-07-21 10:42:04,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:42:04,611 INFO L93 Difference]: Finished difference Result 115 states and 135 transitions. [2020-07-21 10:42:04,611 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-07-21 10:42:04,611 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 21 [2020-07-21 10:42:04,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:42:04,614 INFO L225 Difference]: With dead ends: 115 [2020-07-21 10:42:04,614 INFO L226 Difference]: Without dead ends: 110 [2020-07-21 10:42:04,615 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 19 SyntacticMatches, 10 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 227 ImplicationChecksByTransitivity, 56.7s TimeCoverageRelationStatistics Valid=578, Invalid=1055, Unknown=7, NotChecked=0, Total=1640 [2020-07-21 10:42:04,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-07-21 10:42:04,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 56. [2020-07-21 10:42:04,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 10:42:04,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 69 transitions. [2020-07-21 10:42:04,629 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 69 transitions. Word has length 21 [2020-07-21 10:42:04,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:42:04,629 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 69 transitions. [2020-07-21 10:42:04,629 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 10:42:04,630 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 69 transitions. [2020-07-21 10:42:04,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 10:42:04,631 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:42:04,631 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 10:42:04,831 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:42:04,832 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:42:04,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:42:04,833 INFO L82 PathProgramCache]: Analyzing trace with hash -402778255, now seen corresponding path program 1 times [2020-07-21 10:42:04,833 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:42:04,834 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1084941314] [2020-07-21 10:42:04,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 10:42:04,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:42:04,857 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 10:42:04,858 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:42:04,879 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 10:42:04,882 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 10:42:04,888 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 10:42:04,889 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 10:42:04,889 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1084941314] [2020-07-21 10:42:04,890 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 10:42:04,890 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 10:42:04,890 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [310287640] [2020-07-21 10:42:04,890 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 10:42:04,891 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:42:04,891 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 10:42:04,891 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 10:42:04,891 INFO L87 Difference]: Start difference. First operand 56 states and 69 transitions. Second operand 3 states. [2020-07-21 10:42:04,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:42:04,970 INFO L93 Difference]: Finished difference Result 83 states and 96 transitions. [2020-07-21 10:42:04,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 10:42:04,970 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 10:42:04,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:42:04,971 INFO L225 Difference]: With dead ends: 83 [2020-07-21 10:42:04,972 INFO L226 Difference]: Without dead ends: 57 [2020-07-21 10:42:04,972 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 10:42:04,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-21 10:42:04,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 55. [2020-07-21 10:42:04,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-21 10:42:04,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 57 transitions. [2020-07-21 10:42:04,979 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 57 transitions. Word has length 21 [2020-07-21 10:42:04,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:42:04,979 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 57 transitions. [2020-07-21 10:42:04,979 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 10:42:04,980 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 57 transitions. [2020-07-21 10:42:04,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 10:42:04,980 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:42:04,981 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 10:42:05,194 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:42:05,195 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:42:05,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:42:05,196 INFO L82 PathProgramCache]: Analyzing trace with hash -345519953, now seen corresponding path program 1 times [2020-07-21 10:42:05,196 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:42:05,197 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1539225550] [2020-07-21 10:42:05,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 10:42:05,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 10:42:05,219 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 10:42:05,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 10:42:05,227 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 10:42:05,241 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 10:42:05,242 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 10:42:05,454 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:42:05,478 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 10:42:05 BoogieIcfgContainer [2020-07-21 10:42:05,478 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 10:42:05,480 INFO L168 Benchmark]: Toolchain (without parser) took 94766.84 ms. Allocated memory was 137.4 MB in the beginning and 249.6 MB in the end (delta: 112.2 MB). Free memory was 101.6 MB in the beginning and 163.2 MB in the end (delta: -61.5 MB). Peak memory consumption was 50.6 MB. Max. memory is 7.1 GB. [2020-07-21 10:42:05,481 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 137.4 MB. Free memory was 120.4 MB in the beginning and 120.2 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-07-21 10:42:05,481 INFO L168 Benchmark]: CACSL2BoogieTranslator took 304.22 ms. Allocated memory is still 137.4 MB. Free memory was 101.4 MB in the beginning and 90.8 MB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2020-07-21 10:42:05,482 INFO L168 Benchmark]: Boogie Preprocessor took 109.17 ms. Allocated memory was 137.4 MB in the beginning and 200.8 MB in the end (delta: 63.4 MB). Free memory was 90.8 MB in the beginning and 178.9 MB in the end (delta: -88.0 MB). Peak memory consumption was 14.1 MB. Max. memory is 7.1 GB. [2020-07-21 10:42:05,483 INFO L168 Benchmark]: RCFGBuilder took 346.95 ms. Allocated memory is still 200.8 MB. Free memory was 178.9 MB in the beginning and 162.9 MB in the end (delta: 16.0 MB). Peak memory consumption was 16.0 MB. Max. memory is 7.1 GB. [2020-07-21 10:42:05,484 INFO L168 Benchmark]: TraceAbstraction took 94001.37 ms. Allocated memory was 200.8 MB in the beginning and 249.6 MB in the end (delta: 48.8 MB). Free memory was 162.2 MB in the beginning and 163.2 MB in the end (delta: -946.4 kB). Peak memory consumption was 47.8 MB. Max. memory is 7.1 GB. [2020-07-21 10:42:05,487 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 137.4 MB. Free memory was 120.4 MB in the beginning and 120.2 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 304.22 ms. Allocated memory is still 137.4 MB. Free memory was 101.4 MB in the beginning and 90.8 MB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 109.17 ms. Allocated memory was 137.4 MB in the beginning and 200.8 MB in the end (delta: 63.4 MB). Free memory was 90.8 MB in the beginning and 178.9 MB in the end (delta: -88.0 MB). Peak memory consumption was 14.1 MB. Max. memory is 7.1 GB. * RCFGBuilder took 346.95 ms. Allocated memory is still 200.8 MB. Free memory was 178.9 MB in the beginning and 162.9 MB in the end (delta: 16.0 MB). Peak memory consumption was 16.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 94001.37 ms. Allocated memory was 200.8 MB in the beginning and 249.6 MB in the end (delta: 48.8 MB). Free memory was 162.2 MB in the beginning and 163.2 MB in the end (delta: -946.4 kB). Peak memory consumption was 47.8 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 6]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L12] unsigned int x = 0; [L13] unsigned int y = __VERIFIER_nondet_uint(); [L15] COND TRUE x < 99 VAL [x=0, y=3] [L16] COND FALSE !(y % 2 == 0) [L17] x += 2 VAL [x=2, y=3] [L19] COND FALSE !(y % 2 == 0) [L20] x -= 2 VAL [x=0, y=3] [L22] COND FALSE !(y % 2 == 0) [L23] x += 2 VAL [x=2, y=3] [L25] COND FALSE !(y % 2 == 0) [L26] x -= 2 VAL [x=0, y=3] [L28] COND FALSE !(y % 2 == 0) [L29] x += 2 VAL [x=2, y=3] [L31] COND FALSE !(y % 2 == 0) [L32] x -= 4 VAL [x=4294967294, y=3] [L34] COND FALSE !(y % 2 == 0) [L35] x += 4 VAL [x=2, y=3] [L37] COND FALSE !(y % 2 == 0) [L38] x += 2 VAL [x=4, y=3] [L40] COND FALSE !(y % 2 == 0) [L41] x -= 4 VAL [x=0, y=3] [L43] COND FALSE !(y % 2 == 0) [L44] x -= 4 VAL [x=4294967292, y=3] [L15] COND FALSE !(x < 99) VAL [x=4294967292, y=3] [L47] CALL __VERIFIER_assert((x % 2) == (y % 2)) VAL [\old(cond)=0] [L5] COND TRUE !(cond) VAL [\old(cond)=0, cond=0] [L6] __VERIFIER_error() VAL [\old(cond)=0, cond=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 27 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 93.9s, OverallIterations: 6, TraceHistogramMax: 1, AutomataDifference: 89.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 120 SDtfs, 60 SDslu, 124 SDs, 0 SdLazy, 704 SolverSat, 426 SolverUnsat, 15 SolverUnknown, 0 SolverNotchecked, 33.8s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 126 GetRequests, 74 SyntacticMatches, 10 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 227 ImplicationChecksByTransitivity, 56.8s 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, 58 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 2.9s InterpolantComputationTime, 104 NumberOfCodeBlocks, 104 NumberOfCodeBlocksAsserted, 6 NumberOfCheckSat, 98 ConstructedInterpolants, 0 QuantifiedInterpolants, 4960 SizeOfPredicates, 4 NumberOfNonLiveVariables, 233 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...