java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/string-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-14 23:16:44,540 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-14 23:16:44,543 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-14 23:16:44,555 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-14 23:16:44,556 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-14 23:16:44,557 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-14 23:16:44,558 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-14 23:16:44,560 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-14 23:16:44,562 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-14 23:16:44,563 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-14 23:16:44,564 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-14 23:16:44,565 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-14 23:16:44,566 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-14 23:16:44,567 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-14 23:16:44,568 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-14 23:16:44,569 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-14 23:16:44,570 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-14 23:16:44,571 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-14 23:16:44,573 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-14 23:16:44,575 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-14 23:16:44,577 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-14 23:16:44,578 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-14 23:16:44,579 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-14 23:16:44,580 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-14 23:16:44,582 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-10-14 23:16:44,582 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-10-14 23:16:44,583 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-10-14 23:16:44,584 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-10-14 23:16:44,584 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-10-14 23:16:44,585 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-10-14 23:16:44,585 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-14 23:16:44,586 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-14 23:16:44,587 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-14 23:16:44,588 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-14 23:16:44,589 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-14 23:16:44,589 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-14 23:16:44,590 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-14 23:16:44,590 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-14 23:16:44,590 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-14 23:16:44,591 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-14 23:16:44,592 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-14 23:16:44,592 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 [2019-10-14 23:16:44,606 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-14 23:16:44,607 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-14 23:16:44,608 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-14 23:16:44,608 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-14 23:16:44,608 INFO L138 SettingsManager]: * Use SBE=true [2019-10-14 23:16:44,609 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-14 23:16:44,609 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-14 23:16:44,609 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-14 23:16:44,609 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-14 23:16:44,610 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-14 23:16:44,610 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-14 23:16:44,610 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-14 23:16:44,610 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-14 23:16:44,610 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-14 23:16:44,611 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-14 23:16:44,611 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-14 23:16:44,611 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-14 23:16:44,611 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-14 23:16:44,612 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-14 23:16:44,612 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-14 23:16:44,612 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-14 23:16:44,612 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-14 23:16:44,612 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-14 23:16:44,613 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-14 23:16:44,613 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-14 23:16:44,613 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-14 23:16:44,613 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-14 23:16:44,614 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-14 23:16:44,614 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-10-14 23:16:44,947 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-14 23:16:44,959 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-14 23:16:44,962 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-14 23:16:44,964 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-14 23:16:44,964 INFO L275 PluginConnector]: CDTParser initialized [2019-10-14 23:16:44,965 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/string-2.i [2019-10-14 23:16:45,039 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e190932c7/b6dc3de0cae74035bf9a2950e4e2ade7/FLAG4aa950f37 [2019-10-14 23:16:45,513 INFO L306 CDTParser]: Found 1 translation units. [2019-10-14 23:16:45,514 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/string-2.i [2019-10-14 23:16:45,520 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e190932c7/b6dc3de0cae74035bf9a2950e4e2ade7/FLAG4aa950f37 [2019-10-14 23:16:45,864 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e190932c7/b6dc3de0cae74035bf9a2950e4e2ade7 [2019-10-14 23:16:45,874 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-14 23:16:45,876 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-14 23:16:45,877 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-14 23:16:45,877 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-14 23:16:45,881 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-14 23:16:45,882 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 11:16:45" (1/1) ... [2019-10-14 23:16:45,885 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3709ac93 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:16:45, skipping insertion in model container [2019-10-14 23:16:45,885 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 11:16:45" (1/1) ... [2019-10-14 23:16:45,893 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-14 23:16:45,915 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-14 23:16:46,155 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 23:16:46,164 INFO L188 MainTranslator]: Completed pre-run [2019-10-14 23:16:46,189 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 23:16:46,309 INFO L192 MainTranslator]: Completed translation [2019-10-14 23:16:46,310 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:16:46 WrapperNode [2019-10-14 23:16:46,310 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-14 23:16:46,311 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-14 23:16:46,311 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-14 23:16:46,311 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-14 23:16:46,323 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:16:46" (1/1) ... [2019-10-14 23:16:46,324 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:16:46" (1/1) ... [2019-10-14 23:16:46,345 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:16:46" (1/1) ... [2019-10-14 23:16:46,346 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:16:46" (1/1) ... [2019-10-14 23:16:46,356 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:16:46" (1/1) ... [2019-10-14 23:16:46,363 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:16:46" (1/1) ... [2019-10-14 23:16:46,365 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:16:46" (1/1) ... [2019-10-14 23:16:46,367 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-14 23:16:46,368 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-14 23:16:46,368 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-14 23:16:46,368 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-14 23:16:46,369 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:16:46" (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 [2019-10-14 23:16:46,436 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-14 23:16:46,436 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-14 23:16:46,436 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-14 23:16:46,436 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-14 23:16:46,437 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-14 23:16:46,437 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-10-14 23:16:46,437 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-14 23:16:46,437 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2019-10-14 23:16:46,437 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-14 23:16:46,437 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-14 23:16:46,437 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-14 23:16:46,438 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-14 23:16:46,438 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-14 23:16:46,438 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-14 23:16:46,438 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-14 23:16:46,782 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-14 23:16:46,783 INFO L284 CfgBuilder]: Removed 5 assume(true) statements. [2019-10-14 23:16:46,784 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 11:16:46 BoogieIcfgContainer [2019-10-14 23:16:46,784 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-14 23:16:46,785 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-14 23:16:46,786 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-14 23:16:46,789 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-14 23:16:46,789 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.10 11:16:45" (1/3) ... [2019-10-14 23:16:46,790 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@37df905a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 11:16:46, skipping insertion in model container [2019-10-14 23:16:46,790 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:16:46" (2/3) ... [2019-10-14 23:16:46,790 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@37df905a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 11:16:46, skipping insertion in model container [2019-10-14 23:16:46,791 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 11:16:46" (3/3) ... [2019-10-14 23:16:46,793 INFO L109 eAbstractionObserver]: Analyzing ICFG string-2.i [2019-10-14 23:16:46,806 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-14 23:16:46,819 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-14 23:16:46,832 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-14 23:16:46,864 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-14 23:16:46,865 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-14 23:16:46,865 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-14 23:16:46,865 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-14 23:16:46,865 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-14 23:16:46,865 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-14 23:16:46,865 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-14 23:16:46,865 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-14 23:16:46,881 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states. [2019-10-14 23:16:46,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-10-14 23:16:46,887 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:16:46,888 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:16:46,890 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:16:46,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:16:46,896 INFO L82 PathProgramCache]: Analyzing trace with hash -99599224, now seen corresponding path program 1 times [2019-10-14 23:16:46,902 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:16:46,903 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1644506989] [2019-10-14 23:16:46,903 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:16:46,903 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:16:46,903 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:16:46,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:16:47,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:16:47,070 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:16:47,071 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1644506989] [2019-10-14 23:16:47,072 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 23:16:47,072 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-14 23:16:47,072 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1788408670] [2019-10-14 23:16:47,077 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-14 23:16:47,078 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:16:47,093 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-14 23:16:47,094 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-14 23:16:47,096 INFO L87 Difference]: Start difference. First operand 35 states. Second operand 3 states. [2019-10-14 23:16:47,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:16:47,242 INFO L93 Difference]: Finished difference Result 62 states and 89 transitions. [2019-10-14 23:16:47,242 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-14 23:16:47,245 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2019-10-14 23:16:47,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:16:47,254 INFO L225 Difference]: With dead ends: 62 [2019-10-14 23:16:47,254 INFO L226 Difference]: Without dead ends: 28 [2019-10-14 23:16:47,258 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-14 23:16:47,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-10-14 23:16:47,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2019-10-14 23:16:47,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-10-14 23:16:47,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 33 transitions. [2019-10-14 23:16:47,299 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 33 transitions. Word has length 22 [2019-10-14 23:16:47,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:16:47,300 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 33 transitions. [2019-10-14 23:16:47,300 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-14 23:16:47,301 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 33 transitions. [2019-10-14 23:16:47,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-10-14 23:16:47,302 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:16:47,302 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:16:47,302 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:16:47,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:16:47,303 INFO L82 PathProgramCache]: Analyzing trace with hash 930552028, now seen corresponding path program 1 times [2019-10-14 23:16:47,303 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:16:47,304 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1485193332] [2019-10-14 23:16:47,304 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:16:47,304 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:16:47,304 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:16:47,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:16:47,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:16:47,395 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:16:47,396 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1485193332] [2019-10-14 23:16:47,396 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 23:16:47,396 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-14 23:16:47,397 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1101195134] [2019-10-14 23:16:47,398 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-14 23:16:47,399 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:16:47,399 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-14 23:16:47,400 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 23:16:47,400 INFO L87 Difference]: Start difference. First operand 28 states and 33 transitions. Second operand 4 states. [2019-10-14 23:16:47,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:16:47,521 INFO L93 Difference]: Finished difference Result 56 states and 69 transitions. [2019-10-14 23:16:47,521 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-14 23:16:47,521 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 24 [2019-10-14 23:16:47,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:16:47,525 INFO L225 Difference]: With dead ends: 56 [2019-10-14 23:16:47,525 INFO L226 Difference]: Without dead ends: 36 [2019-10-14 23:16:47,526 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 23:16:47,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2019-10-14 23:16:47,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 30. [2019-10-14 23:16:47,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2019-10-14 23:16:47,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 35 transitions. [2019-10-14 23:16:47,536 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 35 transitions. Word has length 24 [2019-10-14 23:16:47,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:16:47,536 INFO L462 AbstractCegarLoop]: Abstraction has 30 states and 35 transitions. [2019-10-14 23:16:47,536 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-14 23:16:47,537 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 35 transitions. [2019-10-14 23:16:47,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-10-14 23:16:47,538 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:16:47,538 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:16:47,538 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:16:47,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:16:47,539 INFO L82 PathProgramCache]: Analyzing trace with hash 1358146588, now seen corresponding path program 1 times [2019-10-14 23:16:47,539 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:16:47,539 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [394793316] [2019-10-14 23:16:47,539 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:16:47,540 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:16:47,540 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:16:47,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:16:47,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:16:47,680 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-14 23:16:47,681 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [394793316] [2019-10-14 23:16:47,681 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [837570984] [2019-10-14 23:16:47,681 INFO L94 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 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:16:47,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:16:47,757 INFO L256 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-14 23:16:47,764 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:16:47,800 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-14 23:16:47,801 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:16:47,801 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2019-10-14 23:16:47,802 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [742639753] [2019-10-14 23:16:47,802 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-14 23:16:47,803 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:16:47,803 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-14 23:16:47,803 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-14 23:16:47,804 INFO L87 Difference]: Start difference. First operand 30 states and 35 transitions. Second operand 6 states. [2019-10-14 23:16:47,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:16:47,945 INFO L93 Difference]: Finished difference Result 65 states and 80 transitions. [2019-10-14 23:16:47,946 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-10-14 23:16:47,946 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 28 [2019-10-14 23:16:47,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:16:47,947 INFO L225 Difference]: With dead ends: 65 [2019-10-14 23:16:47,948 INFO L226 Difference]: Without dead ends: 44 [2019-10-14 23:16:47,948 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-14 23:16:47,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2019-10-14 23:16:47,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 34. [2019-10-14 23:16:47,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-10-14 23:16:47,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 39 transitions. [2019-10-14 23:16:47,956 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 39 transitions. Word has length 28 [2019-10-14 23:16:47,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:16:47,956 INFO L462 AbstractCegarLoop]: Abstraction has 34 states and 39 transitions. [2019-10-14 23:16:47,957 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-14 23:16:47,957 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 39 transitions. [2019-10-14 23:16:47,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-10-14 23:16:47,958 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:16:47,958 INFO L380 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, 1, 1, 1, 1, 1] [2019-10-14 23:16:48,168 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:16:48,168 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:16:48,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:16:48,169 INFO L82 PathProgramCache]: Analyzing trace with hash -1752396196, now seen corresponding path program 2 times [2019-10-14 23:16:48,170 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:16:48,170 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1765241537] [2019-10-14 23:16:48,171 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:16:48,171 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:16:48,171 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:16:48,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:16:48,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:16:48,294 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-14 23:16:48,295 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1765241537] [2019-10-14 23:16:48,295 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [277652619] [2019-10-14 23:16:48,295 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:16:48,342 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 23:16:48,342 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:16:48,343 INFO L256 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-14 23:16:48,345 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:16:48,361 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-14 23:16:48,361 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:16:48,361 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2019-10-14 23:16:48,362 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [450973987] [2019-10-14 23:16:48,362 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-14 23:16:48,363 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:16:48,363 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-14 23:16:48,363 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-14 23:16:48,363 INFO L87 Difference]: Start difference. First operand 34 states and 39 transitions. Second operand 7 states. [2019-10-14 23:16:48,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:16:48,482 INFO L93 Difference]: Finished difference Result 75 states and 92 transitions. [2019-10-14 23:16:48,484 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-14 23:16:48,484 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 32 [2019-10-14 23:16:48,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:16:48,487 INFO L225 Difference]: With dead ends: 75 [2019-10-14 23:16:48,487 INFO L226 Difference]: Without dead ends: 52 [2019-10-14 23:16:48,488 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-14 23:16:48,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2019-10-14 23:16:48,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 38. [2019-10-14 23:16:48,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2019-10-14 23:16:48,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 43 transitions. [2019-10-14 23:16:48,499 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 43 transitions. Word has length 32 [2019-10-14 23:16:48,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:16:48,504 INFO L462 AbstractCegarLoop]: Abstraction has 38 states and 43 transitions. [2019-10-14 23:16:48,504 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-14 23:16:48,504 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 43 transitions. [2019-10-14 23:16:48,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2019-10-14 23:16:48,506 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:16:48,506 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:16:48,717 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:16:48,718 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:16:48,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:16:48,719 INFO L82 PathProgramCache]: Analyzing trace with hash -800948324, now seen corresponding path program 3 times [2019-10-14 23:16:48,721 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:16:48,723 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1361802009] [2019-10-14 23:16:48,724 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:16:48,724 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:16:48,724 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:16:48,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:16:48,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:16:48,856 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-10-14 23:16:48,856 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1361802009] [2019-10-14 23:16:48,858 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1891468170] [2019-10-14 23:16:48,858 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:16:48,915 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-10-14 23:16:48,915 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:16:48,917 INFO L256 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 5 conjunts are in the unsatisfiable core [2019-10-14 23:16:48,919 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:16:48,937 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-10-14 23:16:48,937 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:16:48,938 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2019-10-14 23:16:48,938 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [858453212] [2019-10-14 23:16:48,938 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-10-14 23:16:48,940 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:16:48,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-10-14 23:16:48,940 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-10-14 23:16:48,940 INFO L87 Difference]: Start difference. First operand 38 states and 43 transitions. Second operand 8 states. [2019-10-14 23:16:49,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:16:49,086 INFO L93 Difference]: Finished difference Result 85 states and 104 transitions. [2019-10-14 23:16:49,086 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-14 23:16:49,086 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 36 [2019-10-14 23:16:49,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:16:49,088 INFO L225 Difference]: With dead ends: 85 [2019-10-14 23:16:49,088 INFO L226 Difference]: Without dead ends: 60 [2019-10-14 23:16:49,089 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-10-14 23:16:49,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2019-10-14 23:16:49,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 42. [2019-10-14 23:16:49,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2019-10-14 23:16:49,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 47 transitions. [2019-10-14 23:16:49,096 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 47 transitions. Word has length 36 [2019-10-14 23:16:49,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:16:49,097 INFO L462 AbstractCegarLoop]: Abstraction has 42 states and 47 transitions. [2019-10-14 23:16:49,097 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-10-14 23:16:49,097 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 47 transitions. [2019-10-14 23:16:49,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2019-10-14 23:16:49,098 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:16:49,099 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:16:49,303 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:16:49,303 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:16:49,304 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:16:49,304 INFO L82 PathProgramCache]: Analyzing trace with hash 1655062492, now seen corresponding path program 4 times [2019-10-14 23:16:49,304 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:16:49,304 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [958972114] [2019-10-14 23:16:49,304 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:16:49,305 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:16:49,305 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:16:49,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:16:49,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:16:49,440 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-14 23:16:49,440 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [958972114] [2019-10-14 23:16:49,441 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1090576166] [2019-10-14 23:16:49,441 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:16:49,498 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 23:16:49,499 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:16:49,500 INFO L256 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-14 23:16:49,503 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:16:49,518 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-14 23:16:49,519 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 23:16:49,519 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2019-10-14 23:16:49,519 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1436360796] [2019-10-14 23:16:49,520 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-14 23:16:49,521 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:16:49,521 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-14 23:16:49,521 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-10-14 23:16:49,521 INFO L87 Difference]: Start difference. First operand 42 states and 47 transitions. Second operand 9 states. [2019-10-14 23:16:49,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:16:49,669 INFO L93 Difference]: Finished difference Result 93 states and 114 transitions. [2019-10-14 23:16:49,670 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-10-14 23:16:49,670 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 40 [2019-10-14 23:16:49,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:16:49,671 INFO L225 Difference]: With dead ends: 93 [2019-10-14 23:16:49,672 INFO L226 Difference]: Without dead ends: 66 [2019-10-14 23:16:49,672 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-10-14 23:16:49,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2019-10-14 23:16:49,678 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 46. [2019-10-14 23:16:49,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2019-10-14 23:16:49,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2019-10-14 23:16:49,680 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 40 [2019-10-14 23:16:49,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:16:49,680 INFO L462 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2019-10-14 23:16:49,681 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-14 23:16:49,681 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2019-10-14 23:16:49,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2019-10-14 23:16:49,682 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:16:49,682 INFO L380 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:16:49,887 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:16:49,887 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:16:49,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:16:49,888 INFO L82 PathProgramCache]: Analyzing trace with hash 349736732, now seen corresponding path program 5 times [2019-10-14 23:16:49,888 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:16:49,889 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [975407797] [2019-10-14 23:16:49,889 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:16:49,890 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:16:49,890 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:16:49,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-10-14 23:16:49,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-10-14 23:16:49,994 INFO L168 tionRefinementEngine]: Strategy CAMEL found a feasible trace [2019-10-14 23:16:49,994 INFO L445 BasicCegarLoop]: Counterexample might be feasible [2019-10-14 23:16:50,037 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 14.10 11:16:50 BoogieIcfgContainer [2019-10-14 23:16:50,039 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-10-14 23:16:50,042 INFO L168 Benchmark]: Toolchain (without parser) took 4165.49 ms. Allocated memory was 142.6 MB in the beginning and 251.1 MB in the end (delta: 108.5 MB). Free memory was 100.6 MB in the beginning and 215.1 MB in the end (delta: -114.6 MB). There was no memory consumed. Max. memory is 7.1 GB. [2019-10-14 23:16:50,043 INFO L168 Benchmark]: CDTParser took 0.25 ms. Allocated memory is still 142.6 MB. Free memory was 118.9 MB in the beginning and 118.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2019-10-14 23:16:50,044 INFO L168 Benchmark]: CACSL2BoogieTranslator took 433.76 ms. Allocated memory was 142.6 MB in the beginning and 199.2 MB in the end (delta: 56.6 MB). Free memory was 100.4 MB in the beginning and 178.4 MB in the end (delta: -78.0 MB). Peak memory consumption was 20.0 MB. Max. memory is 7.1 GB. [2019-10-14 23:16:50,045 INFO L168 Benchmark]: Boogie Preprocessor took 56.83 ms. Allocated memory is still 199.2 MB. Free memory was 178.4 MB in the beginning and 175.8 MB in the end (delta: 2.5 MB). Peak memory consumption was 2.5 MB. Max. memory is 7.1 GB. [2019-10-14 23:16:50,046 INFO L168 Benchmark]: RCFGBuilder took 416.32 ms. Allocated memory is still 199.2 MB. Free memory was 175.8 MB in the beginning and 157.6 MB in the end (delta: 18.2 MB). Peak memory consumption was 18.2 MB. Max. memory is 7.1 GB. [2019-10-14 23:16:50,046 INFO L168 Benchmark]: TraceAbstraction took 3254.02 ms. Allocated memory was 199.2 MB in the beginning and 251.1 MB in the end (delta: 51.9 MB). Free memory was 156.9 MB in the beginning and 215.1 MB in the end (delta: -58.2 MB). There was no memory consumed. Max. memory is 7.1 GB. [2019-10-14 23:16:50,050 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 ms. Allocated memory is still 142.6 MB. Free memory was 118.9 MB in the beginning and 118.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 433.76 ms. Allocated memory was 142.6 MB in the beginning and 199.2 MB in the end (delta: 56.6 MB). Free memory was 100.4 MB in the beginning and 178.4 MB in the end (delta: -78.0 MB). Peak memory consumption was 20.0 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 56.83 ms. Allocated memory is still 199.2 MB. Free memory was 178.4 MB in the beginning and 175.8 MB in the end (delta: 2.5 MB). Peak memory consumption was 2.5 MB. Max. memory is 7.1 GB. * RCFGBuilder took 416.32 ms. Allocated memory is still 199.2 MB. Free memory was 175.8 MB in the beginning and 157.6 MB in the end (delta: 18.2 MB). Peak memory consumption was 18.2 MB. Max. memory is 7.1 GB. * TraceAbstraction took 3254.02 ms. Allocated memory was 199.2 MB in the beginning and 251.1 MB in the end (delta: 51.9 MB). Free memory was 156.9 MB in the beginning and 215.1 MB in the end (delta: -58.2 MB). There was no memory consumed. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 6]: Unable to prove that call of __VERIFIER_error() unreachable Unable to prove that call of __VERIFIER_error() unreachable Reason: overapproximation of shiftLeft at line 55. Possible FailurePath: [L17] char string_A[5], string_B[5]; [L18] int i, j, nc_A, nc_B, found=0; [L21] i=0 VAL [found=0, i=0, string_A={1:0}, string_B={-1:0}] [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ VAL [found=0, i=1, string_A={1:0}, string_B={-1:0}] [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ VAL [found=0, i=2, string_A={1:0}, string_B={-1:0}] [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ VAL [found=0, i=3, string_A={1:0}, string_B={-1:0}] [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ VAL [found=0, i=4, string_A={1:0}, string_B={-1:0}] [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ VAL [found=0, i=5, string_A={1:0}, string_B={-1:0}] [L21] COND FALSE !(i<5) VAL [found=0, i=5, string_A={1:0}, string_B={-1:0}] [L23] EXPR string_A[5 -1] VAL [found=0, i=5, string_A={1:0}, string_A[5 -1]=0, string_B={-1:0}] [L23] COND FALSE !(!(string_A[5 -1]=='\0')) [L25] i=0 VAL [found=0, i=0, string_A={1:0}, string_B={-1:0}] [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ VAL [found=0, i=1, string_A={1:0}, string_B={-1:0}] [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ VAL [found=0, i=2, string_A={1:0}, string_B={-1:0}] [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ VAL [found=0, i=3, string_A={1:0}, string_B={-1:0}] [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ VAL [found=0, i=4, string_A={1:0}, string_B={-1:0}] [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ VAL [found=0, i=5, string_A={1:0}, string_B={-1:0}] [L25] COND FALSE !(i<5) VAL [found=0, i=5, string_A={1:0}, string_B={-1:0}] [L27] EXPR string_B[5 -1] VAL [found=0, i=5, string_A={1:0}, string_B={-1:0}, string_B[5 -1]=0] [L27] COND FALSE !(!(string_B[5 -1]=='\0')) [L29] nc_A = 0 VAL [found=0, i=5, nc_A=0, string_A={1:0}, string_B={-1:0}] [L30] EXPR string_A[nc_A] VAL [found=0, i=5, nc_A=0, string_A={1:0}, string_A[nc_A]=0, string_B={-1:0}] [L30] COND FALSE !(string_A[nc_A]!='\0') [L33] nc_B = 0 VAL [found=0, i=5, nc_A=0, nc_B=0, string_A={1:0}, string_B={-1:0}] [L34] EXPR string_B[nc_B] VAL [found=0, i=5, nc_A=0, nc_B=0, string_A={1:0}, string_B={-1:0}, string_B[nc_B]=0] [L34] COND FALSE !(string_B[nc_B]!='\0') [L37] COND FALSE !(!(nc_B >= nc_A)) [L40] EXPR j=0 [L40] i=j=0 VAL [found=0, i=0, j=0, nc_A=0, nc_B=0, string_A={1:0}, string_B={-1:0}] [L41] COND FALSE !((inc_B-1)<