/usr/bin/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 0.1.25-72570d3 [2020-08-22 16:57:04,357 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 16:57:04,360 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 16:57:04,401 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-22 16:57:04,401 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-22 16:57:04,409 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-22 16:57:04,412 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-22 16:57:04,416 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-22 16:57:04,418 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-22 16:57:04,421 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-22 16:57:04,422 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-22 16:57:04,423 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-22 16:57:04,423 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 16:57:04,426 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 16:57:04,428 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 16:57:04,430 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 16:57:04,431 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 16:57:04,432 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 16:57:04,434 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 16:57:04,442 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 16:57:04,444 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 16:57:04,445 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 16:57:04,446 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 16:57:04,446 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 16:57:04,458 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-22 16:57:04,475 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 16:57:04,476 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 16:57:04,477 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 16:57:04,478 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 [2020-08-22 16:57:04,501 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 16:57:04,501 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 16:57:04,503 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-22 16:57:04,503 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-22 16:57:04,503 INFO L138 SettingsManager]: * Use SBE=true [2020-08-22 16:57:04,503 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 16:57:04,503 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 16:57:04,504 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 16:57:04,504 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 16:57:04,504 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 16:57:04,504 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 16:57:04,504 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 16:57:04,505 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 16:57:04,505 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 16:57:04,505 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 16:57:04,505 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 16:57:04,505 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 16:57:04,505 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 16:57:04,506 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-22 16:57:04,506 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 16:57:04,506 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 16:57:04,506 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 16:57:04,506 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 16:57:04,507 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-22 16:57:04,507 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-22 16:57:04,507 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-22 16:57:04,507 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-22 16:57:04,507 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 16:57:04,508 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-22 16:57:04,508 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-08-22 16:57:04,822 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 16:57:04,842 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 16:57:04,847 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 16:57:04,849 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 16:57:04,849 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 16:57:04,849 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/string-2.i [2020-08-22 16:57:04,914 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/07d06bbae/46b5c3d330d54b79a92a13ba4d0d1987/FLAG3afa0aaa4 [2020-08-22 16:57:05,304 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 16:57:05,305 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/string-2.i [2020-08-22 16:57:05,312 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/07d06bbae/46b5c3d330d54b79a92a13ba4d0d1987/FLAG3afa0aaa4 [2020-08-22 16:57:05,668 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/07d06bbae/46b5c3d330d54b79a92a13ba4d0d1987 [2020-08-22 16:57:05,676 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 16:57:05,678 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 16:57:05,679 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 16:57:05,679 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 16:57:05,682 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 16:57:05,683 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 04:57:05" (1/1) ... [2020-08-22 16:57:05,686 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@53b7ec73 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:57:05, skipping insertion in model container [2020-08-22 16:57:05,686 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 04:57:05" (1/1) ... [2020-08-22 16:57:05,694 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 16:57:05,712 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 16:57:05,890 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 16:57:05,894 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 16:57:05,922 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 16:57:05,943 INFO L208 MainTranslator]: Completed translation [2020-08-22 16:57:05,944 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:57:05 WrapperNode [2020-08-22 16:57:05,944 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 16:57:05,945 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 16:57:05,945 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 16:57:05,945 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 16:57:06,074 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:57:05" (1/1) ... [2020-08-22 16:57:06,074 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:57:05" (1/1) ... [2020-08-22 16:57:06,094 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:57:05" (1/1) ... [2020-08-22 16:57:06,094 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:57:05" (1/1) ... [2020-08-22 16:57:06,121 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:57:05" (1/1) ... [2020-08-22 16:57:06,135 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:57:05" (1/1) ... [2020-08-22 16:57:06,139 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:57:05" (1/1) ... [2020-08-22 16:57:06,147 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 16:57:06,148 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 16:57:06,148 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 16:57:06,148 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 16:57:06,153 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:57:05" (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 [2020-08-22 16:57:06,231 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 16:57:06,231 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 16:57:06,231 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-22 16:57:06,232 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-22 16:57:06,233 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 16:57:06,233 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 16:57:06,235 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-22 16:57:06,235 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-22 16:57:06,235 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-22 16:57:06,235 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-08-22 16:57:06,235 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 16:57:06,236 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-22 16:57:06,236 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-22 16:57:06,237 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-22 16:57:06,237 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-22 16:57:06,240 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 16:57:06,240 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 16:57:06,703 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 16:57:06,703 INFO L295 CfgBuilder]: Removed 5 assume(true) statements. [2020-08-22 16:57:06,707 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 04:57:06 BoogieIcfgContainer [2020-08-22 16:57:06,707 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 16:57:06,708 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 16:57:06,708 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 16:57:06,711 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 16:57:06,712 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 04:57:05" (1/3) ... [2020-08-22 16:57:06,713 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@70582c2b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 04:57:06, skipping insertion in model container [2020-08-22 16:57:06,713 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:57:05" (2/3) ... [2020-08-22 16:57:06,713 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@70582c2b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 04:57:06, skipping insertion in model container [2020-08-22 16:57:06,713 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 04:57:06" (3/3) ... [2020-08-22 16:57:06,715 INFO L109 eAbstractionObserver]: Analyzing ICFG string-2.i [2020-08-22 16:57:06,726 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-08-22 16:57:06,734 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 16:57:06,748 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 16:57:06,773 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 16:57:06,773 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 16:57:06,773 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-08-22 16:57:06,774 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 16:57:06,774 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 16:57:06,774 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 16:57:06,774 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 16:57:06,774 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 16:57:06,790 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states. [2020-08-22 16:57:06,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-22 16:57:06,795 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:57:06,796 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, 1] [2020-08-22 16:57:06,797 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:57:06,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:57:06,801 INFO L82 PathProgramCache]: Analyzing trace with hash -522531256, now seen corresponding path program 1 times [2020-08-22 16:57:06,810 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:57:06,810 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2144510257] [2020-08-22 16:57:06,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:57:06,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:07,006 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:57:07,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:07,020 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:57:07,021 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2144510257] [2020-08-22 16:57:07,022 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 16:57:07,022 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-22 16:57:07,023 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1173317077] [2020-08-22 16:57:07,028 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-22 16:57:07,029 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:57:07,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-22 16:57:07,040 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-22 16:57:07,041 INFO L87 Difference]: Start difference. First operand 35 states. Second operand 4 states. [2020-08-22 16:57:07,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:57:07,288 INFO L93 Difference]: Finished difference Result 73 states and 109 transitions. [2020-08-22 16:57:07,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-22 16:57:07,292 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 22 [2020-08-22 16:57:07,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:57:07,315 INFO L225 Difference]: With dead ends: 73 [2020-08-22 16:57:07,315 INFO L226 Difference]: Without dead ends: 36 [2020-08-22 16:57:07,328 INFO L675 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 [2020-08-22 16:57:07,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-22 16:57:07,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 30. [2020-08-22 16:57:07,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-22 16:57:07,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 35 transitions. [2020-08-22 16:57:07,380 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 35 transitions. Word has length 22 [2020-08-22 16:57:07,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:57:07,381 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 35 transitions. [2020-08-22 16:57:07,381 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-22 16:57:07,382 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 35 transitions. [2020-08-22 16:57:07,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-22 16:57:07,383 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:57:07,383 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, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:57:07,384 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 16:57:07,384 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:57:07,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:57:07,384 INFO L82 PathProgramCache]: Analyzing trace with hash -1816798436, now seen corresponding path program 1 times [2020-08-22 16:57:07,385 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:57:07,385 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1748463647] [2020-08-22 16:57:07,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:57:07,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:07,464 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:57:07,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:07,474 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-22 16:57:07,474 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1748463647] [2020-08-22 16:57:07,475 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1563384045] [2020-08-22 16:57:07,475 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 -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 [2020-08-22 16:57:07,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:07,548 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 3 conjunts are in the unsatisfiable core [2020-08-22 16:57:07,555 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:57:07,615 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-22 16:57:07,616 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:57:07,616 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2020-08-22 16:57:07,618 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [525440593] [2020-08-22 16:57:07,618 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-22 16:57:07,619 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:57:07,619 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-22 16:57:07,620 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-22 16:57:07,620 INFO L87 Difference]: Start difference. First operand 30 states and 35 transitions. Second operand 6 states. [2020-08-22 16:57:07,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:57:07,833 INFO L93 Difference]: Finished difference Result 65 states and 80 transitions. [2020-08-22 16:57:07,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 16:57:07,834 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 28 [2020-08-22 16:57:07,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:57:07,835 INFO L225 Difference]: With dead ends: 65 [2020-08-22 16:57:07,836 INFO L226 Difference]: Without dead ends: 44 [2020-08-22 16:57:07,837 INFO L675 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 [2020-08-22 16:57:07,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-22 16:57:07,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 34. [2020-08-22 16:57:07,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-22 16:57:07,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 39 transitions. [2020-08-22 16:57:07,846 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 39 transitions. Word has length 28 [2020-08-22 16:57:07,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:57:07,847 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 39 transitions. [2020-08-22 16:57:07,847 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-22 16:57:07,847 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 39 transitions. [2020-08-22 16:57:07,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-22 16:57:07,848 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:57:07,849 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:57:08,063 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-08-22 16:57:08,064 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:57:08,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:57:08,076 INFO L82 PathProgramCache]: Analyzing trace with hash 1067646812, now seen corresponding path program 2 times [2020-08-22 16:57:08,077 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:57:08,077 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [847763262] [2020-08-22 16:57:08,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:57:08,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:08,161 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:57:08,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:08,168 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-08-22 16:57:08,168 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [847763262] [2020-08-22 16:57:08,169 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1274549944] [2020-08-22 16:57:08,169 INFO L93 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 [2020-08-22 16:57:08,220 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-08-22 16:57:08,220 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-08-22 16:57:08,221 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 4 conjunts are in the unsatisfiable core [2020-08-22 16:57:08,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:57:08,264 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-08-22 16:57:08,264 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:57:08,265 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2020-08-22 16:57:08,265 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1604960630] [2020-08-22 16:57:08,265 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-22 16:57:08,266 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:57:08,266 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-22 16:57:08,266 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-22 16:57:08,267 INFO L87 Difference]: Start difference. First operand 34 states and 39 transitions. Second operand 7 states. [2020-08-22 16:57:08,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:57:08,414 INFO L93 Difference]: Finished difference Result 75 states and 92 transitions. [2020-08-22 16:57:08,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-22 16:57:08,415 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 32 [2020-08-22 16:57:08,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:57:08,416 INFO L225 Difference]: With dead ends: 75 [2020-08-22 16:57:08,417 INFO L226 Difference]: Without dead ends: 52 [2020-08-22 16:57:08,417 INFO L675 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 [2020-08-22 16:57:08,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-22 16:57:08,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 38. [2020-08-22 16:57:08,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-22 16:57:08,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 43 transitions. [2020-08-22 16:57:08,425 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 43 transitions. Word has length 32 [2020-08-22 16:57:08,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:57:08,426 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 43 transitions. [2020-08-22 16:57:08,426 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-22 16:57:08,426 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 43 transitions. [2020-08-22 16:57:08,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-22 16:57:08,428 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:57:08,428 INFO L422 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] [2020-08-22 16:57:08,641 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:57:08,642 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:57:08,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:57:08,642 INFO L82 PathProgramCache]: Analyzing trace with hash -1245957476, now seen corresponding path program 3 times [2020-08-22 16:57:08,643 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:57:08,643 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1008173604] [2020-08-22 16:57:08,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:57:08,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:08,740 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:57:08,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:08,752 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-08-22 16:57:08,753 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1008173604] [2020-08-22 16:57:08,753 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [125244006] [2020-08-22 16:57:08,753 INFO L93 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 [2020-08-22 16:57:08,830 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2020-08-22 16:57:08,830 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-08-22 16:57:08,831 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 5 conjunts are in the unsatisfiable core [2020-08-22 16:57:08,835 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:57:08,872 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-08-22 16:57:08,873 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:57:08,873 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2020-08-22 16:57:08,873 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1875662508] [2020-08-22 16:57:08,874 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-22 16:57:08,874 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:57:08,874 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-22 16:57:08,875 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-22 16:57:08,875 INFO L87 Difference]: Start difference. First operand 38 states and 43 transitions. Second operand 8 states. [2020-08-22 16:57:09,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:57:09,007 INFO L93 Difference]: Finished difference Result 85 states and 104 transitions. [2020-08-22 16:57:09,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-22 16:57:09,008 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 36 [2020-08-22 16:57:09,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:57:09,009 INFO L225 Difference]: With dead ends: 85 [2020-08-22 16:57:09,009 INFO L226 Difference]: Without dead ends: 60 [2020-08-22 16:57:09,010 INFO L675 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 [2020-08-22 16:57:09,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-22 16:57:09,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 42. [2020-08-22 16:57:09,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-22 16:57:09,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 47 transitions. [2020-08-22 16:57:09,017 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 47 transitions. Word has length 36 [2020-08-22 16:57:09,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:57:09,018 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 47 transitions. [2020-08-22 16:57:09,018 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-22 16:57:09,018 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 47 transitions. [2020-08-22 16:57:09,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-22 16:57:09,019 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:57:09,019 INFO L422 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] [2020-08-22 16:57:09,235 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:57:09,235 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:57:09,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:57:09,236 INFO L82 PathProgramCache]: Analyzing trace with hash -1106103076, now seen corresponding path program 4 times [2020-08-22 16:57:09,236 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:57:09,236 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1965631696] [2020-08-22 16:57:09,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:57:09,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:09,315 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:57:09,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:09,321 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-08-22 16:57:09,322 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1965631696] [2020-08-22 16:57:09,322 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1751959319] [2020-08-22 16:57:09,323 INFO L93 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 [2020-08-22 16:57:09,368 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-08-22 16:57:09,369 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-08-22 16:57:09,370 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 6 conjunts are in the unsatisfiable core [2020-08-22 16:57:09,372 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:57:09,401 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-08-22 16:57:09,402 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:57:09,402 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2020-08-22 16:57:09,402 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1530241450] [2020-08-22 16:57:09,403 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-22 16:57:09,403 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:57:09,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-22 16:57:09,404 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-22 16:57:09,404 INFO L87 Difference]: Start difference. First operand 42 states and 47 transitions. Second operand 9 states. [2020-08-22 16:57:09,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:57:09,568 INFO L93 Difference]: Finished difference Result 93 states and 114 transitions. [2020-08-22 16:57:09,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-22 16:57:09,570 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 40 [2020-08-22 16:57:09,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:57:09,571 INFO L225 Difference]: With dead ends: 93 [2020-08-22 16:57:09,571 INFO L226 Difference]: Without dead ends: 66 [2020-08-22 16:57:09,572 INFO L675 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 [2020-08-22 16:57:09,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-22 16:57:09,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 46. [2020-08-22 16:57:09,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-22 16:57:09,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2020-08-22 16:57:09,586 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 40 [2020-08-22 16:57:09,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:57:09,586 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2020-08-22 16:57:09,586 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-22 16:57:09,586 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2020-08-22 16:57:09,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-22 16:57:09,589 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:57:09,589 INFO L422 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] [2020-08-22 16:57:09,806 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:57:09,807 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:57:09,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:57:09,807 INFO L82 PathProgramCache]: Analyzing trace with hash 1061537308, now seen corresponding path program 5 times [2020-08-22 16:57:09,808 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:57:09,808 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1334256874] [2020-08-22 16:57:09,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:57:09,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 16:57:09,874 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-08-22 16:57:09,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 16:57:09,909 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-08-22 16:57:09,940 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-08-22 16:57:09,940 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-22 16:57:09,941 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-22 16:57:09,986 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.08 04:57:09 BoogieIcfgContainer [2020-08-22 16:57:09,986 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-22 16:57:09,989 INFO L168 Benchmark]: Toolchain (without parser) took 4310.57 ms. Allocated memory was 141.0 MB in the beginning and 241.2 MB in the end (delta: 100.1 MB). Free memory was 104.1 MB in the beginning and 193.0 MB in the end (delta: -88.9 MB). Peak memory consumption was 11.3 MB. Max. memory is 7.1 GB. [2020-08-22 16:57:09,990 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 141.0 MB. Free memory was 122.5 MB in the beginning and 122.3 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. [2020-08-22 16:57:09,991 INFO L168 Benchmark]: CACSL2BoogieTranslator took 265.48 ms. Allocated memory is still 141.0 MB. Free memory was 103.9 MB in the beginning and 93.1 MB in the end (delta: 10.8 MB). Peak memory consumption was 10.8 MB. Max. memory is 7.1 GB. [2020-08-22 16:57:09,992 INFO L168 Benchmark]: Boogie Preprocessor took 203.09 ms. Allocated memory was 141.0 MB in the beginning and 206.6 MB in the end (delta: 65.5 MB). Free memory was 93.1 MB in the beginning and 183.8 MB in the end (delta: -90.8 MB). Peak memory consumption was 12.8 MB. Max. memory is 7.1 GB. [2020-08-22 16:57:09,993 INFO L168 Benchmark]: RCFGBuilder took 558.98 ms. Allocated memory is still 206.6 MB. Free memory was 183.8 MB in the beginning and 164.6 MB in the end (delta: 19.3 MB). Peak memory consumption was 19.3 MB. Max. memory is 7.1 GB. [2020-08-22 16:57:09,994 INFO L168 Benchmark]: TraceAbstraction took 3278.33 ms. Allocated memory was 206.6 MB in the beginning and 241.2 MB in the end (delta: 34.6 MB). Free memory was 163.9 MB in the beginning and 193.0 MB in the end (delta: -29.1 MB). Peak memory consumption was 5.5 MB. Max. memory is 7.1 GB. [2020-08-22 16:57:09,998 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 141.0 MB. Free memory was 122.5 MB in the beginning and 122.3 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 265.48 ms. Allocated memory is still 141.0 MB. Free memory was 103.9 MB in the beginning and 93.1 MB in the end (delta: 10.8 MB). Peak memory consumption was 10.8 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 203.09 ms. Allocated memory was 141.0 MB in the beginning and 206.6 MB in the end (delta: 65.5 MB). Free memory was 93.1 MB in the beginning and 183.8 MB in the end (delta: -90.8 MB). Peak memory consumption was 12.8 MB. Max. memory is 7.1 GB. * RCFGBuilder took 558.98 ms. Allocated memory is still 206.6 MB. Free memory was 183.8 MB in the beginning and 164.6 MB in the end (delta: 19.3 MB). Peak memory consumption was 19.3 MB. Max. memory is 7.1 GB. * TraceAbstraction took 3278.33 ms. Allocated memory was 206.6 MB in the beginning and 241.2 MB in the end (delta: 34.6 MB). Free memory was 163.9 MB in the beginning and 193.0 MB in the end (delta: -29.1 MB). Peak memory consumption was 5.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 9]: Unable to prove that call of __VERIFIER_error() unreachable Unable to prove that call of __VERIFIER_error() unreachable Reason: overapproximation of shiftLeft at line 58. Possible FailurePath: [L20] char string_A[5], string_B[5]; [L21] int i, j, nc_A, nc_B, found=0; [L24] i=0 VAL [found=0, i=0, string_A={6:0}, string_B={7:0}] [L24] COND TRUE i<5 [L25] string_A[i]=__VERIFIER_nondet_char() [L24] i++ VAL [found=0, i=1, string_A={6:0}, string_B={7:0}] [L24] COND TRUE i<5 [L25] string_A[i]=__VERIFIER_nondet_char() [L24] i++ VAL [found=0, i=2, string_A={6:0}, string_B={7:0}] [L24] COND TRUE i<5 [L25] string_A[i]=__VERIFIER_nondet_char() [L24] i++ VAL [found=0, i=3, string_A={6:0}, string_B={7:0}] [L24] COND TRUE i<5 [L25] string_A[i]=__VERIFIER_nondet_char() [L24] i++ VAL [found=0, i=4, string_A={6:0}, string_B={7:0}] [L24] COND TRUE i<5 [L25] string_A[i]=__VERIFIER_nondet_char() [L24] i++ VAL [found=0, i=5, string_A={6:0}, string_B={7:0}] [L24] COND FALSE !(i<5) VAL [found=0, i=5, string_A={6:0}, string_B={7:0}] [L26] EXPR string_A[5 -1] VAL [found=0, i=5, string_A={6:0}, string_A[5 -1]=0, string_B={7:0}] [L26] COND FALSE !(!(string_A[5 -1]=='\0')) [L28] i=0 VAL [found=0, i=0, string_A={6:0}, string_B={7:0}] [L28] COND TRUE i<5 [L29] string_B[i]=__VERIFIER_nondet_char() [L28] i++ VAL [found=0, i=1, string_A={6:0}, string_B={7:0}] [L28] COND TRUE i<5 [L29] string_B[i]=__VERIFIER_nondet_char() [L28] i++ VAL [found=0, i=2, string_A={6:0}, string_B={7:0}] [L28] COND TRUE i<5 [L29] string_B[i]=__VERIFIER_nondet_char() [L28] i++ VAL [found=0, i=3, string_A={6:0}, string_B={7:0}] [L28] COND TRUE i<5 [L29] string_B[i]=__VERIFIER_nondet_char() [L28] i++ VAL [found=0, i=4, string_A={6:0}, string_B={7:0}] [L28] COND TRUE i<5 [L29] string_B[i]=__VERIFIER_nondet_char() [L28] i++ VAL [found=0, i=5, string_A={6:0}, string_B={7:0}] [L28] COND FALSE !(i<5) VAL [found=0, i=5, string_A={6:0}, string_B={7:0}] [L30] EXPR string_B[5 -1] VAL [found=0, i=5, string_A={6:0}, string_B={7:0}, string_B[5 -1]=0] [L30] COND FALSE !(!(string_B[5 -1]=='\0')) [L32] nc_A = 0 VAL [found=0, i=5, nc_A=0, string_A={6:0}, string_B={7:0}] [L33] EXPR string_A[nc_A] VAL [found=0, i=5, nc_A=0, string_A={6:0}, string_A[nc_A]=0, string_B={7:0}] [L33] COND FALSE !(string_A[nc_A]!='\0') [L36] nc_B = 0 VAL [found=0, i=5, nc_A=0, nc_B=0, string_A={6:0}, string_B={7:0}] [L37] EXPR string_B[nc_B] VAL [found=0, i=5, nc_A=0, nc_B=0, string_A={6:0}, string_B={7:0}, string_B[nc_B]=0] [L37] COND FALSE !(string_B[nc_B]!='\0') [L40] COND FALSE !(!(nc_B >= nc_A)) [L43] EXPR j=0 [L43] i=j=0 VAL [found=0, i=0, j=0, nc_A=0, nc_B=0, string_A={6:0}, string_B={7:0}] [L44] COND FALSE !((inc_B-1)<