/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 0.1.25-3af5e1f [2020-09-04 13:43:09,977 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-04 13:43:09,984 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-04 13:43:10,012 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-04 13:43:10,013 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-04 13:43:10,014 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-04 13:43:10,015 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-04 13:43:10,017 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-04 13:43:10,019 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-04 13:43:10,020 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-04 13:43:10,021 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-04 13:43:10,022 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-04 13:43:10,022 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-04 13:43:10,023 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-04 13:43:10,024 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-04 13:43:10,026 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-04 13:43:10,027 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-04 13:43:10,028 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-04 13:43:10,029 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-04 13:43:10,031 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-04 13:43:10,033 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-04 13:43:10,034 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-04 13:43:10,035 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-04 13:43:10,036 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-04 13:43:10,039 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-09-04 13:43:10,045 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-09-04 13:43:10,046 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-09-04 13:43:10,047 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-09-04 13:43:10,047 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-09-04 13:43:10,048 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-09-04 13:43:10,049 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-09-04 13:43:10,049 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-09-04 13:43:10,050 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-09-04 13:43:10,050 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-04 13:43:10,051 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-04 13:43:10,052 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-04 13:43:10,052 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-09-04 13:43:10,087 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-04 13:43:10,087 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-04 13:43:10,089 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-04 13:43:10,089 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-04 13:43:10,089 INFO L138 SettingsManager]: * Use SBE=true [2020-09-04 13:43:10,090 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-04 13:43:10,090 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-04 13:43:10,091 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-04 13:43:10,091 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-04 13:43:10,091 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-04 13:43:10,091 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-04 13:43:10,091 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-04 13:43:10,092 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-04 13:43:10,092 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-04 13:43:10,092 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-04 13:43:10,092 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-04 13:43:10,092 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-04 13:43:10,093 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-04 13:43:10,094 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-04 13:43:10,095 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-04 13:43:10,095 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-04 13:43:10,095 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-04 13:43:10,095 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-04 13:43:10,095 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-04 13:43:10,096 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-04 13:43:10,096 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-04 13:43:10,096 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-04 13:43:10,096 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-04 13:43:10,096 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-04 13:43:10,097 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-09-04 13:43:10,617 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-04 13:43:10,643 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-04 13:43:10,649 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-04 13:43:10,651 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-04 13:43:10,651 INFO L275 PluginConnector]: CDTParser initialized [2020-09-04 13:43:10,653 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/string-2.i [2020-09-04 13:43:10,745 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/a9db0a94e/90e8bfa4b6b342beb1431f4f9a4e5ff6/FLAG4eb0a67a3 [2020-09-04 13:43:11,295 INFO L306 CDTParser]: Found 1 translation units. [2020-09-04 13:43:11,296 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/string-2.i [2020-09-04 13:43:11,305 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/a9db0a94e/90e8bfa4b6b342beb1431f4f9a4e5ff6/FLAG4eb0a67a3 [2020-09-04 13:43:11,638 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/a9db0a94e/90e8bfa4b6b342beb1431f4f9a4e5ff6 [2020-09-04 13:43:11,653 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-04 13:43:11,655 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-04 13:43:11,657 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-04 13:43:11,657 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-04 13:43:11,661 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-04 13:43:11,662 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 01:43:11" (1/1) ... [2020-09-04 13:43:11,667 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@39c1a6e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:43:11, skipping insertion in model container [2020-09-04 13:43:11,667 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 01:43:11" (1/1) ... [2020-09-04 13:43:11,677 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-04 13:43:11,704 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-04 13:43:11,960 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 13:43:11,965 INFO L203 MainTranslator]: Completed pre-run [2020-09-04 13:43:11,994 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 13:43:12,016 INFO L208 MainTranslator]: Completed translation [2020-09-04 13:43:12,016 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:43:12 WrapperNode [2020-09-04 13:43:12,017 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-04 13:43:12,018 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-04 13:43:12,018 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-04 13:43:12,018 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-04 13:43:12,122 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:43:12" (1/1) ... [2020-09-04 13:43:12,123 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:43:12" (1/1) ... [2020-09-04 13:43:12,145 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:43:12" (1/1) ... [2020-09-04 13:43:12,145 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:43:12" (1/1) ... [2020-09-04 13:43:12,160 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:43:12" (1/1) ... [2020-09-04 13:43:12,168 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:43:12" (1/1) ... [2020-09-04 13:43:12,170 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:43:12" (1/1) ... [2020-09-04 13:43:12,173 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-04 13:43:12,174 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-04 13:43:12,174 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-04 13:43:12,174 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-04 13:43:12,176 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:43:12" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-04 13:43:12,253 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-04 13:43:12,254 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-04 13:43:12,254 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-09-04 13:43:12,254 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-09-04 13:43:12,254 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-04 13:43:12,254 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-04 13:43:12,255 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-09-04 13:43:12,255 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-09-04 13:43:12,255 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-09-04 13:43:12,255 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-09-04 13:43:12,255 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-04 13:43:12,256 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-09-04 13:43:12,256 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-09-04 13:43:12,256 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-09-04 13:43:12,256 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-09-04 13:43:12,257 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-04 13:43:12,257 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-04 13:43:12,644 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-04 13:43:12,644 INFO L295 CfgBuilder]: Removed 5 assume(true) statements. [2020-09-04 13:43:12,649 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 01:43:12 BoogieIcfgContainer [2020-09-04 13:43:12,649 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-04 13:43:12,651 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-04 13:43:12,651 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-04 13:43:12,654 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-04 13:43:12,655 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 04.09 01:43:11" (1/3) ... [2020-09-04 13:43:12,656 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@16eb34b9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 01:43:12, skipping insertion in model container [2020-09-04 13:43:12,656 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:43:12" (2/3) ... [2020-09-04 13:43:12,656 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@16eb34b9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 01:43:12, skipping insertion in model container [2020-09-04 13:43:12,656 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 01:43:12" (3/3) ... [2020-09-04 13:43:12,659 INFO L109 eAbstractionObserver]: Analyzing ICFG string-2.i [2020-09-04 13:43:12,670 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-09-04 13:43:12,680 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-04 13:43:12,703 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-04 13:43:12,735 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-04 13:43:12,736 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-04 13:43:12,736 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-09-04 13:43:12,736 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-04 13:43:12,736 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-04 13:43:12,736 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-04 13:43:12,736 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-04 13:43:12,737 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-04 13:43:12,758 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states. [2020-09-04 13:43:12,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-09-04 13:43:12,765 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:43:12,766 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] [2020-09-04 13:43:12,767 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:43:12,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:43:12,773 INFO L82 PathProgramCache]: Analyzing trace with hash -522531256, now seen corresponding path program 1 times [2020-09-04 13:43:12,785 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:43:12,785 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1899847789] [2020-09-04 13:43:12,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:43:12,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:13,021 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:43:13,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:13,035 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:43:13,036 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1899847789] [2020-09-04 13:43:13,038 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 13:43:13,038 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-09-04 13:43:13,039 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [676171193] [2020-09-04 13:43:13,045 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-09-04 13:43:13,045 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:43:13,059 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-09-04 13:43:13,060 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-09-04 13:43:13,062 INFO L87 Difference]: Start difference. First operand 35 states. Second operand 4 states. [2020-09-04 13:43:13,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:43:13,279 INFO L93 Difference]: Finished difference Result 73 states and 109 transitions. [2020-09-04 13:43:13,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-09-04 13:43:13,281 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 22 [2020-09-04 13:43:13,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:43:13,296 INFO L225 Difference]: With dead ends: 73 [2020-09-04 13:43:13,296 INFO L226 Difference]: Without dead ends: 36 [2020-09-04 13:43:13,301 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 [2020-09-04 13:43:13,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-09-04 13:43:13,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 30. [2020-09-04 13:43:13,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-09-04 13:43:13,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 35 transitions. [2020-09-04 13:43:13,359 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 35 transitions. Word has length 22 [2020-09-04 13:43:13,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:43:13,360 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 35 transitions. [2020-09-04 13:43:13,360 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-09-04 13:43:13,360 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 35 transitions. [2020-09-04 13:43:13,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-09-04 13:43:13,361 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:43:13,362 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] [2020-09-04 13:43:13,362 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-04 13:43:13,363 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:43:13,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:43:13,363 INFO L82 PathProgramCache]: Analyzing trace with hash -1816798436, now seen corresponding path program 1 times [2020-09-04 13:43:13,364 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:43:13,364 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1847504587] [2020-09-04 13:43:13,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:43:13,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:13,458 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:43:13,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:13,469 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-09-04 13:43:13,470 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1847504587] [2020-09-04 13:43:13,470 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [718037414] [2020-09-04 13:43:13,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-04 13:43:13,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:13,531 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 3 conjunts are in the unsatisfiable core [2020-09-04 13:43:13,539 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-09-04 13:43:13,615 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-09-04 13:43:13,616 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-09-04 13:43:13,616 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2020-09-04 13:43:13,618 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1606919063] [2020-09-04 13:43:13,619 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-09-04 13:43:13,619 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:43:13,620 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-09-04 13:43:13,620 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-09-04 13:43:13,620 INFO L87 Difference]: Start difference. First operand 30 states and 35 transitions. Second operand 6 states. [2020-09-04 13:43:13,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:43:13,736 INFO L93 Difference]: Finished difference Result 65 states and 80 transitions. [2020-09-04 13:43:13,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-04 13:43:13,736 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 28 [2020-09-04 13:43:13,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:43:13,738 INFO L225 Difference]: With dead ends: 65 [2020-09-04 13:43:13,738 INFO L226 Difference]: Without dead ends: 44 [2020-09-04 13:43:13,740 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 [2020-09-04 13:43:13,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-09-04 13:43:13,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 34. [2020-09-04 13:43:13,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-09-04 13:43:13,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 39 transitions. [2020-09-04 13:43:13,761 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 39 transitions. Word has length 28 [2020-09-04 13:43:13,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:43:13,762 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 39 transitions. [2020-09-04 13:43:13,762 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-09-04 13:43:13,762 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 39 transitions. [2020-09-04 13:43:13,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-09-04 13:43:13,763 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:43:13,764 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] [2020-09-04 13:43:13,978 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-09-04 13:43:13,979 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:43:13,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:43:13,980 INFO L82 PathProgramCache]: Analyzing trace with hash 1067646812, now seen corresponding path program 2 times [2020-09-04 13:43:13,980 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:43:13,981 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [299997299] [2020-09-04 13:43:13,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:43:14,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:14,125 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:43:14,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:14,132 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-09-04 13:43:14,133 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [299997299] [2020-09-04 13:43:14,133 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1110206574] [2020-09-04 13:43:14,133 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-04 13:43:14,187 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-09-04 13:43:14,188 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-09-04 13:43:14,189 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 4 conjunts are in the unsatisfiable core [2020-09-04 13:43:14,191 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-09-04 13:43:14,220 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-09-04 13:43:14,220 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-09-04 13:43:14,220 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2020-09-04 13:43:14,221 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1718227799] [2020-09-04 13:43:14,221 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-09-04 13:43:14,222 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:43:14,222 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-09-04 13:43:14,222 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-09-04 13:43:14,223 INFO L87 Difference]: Start difference. First operand 34 states and 39 transitions. Second operand 7 states. [2020-09-04 13:43:14,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:43:14,349 INFO L93 Difference]: Finished difference Result 75 states and 92 transitions. [2020-09-04 13:43:14,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-04 13:43:14,350 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 32 [2020-09-04 13:43:14,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:43:14,351 INFO L225 Difference]: With dead ends: 75 [2020-09-04 13:43:14,351 INFO L226 Difference]: Without dead ends: 52 [2020-09-04 13:43:14,352 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 [2020-09-04 13:43:14,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-09-04 13:43:14,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 38. [2020-09-04 13:43:14,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-09-04 13:43:14,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 43 transitions. [2020-09-04 13:43:14,359 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 43 transitions. Word has length 32 [2020-09-04 13:43:14,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:43:14,360 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 43 transitions. [2020-09-04 13:43:14,360 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-09-04 13:43:14,360 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 43 transitions. [2020-09-04 13:43:14,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-09-04 13:43:14,361 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:43:14,361 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] [2020-09-04 13:43:14,574 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-09-04 13:43:14,575 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:43:14,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:43:14,576 INFO L82 PathProgramCache]: Analyzing trace with hash -1245957476, now seen corresponding path program 3 times [2020-09-04 13:43:14,576 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:43:14,577 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [853122932] [2020-09-04 13:43:14,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:43:14,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:14,711 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:43:14,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:14,717 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 13:43:14,718 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [853122932] [2020-09-04 13:43:14,718 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1201903800] [2020-09-04 13:43:14,718 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-04 13:43:14,772 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2020-09-04 13:43:14,772 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-09-04 13:43:14,773 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 5 conjunts are in the unsatisfiable core [2020-09-04 13:43:14,776 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-09-04 13:43:14,808 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 13:43:14,809 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-09-04 13:43:14,809 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2020-09-04 13:43:14,809 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1898394034] [2020-09-04 13:43:14,810 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-04 13:43:14,810 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:43:14,811 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-04 13:43:14,811 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-09-04 13:43:14,811 INFO L87 Difference]: Start difference. First operand 38 states and 43 transitions. Second operand 8 states. [2020-09-04 13:43:14,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:43:14,952 INFO L93 Difference]: Finished difference Result 85 states and 104 transitions. [2020-09-04 13:43:14,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-09-04 13:43:14,952 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 36 [2020-09-04 13:43:14,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:43:14,954 INFO L225 Difference]: With dead ends: 85 [2020-09-04 13:43:14,955 INFO L226 Difference]: Without dead ends: 60 [2020-09-04 13:43:14,956 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 [2020-09-04 13:43:14,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-09-04 13:43:14,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 42. [2020-09-04 13:43:14,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-09-04 13:43:14,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 47 transitions. [2020-09-04 13:43:14,963 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 47 transitions. Word has length 36 [2020-09-04 13:43:14,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:43:14,963 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 47 transitions. [2020-09-04 13:43:14,963 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-04 13:43:14,963 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 47 transitions. [2020-09-04 13:43:14,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-09-04 13:43:14,965 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:43:14,965 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] [2020-09-04 13:43:15,172 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-09-04 13:43:15,173 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:43:15,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:43:15,174 INFO L82 PathProgramCache]: Analyzing trace with hash -1106103076, now seen corresponding path program 4 times [2020-09-04 13:43:15,174 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:43:15,175 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [180378705] [2020-09-04 13:43:15,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:43:15,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:15,278 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:43:15,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:15,287 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-09-04 13:43:15,287 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [180378705] [2020-09-04 13:43:15,288 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [507781005] [2020-09-04 13:43:15,288 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-04 13:43:15,341 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-09-04 13:43:15,341 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-09-04 13:43:15,343 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 6 conjunts are in the unsatisfiable core [2020-09-04 13:43:15,345 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-09-04 13:43:15,379 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-09-04 13:43:15,379 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-09-04 13:43:15,379 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2020-09-04 13:43:15,380 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1570691883] [2020-09-04 13:43:15,380 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-09-04 13:43:15,381 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:43:15,381 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-09-04 13:43:15,381 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-09-04 13:43:15,381 INFO L87 Difference]: Start difference. First operand 42 states and 47 transitions. Second operand 9 states. [2020-09-04 13:43:15,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:43:15,580 INFO L93 Difference]: Finished difference Result 93 states and 114 transitions. [2020-09-04 13:43:15,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-09-04 13:43:15,581 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 40 [2020-09-04 13:43:15,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:43:15,582 INFO L225 Difference]: With dead ends: 93 [2020-09-04 13:43:15,583 INFO L226 Difference]: Without dead ends: 66 [2020-09-04 13:43:15,583 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 [2020-09-04 13:43:15,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-09-04 13:43:15,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 46. [2020-09-04 13:43:15,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-09-04 13:43:15,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2020-09-04 13:43:15,590 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 40 [2020-09-04 13:43:15,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:43:15,591 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2020-09-04 13:43:15,591 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-09-04 13:43:15,591 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2020-09-04 13:43:15,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-09-04 13:43:15,592 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:43:15,593 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] [2020-09-04 13:43:15,807 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-09-04 13:43:15,808 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:43:15,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:43:15,809 INFO L82 PathProgramCache]: Analyzing trace with hash 1061537308, now seen corresponding path program 5 times [2020-09-04 13:43:15,809 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:43:15,810 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1072705306] [2020-09-04 13:43:15,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:43:15,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-04 13:43:15,879 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-09-04 13:43:15,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-04 13:43:15,920 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-09-04 13:43:15,960 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-09-04 13:43:15,960 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-09-04 13:43:15,960 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-09-04 13:43:16,011 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 04.09 01:43:16 BoogieIcfgContainer [2020-09-04 13:43:16,011 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-09-04 13:43:16,015 INFO L168 Benchmark]: Toolchain (without parser) took 4358.77 ms. Allocated memory was 147.8 MB in the beginning and 242.2 MB in the end (delta: 94.4 MB). Free memory was 104.1 MB in the beginning and 194.9 MB in the end (delta: -90.8 MB). Peak memory consumption was 3.6 MB. Max. memory is 7.1 GB. [2020-09-04 13:43:16,016 INFO L168 Benchmark]: CDTParser took 0.51 ms. Allocated memory is still 147.8 MB. Free memory was 122.6 MB in the beginning and 122.1 MB in the end (delta: 419.8 kB). Peak memory consumption was 419.8 kB. Max. memory is 7.1 GB. [2020-09-04 13:43:16,017 INFO L168 Benchmark]: CACSL2BoogieTranslator took 360.71 ms. Allocated memory is still 147.8 MB. Free memory was 104.1 MB in the beginning and 93.1 MB in the end (delta: 11.0 MB). Peak memory consumption was 11.0 MB. Max. memory is 7.1 GB. [2020-09-04 13:43:16,018 INFO L168 Benchmark]: Boogie Preprocessor took 156.12 ms. Allocated memory was 147.8 MB in the beginning and 203.9 MB in the end (delta: 56.1 MB). Free memory was 93.1 MB in the beginning and 181.3 MB in the end (delta: -88.2 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. [2020-09-04 13:43:16,019 INFO L168 Benchmark]: RCFGBuilder took 475.46 ms. Allocated memory is still 203.9 MB. Free memory was 181.3 MB in the beginning and 161.6 MB in the end (delta: 19.7 MB). Peak memory consumption was 19.7 MB. Max. memory is 7.1 GB. [2020-09-04 13:43:16,020 INFO L168 Benchmark]: TraceAbstraction took 3360.62 ms. Allocated memory was 203.9 MB in the beginning and 242.2 MB in the end (delta: 38.3 MB). Free memory was 161.6 MB in the beginning and 194.9 MB in the end (delta: -33.3 MB). Peak memory consumption was 5.0 MB. Max. memory is 7.1 GB. [2020-09-04 13:43:16,024 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.51 ms. Allocated memory is still 147.8 MB. Free memory was 122.6 MB in the beginning and 122.1 MB in the end (delta: 419.8 kB). Peak memory consumption was 419.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 360.71 ms. Allocated memory is still 147.8 MB. Free memory was 104.1 MB in the beginning and 93.1 MB in the end (delta: 11.0 MB). Peak memory consumption was 11.0 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 156.12 ms. Allocated memory was 147.8 MB in the beginning and 203.9 MB in the end (delta: 56.1 MB). Free memory was 93.1 MB in the beginning and 181.3 MB in the end (delta: -88.2 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. * RCFGBuilder took 475.46 ms. Allocated memory is still 203.9 MB. Free memory was 181.3 MB in the beginning and 161.6 MB in the end (delta: 19.7 MB). Peak memory consumption was 19.7 MB. Max. memory is 7.1 GB. * TraceAbstraction took 3360.62 ms. Allocated memory was 203.9 MB in the beginning and 242.2 MB in the end (delta: 38.3 MB). Free memory was 161.6 MB in the beginning and 194.9 MB in the end (delta: -33.3 MB). Peak memory consumption was 5.0 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)<