/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-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-72570d3 [2020-08-22 16:57:02,784 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 16:57:02,787 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 16:57:02,810 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-22 16:57:02,810 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-22 16:57:02,812 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-22 16:57:02,813 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-22 16:57:02,815 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-22 16:57:02,816 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-22 16:57:02,817 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-22 16:57:02,818 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-22 16:57:02,819 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-22 16:57:02,819 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 16:57:02,820 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 16:57:02,821 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 16:57:02,822 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 16:57:02,823 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 16:57:02,824 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 16:57:02,826 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 16:57:02,828 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 16:57:02,829 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 16:57:02,830 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 16:57:02,831 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 16:57:02,832 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 16:57:02,834 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-22 16:57:02,842 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 16:57:02,843 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 16:57:02,843 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 16:57:02,844 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 16:57:02,878 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 16:57:02,879 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 16:57:02,882 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-22 16:57:02,882 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-22 16:57:02,882 INFO L138 SettingsManager]: * Use SBE=true [2020-08-22 16:57:02,883 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 16:57:02,883 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 16:57:02,883 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 16:57:02,883 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 16:57:02,884 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 16:57:02,888 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 16:57:02,888 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 16:57:02,888 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 16:57:02,888 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 16:57:02,889 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 16:57:02,889 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 16:57:02,889 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 16:57:02,889 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 16:57:02,891 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-22 16:57:02,891 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 16:57:02,891 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 16:57:02,891 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 16:57:02,892 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 16:57:02,892 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-22 16:57:02,892 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-22 16:57:02,892 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-22 16:57:02,892 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-22 16:57:02,892 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 16:57:02,893 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-22 16:57:02,893 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-08-22 16:57:03,196 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 16:57:03,208 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 16:57:03,212 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 16:57:03,213 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 16:57:03,214 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 16:57:03,214 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/string-1.i [2020-08-22 16:57:03,289 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/770357557/6f1a7eff02164f938f49ec498c71f5bd/FLAG5b1d86769 [2020-08-22 16:57:03,735 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 16:57:03,736 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/string-1.i [2020-08-22 16:57:03,745 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/770357557/6f1a7eff02164f938f49ec498c71f5bd/FLAG5b1d86769 [2020-08-22 16:57:04,120 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/770357557/6f1a7eff02164f938f49ec498c71f5bd [2020-08-22 16:57:04,129 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 16:57:04,131 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 16:57:04,132 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 16:57:04,132 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 16:57:04,138 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 16:57:04,139 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 04:57:04" (1/1) ... [2020-08-22 16:57:04,143 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2a430905 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:57:04, skipping insertion in model container [2020-08-22 16:57:04,143 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 04:57:04" (1/1) ... [2020-08-22 16:57:04,153 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 16:57:04,171 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 16:57:04,355 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 16:57:04,360 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 16:57:04,387 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 16:57:04,407 INFO L208 MainTranslator]: Completed translation [2020-08-22 16:57:04,407 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:57:04 WrapperNode [2020-08-22 16:57:04,407 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 16:57:04,408 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 16:57:04,408 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 16:57:04,408 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 16:57:04,507 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:57:04" (1/1) ... [2020-08-22 16:57:04,508 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:57:04" (1/1) ... [2020-08-22 16:57:04,516 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:57:04" (1/1) ... [2020-08-22 16:57:04,516 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:57:04" (1/1) ... [2020-08-22 16:57:04,535 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:57:04" (1/1) ... [2020-08-22 16:57:04,548 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:57:04" (1/1) ... [2020-08-22 16:57:04,549 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:57:04" (1/1) ... [2020-08-22 16:57:04,552 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 16:57:04,552 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 16:57:04,552 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 16:57:04,552 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 16:57:04,555 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:57:04" (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 16:57:04,610 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 16:57:04,611 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 16:57:04,611 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-22 16:57:04,611 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-22 16:57:04,611 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 16:57:04,612 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 16:57:04,612 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-22 16:57:04,612 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-22 16:57:04,612 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-22 16:57:04,612 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-08-22 16:57:04,612 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 16:57:04,613 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-22 16:57:04,613 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-22 16:57:04,613 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-22 16:57:04,613 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-22 16:57:04,613 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 16:57:04,613 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 16:57:04,979 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 16:57:04,980 INFO L295 CfgBuilder]: Removed 5 assume(true) statements. [2020-08-22 16:57:04,984 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 04:57:04 BoogieIcfgContainer [2020-08-22 16:57:04,984 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 16:57:04,997 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 16:57:04,997 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 16:57:05,003 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 16:57:05,003 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 04:57:04" (1/3) ... [2020-08-22 16:57:05,004 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15ae97c2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 04:57:05, skipping insertion in model container [2020-08-22 16:57:05,004 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:57:04" (2/3) ... [2020-08-22 16:57:05,004 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15ae97c2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 04:57:05, skipping insertion in model container [2020-08-22 16:57:05,004 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 04:57:04" (3/3) ... [2020-08-22 16:57:05,007 INFO L109 eAbstractionObserver]: Analyzing ICFG string-1.i [2020-08-22 16:57:05,015 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-08-22 16:57:05,022 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 16:57:05,036 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 16:57:05,059 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 16:57:05,059 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 16:57:05,059 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-08-22 16:57:05,059 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 16:57:05,059 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 16:57:05,060 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 16:57:05,060 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 16:57:05,060 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 16:57:05,076 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states. [2020-08-22 16:57:05,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-22 16:57:05,081 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:57:05,082 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 16:57:05,083 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:57:05,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:57:05,087 INFO L82 PathProgramCache]: Analyzing trace with hash -522531256, now seen corresponding path program 1 times [2020-08-22 16:57:05,096 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:57:05,096 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [602789039] [2020-08-22 16:57:05,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:57:05,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:05,276 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:57:05,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:05,290 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 16:57:05,291 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [602789039] [2020-08-22 16:57:05,292 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 16:57:05,292 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-22 16:57:05,293 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2115445349] [2020-08-22 16:57:05,297 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-22 16:57:05,297 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:57:05,307 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-22 16:57:05,308 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-22 16:57:05,310 INFO L87 Difference]: Start difference. First operand 35 states. Second operand 4 states. [2020-08-22 16:57:05,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:57:05,504 INFO L93 Difference]: Finished difference Result 73 states and 109 transitions. [2020-08-22 16:57:05,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-22 16:57:05,512 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 22 [2020-08-22 16:57:05,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:57:05,530 INFO L225 Difference]: With dead ends: 73 [2020-08-22 16:57:05,530 INFO L226 Difference]: Without dead ends: 36 [2020-08-22 16:57:05,535 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 16:57:05,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-22 16:57:05,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 30. [2020-08-22 16:57:05,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-22 16:57:05,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 35 transitions. [2020-08-22 16:57:05,591 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 35 transitions. Word has length 22 [2020-08-22 16:57:05,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:57:05,593 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 35 transitions. [2020-08-22 16:57:05,593 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-22 16:57:05,593 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 35 transitions. [2020-08-22 16:57:05,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-22 16:57:05,595 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:57:05,595 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 16:57:05,596 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 16:57:05,596 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:57:05,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:57:05,597 INFO L82 PathProgramCache]: Analyzing trace with hash -1816798436, now seen corresponding path program 1 times [2020-08-22 16:57:05,597 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:57:05,598 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1742664441] [2020-08-22 16:57:05,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:57:05,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:05,698 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:57:05,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:05,707 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 16:57:05,708 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1742664441] [2020-08-22 16:57:05,708 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [429726361] [2020-08-22 16:57:05,708 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 16:57:05,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:05,763 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 3 conjunts are in the unsatisfiable core [2020-08-22 16:57:05,770 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:57:05,832 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 16:57:05,833 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:57:05,833 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2020-08-22 16:57:05,834 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2069021492] [2020-08-22 16:57:05,835 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-22 16:57:05,836 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:57:05,836 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-22 16:57:05,836 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-22 16:57:05,836 INFO L87 Difference]: Start difference. First operand 30 states and 35 transitions. Second operand 6 states. [2020-08-22 16:57:05,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:57:05,972 INFO L93 Difference]: Finished difference Result 65 states and 80 transitions. [2020-08-22 16:57:05,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 16:57:05,973 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 28 [2020-08-22 16:57:05,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:57:05,974 INFO L225 Difference]: With dead ends: 65 [2020-08-22 16:57:05,974 INFO L226 Difference]: Without dead ends: 44 [2020-08-22 16:57:05,976 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 16:57:05,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-22 16:57:05,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 34. [2020-08-22 16:57:05,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-22 16:57:05,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 39 transitions. [2020-08-22 16:57:05,984 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 39 transitions. Word has length 28 [2020-08-22 16:57:05,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:57:05,984 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 39 transitions. [2020-08-22 16:57:05,985 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-22 16:57:05,985 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 39 transitions. [2020-08-22 16:57:05,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-22 16:57:05,986 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:57:05,986 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 16:57:06,202 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-08-22 16:57:06,203 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:57:06,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:57:06,204 INFO L82 PathProgramCache]: Analyzing trace with hash 1067646812, now seen corresponding path program 2 times [2020-08-22 16:57:06,205 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:57:06,206 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [15384480] [2020-08-22 16:57:06,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:57:06,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:06,315 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:57:06,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:06,321 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 16:57:06,321 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [15384480] [2020-08-22 16:57:06,322 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1612363802] [2020-08-22 16:57:06,322 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 16:57:06,364 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2020-08-22 16:57:06,365 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-08-22 16:57:06,365 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 7 conjunts are in the unsatisfiable core [2020-08-22 16:57:06,368 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:57:06,404 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-08-22 16:57:06,410 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-08-22 16:57:06,449 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-08-22 16:57:06,450 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2020-08-22 16:57:06,450 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [6] total 11 [2020-08-22 16:57:06,450 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2129636307] [2020-08-22 16:57:06,451 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-22 16:57:06,451 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:57:06,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-22 16:57:06,452 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2020-08-22 16:57:06,452 INFO L87 Difference]: Start difference. First operand 34 states and 39 transitions. Second operand 7 states. [2020-08-22 16:57:06,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:57:06,528 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2020-08-22 16:57:06,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-22 16:57:06,528 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 32 [2020-08-22 16:57:06,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:57:06,530 INFO L225 Difference]: With dead ends: 50 [2020-08-22 16:57:06,530 INFO L226 Difference]: Without dead ends: 36 [2020-08-22 16:57:06,531 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2020-08-22 16:57:06,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-22 16:57:06,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-22 16:57:06,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-22 16:57:06,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2020-08-22 16:57:06,537 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 32 [2020-08-22 16:57:06,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:57:06,538 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2020-08-22 16:57:06,538 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-22 16:57:06,538 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2020-08-22 16:57:06,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-22 16:57:06,539 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:57:06,539 INFO L422 BasicCegarLoop]: trace histogram [2, 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 16:57:06,754 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:57:06,755 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:57:06,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:57:06,755 INFO L82 PathProgramCache]: Analyzing trace with hash 939255927, now seen corresponding path program 1 times [2020-08-22 16:57:06,756 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:57:06,757 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1093031505] [2020-08-22 16:57:06,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:57:06,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:06,816 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:57:06,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:06,821 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-08-22 16:57:06,822 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1093031505] [2020-08-22 16:57:06,822 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1823894891] [2020-08-22 16:57:06,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -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 16:57:06,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:06,875 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 4 conjunts are in the unsatisfiable core [2020-08-22 16:57:06,879 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:57:06,912 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-08-22 16:57:06,914 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:57:06,914 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2020-08-22 16:57:06,916 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [937375118] [2020-08-22 16:57:06,916 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-22 16:57:06,916 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:57:06,917 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-22 16:57:06,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-22 16:57:06,917 INFO L87 Difference]: Start difference. First operand 36 states and 41 transitions. Second operand 7 states. [2020-08-22 16:57:07,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:57:07,039 INFO L93 Difference]: Finished difference Result 79 states and 96 transitions. [2020-08-22 16:57:07,039 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-22 16:57:07,039 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 34 [2020-08-22 16:57:07,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:57:07,041 INFO L225 Difference]: With dead ends: 79 [2020-08-22 16:57:07,041 INFO L226 Difference]: Without dead ends: 54 [2020-08-22 16:57:07,042 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 35 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 16:57:07,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-22 16:57:07,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 40. [2020-08-22 16:57:07,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-22 16:57:07,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 45 transitions. [2020-08-22 16:57:07,049 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 45 transitions. Word has length 34 [2020-08-22 16:57:07,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:57:07,049 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 45 transitions. [2020-08-22 16:57:07,049 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-22 16:57:07,050 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 45 transitions. [2020-08-22 16:57:07,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-22 16:57:07,051 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:57:07,051 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 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 16:57:07,264 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:57:07,264 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:57:07,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:57:07,265 INFO L82 PathProgramCache]: Analyzing trace with hash -1936372809, now seen corresponding path program 2 times [2020-08-22 16:57:07,265 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:57:07,266 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1194943247] [2020-08-22 16:57:07,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:57:07,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:07,345 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:57:07,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:07,350 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-08-22 16:57:07,351 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1194943247] [2020-08-22 16:57:07,351 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1113489515] [2020-08-22 16:57:07,351 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 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 16:57:07,389 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2020-08-22 16:57:07,389 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-08-22 16:57:07,390 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 5 conjunts are in the unsatisfiable core [2020-08-22 16:57:07,393 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:57:07,415 INFO L375 QuantifierPusher]: Applying distributivity to a CONJUNCTION[2, 2, 3, 2, 1] term [2020-08-22 16:57:07,416 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-08-22 16:57:07,442 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-08-22 16:57:07,442 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2020-08-22 16:57:07,442 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [7] total 10 [2020-08-22 16:57:07,443 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2028722039] [2020-08-22 16:57:07,443 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 16:57:07,444 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:57:07,444 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 16:57:07,444 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-08-22 16:57:07,444 INFO L87 Difference]: Start difference. First operand 40 states and 45 transitions. Second operand 5 states. [2020-08-22 16:57:07,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:57:07,464 INFO L93 Difference]: Finished difference Result 40 states and 45 transitions. [2020-08-22 16:57:07,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 16:57:07,464 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 38 [2020-08-22 16:57:07,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:57:07,465 INFO L225 Difference]: With dead ends: 40 [2020-08-22 16:57:07,465 INFO L226 Difference]: Without dead ends: 0 [2020-08-22 16:57:07,466 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-22 16:57:07,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-08-22 16:57:07,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-08-22 16:57:07,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-08-22 16:57:07,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-08-22 16:57:07,467 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 38 [2020-08-22 16:57:07,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:57:07,467 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-08-22 16:57:07,468 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 16:57:07,468 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-08-22 16:57:07,468 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-08-22 16:57:07,677 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:57:07,681 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-08-22 16:57:07,781 INFO L268 CegarLoopResult]: For program point ULTIMATE.initFINAL(line -1) no Hoare annotation was computed. [2020-08-22 16:57:07,781 INFO L264 CegarLoopResult]: At program point ULTIMATE.initENTRY(line -1) the Hoare annotation is: (and (= |#NULL.base| |old(#NULL.base)|) (= |#NULL.offset| |old(#NULL.offset)|) (= |old(#valid)| |#valid|)) [2020-08-22 16:57:07,781 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-08-22 16:57:07,781 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-08-22 16:57:07,782 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-08-22 16:57:07,782 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-08-22 16:57:07,782 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-08-22 16:57:07,782 INFO L268 CegarLoopResult]: For program point assume_abort_if_notENTRY(lines 4 6) no Hoare annotation was computed. [2020-08-22 16:57:07,782 INFO L268 CegarLoopResult]: For program point L5(line 5) no Hoare annotation was computed. [2020-08-22 16:57:07,782 INFO L268 CegarLoopResult]: For program point L5-2(lines 4 6) no Hoare annotation was computed. [2020-08-22 16:57:07,783 INFO L268 CegarLoopResult]: For program point assume_abort_if_notEXIT(lines 4 6) no Hoare annotation was computed. [2020-08-22 16:57:07,783 INFO L264 CegarLoopResult]: At program point L35-3(lines 35 36) the Hoare annotation is: (or (= 1 main_~found~0) (= 0 main_~found~0)) [2020-08-22 16:57:07,783 INFO L268 CegarLoopResult]: For program point L35-4(lines 18 61) no Hoare annotation was computed. [2020-08-22 16:57:07,783 INFO L268 CegarLoopResult]: For program point L31-1(lines 31 32) no Hoare annotation was computed. [2020-08-22 16:57:07,783 INFO L264 CegarLoopResult]: At program point L31-3(lines 31 32) the Hoare annotation is: (or (= 1 main_~found~0) (= 0 main_~found~0)) [2020-08-22 16:57:07,784 INFO L268 CegarLoopResult]: For program point L31-4(lines 31 32) no Hoare annotation was computed. [2020-08-22 16:57:07,786 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 17 61) no Hoare annotation was computed. [2020-08-22 16:57:07,786 INFO L268 CegarLoopResult]: For program point L44(lines 44 53) no Hoare annotation was computed. [2020-08-22 16:57:07,786 INFO L264 CegarLoopResult]: At program point L44-2(lines 42 54) the Hoare annotation is: (or (= 1 main_~found~0) (= 0 main_~found~0) (and (<= 0 main_~j~0) (<= main_~nc_B~0 0))) [2020-08-22 16:57:07,786 INFO L268 CegarLoopResult]: For program point L28(line 28) no Hoare annotation was computed. [2020-08-22 16:57:07,786 INFO L268 CegarLoopResult]: For program point L24(line 24) no Hoare annotation was computed. [2020-08-22 16:57:07,787 INFO L264 CegarLoopResult]: At program point L58(line 58) the Hoare annotation is: (or (= 1 main_~found~0) (= 0 main_~found~0)) [2020-08-22 16:57:07,787 INFO L268 CegarLoopResult]: For program point L58-1(line 58) no Hoare annotation was computed. [2020-08-22 16:57:07,787 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 17 61) no Hoare annotation was computed. [2020-08-22 16:57:07,787 INFO L268 CegarLoopResult]: For program point L42-2(lines 42 54) no Hoare annotation was computed. [2020-08-22 16:57:07,787 INFO L264 CegarLoopResult]: At program point mainENTRY(lines 17 61) the Hoare annotation is: (= |old(#valid)| |#valid|) [2020-08-22 16:57:07,787 INFO L268 CegarLoopResult]: For program point L26-2(lines 26 27) no Hoare annotation was computed. [2020-08-22 16:57:07,788 INFO L264 CegarLoopResult]: At program point L26-3(lines 26 27) the Hoare annotation is: (or (= 1 main_~found~0) (= 0 main_~found~0)) [2020-08-22 16:57:07,788 INFO L268 CegarLoopResult]: For program point L26-4(lines 26 27) no Hoare annotation was computed. [2020-08-22 16:57:07,788 INFO L268 CegarLoopResult]: For program point L22-2(lines 22 23) no Hoare annotation was computed. [2020-08-22 16:57:07,789 INFO L264 CegarLoopResult]: At program point L22-3(lines 22 23) the Hoare annotation is: (or (= 1 main_~found~0) (= 0 main_~found~0)) [2020-08-22 16:57:07,789 INFO L268 CegarLoopResult]: For program point L22-4(lines 22 23) no Hoare annotation was computed. [2020-08-22 16:57:07,789 INFO L268 CegarLoopResult]: For program point L35-1(lines 35 36) no Hoare annotation was computed. [2020-08-22 16:57:07,789 INFO L271 CegarLoopResult]: At program point __VERIFIER_assertENTRY(lines 7 12) the Hoare annotation is: true [2020-08-22 16:57:07,789 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertEXIT(lines 7 12) no Hoare annotation was computed. [2020-08-22 16:57:07,789 INFO L268 CegarLoopResult]: For program point L9(line 9) no Hoare annotation was computed. [2020-08-22 16:57:07,790 INFO L268 CegarLoopResult]: For program point L8(lines 8 10) no Hoare annotation was computed. [2020-08-22 16:57:07,791 INFO L268 CegarLoopResult]: For program point L8-2(lines 7 12) no Hoare annotation was computed. [2020-08-22 16:57:07,791 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 9) no Hoare annotation was computed. [2020-08-22 16:57:07,814 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.08 04:57:07 BoogieIcfgContainer [2020-08-22 16:57:07,815 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-22 16:57:07,818 INFO L168 Benchmark]: Toolchain (without parser) took 3685.67 ms. Allocated memory was 147.3 MB in the beginning and 234.9 MB in the end (delta: 87.6 MB). Free memory was 103.8 MB in the beginning and 83.3 MB in the end (delta: 20.5 MB). Peak memory consumption was 108.1 MB. Max. memory is 7.1 GB. [2020-08-22 16:57:07,820 INFO L168 Benchmark]: CDTParser took 0.27 ms. Allocated memory is still 147.3 MB. Free memory was 122.0 MB in the beginning and 121.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-08-22 16:57:07,827 INFO L168 Benchmark]: CACSL2BoogieTranslator took 275.73 ms. Allocated memory is still 147.3 MB. Free memory was 103.6 MB in the beginning and 92.9 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 7.1 GB. [2020-08-22 16:57:07,828 INFO L168 Benchmark]: Boogie Preprocessor took 143.86 ms. Allocated memory was 147.3 MB in the beginning and 202.9 MB in the end (delta: 55.6 MB). Free memory was 92.9 MB in the beginning and 180.3 MB in the end (delta: -87.4 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. [2020-08-22 16:57:07,829 INFO L168 Benchmark]: RCFGBuilder took 438.32 ms. Allocated memory is still 202.9 MB. Free memory was 180.3 MB in the beginning and 160.8 MB in the end (delta: 19.5 MB). Peak memory consumption was 19.5 MB. Max. memory is 7.1 GB. [2020-08-22 16:57:07,830 INFO L168 Benchmark]: TraceAbstraction took 2817.94 ms. Allocated memory was 202.9 MB in the beginning and 234.9 MB in the end (delta: 32.0 MB). Free memory was 160.1 MB in the beginning and 83.3 MB in the end (delta: 76.9 MB). Peak memory consumption was 108.8 MB. Max. memory is 7.1 GB. [2020-08-22 16:57:07,843 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.27 ms. Allocated memory is still 147.3 MB. Free memory was 122.0 MB in the beginning and 121.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 275.73 ms. Allocated memory is still 147.3 MB. Free memory was 103.6 MB in the beginning and 92.9 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 143.86 ms. Allocated memory was 147.3 MB in the beginning and 202.9 MB in the end (delta: 55.6 MB). Free memory was 92.9 MB in the beginning and 180.3 MB in the end (delta: -87.4 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. * RCFGBuilder took 438.32 ms. Allocated memory is still 202.9 MB. Free memory was 180.3 MB in the beginning and 160.8 MB in the end (delta: 19.5 MB). Peak memory consumption was 19.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2817.94 ms. Allocated memory was 202.9 MB in the beginning and 234.9 MB in the end (delta: 32.0 MB). Free memory was 160.1 MB in the beginning and 83.3 MB in the end (delta: 76.9 MB). Peak memory consumption was 108.8 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 9]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 31]: Loop Invariant Derived loop invariant: 1 == found || 0 == found - InvariantResult [Line: 26]: Loop Invariant Derived loop invariant: 1 == found || 0 == found - InvariantResult [Line: 22]: Loop Invariant Derived loop invariant: 1 == found || 0 == found - InvariantResult [Line: 42]: Loop Invariant Derived loop invariant: (1 == found || 0 == found) || (0 <= j && nc_B <= 0) - InvariantResult [Line: 35]: Loop Invariant Derived loop invariant: 1 == found || 0 == found - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 39 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 2.6s, OverallIterations: 5, TraceHistogramMax: 3, AutomataDifference: 0.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.1s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 139 SDtfs, 78 SDslu, 304 SDs, 0 SdLazy, 250 SolverSat, 34 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 164 GetRequests, 133 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=40occurred in iteration=4, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 5 MinimizatonAttempts, 30 StatesRemovedByMinimization, 3 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 11 LocationsWithAnnotation, 16 PreInvPairs, 30 NumberOfFragments, 65 HoareAnnotationTreeSize, 16 FomulaSimplifications, 87 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 11 FomulaSimplificationsInter, 24 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.5s InterpolantComputationTime, 286 NumberOfCodeBlocks, 264 NumberOfCodeBlocksAsserted, 9 NumberOfCheckSat, 277 ConstructedInterpolants, 0 QuantifiedInterpolants, 13046 SizeOfPredicates, 10 NumberOfNonLiveVariables, 389 ConjunctsInSsa, 19 ConjunctsInUnsatCore, 9 InterpolantComputations, 3 PerfectInterpolantSequences, 57/80 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...