/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/sum01-2.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 11:51:14,075 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 11:51:14,077 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 11:51:14,105 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 11:51:14,120 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 11:51:14,121 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 11:51:14,122 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 11:51:14,123 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 11:51:14,125 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 11:51:14,126 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 11:51:14,127 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 11:51:14,132 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 11:51:14,134 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 11:51:14,135 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 11:51:14,135 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 11:51:14,137 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 11:51:14,141 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 11:51:14,147 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 11:51:14,147 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 11:51:14,148 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 11:51:14,149 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 [2021-05-02 11:51:14,175 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 11:51:14,175 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 11:51:14,177 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 11:51:14,177 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 11:51:14,177 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 11:51:14,177 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 11:51:14,177 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 11:51:14,178 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 11:51:14,178 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 11:51:14,178 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 11:51:14,178 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 11:51:14,178 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 11:51:14,179 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 11:51:14,179 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 11:51:14,179 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 11:51:14,179 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 11:51:14,179 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 11:51:14,186 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 11:51:14,186 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 11:51:14,187 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 11:51:14,187 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 11:51:14,187 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 11:51:14,187 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 11:51:14,187 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 11:51:14,187 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 11:51:14,187 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 11:51:14,187 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 11:51:14,187 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 11:51:14,188 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 11:51:14,429 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 11:51:14,445 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 11:51:14,447 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 11:51:14,447 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 11:51:14,448 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 11:51:14,449 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/sum01-2.i [2021-05-02 11:51:14,523 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/16520d063/1e1bcee1dd49431893895287f9a32123/FLAGbb7e32cb2 [2021-05-02 11:51:14,790 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 11:51:14,791 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/sum01-2.i [2021-05-02 11:51:14,805 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/16520d063/1e1bcee1dd49431893895287f9a32123/FLAGbb7e32cb2 [2021-05-02 11:51:15,228 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/16520d063/1e1bcee1dd49431893895287f9a32123 [2021-05-02 11:51:15,231 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 11:51:15,234 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 11:51:15,243 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 11:51:15,244 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 11:51:15,246 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 11:51:15,246 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 11:51:15" (1/1) ... [2021-05-02 11:51:15,247 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7c359cc4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:51:15, skipping insertion in model container [2021-05-02 11:51:15,247 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 11:51:15" (1/1) ... [2021-05-02 11:51:15,264 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 11:51:15,273 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 11:51:15,346 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/sum01-2.i[849,862] [2021-05-02 11:51:15,351 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 11:51:15,356 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 11:51:15,363 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/sum01-2.i[849,862] [2021-05-02 11:51:15,365 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 11:51:15,373 INFO L208 MainTranslator]: Completed translation [2021-05-02 11:51:15,373 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:51:15 WrapperNode [2021-05-02 11:51:15,373 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 11:51:15,374 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 11:51:15,374 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 11:51:15,374 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 11:51:15,385 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:51:15" (1/1) ... [2021-05-02 11:51:15,385 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:51:15" (1/1) ... [2021-05-02 11:51:15,393 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:51:15" (1/1) ... [2021-05-02 11:51:15,393 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:51:15" (1/1) ... [2021-05-02 11:51:15,396 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:51:15" (1/1) ... [2021-05-02 11:51:15,405 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:51:15" (1/1) ... [2021-05-02 11:51:15,407 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:51:15" (1/1) ... [2021-05-02 11:51:15,409 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 11:51:15,410 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 11:51:15,410 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 11:51:15,410 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 11:51:15,410 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:51:15" (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 [2021-05-02 11:51:15,469 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 11:51:15,469 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 11:51:15,469 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 11:51:15,469 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 11:51:15,469 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 11:51:15,469 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 11:51:15,469 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 11:51:15,469 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-02 11:51:15,469 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-02 11:51:15,469 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 11:51:15,469 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 11:51:15,470 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 11:51:15,470 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-02 11:51:15,470 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 11:51:15,470 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 11:51:15,470 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 11:51:15,470 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 11:51:15,470 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 11:51:15,470 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 11:51:15,470 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 11:51:15,632 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 11:51:15,633 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 11:51:15,634 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 11:51:15 BoogieIcfgContainer [2021-05-02 11:51:15,634 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 11:51:15,635 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 11:51:15,635 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 11:51:15,637 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 11:51:15,637 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 11:51:15" (1/3) ... [2021-05-02 11:51:15,637 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7690023d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 11:51:15, skipping insertion in model container [2021-05-02 11:51:15,638 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:51:15" (2/3) ... [2021-05-02 11:51:15,638 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7690023d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 11:51:15, skipping insertion in model container [2021-05-02 11:51:15,638 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 11:51:15" (3/3) ... [2021-05-02 11:51:15,639 INFO L111 eAbstractionObserver]: Analyzing ICFG sum01-2.i [2021-05-02 11:51:15,643 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 11:51:15,645 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 11:51:15,656 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 11:51:15,670 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 11:51:15,670 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 11:51:15,670 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 11:51:15,670 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 11:51:15,670 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 11:51:15,670 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 11:51:15,670 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 11:51:15,671 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 11:51:15,680 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 14 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 11:51:15,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-02 11:51:15,683 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:51:15,684 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:51:15,684 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:51:15,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:51:15,687 INFO L82 PathProgramCache]: Analyzing trace with hash -241432906, now seen corresponding path program 1 times [2021-05-02 11:51:15,692 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:51:15,693 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1185331254] [2021-05-02 11:51:15,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:51:15,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:15,835 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:51:15,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:15,844 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:51:15,844 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:51:15,844 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1185331254] [2021-05-02 11:51:15,845 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1185331254] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 11:51:15,845 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 11:51:15,845 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 11:51:15,846 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1383719754] [2021-05-02 11:51:15,848 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 11:51:15,849 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:51:15,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 11:51:15,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 11:51:15,857 INFO L87 Difference]: Start difference. First operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 14 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:16,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:51:16,065 INFO L93 Difference]: Finished difference Result 39 states and 47 transitions. [2021-05-02 11:51:16,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 11:51:16,066 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-02 11:51:16,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:51:16,070 INFO L225 Difference]: With dead ends: 39 [2021-05-02 11:51:16,070 INFO L226 Difference]: Without dead ends: 15 [2021-05-02 11:51:16,073 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 135.0ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-02 11:51:16,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-05-02 11:51:16,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-05-02 11:51:16,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.1) internal successors, (11), 10 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:16,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2021-05-02 11:51:16,097 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2021-05-02 11:51:16,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:51:16,098 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2021-05-02 11:51:16,099 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:16,099 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2021-05-02 11:51:16,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 11:51:16,099 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:51:16,099 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:51:16,099 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 11:51:16,100 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:51:16,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:51:16,100 INFO L82 PathProgramCache]: Analyzing trace with hash 1042759188, now seen corresponding path program 1 times [2021-05-02 11:51:16,100 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:51:16,101 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1411700151] [2021-05-02 11:51:16,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:51:16,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:16,247 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:51:16,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:16,270 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:51:16,271 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:51:16,271 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1411700151] [2021-05-02 11:51:16,271 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1411700151] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:16,272 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [154289487] [2021-05-02 11:51:16,272 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 [2021-05-02 11:51:16,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:16,323 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 11:51:16,326 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:51:16,404 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:16,432 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:16,439 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:16,451 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:16,486 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:51:16,487 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [154289487] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:16,487 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:51:16,487 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 15 [2021-05-02 11:51:16,487 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [205415641] [2021-05-02 11:51:16,488 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 11:51:16,488 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:51:16,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 11:51:16,489 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2021-05-02 11:51:16,489 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand has 15 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:16,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:51:16,696 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2021-05-02 11:51:16,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 11:51:16,697 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-05-02 11:51:16,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:51:16,697 INFO L225 Difference]: With dead ends: 22 [2021-05-02 11:51:16,697 INFO L226 Difference]: Without dead ends: 17 [2021-05-02 11:51:16,698 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 263.7ms TimeCoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2021-05-02 11:51:16,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-02 11:51:16,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-05-02 11:51:16,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.0833333333333333) internal successors, (13), 12 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:16,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2021-05-02 11:51:16,701 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2021-05-02 11:51:16,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:51:16,701 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2021-05-02 11:51:16,701 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:16,702 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2021-05-02 11:51:16,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-05-02 11:51:16,702 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:51:16,702 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:51:16,902 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-02 11:51:16,903 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:51:16,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:51:16,904 INFO L82 PathProgramCache]: Analyzing trace with hash -1799219726, now seen corresponding path program 2 times [2021-05-02 11:51:16,904 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:51:16,904 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1476363659] [2021-05-02 11:51:16,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:51:16,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:17,041 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:51:17,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:17,046 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:51:17,047 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:51:17,047 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1476363659] [2021-05-02 11:51:17,047 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1476363659] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:17,047 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [449712484] [2021-05-02 11:51:17,047 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 [2021-05-02 11:51:17,090 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 11:51:17,090 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:51:17,091 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 11:51:17,092 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:51:17,158 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:17,180 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:17,185 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:17,191 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:17,197 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:17,203 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:17,232 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:51:17,232 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [449712484] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:17,233 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:51:17,233 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 18 [2021-05-02 11:51:17,233 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [752255850] [2021-05-02 11:51:17,233 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 11:51:17,233 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:51:17,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 11:51:17,234 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2021-05-02 11:51:17,234 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand has 18 states, 16 states have (on average 1.1875) internal successors, (19), 15 states have internal predecessors, (19), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:17,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:51:17,656 INFO L93 Difference]: Finished difference Result 27 states and 28 transitions. [2021-05-02 11:51:17,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 11:51:17,657 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 16 states have (on average 1.1875) internal successors, (19), 15 states have internal predecessors, (19), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2021-05-02 11:51:17,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:51:17,657 INFO L225 Difference]: With dead ends: 27 [2021-05-02 11:51:17,657 INFO L226 Difference]: Without dead ends: 21 [2021-05-02 11:51:17,658 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 194 ImplicationChecksByTransitivity, 473.3ms TimeCoverageRelationStatistics Valid=134, Invalid=736, Unknown=0, NotChecked=0, Total=870 [2021-05-02 11:51:17,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-05-02 11:51:17,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-05-02 11:51:17,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.0625) internal successors, (17), 16 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:17,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2021-05-02 11:51:17,661 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 16 [2021-05-02 11:51:17,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:51:17,661 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2021-05-02 11:51:17,661 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 16 states have (on average 1.1875) internal successors, (19), 15 states have internal predecessors, (19), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:17,661 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2021-05-02 11:51:17,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 11:51:17,662 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:51:17,662 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:51:17,869 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:51:17,870 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:51:17,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:51:17,870 INFO L82 PathProgramCache]: Analyzing trace with hash 194389806, now seen corresponding path program 3 times [2021-05-02 11:51:17,870 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:51:17,870 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [676958577] [2021-05-02 11:51:17,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:51:17,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:17,992 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:51:17,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:17,999 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 11:51:18,000 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:51:18,000 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [676958577] [2021-05-02 11:51:18,000 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [676958577] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:18,000 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1871372925] [2021-05-02 11:51:18,000 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:51:18,058 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-05-02 11:51:18,059 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:51:18,059 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-02 11:51:18,063 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:51:18,222 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:18,243 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:18,256 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:18,260 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:18,262 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:18,266 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:18,294 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:51:18,294 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1871372925] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:18,294 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:51:18,294 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 23 [2021-05-02 11:51:18,294 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [25646492] [2021-05-02 11:51:18,294 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 11:51:18,295 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:51:18,295 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 11:51:18,295 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=442, Unknown=0, NotChecked=0, Total=506 [2021-05-02 11:51:18,295 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand has 23 states, 21 states have (on average 1.1904761904761905) internal successors, (25), 20 states have internal predecessors, (25), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:18,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:51:18,874 INFO L93 Difference]: Finished difference Result 24 states and 25 transitions. [2021-05-02 11:51:18,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 11:51:18,874 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 21 states have (on average 1.1904761904761905) internal successors, (25), 20 states have internal predecessors, (25), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2021-05-02 11:51:18,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:51:18,875 INFO L225 Difference]: With dead ends: 24 [2021-05-02 11:51:18,875 INFO L226 Difference]: Without dead ends: 0 [2021-05-02 11:51:18,875 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 368 ImplicationChecksByTransitivity, 698.1ms TimeCoverageRelationStatistics Valid=180, Invalid=1302, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 11:51:18,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-05-02 11:51:18,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-05-02 11:51:18,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-02 11:51:18,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-05-02 11:51:18,876 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 20 [2021-05-02 11:51:18,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:51:18,876 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-05-02 11:51:18,876 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 21 states have (on average 1.1904761904761905) internal successors, (25), 20 states have internal predecessors, (25), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:18,876 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-05-02 11:51:18,876 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-05-02 11:51:19,091 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:51:19,093 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2021-05-02 11:51:19,233 INFO L198 CegarLoopUtils]: For program point reach_errorEXIT(line 12) no Hoare annotation was computed. [2021-05-02 11:51:19,233 INFO L198 CegarLoopUtils]: For program point reach_errorENTRY(line 12) no Hoare annotation was computed. [2021-05-02 11:51:19,235 INFO L198 CegarLoopUtils]: For program point L12-1(line 12) no Hoare annotation was computed. [2021-05-02 11:51:19,235 INFO L198 CegarLoopUtils]: For program point ULTIMATE.initFINAL(line -1) no Hoare annotation was computed. [2021-05-02 11:51:19,236 INFO L194 CegarLoopUtils]: At program point ULTIMATE.initENTRY(line -1) the Hoare annotation is: (and (= |#t~string0.offset| |old(#t~string0.offset)|) (= |old(#length)| |#length|) (= |#t~string1.base| |old(#t~string1.base)|) (= |#NULL.base| |old(#NULL.base)|) (= |#t~string0.base| |old(#t~string0.base)|) (= |#NULL.offset| |old(#NULL.offset)|) (= |old(#valid)| |#valid|) (= |#t~string1.offset| |old(#t~string1.offset)|)) [2021-05-02 11:51:19,236 INFO L198 CegarLoopUtils]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2021-05-02 11:51:19,236 INFO L198 CegarLoopUtils]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2021-05-02 11:51:19,236 INFO L201 CegarLoopUtils]: At program point L-1(line -1) the Hoare annotation is: true [2021-05-02 11:51:19,236 INFO L201 CegarLoopUtils]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2021-05-02 11:51:19,236 INFO L198 CegarLoopUtils]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2021-05-02 11:51:19,236 INFO L201 CegarLoopUtils]: At program point mainENTRY(lines 22 29) the Hoare annotation is: true [2021-05-02 11:51:19,237 INFO L198 CegarLoopUtils]: For program point mainEXIT(lines 22 29) no Hoare annotation was computed. [2021-05-02 11:51:19,237 INFO L198 CegarLoopUtils]: For program point L24(line 24) no Hoare annotation was computed. [2021-05-02 11:51:19,237 INFO L198 CegarLoopUtils]: For program point L25-2(lines 25 27) no Hoare annotation was computed. [2021-05-02 11:51:19,237 INFO L194 CegarLoopUtils]: At program point L25-3(lines 25 27) the Hoare annotation is: (or (let ((.cse1 (+ main_~sn~0 2)) (.cse0 (* 2 main_~i~0))) (and (<= .cse0 .cse1) (<= .cse1 .cse0) (< main_~sn~0 (+ (* 2 main_~n~0) 1)))) (and (= main_~sn~0 0) (= main_~i~0 1))) [2021-05-02 11:51:19,238 INFO L194 CegarLoopUtils]: At program point L25-4(lines 25 27) the Hoare annotation is: (or (= main_~sn~0 0) (let ((.cse0 (* 2 main_~n~0))) (and (<= .cse0 main_~sn~0) (< main_~sn~0 (+ .cse0 1))))) [2021-05-02 11:51:19,242 INFO L198 CegarLoopUtils]: For program point mainFINAL(lines 22 29) no Hoare annotation was computed. [2021-05-02 11:51:19,242 INFO L198 CegarLoopUtils]: For program point L17(line 17) no Hoare annotation was computed. [2021-05-02 11:51:19,242 INFO L198 CegarLoopUtils]: For program point L16(lines 16 18) no Hoare annotation was computed. [2021-05-02 11:51:19,242 INFO L201 CegarLoopUtils]: At program point __VERIFIER_assertENTRY(lines 15 20) the Hoare annotation is: true [2021-05-02 11:51:19,242 INFO L198 CegarLoopUtils]: For program point L16-2(lines 15 20) no Hoare annotation was computed. [2021-05-02 11:51:19,242 INFO L198 CegarLoopUtils]: For program point __VERIFIER_assertEXIT(lines 15 20) no Hoare annotation was computed. [2021-05-02 11:51:19,242 INFO L198 CegarLoopUtils]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 17) no Hoare annotation was computed. [2021-05-02 11:51:19,253 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 11:51:19 BoogieIcfgContainer [2021-05-02 11:51:19,253 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-02 11:51:19,254 INFO L168 Benchmark]: Toolchain (without parser) took 4019.51 ms. Allocated memory was 191.9 MB in the beginning and 230.7 MB in the end (delta: 38.8 MB). Free memory was 155.5 MB in the beginning and 132.7 MB in the end (delta: 22.8 MB). Peak memory consumption was 62.6 MB. Max. memory is 8.0 GB. [2021-05-02 11:51:19,254 INFO L168 Benchmark]: CDTParser took 0.09 ms. Allocated memory is still 191.9 MB. Free memory is still 171.7 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 11:51:19,254 INFO L168 Benchmark]: CACSL2BoogieTranslator took 130.20 ms. Allocated memory is still 191.9 MB. Free memory was 155.3 MB in the beginning and 145.9 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2021-05-02 11:51:19,254 INFO L168 Benchmark]: Boogie Preprocessor took 35.15 ms. Allocated memory is still 191.9 MB. Free memory was 145.9 MB in the beginning and 174.0 MB in the end (delta: -28.1 MB). Peak memory consumption was 3.1 MB. Max. memory is 8.0 GB. [2021-05-02 11:51:19,254 INFO L168 Benchmark]: RCFGBuilder took 224.17 ms. Allocated memory is still 191.9 MB. Free memory was 174.0 MB in the beginning and 160.2 MB in the end (delta: 13.7 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. [2021-05-02 11:51:19,254 INFO L168 Benchmark]: TraceAbstraction took 3618.47 ms. Allocated memory was 191.9 MB in the beginning and 230.7 MB in the end (delta: 38.8 MB). Free memory was 159.7 MB in the beginning and 132.7 MB in the end (delta: 27.0 MB). Peak memory consumption was 66.8 MB. Max. memory is 8.0 GB. [2021-05-02 11:51:19,255 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.09 ms. Allocated memory is still 191.9 MB. Free memory is still 171.7 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 130.20 ms. Allocated memory is still 191.9 MB. Free memory was 155.3 MB in the beginning and 145.9 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 35.15 ms. Allocated memory is still 191.9 MB. Free memory was 145.9 MB in the beginning and 174.0 MB in the end (delta: -28.1 MB). Peak memory consumption was 3.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 224.17 ms. Allocated memory is still 191.9 MB. Free memory was 174.0 MB in the beginning and 160.2 MB in the end (delta: 13.7 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 3618.47 ms. Allocated memory was 191.9 MB in the beginning and 230.7 MB in the end (delta: 38.8 MB). Free memory was 159.7 MB in the beginning and 132.7 MB in the end (delta: 27.0 MB). Peak memory consumption was 66.8 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 17]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 23 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 3423.6ms, OverallIterations: 4, TraceHistogramMax: 4, EmptinessCheckTime: 6.5ms, AutomataDifference: 1437.8ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 140.3ms, InitialAbstractionConstructionTime: 7.2ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 38 SDtfs, 65 SDslu, 159 SDs, 0 SdLazy, 408 SolverSat, 59 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 262.9ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 134 GetRequests, 39 SyntacticMatches, 2 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 659 ImplicationChecksByTransitivity, 1570.3ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=21occurred in iteration=3, InterpolantAutomatonStates: 51, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 21.3ms AutomataMinimizationTime, 4 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0ms HoareAnnotationTime, 7 LocationsWithAnnotation, 13 PreInvPairs, 24 NumberOfFragments, 76 HoareAnnotationTreeSize, 13 FomulaSimplifications, 102 FormulaSimplificationTreeSizeReduction, 43.1ms HoareSimplificationTime, 7 FomulaSimplificationsInter, 517 FormulaSimplificationTreeSizeReductionInter, 91.1ms HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 27.1ms SsaConstructionTime, 83.0ms SatisfiabilityAnalysisTime, 1038.5ms InterpolantComputationTime, 112 NumberOfCodeBlocks, 112 NumberOfCodeBlocksAsserted, 12 NumberOfCheckSat, 105 ConstructedInterpolants, 0 QuantifiedInterpolants, 729 SizeOfPredicates, 6 NumberOfNonLiveVariables, 272 ConjunctsInSsa, 61 ConjunctsInUnsatCore, 7 InterpolantComputations, 1 PerfectInterpolantSequences, 4/42 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 - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 25]: Loop Invariant Derived loop invariant: ((2 * i <= sn + 2 && sn + 2 <= 2 * i) && sn < 2 * n + 1) || (sn == 0 && i == 1) RESULT: Ultimate proved your program to be correct! Received shutdown request...