/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/nla-digbench-scaling/ps3-ll_unwindbound1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 16:39:40,528 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 16:39:40,530 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 16:39:40,559 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 16:39:40,576 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 16:39:40,577 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 16:39:40,578 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 16:39:40,580 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 16:39:40,581 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 16:39:40,582 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 16:39:40,584 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 16:39:40,588 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 16:39:40,588 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 16:39:40,589 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 16:39:40,590 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 16:39:40,591 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 16:39:40,596 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 16:39:40,602 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 16:39:40,603 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 16:39:40,604 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 16:39:40,607 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 16:39:40,634 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 16:39:40,635 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 16:39:40,637 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 16:39:40,637 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 16:39:40,637 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 16:39:40,637 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 16:39:40,637 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 16:39:40,637 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 16:39:40,637 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 16:39:40,638 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 16:39:40,648 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 16:39:40,648 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 16:39:40,648 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 16:39:40,648 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 16:39:40,648 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 16:39:40,648 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 16:39:40,648 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 16:39:40,649 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 16:39:40,649 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 16:39:40,649 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 16:39:40,649 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 16:39:40,649 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 16:39:40,649 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 16:39:40,650 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 16:39:40,650 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 16:39:40,650 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 16:39:40,650 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 16:39:40,650 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 16:39:40,650 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 16:39:40,884 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 16:39:40,898 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 16:39:40,900 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 16:39:40,900 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 16:39:40,904 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 16:39:40,905 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/ps3-ll_unwindbound1.c [2021-05-02 16:39:40,962 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ebc288b6c/164ae6f8cbf54e46ad49de7b5b968a6d/FLAG752773499 [2021-05-02 16:39:41,279 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 16:39:41,280 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/ps3-ll_unwindbound1.c [2021-05-02 16:39:41,284 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ebc288b6c/164ae6f8cbf54e46ad49de7b5b968a6d/FLAG752773499 [2021-05-02 16:39:41,706 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ebc288b6c/164ae6f8cbf54e46ad49de7b5b968a6d [2021-05-02 16:39:41,708 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 16:39:41,709 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 16:39:41,710 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 16:39:41,710 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 16:39:41,714 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 16:39:41,715 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 04:39:41" (1/1) ... [2021-05-02 16:39:41,716 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4970902c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:39:41, skipping insertion in model container [2021-05-02 16:39:41,716 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 04:39:41" (1/1) ... [2021-05-02 16:39:41,721 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 16:39:41,730 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 16:39:41,813 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/ps3-ll_unwindbound1.c[458,471] [2021-05-02 16:39:41,824 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 16:39:41,829 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 16:39:41,836 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/ps3-ll_unwindbound1.c[458,471] [2021-05-02 16:39:41,839 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 16:39:41,848 INFO L208 MainTranslator]: Completed translation [2021-05-02 16:39:41,848 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:39:41 WrapperNode [2021-05-02 16:39:41,848 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 16:39:41,849 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 16:39:41,849 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 16:39:41,849 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 16:39:41,885 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:39:41" (1/1) ... [2021-05-02 16:39:41,886 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:39:41" (1/1) ... [2021-05-02 16:39:41,890 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:39:41" (1/1) ... [2021-05-02 16:39:41,890 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:39:41" (1/1) ... [2021-05-02 16:39:41,901 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:39:41" (1/1) ... [2021-05-02 16:39:41,905 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:39:41" (1/1) ... [2021-05-02 16:39:41,906 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:39:41" (1/1) ... [2021-05-02 16:39:41,908 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 16:39:41,909 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 16:39:41,909 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 16:39:41,909 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 16:39:41,910 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:39:41" (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 16:39:41,953 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 16:39:41,953 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 16:39:41,953 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 16:39:41,953 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 16:39:41,953 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 16:39:41,954 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 16:39:41,954 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 16:39:41,954 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 16:39:41,955 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 16:39:41,955 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 16:39:41,955 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_short [2021-05-02 16:39:41,955 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 16:39:41,956 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 16:39:41,956 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 16:39:41,958 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 16:39:41,958 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 16:39:41,958 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 16:39:41,958 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 16:39:41,958 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 16:39:41,958 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 16:39:42,145 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 16:39:42,145 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 16:39:42,146 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 04:39:42 BoogieIcfgContainer [2021-05-02 16:39:42,146 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 16:39:42,147 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 16:39:42,147 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 16:39:42,149 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 16:39:42,149 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 04:39:41" (1/3) ... [2021-05-02 16:39:42,149 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15fd80ab and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 04:39:42, skipping insertion in model container [2021-05-02 16:39:42,149 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:39:41" (2/3) ... [2021-05-02 16:39:42,150 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15fd80ab and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 04:39:42, skipping insertion in model container [2021-05-02 16:39:42,150 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 04:39:42" (3/3) ... [2021-05-02 16:39:42,151 INFO L111 eAbstractionObserver]: Analyzing ICFG ps3-ll_unwindbound1.c [2021-05-02 16:39:42,154 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 16:39:42,157 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 16:39:42,167 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 16:39:42,195 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 16:39:42,196 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 16:39:42,196 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 16:39:42,196 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 16:39:42,196 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 16:39:42,196 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 16:39:42,196 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 16:39:42,196 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 16:39:42,221 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 16:39:42,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 16:39:42,224 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:39:42,224 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:39:42,225 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:39:42,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:39:42,228 INFO L82 PathProgramCache]: Analyzing trace with hash 1665267581, now seen corresponding path program 1 times [2021-05-02 16:39:42,234 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:39:42,234 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1091115722] [2021-05-02 16:39:42,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:39:42,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:39:42,423 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 16:39:42,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:39:42,446 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 16:39:42,447 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:39:42,447 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1091115722] [2021-05-02 16:39:42,448 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1091115722] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 16:39:42,448 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 16:39:42,448 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 16:39:42,449 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1811223867] [2021-05-02 16:39:42,451 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 16:39:42,452 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:39:42,462 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 16:39:42,463 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 16:39:42,464 INFO L87 Difference]: Start difference. First operand has 22 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 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 16:39:42,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:39:42,524 INFO L93 Difference]: Finished difference Result 39 states and 50 transitions. [2021-05-02 16:39:42,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 16:39:42,526 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 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 11 [2021-05-02 16:39:42,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:39:42,531 INFO L225 Difference]: With dead ends: 39 [2021-05-02 16:39:42,531 INFO L226 Difference]: Without dead ends: 18 [2021-05-02 16:39:42,534 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 39.5ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 16:39:42,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-05-02 16:39:42,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2021-05-02 16:39:42,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 10 states have (on average 1.3) internal successors, (13), 11 states have internal predecessors, (13), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 16:39:42,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2021-05-02 16:39:42,564 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 11 [2021-05-02 16:39:42,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:39:42,564 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2021-05-02 16:39:42,565 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 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 16:39:42,565 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2021-05-02 16:39:42,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-02 16:39:42,566 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:39:42,566 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:39:42,566 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 16:39:42,566 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:39:42,567 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:39:42,567 INFO L82 PathProgramCache]: Analyzing trace with hash -318583316, now seen corresponding path program 1 times [2021-05-02 16:39:42,567 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:39:42,567 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [677842922] [2021-05-02 16:39:42,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:39:42,596 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:39:42,597 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [885620540] [2021-05-02 16:39:42,597 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 16:39:42,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:39:42,654 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 16:39:42,658 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 16:39:42,692 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:39:42,701 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:39:42,704 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:39:42,733 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:39:42,739 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:39:42,758 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 16:39:42,759 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:39:42,759 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [677842922] [2021-05-02 16:39:42,759 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 16:39:42,759 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [885620540] [2021-05-02 16:39:42,760 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [885620540] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 16:39:42,760 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 16:39:42,760 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 16:39:42,760 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [959828026] [2021-05-02 16:39:42,761 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 16:39:42,761 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:39:42,764 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 16:39:42,764 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 16:39:42,765 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 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 16:39:42,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:39:42,778 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2021-05-02 16:39:42,778 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 16:39:42,778 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 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) Word has length 12 [2021-05-02 16:39:42,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:39:42,779 INFO L225 Difference]: With dead ends: 26 [2021-05-02 16:39:42,779 INFO L226 Difference]: Without dead ends: 19 [2021-05-02 16:39:42,780 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.0ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 16:39:42,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-05-02 16:39:42,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-05-02 16:39:42,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 12 states have (on average 1.25) internal successors, (15), 13 states have internal predecessors, (15), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 16:39:42,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2021-05-02 16:39:42,790 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 12 [2021-05-02 16:39:42,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:39:42,792 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2021-05-02 16:39:42,792 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 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 16:39:42,792 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2021-05-02 16:39:42,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-02 16:39:42,793 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:39:42,793 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:39:42,998 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-02 16:39:42,999 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:39:43,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:39:43,000 INFO L82 PathProgramCache]: Analyzing trace with hash -316795856, now seen corresponding path program 1 times [2021-05-02 16:39:43,000 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:39:43,000 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [916660306] [2021-05-02 16:39:43,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:39:43,009 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:39:43,009 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [60286219] [2021-05-02 16:39:43,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 16:39:43,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:39:43,055 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 16:39:43,056 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 16:39:43,088 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 16:39:43,088 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:39:43,088 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [916660306] [2021-05-02 16:39:43,088 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 16:39:43,088 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [60286219] [2021-05-02 16:39:43,088 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [60286219] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 16:39:43,088 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 16:39:43,089 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 16:39:43,089 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [86988977] [2021-05-02 16:39:43,089 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 16:39:43,089 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:39:43,089 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 16:39:43,089 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-02 16:39:43,090 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 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 16:39:43,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:39:43,109 INFO L93 Difference]: Finished difference Result 28 states and 31 transitions. [2021-05-02 16:39:43,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 16:39:43,110 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 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 16:39:43,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:39:43,110 INFO L225 Difference]: With dead ends: 28 [2021-05-02 16:39:43,110 INFO L226 Difference]: Without dead ends: 25 [2021-05-02 16:39:43,111 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 13.2ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 16:39:43,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-05-02 16:39:43,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2021-05-02 16:39:43,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 16 states have (on average 1.1875) internal successors, (19), 17 states have internal predecessors, (19), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 16:39:43,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2021-05-02 16:39:43,114 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 12 [2021-05-02 16:39:43,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:39:43,115 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2021-05-02 16:39:43,115 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 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 16:39:43,115 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2021-05-02 16:39:43,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 16:39:43,115 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:39:43,115 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:39:43,328 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 16:39:43,331 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:39:43,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:39:43,331 INFO L82 PathProgramCache]: Analyzing trace with hash -2089867248, now seen corresponding path program 1 times [2021-05-02 16:39:43,331 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:39:43,332 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1367573181] [2021-05-02 16:39:43,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:39:43,341 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:39:43,341 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1108273763] [2021-05-02 16:39:43,342 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 [2021-05-02 16:39:43,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:39:43,380 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 16:39:43,381 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 16:39:43,445 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 16:39:43,446 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:39:43,446 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1367573181] [2021-05-02 16:39:43,446 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 16:39:43,446 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1108273763] [2021-05-02 16:39:43,446 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1108273763] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 16:39:43,446 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 16:39:43,446 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 16:39:43,446 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [144904282] [2021-05-02 16:39:43,447 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 16:39:43,447 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:39:43,447 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 16:39:43,447 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-05-02 16:39:43,447 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand has 8 states, 8 states have (on average 1.75) internal successors, (14), 7 states have internal predecessors, (14), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 16:39:43,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:39:43,498 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2021-05-02 16:39:43,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 16:39:43,499 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.75) internal successors, (14), 7 states have internal predecessors, (14), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2021-05-02 16:39:43,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:39:43,499 INFO L225 Difference]: With dead ends: 36 [2021-05-02 16:39:43,499 INFO L226 Difference]: Without dead ends: 33 [2021-05-02 16:39:43,500 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 38.2ms TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-05-02 16:39:43,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-02 16:39:43,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-05-02 16:39:43,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 23 states have internal predecessors, (25), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 16:39:43,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2021-05-02 16:39:43,504 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 20 [2021-05-02 16:39:43,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:39:43,504 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2021-05-02 16:39:43,504 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 1.75) internal successors, (14), 7 states have internal predecessors, (14), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 16:39:43,504 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2021-05-02 16:39:43,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-02 16:39:43,505 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:39:43,505 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:39:43,721 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 16:39:43,721 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:39:43,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:39:43,722 INFO L82 PathProgramCache]: Analyzing trace with hash -696181196, now seen corresponding path program 2 times [2021-05-02 16:39:43,722 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:39:43,722 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1139015528] [2021-05-02 16:39:43,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:39:43,731 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:39:43,731 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2105293201] [2021-05-02 16:39:43,731 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 [2021-05-02 16:39:43,777 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 16:39:43,777 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 16:39:43,778 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 16:39:43,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 16:39:43,788 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:39:43,790 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:39:43,790 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:39:43,795 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:39:43,811 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:39:43,812 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:39:43,827 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:39:43,829 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:39:43,846 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 13 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 16:39:43,846 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:39:43,846 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1139015528] [2021-05-02 16:39:43,847 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 16:39:43,847 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2105293201] [2021-05-02 16:39:43,847 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2105293201] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 16:39:43,847 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 16:39:43,847 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2021-05-02 16:39:43,847 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [378065043] [2021-05-02 16:39:43,847 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 16:39:43,847 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:39:43,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 16:39:43,848 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 16:39:43,848 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand has 5 states, 5 states have (on average 3.8) internal successors, (19), 4 states have internal predecessors, (19), 4 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 16:39:43,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:39:43,865 INFO L93 Difference]: Finished difference Result 33 states and 35 transitions. [2021-05-02 16:39:43,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 16:39:43,866 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 4 states have internal predecessors, (19), 4 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 28 [2021-05-02 16:39:43,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:39:43,866 INFO L225 Difference]: With dead ends: 33 [2021-05-02 16:39:43,866 INFO L226 Difference]: Without dead ends: 0 [2021-05-02 16:39:43,866 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 11.1ms TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-05-02 16:39:43,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-05-02 16:39:43,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-05-02 16:39:43,867 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 16:39:43,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-05-02 16:39:43,867 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 28 [2021-05-02 16:39:43,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:39:43,867 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-05-02 16:39:43,867 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 4 states have internal predecessors, (19), 4 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 16:39:43,867 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-05-02 16:39:43,868 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-05-02 16:39:44,074 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 16:39:44,076 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2021-05-02 16:39:44,191 INFO L198 CegarLoopUtils]: For program point reach_errorEXIT(line 3) no Hoare annotation was computed. [2021-05-02 16:39:44,191 INFO L198 CegarLoopUtils]: For program point reach_errorENTRY(line 3) no Hoare annotation was computed. [2021-05-02 16:39:44,191 INFO L198 CegarLoopUtils]: For program point reach_errorFINAL(line 3) no Hoare annotation was computed. [2021-05-02 16:39:44,191 INFO L198 CegarLoopUtils]: For program point ULTIMATE.initFINAL(line -1) no Hoare annotation was computed. [2021-05-02 16:39:44,192 INFO L194 CegarLoopUtils]: At program point ULTIMATE.initENTRY(line -1) the Hoare annotation is: (and (= |#t~string5.base| |old(#t~string5.base)|) (= |#t~string5.offset| |old(#t~string5.offset)|) (= |old(#length)| |#length|) (= |#t~string6.base| |old(#t~string6.base)|) (= |#t~string6.offset| |old(#t~string6.offset)|) (= |#t~string4.base| |old(#t~string4.base)|) (= |#NULL.base| |old(#NULL.base)|) (= ~counter~0 |old(~counter~0)|) (= |#t~string4.offset| |old(#t~string4.offset)|) (= |#NULL.offset| |old(#NULL.offset)|) (= |old(#valid)| |#valid|)) [2021-05-02 16:39:44,192 INFO L198 CegarLoopUtils]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2021-05-02 16:39:44,192 INFO L198 CegarLoopUtils]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2021-05-02 16:39:44,192 INFO L194 CegarLoopUtils]: At program point L-1(line -1) the Hoare annotation is: (and (<= ~counter~0 0) (<= 0 ~counter~0)) [2021-05-02 16:39:44,192 INFO L201 CegarLoopUtils]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2021-05-02 16:39:44,192 INFO L198 CegarLoopUtils]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2021-05-02 16:39:44,192 INFO L198 CegarLoopUtils]: For program point assume_abort_if_notENTRY(lines 6 8) no Hoare annotation was computed. [2021-05-02 16:39:44,192 INFO L198 CegarLoopUtils]: For program point L7(line 7) no Hoare annotation was computed. [2021-05-02 16:39:44,192 INFO L198 CegarLoopUtils]: For program point L7-2(lines 6 8) no Hoare annotation was computed. [2021-05-02 16:39:44,192 INFO L198 CegarLoopUtils]: For program point assume_abort_if_notEXIT(lines 6 8) no Hoare annotation was computed. [2021-05-02 16:39:44,192 INFO L194 CegarLoopUtils]: At program point mainENTRY(lines 18 39) the Hoare annotation is: (or (not (<= |old(~counter~0)| 0)) (not (<= 0 |old(~counter~0)|)) (= ~counter~0 |old(~counter~0)|)) [2021-05-02 16:39:44,193 INFO L194 CegarLoopUtils]: At program point L28(line 28) the Hoare annotation is: (or (not (<= |old(~counter~0)| 0)) (and (<= 1 ~counter~0) (= main_~y~0 0) (= main_~x~0 0)) (not (<= 0 |old(~counter~0)|))) [2021-05-02 16:39:44,193 INFO L198 CegarLoopUtils]: For program point L28-1(lines 27 36) no Hoare annotation was computed. [2021-05-02 16:39:44,193 INFO L198 CegarLoopUtils]: For program point L27-1(lines 27 36) no Hoare annotation was computed. [2021-05-02 16:39:44,193 INFO L198 CegarLoopUtils]: For program point mainEXIT(lines 18 39) no Hoare annotation was computed. [2021-05-02 16:39:44,193 INFO L194 CegarLoopUtils]: At program point L27-3(lines 27 36) the Hoare annotation is: (or (not (<= |old(~counter~0)| 0)) (and (= main_~y~0 0) (<= ~counter~0 0) (= main_~x~0 0) (<= 0 ~counter~0)) (not (<= 0 |old(~counter~0)|)) (and (<= 1 ~counter~0) (= (* main_~y~0 main_~y~0) main_~x~0) (= main_~y~0 1))) [2021-05-02 16:39:44,193 INFO L194 CegarLoopUtils]: At program point L27-4(lines 27 36) the Hoare annotation is: (or (not (<= |old(~counter~0)| 0)) (and (= (* main_~y~0 main_~y~0) main_~x~0) (= main_~y~0 1)) (and (= main_~y~0 0) (= main_~x~0 0)) (not (<= 0 |old(~counter~0)|))) [2021-05-02 16:39:44,193 INFO L198 CegarLoopUtils]: For program point mainFINAL(lines 18 39) no Hoare annotation was computed. [2021-05-02 16:39:44,193 INFO L198 CegarLoopUtils]: For program point L37(line 37) no Hoare annotation was computed. [2021-05-02 16:39:44,193 INFO L201 CegarLoopUtils]: At program point __VERIFIER_assertENTRY(lines 9 15) the Hoare annotation is: true [2021-05-02 16:39:44,193 INFO L198 CegarLoopUtils]: For program point L11(lines 11 12) no Hoare annotation was computed. [2021-05-02 16:39:44,193 INFO L198 CegarLoopUtils]: For program point L10(lines 10 13) no Hoare annotation was computed. [2021-05-02 16:39:44,193 INFO L198 CegarLoopUtils]: For program point __VERIFIER_assertEXIT(lines 9 15) no Hoare annotation was computed. [2021-05-02 16:39:44,193 INFO L198 CegarLoopUtils]: For program point L10-2(lines 9 15) no Hoare annotation was computed. [2021-05-02 16:39:44,194 INFO L198 CegarLoopUtils]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 12) no Hoare annotation was computed. [2021-05-02 16:39:44,203 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 04:39:44 BoogieIcfgContainer [2021-05-02 16:39:44,203 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-02 16:39:44,204 INFO L168 Benchmark]: Toolchain (without parser) took 2495.26 ms. Allocated memory was 211.8 MB in the beginning and 254.8 MB in the end (delta: 43.0 MB). Free memory was 177.1 MB in the beginning and 197.0 MB in the end (delta: -20.0 MB). Peak memory consumption was 24.2 MB. Max. memory is 8.0 GB. [2021-05-02 16:39:44,204 INFO L168 Benchmark]: CDTParser took 0.10 ms. Allocated memory is still 211.8 MB. Free memory is still 193.5 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 16:39:44,204 INFO L168 Benchmark]: CACSL2BoogieTranslator took 138.52 ms. Allocated memory is still 211.8 MB. Free memory was 176.9 MB in the beginning and 167.2 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2021-05-02 16:39:44,204 INFO L168 Benchmark]: Boogie Preprocessor took 59.65 ms. Allocated memory is still 211.8 MB. Free memory was 167.2 MB in the beginning and 195.2 MB in the end (delta: -28.0 MB). Peak memory consumption was 4.2 MB. Max. memory is 8.0 GB. [2021-05-02 16:39:44,204 INFO L168 Benchmark]: RCFGBuilder took 236.92 ms. Allocated memory is still 211.8 MB. Free memory was 195.2 MB in the beginning and 181.1 MB in the end (delta: 14.1 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. [2021-05-02 16:39:44,205 INFO L168 Benchmark]: TraceAbstraction took 2056.69 ms. Allocated memory was 211.8 MB in the beginning and 254.8 MB in the end (delta: 43.0 MB). Free memory was 180.5 MB in the beginning and 197.0 MB in the end (delta: -16.5 MB). Peak memory consumption was 27.4 MB. Max. memory is 8.0 GB. [2021-05-02 16:39:44,205 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.10 ms. Allocated memory is still 211.8 MB. Free memory is still 193.5 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 138.52 ms. Allocated memory is still 211.8 MB. Free memory was 176.9 MB in the beginning and 167.2 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 59.65 ms. Allocated memory is still 211.8 MB. Free memory was 167.2 MB in the beginning and 195.2 MB in the end (delta: -28.0 MB). Peak memory consumption was 4.2 MB. Max. memory is 8.0 GB. * RCFGBuilder took 236.92 ms. Allocated memory is still 211.8 MB. Free memory was 195.2 MB in the beginning and 181.1 MB in the end (delta: 14.1 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 2056.69 ms. Allocated memory was 211.8 MB in the beginning and 254.8 MB in the end (delta: 43.0 MB). Free memory was 180.5 MB in the beginning and 197.0 MB in the end (delta: -16.5 MB). Peak memory consumption was 27.4 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 12]: 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 6 procedures, 29 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 1881.5ms, OverallIterations: 5, TraceHistogramMax: 3, EmptinessCheckTime: 23.2ms, AutomataDifference: 193.4ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 115.4ms, InitialAbstractionConstructionTime: 7.3ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 85 SDtfs, 30 SDslu, 176 SDs, 0 SdLazy, 100 SolverSat, 10 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 71.3ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 76 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 107.2ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=33occurred in iteration=4, InterpolantAutomatonStates: 25, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 38.2ms AutomataMinimizationTime, 5 MinimizatonAttempts, 1 StatesRemovedByMinimization, 1 NontrivialMinimizations, HoareAnnotationStatistics: 0.0ms HoareAnnotationTime, 8 LocationsWithAnnotation, 16 PreInvPairs, 21 NumberOfFragments, 133 HoareAnnotationTreeSize, 16 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 30.5ms HoareSimplificationTime, 8 FomulaSimplificationsInter, 128 FormulaSimplificationTreeSizeReductionInter, 78.2ms HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 30.8ms SsaConstructionTime, 105.3ms SatisfiabilityAnalysisTime, 393.8ms InterpolantComputationTime, 83 NumberOfCodeBlocks, 83 NumberOfCodeBlocksAsserted, 6 NumberOfCheckSat, 78 ConstructedInterpolants, 0 QuantifiedInterpolants, 233 SizeOfPredicates, 6 NumberOfNonLiveVariables, 483 ConjunctsInSsa, 41 ConjunctsInUnsatCore, 5 InterpolantComputations, 3 PerfectInterpolantSequences, 16/20 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: 27]: Loop Invariant Derived loop invariant: ((!(\old(counter) <= 0) || (((y == 0 && counter <= 0) && x == 0) && 0 <= counter)) || !(0 <= \old(counter))) || ((1 <= counter && y * y == x) && y == 1) RESULT: Ultimate proved your program to be correct! Received shutdown request...