/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/ludcmp.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 11:49:55,921 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 11:49:55,923 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 11:49:55,952 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 11:49:55,975 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 11:49:55,977 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 11:49:55,978 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 11:49:55,979 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 11:49:55,981 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 11:49:55,981 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 11:49:55,983 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 11:49:55,987 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 11:49:55,988 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 11:49:55,990 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 11:49:55,991 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 11:49:55,992 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 11:49:55,997 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 11:49:56,002 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 11:49:56,003 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 11:49:56,003 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 11:49:56,007 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 11:49:56,035 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 11:49:56,035 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 11:49:56,037 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 11:49:56,037 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 11:49:56,037 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 11:49:56,038 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 11:49:56,038 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 11:49:56,038 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 11:49:56,038 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 11:49:56,038 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 11:49:56,039 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 11:49:56,039 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 11:49:56,039 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 11:49:56,039 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 11:49:56,039 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 11:49:56,039 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 11:49:56,039 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 11:49:56,039 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 11:49:56,040 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 11:49:56,040 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 11:49:56,040 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 11:49:56,040 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 11:49:56,040 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 11:49:56,040 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 11:49:56,040 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 11:49:56,040 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 11:49:56,041 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 11:49:56,041 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 11:49:56,041 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 11:49:56,289 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 11:49:56,315 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 11:49:56,317 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 11:49:56,318 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 11:49:56,319 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 11:49:56,319 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/ludcmp.c [2021-05-02 11:49:56,366 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/362653669/6c5cccac97e6487dba166fe2577c815e/FLAG7f387b462 [2021-05-02 11:49:56,719 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 11:49:56,719 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/ludcmp.c [2021-05-02 11:49:56,725 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/362653669/6c5cccac97e6487dba166fe2577c815e/FLAG7f387b462 [2021-05-02 11:49:56,739 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/362653669/6c5cccac97e6487dba166fe2577c815e [2021-05-02 11:49:56,741 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 11:49:56,743 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 11:49:56,746 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 11:49:56,746 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 11:49:56,749 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 11:49:56,750 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 11:49:56" (1/1) ... [2021-05-02 11:49:56,750 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@48be9d69 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:56, skipping insertion in model container [2021-05-02 11:49:56,751 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 11:49:56" (1/1) ... [2021-05-02 11:49:56,755 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 11:49:56,775 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 11:49:56,884 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/ludcmp.c[318,331] [2021-05-02 11:49:56,954 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 11:49:56,959 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 11:49:56,969 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/ludcmp.c[318,331] [2021-05-02 11:49:57,002 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 11:49:57,011 INFO L208 MainTranslator]: Completed translation [2021-05-02 11:49:57,012 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:57 WrapperNode [2021-05-02 11:49:57,012 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 11:49:57,013 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 11:49:57,014 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 11:49:57,015 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 11:49:57,022 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:57" (1/1) ... [2021-05-02 11:49:57,023 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:57" (1/1) ... [2021-05-02 11:49:57,037 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:57" (1/1) ... [2021-05-02 11:49:57,037 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:57" (1/1) ... [2021-05-02 11:49:57,052 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:57" (1/1) ... [2021-05-02 11:49:57,057 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:57" (1/1) ... [2021-05-02 11:49:57,058 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:57" (1/1) ... [2021-05-02 11:49:57,060 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 11:49:57,066 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 11:49:57,066 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 11:49:57,066 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 11:49:57,067 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:57" (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 11:49:57,115 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 11:49:57,115 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 11:49:57,115 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 11:49:57,116 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 11:49:57,116 INFO L138 BoogieDeclarations]: Found implementation of procedure fabs [2021-05-02 11:49:57,116 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 11:49:57,116 INFO L138 BoogieDeclarations]: Found implementation of procedure ludcmp [2021-05-02 11:49:57,116 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 11:49:57,116 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 11:49:57,117 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 11:49:57,117 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 11:49:57,117 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 11:49:57,117 INFO L130 BoogieDeclarations]: Found specification of procedure ludcmp [2021-05-02 11:49:57,117 INFO L130 BoogieDeclarations]: Found specification of procedure fabs [2021-05-02 11:49:57,118 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 11:49:57,118 INFO L130 BoogieDeclarations]: Found specification of procedure write~real [2021-05-02 11:49:57,118 INFO L130 BoogieDeclarations]: Found specification of procedure read~real [2021-05-02 11:49:57,118 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 11:49:57,118 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 11:49:57,118 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 11:49:57,118 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 11:49:57,118 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 11:49:57,118 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 11:49:57,427 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 11:49:57,427 INFO L299 CfgBuilder]: Removed 11 assume(true) statements. [2021-05-02 11:49:57,428 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 11:49:57 BoogieIcfgContainer [2021-05-02 11:49:57,428 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 11:49:57,429 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 11:49:57,430 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 11:49:57,432 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 11:49:57,432 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 11:49:56" (1/3) ... [2021-05-02 11:49:57,432 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4491d81a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 11:49:57, skipping insertion in model container [2021-05-02 11:49:57,432 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:57" (2/3) ... [2021-05-02 11:49:57,433 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4491d81a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 11:49:57, skipping insertion in model container [2021-05-02 11:49:57,433 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 11:49:57" (3/3) ... [2021-05-02 11:49:57,434 INFO L111 eAbstractionObserver]: Analyzing ICFG ludcmp.c [2021-05-02 11:49:57,437 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 11:49:57,440 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 11:49:57,450 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 11:49:57,464 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 11:49:57,465 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 11:49:57,465 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 11:49:57,465 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 11:49:57,465 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 11:49:57,465 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 11:49:57,465 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 11:49:57,465 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 11:49:57,476 INFO L276 IsEmpty]: Start isEmpty. Operand has 64 states, 52 states have (on average 1.5576923076923077) internal successors, (81), 53 states have internal predecessors, (81), 5 states have call successors, (5), 5 states have call predecessors, (5), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 11:49:57,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-02 11:49:57,479 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:57,479 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:57,479 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:57,482 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:57,483 INFO L82 PathProgramCache]: Analyzing trace with hash 1448102218, now seen corresponding path program 1 times [2021-05-02 11:49:57,488 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:57,488 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [691168116] [2021-05-02 11:49:57,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:57,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:57,652 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:57,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:57,665 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 11:49:57,665 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:57,665 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [691168116] [2021-05-02 11:49:57,666 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [691168116] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 11:49:57,666 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 11:49:57,666 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 11:49:57,666 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1370340670] [2021-05-02 11:49:57,669 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 11:49:57,669 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:49:57,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 11:49:57,676 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 11:49:57,678 INFO L87 Difference]: Start difference. First operand has 64 states, 52 states have (on average 1.5576923076923077) internal successors, (81), 53 states have internal predecessors, (81), 5 states have call successors, (5), 5 states have call predecessors, (5), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 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 11:49:57,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:49:57,813 INFO L93 Difference]: Finished difference Result 127 states and 191 transitions. [2021-05-02 11:49:57,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 11:49:57,814 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 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 11:49:57,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:49:57,819 INFO L225 Difference]: With dead ends: 127 [2021-05-02 11:49:57,820 INFO L226 Difference]: Without dead ends: 24 [2021-05-02 11:49:57,823 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 35.1ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 11:49:57,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-05-02 11:49:57,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 20. [2021-05-02 11:49:57,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 11:49:57,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2021-05-02 11:49:57,853 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 12 [2021-05-02 11:49:57,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:49:57,853 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2021-05-02 11:49:57,853 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 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 11:49:57,853 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2021-05-02 11:49:57,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-02 11:49:57,854 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:57,854 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:57,855 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 11:49:57,855 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:57,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:57,856 INFO L82 PathProgramCache]: Analyzing trace with hash 1436096445, now seen corresponding path program 1 times [2021-05-02 11:49:57,856 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:57,856 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [826669517] [2021-05-02 11:49:57,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:57,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:57,959 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:57,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:58,009 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 11:49:58,010 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:58,010 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [826669517] [2021-05-02 11:49:58,010 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [826669517] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 11:49:58,010 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 11:49:58,010 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 11:49:58,011 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [217043475] [2021-05-02 11:49:58,012 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 11:49:58,012 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:49:58,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 11:49:58,017 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 11:49:58,017 INFO L87 Difference]: Start difference. First operand 20 states and 22 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), 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 11:49:58,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:49:58,229 INFO L93 Difference]: Finished difference Result 40 states and 47 transitions. [2021-05-02 11:49:58,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 11:49:58,230 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), 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 11:49:58,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:49:58,234 INFO L225 Difference]: With dead ends: 40 [2021-05-02 11:49:58,238 INFO L226 Difference]: Without dead ends: 26 [2021-05-02 11:49:58,250 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 122.8ms TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-05-02 11:49:58,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-05-02 11:49:58,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 21. [2021-05-02 11:49:58,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 15 states have (on average 1.2) internal successors, (18), 15 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 11:49:58,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2021-05-02 11:49:58,258 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 12 [2021-05-02 11:49:58,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:49:58,258 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2021-05-02 11:49:58,258 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), 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 11:49:58,258 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2021-05-02 11:49:58,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-05-02 11:49:58,259 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:58,259 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:58,259 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 11:49:58,259 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:58,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:58,259 INFO L82 PathProgramCache]: Analyzing trace with hash 1858105272, now seen corresponding path program 1 times [2021-05-02 11:49:58,259 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:58,260 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2037459789] [2021-05-02 11:49:58,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:58,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:58,409 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:58,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:58,418 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 11:49:58,418 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:58,418 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2037459789] [2021-05-02 11:49:58,418 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2037459789] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:58,418 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [667910446] [2021-05-02 11:49:58,419 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 11:49:58,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:58,488 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 11:49:58,491 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:49:58,543 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:58,548 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:58,568 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:58,581 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 11:49:58,582 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [667910446] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:58,582 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:49:58,583 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 8 [2021-05-02 11:49:58,583 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1676649800] [2021-05-02 11:49:58,583 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 11:49:58,583 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:49:58,584 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 11:49:58,584 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-02 11:49:58,585 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:58,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:49:58,707 INFO L93 Difference]: Finished difference Result 45 states and 52 transitions. [2021-05-02 11:49:58,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 11:49:58,707 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 2 states have call successors, (4), 3 states have call predecessors, (4), 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 11:49:58,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:49:58,708 INFO L225 Difference]: With dead ends: 45 [2021-05-02 11:49:58,708 INFO L226 Difference]: Without dead ends: 30 [2021-05-02 11:49:58,708 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 120.9ms TimeCoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2021-05-02 11:49:58,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-02 11:49:58,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2021-05-02 11:49:58,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 19 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 11:49:58,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2021-05-02 11:49:58,718 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 16 [2021-05-02 11:49:58,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:49:58,718 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2021-05-02 11:49:58,718 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:58,718 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2021-05-02 11:49:58,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 11:49:58,719 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:58,719 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:58,934 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 11:49:58,935 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:58,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:58,940 INFO L82 PathProgramCache]: Analyzing trace with hash 1949651507, now seen corresponding path program 2 times [2021-05-02 11:49:58,940 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:58,940 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [499803156] [2021-05-02 11:49:58,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:58,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:59,013 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:59,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:59,018 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:49:59,018 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:59,018 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [499803156] [2021-05-02 11:49:59,019 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [499803156] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:59,019 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [800651072] [2021-05-02 11:49:59,019 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 11:49:59,067 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 11:49:59,068 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:49:59,068 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 11:49:59,069 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:49:59,093 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:59,095 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:59,106 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:59,114 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:49:59,114 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [800651072] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 11:49:59,115 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 11:49:59,115 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 9 [2021-05-02 11:49:59,115 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [937536135] [2021-05-02 11:49:59,115 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 11:49:59,115 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:49:59,115 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 11:49:59,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2021-05-02 11:49:59,116 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand has 5 states, 5 states have (on average 3.2) internal successors, (16), 5 states have internal predecessors, (16), 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 11:49:59,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:49:59,144 INFO L93 Difference]: Finished difference Result 57 states and 67 transitions. [2021-05-02 11:49:59,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 11:49:59,145 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 5 states have internal predecessors, (16), 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 20 [2021-05-02 11:49:59,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:49:59,145 INFO L225 Difference]: With dead ends: 57 [2021-05-02 11:49:59,145 INFO L226 Difference]: Without dead ends: 38 [2021-05-02 11:49:59,146 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 48.7ms TimeCoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2021-05-02 11:49:59,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-02 11:49:59,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 35. [2021-05-02 11:49:59,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 29 states have (on average 1.206896551724138) internal successors, (35), 29 states have internal predecessors, (35), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 11:49:59,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 40 transitions. [2021-05-02 11:49:59,150 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 40 transitions. Word has length 20 [2021-05-02 11:49:59,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:49:59,150 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 40 transitions. [2021-05-02 11:49:59,150 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 5 states have internal predecessors, (16), 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 11:49:59,150 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 40 transitions. [2021-05-02 11:49:59,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 11:49:59,150 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:59,151 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:59,367 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:49:59,368 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:59,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:59,369 INFO L82 PathProgramCache]: Analyzing trace with hash 1140304881, now seen corresponding path program 1 times [2021-05-02 11:49:59,369 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:59,369 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1956558873] [2021-05-02 11:49:59,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:59,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:59,435 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:59,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:59,442 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:49:59,443 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:59,443 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1956558873] [2021-05-02 11:49:59,443 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1956558873] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:59,443 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [280888360] [2021-05-02 11:49:59,443 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 11:49:59,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:59,540 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 11:49:59,541 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:49:59,581 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:59,584 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:59,603 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:59,605 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:59,620 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:59,628 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:49:59,628 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [280888360] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:59,628 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:49:59,629 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 10 [2021-05-02 11:49:59,629 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1282771678] [2021-05-02 11:49:59,629 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 11:49:59,629 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:49:59,634 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 11:49:59,634 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2021-05-02 11:49:59,635 INFO L87 Difference]: Start difference. First operand 35 states and 40 transitions. Second operand has 10 states, 10 states have (on average 2.7) internal successors, (27), 9 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:59,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:49:59,759 INFO L93 Difference]: Finished difference Result 68 states and 80 transitions. [2021-05-02 11:49:59,760 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 11:49:59,760 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.7) internal successors, (27), 9 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 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 11:49:59,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:49:59,760 INFO L225 Difference]: With dead ends: 68 [2021-05-02 11:49:59,761 INFO L226 Difference]: Without dead ends: 49 [2021-05-02 11:49:59,761 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 121.2ms TimeCoverageRelationStatistics Valid=50, Invalid=82, Unknown=0, NotChecked=0, Total=132 [2021-05-02 11:49:59,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-02 11:49:59,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 43. [2021-05-02 11:49:59,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 37 states have (on average 1.1891891891891893) internal successors, (44), 37 states have internal predecessors, (44), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 11:49:59,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 49 transitions. [2021-05-02 11:49:59,770 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 49 transitions. Word has length 20 [2021-05-02 11:49:59,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:49:59,770 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 49 transitions. [2021-05-02 11:49:59,770 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.7) internal successors, (27), 9 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:59,770 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 49 transitions. [2021-05-02 11:49:59,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-02 11:49:59,771 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:59,771 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:59,976 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:49:59,977 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:59,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:59,977 INFO L82 PathProgramCache]: Analyzing trace with hash -162258006, now seen corresponding path program 2 times [2021-05-02 11:49:59,977 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:59,978 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [597589788] [2021-05-02 11:49:59,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:59,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:50:00,046 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:50:00,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:50:00,051 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:50:00,051 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:50:00,051 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [597589788] [2021-05-02 11:50:00,051 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [597589788] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:50:00,051 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1137387905] [2021-05-02 11:50:00,051 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 11:50:00,096 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 11:50:00,096 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:50:00,097 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 11:50:00,098 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:50:00,128 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,129 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,145 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,146 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,162 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,164 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,184 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,189 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:50:00,189 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1137387905] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:50:00,189 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:50:00,189 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 12 [2021-05-02 11:50:00,190 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1320589402] [2021-05-02 11:50:00,190 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 11:50:00,190 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:50:00,190 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 11:50:00,190 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=81, Unknown=0, NotChecked=0, Total=132 [2021-05-02 11:50:00,190 INFO L87 Difference]: Start difference. First operand 43 states and 49 transitions. Second operand has 12 states, 12 states have (on average 2.9166666666666665) internal successors, (35), 11 states have internal predecessors, (35), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:50:00,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:50:00,354 INFO L93 Difference]: Finished difference Result 80 states and 94 transitions. [2021-05-02 11:50:00,355 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 11:50:00,355 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.9166666666666665) internal successors, (35), 11 states have internal predecessors, (35), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 24 [2021-05-02 11:50:00,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:50:00,357 INFO L225 Difference]: With dead ends: 80 [2021-05-02 11:50:00,357 INFO L226 Difference]: Without dead ends: 57 [2021-05-02 11:50:00,358 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 165.9ms TimeCoverageRelationStatistics Valid=68, Invalid=114, Unknown=0, NotChecked=0, Total=182 [2021-05-02 11:50:00,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-05-02 11:50:00,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 51. [2021-05-02 11:50:00,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 45 states have (on average 1.1777777777777778) internal successors, (53), 45 states have internal predecessors, (53), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 11:50:00,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 58 transitions. [2021-05-02 11:50:00,362 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 58 transitions. Word has length 24 [2021-05-02 11:50:00,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:50:00,362 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 58 transitions. [2021-05-02 11:50:00,362 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.9166666666666665) internal successors, (35), 11 states have internal predecessors, (35), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:50:00,362 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 58 transitions. [2021-05-02 11:50:00,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-02 11:50:00,362 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:50:00,363 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:50:00,569 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:50:00,569 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:50:00,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:50:00,570 INFO L82 PathProgramCache]: Analyzing trace with hash -1312024861, now seen corresponding path program 3 times [2021-05-02 11:50:00,570 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:50:00,570 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1024132722] [2021-05-02 11:50:00,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:50:00,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:50:00,659 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:50:00,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:50:00,666 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:50:00,666 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:50:00,666 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1024132722] [2021-05-02 11:50:00,666 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1024132722] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:50:00,666 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1975777941] [2021-05-02 11:50:00,667 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 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:50:00,721 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-05-02 11:50:00,721 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:50:00,722 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 11:50:00,723 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:50:00,747 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,748 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,763 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,766 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,785 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,787 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,814 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,818 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,840 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,845 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:50:00,845 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1975777941] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:50:00,845 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:50:00,845 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 14 [2021-05-02 11:50:00,845 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [862656988] [2021-05-02 11:50:00,846 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 11:50:00,846 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:50:00,846 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 11:50:00,846 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=112, Unknown=0, NotChecked=0, Total=182 [2021-05-02 11:50:00,846 INFO L87 Difference]: Start difference. First operand 51 states and 58 transitions. Second operand has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 13 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:50:00,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:50:00,971 INFO L93 Difference]: Finished difference Result 92 states and 108 transitions. [2021-05-02 11:50:00,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 11:50:00,971 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 13 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 28 [2021-05-02 11:50:00,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:50:00,972 INFO L225 Difference]: With dead ends: 92 [2021-05-02 11:50:00,972 INFO L226 Difference]: Without dead ends: 65 [2021-05-02 11:50:00,972 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 144.8ms TimeCoverageRelationStatistics Valid=89, Invalid=151, Unknown=0, NotChecked=0, Total=240 [2021-05-02 11:50:00,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-02 11:50:00,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 59. [2021-05-02 11:50:00,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 53 states have (on average 1.169811320754717) internal successors, (62), 53 states have internal predecessors, (62), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 11:50:00,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 67 transitions. [2021-05-02 11:50:00,976 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 67 transitions. Word has length 28 [2021-05-02 11:50:00,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:50:00,976 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 67 transitions. [2021-05-02 11:50:00,976 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 13 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:50:00,976 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 67 transitions. [2021-05-02 11:50:00,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 11:50:00,977 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:50:00,977 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:50:01,194 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-02 11:50:01,194 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:50:01,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:50:01,195 INFO L82 PathProgramCache]: Analyzing trace with hash 1026934172, now seen corresponding path program 4 times [2021-05-02 11:50:01,195 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:50:01,195 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1794576617] [2021-05-02 11:50:01,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:50:01,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:50:01,281 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:50:01,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:50:01,289 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:50:01,289 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:50:01,289 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1794576617] [2021-05-02 11:50:01,289 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1794576617] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:50:01,289 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [7462364] [2021-05-02 11:50:01,289 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:50:01,357 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 11:50:01,357 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:50:01,358 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-02 11:50:01,363 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:50:01,381 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,384 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,402 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,404 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,419 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,421 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,461 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,465 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,483 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,485 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,498 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:01,502 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:50:01,502 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [7462364] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:50:01,503 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:50:01,503 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 16 [2021-05-02 11:50:01,503 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1799244530] [2021-05-02 11:50:01,504 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 11:50:01,504 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:50:01,504 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 11:50:01,505 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=148, Unknown=0, NotChecked=0, Total=240 [2021-05-02 11:50:01,505 INFO L87 Difference]: Start difference. First operand 59 states and 67 transitions. Second operand has 16 states, 16 states have (on average 3.1875) internal successors, (51), 15 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:50:01,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:50:01,669 INFO L93 Difference]: Finished difference Result 104 states and 122 transitions. [2021-05-02 11:50:01,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 11:50:01,669 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.1875) internal successors, (51), 15 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2021-05-02 11:50:01,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:50:01,670 INFO L225 Difference]: With dead ends: 104 [2021-05-02 11:50:01,670 INFO L226 Difference]: Without dead ends: 73 [2021-05-02 11:50:01,670 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 166.6ms TimeCoverageRelationStatistics Valid=125, Invalid=217, Unknown=0, NotChecked=0, Total=342 [2021-05-02 11:50:01,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2021-05-02 11:50:01,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 67. [2021-05-02 11:50:01,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 61 states have (on average 1.1639344262295082) internal successors, (71), 61 states have internal predecessors, (71), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 11:50:01,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 76 transitions. [2021-05-02 11:50:01,675 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 76 transitions. Word has length 32 [2021-05-02 11:50:01,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:50:01,675 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 76 transitions. [2021-05-02 11:50:01,675 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 3.1875) internal successors, (51), 15 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:50:01,675 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 76 transitions. [2021-05-02 11:50:01,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 11:50:01,675 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:50:01,675 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:50:01,880 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:50:01,881 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:50:01,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:50:01,881 INFO L82 PathProgramCache]: Analyzing trace with hash -1975029803, now seen corresponding path program 5 times [2021-05-02 11:50:01,881 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:50:01,881 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [750073560] [2021-05-02 11:50:01,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:50:01,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-02 11:50:01,913 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-02 11:50:01,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-02 11:50:01,923 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-02 11:50:01,962 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-05-02 11:50:01,962 INFO L624 BasicCegarLoop]: Counterexample might be feasible [2021-05-02 11:50:01,962 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-05-02 11:50:02,013 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 11:50:02 BoogieIcfgContainer [2021-05-02 11:50:02,013 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-02 11:50:02,013 INFO L168 Benchmark]: Toolchain (without parser) took 5270.61 ms. Allocated memory was 213.9 MB in the beginning and 302.0 MB in the end (delta: 88.1 MB). Free memory was 177.2 MB in the beginning and 217.6 MB in the end (delta: -40.4 MB). Peak memory consumption was 48.5 MB. Max. memory is 8.0 GB. [2021-05-02 11:50:02,014 INFO L168 Benchmark]: CDTParser took 0.09 ms. Allocated memory is still 213.9 MB. Free memory is still 193.9 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 11:50:02,014 INFO L168 Benchmark]: CACSL2BoogieTranslator took 266.26 ms. Allocated memory is still 213.9 MB. Free memory was 177.0 MB in the beginning and 193.7 MB in the end (delta: -16.7 MB). Peak memory consumption was 9.6 MB. Max. memory is 8.0 GB. [2021-05-02 11:50:02,014 INFO L168 Benchmark]: Boogie Preprocessor took 46.53 ms. Allocated memory is still 213.9 MB. Free memory was 193.7 MB in the beginning and 191.1 MB in the end (delta: 2.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-05-02 11:50:02,014 INFO L168 Benchmark]: RCFGBuilder took 362.59 ms. Allocated memory is still 213.9 MB. Free memory was 191.1 MB in the beginning and 161.7 MB in the end (delta: 29.4 MB). Peak memory consumption was 29.4 MB. Max. memory is 8.0 GB. [2021-05-02 11:50:02,014 INFO L168 Benchmark]: TraceAbstraction took 4583.61 ms. Allocated memory was 213.9 MB in the beginning and 302.0 MB in the end (delta: 88.1 MB). Free memory was 161.2 MB in the beginning and 217.6 MB in the end (delta: -56.5 MB). Peak memory consumption was 32.7 MB. Max. memory is 8.0 GB. [2021-05-02 11:50:02,014 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 213.9 MB. Free memory is still 193.9 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 266.26 ms. Allocated memory is still 213.9 MB. Free memory was 177.0 MB in the beginning and 193.7 MB in the end (delta: -16.7 MB). Peak memory consumption was 9.6 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 46.53 ms. Allocated memory is still 213.9 MB. Free memory was 193.7 MB in the beginning and 191.1 MB in the end (delta: 2.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 362.59 ms. Allocated memory is still 213.9 MB. Free memory was 191.1 MB in the beginning and 161.7 MB in the end (delta: 29.4 MB). Peak memory consumption was 29.4 MB. Max. memory is 8.0 GB. * TraceAbstraction took 4583.61 ms. Allocated memory was 213.9 MB in the beginning and 302.0 MB in the end (delta: 88.1 MB). Free memory was 161.2 MB in the beginning and 217.6 MB in the end (delta: -56.5 MB). Peak memory consumption was 32.7 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 7]: Unable to prove that call to reach_error is unreachable Unable to prove that call to reach_error is unreachable Reason: overapproximation of to_real at line 98, overapproximation of someBinaryArithmeticDOUBLEoperation at line 100. Possible FailurePath: [L71] double a[50][50], b[50], x[50]; VAL [\old(a)=20026, \old(a)=20011, \old(b)=20013, \old(b)=20018, \old(x)=20003, \old(x)=20004, a={5:0}, b={6:0}, x={3:0}] [L88] int i, j, nmax = 50, n = 5, chkerr; [L89] double eps, w; [L91] eps = 1.0e-6 [L93] i = 0 VAL [a={5:0}, b={6:0}, eps=1/1000000, i=0, n=5, nmax=50, x={3:0}] [L93] COND TRUE i <= n [L95] w = 0.0 [L96] j = 0 VAL [a={5:0}, b={6:0}, eps=1/1000000, i=0, j=0, n=5, nmax=50, w=0, x={3:0}] [L96] COND TRUE j <= n [L98] a[i][j] = (i + 1) + (j + 1) VAL [a={5:0}, b={6:0}, eps=1/1000000, i=0, j=0, n=5, nmax=50, w=0, x={3:0}] [L99] COND TRUE i == j [L99] EXPR a[i][j] [L99] a[i][j] *= 10.0 [L100] EXPR a[i][j] [L100] w += a[i][j] [L96] j++ VAL [a={5:0}, b={6:0}, eps=1/1000000, i=0, j=1, n=5, nmax=50, x={3:0}] [L96] COND TRUE j <= n [L98] a[i][j] = (i + 1) + (j + 1) VAL [a={5:0}, b={6:0}, eps=1/1000000, i=0, j=1, n=5, nmax=50, x={3:0}] [L99] COND FALSE !(i == j) VAL [a={5:0}, b={6:0}, eps=1/1000000, i=0, j=1, n=5, nmax=50, x={3:0}] [L100] EXPR a[i][j] [L100] w += a[i][j] [L96] j++ VAL [a={5:0}, b={6:0}, eps=1/1000000, i=0, j=2, n=5, nmax=50, x={3:0}] [L96] COND TRUE j <= n [L98] a[i][j] = (i + 1) + (j + 1) VAL [a={5:0}, b={6:0}, eps=1/1000000, i=0, j=2, n=5, nmax=50, x={3:0}] [L99] COND FALSE !(i == j) VAL [a={5:0}, b={6:0}, eps=1/1000000, i=0, j=2, n=5, nmax=50, x={3:0}] [L100] EXPR a[i][j] [L100] w += a[i][j] [L96] j++ VAL [a={5:0}, b={6:0}, eps=1/1000000, i=0, j=3, n=5, nmax=50, x={3:0}] [L96] COND TRUE j <= n [L98] a[i][j] = (i + 1) + (j + 1) VAL [a={5:0}, b={6:0}, eps=1/1000000, i=0, j=3, n=5, nmax=50, x={3:0}] [L99] COND FALSE !(i == j) VAL [a={5:0}, b={6:0}, eps=1/1000000, i=0, j=3, n=5, nmax=50, x={3:0}] [L100] EXPR a[i][j] [L100] w += a[i][j] [L96] j++ VAL [a={5:0}, b={6:0}, eps=1/1000000, i=0, j=4, n=5, nmax=50, x={3:0}] [L96] COND TRUE j <= n [L98] a[i][j] = (i + 1) + (j + 1) VAL [a={5:0}, b={6:0}, eps=1/1000000, i=0, j=4, n=5, nmax=50, x={3:0}] [L99] COND FALSE !(i == j) VAL [a={5:0}, b={6:0}, eps=1/1000000, i=0, j=4, n=5, nmax=50, x={3:0}] [L100] EXPR a[i][j] [L100] w += a[i][j] [L96] j++ VAL [a={5:0}, b={6:0}, eps=1/1000000, i=0, j=5, n=5, nmax=50, x={3:0}] [L96] COND TRUE j <= n [L98] a[i][j] = (i + 1) + (j + 1) VAL [a={5:0}, b={6:0}, eps=1/1000000, i=0, j=5, n=5, nmax=50, x={3:0}] [L99] COND FALSE !(i == j) VAL [a={5:0}, b={6:0}, eps=1/1000000, i=0, j=5, n=5, nmax=50, x={3:0}] [L100] EXPR a[i][j] [L100] w += a[i][j] [L96] j++ VAL [a={5:0}, b={6:0}, eps=1/1000000, i=0, j=6, n=5, nmax=50, x={3:0}] [L96] COND FALSE !(j <= n) VAL [a={5:0}, b={6:0}, eps=1/1000000, i=0, j=6, n=5, nmax=50, x={3:0}] [L102] CALL __VERIFIER_assert(i==2) VAL [\old(cond)=0, a={5:0}, b={6:0}, x={3:0}] [L6] COND TRUE !(cond) VAL [\old(cond)=0, a={5:0}, b={6:0}, cond=0, x={3:0}] [L7] reach_error() VAL [\old(cond)=0, a={5:0}, b={6:0}, cond=0, x={3:0}] - StatisticsResult: Ultimate Automizer benchmark data CFG has 7 procedures, 67 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 4499.9ms, OverallIterations: 9, TraceHistogramMax: 6, EmptinessCheckTime: 9.2ms, AutomataDifference: 1138.6ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 7.8ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 182 SDtfs, 304 SDslu, 207 SDs, 0 SdLazy, 489 SolverSat, 89 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 431.7ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 210 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 187 ImplicationChecksByTransitivity, 926.4ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=67occurred in iteration=8, InterpolantAutomatonStates: 66, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 63.2ms AutomataMinimizationTime, 8 MinimizatonAttempts, 41 StatesRemovedByMinimization, 8 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 77.3ms SsaConstructionTime, 310.3ms SatisfiabilityAnalysisTime, 1263.0ms InterpolantComputationTime, 340 NumberOfCodeBlocks, 340 NumberOfCodeBlocksAsserted, 22 NumberOfCheckSat, 290 ConstructedInterpolants, 0 QuantifiedInterpolants, 1490 SizeOfPredicates, 12 NumberOfNonLiveVariables, 1022 ConjunctsInSsa, 34 ConjunctsInUnsatCore, 14 InterpolantComputations, 3 PerfectInterpolantSequences, 10/202 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: unable to determine feasibility of some traces Received shutdown request...