/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/loop-acceleration/diamond_1-2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 12:04:42,825 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 12:04:42,827 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 12:04:42,857 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 12:04:42,872 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 12:04:42,873 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 12:04:42,874 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 12:04:42,875 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 12:04:42,877 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 12:04:42,878 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 12:04:42,879 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 12:04:42,883 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 12:04:42,884 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 12:04:42,885 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 12:04:42,885 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 12:04:42,887 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 12:04:42,891 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 12:04:42,899 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 12:04:42,899 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 12:04:42,900 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 12:04:42,903 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 12:04:42,948 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 12:04:42,948 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 12:04:42,950 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 12:04:42,950 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 12:04:42,950 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 12:04:42,951 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 12:04:42,951 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 12:04:42,951 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 12:04:42,951 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 12:04:42,951 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 12:04:42,952 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 12:04:42,952 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 12:04:42,952 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 12:04:42,952 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 12:04:42,952 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 12:04:42,953 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 12:04:42,953 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 12:04:42,953 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 12:04:42,953 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 12:04:42,953 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 12:04:42,953 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 12:04:42,953 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 12:04:42,954 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 12:04:42,954 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 12:04:42,954 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 12:04:42,954 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 12:04:42,954 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 12:04:42,954 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 12:04:42,954 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 12:04:43,190 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 12:04:43,203 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 12:04:43,204 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 12:04:43,205 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 12:04:43,206 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 12:04:43,206 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/diamond_1-2.c [2021-05-02 12:04:43,253 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f4d8b0cf3/2ca2c5e441444ff9929d093d9c62c800/FLAG970d68500 [2021-05-02 12:04:43,624 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 12:04:43,624 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/diamond_1-2.c [2021-05-02 12:04:43,629 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f4d8b0cf3/2ca2c5e441444ff9929d093d9c62c800/FLAG970d68500 [2021-05-02 12:04:43,644 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f4d8b0cf3/2ca2c5e441444ff9929d093d9c62c800 [2021-05-02 12:04:43,646 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 12:04:43,648 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 12:04:43,650 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 12:04:43,651 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 12:04:43,653 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 12:04:43,654 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 12:04:43" (1/1) ... [2021-05-02 12:04:43,654 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@64f23c8e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:04:43, skipping insertion in model container [2021-05-02 12:04:43,655 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 12:04:43" (1/1) ... [2021-05-02 12:04:43,659 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 12:04:43,668 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 12:04:43,774 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/diamond_1-2.c[373,386] [2021-05-02 12:04:43,785 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 12:04:43,789 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 12:04:43,797 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/diamond_1-2.c[373,386] [2021-05-02 12:04:43,804 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 12:04:43,814 INFO L208 MainTranslator]: Completed translation [2021-05-02 12:04:43,814 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:04:43 WrapperNode [2021-05-02 12:04:43,814 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 12:04:43,815 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 12:04:43,815 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 12:04:43,816 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 12:04:43,862 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:04:43" (1/1) ... [2021-05-02 12:04:43,863 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:04:43" (1/1) ... [2021-05-02 12:04:43,869 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:04:43" (1/1) ... [2021-05-02 12:04:43,869 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:04:43" (1/1) ... [2021-05-02 12:04:43,875 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:04:43" (1/1) ... [2021-05-02 12:04:43,878 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:04:43" (1/1) ... [2021-05-02 12:04:43,882 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:04:43" (1/1) ... [2021-05-02 12:04:43,883 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 12:04:43,885 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 12:04:43,885 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 12:04:43,885 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 12:04:43,885 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:04:43" (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 12:04:44,013 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 12:04:44,013 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 12:04:44,013 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 12:04:44,014 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 12:04:44,014 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 12:04:44,014 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 12:04:44,014 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 12:04:44,014 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 12:04:44,014 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 12:04:44,014 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2021-05-02 12:04:44,015 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 12:04:44,015 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 12:04:44,015 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 12:04:44,015 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 12:04:44,016 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 12:04:44,016 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 12:04:44,016 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 12:04:44,016 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 12:04:44,173 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 12:04:44,173 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 12:04:44,174 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 12:04:44 BoogieIcfgContainer [2021-05-02 12:04:44,174 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 12:04:44,175 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 12:04:44,175 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 12:04:44,176 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 12:04:44,176 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 12:04:43" (1/3) ... [2021-05-02 12:04:44,177 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4be8b5be and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 12:04:44, skipping insertion in model container [2021-05-02 12:04:44,177 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:04:43" (2/3) ... [2021-05-02 12:04:44,177 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4be8b5be and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 12:04:44, skipping insertion in model container [2021-05-02 12:04:44,177 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 12:04:44" (3/3) ... [2021-05-02 12:04:44,178 INFO L111 eAbstractionObserver]: Analyzing ICFG diamond_1-2.c [2021-05-02 12:04:44,181 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 12:04:44,184 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 12:04:44,193 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 12:04:44,206 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 12:04:44,206 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 12:04:44,206 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 12:04:44,206 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 12:04:44,207 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 12:04:44,207 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 12:04:44,207 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 12:04:44,207 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 12:04:44,215 INFO L276 IsEmpty]: Start isEmpty. Operand has 19 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 12:04:44,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 12:04:44,218 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:44,218 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:44,218 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:44,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:44,221 INFO L82 PathProgramCache]: Analyzing trace with hash -1418018830, now seen corresponding path program 1 times [2021-05-02 12:04:44,226 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:44,226 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1159738377] [2021-05-02 12:04:44,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:44,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:44,342 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:44,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:44,356 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 12:04:44,356 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:44,356 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1159738377] [2021-05-02 12:04:44,357 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1159738377] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 12:04:44,357 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 12:04:44,357 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 12:04:44,357 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [320209653] [2021-05-02 12:04:44,360 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 12:04:44,360 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:44,367 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 12:04:44,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 12:04:44,369 INFO L87 Difference]: Start difference. First operand has 19 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 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 12:04:44,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:44,400 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2021-05-02 12:04:44,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 12:04:44,401 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 12:04:44,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:44,404 INFO L225 Difference]: With dead ends: 30 [2021-05-02 12:04:44,405 INFO L226 Difference]: Without dead ends: 13 [2021-05-02 12:04:44,406 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 26.4ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 12:04:44,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-05-02 12:04:44,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-05-02 12:04:44,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 8 states have (on average 1.25) internal successors, (10), 8 states have internal predecessors, (10), 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 12:04:44,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2021-05-02 12:04:44,427 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 11 [2021-05-02 12:04:44,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:44,427 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2021-05-02 12:04:44,427 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 12:04:44,427 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2021-05-02 12:04:44,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 12:04:44,428 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:44,428 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:44,428 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 12:04:44,428 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:44,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:44,429 INFO L82 PathProgramCache]: Analyzing trace with hash -1427254040, now seen corresponding path program 1 times [2021-05-02 12:04:44,429 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:44,429 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [628778982] [2021-05-02 12:04:44,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:44,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:44,512 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:44,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:44,520 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 12:04:44,520 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:44,520 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [628778982] [2021-05-02 12:04:44,521 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [628778982] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 12:04:44,521 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 12:04:44,521 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 12:04:44,521 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2092787143] [2021-05-02 12:04:44,522 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 12:04:44,522 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:44,523 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 12:04:44,523 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 12:04:44,523 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 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 12:04:44,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:44,566 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2021-05-02 12:04:44,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 12:04:44,566 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 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 12:04:44,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:44,568 INFO L225 Difference]: With dead ends: 20 [2021-05-02 12:04:44,568 INFO L226 Difference]: Without dead ends: 15 [2021-05-02 12:04:44,568 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 56.7ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 12:04:44,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-05-02 12:04:44,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 14. [2021-05-02 12:04:44,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:04:44,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2021-05-02 12:04:44,572 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 11 [2021-05-02 12:04:44,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:44,572 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2021-05-02 12:04:44,573 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 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 12:04:44,573 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2021-05-02 12:04:44,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-05-02 12:04:44,573 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:44,573 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:44,573 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 12:04:44,573 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:44,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:44,574 INFO L82 PathProgramCache]: Analyzing trace with hash -397340509, now seen corresponding path program 1 times [2021-05-02 12:04:44,574 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:44,574 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1665407730] [2021-05-02 12:04:44,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:44,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:44,644 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:44,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:44,652 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 12:04:44,652 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:44,652 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1665407730] [2021-05-02 12:04:44,652 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1665407730] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:44,652 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [883510282] [2021-05-02 12:04:44,653 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 12:04:44,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:44,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 12:04:44,711 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:04:44,783 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 12:04:44,783 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [883510282] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:44,783 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:04:44,783 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-02 12:04:44,783 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [412717947] [2021-05-02 12:04:44,784 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 12:04:44,784 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:44,784 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 12:04:44,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 12:04:44,785 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 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 12:04:44,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:44,932 INFO L93 Difference]: Finished difference Result 24 states and 29 transitions. [2021-05-02 12:04:44,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 12:04:44,933 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 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 13 [2021-05-02 12:04:44,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:44,934 INFO L225 Difference]: With dead ends: 24 [2021-05-02 12:04:44,934 INFO L226 Difference]: Without dead ends: 19 [2021-05-02 12:04:44,934 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 114.6ms TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-05-02 12:04:44,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-05-02 12:04:44,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 16. [2021-05-02 12:04:44,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 11 states have internal predecessors, (14), 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 12:04:44,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2021-05-02 12:04:44,938 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 13 [2021-05-02 12:04:44,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:44,938 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2021-05-02 12:04:44,938 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 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 12:04:44,938 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2021-05-02 12:04:44,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 12:04:44,938 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:44,939 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:45,159 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 12:04:45,159 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:45,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:45,160 INFO L82 PathProgramCache]: Analyzing trace with hash 1507084702, now seen corresponding path program 2 times [2021-05-02 12:04:45,160 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:45,160 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [267596978] [2021-05-02 12:04:45,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:45,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:45,237 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:45,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:45,244 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:04:45,244 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:45,244 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [267596978] [2021-05-02 12:04:45,244 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [267596978] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:45,245 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [56143339] [2021-05-02 12:04:45,245 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 12:04:45,297 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:04:45,297 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:04:45,298 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 12:04:45,299 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:04:45,337 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:45,349 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:04:45,349 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [56143339] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:45,349 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:04:45,349 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 12:04:45,349 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [793750169] [2021-05-02 12:04:45,349 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 12:04:45,350 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:45,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 12:04:45,350 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-02 12:04:45,350 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 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 12:04:45,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:45,473 INFO L93 Difference]: Finished difference Result 27 states and 33 transitions. [2021-05-02 12:04:45,473 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 12:04:45,473 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 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 15 [2021-05-02 12:04:45,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:45,473 INFO L225 Difference]: With dead ends: 27 [2021-05-02 12:04:45,474 INFO L226 Difference]: Without dead ends: 22 [2021-05-02 12:04:45,474 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 129.1ms TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2021-05-02 12:04:45,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-05-02 12:04:45,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 18. [2021-05-02 12:04:45,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:04:45,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 21 transitions. [2021-05-02 12:04:45,477 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 21 transitions. Word has length 15 [2021-05-02 12:04:45,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:45,478 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 21 transitions. [2021-05-02 12:04:45,478 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 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 12:04:45,478 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 21 transitions. [2021-05-02 12:04:45,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 12:04:45,478 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:45,478 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:45,693 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:04:45,694 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:45,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:45,694 INFO L82 PathProgramCache]: Analyzing trace with hash -1978535968, now seen corresponding path program 1 times [2021-05-02 12:04:45,694 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:45,694 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [390874336] [2021-05-02 12:04:45,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:45,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:45,736 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:45,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:45,741 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:04:45,742 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:45,742 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [390874336] [2021-05-02 12:04:45,742 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [390874336] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 12:04:45,742 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 12:04:45,742 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 12:04:45,742 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [211153983] [2021-05-02 12:04:45,742 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 12:04:45,742 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:45,743 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 12:04:45,743 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 12:04:45,743 INFO L87 Difference]: Start difference. First operand 18 states and 21 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 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 12:04:45,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:45,779 INFO L93 Difference]: Finished difference Result 29 states and 35 transitions. [2021-05-02 12:04:45,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 12:04:45,779 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 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 15 [2021-05-02 12:04:45,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:45,780 INFO L225 Difference]: With dead ends: 29 [2021-05-02 12:04:45,780 INFO L226 Difference]: Without dead ends: 22 [2021-05-02 12:04:45,780 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 34.2ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 12:04:45,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-05-02 12:04:45,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2021-05-02 12:04:45,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.3125) internal successors, (21), 16 states have internal predecessors, (21), 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 12:04:45,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2021-05-02 12:04:45,784 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 15 [2021-05-02 12:04:45,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:45,784 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2021-05-02 12:04:45,784 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 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 12:04:45,784 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2021-05-02 12:04:45,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 12:04:45,785 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:45,785 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:45,785 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-05-02 12:04:45,785 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:45,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:45,785 INFO L82 PathProgramCache]: Analyzing trace with hash -2035794270, now seen corresponding path program 1 times [2021-05-02 12:04:45,785 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:45,785 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1535293699] [2021-05-02 12:04:45,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:45,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:45,841 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:45,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:45,846 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:04:45,846 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:45,846 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1535293699] [2021-05-02 12:04:45,846 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1535293699] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:45,846 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [973967226] [2021-05-02 12:04:45,846 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 12:04:45,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:45,877 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 12:04:45,877 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:04:45,906 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:45,913 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:04:45,913 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [973967226] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:45,913 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:04:45,914 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 12:04:45,914 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [130791666] [2021-05-02 12:04:45,914 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 12:04:45,914 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:45,914 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 12:04:45,914 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-02 12:04:45,915 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 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 12:04:46,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:46,007 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2021-05-02 12:04:46,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 12:04:46,008 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 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 15 [2021-05-02 12:04:46,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:46,008 INFO L225 Difference]: With dead ends: 30 [2021-05-02 12:04:46,008 INFO L226 Difference]: Without dead ends: 25 [2021-05-02 12:04:46,008 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 99.1ms TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-05-02 12:04:46,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-05-02 12:04:46,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 23. [2021-05-02 12:04:46,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 18 states have internal predecessors, (23), 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 12:04:46,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2021-05-02 12:04:46,012 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 15 [2021-05-02 12:04:46,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:46,012 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2021-05-02 12:04:46,012 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 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 12:04:46,012 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2021-05-02 12:04:46,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 12:04:46,013 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:46,013 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:46,230 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:04:46,230 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:46,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:46,231 INFO L82 PathProgramCache]: Analyzing trace with hash 2003644377, now seen corresponding path program 3 times [2021-05-02 12:04:46,231 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:46,231 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2105293201] [2021-05-02 12:04:46,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:46,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:46,319 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:46,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:46,323 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:04:46,323 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:46,324 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2105293201] [2021-05-02 12:04:46,324 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2105293201] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:46,324 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1059302978] [2021-05-02 12:04:46,324 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 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 12:04:46,373 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 12:04:46,373 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:04:46,374 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 12:04:46,374 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:04:46,410 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:46,416 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:04:46,417 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1059302978] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:46,417 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:04:46,417 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 12:04:46,417 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [602360735] [2021-05-02 12:04:46,417 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 12:04:46,417 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:46,418 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 12:04:46,418 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-02 12:04:46,418 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 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 12:04:46,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:46,573 INFO L93 Difference]: Finished difference Result 34 states and 41 transitions. [2021-05-02 12:04:46,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 12:04:46,573 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 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 17 [2021-05-02 12:04:46,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:46,574 INFO L225 Difference]: With dead ends: 34 [2021-05-02 12:04:46,574 INFO L226 Difference]: Without dead ends: 29 [2021-05-02 12:04:46,574 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 151.3ms TimeCoverageRelationStatistics Valid=45, Invalid=111, Unknown=0, NotChecked=0, Total=156 [2021-05-02 12:04:46,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-02 12:04:46,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 25. [2021-05-02 12:04:46,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.3) internal successors, (26), 20 states have internal predecessors, (26), 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 12:04:46,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 30 transitions. [2021-05-02 12:04:46,579 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 30 transitions. Word has length 17 [2021-05-02 12:04:46,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:46,579 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 30 transitions. [2021-05-02 12:04:46,579 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 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 12:04:46,579 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 30 transitions. [2021-05-02 12:04:46,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 12:04:46,579 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:46,579 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:46,795 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:04:46,795 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:46,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:46,796 INFO L82 PathProgramCache]: Analyzing trace with hash -1539234595, now seen corresponding path program 2 times [2021-05-02 12:04:46,796 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:46,796 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [861952902] [2021-05-02 12:04:46,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:46,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:46,824 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:46,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:46,828 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 12:04:46,828 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:46,828 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [861952902] [2021-05-02 12:04:46,828 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [861952902] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 12:04:46,828 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 12:04:46,828 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 12:04:46,828 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [520187250] [2021-05-02 12:04:46,828 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 12:04:46,828 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:46,829 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 12:04:46,829 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 12:04:46,829 INFO L87 Difference]: Start difference. First operand 25 states and 30 transitions. Second operand has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 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 12:04:46,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:46,860 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2021-05-02 12:04:46,860 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 12:04:46,861 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 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 17 [2021-05-02 12:04:46,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:46,861 INFO L225 Difference]: With dead ends: 34 [2021-05-02 12:04:46,861 INFO L226 Difference]: Without dead ends: 26 [2021-05-02 12:04:46,861 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 31.1ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 12:04:46,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-05-02 12:04:46,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2021-05-02 12:04:46,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.15) internal successors, (23), 20 states have internal predecessors, (23), 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 12:04:46,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2021-05-02 12:04:46,865 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 17 [2021-05-02 12:04:46,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:46,865 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2021-05-02 12:04:46,865 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 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 12:04:46,865 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2021-05-02 12:04:46,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 12:04:46,865 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:46,865 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:46,865 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-05-02 12:04:46,865 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:46,866 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:46,866 INFO L82 PathProgramCache]: Analyzing trace with hash -1146207585, now seen corresponding path program 2 times [2021-05-02 12:04:46,866 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:46,866 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1222084856] [2021-05-02 12:04:46,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:46,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:46,923 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:46,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:46,926 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:04:46,926 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:46,926 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1222084856] [2021-05-02 12:04:46,927 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1222084856] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:46,927 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1357161007] [2021-05-02 12:04:46,927 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 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 12:04:46,963 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:04:46,963 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:04:46,964 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 12:04:46,964 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:04:46,993 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:46,999 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:04:46,999 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1357161007] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:46,999 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:04:46,999 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 12:04:47,000 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1108459034] [2021-05-02 12:04:47,000 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 12:04:47,000 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:47,000 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 12:04:47,000 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-02 12:04:47,000 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 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 12:04:47,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:47,132 INFO L93 Difference]: Finished difference Result 33 states and 35 transitions. [2021-05-02 12:04:47,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 12:04:47,133 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 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 17 [2021-05-02 12:04:47,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:47,133 INFO L225 Difference]: With dead ends: 33 [2021-05-02 12:04:47,133 INFO L226 Difference]: Without dead ends: 28 [2021-05-02 12:04:47,134 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 113.1ms TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2021-05-02 12:04:47,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-05-02 12:04:47,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2021-05-02 12:04:47,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 22 states have internal predecessors, (25), 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 12:04:47,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2021-05-02 12:04:47,137 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 17 [2021-05-02 12:04:47,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:47,137 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2021-05-02 12:04:47,137 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 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 12:04:47,137 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2021-05-02 12:04:47,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-02 12:04:47,138 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:47,138 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:47,352 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:04:47,353 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:47,353 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:47,353 INFO L82 PathProgramCache]: Analyzing trace with hash -1838845100, now seen corresponding path program 4 times [2021-05-02 12:04:47,353 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:47,353 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [194444969] [2021-05-02 12:04:47,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:47,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:47,418 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:47,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:47,422 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:04:47,422 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:47,422 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [194444969] [2021-05-02 12:04:47,422 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [194444969] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:47,422 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [690970191] [2021-05-02 12:04:47,422 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 12:04:47,451 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:04:47,452 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:04:47,452 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 12:04:47,453 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:04:47,487 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:47,493 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:04:47,493 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [690970191] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:47,493 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:04:47,493 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-02 12:04:47,493 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [256726352] [2021-05-02 12:04:47,494 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 12:04:47,494 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:47,494 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 12:04:47,494 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-05-02 12:04:47,494 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 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 12:04:47,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:47,663 INFO L93 Difference]: Finished difference Result 35 states and 37 transitions. [2021-05-02 12:04:47,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 12:04:47,663 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 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 19 [2021-05-02 12:04:47,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:47,664 INFO L225 Difference]: With dead ends: 35 [2021-05-02 12:04:47,664 INFO L226 Difference]: Without dead ends: 30 [2021-05-02 12:04:47,664 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 166.2ms TimeCoverageRelationStatistics Valid=54, Invalid=156, Unknown=0, NotChecked=0, Total=210 [2021-05-02 12:04:47,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-02 12:04:47,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2021-05-02 12:04:47,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 24 states have (on average 1.125) internal successors, (27), 24 states have internal predecessors, (27), 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 12:04:47,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2021-05-02 12:04:47,667 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 19 [2021-05-02 12:04:47,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:47,667 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2021-05-02 12:04:47,668 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 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 12:04:47,668 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2021-05-02 12:04:47,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-02 12:04:47,668 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:47,668 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:47,883 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:04:47,883 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:47,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:47,883 INFO L82 PathProgramCache]: Analyzing trace with hash -951895204, now seen corresponding path program 3 times [2021-05-02 12:04:47,883 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:47,883 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1896776858] [2021-05-02 12:04:47,883 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:47,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:47,948 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:47,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:47,952 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:04:47,952 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:47,952 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1896776858] [2021-05-02 12:04:47,952 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1896776858] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:47,952 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1619582139] [2021-05-02 12:04:47,952 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 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:04:48,018 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-05-02 12:04:48,018 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:04:48,019 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 12:04:48,019 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:04:48,052 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:48,057 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:04:48,058 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1619582139] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:48,058 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:04:48,058 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-02 12:04:48,058 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [735260712] [2021-05-02 12:04:48,058 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 12:04:48,058 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:48,058 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 12:04:48,058 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-05-02 12:04:48,059 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 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 12:04:48,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:48,205 INFO L93 Difference]: Finished difference Result 37 states and 39 transitions. [2021-05-02 12:04:48,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 12:04:48,206 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 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 19 [2021-05-02 12:04:48,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:48,206 INFO L225 Difference]: With dead ends: 37 [2021-05-02 12:04:48,206 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 12:04:48,206 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 142.0ms TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2021-05-02 12:04:48,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 12:04:48,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2021-05-02 12:04:48,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.1153846153846154) internal successors, (29), 26 states have internal predecessors, (29), 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 12:04:48,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2021-05-02 12:04:48,229 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 19 [2021-05-02 12:04:48,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:48,229 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2021-05-02 12:04:48,229 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 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 12:04:48,230 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2021-05-02 12:04:48,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 12:04:48,230 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:48,230 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:48,437 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:04:48,437 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:48,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:48,437 INFO L82 PathProgramCache]: Analyzing trace with hash -799357937, now seen corresponding path program 5 times [2021-05-02 12:04:48,437 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:48,437 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1112112593] [2021-05-02 12:04:48,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:48,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:48,536 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:48,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:48,540 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:04:48,540 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:48,540 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1112112593] [2021-05-02 12:04:48,540 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1112112593] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:48,540 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [784773220] [2021-05-02 12:04:48,540 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:04:48,573 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-05-02 12:04:48,573 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:04:48,574 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 12:04:48,574 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:04:48,617 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:48,623 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:04:48,623 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [784773220] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:48,623 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:04:48,624 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-02 12:04:48,624 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [422437539] [2021-05-02 12:04:48,624 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 12:04:48,624 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:48,624 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 12:04:48,624 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-05-02 12:04:48,625 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand has 10 states, 10 states have (on average 2.0) internal successors, (20), 9 states have internal predecessors, (20), 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 12:04:48,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:48,831 INFO L93 Difference]: Finished difference Result 39 states and 41 transitions. [2021-05-02 12:04:48,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 12:04:48,832 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.0) internal successors, (20), 9 states have internal predecessors, (20), 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 21 [2021-05-02 12:04:48,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:48,832 INFO L225 Difference]: With dead ends: 39 [2021-05-02 12:04:48,832 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 12:04:48,832 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 228.0ms TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2021-05-02 12:04:48,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 12:04:48,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2021-05-02 12:04:48,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 28 states have internal predecessors, (31), 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 12:04:48,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2021-05-02 12:04:48,836 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 21 [2021-05-02 12:04:48,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:48,836 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2021-05-02 12:04:48,836 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.0) internal successors, (20), 9 states have internal predecessors, (20), 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 12:04:48,836 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2021-05-02 12:04:48,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 12:04:48,837 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:48,837 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:49,051 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-05-02 12:04:49,052 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:49,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:49,052 INFO L82 PathProgramCache]: Analyzing trace with hash 1098709209, now seen corresponding path program 4 times [2021-05-02 12:04:49,053 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:49,053 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [411753069] [2021-05-02 12:04:49,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:49,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:49,130 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:49,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:49,134 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:04:49,134 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:49,134 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [411753069] [2021-05-02 12:04:49,134 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [411753069] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:49,134 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1321705103] [2021-05-02 12:04:49,134 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 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:04:49,164 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:04:49,164 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:04:49,164 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 12:04:49,165 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:04:49,203 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:49,213 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:04:49,213 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1321705103] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:49,213 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:04:49,213 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-02 12:04:49,213 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [26423577] [2021-05-02 12:04:49,213 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 12:04:49,213 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:49,213 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 12:04:49,214 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-05-02 12:04:49,214 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand has 10 states, 10 states have (on average 2.0) internal successors, (20), 9 states have internal predecessors, (20), 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 12:04:49,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:49,406 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2021-05-02 12:04:49,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 12:04:49,406 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.0) internal successors, (20), 9 states have internal predecessors, (20), 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 21 [2021-05-02 12:04:49,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:49,406 INFO L225 Difference]: With dead ends: 41 [2021-05-02 12:04:49,406 INFO L226 Difference]: Without dead ends: 36 [2021-05-02 12:04:49,407 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 194.9ms TimeCoverageRelationStatistics Valid=53, Invalid=187, Unknown=0, NotChecked=0, Total=240 [2021-05-02 12:04:49,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-05-02 12:04:49,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2021-05-02 12:04:49,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 30 states have (on average 1.1) internal successors, (33), 30 states have internal predecessors, (33), 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 12:04:49,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2021-05-02 12:04:49,410 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 21 [2021-05-02 12:04:49,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:49,410 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2021-05-02 12:04:49,410 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.0) internal successors, (20), 9 states have internal predecessors, (20), 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 12:04:49,410 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2021-05-02 12:04:49,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 12:04:49,411 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:49,411 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:49,626 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:04:49,627 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:49,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:49,627 INFO L82 PathProgramCache]: Analyzing trace with hash 1715393034, now seen corresponding path program 6 times [2021-05-02 12:04:49,627 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:49,627 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1218464528] [2021-05-02 12:04:49,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:49,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:49,722 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:49,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:49,729 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:04:49,729 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:49,729 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1218464528] [2021-05-02 12:04:49,729 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1218464528] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:49,729 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [628244543] [2021-05-02 12:04:49,729 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:04:49,845 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-05-02 12:04:49,845 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:04:49,845 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 12:04:49,846 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:04:49,893 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:49,899 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:04:49,899 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [628244543] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:49,899 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:04:49,899 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2021-05-02 12:04:49,899 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [660204319] [2021-05-02 12:04:49,899 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 12:04:49,899 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:49,901 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 12:04:49,901 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-02 12:04:49,902 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand has 11 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 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 12:04:50,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:50,158 INFO L93 Difference]: Finished difference Result 43 states and 45 transitions. [2021-05-02 12:04:50,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 12:04:50,158 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 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 23 [2021-05-02 12:04:50,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:50,159 INFO L225 Difference]: With dead ends: 43 [2021-05-02 12:04:50,159 INFO L226 Difference]: Without dead ends: 38 [2021-05-02 12:04:50,160 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 248.6ms TimeCoverageRelationStatistics Valid=72, Invalid=270, Unknown=0, NotChecked=0, Total=342 [2021-05-02 12:04:50,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-02 12:04:50,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2021-05-02 12:04:50,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 32 states have (on average 1.09375) internal successors, (35), 32 states have internal predecessors, (35), 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 12:04:50,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2021-05-02 12:04:50,169 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 23 [2021-05-02 12:04:50,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:50,169 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2021-05-02 12:04:50,169 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 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 12:04:50,169 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2021-05-02 12:04:50,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 12:04:50,171 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:50,171 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:50,387 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:04:50,387 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:50,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:50,387 INFO L82 PathProgramCache]: Analyzing trace with hash 339561238, now seen corresponding path program 5 times [2021-05-02 12:04:50,387 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:50,387 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [297168286] [2021-05-02 12:04:50,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:50,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:50,468 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:50,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:50,471 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:04:50,472 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:50,472 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [297168286] [2021-05-02 12:04:50,472 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [297168286] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:50,472 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [889251128] [2021-05-02 12:04:50,472 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:04:50,570 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2021-05-02 12:04:50,570 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:04:50,570 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 12:04:50,571 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:04:50,648 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:50,654 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:04:50,654 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [889251128] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:50,654 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:04:50,654 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2021-05-02 12:04:50,654 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1073202979] [2021-05-02 12:04:50,654 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 12:04:50,655 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:50,655 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 12:04:50,655 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-02 12:04:50,655 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand has 11 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 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 12:04:50,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:50,880 INFO L93 Difference]: Finished difference Result 45 states and 47 transitions. [2021-05-02 12:04:50,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 12:04:50,880 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 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 23 [2021-05-02 12:04:50,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:50,880 INFO L225 Difference]: With dead ends: 45 [2021-05-02 12:04:50,880 INFO L226 Difference]: Without dead ends: 40 [2021-05-02 12:04:50,881 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 22 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 216.7ms TimeCoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2021-05-02 12:04:50,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-05-02 12:04:50,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2021-05-02 12:04:50,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 34 states have (on average 1.088235294117647) internal successors, (37), 34 states have internal predecessors, (37), 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 12:04:50,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 41 transitions. [2021-05-02 12:04:50,884 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 41 transitions. Word has length 23 [2021-05-02 12:04:50,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:50,885 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 41 transitions. [2021-05-02 12:04:50,885 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 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 12:04:50,885 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 41 transitions. [2021-05-02 12:04:50,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-02 12:04:50,885 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:50,885 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:51,088 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 12:04:51,088 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:51,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:51,089 INFO L82 PathProgramCache]: Analyzing trace with hash 324488517, now seen corresponding path program 7 times [2021-05-02 12:04:51,089 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:51,089 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1682973445] [2021-05-02 12:04:51,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:51,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:51,178 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:51,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:51,182 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:04:51,182 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:51,182 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1682973445] [2021-05-02 12:04:51,182 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1682973445] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:51,182 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [80306791] [2021-05-02 12:04:51,182 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:04:51,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:51,215 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 12:04:51,215 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:04:51,267 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:51,273 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:04:51,273 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [80306791] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:51,273 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:04:51,273 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2021-05-02 12:04:51,274 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1689163313] [2021-05-02 12:04:51,274 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 12:04:51,274 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:51,274 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 12:04:51,274 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-02 12:04:51,274 INFO L87 Difference]: Start difference. First operand 39 states and 41 transitions. Second operand has 12 states, 12 states have (on average 2.0) internal successors, (24), 11 states have internal predecessors, (24), 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 12:04:51,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:51,550 INFO L93 Difference]: Finished difference Result 47 states and 49 transitions. [2021-05-02 12:04:51,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 12:04:51,551 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.0) internal successors, (24), 11 states have internal predecessors, (24), 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 25 [2021-05-02 12:04:51,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:51,551 INFO L225 Difference]: With dead ends: 47 [2021-05-02 12:04:51,551 INFO L226 Difference]: Without dead ends: 42 [2021-05-02 12:04:51,552 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 264.6ms TimeCoverageRelationStatistics Valid=81, Invalid=339, Unknown=0, NotChecked=0, Total=420 [2021-05-02 12:04:51,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-02 12:04:51,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2021-05-02 12:04:51,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 36 states have (on average 1.0833333333333333) internal successors, (39), 36 states have internal predecessors, (39), 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 12:04:51,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2021-05-02 12:04:51,555 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 25 [2021-05-02 12:04:51,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:51,555 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2021-05-02 12:04:51,555 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.0) internal successors, (24), 11 states have internal predecessors, (24), 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 12:04:51,555 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2021-05-02 12:04:51,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-02 12:04:51,555 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:51,555 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:51,769 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-02 12:04:51,769 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:51,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:51,769 INFO L82 PathProgramCache]: Analyzing trace with hash 942801427, now seen corresponding path program 6 times [2021-05-02 12:04:51,769 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:51,769 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1390584704] [2021-05-02 12:04:51,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:51,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:51,877 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:51,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:51,880 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:04:51,880 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:51,880 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1390584704] [2021-05-02 12:04:51,881 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1390584704] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:51,881 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1704413180] [2021-05-02 12:04:51,881 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:04:51,957 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2021-05-02 12:04:51,958 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:04:51,958 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 12:04:51,959 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:04:52,027 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:52,033 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:04:52,033 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1704413180] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:52,033 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:04:52,033 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2021-05-02 12:04:52,033 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1643164731] [2021-05-02 12:04:52,034 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 12:04:52,034 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:52,034 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 12:04:52,034 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-02 12:04:52,034 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand has 12 states, 12 states have (on average 2.0) internal successors, (24), 11 states have internal predecessors, (24), 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 12:04:52,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:52,305 INFO L93 Difference]: Finished difference Result 49 states and 51 transitions. [2021-05-02 12:04:52,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 12:04:52,305 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.0) internal successors, (24), 11 states have internal predecessors, (24), 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 25 [2021-05-02 12:04:52,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:52,305 INFO L225 Difference]: With dead ends: 49 [2021-05-02 12:04:52,305 INFO L226 Difference]: Without dead ends: 44 [2021-05-02 12:04:52,306 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 24 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 277.6ms TimeCoverageRelationStatistics Valid=69, Invalid=311, Unknown=0, NotChecked=0, Total=380 [2021-05-02 12:04:52,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-05-02 12:04:52,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2021-05-02 12:04:52,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 38 states have (on average 1.0789473684210527) internal successors, (41), 38 states have internal predecessors, (41), 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 12:04:52,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2021-05-02 12:04:52,309 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 25 [2021-05-02 12:04:52,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:52,309 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2021-05-02 12:04:52,309 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.0) internal successors, (24), 11 states have internal predecessors, (24), 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 12:04:52,309 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2021-05-02 12:04:52,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 12:04:52,309 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:52,310 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:52,525 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 12:04:52,525 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:52,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:52,525 INFO L82 PathProgramCache]: Analyzing trace with hash -599923264, now seen corresponding path program 8 times [2021-05-02 12:04:52,525 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:52,526 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [551144433] [2021-05-02 12:04:52,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:52,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:52,630 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:52,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:52,633 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:04:52,634 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:52,634 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [551144433] [2021-05-02 12:04:52,634 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [551144433] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:52,634 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1709302836] [2021-05-02 12:04:52,634 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 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:04:52,671 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:04:52,671 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:04:52,671 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 12:04:52,672 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:04:52,719 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:52,725 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:04:52,726 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1709302836] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:52,726 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:04:52,726 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2021-05-02 12:04:52,726 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [77581925] [2021-05-02 12:04:52,726 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 12:04:52,726 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:52,726 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 12:04:52,726 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-02 12:04:52,726 INFO L87 Difference]: Start difference. First operand 43 states and 45 transitions. Second operand has 13 states, 13 states have (on average 2.0) internal successors, (26), 12 states have internal predecessors, (26), 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 12:04:53,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:53,067 INFO L93 Difference]: Finished difference Result 51 states and 53 transitions. [2021-05-02 12:04:53,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 12:04:53,067 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.0) internal successors, (26), 12 states have internal predecessors, (26), 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 27 [2021-05-02 12:04:53,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:53,068 INFO L225 Difference]: With dead ends: 51 [2021-05-02 12:04:53,068 INFO L226 Difference]: Without dead ends: 46 [2021-05-02 12:04:53,068 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 322.7ms TimeCoverageRelationStatistics Valid=90, Invalid=416, Unknown=0, NotChecked=0, Total=506 [2021-05-02 12:04:53,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-05-02 12:04:53,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2021-05-02 12:04:53,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 40 states have (on average 1.075) internal successors, (43), 40 states have internal predecessors, (43), 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 12:04:53,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2021-05-02 12:04:53,071 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 27 [2021-05-02 12:04:53,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:53,071 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2021-05-02 12:04:53,071 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.0) internal successors, (26), 12 states have internal predecessors, (26), 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 12:04:53,072 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2021-05-02 12:04:53,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 12:04:53,072 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:53,072 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:53,287 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:04:53,287 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:53,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:53,287 INFO L82 PathProgramCache]: Analyzing trace with hash 836038096, now seen corresponding path program 7 times [2021-05-02 12:04:53,288 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:53,288 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2005080817] [2021-05-02 12:04:53,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:53,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:53,389 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:53,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:53,393 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:04:53,393 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:53,393 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2005080817] [2021-05-02 12:04:53,393 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2005080817] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:53,393 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [461404359] [2021-05-02 12:04:53,393 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:04:53,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:53,484 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 12:04:53,488 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:04:53,534 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:53,539 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:04:53,539 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [461404359] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:53,539 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:04:53,539 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2021-05-02 12:04:53,539 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2092454341] [2021-05-02 12:04:53,540 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 12:04:53,540 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:53,541 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 12:04:53,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-02 12:04:53,542 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand has 13 states, 13 states have (on average 2.0) internal successors, (26), 12 states have internal predecessors, (26), 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 12:04:53,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:53,857 INFO L93 Difference]: Finished difference Result 53 states and 55 transitions. [2021-05-02 12:04:53,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 12:04:53,858 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.0) internal successors, (26), 12 states have internal predecessors, (26), 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 27 [2021-05-02 12:04:53,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:53,858 INFO L225 Difference]: With dead ends: 53 [2021-05-02 12:04:53,858 INFO L226 Difference]: Without dead ends: 48 [2021-05-02 12:04:53,859 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 274.7ms TimeCoverageRelationStatistics Valid=77, Invalid=385, Unknown=0, NotChecked=0, Total=462 [2021-05-02 12:04:53,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-02 12:04:53,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2021-05-02 12:04:53,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 42 states have (on average 1.0714285714285714) internal successors, (45), 42 states have internal predecessors, (45), 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 12:04:53,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2021-05-02 12:04:53,862 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 27 [2021-05-02 12:04:53,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:53,862 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2021-05-02 12:04:53,862 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.0) internal successors, (26), 12 states have internal predecessors, (26), 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 12:04:53,862 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2021-05-02 12:04:53,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 12:04:53,863 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:53,863 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:54,077 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:04:54,077 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:54,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:54,077 INFO L82 PathProgramCache]: Analyzing trace with hash 98585467, now seen corresponding path program 9 times [2021-05-02 12:04:54,077 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:54,078 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1888822654] [2021-05-02 12:04:54,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:54,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:54,187 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:54,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:54,190 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:04:54,190 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:54,190 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1888822654] [2021-05-02 12:04:54,190 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1888822654] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:54,190 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1699236579] [2021-05-02 12:04:54,190 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 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:04:54,255 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-05-02 12:04:54,255 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:04:54,256 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 12:04:54,257 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:04:54,326 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:54,335 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:04:54,336 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1699236579] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:54,336 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:04:54,336 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2021-05-02 12:04:54,336 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [449798548] [2021-05-02 12:04:54,336 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 12:04:54,336 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:54,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 12:04:54,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-02 12:04:54,336 INFO L87 Difference]: Start difference. First operand 47 states and 49 transitions. Second operand has 14 states, 14 states have (on average 2.0) internal successors, (28), 13 states have internal predecessors, (28), 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 12:04:54,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:54,710 INFO L93 Difference]: Finished difference Result 55 states and 57 transitions. [2021-05-02 12:04:54,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 12:04:54,710 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 13 states have internal predecessors, (28), 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 29 [2021-05-02 12:04:54,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:54,710 INFO L225 Difference]: With dead ends: 55 [2021-05-02 12:04:54,711 INFO L226 Difference]: Without dead ends: 50 [2021-05-02 12:04:54,711 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 354.6ms TimeCoverageRelationStatistics Valid=99, Invalid=501, Unknown=0, NotChecked=0, Total=600 [2021-05-02 12:04:54,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-05-02 12:04:54,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2021-05-02 12:04:54,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 44 states have (on average 1.0681818181818181) internal successors, (47), 44 states have internal predecessors, (47), 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 12:04:54,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 51 transitions. [2021-05-02 12:04:54,714 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 51 transitions. Word has length 29 [2021-05-02 12:04:54,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:54,714 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 51 transitions. [2021-05-02 12:04:54,714 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 13 states have internal predecessors, (28), 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 12:04:54,714 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 51 transitions. [2021-05-02 12:04:54,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 12:04:54,714 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:54,715 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:54,929 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:04:54,929 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:54,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:54,929 INFO L82 PathProgramCache]: Analyzing trace with hash 1315692109, now seen corresponding path program 8 times [2021-05-02 12:04:54,929 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:54,929 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1287281291] [2021-05-02 12:04:54,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:54,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:55,058 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:55,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:55,063 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:04:55,063 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:55,063 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1287281291] [2021-05-02 12:04:55,063 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1287281291] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:55,063 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [881183834] [2021-05-02 12:04:55,063 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 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:04:55,101 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:04:55,101 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:04:55,102 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 12:04:55,102 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:04:55,158 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:55,167 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:04:55,167 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [881183834] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:55,167 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:04:55,168 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2021-05-02 12:04:55,168 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1306949346] [2021-05-02 12:04:55,169 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 12:04:55,169 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:55,169 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 12:04:55,169 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-02 12:04:55,170 INFO L87 Difference]: Start difference. First operand 49 states and 51 transitions. Second operand has 14 states, 14 states have (on average 2.0) internal successors, (28), 13 states have internal predecessors, (28), 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 12:04:55,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:55,536 INFO L93 Difference]: Finished difference Result 57 states and 59 transitions. [2021-05-02 12:04:55,536 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 12:04:55,536 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 13 states have internal predecessors, (28), 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 29 [2021-05-02 12:04:55,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:55,537 INFO L225 Difference]: With dead ends: 57 [2021-05-02 12:04:55,537 INFO L226 Difference]: Without dead ends: 52 [2021-05-02 12:04:55,537 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 324.9ms TimeCoverageRelationStatistics Valid=85, Invalid=467, Unknown=0, NotChecked=0, Total=552 [2021-05-02 12:04:55,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-05-02 12:04:55,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2021-05-02 12:04:55,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 46 states have (on average 1.065217391304348) internal successors, (49), 46 states have internal predecessors, (49), 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 12:04:55,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 53 transitions. [2021-05-02 12:04:55,541 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 53 transitions. Word has length 29 [2021-05-02 12:04:55,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:55,541 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 53 transitions. [2021-05-02 12:04:55,542 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 13 states have internal predecessors, (28), 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 12:04:55,542 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 53 transitions. [2021-05-02 12:04:55,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 12:04:55,542 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:55,542 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:55,757 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-05-02 12:04:55,757 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:55,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:55,757 INFO L82 PathProgramCache]: Analyzing trace with hash 1350577782, now seen corresponding path program 10 times [2021-05-02 12:04:55,758 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:55,758 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [394114467] [2021-05-02 12:04:55,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:55,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:55,894 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:55,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:55,899 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:04:55,899 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:55,899 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [394114467] [2021-05-02 12:04:55,899 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [394114467] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:55,900 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1662347861] [2021-05-02 12:04:55,900 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 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:04:55,958 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:04:55,958 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:04:55,959 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-02 12:04:55,962 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:04:56,010 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:56,015 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:04:56,015 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1662347861] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:56,015 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:04:56,016 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2021-05-02 12:04:56,016 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [771299421] [2021-05-02 12:04:56,016 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 12:04:56,016 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:56,016 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 12:04:56,016 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2021-05-02 12:04:56,016 INFO L87 Difference]: Start difference. First operand 51 states and 53 transitions. Second operand has 15 states, 15 states have (on average 2.0) internal successors, (30), 14 states have internal predecessors, (30), 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 12:04:56,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:56,429 INFO L93 Difference]: Finished difference Result 59 states and 61 transitions. [2021-05-02 12:04:56,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 12:04:56,429 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 14 states have internal predecessors, (30), 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 31 [2021-05-02 12:04:56,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:56,430 INFO L225 Difference]: With dead ends: 59 [2021-05-02 12:04:56,430 INFO L226 Difference]: Without dead ends: 54 [2021-05-02 12:04:56,430 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 372.7ms TimeCoverageRelationStatistics Valid=108, Invalid=594, Unknown=0, NotChecked=0, Total=702 [2021-05-02 12:04:56,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-05-02 12:04:56,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2021-05-02 12:04:56,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 48 states have (on average 1.0625) internal successors, (51), 48 states have internal predecessors, (51), 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 12:04:56,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 55 transitions. [2021-05-02 12:04:56,435 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 55 transitions. Word has length 31 [2021-05-02 12:04:56,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:56,435 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 55 transitions. [2021-05-02 12:04:56,435 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 14 states have internal predecessors, (30), 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 12:04:56,435 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 55 transitions. [2021-05-02 12:04:56,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 12:04:56,435 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:56,435 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:56,650 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-05-02 12:04:56,650 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:56,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:56,651 INFO L82 PathProgramCache]: Analyzing trace with hash -1593269366, now seen corresponding path program 9 times [2021-05-02 12:04:56,651 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:56,651 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1386677727] [2021-05-02 12:04:56,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:56,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:56,795 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:56,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:56,814 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:04:56,814 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:56,814 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1386677727] [2021-05-02 12:04:56,814 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1386677727] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:56,814 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1968230295] [2021-05-02 12:04:56,814 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 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:04:56,919 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-05-02 12:04:56,919 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:04:56,920 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 26 conjunts are in the unsatisfiable core [2021-05-02 12:04:56,920 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:04:57,000 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:57,006 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:04:57,006 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1968230295] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:57,006 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:04:57,006 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2021-05-02 12:04:57,006 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1565959232] [2021-05-02 12:04:57,007 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 12:04:57,007 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:57,007 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 12:04:57,007 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2021-05-02 12:04:57,007 INFO L87 Difference]: Start difference. First operand 53 states and 55 transitions. Second operand has 15 states, 15 states have (on average 2.0) internal successors, (30), 14 states have internal predecessors, (30), 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 12:04:57,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:57,416 INFO L93 Difference]: Finished difference Result 61 states and 63 transitions. [2021-05-02 12:04:57,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 12:04:57,416 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 14 states have internal predecessors, (30), 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 31 [2021-05-02 12:04:57,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:57,416 INFO L225 Difference]: With dead ends: 61 [2021-05-02 12:04:57,416 INFO L226 Difference]: Without dead ends: 56 [2021-05-02 12:04:57,417 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 29 SyntacticMatches, 4 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 381.4ms TimeCoverageRelationStatistics Valid=93, Invalid=557, Unknown=0, NotChecked=0, Total=650 [2021-05-02 12:04:57,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-05-02 12:04:57,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2021-05-02 12:04:57,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 50 states have (on average 1.06) internal successors, (53), 50 states have internal predecessors, (53), 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 12:04:57,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 57 transitions. [2021-05-02 12:04:57,420 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 57 transitions. Word has length 31 [2021-05-02 12:04:57,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:57,420 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 57 transitions. [2021-05-02 12:04:57,420 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 14 states have internal predecessors, (30), 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 12:04:57,420 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 57 transitions. [2021-05-02 12:04:57,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-02 12:04:57,420 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:57,420 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:57,623 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-02 12:04:57,623 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:57,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:57,624 INFO L82 PathProgramCache]: Analyzing trace with hash 1924349617, now seen corresponding path program 11 times [2021-05-02 12:04:57,624 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:57,624 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [481388591] [2021-05-02 12:04:57,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:57,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:57,759 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:57,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:57,762 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:04:57,762 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:57,762 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [481388591] [2021-05-02 12:04:57,762 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [481388591] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:57,762 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1353091259] [2021-05-02 12:04:57,762 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:04:57,871 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2021-05-02 12:04:57,871 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:04:57,872 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 34 conjunts are in the unsatisfiable core [2021-05-02 12:04:57,872 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:04:57,979 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:57,984 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:04:57,984 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1353091259] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:57,984 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:04:57,984 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2021-05-02 12:04:57,984 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1083760244] [2021-05-02 12:04:57,985 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 12:04:57,985 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:57,985 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 12:04:57,985 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-05-02 12:04:57,985 INFO L87 Difference]: Start difference. First operand 55 states and 57 transitions. Second operand has 16 states, 16 states have (on average 2.0) internal successors, (32), 15 states have internal predecessors, (32), 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 12:04:58,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:58,464 INFO L93 Difference]: Finished difference Result 63 states and 65 transitions. [2021-05-02 12:04:58,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 12:04:58,464 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.0) internal successors, (32), 15 states have internal predecessors, (32), 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 33 [2021-05-02 12:04:58,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:58,464 INFO L225 Difference]: With dead ends: 63 [2021-05-02 12:04:58,465 INFO L226 Difference]: Without dead ends: 58 [2021-05-02 12:04:58,465 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 25 SyntacticMatches, 10 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 483.8ms TimeCoverageRelationStatistics Valid=117, Invalid=695, Unknown=0, NotChecked=0, Total=812 [2021-05-02 12:04:58,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-05-02 12:04:58,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2021-05-02 12:04:58,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 52 states have (on average 1.0576923076923077) internal successors, (55), 52 states have internal predecessors, (55), 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 12:04:58,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 59 transitions. [2021-05-02 12:04:58,468 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 59 transitions. Word has length 33 [2021-05-02 12:04:58,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:58,468 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 59 transitions. [2021-05-02 12:04:58,468 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.0) internal successors, (32), 15 states have internal predecessors, (32), 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 12:04:58,468 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 59 transitions. [2021-05-02 12:04:58,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-02 12:04:58,468 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:58,469 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:58,672 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-05-02 12:04:58,672 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:58,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:58,673 INFO L82 PathProgramCache]: Analyzing trace with hash -1081537145, now seen corresponding path program 10 times [2021-05-02 12:04:58,673 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:58,673 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [589686709] [2021-05-02 12:04:58,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:58,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:58,807 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:58,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:58,817 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:04:58,817 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:58,817 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [589686709] [2021-05-02 12:04:58,817 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [589686709] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:58,818 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [465982816] [2021-05-02 12:04:58,818 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 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:04:58,849 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:04:58,850 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:04:58,850 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 25 conjunts are in the unsatisfiable core [2021-05-02 12:04:58,851 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:04:58,902 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:58,908 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:04:58,908 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [465982816] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:58,908 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:04:58,908 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2021-05-02 12:04:58,908 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [152463421] [2021-05-02 12:04:58,908 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 12:04:58,908 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:58,909 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 12:04:58,909 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-05-02 12:04:58,909 INFO L87 Difference]: Start difference. First operand 57 states and 59 transitions. Second operand has 16 states, 16 states have (on average 2.0) internal successors, (32), 15 states have internal predecessors, (32), 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 12:04:59,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:59,391 INFO L93 Difference]: Finished difference Result 65 states and 67 transitions. [2021-05-02 12:04:59,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 12:04:59,398 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.0) internal successors, (32), 15 states have internal predecessors, (32), 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 33 [2021-05-02 12:04:59,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:59,399 INFO L225 Difference]: With dead ends: 65 [2021-05-02 12:04:59,399 INFO L226 Difference]: Without dead ends: 60 [2021-05-02 12:04:59,399 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 408.4ms TimeCoverageRelationStatistics Valid=101, Invalid=655, Unknown=0, NotChecked=0, Total=756 [2021-05-02 12:04:59,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-05-02 12:04:59,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2021-05-02 12:04:59,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 54 states have (on average 1.0555555555555556) internal successors, (57), 54 states have internal predecessors, (57), 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 12:04:59,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2021-05-02 12:04:59,403 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 33 [2021-05-02 12:04:59,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:59,403 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2021-05-02 12:04:59,403 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.0) internal successors, (32), 15 states have internal predecessors, (32), 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 12:04:59,403 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2021-05-02 12:04:59,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 12:04:59,403 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:59,403 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:59,618 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-05-02 12:04:59,618 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:59,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:59,619 INFO L82 PathProgramCache]: Analyzing trace with hash -731698132, now seen corresponding path program 12 times [2021-05-02 12:04:59,619 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:59,619 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [723088311] [2021-05-02 12:04:59,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:59,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:59,767 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:59,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:59,797 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:04:59,797 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:59,797 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [723088311] [2021-05-02 12:04:59,797 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [723088311] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:59,797 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2042094324] [2021-05-02 12:04:59,797 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:04:59,937 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-05-02 12:04:59,937 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:04:59,938 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-02 12:04:59,938 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:04:59,998 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:00,005 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:00,005 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2042094324] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:00,005 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:05:00,006 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2021-05-02 12:05:00,006 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [685564374] [2021-05-02 12:05:00,006 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 12:05:00,006 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:05:00,006 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 12:05:00,006 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2021-05-02 12:05:00,006 INFO L87 Difference]: Start difference. First operand 59 states and 61 transitions. Second operand has 17 states, 17 states have (on average 2.0) internal successors, (34), 16 states have internal predecessors, (34), 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 12:05:00,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:05:00,607 INFO L93 Difference]: Finished difference Result 67 states and 69 transitions. [2021-05-02 12:05:00,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 12:05:00,608 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0) internal successors, (34), 16 states have internal predecessors, (34), 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 35 [2021-05-02 12:05:00,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:05:00,609 INFO L225 Difference]: With dead ends: 67 [2021-05-02 12:05:00,609 INFO L226 Difference]: Without dead ends: 62 [2021-05-02 12:05:00,609 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 434.8ms TimeCoverageRelationStatistics Valid=126, Invalid=804, Unknown=0, NotChecked=0, Total=930 [2021-05-02 12:05:00,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-05-02 12:05:00,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2021-05-02 12:05:00,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 56 states have (on average 1.0535714285714286) internal successors, (59), 56 states have internal predecessors, (59), 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 12:05:00,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 63 transitions. [2021-05-02 12:05:00,621 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 63 transitions. Word has length 35 [2021-05-02 12:05:00,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:05:00,621 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 63 transitions. [2021-05-02 12:05:00,622 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0) internal successors, (34), 16 states have internal predecessors, (34), 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 12:05:00,622 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 63 transitions. [2021-05-02 12:05:00,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 12:05:00,622 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:05:00,622 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:05:00,825 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:05:00,825 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:05:00,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:05:00,826 INFO L82 PathProgramCache]: Analyzing trace with hash 1066855492, now seen corresponding path program 11 times [2021-05-02 12:05:00,826 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:05:00,826 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1934314609] [2021-05-02 12:05:00,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:05:00,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:00,981 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:05:00,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:00,991 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:00,991 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:05:00,991 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1934314609] [2021-05-02 12:05:00,991 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1934314609] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:00,991 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1538844299] [2021-05-02 12:05:00,991 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:05:01,219 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 13 check-sat command(s) [2021-05-02 12:05:01,219 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:05:01,220 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 39 conjunts are in the unsatisfiable core [2021-05-02 12:05:01,221 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:05:01,370 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:01,378 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:01,379 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1538844299] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:01,379 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:05:01,379 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2021-05-02 12:05:01,379 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [813735457] [2021-05-02 12:05:01,379 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 12:05:01,379 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:05:01,379 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 12:05:01,379 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2021-05-02 12:05:01,380 INFO L87 Difference]: Start difference. First operand 61 states and 63 transitions. Second operand has 17 states, 17 states have (on average 2.0) internal successors, (34), 16 states have internal predecessors, (34), 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 12:05:01,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:05:01,913 INFO L93 Difference]: Finished difference Result 69 states and 71 transitions. [2021-05-02 12:05:01,913 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 12:05:01,913 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0) internal successors, (34), 16 states have internal predecessors, (34), 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 35 [2021-05-02 12:05:01,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:05:01,913 INFO L225 Difference]: With dead ends: 69 [2021-05-02 12:05:01,913 INFO L226 Difference]: Without dead ends: 64 [2021-05-02 12:05:01,914 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 24 SyntacticMatches, 13 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 514.1ms TimeCoverageRelationStatistics Valid=109, Invalid=761, Unknown=0, NotChecked=0, Total=870 [2021-05-02 12:05:01,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-05-02 12:05:01,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2021-05-02 12:05:01,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 58 states have (on average 1.0517241379310345) internal successors, (61), 58 states have internal predecessors, (61), 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 12:05:01,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 65 transitions. [2021-05-02 12:05:01,917 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 65 transitions. Word has length 35 [2021-05-02 12:05:01,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:05:01,917 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 65 transitions. [2021-05-02 12:05:01,917 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0) internal successors, (34), 16 states have internal predecessors, (34), 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 12:05:01,917 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 65 transitions. [2021-05-02 12:05:01,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-02 12:05:01,917 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:05:01,917 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:05:02,118 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-05-02 12:05:02,118 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:05:02,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:05:02,118 INFO L82 PathProgramCache]: Analyzing trace with hash -1983011097, now seen corresponding path program 13 times [2021-05-02 12:05:02,119 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:05:02,119 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1972537101] [2021-05-02 12:05:02,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:05:02,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:02,345 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:05:02,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:02,348 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:02,362 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:05:02,362 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1972537101] [2021-05-02 12:05:02,362 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1972537101] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:02,362 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1118617154] [2021-05-02 12:05:02,362 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:05:02,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:02,398 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 12:05:02,398 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:05:02,482 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:02,488 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:02,488 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1118617154] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:02,488 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:05:02,488 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2021-05-02 12:05:02,489 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [952648847] [2021-05-02 12:05:02,489 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 12:05:02,489 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:05:02,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 12:05:02,489 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2021-05-02 12:05:02,490 INFO L87 Difference]: Start difference. First operand 63 states and 65 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 17 states have internal predecessors, (36), 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 12:05:03,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:05:03,057 INFO L93 Difference]: Finished difference Result 71 states and 73 transitions. [2021-05-02 12:05:03,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 12:05:03,057 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 17 states have internal predecessors, (36), 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 37 [2021-05-02 12:05:03,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:05:03,058 INFO L225 Difference]: With dead ends: 71 [2021-05-02 12:05:03,058 INFO L226 Difference]: Without dead ends: 66 [2021-05-02 12:05:03,058 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 537.5ms TimeCoverageRelationStatistics Valid=135, Invalid=921, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 12:05:03,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-05-02 12:05:03,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2021-05-02 12:05:03,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 60 states have (on average 1.05) internal successors, (63), 60 states have internal predecessors, (63), 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 12:05:03,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 67 transitions. [2021-05-02 12:05:03,062 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 67 transitions. Word has length 37 [2021-05-02 12:05:03,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:05:03,062 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 67 transitions. [2021-05-02 12:05:03,062 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 17 states have internal predecessors, (36), 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 12:05:03,062 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 67 transitions. [2021-05-02 12:05:03,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-02 12:05:03,062 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:05:03,062 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:05:03,277 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:05:03,277 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:05:03,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:05:03,278 INFO L82 PathProgramCache]: Analyzing trace with hash -207089727, now seen corresponding path program 12 times [2021-05-02 12:05:03,278 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:05:03,278 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1238069899] [2021-05-02 12:05:03,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:05:03,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:03,446 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:05:03,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:03,449 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:03,449 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:05:03,449 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1238069899] [2021-05-02 12:05:03,449 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1238069899] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:03,449 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1127248352] [2021-05-02 12:05:03,449 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:05:03,583 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 14 check-sat command(s) [2021-05-02 12:05:03,583 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:05:03,584 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 12:05:03,585 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:05:03,650 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:03,657 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:03,657 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1127248352] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:03,657 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:05:03,657 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2021-05-02 12:05:03,657 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1555413593] [2021-05-02 12:05:03,657 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 12:05:03,657 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:05:03,657 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 12:05:03,658 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2021-05-02 12:05:03,658 INFO L87 Difference]: Start difference. First operand 65 states and 67 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 17 states have internal predecessors, (36), 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 12:05:04,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:05:04,253 INFO L93 Difference]: Finished difference Result 73 states and 75 transitions. [2021-05-02 12:05:04,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 12:05:04,253 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 17 states have internal predecessors, (36), 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 37 [2021-05-02 12:05:04,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:05:04,253 INFO L225 Difference]: With dead ends: 73 [2021-05-02 12:05:04,253 INFO L226 Difference]: Without dead ends: 68 [2021-05-02 12:05:04,254 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 487.1ms TimeCoverageRelationStatistics Valid=117, Invalid=875, Unknown=0, NotChecked=0, Total=992 [2021-05-02 12:05:04,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-05-02 12:05:04,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2021-05-02 12:05:04,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 62 states have (on average 1.0483870967741935) internal successors, (65), 62 states have internal predecessors, (65), 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 12:05:04,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 69 transitions. [2021-05-02 12:05:04,258 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 69 transitions. Word has length 37 [2021-05-02 12:05:04,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:05:04,258 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 69 transitions. [2021-05-02 12:05:04,258 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 17 states have internal predecessors, (36), 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 12:05:04,258 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 69 transitions. [2021-05-02 12:05:04,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 12:05:04,258 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:05:04,258 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:05:04,461 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-02 12:05:04,462 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:05:04,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:05:04,462 INFO L82 PathProgramCache]: Analyzing trace with hash -1903927582, now seen corresponding path program 14 times [2021-05-02 12:05:04,462 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:05:04,462 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [977201411] [2021-05-02 12:05:04,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:05:04,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:04,647 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:05:04,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:04,651 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:04,651 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:05:04,651 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [977201411] [2021-05-02 12:05:04,651 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [977201411] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:04,651 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1550069324] [2021-05-02 12:05:04,651 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 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:05:04,691 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:05:04,691 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:05:04,692 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-02 12:05:04,693 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:05:04,762 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:04,767 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:04,768 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1550069324] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:04,768 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:05:04,768 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2021-05-02 12:05:04,768 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2061801280] [2021-05-02 12:05:04,768 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 12:05:04,768 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:05:04,768 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 12:05:04,768 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2021-05-02 12:05:04,769 INFO L87 Difference]: Start difference. First operand 67 states and 69 transitions. Second operand has 19 states, 19 states have (on average 2.0) internal successors, (38), 18 states have internal predecessors, (38), 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 12:05:05,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:05:05,399 INFO L93 Difference]: Finished difference Result 75 states and 77 transitions. [2021-05-02 12:05:05,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 12:05:05,400 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.0) internal successors, (38), 18 states have internal predecessors, (38), 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 39 [2021-05-02 12:05:05,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:05:05,400 INFO L225 Difference]: With dead ends: 75 [2021-05-02 12:05:05,400 INFO L226 Difference]: Without dead ends: 70 [2021-05-02 12:05:05,400 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 111 ImplicationChecksByTransitivity, 573.5ms TimeCoverageRelationStatistics Valid=144, Invalid=1046, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 12:05:05,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-05-02 12:05:05,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2021-05-02 12:05:05,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 64 states have (on average 1.046875) internal successors, (67), 64 states have internal predecessors, (67), 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 12:05:05,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 71 transitions. [2021-05-02 12:05:05,414 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 71 transitions. Word has length 39 [2021-05-02 12:05:05,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:05:05,414 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 71 transitions. [2021-05-02 12:05:05,414 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 2.0) internal successors, (38), 18 states have internal predecessors, (38), 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 12:05:05,414 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 71 transitions. [2021-05-02 12:05:05,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 12:05:05,414 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:05:05,414 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:05:05,630 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,27 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:05:05,630 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:05:05,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:05:05,630 INFO L82 PathProgramCache]: Analyzing trace with hash -402765826, now seen corresponding path program 13 times [2021-05-02 12:05:05,630 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:05:05,630 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [236094820] [2021-05-02 12:05:05,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:05:05,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:05,817 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:05:05,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:05,819 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:05,819 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:05:05,819 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [236094820] [2021-05-02 12:05:05,819 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [236094820] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:05,820 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1394394617] [2021-05-02 12:05:05,820 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:05:05,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:05,899 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-02 12:05:05,900 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:05:05,960 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:05,965 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:05,965 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1394394617] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:05,965 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:05:05,965 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2021-05-02 12:05:05,965 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1511033457] [2021-05-02 12:05:05,965 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 12:05:05,965 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:05:05,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 12:05:05,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2021-05-02 12:05:05,966 INFO L87 Difference]: Start difference. First operand 69 states and 71 transitions. Second operand has 19 states, 19 states have (on average 2.0) internal successors, (38), 18 states have internal predecessors, (38), 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 12:05:06,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:05:06,609 INFO L93 Difference]: Finished difference Result 77 states and 79 transitions. [2021-05-02 12:05:06,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 12:05:06,609 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.0) internal successors, (38), 18 states have internal predecessors, (38), 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 39 [2021-05-02 12:05:06,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:05:06,610 INFO L225 Difference]: With dead ends: 77 [2021-05-02 12:05:06,610 INFO L226 Difference]: Without dead ends: 72 [2021-05-02 12:05:06,610 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 532.7ms TimeCoverageRelationStatistics Valid=125, Invalid=997, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 12:05:06,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-05-02 12:05:06,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2021-05-02 12:05:06,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 66 states have (on average 1.0454545454545454) internal successors, (69), 66 states have internal predecessors, (69), 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 12:05:06,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 73 transitions. [2021-05-02 12:05:06,614 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 73 transitions. Word has length 39 [2021-05-02 12:05:06,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:05:06,614 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 73 transitions. [2021-05-02 12:05:06,614 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 2.0) internal successors, (38), 18 states have internal predecessors, (38), 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 12:05:06,614 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 73 transitions. [2021-05-02 12:05:06,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 12:05:06,614 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:05:06,614 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:05:06,829 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-05-02 12:05:06,829 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:05:06,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:05:06,829 INFO L82 PathProgramCache]: Analyzing trace with hash 1080886301, now seen corresponding path program 15 times [2021-05-02 12:05:06,830 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:05:06,830 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1938908404] [2021-05-02 12:05:06,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:05:06,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:07,025 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:05:07,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:07,028 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:07,029 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:05:07,029 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1938908404] [2021-05-02 12:05:07,029 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1938908404] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:07,029 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [877736653] [2021-05-02 12:05:07,029 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 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:05:07,196 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2021-05-02 12:05:07,196 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:05:07,197 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 34 conjunts are in the unsatisfiable core [2021-05-02 12:05:07,198 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:05:07,285 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,290 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:07,290 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [877736653] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:07,290 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:05:07,290 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2021-05-02 12:05:07,291 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [994426714] [2021-05-02 12:05:07,291 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 12:05:07,291 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:05:07,291 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 12:05:07,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2021-05-02 12:05:07,291 INFO L87 Difference]: Start difference. First operand 71 states and 73 transitions. Second operand has 20 states, 20 states have (on average 2.0) internal successors, (40), 19 states have internal predecessors, (40), 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 12:05:08,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:05:08,001 INFO L93 Difference]: Finished difference Result 79 states and 81 transitions. [2021-05-02 12:05:08,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 12:05:08,001 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.0) internal successors, (40), 19 states have internal predecessors, (40), 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 41 [2021-05-02 12:05:08,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:05:08,001 INFO L225 Difference]: With dead ends: 79 [2021-05-02 12:05:08,001 INFO L226 Difference]: Without dead ends: 74 [2021-05-02 12:05:08,002 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 640.0ms TimeCoverageRelationStatistics Valid=153, Invalid=1179, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 12:05:08,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-05-02 12:05:08,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2021-05-02 12:05:08,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 68 states have (on average 1.0441176470588236) internal successors, (71), 68 states have internal predecessors, (71), 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 12:05:08,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 75 transitions. [2021-05-02 12:05:08,005 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 75 transitions. Word has length 41 [2021-05-02 12:05:08,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:05:08,005 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 75 transitions. [2021-05-02 12:05:08,005 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 2.0) internal successors, (40), 19 states have internal predecessors, (40), 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 12:05:08,005 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 75 transitions. [2021-05-02 12:05:08,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 12:05:08,006 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:05:08,006 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:05:08,208 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:05:08,209 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:05:08,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:05:08,209 INFO L82 PathProgramCache]: Analyzing trace with hash 531064059, now seen corresponding path program 14 times [2021-05-02 12:05:08,209 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:05:08,209 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [395540699] [2021-05-02 12:05:08,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:05:08,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:08,406 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:05:08,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:08,409 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:08,409 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:05:08,409 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [395540699] [2021-05-02 12:05:08,409 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [395540699] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:08,409 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [93974349] [2021-05-02 12:05:08,409 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 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:05:08,455 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:05:08,455 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:05:08,456 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 33 conjunts are in the unsatisfiable core [2021-05-02 12:05:08,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:05:08,518 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:08,523 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:08,523 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [93974349] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:08,523 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:05:08,524 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2021-05-02 12:05:08,524 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1947967163] [2021-05-02 12:05:08,524 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 12:05:08,524 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:05:08,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 12:05:08,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2021-05-02 12:05:08,524 INFO L87 Difference]: Start difference. First operand 73 states and 75 transitions. Second operand has 20 states, 20 states have (on average 2.0) internal successors, (40), 19 states have internal predecessors, (40), 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 12:05:09,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:05:09,239 INFO L93 Difference]: Finished difference Result 81 states and 83 transitions. [2021-05-02 12:05:09,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 12:05:09,239 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.0) internal successors, (40), 19 states have internal predecessors, (40), 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 41 [2021-05-02 12:05:09,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:05:09,239 INFO L225 Difference]: With dead ends: 81 [2021-05-02 12:05:09,239 INFO L226 Difference]: Without dead ends: 76 [2021-05-02 12:05:09,240 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 594.4ms TimeCoverageRelationStatistics Valid=133, Invalid=1127, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 12:05:09,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-05-02 12:05:09,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2021-05-02 12:05:09,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 70 states have (on average 1.042857142857143) internal successors, (73), 70 states have internal predecessors, (73), 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 12:05:09,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 77 transitions. [2021-05-02 12:05:09,244 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 77 transitions. Word has length 41 [2021-05-02 12:05:09,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:05:09,244 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 77 transitions. [2021-05-02 12:05:09,244 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 2.0) internal successors, (40), 19 states have internal predecessors, (40), 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 12:05:09,244 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 77 transitions. [2021-05-02 12:05:09,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 12:05:09,244 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:05:09,244 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:05:09,459 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-05-02 12:05:09,460 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:05:09,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:05:09,460 INFO L82 PathProgramCache]: Analyzing trace with hash 448874136, now seen corresponding path program 16 times [2021-05-02 12:05:09,460 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:05:09,460 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1073834234] [2021-05-02 12:05:09,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:05:09,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:09,675 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:05:09,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:09,678 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:09,678 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:05:09,678 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1073834234] [2021-05-02 12:05:09,678 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1073834234] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:09,678 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [587735484] [2021-05-02 12:05:09,678 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 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:05:09,723 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:05:09,724 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:05:09,724 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 35 conjunts are in the unsatisfiable core [2021-05-02 12:05:09,725 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:05:09,831 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:09,836 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:09,836 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [587735484] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:09,836 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:05:09,836 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2021-05-02 12:05:09,836 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1917264435] [2021-05-02 12:05:09,837 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 12:05:09,837 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:05:09,837 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 12:05:09,837 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2021-05-02 12:05:09,837 INFO L87 Difference]: Start difference. First operand 75 states and 77 transitions. Second operand has 21 states, 21 states have (on average 2.0) internal successors, (42), 20 states have internal predecessors, (42), 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 12:05:10,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:05:10,578 INFO L93 Difference]: Finished difference Result 83 states and 85 transitions. [2021-05-02 12:05:10,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-02 12:05:10,578 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.0) internal successors, (42), 20 states have internal predecessors, (42), 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 43 [2021-05-02 12:05:10,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:05:10,579 INFO L225 Difference]: With dead ends: 83 [2021-05-02 12:05:10,579 INFO L226 Difference]: Without dead ends: 78 [2021-05-02 12:05:10,579 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 44 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 674.6ms TimeCoverageRelationStatistics Valid=162, Invalid=1320, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 12:05:10,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-05-02 12:05:10,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2021-05-02 12:05:10,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 72 states have (on average 1.0416666666666667) internal successors, (75), 72 states have internal predecessors, (75), 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 12:05:10,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 79 transitions. [2021-05-02 12:05:10,583 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 79 transitions. Word has length 43 [2021-05-02 12:05:10,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:05:10,583 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 79 transitions. [2021-05-02 12:05:10,583 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 2.0) internal successors, (42), 20 states have internal predecessors, (42), 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 12:05:10,583 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 79 transitions. [2021-05-02 12:05:10,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 12:05:10,583 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:05:10,583 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:05:10,798 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:05:10,798 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:05:10,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:05:10,798 INFO L82 PathProgramCache]: Analyzing trace with hash 293418680, now seen corresponding path program 15 times [2021-05-02 12:05:10,799 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:05:10,799 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [814627495] [2021-05-02 12:05:10,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:05:10,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:11,018 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:05:11,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:11,021 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:11,021 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:05:11,021 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [814627495] [2021-05-02 12:05:11,021 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [814627495] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:11,021 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1942669529] [2021-05-02 12:05:11,021 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 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:05:11,162 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2021-05-02 12:05:11,162 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:05:11,163 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 36 conjunts are in the unsatisfiable core [2021-05-02 12:05:11,164 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:05:11,244 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:11,249 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:11,249 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1942669529] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:11,249 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:05:11,249 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2021-05-02 12:05:11,249 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [95217691] [2021-05-02 12:05:11,249 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 12:05:11,249 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:05:11,250 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 12:05:11,250 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2021-05-02 12:05:11,250 INFO L87 Difference]: Start difference. First operand 77 states and 79 transitions. Second operand has 21 states, 21 states have (on average 2.0) internal successors, (42), 20 states have internal predecessors, (42), 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 12:05:12,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:05:12,039 INFO L93 Difference]: Finished difference Result 85 states and 87 transitions. [2021-05-02 12:05:12,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 12:05:12,040 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.0) internal successors, (42), 20 states have internal predecessors, (42), 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 43 [2021-05-02 12:05:12,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:05:12,040 INFO L225 Difference]: With dead ends: 85 [2021-05-02 12:05:12,040 INFO L226 Difference]: Without dead ends: 80 [2021-05-02 12:05:12,041 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 43 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 652.7ms TimeCoverageRelationStatistics Valid=141, Invalid=1265, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 12:05:12,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-05-02 12:05:12,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2021-05-02 12:05:12,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 74 states have (on average 1.0405405405405406) internal successors, (77), 74 states have internal predecessors, (77), 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 12:05:12,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 81 transitions. [2021-05-02 12:05:12,044 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 81 transitions. Word has length 43 [2021-05-02 12:05:12,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:05:12,044 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 81 transitions. [2021-05-02 12:05:12,044 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 2.0) internal successors, (42), 20 states have internal predecessors, (42), 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 12:05:12,044 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 81 transitions. [2021-05-02 12:05:12,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 12:05:12,045 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:05:12,045 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:05:12,247 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-05-02 12:05:12,248 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:05:12,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:05:12,248 INFO L82 PathProgramCache]: Analyzing trace with hash -1324427693, now seen corresponding path program 17 times [2021-05-02 12:05:12,248 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:05:12,248 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1300839607] [2021-05-02 12:05:12,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:05:12,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:12,487 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:05:12,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:12,490 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:12,490 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:05:12,490 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1300839607] [2021-05-02 12:05:12,490 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1300839607] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:12,490 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [304492151] [2021-05-02 12:05:12,490 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:05:12,934 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2021-05-02 12:05:12,934 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:05:12,936 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 47 conjunts are in the unsatisfiable core [2021-05-02 12:05:12,936 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:05:13,076 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:13,080 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:13,081 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [304492151] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:13,081 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:05:13,081 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2021-05-02 12:05:13,081 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1405339495] [2021-05-02 12:05:13,081 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 12:05:13,081 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:05:13,081 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 12:05:13,081 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2021-05-02 12:05:13,081 INFO L87 Difference]: Start difference. First operand 79 states and 81 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 21 states have internal predecessors, (44), 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 12:05:13,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:05:13,899 INFO L93 Difference]: Finished difference Result 87 states and 89 transitions. [2021-05-02 12:05:13,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 12:05:13,899 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 21 states have internal predecessors, (44), 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 45 [2021-05-02 12:05:13,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:05:13,900 INFO L225 Difference]: With dead ends: 87 [2021-05-02 12:05:13,900 INFO L226 Difference]: Without dead ends: 82 [2021-05-02 12:05:13,900 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 36 SyntacticMatches, 11 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 179 ImplicationChecksByTransitivity, 812.3ms TimeCoverageRelationStatistics Valid=171, Invalid=1469, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 12:05:13,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-05-02 12:05:13,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2021-05-02 12:05:13,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 76 states have (on average 1.0394736842105263) internal successors, (79), 76 states have internal predecessors, (79), 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 12:05:13,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 83 transitions. [2021-05-02 12:05:13,904 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 83 transitions. Word has length 45 [2021-05-02 12:05:13,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:05:13,904 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 83 transitions. [2021-05-02 12:05:13,904 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 21 states have internal predecessors, (44), 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 12:05:13,904 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 83 transitions. [2021-05-02 12:05:13,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 12:05:13,904 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:05:13,904 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:05:14,107 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-05-02 12:05:14,107 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:05:14,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:05:14,108 INFO L82 PathProgramCache]: Analyzing trace with hash -450523851, now seen corresponding path program 16 times [2021-05-02 12:05:14,108 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:05:14,108 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1439964019] [2021-05-02 12:05:14,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:05:14,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:14,345 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:05:14,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:14,348 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:14,348 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:05:14,348 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1439964019] [2021-05-02 12:05:14,348 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1439964019] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:14,348 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1392560488] [2021-05-02 12:05:14,348 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 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:05:14,386 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:05:14,386 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:05:14,387 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 37 conjunts are in the unsatisfiable core [2021-05-02 12:05:14,387 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:05:14,460 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:14,465 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:14,466 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1392560488] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:14,466 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:05:14,466 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2021-05-02 12:05:14,466 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [110462114] [2021-05-02 12:05:14,466 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 12:05:14,466 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:05:14,467 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 12:05:14,467 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2021-05-02 12:05:14,467 INFO L87 Difference]: Start difference. First operand 81 states and 83 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 21 states have internal predecessors, (44), 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 12:05:15,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:05:15,310 INFO L93 Difference]: Finished difference Result 89 states and 91 transitions. [2021-05-02 12:05:15,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-02 12:05:15,310 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 21 states have internal predecessors, (44), 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 45 [2021-05-02 12:05:15,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:05:15,311 INFO L225 Difference]: With dead ends: 89 [2021-05-02 12:05:15,311 INFO L226 Difference]: Without dead ends: 84 [2021-05-02 12:05:15,311 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 701.8ms TimeCoverageRelationStatistics Valid=149, Invalid=1411, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 12:05:15,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-05-02 12:05:15,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2021-05-02 12:05:15,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 78 states have (on average 1.0384615384615385) internal successors, (81), 78 states have internal predecessors, (81), 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 12:05:15,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 85 transitions. [2021-05-02 12:05:15,315 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 85 transitions. Word has length 45 [2021-05-02 12:05:15,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:05:15,315 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 85 transitions. [2021-05-02 12:05:15,315 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 21 states have internal predecessors, (44), 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 12:05:15,315 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 85 transitions. [2021-05-02 12:05:15,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 12:05:15,315 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:05:15,315 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:05:15,518 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-05-02 12:05:15,518 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:05:15,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:05:15,519 INFO L82 PathProgramCache]: Analyzing trace with hash -365468850, now seen corresponding path program 18 times [2021-05-02 12:05:15,519 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:05:15,519 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [667877636] [2021-05-02 12:05:15,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:05:15,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:15,792 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:05:15,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:15,795 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:15,795 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:05:15,795 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [667877636] [2021-05-02 12:05:15,795 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [667877636] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:15,795 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1005683058] [2021-05-02 12:05:15,795 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:05:16,020 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2021-05-02 12:05:16,021 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:05:16,022 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 39 conjunts are in the unsatisfiable core [2021-05-02 12:05:16,023 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:05:16,095 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:16,100 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:16,100 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1005683058] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:16,100 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:05:16,100 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2021-05-02 12:05:16,100 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [474491305] [2021-05-02 12:05:16,101 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 12:05:16,101 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:05:16,102 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 12:05:16,102 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2021-05-02 12:05:16,102 INFO L87 Difference]: Start difference. First operand 83 states and 85 transitions. Second operand has 23 states, 23 states have (on average 2.0) internal successors, (46), 22 states have internal predecessors, (46), 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 12:05:17,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:05:17,023 INFO L93 Difference]: Finished difference Result 91 states and 93 transitions. [2021-05-02 12:05:17,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-02 12:05:17,023 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.0) internal successors, (46), 22 states have internal predecessors, (46), 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 47 [2021-05-02 12:05:17,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:05:17,024 INFO L225 Difference]: With dead ends: 91 [2021-05-02 12:05:17,024 INFO L226 Difference]: Without dead ends: 86 [2021-05-02 12:05:17,024 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 177 ImplicationChecksByTransitivity, 808.6ms TimeCoverageRelationStatistics Valid=180, Invalid=1626, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 12:05:17,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-05-02 12:05:17,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2021-05-02 12:05:17,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 80 states have (on average 1.0375) internal successors, (83), 80 states have internal predecessors, (83), 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 12:05:17,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 87 transitions. [2021-05-02 12:05:17,028 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 87 transitions. Word has length 47 [2021-05-02 12:05:17,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:05:17,028 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 87 transitions. [2021-05-02 12:05:17,028 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 2.0) internal successors, (46), 22 states have internal predecessors, (46), 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 12:05:17,028 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 87 transitions. [2021-05-02 12:05:17,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 12:05:17,029 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:05:17,029 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:05:17,232 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-05-02 12:05:17,232 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:05:17,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:05:17,232 INFO L82 PathProgramCache]: Analyzing trace with hash 1880242290, now seen corresponding path program 17 times [2021-05-02 12:05:17,232 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:05:17,232 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [545543597] [2021-05-02 12:05:17,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:05:17,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:17,493 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:05:17,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:17,496 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:17,496 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:05:17,496 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [545543597] [2021-05-02 12:05:17,497 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [545543597] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:17,497 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [576795197] [2021-05-02 12:05:17,497 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:05:18,666 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 19 check-sat command(s) [2021-05-02 12:05:18,666 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:05:18,669 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 55 conjunts are in the unsatisfiable core [2021-05-02 12:05:18,669 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:05:18,906 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:18,911 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:18,912 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [576795197] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:18,912 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:05:18,912 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2021-05-02 12:05:18,912 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1611286185] [2021-05-02 12:05:18,912 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 12:05:18,912 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:05:18,912 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 12:05:18,912 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2021-05-02 12:05:18,913 INFO L87 Difference]: Start difference. First operand 85 states and 87 transitions. Second operand has 23 states, 23 states have (on average 2.0) internal successors, (46), 22 states have internal predecessors, (46), 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 12:05:19,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:05:19,837 INFO L93 Difference]: Finished difference Result 93 states and 95 transitions. [2021-05-02 12:05:19,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 12:05:19,837 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.0) internal successors, (46), 22 states have internal predecessors, (46), 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 47 [2021-05-02 12:05:19,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:05:19,838 INFO L225 Difference]: With dead ends: 93 [2021-05-02 12:05:19,838 INFO L226 Difference]: Without dead ends: 88 [2021-05-02 12:05:19,838 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 32 SyntacticMatches, 17 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 207 ImplicationChecksByTransitivity, 927.0ms TimeCoverageRelationStatistics Valid=157, Invalid=1565, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 12:05:19,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-05-02 12:05:19,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2021-05-02 12:05:19,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 82 states have (on average 1.0365853658536586) internal successors, (85), 82 states have internal predecessors, (85), 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 12:05:19,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 89 transitions. [2021-05-02 12:05:19,842 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 89 transitions. Word has length 47 [2021-05-02 12:05:19,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:05:19,842 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 89 transitions. [2021-05-02 12:05:19,842 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 2.0) internal successors, (46), 22 states have internal predecessors, (46), 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 12:05:19,842 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 89 transitions. [2021-05-02 12:05:19,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-02 12:05:19,843 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:05:19,843 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:05:20,046 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-05-02 12:05:20,046 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:05:20,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:05:20,047 INFO L82 PathProgramCache]: Analyzing trace with hash 2070977929, now seen corresponding path program 19 times [2021-05-02 12:05:20,047 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:05:20,047 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [654325686] [2021-05-02 12:05:20,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:05:20,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:20,345 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:05:20,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:20,349 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:20,349 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:05:20,349 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [654325686] [2021-05-02 12:05:20,349 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [654325686] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:20,349 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [51638022] [2021-05-02 12:05:20,349 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:05:20,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:20,385 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 41 conjunts are in the unsatisfiable core [2021-05-02 12:05:20,385 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:05:20,460 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,464 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:20,464 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [51638022] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:20,464 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:05:20,465 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 24 [2021-05-02 12:05:20,465 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [517809506] [2021-05-02 12:05:20,465 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 12:05:20,465 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:05:20,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 12:05:20,465 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2021-05-02 12:05:20,465 INFO L87 Difference]: Start difference. First operand 87 states and 89 transitions. Second operand has 24 states, 24 states have (on average 2.0) internal successors, (48), 23 states have internal predecessors, (48), 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 12:05:21,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:05:21,488 INFO L93 Difference]: Finished difference Result 95 states and 97 transitions. [2021-05-02 12:05:21,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 12:05:21,488 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.0) internal successors, (48), 23 states have internal predecessors, (48), 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 49 [2021-05-02 12:05:21,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:05:21,489 INFO L225 Difference]: With dead ends: 95 [2021-05-02 12:05:21,489 INFO L226 Difference]: Without dead ends: 90 [2021-05-02 12:05:21,489 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 884.3ms TimeCoverageRelationStatistics Valid=189, Invalid=1791, Unknown=0, NotChecked=0, Total=1980 [2021-05-02 12:05:21,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-05-02 12:05:21,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2021-05-02 12:05:21,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 84 states have (on average 1.0357142857142858) internal successors, (87), 84 states have internal predecessors, (87), 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 12:05:21,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 91 transitions. [2021-05-02 12:05:21,494 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 91 transitions. Word has length 49 [2021-05-02 12:05:21,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:05:21,494 INFO L480 AbstractCegarLoop]: Abstraction has 89 states and 91 transitions. [2021-05-02 12:05:21,494 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 2.0) internal successors, (48), 23 states have internal predecessors, (48), 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 12:05:21,494 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 91 transitions. [2021-05-02 12:05:21,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-02 12:05:21,494 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:05:21,494 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:05:21,707 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-05-02 12:05:21,708 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:05:21,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:05:21,708 INFO L82 PathProgramCache]: Analyzing trace with hash -226424721, now seen corresponding path program 18 times [2021-05-02 12:05:21,708 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:05:21,708 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1361949160] [2021-05-02 12:05:21,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:05:21,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:21,994 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:05:21,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:21,998 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:21,998 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:05:21,998 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1361949160] [2021-05-02 12:05:21,998 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1361949160] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:21,998 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1995774546] [2021-05-02 12:05:21,998 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:05:22,336 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 20 check-sat command(s) [2021-05-02 12:05:22,336 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:05:22,338 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 51 conjunts are in the unsatisfiable core [2021-05-02 12:05:22,338 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:05:22,556 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:22,562 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:22,563 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1995774546] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:22,563 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:05:22,563 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 24 [2021-05-02 12:05:22,563 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1964373661] [2021-05-02 12:05:22,563 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 12:05:22,563 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:05:22,563 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 12:05:22,564 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2021-05-02 12:05:22,564 INFO L87 Difference]: Start difference. First operand 89 states and 91 transitions. Second operand has 24 states, 24 states have (on average 2.0) internal successors, (48), 23 states have internal predecessors, (48), 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 12:05:23,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:05:23,591 INFO L93 Difference]: Finished difference Result 97 states and 99 transitions. [2021-05-02 12:05:23,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-02 12:05:23,591 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.0) internal successors, (48), 23 states have internal predecessors, (48), 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 49 [2021-05-02 12:05:23,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:05:23,592 INFO L225 Difference]: With dead ends: 97 [2021-05-02 12:05:23,592 INFO L226 Difference]: Without dead ends: 92 [2021-05-02 12:05:23,593 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 40 SyntacticMatches, 11 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 214 ImplicationChecksByTransitivity, 973.2ms TimeCoverageRelationStatistics Valid=165, Invalid=1727, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 12:05:23,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-05-02 12:05:23,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2021-05-02 12:05:23,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 86 states have (on average 1.0348837209302326) internal successors, (89), 86 states have internal predecessors, (89), 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 12:05:23,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 93 transitions. [2021-05-02 12:05:23,597 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 93 transitions. Word has length 49 [2021-05-02 12:05:23,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:05:23,597 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 93 transitions. [2021-05-02 12:05:23,597 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 2.0) internal successors, (48), 23 states have internal predecessors, (48), 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 12:05:23,597 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 93 transitions. [2021-05-02 12:05:23,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-02 12:05:23,597 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:05:23,597 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:05:23,801 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable40 [2021-05-02 12:05:23,801 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:05:23,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:05:23,801 INFO L82 PathProgramCache]: Analyzing trace with hash -1555811068, now seen corresponding path program 20 times [2021-05-02 12:05:23,801 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:05:23,801 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [377551831] [2021-05-02 12:05:23,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:05:23,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:24,113 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:05:24,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:24,116 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:24,116 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:05:24,116 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [377551831] [2021-05-02 12:05:24,116 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [377551831] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:24,116 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1631418276] [2021-05-02 12:05:24,117 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 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:05:24,181 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:05:24,181 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:05:24,182 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 43 conjunts are in the unsatisfiable core [2021-05-02 12:05:24,183 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:05:24,260 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:24,265 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:24,265 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1631418276] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:24,265 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:05:24,265 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2021-05-02 12:05:24,265 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1477462062] [2021-05-02 12:05:24,265 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 12:05:24,265 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:05:24,265 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 12:05:24,265 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2021-05-02 12:05:24,266 INFO L87 Difference]: Start difference. First operand 91 states and 93 transitions. Second operand has 25 states, 25 states have (on average 2.0) internal successors, (50), 24 states have internal predecessors, (50), 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 12:05:25,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:05:25,368 INFO L93 Difference]: Finished difference Result 99 states and 101 transitions. [2021-05-02 12:05:25,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-02 12:05:25,368 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.0) internal successors, (50), 24 states have internal predecessors, (50), 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 51 [2021-05-02 12:05:25,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:05:25,369 INFO L225 Difference]: With dead ends: 99 [2021-05-02 12:05:25,369 INFO L226 Difference]: Without dead ends: 94 [2021-05-02 12:05:25,369 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 216 ImplicationChecksByTransitivity, 956.0ms TimeCoverageRelationStatistics Valid=198, Invalid=1964, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 12:05:25,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-05-02 12:05:25,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2021-05-02 12:05:25,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 88 states have (on average 1.0340909090909092) internal successors, (91), 88 states have internal predecessors, (91), 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 12:05:25,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 95 transitions. [2021-05-02 12:05:25,373 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 95 transitions. Word has length 51 [2021-05-02 12:05:25,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:05:25,373 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 95 transitions. [2021-05-02 12:05:25,373 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 2.0) internal successors, (50), 24 states have internal predecessors, (50), 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 12:05:25,374 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 95 transitions. [2021-05-02 12:05:25,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-02 12:05:25,374 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:05:25,374 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:05:25,589 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,39 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:05:25,589 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:05:25,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:05:25,589 INFO L82 PathProgramCache]: Analyzing trace with hash -1803825876, now seen corresponding path program 19 times [2021-05-02 12:05:25,589 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:05:25,589 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1619423419] [2021-05-02 12:05:25,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:05:25,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:25,897 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:05:25,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:25,903 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:25,903 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:05:25,903 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1619423419] [2021-05-02 12:05:25,903 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1619423419] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:25,903 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1078316199] [2021-05-02 12:05:25,903 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:05:25,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:25,983 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 43 conjunts are in the unsatisfiable core [2021-05-02 12:05:25,984 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:05:26,064 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:26,069 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:26,069 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1078316199] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:26,069 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:05:26,069 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2021-05-02 12:05:26,069 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [717235105] [2021-05-02 12:05:26,069 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 12:05:26,069 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:05:26,069 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 12:05:26,070 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2021-05-02 12:05:26,070 INFO L87 Difference]: Start difference. First operand 93 states and 95 transitions. Second operand has 25 states, 25 states have (on average 2.0) internal successors, (50), 24 states have internal predecessors, (50), 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 12:05:27,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:05:27,210 INFO L93 Difference]: Finished difference Result 101 states and 103 transitions. [2021-05-02 12:05:27,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 12:05:27,210 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.0) internal successors, (50), 24 states have internal predecessors, (50), 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 51 [2021-05-02 12:05:27,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:05:27,211 INFO L225 Difference]: With dead ends: 101 [2021-05-02 12:05:27,211 INFO L226 Difference]: Without dead ends: 96 [2021-05-02 12:05:27,211 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 214 ImplicationChecksByTransitivity, 907.2ms TimeCoverageRelationStatistics Valid=173, Invalid=1897, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 12:05:27,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-05-02 12:05:27,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2021-05-02 12:05:27,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 90 states have (on average 1.0333333333333334) internal successors, (93), 90 states have internal predecessors, (93), 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 12:05:27,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 97 transitions. [2021-05-02 12:05:27,216 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 97 transitions. Word has length 51 [2021-05-02 12:05:27,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:05:27,216 INFO L480 AbstractCegarLoop]: Abstraction has 95 states and 97 transitions. [2021-05-02 12:05:27,216 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 2.0) internal successors, (50), 24 states have internal predecessors, (50), 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 12:05:27,216 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 97 transitions. [2021-05-02 12:05:27,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-02 12:05:27,216 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:05:27,216 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:05:27,431 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,40 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:05:27,431 INFO L428 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:05:27,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:05:27,431 INFO L82 PathProgramCache]: Analyzing trace with hash 613407167, now seen corresponding path program 21 times [2021-05-02 12:05:27,431 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:05:27,432 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1487438582] [2021-05-02 12:05:27,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:05:27,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:27,769 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:05:27,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:27,772 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:27,772 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:05:27,772 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1487438582] [2021-05-02 12:05:27,772 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1487438582] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:27,772 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1218180439] [2021-05-02 12:05:27,772 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 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:05:28,044 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2021-05-02 12:05:28,045 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:05:28,046 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 55 conjunts are in the unsatisfiable core [2021-05-02 12:05:28,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:05:28,299 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:28,304 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:28,305 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1218180439] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:28,305 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:05:28,305 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 26 [2021-05-02 12:05:28,305 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1220611765] [2021-05-02 12:05:28,305 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 12:05:28,305 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:05:28,305 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 12:05:28,305 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2021-05-02 12:05:28,305 INFO L87 Difference]: Start difference. First operand 95 states and 97 transitions. Second operand has 26 states, 26 states have (on average 2.0) internal successors, (52), 25 states have internal predecessors, (52), 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 12:05:29,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:05:29,511 INFO L93 Difference]: Finished difference Result 103 states and 105 transitions. [2021-05-02 12:05:29,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 12:05:29,511 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.0) internal successors, (52), 25 states have internal predecessors, (52), 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 53 [2021-05-02 12:05:29,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:05:29,512 INFO L225 Difference]: With dead ends: 103 [2021-05-02 12:05:29,512 INFO L226 Difference]: Without dead ends: 98 [2021-05-02 12:05:29,512 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 44 SyntacticMatches, 11 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 257 ImplicationChecksByTransitivity, 1202.3ms TimeCoverageRelationStatistics Valid=207, Invalid=2145, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 12:05:29,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-05-02 12:05:29,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2021-05-02 12:05:29,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 92 states have (on average 1.0326086956521738) internal successors, (95), 92 states have internal predecessors, (95), 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 12:05:29,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 99 transitions. [2021-05-02 12:05:29,516 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 99 transitions. Word has length 53 [2021-05-02 12:05:29,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:05:29,516 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 99 transitions. [2021-05-02 12:05:29,516 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 2.0) internal successors, (52), 25 states have internal predecessors, (52), 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 12:05:29,517 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 99 transitions. [2021-05-02 12:05:29,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-02 12:05:29,517 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:05:29,517 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:05:29,720 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,41 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:05:29,720 INFO L428 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:05:29,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:05:29,721 INFO L82 PathProgramCache]: Analyzing trace with hash -1562880343, now seen corresponding path program 20 times [2021-05-02 12:05:29,721 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:05:29,721 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1091489052] [2021-05-02 12:05:29,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:05:29,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:30,053 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:05:30,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:30,056 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:30,056 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:05:30,056 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1091489052] [2021-05-02 12:05:30,056 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1091489052] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:30,056 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [926560510] [2021-05-02 12:05:30,056 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 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:05:30,104 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:05:30,104 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:05:30,105 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 45 conjunts are in the unsatisfiable core [2021-05-02 12:05:30,105 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:05:30,193 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:30,197 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:30,198 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [926560510] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:30,198 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:05:30,198 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 26 [2021-05-02 12:05:30,198 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1624544476] [2021-05-02 12:05:30,198 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 12:05:30,198 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:05:30,198 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 12:05:30,198 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2021-05-02 12:05:30,198 INFO L87 Difference]: Start difference. First operand 97 states and 99 transitions. Second operand has 26 states, 26 states have (on average 2.0) internal successors, (52), 25 states have internal predecessors, (52), 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 12:05:31,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:05:31,427 INFO L93 Difference]: Finished difference Result 105 states and 107 transitions. [2021-05-02 12:05:31,427 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-02 12:05:31,428 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.0) internal successors, (52), 25 states have internal predecessors, (52), 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 53 [2021-05-02 12:05:31,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:05:31,428 INFO L225 Difference]: With dead ends: 105 [2021-05-02 12:05:31,428 INFO L226 Difference]: Without dead ends: 100 [2021-05-02 12:05:31,429 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 235 ImplicationChecksByTransitivity, 974.4ms TimeCoverageRelationStatistics Valid=181, Invalid=2075, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 12:05:31,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-05-02 12:05:31,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2021-05-02 12:05:31,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 94 states have (on average 1.0319148936170213) internal successors, (97), 94 states have internal predecessors, (97), 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 12:05:31,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 101 transitions. [2021-05-02 12:05:31,433 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 101 transitions. Word has length 53 [2021-05-02 12:05:31,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:05:31,435 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 101 transitions. [2021-05-02 12:05:31,435 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 2.0) internal successors, (52), 25 states have internal predecessors, (52), 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 12:05:31,435 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 101 transitions. [2021-05-02 12:05:31,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-02 12:05:31,435 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:05:31,435 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:05:31,650 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2021-05-02 12:05:31,650 INFO L428 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:05:31,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:05:31,651 INFO L82 PathProgramCache]: Analyzing trace with hash -2121974854, now seen corresponding path program 22 times [2021-05-02 12:05:31,651 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:05:31,651 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1212976754] [2021-05-02 12:05:31,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:05:31,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:32,024 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:05:32,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:32,027 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:32,027 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:05:32,027 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1212976754] [2021-05-02 12:05:32,028 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1212976754] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:32,029 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1403227422] [2021-05-02 12:05:32,029 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 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:05:32,065 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:05:32,066 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:05:32,067 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 47 conjunts are in the unsatisfiable core [2021-05-02 12:05:32,067 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:05:32,152 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:32,157 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:32,157 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1403227422] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:32,157 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:05:32,157 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25] total 27 [2021-05-02 12:05:32,157 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [258247600] [2021-05-02 12:05:32,158 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-02 12:05:32,158 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:05:32,158 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-02 12:05:32,158 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2021-05-02 12:05:32,158 INFO L87 Difference]: Start difference. First operand 99 states and 101 transitions. Second operand has 27 states, 27 states have (on average 2.0) internal successors, (54), 26 states have internal predecessors, (54), 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 12:05:33,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:05:33,411 INFO L93 Difference]: Finished difference Result 107 states and 109 transitions. [2021-05-02 12:05:33,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 12:05:33,411 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.0) internal successors, (54), 26 states have internal predecessors, (54), 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 55 [2021-05-02 12:05:33,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:05:33,412 INFO L225 Difference]: With dead ends: 107 [2021-05-02 12:05:33,412 INFO L226 Difference]: Without dead ends: 102 [2021-05-02 12:05:33,413 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 259 ImplicationChecksByTransitivity, 1094.6ms TimeCoverageRelationStatistics Valid=216, Invalid=2334, Unknown=0, NotChecked=0, Total=2550 [2021-05-02 12:05:33,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2021-05-02 12:05:33,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2021-05-02 12:05:33,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 96 states have (on average 1.03125) internal successors, (99), 96 states have internal predecessors, (99), 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 12:05:33,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 103 transitions. [2021-05-02 12:05:33,417 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 103 transitions. Word has length 55 [2021-05-02 12:05:33,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:05:33,417 INFO L480 AbstractCegarLoop]: Abstraction has 101 states and 103 transitions. [2021-05-02 12:05:33,417 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 2.0) internal successors, (54), 26 states have internal predecessors, (54), 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 12:05:33,417 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 103 transitions. [2021-05-02 12:05:33,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-02 12:05:33,417 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:05:33,418 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:05:33,633 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45,43 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:05:33,633 INFO L428 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:05:33,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:05:33,634 INFO L82 PathProgramCache]: Analyzing trace with hash -1942457114, now seen corresponding path program 21 times [2021-05-02 12:05:33,634 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:05:33,634 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [479378893] [2021-05-02 12:05:33,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:05:33,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:33,998 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:05:33,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:34,002 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:34,002 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:05:34,002 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [479378893] [2021-05-02 12:05:34,002 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [479378893] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:34,002 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [312430809] [2021-05-02 12:05:34,002 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 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:05:34,309 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2021-05-02 12:05:34,310 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:05:34,311 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 53 conjunts are in the unsatisfiable core [2021-05-02 12:05:34,312 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:05:34,514 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:34,520 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:34,520 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [312430809] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:34,520 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:05:34,520 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25] total 27 [2021-05-02 12:05:34,520 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [919645362] [2021-05-02 12:05:34,520 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-02 12:05:34,520 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:05:34,520 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-02 12:05:34,520 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2021-05-02 12:05:34,521 INFO L87 Difference]: Start difference. First operand 101 states and 103 transitions. Second operand has 27 states, 27 states have (on average 2.0) internal successors, (54), 26 states have internal predecessors, (54), 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 12:05:35,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:05:35,881 INFO L93 Difference]: Finished difference Result 109 states and 111 transitions. [2021-05-02 12:05:35,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 12:05:35,882 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.0) internal successors, (54), 26 states have internal predecessors, (54), 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 55 [2021-05-02 12:05:35,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:05:35,882 INFO L225 Difference]: With dead ends: 109 [2021-05-02 12:05:35,882 INFO L226 Difference]: Without dead ends: 104 [2021-05-02 12:05:35,883 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 50 SyntacticMatches, 7 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 269 ImplicationChecksByTransitivity, 1171.3ms TimeCoverageRelationStatistics Valid=189, Invalid=2261, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 12:05:35,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-05-02 12:05:35,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2021-05-02 12:05:35,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 98 states have (on average 1.030612244897959) internal successors, (101), 98 states have internal predecessors, (101), 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 12:05:35,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 105 transitions. [2021-05-02 12:05:35,887 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 105 transitions. Word has length 55 [2021-05-02 12:05:35,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:05:35,888 INFO L480 AbstractCegarLoop]: Abstraction has 103 states and 105 transitions. [2021-05-02 12:05:35,888 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 2.0) internal successors, (54), 26 states have internal predecessors, (54), 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 12:05:35,888 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 105 transitions. [2021-05-02 12:05:35,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-02 12:05:35,888 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:05:35,888 INFO L523 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:05:36,091 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46,44 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:05:36,092 INFO L428 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:05:36,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:05:36,092 INFO L82 PathProgramCache]: Analyzing trace with hash 1990855413, now seen corresponding path program 23 times [2021-05-02 12:05:36,092 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:05:36,092 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [49843066] [2021-05-02 12:05:36,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:05:36,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:36,487 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:05:36,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:36,490 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:36,490 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:05:36,490 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [49843066] [2021-05-02 12:05:36,490 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [49843066] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:36,490 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [22664743] [2021-05-02 12:05:36,491 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:05:38,813 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 24 check-sat command(s) [2021-05-02 12:05:38,813 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:05:38,821 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 65 conjunts are in the unsatisfiable core [2021-05-02 12:05:38,821 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:05:39,133 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:39,138 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:39,138 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [22664743] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:39,138 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:05:39,138 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 28 [2021-05-02 12:05:39,138 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1968495863] [2021-05-02 12:05:39,138 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 12:05:39,138 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:05:39,139 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 12:05:39,139 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2021-05-02 12:05:39,139 INFO L87 Difference]: Start difference. First operand 103 states and 105 transitions. Second operand has 28 states, 28 states have (on average 2.0) internal successors, (56), 27 states have internal predecessors, (56), 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 12:05:40,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:05:40,491 INFO L93 Difference]: Finished difference Result 111 states and 113 transitions. [2021-05-02 12:05:40,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-02 12:05:40,492 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.0) internal successors, (56), 27 states have internal predecessors, (56), 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 57 [2021-05-02 12:05:40,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:05:40,492 INFO L225 Difference]: With dead ends: 111 [2021-05-02 12:05:40,492 INFO L226 Difference]: Without dead ends: 106 [2021-05-02 12:05:40,493 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 42 SyntacticMatches, 17 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 314 ImplicationChecksByTransitivity, 1372.0ms TimeCoverageRelationStatistics Valid=225, Invalid=2531, Unknown=0, NotChecked=0, Total=2756 [2021-05-02 12:05:40,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2021-05-02 12:05:40,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2021-05-02 12:05:40,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 100 states have (on average 1.03) internal successors, (103), 100 states have internal predecessors, (103), 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 12:05:40,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 107 transitions. [2021-05-02 12:05:40,497 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 107 transitions. Word has length 57 [2021-05-02 12:05:40,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:05:40,497 INFO L480 AbstractCegarLoop]: Abstraction has 105 states and 107 transitions. [2021-05-02 12:05:40,497 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 2.0) internal successors, (56), 27 states have internal predecessors, (56), 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 12:05:40,497 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 107 transitions. [2021-05-02 12:05:40,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-02 12:05:40,498 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:05:40,498 INFO L523 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:05:40,701 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-05-02 12:05:40,701 INFO L428 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:05:40,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:05:40,701 INFO L82 PathProgramCache]: Analyzing trace with hash -1643513885, now seen corresponding path program 22 times [2021-05-02 12:05:40,701 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:05:40,701 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [407745767] [2021-05-02 12:05:40,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:05:40,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:41,080 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:05:41,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:41,084 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:41,084 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:05:41,084 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [407745767] [2021-05-02 12:05:41,084 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [407745767] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:41,084 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [63870862] [2021-05-02 12:05:41,084 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 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:05:41,137 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:05:41,137 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:05:41,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 49 conjunts are in the unsatisfiable core [2021-05-02 12:05:41,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:05:41,225 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:41,230 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:41,230 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [63870862] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:41,230 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:05:41,230 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 28 [2021-05-02 12:05:41,230 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1748739805] [2021-05-02 12:05:41,230 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 12:05:41,230 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:05:41,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 12:05:41,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2021-05-02 12:05:41,231 INFO L87 Difference]: Start difference. First operand 105 states and 107 transitions. Second operand has 28 states, 28 states have (on average 2.0) internal successors, (56), 27 states have internal predecessors, (56), 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 12:05:42,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:05:42,629 INFO L93 Difference]: Finished difference Result 113 states and 115 transitions. [2021-05-02 12:05:42,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 12:05:42,629 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.0) internal successors, (56), 27 states have internal predecessors, (56), 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 57 [2021-05-02 12:05:42,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:05:42,629 INFO L225 Difference]: With dead ends: 113 [2021-05-02 12:05:42,629 INFO L226 Difference]: Without dead ends: 108 [2021-05-02 12:05:42,630 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 58 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 280 ImplicationChecksByTransitivity, 1096.1ms TimeCoverageRelationStatistics Valid=197, Invalid=2455, Unknown=0, NotChecked=0, Total=2652 [2021-05-02 12:05:42,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2021-05-02 12:05:42,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2021-05-02 12:05:42,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 102 states have (on average 1.0294117647058822) internal successors, (105), 102 states have internal predecessors, (105), 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 12:05:42,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 109 transitions. [2021-05-02 12:05:42,635 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 109 transitions. Word has length 57 [2021-05-02 12:05:42,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:05:42,635 INFO L480 AbstractCegarLoop]: Abstraction has 107 states and 109 transitions. [2021-05-02 12:05:42,635 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 2.0) internal successors, (56), 27 states have internal predecessors, (56), 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 12:05:42,635 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 109 transitions. [2021-05-02 12:05:42,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 12:05:42,635 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:05:42,635 INFO L523 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:05:42,850 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-05-02 12:05:42,850 INFO L428 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:05:42,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:05:42,850 INFO L82 PathProgramCache]: Analyzing trace with hash -1244137616, now seen corresponding path program 24 times [2021-05-02 12:05:42,850 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:05:42,851 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1771041800] [2021-05-02 12:05:42,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:05:42,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:43,251 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:05:43,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:43,254 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:43,254 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:05:43,254 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1771041800] [2021-05-02 12:05:43,254 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1771041800] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:43,254 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [925515059] [2021-05-02 12:05:43,254 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:05:43,945 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2021-05-02 12:05:43,945 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:05:43,947 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 62 conjunts are in the unsatisfiable core [2021-05-02 12:05:43,948 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:05:44,209 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:44,214 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:44,214 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [925515059] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:44,214 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:05:44,214 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27] total 29 [2021-05-02 12:05:44,214 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1448882902] [2021-05-02 12:05:44,215 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-02 12:05:44,215 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:05:44,215 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-02 12:05:44,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2021-05-02 12:05:44,216 INFO L87 Difference]: Start difference. First operand 107 states and 109 transitions. Second operand has 29 states, 29 states have (on average 2.0) internal successors, (58), 28 states have internal predecessors, (58), 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 12:05:45,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:05:45,518 INFO L93 Difference]: Finished difference Result 115 states and 117 transitions. [2021-05-02 12:05:45,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-02 12:05:45,518 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.0) internal successors, (58), 28 states have internal predecessors, (58), 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 59 [2021-05-02 12:05:45,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:05:45,519 INFO L225 Difference]: With dead ends: 115 [2021-05-02 12:05:45,519 INFO L226 Difference]: Without dead ends: 110 [2021-05-02 12:05:45,519 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 49 SyntacticMatches, 12 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 328 ImplicationChecksByTransitivity, 1300.2ms TimeCoverageRelationStatistics Valid=234, Invalid=2736, Unknown=0, NotChecked=0, Total=2970 [2021-05-02 12:05:45,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-05-02 12:05:45,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 109. [2021-05-02 12:05:45,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 104 states have (on average 1.0288461538461537) internal successors, (107), 104 states have internal predecessors, (107), 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 12:05:45,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 111 transitions. [2021-05-02 12:05:45,523 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 111 transitions. Word has length 59 [2021-05-02 12:05:45,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:05:45,524 INFO L480 AbstractCegarLoop]: Abstraction has 109 states and 111 transitions. [2021-05-02 12:05:45,524 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 2.0) internal successors, (58), 28 states have internal predecessors, (58), 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 12:05:45,524 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 111 transitions. [2021-05-02 12:05:45,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 12:05:45,524 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:05:45,524 INFO L523 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:05:45,729 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-05-02 12:05:45,729 INFO L428 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:05:45,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:05:45,729 INFO L82 PathProgramCache]: Analyzing trace with hash -2121879648, now seen corresponding path program 23 times [2021-05-02 12:05:45,730 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:05:45,730 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [729268012] [2021-05-02 12:05:45,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:05:45,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:46,137 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:05:46,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:46,140 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:46,140 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:05:46,140 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [729268012] [2021-05-02 12:05:46,140 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [729268012] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:46,140 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [956081728] [2021-05-02 12:05:46,140 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:05:49,206 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 25 check-sat command(s) [2021-05-02 12:05:49,206 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:05:49,209 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 74 conjunts are in the unsatisfiable core [2021-05-02 12:05:49,210 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:05:49,686 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:49,691 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:49,691 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [956081728] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:49,691 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:05:49,691 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27] total 29 [2021-05-02 12:05:49,691 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1953189298] [2021-05-02 12:05:49,691 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-02 12:05:49,691 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:05:49,691 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-02 12:05:49,691 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2021-05-02 12:05:49,691 INFO L87 Difference]: Start difference. First operand 109 states and 111 transitions. Second operand has 29 states, 29 states have (on average 2.0) internal successors, (58), 28 states have internal predecessors, (58), 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 12:05:51,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:05:51,149 INFO L93 Difference]: Finished difference Result 117 states and 119 transitions. [2021-05-02 12:05:51,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-02 12:05:51,150 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.0) internal successors, (58), 28 states have internal predecessors, (58), 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 59 [2021-05-02 12:05:51,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:05:51,151 INFO L225 Difference]: With dead ends: 117 [2021-05-02 12:05:51,151 INFO L226 Difference]: Without dead ends: 112 [2021-05-02 12:05:51,151 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 37 SyntacticMatches, 24 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 350 ImplicationChecksByTransitivity, 1530.8ms TimeCoverageRelationStatistics Valid=205, Invalid=2657, Unknown=0, NotChecked=0, Total=2862 [2021-05-02 12:05:51,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2021-05-02 12:05:51,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 111. [2021-05-02 12:05:51,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 106 states have (on average 1.028301886792453) internal successors, (109), 106 states have internal predecessors, (109), 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 12:05:51,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 113 transitions. [2021-05-02 12:05:51,156 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 113 transitions. Word has length 59 [2021-05-02 12:05:51,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:05:51,156 INFO L480 AbstractCegarLoop]: Abstraction has 111 states and 113 transitions. [2021-05-02 12:05:51,156 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 2.0) internal successors, (58), 28 states have internal predecessors, (58), 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 12:05:51,157 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 113 transitions. [2021-05-02 12:05:51,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-02 12:05:51,157 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:05:51,157 INFO L523 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:05:51,361 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,48 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:05:51,361 INFO L428 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:05:51,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:05:51,362 INFO L82 PathProgramCache]: Analyzing trace with hash -516116181, now seen corresponding path program 25 times [2021-05-02 12:05:51,362 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:05:51,362 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [294760274] [2021-05-02 12:05:51,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:05:51,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:51,787 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:05:51,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:51,800 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:51,800 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:05:51,800 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [294760274] [2021-05-02 12:05:51,800 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [294760274] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:51,800 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [184836206] [2021-05-02 12:05:51,800 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:05:51,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:51,839 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 53 conjunts are in the unsatisfiable core [2021-05-02 12:05:51,839 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:05:51,929 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:51,936 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:51,936 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [184836206] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:51,936 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:05:51,936 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 30 [2021-05-02 12:05:51,936 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [908022821] [2021-05-02 12:05:51,937 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-02 12:05:51,937 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:05:51,937 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-02 12:05:51,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2021-05-02 12:05:51,937 INFO L87 Difference]: Start difference. First operand 111 states and 113 transitions. Second operand has 30 states, 30 states have (on average 2.0) internal successors, (60), 29 states have internal predecessors, (60), 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 12:05:53,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:05:53,217 INFO L93 Difference]: Finished difference Result 119 states and 121 transitions. [2021-05-02 12:05:53,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-02 12:05:53,217 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.0) internal successors, (60), 29 states have internal predecessors, (60), 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 61 [2021-05-02 12:05:53,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:05:53,218 INFO L225 Difference]: With dead ends: 119 [2021-05-02 12:05:53,218 INFO L226 Difference]: Without dead ends: 114 [2021-05-02 12:05:53,218 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 62 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 331 ImplicationChecksByTransitivity, 1166.9ms TimeCoverageRelationStatistics Valid=243, Invalid=2949, Unknown=0, NotChecked=0, Total=3192 [2021-05-02 12:05:53,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2021-05-02 12:05:53,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 113. [2021-05-02 12:05:53,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 108 states have (on average 1.0277777777777777) internal successors, (111), 108 states have internal predecessors, (111), 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 12:05:53,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 115 transitions. [2021-05-02 12:05:53,222 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 115 transitions. Word has length 61 [2021-05-02 12:05:53,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:05:53,222 INFO L480 AbstractCegarLoop]: Abstraction has 113 states and 115 transitions. [2021-05-02 12:05:53,223 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 2.0) internal successors, (60), 29 states have internal predecessors, (60), 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 12:05:53,223 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 115 transitions. [2021-05-02 12:05:53,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-02 12:05:53,223 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:05:53,223 INFO L523 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:05:53,438 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,49 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:05:53,438 INFO L428 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:05:53,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:05:53,438 INFO L82 PathProgramCache]: Analyzing trace with hash 2025090077, now seen corresponding path program 24 times [2021-05-02 12:05:53,438 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:05:53,438 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1242610413] [2021-05-02 12:05:53,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:05:53,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:53,886 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:05:53,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:53,888 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:53,889 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:05:53,889 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1242610413] [2021-05-02 12:05:53,889 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1242610413] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:53,889 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [86889858] [2021-05-02 12:05:53,889 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:05:54,320 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 26 check-sat command(s) [2021-05-02 12:05:54,320 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:05:54,322 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 68 conjunts are in the unsatisfiable core [2021-05-02 12:05:54,323 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:05:54,649 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:54,655 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:54,655 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [86889858] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:54,655 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:05:54,655 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 30 [2021-05-02 12:05:54,655 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2136222311] [2021-05-02 12:05:54,655 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-02 12:05:54,655 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:05:54,655 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-02 12:05:54,656 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2021-05-02 12:05:54,656 INFO L87 Difference]: Start difference. First operand 113 states and 115 transitions. Second operand has 30 states, 30 states have (on average 2.0) internal successors, (60), 29 states have internal predecessors, (60), 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 12:05:56,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:05:56,112 INFO L93 Difference]: Finished difference Result 121 states and 123 transitions. [2021-05-02 12:05:56,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-02 12:05:56,112 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.0) internal successors, (60), 29 states have internal predecessors, (60), 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 61 [2021-05-02 12:05:56,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:05:56,113 INFO L225 Difference]: With dead ends: 121 [2021-05-02 12:05:56,113 INFO L226 Difference]: Without dead ends: 116 [2021-05-02 12:05:56,113 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 47 SyntacticMatches, 16 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 359 ImplicationChecksByTransitivity, 1389.1ms TimeCoverageRelationStatistics Valid=213, Invalid=2867, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 12:05:56,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-05-02 12:05:56,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 115. [2021-05-02 12:05:56,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 110 states have (on average 1.0272727272727273) internal successors, (113), 110 states have internal predecessors, (113), 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 12:05:56,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 117 transitions. [2021-05-02 12:05:56,117 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 117 transitions. Word has length 61 [2021-05-02 12:05:56,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:05:56,118 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 117 transitions. [2021-05-02 12:05:56,118 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 2.0) internal successors, (60), 29 states have internal predecessors, (60), 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 12:05:56,118 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 117 transitions. [2021-05-02 12:05:56,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-02 12:05:56,118 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:05:56,118 INFO L523 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:05:56,318 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable52 [2021-05-02 12:05:56,319 INFO L428 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:05:56,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:05:56,319 INFO L82 PathProgramCache]: Analyzing trace with hash -967186394, now seen corresponding path program 26 times [2021-05-02 12:05:56,319 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:05:56,319 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1830465217] [2021-05-02 12:05:56,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:05:56,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:56,790 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:05:56,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:56,793 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:56,793 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:05:56,793 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1830465217] [2021-05-02 12:05:56,793 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1830465217] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:56,793 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1345316972] [2021-05-02 12:05:56,793 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 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:05:56,842 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:05:56,842 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:05:56,843 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 55 conjunts are in the unsatisfiable core [2021-05-02 12:05:56,844 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:05:56,941 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:56,945 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:56,945 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1345316972] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:56,945 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:05:56,945 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29] total 31 [2021-05-02 12:05:56,946 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2088963182] [2021-05-02 12:05:56,946 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-02 12:05:56,946 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:05:56,946 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-02 12:05:56,946 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2021-05-02 12:05:56,946 INFO L87 Difference]: Start difference. First operand 115 states and 117 transitions. Second operand has 31 states, 31 states have (on average 2.0) internal successors, (62), 30 states have internal predecessors, (62), 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 12:05:58,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:05:58,466 INFO L93 Difference]: Finished difference Result 123 states and 125 transitions. [2021-05-02 12:05:58,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-02 12:05:58,466 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.0) internal successors, (62), 30 states have internal predecessors, (62), 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 63 [2021-05-02 12:05:58,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:05:58,467 INFO L225 Difference]: With dead ends: 123 [2021-05-02 12:05:58,467 INFO L226 Difference]: Without dead ends: 118 [2021-05-02 12:05:58,467 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 64 SyntacticMatches, 1 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 357 ImplicationChecksByTransitivity, 1322.0ms TimeCoverageRelationStatistics Valid=252, Invalid=3170, Unknown=0, NotChecked=0, Total=3422 [2021-05-02 12:05:58,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2021-05-02 12:05:58,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 117. [2021-05-02 12:05:58,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 112 states have (on average 1.0267857142857142) internal successors, (115), 112 states have internal predecessors, (115), 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 12:05:58,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 119 transitions. [2021-05-02 12:05:58,472 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 119 transitions. Word has length 63 [2021-05-02 12:05:58,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:05:58,472 INFO L480 AbstractCegarLoop]: Abstraction has 117 states and 119 transitions. [2021-05-02 12:05:58,472 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 2.0) internal successors, (62), 30 states have internal predecessors, (62), 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 12:05:58,472 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 119 transitions. [2021-05-02 12:05:58,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-02 12:05:58,472 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:05:58,472 INFO L523 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:05:58,681 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,51 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:05:58,681 INFO L428 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:05:58,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:05:58,681 INFO L82 PathProgramCache]: Analyzing trace with hash 1533345114, now seen corresponding path program 25 times [2021-05-02 12:05:58,681 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:05:58,681 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [106174896] [2021-05-02 12:05:58,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:05:58,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:59,146 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:05:59,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:59,148 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:59,148 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:05:59,148 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [106174896] [2021-05-02 12:05:59,149 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [106174896] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:59,149 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [633044489] [2021-05-02 12:05:59,149 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:05:59,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:59,188 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 55 conjunts are in the unsatisfiable core [2021-05-02 12:05:59,189 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:05:59,285 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:59,289 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:05:59,289 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [633044489] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:59,289 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:05:59,289 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29] total 31 [2021-05-02 12:05:59,289 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [725043913] [2021-05-02 12:05:59,290 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-02 12:05:59,290 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:05:59,290 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-02 12:05:59,290 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2021-05-02 12:05:59,290 INFO L87 Difference]: Start difference. First operand 117 states and 119 transitions. Second operand has 31 states, 31 states have (on average 2.0) internal successors, (62), 30 states have internal predecessors, (62), 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 12:06:01,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:06:01,023 INFO L93 Difference]: Finished difference Result 125 states and 127 transitions. [2021-05-02 12:06:01,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-02 12:06:01,023 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.0) internal successors, (62), 30 states have internal predecessors, (62), 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 63 [2021-05-02 12:06:01,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:06:01,024 INFO L225 Difference]: With dead ends: 125 [2021-05-02 12:06:01,024 INFO L226 Difference]: Without dead ends: 120 [2021-05-02 12:06:01,024 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 64 SyntacticMatches, 1 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 355 ImplicationChecksByTransitivity, 1327.2ms TimeCoverageRelationStatistics Valid=221, Invalid=3085, Unknown=0, NotChecked=0, Total=3306 [2021-05-02 12:06:01,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-05-02 12:06:01,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 119. [2021-05-02 12:06:01,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 114 states have (on average 1.0263157894736843) internal successors, (117), 114 states have internal predecessors, (117), 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 12:06:01,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 121 transitions. [2021-05-02 12:06:01,028 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 121 transitions. Word has length 63 [2021-05-02 12:06:01,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:06:01,028 INFO L480 AbstractCegarLoop]: Abstraction has 119 states and 121 transitions. [2021-05-02 12:06:01,029 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 2.0) internal successors, (62), 30 states have internal predecessors, (62), 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 12:06:01,029 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 121 transitions. [2021-05-02 12:06:01,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-05-02 12:06:01,029 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:06:01,029 INFO L523 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:06:01,243 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2021-05-02 12:06:01,244 INFO L428 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:06:01,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:06:01,244 INFO L82 PathProgramCache]: Analyzing trace with hash -653964191, now seen corresponding path program 27 times [2021-05-02 12:06:01,244 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:06:01,244 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [238855518] [2021-05-02 12:06:01,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:06:01,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:06:01,731 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:06:01,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:06:01,734 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:06:01,734 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:06:01,734 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [238855518] [2021-05-02 12:06:01,734 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [238855518] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:06:01,734 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1910689072] [2021-05-02 12:06:01,734 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 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:06:02,010 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2021-05-02 12:06:02,010 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:06:02,012 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 64 conjunts are in the unsatisfiable core [2021-05-02 12:06:02,012 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:06:02,272 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:06:02,276 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:06:02,276 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1910689072] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:06:02,276 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:06:02,276 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 32 [2021-05-02 12:06:02,276 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [981397550] [2021-05-02 12:06:02,277 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-02 12:06:02,277 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:06:02,277 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-02 12:06:02,277 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2021-05-02 12:06:02,277 INFO L87 Difference]: Start difference. First operand 119 states and 121 transitions. Second operand has 32 states, 32 states have (on average 2.0) internal successors, (64), 31 states have internal predecessors, (64), 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 12:06:03,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:06:03,395 INFO L93 Difference]: Finished difference Result 127 states and 129 transitions. [2021-05-02 12:06:03,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-02 12:06:03,396 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.0) internal successors, (64), 31 states have internal predecessors, (64), 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 65 [2021-05-02 12:06:03,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:06:03,396 INFO L225 Difference]: With dead ends: 127 [2021-05-02 12:06:03,396 INFO L226 Difference]: Without dead ends: 122 [2021-05-02 12:06:03,396 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 59 SyntacticMatches, 8 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 398 ImplicationChecksByTransitivity, 1257.7ms TimeCoverageRelationStatistics Valid=261, Invalid=3399, Unknown=0, NotChecked=0, Total=3660 [2021-05-02 12:06:03,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-05-02 12:06:03,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 121. [2021-05-02 12:06:03,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 116 states have (on average 1.0258620689655173) internal successors, (119), 116 states have internal predecessors, (119), 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 12:06:03,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 123 transitions. [2021-05-02 12:06:03,401 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 123 transitions. Word has length 65 [2021-05-02 12:06:03,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:06:03,401 INFO L480 AbstractCegarLoop]: Abstraction has 121 states and 123 transitions. [2021-05-02 12:06:03,401 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 2.0) internal successors, (64), 31 states have internal predecessors, (64), 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 12:06:03,401 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 123 transitions. [2021-05-02 12:06:03,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-05-02 12:06:03,402 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:06:03,402 INFO L523 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:06:03,605 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable55 [2021-05-02 12:06:03,605 INFO L428 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:06:03,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:06:03,605 INFO L82 PathProgramCache]: Analyzing trace with hash 1412838231, now seen corresponding path program 26 times [2021-05-02 12:06:03,605 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:06:03,606 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1558015905] [2021-05-02 12:06:03,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:06:03,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:06:04,005 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:06:04,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:06:04,008 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:06:04,008 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:06:04,008 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1558015905] [2021-05-02 12:06:04,008 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1558015905] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:06:04,008 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [878703630] [2021-05-02 12:06:04,008 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 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:06:04,055 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:06:04,056 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:06:04,056 INFO L263 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 57 conjunts are in the unsatisfiable core [2021-05-02 12:06:04,057 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:06:04,150 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:06:04,158 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:06:04,158 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [878703630] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:06:04,158 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:06:04,158 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 32 [2021-05-02 12:06:04,158 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2120104034] [2021-05-02 12:06:04,158 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-02 12:06:04,158 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:06:04,159 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-02 12:06:04,159 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2021-05-02 12:06:04,159 INFO L87 Difference]: Start difference. First operand 121 states and 123 transitions. Second operand has 32 states, 32 states have (on average 2.0) internal successors, (64), 31 states have internal predecessors, (64), 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 12:06:05,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:06:05,773 INFO L93 Difference]: Finished difference Result 129 states and 131 transitions. [2021-05-02 12:06:05,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-02 12:06:05,773 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.0) internal successors, (64), 31 states have internal predecessors, (64), 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 65 [2021-05-02 12:06:05,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:06:05,774 INFO L225 Difference]: With dead ends: 129 [2021-05-02 12:06:05,774 INFO L226 Difference]: Without dead ends: 124 [2021-05-02 12:06:05,774 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 66 SyntacticMatches, 1 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 382 ImplicationChecksByTransitivity, 1218.2ms TimeCoverageRelationStatistics Valid=229, Invalid=3311, Unknown=0, NotChecked=0, Total=3540 [2021-05-02 12:06:05,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-05-02 12:06:05,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 123. [2021-05-02 12:06:05,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 118 states have (on average 1.0254237288135593) internal successors, (121), 118 states have internal predecessors, (121), 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 12:06:05,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 125 transitions. [2021-05-02 12:06:05,778 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 125 transitions. Word has length 65 [2021-05-02 12:06:05,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:06:05,778 INFO L480 AbstractCegarLoop]: Abstraction has 123 states and 125 transitions. [2021-05-02 12:06:05,779 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 2.0) internal successors, (64), 31 states have internal predecessors, (64), 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 12:06:05,779 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 125 transitions. [2021-05-02 12:06:05,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-02 12:06:05,779 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:06:05,779 INFO L523 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:06:05,979 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable56 [2021-05-02 12:06:05,979 INFO L428 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:06:05,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:06:05,980 INFO L82 PathProgramCache]: Analyzing trace with hash -295137828, now seen corresponding path program 28 times [2021-05-02 12:06:05,980 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:06:05,980 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1402128457] [2021-05-02 12:06:05,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:06:05,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:06:06,584 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:06:06,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:06:06,586 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:06:06,586 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:06:06,586 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1402128457] [2021-05-02 12:06:06,586 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1402128457] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:06:06,586 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1421185782] [2021-05-02 12:06:06,586 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 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:06:06,626 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:06:06,627 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:06:06,627 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 59 conjunts are in the unsatisfiable core [2021-05-02 12:06:06,628 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:06:06,734 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:06:06,740 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:06:06,740 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1421185782] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:06:06,740 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:06:06,740 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31] total 33 [2021-05-02 12:06:06,740 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1701916582] [2021-05-02 12:06:06,740 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-02 12:06:06,740 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:06:06,741 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-02 12:06:06,741 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=964, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 12:06:06,741 INFO L87 Difference]: Start difference. First operand 123 states and 125 transitions. Second operand has 33 states, 33 states have (on average 2.0) internal successors, (66), 32 states have internal predecessors, (66), 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 12:06:08,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:06:08,428 INFO L93 Difference]: Finished difference Result 131 states and 133 transitions. [2021-05-02 12:06:08,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-02 12:06:08,429 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.0) internal successors, (66), 32 states have internal predecessors, (66), 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 67 [2021-05-02 12:06:08,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:06:08,429 INFO L225 Difference]: With dead ends: 131 [2021-05-02 12:06:08,429 INFO L226 Difference]: Without dead ends: 126 [2021-05-02 12:06:08,430 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 68 SyntacticMatches, 1 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 412 ImplicationChecksByTransitivity, 1501.4ms TimeCoverageRelationStatistics Valid=270, Invalid=3636, Unknown=0, NotChecked=0, Total=3906 [2021-05-02 12:06:08,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-05-02 12:06:08,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 125. [2021-05-02 12:06:08,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 120 states have (on average 1.025) internal successors, (123), 120 states have internal predecessors, (123), 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 12:06:08,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 127 transitions. [2021-05-02 12:06:08,434 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 127 transitions. Word has length 67 [2021-05-02 12:06:08,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:06:08,434 INFO L480 AbstractCegarLoop]: Abstraction has 125 states and 127 transitions. [2021-05-02 12:06:08,434 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 2.0) internal successors, (66), 32 states have internal predecessors, (66), 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 12:06:08,434 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 127 transitions. [2021-05-02 12:06:08,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-02 12:06:08,434 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:06:08,434 INFO L523 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:06:08,643 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable57 [2021-05-02 12:06:08,644 INFO L428 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:06:08,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:06:08,644 INFO L82 PathProgramCache]: Analyzing trace with hash 1569840660, now seen corresponding path program 27 times [2021-05-02 12:06:08,644 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:06:08,644 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [769972430] [2021-05-02 12:06:08,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:06:08,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:06:09,182 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:06:09,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:06:09,184 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:06:09,185 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:06:09,185 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [769972430] [2021-05-02 12:06:09,185 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [769972430] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:06:09,185 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [221829232] [2021-05-02 12:06:09,185 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 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:06:09,776 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 29 check-sat command(s) [2021-05-02 12:06:09,776 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:06:09,778 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 74 conjunts are in the unsatisfiable core [2021-05-02 12:06:09,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:06:10,184 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:06:10,189 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:06:10,189 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [221829232] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:06:10,189 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:06:10,190 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31] total 33 [2021-05-02 12:06:10,190 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1303196093] [2021-05-02 12:06:10,190 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-02 12:06:10,190 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:06:10,190 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-02 12:06:10,190 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=964, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 12:06:10,190 INFO L87 Difference]: Start difference. First operand 125 states and 127 transitions. Second operand has 33 states, 33 states have (on average 2.0) internal successors, (66), 32 states have internal predecessors, (66), 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 12:06:11,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:06:11,898 INFO L93 Difference]: Finished difference Result 133 states and 135 transitions. [2021-05-02 12:06:11,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-02 12:06:11,899 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.0) internal successors, (66), 32 states have internal predecessors, (66), 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 67 [2021-05-02 12:06:11,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:06:11,899 INFO L225 Difference]: With dead ends: 133 [2021-05-02 12:06:11,899 INFO L226 Difference]: Without dead ends: 128 [2021-05-02 12:06:11,900 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 53 SyntacticMatches, 16 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 440 ImplicationChecksByTransitivity, 1693.4ms TimeCoverageRelationStatistics Valid=237, Invalid=3545, Unknown=0, NotChecked=0, Total=3782 [2021-05-02 12:06:11,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-05-02 12:06:11,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 127. [2021-05-02 12:06:11,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 122 states have (on average 1.0245901639344261) internal successors, (125), 122 states have internal predecessors, (125), 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 12:06:11,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 129 transitions. [2021-05-02 12:06:11,904 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 129 transitions. Word has length 67 [2021-05-02 12:06:11,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:06:11,904 INFO L480 AbstractCegarLoop]: Abstraction has 127 states and 129 transitions. [2021-05-02 12:06:11,904 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 2.0) internal successors, (66), 32 states have internal predecessors, (66), 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 12:06:11,904 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 129 transitions. [2021-05-02 12:06:11,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-02 12:06:11,905 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:06:11,905 INFO L523 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:06:12,108 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable58,56 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:06:12,108 INFO L428 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:06:12,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:06:12,109 INFO L82 PathProgramCache]: Analyzing trace with hash 939613335, now seen corresponding path program 29 times [2021-05-02 12:06:12,109 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:06:12,109 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1702146736] [2021-05-02 12:06:12,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:06:12,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:06:12,663 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:06:12,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:06:12,666 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:06:12,666 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:06:12,666 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1702146736] [2021-05-02 12:06:12,666 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1702146736] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:06:12,666 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1639967982] [2021-05-02 12:06:12,666 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:06:19,190 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 30 check-sat command(s) [2021-05-02 12:06:19,190 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:06:19,194 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 88 conjunts are in the unsatisfiable core [2021-05-02 12:06:19,195 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:06:19,713 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:06:19,718 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:06:19,718 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1639967982] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:06:19,718 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:06:19,718 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32] total 34 [2021-05-02 12:06:19,718 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [58472750] [2021-05-02 12:06:19,718 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-02 12:06:19,718 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:06:19,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-02 12:06:19,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1027, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 12:06:19,719 INFO L87 Difference]: Start difference. First operand 127 states and 129 transitions. Second operand has 34 states, 34 states have (on average 2.0) internal successors, (68), 33 states have internal predecessors, (68), 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 12:06:21,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:06:21,433 INFO L93 Difference]: Finished difference Result 135 states and 137 transitions. [2021-05-02 12:06:21,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-02 12:06:21,434 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.0) internal successors, (68), 33 states have internal predecessors, (68), 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 69 [2021-05-02 12:06:21,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:06:21,434 INFO L225 Difference]: With dead ends: 135 [2021-05-02 12:06:21,434 INFO L226 Difference]: Without dead ends: 130 [2021-05-02 12:06:21,435 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 43 SyntacticMatches, 28 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 495 ImplicationChecksByTransitivity, 1878.2ms TimeCoverageRelationStatistics Valid=279, Invalid=3881, Unknown=0, NotChecked=0, Total=4160 [2021-05-02 12:06:21,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2021-05-02 12:06:21,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 129. [2021-05-02 12:06:21,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 124 states have (on average 1.0241935483870968) internal successors, (127), 124 states have internal predecessors, (127), 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 12:06:21,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 131 transitions. [2021-05-02 12:06:21,439 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 131 transitions. Word has length 69 [2021-05-02 12:06:21,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:06:21,439 INFO L480 AbstractCegarLoop]: Abstraction has 129 states and 131 transitions. [2021-05-02 12:06:21,439 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 2.0) internal successors, (68), 33 states have internal predecessors, (68), 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 12:06:21,439 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 131 transitions. [2021-05-02 12:06:21,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-02 12:06:21,440 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:06:21,440 INFO L523 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:06:21,644 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2021-05-02 12:06:21,644 INFO L428 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:06:21,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:06:21,645 INFO L82 PathProgramCache]: Analyzing trace with hash 2125319569, now seen corresponding path program 28 times [2021-05-02 12:06:21,645 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:06:21,645 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [27598283] [2021-05-02 12:06:21,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:06:21,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:06:22,154 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:06:22,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:06:22,157 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:06:22,157 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:06:22,157 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [27598283] [2021-05-02 12:06:22,157 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [27598283] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:06:22,157 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1280394953] [2021-05-02 12:06:22,157 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 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:06:22,203 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:06:22,204 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:06:22,205 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 61 conjunts are in the unsatisfiable core [2021-05-02 12:06:22,206 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:06:22,323 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:06:22,353 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:06:22,354 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1280394953] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:06:22,354 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:06:22,354 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32] total 34 [2021-05-02 12:06:22,354 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1446986050] [2021-05-02 12:06:22,354 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-02 12:06:22,354 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:06:22,354 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-02 12:06:22,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1027, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 12:06:22,355 INFO L87 Difference]: Start difference. First operand 129 states and 131 transitions. Second operand has 34 states, 34 states have (on average 2.0) internal successors, (68), 33 states have internal predecessors, (68), 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 12:06:24,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:06:24,290 INFO L93 Difference]: Finished difference Result 137 states and 139 transitions. [2021-05-02 12:06:24,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-02 12:06:24,291 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.0) internal successors, (68), 33 states have internal predecessors, (68), 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 69 [2021-05-02 12:06:24,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:06:24,291 INFO L225 Difference]: With dead ends: 137 [2021-05-02 12:06:24,291 INFO L226 Difference]: Without dead ends: 132 [2021-05-02 12:06:24,292 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 70 SyntacticMatches, 1 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 439 ImplicationChecksByTransitivity, 1441.4ms TimeCoverageRelationStatistics Valid=245, Invalid=3787, Unknown=0, NotChecked=0, Total=4032 [2021-05-02 12:06:24,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-05-02 12:06:24,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 131. [2021-05-02 12:06:24,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 126 states have (on average 1.0238095238095237) internal successors, (129), 126 states have internal predecessors, (129), 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 12:06:24,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 133 transitions. [2021-05-02 12:06:24,296 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 133 transitions. Word has length 69 [2021-05-02 12:06:24,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:06:24,296 INFO L480 AbstractCegarLoop]: Abstraction has 131 states and 133 transitions. [2021-05-02 12:06:24,296 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 2.0) internal successors, (68), 33 states have internal predecessors, (68), 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 12:06:24,296 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 133 transitions. [2021-05-02 12:06:24,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-05-02 12:06:24,297 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:06:24,297 INFO L523 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:06:24,512 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60,58 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:06:24,512 INFO L428 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:06:24,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:06:24,512 INFO L82 PathProgramCache]: Analyzing trace with hash 2124507282, now seen corresponding path program 30 times [2021-05-02 12:06:24,512 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:06:24,512 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1094860358] [2021-05-02 12:06:24,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:06:24,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:06:25,075 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:06:25,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:06:25,078 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:06:25,078 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:06:25,078 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1094860358] [2021-05-02 12:06:25,078 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1094860358] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:06:25,078 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [947215026] [2021-05-02 12:06:25,078 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:06:26,575 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 31 check-sat command(s) [2021-05-02 12:06:26,576 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:06:26,579 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 84 conjunts are in the unsatisfiable core [2021-05-02 12:06:26,580 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:06:27,089 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:06:27,094 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:06:27,094 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [947215026] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:06:27,094 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:06:27,094 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33] total 35 [2021-05-02 12:06:27,094 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [176647260] [2021-05-02 12:06:27,094 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-02 12:06:27,094 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:06:27,094 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-02 12:06:27,095 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 12:06:27,095 INFO L87 Difference]: Start difference. First operand 131 states and 133 transitions. Second operand has 35 states, 35 states have (on average 2.0) internal successors, (70), 34 states have internal predecessors, (70), 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 12:06:28,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:06:28,919 INFO L93 Difference]: Finished difference Result 139 states and 141 transitions. [2021-05-02 12:06:28,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 12:06:28,919 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.0) internal successors, (70), 34 states have internal predecessors, (70), 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 71 [2021-05-02 12:06:28,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:06:28,920 INFO L225 Difference]: With dead ends: 139 [2021-05-02 12:06:28,920 INFO L226 Difference]: Without dead ends: 134 [2021-05-02 12:06:28,920 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 51 SyntacticMatches, 22 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 513 ImplicationChecksByTransitivity, 1942.9ms TimeCoverageRelationStatistics Valid=288, Invalid=4134, Unknown=0, NotChecked=0, Total=4422 [2021-05-02 12:06:28,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2021-05-02 12:06:28,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 133. [2021-05-02 12:06:28,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 128 states have (on average 1.0234375) internal successors, (131), 128 states have internal predecessors, (131), 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 12:06:28,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 135 transitions. [2021-05-02 12:06:28,925 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 135 transitions. Word has length 71 [2021-05-02 12:06:28,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:06:28,925 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 135 transitions. [2021-05-02 12:06:28,925 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 2.0) internal successors, (70), 34 states have internal predecessors, (70), 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 12:06:28,925 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 135 transitions. [2021-05-02 12:06:28,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-05-02 12:06:28,925 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:06:28,925 INFO L523 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:06:29,128 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable61 [2021-05-02 12:06:29,129 INFO L428 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:06:29,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:06:29,129 INFO L82 PathProgramCache]: Analyzing trace with hash -930360882, now seen corresponding path program 29 times [2021-05-02 12:06:29,129 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:06:29,129 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [417366315] [2021-05-02 12:06:29,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:06:29,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:06:29,682 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:06:29,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:06:29,684 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:06:29,685 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:06:29,685 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [417366315] [2021-05-02 12:06:29,685 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [417366315] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:06:29,685 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [53119943] [2021-05-02 12:06:29,685 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:06:36,545 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 31 check-sat command(s) [2021-05-02 12:06:36,545 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:06:36,551 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 93 conjunts are in the unsatisfiable core [2021-05-02 12:06:36,552 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:06:37,116 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:06:37,121 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:06:37,121 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [53119943] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:06:37,121 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:06:37,121 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33] total 35 [2021-05-02 12:06:37,121 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1040417571] [2021-05-02 12:06:37,121 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-02 12:06:37,121 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:06:37,121 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-02 12:06:37,121 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 12:06:37,122 INFO L87 Difference]: Start difference. First operand 133 states and 135 transitions. Second operand has 35 states, 35 states have (on average 2.0) internal successors, (70), 34 states have internal predecessors, (70), 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 12:06:38,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:06:38,906 INFO L93 Difference]: Finished difference Result 141 states and 143 transitions. [2021-05-02 12:06:38,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-02 12:06:38,906 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.0) internal successors, (70), 34 states have internal predecessors, (70), 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 71 [2021-05-02 12:06:38,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:06:38,907 INFO L225 Difference]: With dead ends: 141 [2021-05-02 12:06:38,907 INFO L226 Difference]: Without dead ends: 136 [2021-05-02 12:06:38,907 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 42 SyntacticMatches, 31 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 528 ImplicationChecksByTransitivity, 1856.8ms TimeCoverageRelationStatistics Valid=253, Invalid=4037, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 12:06:38,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2021-05-02 12:06:38,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 135. [2021-05-02 12:06:38,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 130 states have (on average 1.023076923076923) internal successors, (133), 130 states have internal predecessors, (133), 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 12:06:38,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 137 transitions. [2021-05-02 12:06:38,913 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 137 transitions. Word has length 71 [2021-05-02 12:06:38,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:06:38,913 INFO L480 AbstractCegarLoop]: Abstraction has 135 states and 137 transitions. [2021-05-02 12:06:38,913 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 2.0) internal successors, (70), 34 states have internal predecessors, (70), 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 12:06:38,913 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 137 transitions. [2021-05-02 12:06:38,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-02 12:06:38,914 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:06:38,914 INFO L523 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:06:39,118 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62,60 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:06:39,119 INFO L428 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:06:39,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:06:39,119 INFO L82 PathProgramCache]: Analyzing trace with hash -1653710387, now seen corresponding path program 31 times [2021-05-02 12:06:39,119 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:06:39,119 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1917800150] [2021-05-02 12:06:39,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:06:39,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:06:39,725 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:06:39,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:06:39,727 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:06:39,728 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:06:39,728 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1917800150] [2021-05-02 12:06:39,728 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1917800150] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:06:39,728 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [478557568] [2021-05-02 12:06:39,728 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:06:39,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:06:39,768 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 65 conjunts are in the unsatisfiable core [2021-05-02 12:06:39,769 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:06:39,881 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:06:39,886 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:06:39,886 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [478557568] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:06:39,886 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:06:39,886 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34] total 36 [2021-05-02 12:06:39,886 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [57049915] [2021-05-02 12:06:39,887 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-02 12:06:39,887 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:06:39,887 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-02 12:06:39,887 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1159, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 12:06:39,887 INFO L87 Difference]: Start difference. First operand 135 states and 137 transitions. Second operand has 36 states, 36 states have (on average 2.0) internal successors, (72), 35 states have internal predecessors, (72), 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 12:06:41,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:06:41,828 INFO L93 Difference]: Finished difference Result 143 states and 145 transitions. [2021-05-02 12:06:41,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-02 12:06:41,829 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.0) internal successors, (72), 35 states have internal predecessors, (72), 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 73 [2021-05-02 12:06:41,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:06:41,829 INFO L225 Difference]: With dead ends: 143 [2021-05-02 12:06:41,830 INFO L226 Difference]: Without dead ends: 138 [2021-05-02 12:06:41,830 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 74 SyntacticMatches, 1 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 502 ImplicationChecksByTransitivity, 1632.3ms TimeCoverageRelationStatistics Valid=297, Invalid=4395, Unknown=0, NotChecked=0, Total=4692 [2021-05-02 12:06:41,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2021-05-02 12:06:41,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 137. [2021-05-02 12:06:41,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 132 states have (on average 1.0227272727272727) internal successors, (135), 132 states have internal predecessors, (135), 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 12:06:41,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 139 transitions. [2021-05-02 12:06:41,834 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 139 transitions. Word has length 73 [2021-05-02 12:06:41,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:06:41,835 INFO L480 AbstractCegarLoop]: Abstraction has 137 states and 139 transitions. [2021-05-02 12:06:41,835 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 2.0) internal successors, (72), 35 states have internal predecessors, (72), 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 12:06:41,835 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 139 transitions. [2021-05-02 12:06:41,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-02 12:06:41,835 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:06:41,835 INFO L523 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:06:42,045 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable63 [2021-05-02 12:06:42,045 INFO L428 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:06:42,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:06:42,045 INFO L82 PathProgramCache]: Analyzing trace with hash 318356171, now seen corresponding path program 30 times [2021-05-02 12:06:42,045 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:06:42,045 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [398867504] [2021-05-02 12:06:42,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:06:42,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:06:42,625 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:06:42,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:06:42,628 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:06:42,628 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:06:42,628 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [398867504] [2021-05-02 12:06:42,628 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [398867504] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:06:42,628 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1906697383] [2021-05-02 12:06:42,628 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:06:43,724 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 32 check-sat command(s) [2021-05-02 12:06:43,725 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:06:43,727 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 80 conjunts are in the unsatisfiable core [2021-05-02 12:06:43,728 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:06:44,152 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:06:44,157 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:06:44,157 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1906697383] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:06:44,157 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:06:44,157 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34] total 36 [2021-05-02 12:06:44,158 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [708504102] [2021-05-02 12:06:44,158 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-02 12:06:44,158 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:06:44,158 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-02 12:06:44,158 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1159, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 12:06:44,158 INFO L87 Difference]: Start difference. First operand 137 states and 139 transitions. Second operand has 36 states, 36 states have (on average 2.0) internal successors, (72), 35 states have internal predecessors, (72), 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 12:06:46,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:06:46,249 INFO L93 Difference]: Finished difference Result 145 states and 147 transitions. [2021-05-02 12:06:46,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 12:06:46,249 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.0) internal successors, (72), 35 states have internal predecessors, (72), 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 73 [2021-05-02 12:06:46,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:06:46,250 INFO L225 Difference]: With dead ends: 145 [2021-05-02 12:06:46,250 INFO L226 Difference]: Without dead ends: 140 [2021-05-02 12:06:46,250 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 59 SyntacticMatches, 16 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 530 ImplicationChecksByTransitivity, 1884.9ms TimeCoverageRelationStatistics Valid=261, Invalid=4295, Unknown=0, NotChecked=0, Total=4556 [2021-05-02 12:06:46,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-05-02 12:06:46,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 139. [2021-05-02 12:06:46,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 134 states have (on average 1.0223880597014925) internal successors, (137), 134 states have internal predecessors, (137), 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 12:06:46,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 141 transitions. [2021-05-02 12:06:46,255 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 141 transitions. Word has length 73 [2021-05-02 12:06:46,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:06:46,255 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 141 transitions. [2021-05-02 12:06:46,255 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 2.0) internal successors, (72), 35 states have internal predecessors, (72), 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 12:06:46,255 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 141 transitions. [2021-05-02 12:06:46,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-05-02 12:06:46,255 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:06:46,255 INFO L523 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:06:46,459 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64,62 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:06:46,459 INFO L428 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:06:46,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:06:46,459 INFO L82 PathProgramCache]: Analyzing trace with hash 1021442120, now seen corresponding path program 32 times [2021-05-02 12:06:46,459 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:06:46,459 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1938204678] [2021-05-02 12:06:46,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:06:46,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:06:47,081 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:06:47,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:06:47,083 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:06:47,084 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:06:47,084 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1938204678] [2021-05-02 12:06:47,084 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1938204678] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:06:47,084 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1148900970] [2021-05-02 12:06:47,084 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 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:06:47,138 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:06:47,138 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:06:47,139 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 67 conjunts are in the unsatisfiable core [2021-05-02 12:06:47,140 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:06:47,257 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:06:47,262 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:06:47,262 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1148900970] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:06:47,262 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:06:47,262 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35] total 37 [2021-05-02 12:06:47,262 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [811583484] [2021-05-02 12:06:47,263 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-02 12:06:47,263 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:06:47,263 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-02 12:06:47,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1228, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 12:06:47,263 INFO L87 Difference]: Start difference. First operand 139 states and 141 transitions. Second operand has 37 states, 37 states have (on average 2.0) internal successors, (74), 36 states have internal predecessors, (74), 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 12:06:49,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:06:49,270 INFO L93 Difference]: Finished difference Result 147 states and 149 transitions. [2021-05-02 12:06:49,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-02 12:06:49,271 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.0) internal successors, (74), 36 states have internal predecessors, (74), 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 75 [2021-05-02 12:06:49,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:06:49,271 INFO L225 Difference]: With dead ends: 147 [2021-05-02 12:06:49,271 INFO L226 Difference]: Without dead ends: 142 [2021-05-02 12:06:49,272 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 76 SyntacticMatches, 1 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 534 ImplicationChecksByTransitivity, 1695.1ms TimeCoverageRelationStatistics Valid=306, Invalid=4664, Unknown=0, NotChecked=0, Total=4970 [2021-05-02 12:06:49,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2021-05-02 12:06:49,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 141. [2021-05-02 12:06:49,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 136 states have (on average 1.0220588235294117) internal successors, (139), 136 states have internal predecessors, (139), 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 12:06:49,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 143 transitions. [2021-05-02 12:06:49,276 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 143 transitions. Word has length 75 [2021-05-02 12:06:49,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:06:49,277 INFO L480 AbstractCegarLoop]: Abstraction has 141 states and 143 transitions. [2021-05-02 12:06:49,277 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 2.0) internal successors, (74), 36 states have internal predecessors, (74), 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 12:06:49,277 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 143 transitions. [2021-05-02 12:06:49,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-05-02 12:06:49,277 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:06:49,277 INFO L523 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:06:49,489 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable65 [2021-05-02 12:06:49,489 INFO L428 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:06:49,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:06:49,490 INFO L82 PathProgramCache]: Analyzing trace with hash 2039568520, now seen corresponding path program 31 times [2021-05-02 12:06:49,490 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:06:49,490 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [491360569] [2021-05-02 12:06:49,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:06:49,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:06:50,142 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:06:50,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:06:50,145 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:06:50,145 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:06:50,145 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [491360569] [2021-05-02 12:06:50,145 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [491360569] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:06:50,145 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1344206522] [2021-05-02 12:06:50,145 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:06:50,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:06:50,188 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 67 conjunts are in the unsatisfiable core [2021-05-02 12:06:50,189 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:06:50,305 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:06:50,310 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:06:50,310 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1344206522] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:06:50,310 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:06:50,310 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35] total 37 [2021-05-02 12:06:50,310 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [531159776] [2021-05-02 12:06:50,310 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-02 12:06:50,310 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:06:50,311 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-02 12:06:50,311 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1228, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 12:06:50,311 INFO L87 Difference]: Start difference. First operand 141 states and 143 transitions. Second operand has 37 states, 37 states have (on average 2.0) internal successors, (74), 36 states have internal predecessors, (74), 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 12:06:52,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:06:52,540 INFO L93 Difference]: Finished difference Result 149 states and 151 transitions. [2021-05-02 12:06:52,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-02 12:06:52,540 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.0) internal successors, (74), 36 states have internal predecessors, (74), 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 75 [2021-05-02 12:06:52,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:06:52,541 INFO L225 Difference]: With dead ends: 149 [2021-05-02 12:06:52,541 INFO L226 Difference]: Without dead ends: 144 [2021-05-02 12:06:52,541 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 76 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 532 ImplicationChecksByTransitivity, 1679.3ms TimeCoverageRelationStatistics Valid=269, Invalid=4561, Unknown=0, NotChecked=0, Total=4830 [2021-05-02 12:06:52,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2021-05-02 12:06:52,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 143. [2021-05-02 12:06:52,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 138 states have (on average 1.0217391304347827) internal successors, (141), 138 states have internal predecessors, (141), 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 12:06:52,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 145 transitions. [2021-05-02 12:06:52,546 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 145 transitions. Word has length 75 [2021-05-02 12:06:52,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:06:52,546 INFO L480 AbstractCegarLoop]: Abstraction has 143 states and 145 transitions. [2021-05-02 12:06:52,546 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 2.0) internal successors, (74), 36 states have internal predecessors, (74), 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 12:06:52,546 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 145 transitions. [2021-05-02 12:06:52,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-02 12:06:52,547 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:06:52,547 INFO L523 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:06:52,756 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable66,64 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:06:52,757 INFO L428 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:06:52,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:06:52,757 INFO L82 PathProgramCache]: Analyzing trace with hash -842408957, now seen corresponding path program 33 times [2021-05-02 12:06:52,757 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:06:52,757 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1888453625] [2021-05-02 12:06:52,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:06:52,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:06:53,403 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:06:53,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:06:53,406 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:06:53,406 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:06:53,406 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1888453625] [2021-05-02 12:06:53,406 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1888453625] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:06:53,406 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [592131381] [2021-05-02 12:06:53,406 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 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:06:54,128 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 34 check-sat command(s) [2021-05-02 12:06:54,129 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:06:54,131 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 70 conjunts are in the unsatisfiable core [2021-05-02 12:06:54,132 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:06:54,286 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:06:54,292 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:06:54,292 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [592131381] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:06:54,292 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:06:54,292 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36] total 38 [2021-05-02 12:06:54,292 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1728057646] [2021-05-02 12:06:54,292 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-02 12:06:54,292 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:06:54,292 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-02 12:06:54,292 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1299, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 12:06:54,293 INFO L87 Difference]: Start difference. First operand 143 states and 145 transitions. Second operand has 38 states, 38 states have (on average 2.0) internal successors, (76), 37 states have internal predecessors, (76), 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 12:06:56,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:06:56,431 INFO L93 Difference]: Finished difference Result 151 states and 153 transitions. [2021-05-02 12:06:56,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-02 12:06:56,432 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.0) internal successors, (76), 37 states have internal predecessors, (76), 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 77 [2021-05-02 12:06:56,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:06:56,432 INFO L225 Difference]: With dead ends: 151 [2021-05-02 12:06:56,432 INFO L226 Difference]: Without dead ends: 146 [2021-05-02 12:06:56,433 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 77 SyntacticMatches, 2 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 569 ImplicationChecksByTransitivity, 1809.4ms TimeCoverageRelationStatistics Valid=315, Invalid=4941, Unknown=0, NotChecked=0, Total=5256 [2021-05-02 12:06:56,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2021-05-02 12:06:56,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 145. [2021-05-02 12:06:56,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 145 states, 140 states have (on average 1.0214285714285714) internal successors, (143), 140 states have internal predecessors, (143), 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 12:06:56,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 147 transitions. [2021-05-02 12:06:56,437 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 147 transitions. Word has length 77 [2021-05-02 12:06:56,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:06:56,437 INFO L480 AbstractCegarLoop]: Abstraction has 145 states and 147 transitions. [2021-05-02 12:06:56,437 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 2.0) internal successors, (76), 37 states have internal predecessors, (76), 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 12:06:56,437 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 147 transitions. [2021-05-02 12:06:56,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-02 12:06:56,438 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:06:56,438 INFO L523 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:06:56,642 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 65 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable67 [2021-05-02 12:06:56,643 INFO L428 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:06:56,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:06:56,643 INFO L82 PathProgramCache]: Analyzing trace with hash -1732740347, now seen corresponding path program 32 times [2021-05-02 12:06:56,643 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:06:56,643 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [106966666] [2021-05-02 12:06:56,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:06:56,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:06:57,278 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:06:57,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:06:57,280 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:06:57,280 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:06:57,280 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [106966666] [2021-05-02 12:06:57,280 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [106966666] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:06:57,280 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [627034513] [2021-05-02 12:06:57,280 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 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:06:57,341 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:06:57,341 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:06:57,342 INFO L263 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 69 conjunts are in the unsatisfiable core [2021-05-02 12:06:57,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:06:57,465 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:06:57,470 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:06:57,470 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [627034513] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:06:57,470 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:06:57,470 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36] total 38 [2021-05-02 12:06:57,470 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1383872921] [2021-05-02 12:06:57,470 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-02 12:06:57,470 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:06:57,470 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-02 12:06:57,470 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1299, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 12:06:57,470 INFO L87 Difference]: Start difference. First operand 145 states and 147 transitions. Second operand has 38 states, 38 states have (on average 2.0) internal successors, (76), 37 states have internal predecessors, (76), 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 12:06:59,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:06:59,805 INFO L93 Difference]: Finished difference Result 153 states and 155 transitions. [2021-05-02 12:06:59,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-02 12:06:59,806 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.0) internal successors, (76), 37 states have internal predecessors, (76), 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 77 [2021-05-02 12:06:59,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:06:59,806 INFO L225 Difference]: With dead ends: 153 [2021-05-02 12:06:59,806 INFO L226 Difference]: Without dead ends: 148 [2021-05-02 12:06:59,807 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 78 SyntacticMatches, 1 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 565 ImplicationChecksByTransitivity, 1748.4ms TimeCoverageRelationStatistics Valid=277, Invalid=4835, Unknown=0, NotChecked=0, Total=5112 [2021-05-02 12:06:59,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-05-02 12:06:59,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 147. [2021-05-02 12:06:59,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 142 states have (on average 1.0211267605633803) internal successors, (145), 142 states have internal predecessors, (145), 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 12:06:59,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 149 transitions. [2021-05-02 12:06:59,812 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 149 transitions. Word has length 77 [2021-05-02 12:06:59,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:06:59,812 INFO L480 AbstractCegarLoop]: Abstraction has 147 states and 149 transitions. [2021-05-02 12:06:59,812 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 2.0) internal successors, (76), 37 states have internal predecessors, (76), 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 12:06:59,812 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 149 transitions. [2021-05-02 12:06:59,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-02 12:06:59,812 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:06:59,812 INFO L523 BasicCegarLoop]: trace histogram [34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:07:00,020 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable68 [2021-05-02 12:07:00,021 INFO L428 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:07:00,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:07:00,021 INFO L82 PathProgramCache]: Analyzing trace with hash -1001931522, now seen corresponding path program 34 times [2021-05-02 12:07:00,021 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:07:00,021 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [76506845] [2021-05-02 12:07:00,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:07:00,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:07:00,702 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:07:00,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:07:00,708 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:07:00,708 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:07:00,708 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [76506845] [2021-05-02 12:07:00,708 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [76506845] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:07:00,708 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [784673650] [2021-05-02 12:07:00,708 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 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:07:00,754 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:07:00,755 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:07:00,756 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 71 conjunts are in the unsatisfiable core [2021-05-02 12:07:00,756 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:07:00,889 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:07:00,894 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:07:00,894 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [784673650] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:07:00,894 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:07:00,894 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 37] total 39 [2021-05-02 12:07:00,894 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [268916826] [2021-05-02 12:07:00,894 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-02 12:07:00,894 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:07:00,894 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-02 12:07:00,895 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1372, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 12:07:00,895 INFO L87 Difference]: Start difference. First operand 147 states and 149 transitions. Second operand has 39 states, 39 states have (on average 2.0) internal successors, (78), 38 states have internal predecessors, (78), 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 12:07:03,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:07:03,201 INFO L93 Difference]: Finished difference Result 155 states and 157 transitions. [2021-05-02 12:07:03,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-02 12:07:03,201 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.0) internal successors, (78), 38 states have internal predecessors, (78), 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 79 [2021-05-02 12:07:03,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:07:03,202 INFO L225 Difference]: With dead ends: 155 [2021-05-02 12:07:03,202 INFO L226 Difference]: Without dead ends: 150 [2021-05-02 12:07:03,202 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 80 SyntacticMatches, 1 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 601 ImplicationChecksByTransitivity, 1918.1ms TimeCoverageRelationStatistics Valid=324, Invalid=5226, Unknown=0, NotChecked=0, Total=5550 [2021-05-02 12:07:03,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2021-05-02 12:07:03,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 149. [2021-05-02 12:07:03,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 144 states have (on average 1.0208333333333333) internal successors, (147), 144 states have internal predecessors, (147), 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 12:07:03,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 151 transitions. [2021-05-02 12:07:03,207 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 151 transitions. Word has length 79 [2021-05-02 12:07:03,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:07:03,207 INFO L480 AbstractCegarLoop]: Abstraction has 149 states and 151 transitions. [2021-05-02 12:07:03,207 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 2.0) internal successors, (78), 38 states have internal predecessors, (78), 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 12:07:03,207 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 151 transitions. [2021-05-02 12:07:03,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-02 12:07:03,208 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:07:03,208 INFO L523 BasicCegarLoop]: trace histogram [34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:07:03,422 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable69 [2021-05-02 12:07:03,422 INFO L428 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:07:03,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:07:03,422 INFO L82 PathProgramCache]: Analyzing trace with hash -1969163710, now seen corresponding path program 33 times [2021-05-02 12:07:03,422 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:07:03,422 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [17420327] [2021-05-02 12:07:03,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:07:03,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:07:04,128 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:07:04,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:07:04,131 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:07:04,131 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:07:04,131 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [17420327] [2021-05-02 12:07:04,131 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [17420327] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:07:04,131 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [123481165] [2021-05-02 12:07:04,131 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 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:07:05,342 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 35 check-sat command(s) [2021-05-02 12:07:05,342 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:07:05,345 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 92 conjunts are in the unsatisfiable core [2021-05-02 12:07:05,346 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:07:05,881 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:07:05,881 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [123481165] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:07:05,881 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:07:05,881 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 37] total 39 [2021-05-02 12:07:05,882 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1537632493] [2021-05-02 12:07:05,882 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-02 12:07:05,882 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:07:05,882 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-02 12:07:05,882 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1372, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 12:07:05,882 INFO L87 Difference]: Start difference. First operand 149 states and 151 transitions. Second operand has 39 states, 39 states have (on average 2.0) internal successors, (78), 38 states have internal predecessors, (78), 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 12:07:08,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:07:08,270 INFO L93 Difference]: Finished difference Result 157 states and 159 transitions. [2021-05-02 12:07:08,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-02 12:07:08,270 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.0) internal successors, (78), 38 states have internal predecessors, (78), 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 79 [2021-05-02 12:07:08,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:07:08,271 INFO L225 Difference]: With dead ends: 157 [2021-05-02 12:07:08,271 INFO L226 Difference]: Without dead ends: 152 [2021-05-02 12:07:08,271 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 65 SyntacticMatches, 16 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 652 ImplicationChecksByTransitivity, 2225.4ms TimeCoverageRelationStatistics Valid=324, Invalid=5226, Unknown=0, NotChecked=0, Total=5550 [2021-05-02 12:07:08,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2021-05-02 12:07:08,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 151. [2021-05-02 12:07:08,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 146 states have (on average 1.0205479452054795) internal successors, (149), 146 states have internal predecessors, (149), 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 12:07:08,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 153 transitions. [2021-05-02 12:07:08,289 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 153 transitions. Word has length 79 [2021-05-02 12:07:08,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:07:08,289 INFO L480 AbstractCegarLoop]: Abstraction has 151 states and 153 transitions. [2021-05-02 12:07:08,289 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 2.0) internal successors, (78), 38 states have internal predecessors, (78), 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 12:07:08,290 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 153 transitions. [2021-05-02 12:07:08,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-05-02 12:07:08,290 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:07:08,290 INFO L523 BasicCegarLoop]: trace histogram [35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:07:08,507 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70,68 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:07:08,507 INFO L428 AbstractCegarLoop]: === Iteration 72 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:07:08,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:07:08,508 INFO L82 PathProgramCache]: Analyzing trace with hash 315706169, now seen corresponding path program 35 times [2021-05-02 12:07:08,508 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:07:08,508 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [569283904] [2021-05-02 12:07:08,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:07:08,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:07:09,234 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:07:09,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:07:09,236 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:07:09,236 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:07:09,236 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [569283904] [2021-05-02 12:07:09,236 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [569283904] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:07:09,236 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [801210119] [2021-05-02 12:07:09,236 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:07:17,930 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 36 check-sat command(s) [2021-05-02 12:07:17,931 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:07:17,937 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 108 conjunts are in the unsatisfiable core [2021-05-02 12:07:17,938 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:07:18,697 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:07:18,703 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:07:18,703 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [801210119] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:07:18,703 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:07:18,703 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38] total 40 [2021-05-02 12:07:18,703 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [741501875] [2021-05-02 12:07:18,703 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-02 12:07:18,703 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:07:18,703 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-02 12:07:18,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1447, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 12:07:18,704 INFO L87 Difference]: Start difference. First operand 151 states and 153 transitions. Second operand has 40 states, 40 states have (on average 2.0) internal successors, (80), 39 states have internal predecessors, (80), 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 12:07:21,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:07:21,030 INFO L93 Difference]: Finished difference Result 159 states and 161 transitions. [2021-05-02 12:07:21,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-02 12:07:21,030 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.0) internal successors, (80), 39 states have internal predecessors, (80), 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 81 [2021-05-02 12:07:21,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:07:21,031 INFO L225 Difference]: With dead ends: 159 [2021-05-02 12:07:21,031 INFO L226 Difference]: Without dead ends: 154 [2021-05-02 12:07:21,031 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 47 SyntacticMatches, 36 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 705 ImplicationChecksByTransitivity, 2557.9ms TimeCoverageRelationStatistics Valid=333, Invalid=5519, Unknown=0, NotChecked=0, Total=5852 [2021-05-02 12:07:21,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2021-05-02 12:07:21,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 153. [2021-05-02 12:07:21,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 148 states have (on average 1.0202702702702702) internal successors, (151), 148 states have internal predecessors, (151), 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 12:07:21,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 155 transitions. [2021-05-02 12:07:21,046 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 155 transitions. Word has length 81 [2021-05-02 12:07:21,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:07:21,046 INFO L480 AbstractCegarLoop]: Abstraction has 153 states and 155 transitions. [2021-05-02 12:07:21,046 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 40 states have (on average 2.0) internal successors, (80), 39 states have internal predecessors, (80), 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 12:07:21,046 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 155 transitions. [2021-05-02 12:07:21,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-05-02 12:07:21,047 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:07:21,047 INFO L523 BasicCegarLoop]: trace histogram [35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:07:21,250 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71,69 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:07:21,250 INFO L428 AbstractCegarLoop]: === Iteration 73 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:07:21,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:07:21,250 INFO L82 PathProgramCache]: Analyzing trace with hash -1538748865, now seen corresponding path program 34 times [2021-05-02 12:07:21,250 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:07:21,250 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1282279528] [2021-05-02 12:07:21,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:07:21,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:07:21,976 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:07:21,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:07:21,978 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:07:21,978 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:07:21,978 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1282279528] [2021-05-02 12:07:21,979 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1282279528] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:07:21,979 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [213880830] [2021-05-02 12:07:21,979 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 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:07:22,024 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:07:22,024 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:07:22,025 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 73 conjunts are in the unsatisfiable core [2021-05-02 12:07:22,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:07:22,156 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:07:22,161 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:07:22,161 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [213880830] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:07:22,161 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:07:22,161 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38] total 40 [2021-05-02 12:07:22,161 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [291120300] [2021-05-02 12:07:22,161 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-02 12:07:22,162 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:07:22,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-02 12:07:22,162 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1447, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 12:07:22,162 INFO L87 Difference]: Start difference. First operand 153 states and 155 transitions. Second operand has 40 states, 40 states have (on average 2.0) internal successors, (80), 39 states have internal predecessors, (80), 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 12:07:24,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:07:24,739 INFO L93 Difference]: Finished difference Result 161 states and 163 transitions. [2021-05-02 12:07:24,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-02 12:07:24,739 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.0) internal successors, (80), 39 states have internal predecessors, (80), 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 81 [2021-05-02 12:07:24,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:07:24,740 INFO L225 Difference]: With dead ends: 161 [2021-05-02 12:07:24,740 INFO L226 Difference]: Without dead ends: 156 [2021-05-02 12:07:24,740 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 82 SyntacticMatches, 1 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 634 ImplicationChecksByTransitivity, 1936.0ms TimeCoverageRelationStatistics Valid=293, Invalid=5407, Unknown=0, NotChecked=0, Total=5700 [2021-05-02 12:07:24,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2021-05-02 12:07:24,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 155. [2021-05-02 12:07:24,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 150 states have (on average 1.02) internal successors, (153), 150 states have internal predecessors, (153), 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 12:07:24,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 157 transitions. [2021-05-02 12:07:24,745 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 157 transitions. Word has length 81 [2021-05-02 12:07:24,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:07:24,745 INFO L480 AbstractCegarLoop]: Abstraction has 155 states and 157 transitions. [2021-05-02 12:07:24,745 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 40 states have (on average 2.0) internal successors, (80), 39 states have internal predecessors, (80), 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 12:07:24,746 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 157 transitions. [2021-05-02 12:07:24,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-02 12:07:24,746 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:07:24,746 INFO L523 BasicCegarLoop]: trace histogram [36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:07:24,961 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72,70 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:07:24,961 INFO L428 AbstractCegarLoop]: === Iteration 74 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:07:24,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:07:24,961 INFO L82 PathProgramCache]: Analyzing trace with hash -449825100, now seen corresponding path program 36 times [2021-05-02 12:07:24,961 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:07:24,962 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1804285819] [2021-05-02 12:07:24,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:07:24,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:07:25,727 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:07:25,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:07:25,729 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:07:25,729 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:07:25,729 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1804285819] [2021-05-02 12:07:25,729 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1804285819] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:07:25,729 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2411957] [2021-05-02 12:07:25,729 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:07:27,493 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 37 check-sat command(s) [2021-05-02 12:07:27,493 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:07:27,497 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 94 conjunts are in the unsatisfiable core [2021-05-02 12:07:27,498 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:07:28,084 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:07:28,089 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:07:28,089 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2411957] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:07:28,089 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:07:28,089 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 39] total 41 [2021-05-02 12:07:28,089 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1926756715] [2021-05-02 12:07:28,089 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-02 12:07:28,089 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:07:28,090 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-02 12:07:28,090 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1524, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 12:07:28,090 INFO L87 Difference]: Start difference. First operand 155 states and 157 transitions. Second operand has 41 states, 41 states have (on average 2.0) internal successors, (82), 40 states have internal predecessors, (82), 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 12:07:30,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:07:30,327 INFO L93 Difference]: Finished difference Result 163 states and 165 transitions. [2021-05-02 12:07:30,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-02 12:07:30,328 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.0) internal successors, (82), 40 states have internal predecessors, (82), 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 83 [2021-05-02 12:07:30,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:07:30,328 INFO L225 Difference]: With dead ends: 163 [2021-05-02 12:07:30,328 INFO L226 Difference]: Without dead ends: 158 [2021-05-02 12:07:30,330 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 65 SyntacticMatches, 20 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 710 ImplicationChecksByTransitivity, 2387.7ms TimeCoverageRelationStatistics Valid=342, Invalid=5820, Unknown=0, NotChecked=0, Total=6162 [2021-05-02 12:07:30,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2021-05-02 12:07:30,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 157. [2021-05-02 12:07:30,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 157 states, 152 states have (on average 1.019736842105263) internal successors, (155), 152 states have internal predecessors, (155), 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 12:07:30,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 159 transitions. [2021-05-02 12:07:30,335 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 159 transitions. Word has length 83 [2021-05-02 12:07:30,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:07:30,336 INFO L480 AbstractCegarLoop]: Abstraction has 157 states and 159 transitions. [2021-05-02 12:07:30,336 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 2.0) internal successors, (82), 40 states have internal predecessors, (82), 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 12:07:30,336 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 159 transitions. [2021-05-02 12:07:30,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-02 12:07:30,337 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:07:30,337 INFO L523 BasicCegarLoop]: trace histogram [36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:07:30,540 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 71 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable73 [2021-05-02 12:07:30,540 INFO L428 AbstractCegarLoop]: === Iteration 75 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:07:30,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:07:30,541 INFO L82 PathProgramCache]: Analyzing trace with hash -226943236, now seen corresponding path program 35 times [2021-05-02 12:07:30,541 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:07:30,541 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [643521481] [2021-05-02 12:07:30,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:07:30,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:07:31,294 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:07:31,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:07:31,297 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:07:31,297 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:07:31,297 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [643521481] [2021-05-02 12:07:31,297 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [643521481] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:07:31,297 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1962393951] [2021-05-02 12:07:31,297 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:07:45,251 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 37 check-sat command(s) [2021-05-02 12:07:45,252 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:07:45,257 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 106 conjunts are in the unsatisfiable core [2021-05-02 12:07:45,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:07:45,986 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:07:45,991 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:07:45,991 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1962393951] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:07:45,991 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:07:45,991 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 39] total 41 [2021-05-02 12:07:45,991 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1493569794] [2021-05-02 12:07:45,992 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-02 12:07:45,992 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:07:45,992 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-02 12:07:45,992 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1524, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 12:07:45,992 INFO L87 Difference]: Start difference. First operand 157 states and 159 transitions. Second operand has 41 states, 41 states have (on average 2.0) internal successors, (82), 40 states have internal predecessors, (82), 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 12:07:48,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:07:48,715 INFO L93 Difference]: Finished difference Result 165 states and 167 transitions. [2021-05-02 12:07:48,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-02 12:07:48,715 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.0) internal successors, (82), 40 states have internal predecessors, (82), 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 83 [2021-05-02 12:07:48,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:07:48,716 INFO L225 Difference]: With dead ends: 165 [2021-05-02 12:07:48,716 INFO L226 Difference]: Without dead ends: 160 [2021-05-02 12:07:48,716 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 53 SyntacticMatches, 32 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 732 ImplicationChecksByTransitivity, 2584.0ms TimeCoverageRelationStatistics Valid=301, Invalid=5705, Unknown=0, NotChecked=0, Total=6006 [2021-05-02 12:07:48,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2021-05-02 12:07:48,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 159. [2021-05-02 12:07:48,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 159 states, 154 states have (on average 1.0194805194805194) internal successors, (157), 154 states have internal predecessors, (157), 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 12:07:48,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 161 transitions. [2021-05-02 12:07:48,721 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 161 transitions. Word has length 83 [2021-05-02 12:07:48,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:07:48,721 INFO L480 AbstractCegarLoop]: Abstraction has 159 states and 161 transitions. [2021-05-02 12:07:48,721 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 2.0) internal successors, (82), 40 states have internal predecessors, (82), 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 12:07:48,721 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 161 transitions. [2021-05-02 12:07:48,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-02 12:07:48,722 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:07:48,722 INFO L523 BasicCegarLoop]: trace histogram [37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:07:48,922 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable74,72 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:07:48,922 INFO L428 AbstractCegarLoop]: === Iteration 76 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:07:48,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:07:48,923 INFO L82 PathProgramCache]: Analyzing trace with hash -1685966993, now seen corresponding path program 37 times [2021-05-02 12:07:48,923 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:07:48,923 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [27973093] [2021-05-02 12:07:48,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:07:48,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:07:49,704 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:07:49,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:07:49,707 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:07:49,707 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:07:49,707 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [27973093] [2021-05-02 12:07:49,707 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [27973093] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:07:49,707 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [400688310] [2021-05-02 12:07:49,707 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 73 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 73 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:07:49,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:07:49,778 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 77 conjunts are in the unsatisfiable core [2021-05-02 12:07:49,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:07:49,917 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:07:49,922 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:07:49,922 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [400688310] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:07:49,922 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:07:49,922 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 40] total 42 [2021-05-02 12:07:49,922 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1098516554] [2021-05-02 12:07:49,923 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-02 12:07:49,923 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:07:49,923 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-02 12:07:49,923 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=1603, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 12:07:49,923 INFO L87 Difference]: Start difference. First operand 159 states and 161 transitions. Second operand has 42 states, 42 states have (on average 2.0) internal successors, (84), 41 states have internal predecessors, (84), 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 12:07:52,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:07:52,571 INFO L93 Difference]: Finished difference Result 167 states and 169 transitions. [2021-05-02 12:07:52,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-02 12:07:52,571 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 2.0) internal successors, (84), 41 states have internal predecessors, (84), 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 85 [2021-05-02 12:07:52,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:07:52,572 INFO L225 Difference]: With dead ends: 167 [2021-05-02 12:07:52,572 INFO L226 Difference]: Without dead ends: 162 [2021-05-02 12:07:52,572 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 86 SyntacticMatches, 1 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 709 ImplicationChecksByTransitivity, 2175.9ms TimeCoverageRelationStatistics Valid=351, Invalid=6129, Unknown=0, NotChecked=0, Total=6480 [2021-05-02 12:07:52,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2021-05-02 12:07:52,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 161. [2021-05-02 12:07:52,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 161 states, 156 states have (on average 1.0192307692307692) internal successors, (159), 156 states have internal predecessors, (159), 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 12:07:52,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 163 transitions. [2021-05-02 12:07:52,578 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 163 transitions. Word has length 85 [2021-05-02 12:07:52,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:07:52,578 INFO L480 AbstractCegarLoop]: Abstraction has 161 states and 163 transitions. [2021-05-02 12:07:52,578 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 2.0) internal successors, (84), 41 states have internal predecessors, (84), 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 12:07:52,578 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 163 transitions. [2021-05-02 12:07:52,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-02 12:07:52,578 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:07:52,578 INFO L523 BasicCegarLoop]: trace histogram [37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:07:52,788 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable75,73 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:07:52,789 INFO L428 AbstractCegarLoop]: === Iteration 77 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:07:52,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:07:52,789 INFO L82 PathProgramCache]: Analyzing trace with hash 1992848505, now seen corresponding path program 36 times [2021-05-02 12:07:52,789 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:07:52,789 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1782111553] [2021-05-02 12:07:52,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:07:52,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:07:53,571 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:07:53,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:07:53,573 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:07:53,573 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:07:53,573 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1782111553] [2021-05-02 12:07:53,573 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1782111553] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:07:53,574 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1083978589] [2021-05-02 12:07:53,574 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:07:58,743 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 38 check-sat command(s) [2021-05-02 12:07:58,743 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:07:58,748 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 103 conjunts are in the unsatisfiable core [2021-05-02 12:07:58,749 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:07:59,450 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:07:59,455 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:07:59,455 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1083978589] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:07:59,455 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:07:59,455 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 40] total 42 [2021-05-02 12:07:59,455 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [785571416] [2021-05-02 12:07:59,456 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-02 12:07:59,456 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:07:59,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-02 12:07:59,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=1603, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 12:07:59,456 INFO L87 Difference]: Start difference. First operand 161 states and 163 transitions. Second operand has 42 states, 42 states have (on average 2.0) internal successors, (84), 41 states have internal predecessors, (84), 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 12:08:02,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:08:02,268 INFO L93 Difference]: Finished difference Result 169 states and 171 transitions. [2021-05-02 12:08:02,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-02 12:08:02,268 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 2.0) internal successors, (84), 41 states have internal predecessors, (84), 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 85 [2021-05-02 12:08:02,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:08:02,269 INFO L225 Difference]: With dead ends: 169 [2021-05-02 12:08:02,269 INFO L226 Difference]: Without dead ends: 164 [2021-05-02 12:08:02,269 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 60 SyntacticMatches, 27 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 759 ImplicationChecksByTransitivity, 2627.5ms TimeCoverageRelationStatistics Valid=309, Invalid=6011, Unknown=0, NotChecked=0, Total=6320 [2021-05-02 12:08:02,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2021-05-02 12:08:02,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 163. [2021-05-02 12:08:02,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 163 states, 158 states have (on average 1.018987341772152) internal successors, (161), 158 states have internal predecessors, (161), 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 12:08:02,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 165 transitions. [2021-05-02 12:08:02,302 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 165 transitions. Word has length 85 [2021-05-02 12:08:02,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:08:02,302 INFO L480 AbstractCegarLoop]: Abstraction has 163 states and 165 transitions. [2021-05-02 12:08:02,302 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 2.0) internal successors, (84), 41 states have internal predecessors, (84), 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 12:08:02,302 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 165 transitions. [2021-05-02 12:08:02,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-05-02 12:08:02,302 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:08:02,302 INFO L523 BasicCegarLoop]: trace histogram [38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:08:02,503 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable76,74 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:08:02,503 INFO L428 AbstractCegarLoop]: === Iteration 78 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:08:02,503 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:08:02,503 INFO L82 PathProgramCache]: Analyzing trace with hash 87614826, now seen corresponding path program 38 times [2021-05-02 12:08:02,503 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:08:02,503 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1779548024] [2021-05-02 12:08:02,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:08:02,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:08:03,337 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:08:03,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:08:03,339 INFO L134 CoverageAnalysis]: Checked inductivity of 1444 backedges. 0 proven. 1444 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:08:03,339 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:08:03,339 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1779548024] [2021-05-02 12:08:03,339 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1779548024] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:08:03,339 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [650672030] [2021-05-02 12:08:03,339 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 75 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 75 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:08:03,386 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:08:03,387 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:08:03,388 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 79 conjunts are in the unsatisfiable core [2021-05-02 12:08:03,389 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:08:03,530 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:08:03,535 INFO L134 CoverageAnalysis]: Checked inductivity of 1444 backedges. 0 proven. 1444 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:08:03,535 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [650672030] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:08:03,535 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:08:03,535 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 41] total 43 [2021-05-02 12:08:03,535 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2136027242] [2021-05-02 12:08:03,535 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-02 12:08:03,535 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:08:03,536 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-02 12:08:03,536 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=1684, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 12:08:03,536 INFO L87 Difference]: Start difference. First operand 163 states and 165 transitions. Second operand has 43 states, 43 states have (on average 2.0) internal successors, (86), 42 states have internal predecessors, (86), 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 12:08:06,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:08:06,230 INFO L93 Difference]: Finished difference Result 171 states and 173 transitions. [2021-05-02 12:08:06,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-02 12:08:06,230 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.0) internal successors, (86), 42 states have internal predecessors, (86), 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 87 [2021-05-02 12:08:06,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:08:06,231 INFO L225 Difference]: With dead ends: 171 [2021-05-02 12:08:06,231 INFO L226 Difference]: Without dead ends: 166 [2021-05-02 12:08:06,231 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 88 SyntacticMatches, 1 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 747 ImplicationChecksByTransitivity, 2267.5ms TimeCoverageRelationStatistics Valid=360, Invalid=6446, Unknown=0, NotChecked=0, Total=6806 [2021-05-02 12:08:06,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2021-05-02 12:08:06,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 165. [2021-05-02 12:08:06,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 165 states, 160 states have (on average 1.01875) internal successors, (163), 160 states have internal predecessors, (163), 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 12:08:06,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 167 transitions. [2021-05-02 12:08:06,236 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 167 transitions. Word has length 87 [2021-05-02 12:08:06,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:08:06,236 INFO L480 AbstractCegarLoop]: Abstraction has 165 states and 167 transitions. [2021-05-02 12:08:06,236 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 2.0) internal successors, (86), 42 states have internal predecessors, (86), 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 12:08:06,237 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 167 transitions. [2021-05-02 12:08:06,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-05-02 12:08:06,237 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:08:06,237 INFO L523 BasicCegarLoop]: trace histogram [38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:08:06,448 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 75 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable77 [2021-05-02 12:08:06,449 INFO L428 AbstractCegarLoop]: === Iteration 79 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:08:06,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:08:06,449 INFO L82 PathProgramCache]: Analyzing trace with hash 613965494, now seen corresponding path program 37 times [2021-05-02 12:08:06,449 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:08:06,449 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [905383524] [2021-05-02 12:08:06,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:08:06,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:08:07,259 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:08:07,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:08:07,262 INFO L134 CoverageAnalysis]: Checked inductivity of 1444 backedges. 0 proven. 1444 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:08:07,262 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:08:07,262 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [905383524] [2021-05-02 12:08:07,262 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [905383524] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:08:07,262 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1203783283] [2021-05-02 12:08:07,262 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:08:07,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:08:07,337 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 79 conjunts are in the unsatisfiable core [2021-05-02 12:08:07,349 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:08:07,493 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:08:07,498 INFO L134 CoverageAnalysis]: Checked inductivity of 1444 backedges. 0 proven. 1444 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:08:07,498 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1203783283] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:08:07,498 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:08:07,499 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 41] total 43 [2021-05-02 12:08:07,499 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [940086589] [2021-05-02 12:08:07,499 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-02 12:08:07,499 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:08:07,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-02 12:08:07,499 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=1684, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 12:08:07,499 INFO L87 Difference]: Start difference. First operand 165 states and 167 transitions. Second operand has 43 states, 43 states have (on average 2.0) internal successors, (86), 42 states have internal predecessors, (86), 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 12:08:10,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:08:10,446 INFO L93 Difference]: Finished difference Result 173 states and 175 transitions. [2021-05-02 12:08:10,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-02 12:08:10,446 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.0) internal successors, (86), 42 states have internal predecessors, (86), 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 87 [2021-05-02 12:08:10,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:08:10,447 INFO L225 Difference]: With dead ends: 173 [2021-05-02 12:08:10,447 INFO L226 Difference]: Without dead ends: 168 [2021-05-02 12:08:10,447 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 88 SyntacticMatches, 1 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 745 ImplicationChecksByTransitivity, 2201.9ms TimeCoverageRelationStatistics Valid=317, Invalid=6325, Unknown=0, NotChecked=0, Total=6642 [2021-05-02 12:08:10,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-05-02 12:08:10,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 167. [2021-05-02 12:08:10,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 162 states have (on average 1.0185185185185186) internal successors, (165), 162 states have internal predecessors, (165), 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 12:08:10,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 169 transitions. [2021-05-02 12:08:10,452 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 169 transitions. Word has length 87 [2021-05-02 12:08:10,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:08:10,453 INFO L480 AbstractCegarLoop]: Abstraction has 167 states and 169 transitions. [2021-05-02 12:08:10,453 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 2.0) internal successors, (86), 42 states have internal predecessors, (86), 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 12:08:10,453 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 169 transitions. [2021-05-02 12:08:10,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-05-02 12:08:10,453 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:08:10,453 INFO L523 BasicCegarLoop]: trace histogram [39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:08:10,668 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable78,76 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:08:10,668 INFO L428 AbstractCegarLoop]: === Iteration 80 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:08:10,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:08:10,668 INFO L82 PathProgramCache]: Analyzing trace with hash -602273627, now seen corresponding path program 39 times [2021-05-02 12:08:10,668 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:08:10,668 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [503355151] [2021-05-02 12:08:10,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:08:10,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:08:11,537 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:08:11,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:08:11,540 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 0 proven. 1521 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:08:11,540 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:08:11,540 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [503355151] [2021-05-02 12:08:11,540 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [503355151] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:08:11,540 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [679472617] [2021-05-02 12:08:11,540 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 77 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 77 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:08:12,901 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 40 check-sat command(s) [2021-05-02 12:08:12,901 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:08:12,905 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 104 conjunts are in the unsatisfiable core [2021-05-02 12:08:12,906 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:08:13,648 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:08:13,654 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 0 proven. 1521 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:08:13,654 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [679472617] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:08:13,654 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:08:13,654 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42] total 44 [2021-05-02 12:08:13,654 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [827521482] [2021-05-02 12:08:13,654 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-02 12:08:13,654 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:08:13,654 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-02 12:08:13,655 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=1767, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 12:08:13,655 INFO L87 Difference]: Start difference. First operand 167 states and 169 transitions. Second operand has 44 states, 44 states have (on average 2.0) internal successors, (88), 43 states have internal predecessors, (88), 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 12:08:16,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:08:16,488 INFO L93 Difference]: Finished difference Result 175 states and 177 transitions. [2021-05-02 12:08:16,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-02 12:08:16,489 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 2.0) internal successors, (88), 43 states have internal predecessors, (88), 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 89 [2021-05-02 12:08:16,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:08:16,489 INFO L225 Difference]: With dead ends: 175 [2021-05-02 12:08:16,489 INFO L226 Difference]: Without dead ends: 170 [2021-05-02 12:08:16,490 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 67 SyntacticMatches, 24 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 832 ImplicationChecksByTransitivity, 2952.2ms TimeCoverageRelationStatistics Valid=369, Invalid=6771, Unknown=0, NotChecked=0, Total=7140 [2021-05-02 12:08:16,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2021-05-02 12:08:16,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 169. [2021-05-02 12:08:16,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 169 states, 164 states have (on average 1.0182926829268293) internal successors, (167), 164 states have internal predecessors, (167), 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 12:08:16,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 171 transitions. [2021-05-02 12:08:16,495 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 171 transitions. Word has length 89 [2021-05-02 12:08:16,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:08:16,495 INFO L480 AbstractCegarLoop]: Abstraction has 169 states and 171 transitions. [2021-05-02 12:08:16,495 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 44 states have (on average 2.0) internal successors, (88), 43 states have internal predecessors, (88), 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 12:08:16,495 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 171 transitions. [2021-05-02 12:08:16,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-05-02 12:08:16,496 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:08:16,496 INFO L523 BasicCegarLoop]: trace histogram [39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:08:16,696 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 77 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable79 [2021-05-02 12:08:16,696 INFO L428 AbstractCegarLoop]: === Iteration 81 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:08:16,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:08:16,697 INFO L82 PathProgramCache]: Analyzing trace with hash -1642680909, now seen corresponding path program 38 times [2021-05-02 12:08:16,697 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:08:16,697 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1150092305] [2021-05-02 12:08:16,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:08:16,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:08:17,560 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:08:17,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:08:17,563 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 0 proven. 1521 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:08:17,563 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:08:17,563 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1150092305] [2021-05-02 12:08:17,563 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1150092305] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:08:17,563 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2105854790] [2021-05-02 12:08:17,563 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 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:08:17,616 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:08:17,616 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:08:17,617 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 81 conjunts are in the unsatisfiable core [2021-05-02 12:08:17,618 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:08:17,767 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:08:17,773 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 0 proven. 1521 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:08:17,773 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2105854790] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:08:17,773 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:08:17,773 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42] total 44 [2021-05-02 12:08:17,773 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1728665345] [2021-05-02 12:08:17,773 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-02 12:08:17,773 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:08:17,773 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-02 12:08:17,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=1767, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 12:08:17,774 INFO L87 Difference]: Start difference. First operand 169 states and 171 transitions. Second operand has 44 states, 44 states have (on average 2.0) internal successors, (88), 43 states have internal predecessors, (88), 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 12:08:20,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:08:20,895 INFO L93 Difference]: Finished difference Result 177 states and 179 transitions. [2021-05-02 12:08:20,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-02 12:08:20,895 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 2.0) internal successors, (88), 43 states have internal predecessors, (88), 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 89 [2021-05-02 12:08:20,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:08:20,896 INFO L225 Difference]: With dead ends: 177 [2021-05-02 12:08:20,896 INFO L226 Difference]: Without dead ends: 172 [2021-05-02 12:08:20,896 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 90 SyntacticMatches, 1 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 784 ImplicationChecksByTransitivity, 2316.4ms TimeCoverageRelationStatistics Valid=325, Invalid=6647, Unknown=0, NotChecked=0, Total=6972 [2021-05-02 12:08:20,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2021-05-02 12:08:20,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 171. [2021-05-02 12:08:20,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 171 states, 166 states have (on average 1.0180722891566265) internal successors, (169), 166 states have internal predecessors, (169), 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 12:08:20,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 173 transitions. [2021-05-02 12:08:20,901 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 173 transitions. Word has length 89 [2021-05-02 12:08:20,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:08:20,901 INFO L480 AbstractCegarLoop]: Abstraction has 171 states and 173 transitions. [2021-05-02 12:08:20,901 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 44 states have (on average 2.0) internal successors, (88), 43 states have internal predecessors, (88), 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 12:08:20,901 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 173 transitions. [2021-05-02 12:08:20,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-05-02 12:08:20,902 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:08:20,902 INFO L523 BasicCegarLoop]: trace histogram [40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:08:21,117 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable80,78 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:08:21,117 INFO L428 AbstractCegarLoop]: === Iteration 82 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:08:21,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:08:21,117 INFO L82 PathProgramCache]: Analyzing trace with hash 2134853920, now seen corresponding path program 40 times [2021-05-02 12:08:21,117 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:08:21,118 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1495230588] [2021-05-02 12:08:21,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:08:21,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:08:22,010 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:08:22,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:08:22,013 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 0 proven. 1600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:08:22,013 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:08:22,013 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1495230588] [2021-05-02 12:08:22,013 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1495230588] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:08:22,013 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1079301712] [2021-05-02 12:08:22,013 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 79 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 79 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:08:22,057 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:08:22,057 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:08:22,058 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 83 conjunts are in the unsatisfiable core [2021-05-02 12:08:22,059 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:08:22,220 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:08:22,226 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 0 proven. 1600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:08:22,226 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1079301712] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:08:22,226 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:08:22,226 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 43] total 45 [2021-05-02 12:08:22,226 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [801806223] [2021-05-02 12:08:22,226 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-02 12:08:22,226 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:08:22,226 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-02 12:08:22,226 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1852, Unknown=0, NotChecked=0, Total=1980 [2021-05-02 12:08:22,227 INFO L87 Difference]: Start difference. First operand 171 states and 173 transitions. Second operand has 45 states, 45 states have (on average 2.0) internal successors, (90), 44 states have internal predecessors, (90), 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 12:08:25,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:08:25,250 INFO L93 Difference]: Finished difference Result 179 states and 181 transitions. [2021-05-02 12:08:25,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-02 12:08:25,251 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 2.0) internal successors, (90), 44 states have internal predecessors, (90), 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 91 [2021-05-02 12:08:25,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:08:25,251 INFO L225 Difference]: With dead ends: 179 [2021-05-02 12:08:25,251 INFO L226 Difference]: Without dead ends: 174 [2021-05-02 12:08:25,251 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 92 SyntacticMatches, 1 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 826 ImplicationChecksByTransitivity, 2474.2ms TimeCoverageRelationStatistics Valid=378, Invalid=7104, Unknown=0, NotChecked=0, Total=7482 [2021-05-02 12:08:25,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2021-05-02 12:08:25,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 173. [2021-05-02 12:08:25,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 173 states, 168 states have (on average 1.0178571428571428) internal successors, (171), 168 states have internal predecessors, (171), 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 12:08:25,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 175 transitions. [2021-05-02 12:08:25,257 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 175 transitions. Word has length 91 [2021-05-02 12:08:25,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:08:25,257 INFO L480 AbstractCegarLoop]: Abstraction has 173 states and 175 transitions. [2021-05-02 12:08:25,257 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 45 states, 45 states have (on average 2.0) internal successors, (90), 44 states have internal predecessors, (90), 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 12:08:25,257 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 175 transitions. [2021-05-02 12:08:25,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-05-02 12:08:25,257 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:08:25,257 INFO L523 BasicCegarLoop]: trace histogram [40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:08:25,472 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable81,79 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:08:25,472 INFO L428 AbstractCegarLoop]: === Iteration 83 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:08:25,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:08:25,472 INFO L82 PathProgramCache]: Analyzing trace with hash -1321389712, now seen corresponding path program 39 times [2021-05-02 12:08:25,473 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:08:25,473 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [745445253] [2021-05-02 12:08:25,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:08:25,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:08:26,378 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:08:26,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:08:26,381 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 0 proven. 1600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:08:26,381 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:08:26,381 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [745445253] [2021-05-02 12:08:26,381 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [745445253] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:08:26,381 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1394411729] [2021-05-02 12:08:26,381 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 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:08:28,654 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 41 check-sat command(s) [2021-05-02 12:08:28,654 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:08:28,660 INFO L263 TraceCheckSpWp]: Trace formula consists of 287 conjuncts, 101 conjunts are in the unsatisfiable core [2021-05-02 12:08:28,661 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:08:29,362 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:08:29,368 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 0 proven. 1600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:08:29,368 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1394411729] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:08:29,368 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:08:29,368 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 43] total 45 [2021-05-02 12:08:29,368 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [86376929] [2021-05-02 12:08:29,368 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-02 12:08:29,368 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:08:29,369 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-02 12:08:29,369 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1852, Unknown=0, NotChecked=0, Total=1980 [2021-05-02 12:08:29,369 INFO L87 Difference]: Start difference. First operand 173 states and 175 transitions. Second operand has 45 states, 45 states have (on average 2.0) internal successors, (90), 44 states have internal predecessors, (90), 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 12:08:32,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:08:32,591 INFO L93 Difference]: Finished difference Result 181 states and 183 transitions. [2021-05-02 12:08:32,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-02 12:08:32,591 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 2.0) internal successors, (90), 44 states have internal predecessors, (90), 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 91 [2021-05-02 12:08:32,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:08:32,592 INFO L225 Difference]: With dead ends: 181 [2021-05-02 12:08:32,592 INFO L226 Difference]: Without dead ends: 176 [2021-05-02 12:08:32,592 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 74 SyntacticMatches, 19 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 860 ImplicationChecksByTransitivity, 2934.1ms TimeCoverageRelationStatistics Valid=333, Invalid=6977, Unknown=0, NotChecked=0, Total=7310 [2021-05-02 12:08:32,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 176 states. [2021-05-02 12:08:32,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 176 to 175. [2021-05-02 12:08:32,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 175 states, 170 states have (on average 1.0176470588235293) internal successors, (173), 170 states have internal predecessors, (173), 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 12:08:32,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 177 transitions. [2021-05-02 12:08:32,598 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 177 transitions. Word has length 91 [2021-05-02 12:08:32,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:08:32,598 INFO L480 AbstractCegarLoop]: Abstraction has 175 states and 177 transitions. [2021-05-02 12:08:32,598 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 45 states, 45 states have (on average 2.0) internal successors, (90), 44 states have internal predecessors, (90), 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 12:08:32,598 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 177 transitions. [2021-05-02 12:08:32,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-05-02 12:08:32,598 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:08:32,598 INFO L523 BasicCegarLoop]: trace histogram [41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:08:32,810 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable82,80 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:08:32,810 INFO L428 AbstractCegarLoop]: === Iteration 84 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:08:32,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:08:32,810 INFO L82 PathProgramCache]: Analyzing trace with hash -300525861, now seen corresponding path program 41 times [2021-05-02 12:08:32,810 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:08:32,810 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1493144639] [2021-05-02 12:08:32,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:08:32,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:08:33,741 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:08:33,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:08:33,743 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 0 proven. 1681 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:08:33,743 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:08:33,743 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1493144639] [2021-05-02 12:08:33,743 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1493144639] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:08:33,743 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1898836580] [2021-05-02 12:08:33,743 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 81 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 81 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:08:56,753 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 42 check-sat command(s) [2021-05-02 12:08:56,753 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:08:56,762 INFO L263 TraceCheckSpWp]: Trace formula consists of 251 conjuncts, 120 conjunts are in the unsatisfiable core [2021-05-02 12:08:56,763 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:08:57,719 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:08:57,727 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 0 proven. 1681 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:08:57,727 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1898836580] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:08:57,727 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:08:57,727 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 44] total 46 [2021-05-02 12:08:57,727 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [375689759] [2021-05-02 12:08:57,728 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-02 12:08:57,728 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:08:57,728 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-02 12:08:57,728 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=1939, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 12:08:57,728 INFO L87 Difference]: Start difference. First operand 175 states and 177 transitions. Second operand has 46 states, 46 states have (on average 2.0) internal successors, (92), 45 states have internal predecessors, (92), 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 12:09:00,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:09:00,935 INFO L93 Difference]: Finished difference Result 183 states and 185 transitions. [2021-05-02 12:09:00,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-02 12:09:00,936 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 2.0) internal successors, (92), 45 states have internal predecessors, (92), 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 93 [2021-05-02 12:09:00,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:09:00,936 INFO L225 Difference]: With dead ends: 183 [2021-05-02 12:09:00,936 INFO L226 Difference]: Without dead ends: 178 [2021-05-02 12:09:00,937 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 59 SyntacticMatches, 36 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 937 ImplicationChecksByTransitivity, 3345.5ms TimeCoverageRelationStatistics Valid=387, Invalid=7445, Unknown=0, NotChecked=0, Total=7832 [2021-05-02 12:09:00,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2021-05-02 12:09:00,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 177. [2021-05-02 12:09:00,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 177 states, 172 states have (on average 1.0174418604651163) internal successors, (175), 172 states have internal predecessors, (175), 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 12:09:00,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 179 transitions. [2021-05-02 12:09:00,942 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 179 transitions. Word has length 93 [2021-05-02 12:09:00,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:09:00,942 INFO L480 AbstractCegarLoop]: Abstraction has 177 states and 179 transitions. [2021-05-02 12:09:00,942 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 46 states have (on average 2.0) internal successors, (92), 45 states have internal predecessors, (92), 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 12:09:00,942 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 179 transitions. [2021-05-02 12:09:00,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-05-02 12:09:00,943 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:09:00,943 INFO L523 BasicCegarLoop]: trace histogram [41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:09:01,143 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable83,81 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:09:01,144 INFO L428 AbstractCegarLoop]: === Iteration 85 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:09:01,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:09:01,144 INFO L82 PathProgramCache]: Analyzing trace with hash -1798194707, now seen corresponding path program 40 times [2021-05-02 12:09:01,144 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:09:01,145 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1468627786] [2021-05-02 12:09:01,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:09:01,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:09:01,974 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:09:01,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:09:01,978 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 0 proven. 1681 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:09:01,978 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:09:01,978 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1468627786] [2021-05-02 12:09:01,979 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1468627786] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:09:01,979 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [725923512] [2021-05-02 12:09:01,979 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 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:09:02,032 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:09:02,032 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:09:02,034 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 85 conjunts are in the unsatisfiable core [2021-05-02 12:09:02,035 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:09:02,172 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:09:02,177 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 0 proven. 1681 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:09:02,177 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [725923512] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:09:02,177 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:09:02,177 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 44] total 46 [2021-05-02 12:09:02,177 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [124325568] [2021-05-02 12:09:02,178 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-02 12:09:02,178 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:09:02,178 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-02 12:09:02,178 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=1939, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 12:09:02,178 INFO L87 Difference]: Start difference. First operand 177 states and 179 transitions. Second operand has 46 states, 46 states have (on average 2.0) internal successors, (92), 45 states have internal predecessors, (92), 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 12:09:05,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:09:05,665 INFO L93 Difference]: Finished difference Result 185 states and 187 transitions. [2021-05-02 12:09:05,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-02 12:09:05,665 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 2.0) internal successors, (92), 45 states have internal predecessors, (92), 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 93 [2021-05-02 12:09:05,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:09:05,666 INFO L225 Difference]: With dead ends: 185 [2021-05-02 12:09:05,666 INFO L226 Difference]: Without dead ends: 180 [2021-05-02 12:09:05,666 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 94 SyntacticMatches, 1 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 865 ImplicationChecksByTransitivity, 2398.4ms TimeCoverageRelationStatistics Valid=341, Invalid=7315, Unknown=0, NotChecked=0, Total=7656 [2021-05-02 12:09:05,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2021-05-02 12:09:05,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 179. [2021-05-02 12:09:05,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 174 states have (on average 1.0172413793103448) internal successors, (177), 174 states have internal predecessors, (177), 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 12:09:05,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 181 transitions. [2021-05-02 12:09:05,672 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 181 transitions. Word has length 93 [2021-05-02 12:09:05,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:09:05,672 INFO L480 AbstractCegarLoop]: Abstraction has 179 states and 181 transitions. [2021-05-02 12:09:05,672 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 46 states have (on average 2.0) internal successors, (92), 45 states have internal predecessors, (92), 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 12:09:05,672 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 181 transitions. [2021-05-02 12:09:05,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-05-02 12:09:05,672 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:09:05,672 INFO L523 BasicCegarLoop]: trace histogram [42, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:09:05,873 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable84,82 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:09:05,874 INFO L428 AbstractCegarLoop]: === Iteration 86 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:09:05,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:09:05,874 INFO L82 PathProgramCache]: Analyzing trace with hash 56680918, now seen corresponding path program 42 times [2021-05-02 12:09:05,875 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:09:05,875 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1926659228] [2021-05-02 12:09:05,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:09:05,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:09:06,906 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:09:06,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:09:06,909 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 0 proven. 1764 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:09:06,909 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:09:06,909 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1926659228] [2021-05-02 12:09:06,910 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1926659228] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:09:06,910 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [841258053] [2021-05-02 12:09:06,910 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 83 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 83 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:09:12,918 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 43 check-sat command(s) [2021-05-02 12:09:12,919 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:09:12,928 INFO L263 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 94 conjunts are in the unsatisfiable core [2021-05-02 12:09:12,929 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:09:14,271 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 0 proven. 1764 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:09:14,271 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [841258053] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:09:14,271 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:09:14,271 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 45] total 68 [2021-05-02 12:09:14,271 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2035519218] [2021-05-02 12:09:14,271 INFO L460 AbstractCegarLoop]: Interpolant automaton has 68 states [2021-05-02 12:09:14,271 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:09:14,272 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-05-02 12:09:14,272 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=218, Invalid=4338, Unknown=0, NotChecked=0, Total=4556 [2021-05-02 12:09:14,272 INFO L87 Difference]: Start difference. First operand 179 states and 181 transitions. Second operand has 68 states, 68 states have (on average 2.0) internal successors, (136), 67 states have internal predecessors, (136), 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 12:09:18,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:09:18,138 INFO L93 Difference]: Finished difference Result 187 states and 189 transitions. [2021-05-02 12:09:18,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-02 12:09:18,139 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 2.0) internal successors, (136), 67 states have internal predecessors, (136), 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 95 [2021-05-02 12:09:18,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:09:18,139 INFO L225 Difference]: With dead ends: 187 [2021-05-02 12:09:18,139 INFO L226 Difference]: Without dead ends: 182 [2021-05-02 12:09:18,140 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 74 SyntacticMatches, 2 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2085 ImplicationChecksByTransitivity, 3835.7ms TimeCoverageRelationStatistics Valid=501, Invalid=11931, Unknown=0, NotChecked=0, Total=12432 [2021-05-02 12:09:18,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2021-05-02 12:09:18,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 181. [2021-05-02 12:09:18,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181 states, 176 states have (on average 1.0170454545454546) internal successors, (179), 176 states have internal predecessors, (179), 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 12:09:18,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 183 transitions. [2021-05-02 12:09:18,146 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 183 transitions. Word has length 95 [2021-05-02 12:09:18,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:09:18,146 INFO L480 AbstractCegarLoop]: Abstraction has 181 states and 183 transitions. [2021-05-02 12:09:18,146 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 68 states, 68 states have (on average 2.0) internal successors, (136), 67 states have internal predecessors, (136), 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 12:09:18,146 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 183 transitions. [2021-05-02 12:09:18,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-05-02 12:09:18,147 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:09:18,147 INFO L523 BasicCegarLoop]: trace histogram [42, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:09:18,347 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable85,83 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:09:18,348 INFO L428 AbstractCegarLoop]: === Iteration 87 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:09:18,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:09:18,348 INFO L82 PathProgramCache]: Analyzing trace with hash -446294230, now seen corresponding path program 41 times [2021-05-02 12:09:18,348 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:09:18,348 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1843622769] [2021-05-02 12:09:18,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:09:18,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:09:19,390 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:09:19,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:09:19,392 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 0 proven. 1764 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:09:19,392 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:09:19,392 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1843622769] [2021-05-02 12:09:19,392 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1843622769] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:09:19,392 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1157252234] [2021-05-02 12:09:19,393 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 84 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 84 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:09:35,379 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 43 check-sat command(s) [2021-05-02 12:09:35,379 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:09:35,388 INFO L263 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 128 conjunts are in the unsatisfiable core [2021-05-02 12:09:35,389 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:09:36,586 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:09:36,592 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 0 proven. 1764 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:09:36,593 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1157252234] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:09:36,593 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:09:36,593 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 45] total 47 [2021-05-02 12:09:36,593 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [993937675] [2021-05-02 12:09:36,593 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-02 12:09:36,593 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:09:36,593 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-02 12:09:36,593 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=2028, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 12:09:36,594 INFO L87 Difference]: Start difference. First operand 181 states and 183 transitions. Second operand has 47 states, 47 states have (on average 2.0) internal successors, (94), 46 states have internal predecessors, (94), 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 12:09:40,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:09:40,190 INFO L93 Difference]: Finished difference Result 189 states and 191 transitions. [2021-05-02 12:09:40,190 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-02 12:09:40,190 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 2.0) internal successors, (94), 46 states have internal predecessors, (94), 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 95 [2021-05-02 12:09:40,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:09:40,191 INFO L225 Difference]: With dead ends: 189 [2021-05-02 12:09:40,191 INFO L226 Difference]: Without dead ends: 184 [2021-05-02 12:09:40,192 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 55 SyntacticMatches, 42 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 989 ImplicationChecksByTransitivity, 3604.7ms TimeCoverageRelationStatistics Valid=349, Invalid=7661, Unknown=0, NotChecked=0, Total=8010 [2021-05-02 12:09:40,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2021-05-02 12:09:40,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 183. [2021-05-02 12:09:40,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 183 states, 178 states have (on average 1.0168539325842696) internal successors, (181), 178 states have internal predecessors, (181), 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 12:09:40,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 185 transitions. [2021-05-02 12:09:40,197 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 185 transitions. Word has length 95 [2021-05-02 12:09:40,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:09:40,197 INFO L480 AbstractCegarLoop]: Abstraction has 183 states and 185 transitions. [2021-05-02 12:09:40,197 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 2.0) internal successors, (94), 46 states have internal predecessors, (94), 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 12:09:40,198 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 185 transitions. [2021-05-02 12:09:40,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-05-02 12:09:40,198 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:09:40,198 INFO L523 BasicCegarLoop]: trace histogram [43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:09:40,398 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable86,84 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:09:40,399 INFO L428 AbstractCegarLoop]: === Iteration 88 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:09:40,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:09:40,399 INFO L82 PathProgramCache]: Analyzing trace with hash -264988143, now seen corresponding path program 43 times [2021-05-02 12:09:40,399 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:09:40,399 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1527225922] [2021-05-02 12:09:40,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:09:40,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:09:41,449 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:09:41,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:09:41,452 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 0 proven. 1849 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:09:41,452 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:09:41,452 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1527225922] [2021-05-02 12:09:41,452 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1527225922] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:09:41,452 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2023565729] [2021-05-02 12:09:41,452 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 85 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 85 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:09:41,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:09:41,497 INFO L263 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 89 conjunts are in the unsatisfiable core [2021-05-02 12:09:41,498 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:09:41,668 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:09:41,674 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 0 proven. 1849 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:09:41,674 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2023565729] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:09:41,674 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:09:41,674 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 46] total 48 [2021-05-02 12:09:41,675 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1755358187] [2021-05-02 12:09:41,675 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2021-05-02 12:09:41,675 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:09:41,675 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-05-02 12:09:41,675 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=2119, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 12:09:41,675 INFO L87 Difference]: Start difference. First operand 183 states and 185 transitions. Second operand has 48 states, 48 states have (on average 2.0) internal successors, (96), 47 states have internal predecessors, (96), 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 12:09:45,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:09:45,210 INFO L93 Difference]: Finished difference Result 191 states and 193 transitions. [2021-05-02 12:09:45,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-05-02 12:09:45,211 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 2.0) internal successors, (96), 47 states have internal predecessors, (96), 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 97 [2021-05-02 12:09:45,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:09:45,211 INFO L225 Difference]: With dead ends: 191 [2021-05-02 12:09:45,211 INFO L226 Difference]: Without dead ends: 186 [2021-05-02 12:09:45,212 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 98 SyntacticMatches, 1 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 952 ImplicationChecksByTransitivity, 2838.1ms TimeCoverageRelationStatistics Valid=405, Invalid=8151, Unknown=0, NotChecked=0, Total=8556 [2021-05-02 12:09:45,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2021-05-02 12:09:45,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 185. [2021-05-02 12:09:45,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 185 states, 180 states have (on average 1.0166666666666666) internal successors, (183), 180 states have internal predecessors, (183), 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 12:09:45,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 187 transitions. [2021-05-02 12:09:45,226 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 187 transitions. Word has length 97 [2021-05-02 12:09:45,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:09:45,226 INFO L480 AbstractCegarLoop]: Abstraction has 185 states and 187 transitions. [2021-05-02 12:09:45,226 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 48 states, 48 states have (on average 2.0) internal successors, (96), 47 states have internal predecessors, (96), 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 12:09:45,226 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 187 transitions. [2021-05-02 12:09:45,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-05-02 12:09:45,226 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:09:45,226 INFO L523 BasicCegarLoop]: trace histogram [43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:09:45,436 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 85 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable87 [2021-05-02 12:09:45,437 INFO L428 AbstractCegarLoop]: === Iteration 89 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:09:45,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:09:45,437 INFO L82 PathProgramCache]: Analyzing trace with hash 1649940775, now seen corresponding path program 42 times [2021-05-02 12:09:45,437 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:09:45,437 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [223394230] [2021-05-02 12:09:45,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:09:45,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:09:46,480 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:09:46,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:09:46,482 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 0 proven. 1849 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:09:46,482 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:09:46,483 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [223394230] [2021-05-02 12:09:46,483 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [223394230] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:09:46,483 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1487325741] [2021-05-02 12:09:46,483 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 86 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 86 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:09:54,782 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 44 check-sat command(s) [2021-05-02 12:09:54,783 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:09:54,790 INFO L263 TraceCheckSpWp]: Trace formula consists of 302 conjuncts, 125 conjunts are in the unsatisfiable core [2021-05-02 12:09:54,791 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:09:55,880 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:09:55,886 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 0 proven. 1849 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:09:55,886 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1487325741] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:09:55,886 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:09:55,886 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 46] total 48 [2021-05-02 12:09:55,886 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1390599988] [2021-05-02 12:09:55,886 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2021-05-02 12:09:55,886 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:09:55,887 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-05-02 12:09:55,887 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=2119, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 12:09:55,887 INFO L87 Difference]: Start difference. First operand 185 states and 187 transitions. Second operand has 48 states, 48 states have (on average 2.0) internal successors, (96), 47 states have internal predecessors, (96), 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 12:09:59,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:09:59,692 INFO L93 Difference]: Finished difference Result 193 states and 195 transitions. [2021-05-02 12:09:59,692 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-02 12:09:59,692 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 2.0) internal successors, (96), 47 states have internal predecessors, (96), 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 97 [2021-05-02 12:09:59,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:09:59,693 INFO L225 Difference]: With dead ends: 193 [2021-05-02 12:09:59,693 INFO L226 Difference]: Without dead ends: 188 [2021-05-02 12:09:59,693 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 62 SyntacticMatches, 37 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1022 ImplicationChecksByTransitivity, 3661.3ms TimeCoverageRelationStatistics Valid=357, Invalid=8015, Unknown=0, NotChecked=0, Total=8372 [2021-05-02 12:09:59,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2021-05-02 12:09:59,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 187. [2021-05-02 12:09:59,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 187 states, 182 states have (on average 1.0164835164835164) internal successors, (185), 182 states have internal predecessors, (185), 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 12:09:59,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 189 transitions. [2021-05-02 12:09:59,699 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 189 transitions. Word has length 97 [2021-05-02 12:09:59,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:09:59,699 INFO L480 AbstractCegarLoop]: Abstraction has 187 states and 189 transitions. [2021-05-02 12:09:59,699 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 48 states, 48 states have (on average 2.0) internal successors, (96), 47 states have internal predecessors, (96), 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 12:09:59,699 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 189 transitions. [2021-05-02 12:09:59,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-05-02 12:09:59,700 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:09:59,700 INFO L523 BasicCegarLoop]: trace histogram [44, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:09:59,905 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable88,86 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:09:59,905 INFO L428 AbstractCegarLoop]: === Iteration 90 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:09:59,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:09:59,905 INFO L82 PathProgramCache]: Analyzing trace with hash -151310452, now seen corresponding path program 44 times [2021-05-02 12:09:59,905 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:09:59,906 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2030987182] [2021-05-02 12:09:59,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:09:59,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:10:01,000 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:10:01,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:10:01,003 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 0 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:10:01,003 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:10:01,003 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2030987182] [2021-05-02 12:10:01,003 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2030987182] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:10:01,003 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1770568132] [2021-05-02 12:10:01,003 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 87 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 87 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:10:01,054 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:10:01,054 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:10:01,055 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 91 conjunts are in the unsatisfiable core [2021-05-02 12:10:01,056 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:10:01,243 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:10:01,248 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 0 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:10:01,249 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1770568132] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:10:01,249 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:10:01,249 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 47] total 49 [2021-05-02 12:10:01,249 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1490813475] [2021-05-02 12:10:01,249 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-02 12:10:01,249 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:10:01,249 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-02 12:10:01,249 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=2212, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 12:10:01,249 INFO L87 Difference]: Start difference. First operand 187 states and 189 transitions. Second operand has 49 states, 49 states have (on average 2.0) internal successors, (98), 48 states have internal predecessors, (98), 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 12:10:04,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:10:04,934 INFO L93 Difference]: Finished difference Result 195 states and 197 transitions. [2021-05-02 12:10:04,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-02 12:10:04,934 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.0) internal successors, (98), 48 states have internal predecessors, (98), 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 99 [2021-05-02 12:10:04,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:10:04,935 INFO L225 Difference]: With dead ends: 195 [2021-05-02 12:10:04,935 INFO L226 Difference]: Without dead ends: 190 [2021-05-02 12:10:04,935 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 100 SyntacticMatches, 1 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 996 ImplicationChecksByTransitivity, 2954.0ms TimeCoverageRelationStatistics Valid=414, Invalid=8516, Unknown=0, NotChecked=0, Total=8930 [2021-05-02 12:10:04,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2021-05-02 12:10:04,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 189. [2021-05-02 12:10:04,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 189 states, 184 states have (on average 1.016304347826087) internal successors, (187), 184 states have internal predecessors, (187), 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 12:10:04,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 191 transitions. [2021-05-02 12:10:04,941 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 191 transitions. Word has length 99 [2021-05-02 12:10:04,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:10:04,941 INFO L480 AbstractCegarLoop]: Abstraction has 189 states and 191 transitions. [2021-05-02 12:10:04,941 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 49 states have (on average 2.0) internal successors, (98), 48 states have internal predecessors, (98), 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 12:10:04,941 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 191 transitions. [2021-05-02 12:10:04,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-05-02 12:10:04,942 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:10:04,942 INFO L523 BasicCegarLoop]: trace histogram [44, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:10:05,157 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 87 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable89 [2021-05-02 12:10:05,157 INFO L428 AbstractCegarLoop]: === Iteration 91 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:10:05,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:10:05,157 INFO L82 PathProgramCache]: Analyzing trace with hash 1792118756, now seen corresponding path program 43 times [2021-05-02 12:10:05,157 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:10:05,157 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2101723875] [2021-05-02 12:10:05,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:10:05,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:10:06,470 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:10:06,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:10:06,472 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 0 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:10:06,472 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:10:06,472 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2101723875] [2021-05-02 12:10:06,472 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2101723875] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:10:06,472 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [603673929] [2021-05-02 12:10:06,472 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 88 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 88 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:10:06,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:10:06,537 INFO L263 TraceCheckSpWp]: Trace formula consists of 307 conjuncts, 91 conjunts are in the unsatisfiable core [2021-05-02 12:10:06,538 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:10:06,723 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:10:06,729 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 0 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:10:06,729 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [603673929] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:10:06,729 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:10:06,729 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 47] total 49 [2021-05-02 12:10:06,729 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1177059920] [2021-05-02 12:10:06,729 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-02 12:10:06,729 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:10:06,730 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-02 12:10:06,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=2212, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 12:10:06,730 INFO L87 Difference]: Start difference. First operand 189 states and 191 transitions. Second operand has 49 states, 49 states have (on average 2.0) internal successors, (98), 48 states have internal predecessors, (98), 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 12:10:10,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:10:10,641 INFO L93 Difference]: Finished difference Result 197 states and 199 transitions. [2021-05-02 12:10:10,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-05-02 12:10:10,642 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.0) internal successors, (98), 48 states have internal predecessors, (98), 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 99 [2021-05-02 12:10:10,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:10:10,642 INFO L225 Difference]: With dead ends: 197 [2021-05-02 12:10:10,642 INFO L226 Difference]: Without dead ends: 192 [2021-05-02 12:10:10,643 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 100 SyntacticMatches, 1 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 994 ImplicationChecksByTransitivity, 3029.6ms TimeCoverageRelationStatistics Valid=365, Invalid=8377, Unknown=0, NotChecked=0, Total=8742 [2021-05-02 12:10:10,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2021-05-02 12:10:10,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 191. [2021-05-02 12:10:10,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 191 states, 186 states have (on average 1.0161290322580645) internal successors, (189), 186 states have internal predecessors, (189), 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 12:10:10,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 193 transitions. [2021-05-02 12:10:10,649 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 193 transitions. Word has length 99 [2021-05-02 12:10:10,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:10:10,649 INFO L480 AbstractCegarLoop]: Abstraction has 191 states and 193 transitions. [2021-05-02 12:10:10,649 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 49 states have (on average 2.0) internal successors, (98), 48 states have internal predecessors, (98), 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 12:10:10,649 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 193 transitions. [2021-05-02 12:10:10,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-05-02 12:10:10,649 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:10:10,649 INFO L523 BasicCegarLoop]: trace histogram [45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:10:10,864 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable90,88 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:10:10,864 INFO L428 AbstractCegarLoop]: === Iteration 92 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:10:10,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:10:10,864 INFO L82 PathProgramCache]: Analyzing trace with hash 1718768199, now seen corresponding path program 45 times [2021-05-02 12:10:10,865 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:10:10,865 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [865828443] [2021-05-02 12:10:10,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:10:10,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:10:11,847 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:10:11,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:10:11,849 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 0 proven. 2025 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:10:11,850 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:10:11,850 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [865828443] [2021-05-02 12:10:11,850 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [865828443] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:10:11,850 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [941214160] [2021-05-02 12:10:11,850 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 89 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 89 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:10:14,700 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 46 check-sat command(s) [2021-05-02 12:10:14,700 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:10:14,704 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 103 conjunts are in the unsatisfiable core [2021-05-02 12:10:14,705 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:10:15,349 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:10:15,355 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 0 proven. 2025 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:10:15,355 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [941214160] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:10:15,355 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:10:15,355 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 48] total 50 [2021-05-02 12:10:15,355 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1781090121] [2021-05-02 12:10:15,355 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-02 12:10:15,355 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:10:15,355 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-02 12:10:15,355 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=2307, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 12:10:15,355 INFO L87 Difference]: Start difference. First operand 191 states and 193 transitions. Second operand has 50 states, 50 states have (on average 2.0) internal successors, (100), 49 states have internal predecessors, (100), 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 12:10:19,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:10:19,315 INFO L93 Difference]: Finished difference Result 199 states and 201 transitions. [2021-05-02 12:10:19,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-05-02 12:10:19,315 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.0) internal successors, (100), 49 states have internal predecessors, (100), 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 101 [2021-05-02 12:10:19,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:10:19,316 INFO L225 Difference]: With dead ends: 199 [2021-05-02 12:10:19,316 INFO L226 Difference]: Without dead ends: 194 [2021-05-02 12:10:19,316 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 92 SyntacticMatches, 11 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1061 ImplicationChecksByTransitivity, 3420.9ms TimeCoverageRelationStatistics Valid=423, Invalid=8889, Unknown=0, NotChecked=0, Total=9312 [2021-05-02 12:10:19,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2021-05-02 12:10:19,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 193. [2021-05-02 12:10:19,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 188 states have (on average 1.0159574468085106) internal successors, (191), 188 states have internal predecessors, (191), 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 12:10:19,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 195 transitions. [2021-05-02 12:10:19,322 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 195 transitions. Word has length 101 [2021-05-02 12:10:19,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:10:19,323 INFO L480 AbstractCegarLoop]: Abstraction has 193 states and 195 transitions. [2021-05-02 12:10:19,323 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 2.0) internal successors, (100), 49 states have internal predecessors, (100), 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 12:10:19,323 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 195 transitions. [2021-05-02 12:10:19,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-05-02 12:10:19,323 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:10:19,323 INFO L523 BasicCegarLoop]: trace histogram [45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:10:19,527 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable91,89 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:10:19,527 INFO L428 AbstractCegarLoop]: === Iteration 93 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:10:19,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:10:19,528 INFO L82 PathProgramCache]: Analyzing trace with hash 986205025, now seen corresponding path program 44 times [2021-05-02 12:10:19,528 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:10:19,528 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1028652897] [2021-05-02 12:10:19,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:10:19,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:10:20,702 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:10:20,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:10:20,711 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 0 proven. 2025 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:10:20,711 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:10:20,711 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1028652897] [2021-05-02 12:10:20,711 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1028652897] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:10:20,711 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [247712416] [2021-05-02 12:10:20,711 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 90 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 90 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:10:20,770 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:10:20,770 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:10:20,771 INFO L263 TraceCheckSpWp]: Trace formula consists of 312 conjuncts, 93 conjunts are in the unsatisfiable core [2021-05-02 12:10:20,772 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:10:20,939 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:10:20,946 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 0 proven. 2025 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:10:20,946 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [247712416] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:10:20,946 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:10:20,946 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 48] total 50 [2021-05-02 12:10:20,946 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1048171291] [2021-05-02 12:10:20,946 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-02 12:10:20,946 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:10:20,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-02 12:10:20,947 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=2307, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 12:10:20,947 INFO L87 Difference]: Start difference. First operand 193 states and 195 transitions. Second operand has 50 states, 50 states have (on average 2.0) internal successors, (100), 49 states have internal predecessors, (100), 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 12:10:24,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:10:24,770 INFO L93 Difference]: Finished difference Result 201 states and 203 transitions. [2021-05-02 12:10:24,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-02 12:10:24,771 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.0) internal successors, (100), 49 states have internal predecessors, (100), 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 101 [2021-05-02 12:10:24,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:10:24,771 INFO L225 Difference]: With dead ends: 201 [2021-05-02 12:10:24,771 INFO L226 Difference]: Without dead ends: 196 [2021-05-02 12:10:24,772 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 102 SyntacticMatches, 1 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1039 ImplicationChecksByTransitivity, 2833.0ms TimeCoverageRelationStatistics Valid=373, Invalid=8747, Unknown=0, NotChecked=0, Total=9120 [2021-05-02 12:10:24,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2021-05-02 12:10:24,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 195. [2021-05-02 12:10:24,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 195 states, 190 states have (on average 1.0157894736842106) internal successors, (193), 190 states have internal predecessors, (193), 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 12:10:24,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 197 transitions. [2021-05-02 12:10:24,790 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 197 transitions. Word has length 101 [2021-05-02 12:10:24,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:10:24,790 INFO L480 AbstractCegarLoop]: Abstraction has 195 states and 197 transitions. [2021-05-02 12:10:24,790 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 2.0) internal successors, (100), 49 states have internal predecessors, (100), 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 12:10:24,790 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 197 transitions. [2021-05-02 12:10:24,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-05-02 12:10:24,791 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:10:24,791 INFO L523 BasicCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:10:24,991 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable92,90 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:10:24,991 INFO L428 AbstractCegarLoop]: === Iteration 94 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:10:24,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:10:24,991 INFO L82 PathProgramCache]: Analyzing trace with hash -726945214, now seen corresponding path program 46 times [2021-05-02 12:10:24,991 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:10:24,992 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1283618653] [2021-05-02 12:10:24,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:10:25,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:10:26,239 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:10:26,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:10:26,242 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:10:26,242 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:10:26,242 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1283618653] [2021-05-02 12:10:26,242 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1283618653] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:10:26,242 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [470317222] [2021-05-02 12:10:26,242 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 91 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 91 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:10:26,287 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:10:26,288 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:10:26,289 INFO L263 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 95 conjunts are in the unsatisfiable core [2021-05-02 12:10:26,290 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:10:26,476 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:10:26,482 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:10:26,482 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [470317222] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:10:26,482 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:10:26,482 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 49] total 51 [2021-05-02 12:10:26,482 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2089371776] [2021-05-02 12:10:26,482 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2021-05-02 12:10:26,482 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:10:26,482 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-05-02 12:10:26,482 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=2404, Unknown=0, NotChecked=0, Total=2550 [2021-05-02 12:10:26,483 INFO L87 Difference]: Start difference. First operand 195 states and 197 transitions. Second operand has 51 states, 51 states have (on average 2.0) internal successors, (102), 50 states have internal predecessors, (102), 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 12:10:30,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:10:30,415 INFO L93 Difference]: Finished difference Result 203 states and 205 transitions. [2021-05-02 12:10:30,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-02 12:10:30,416 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 2.0) internal successors, (102), 50 states have internal predecessors, (102), 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 103 [2021-05-02 12:10:30,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:10:30,417 INFO L225 Difference]: With dead ends: 203 [2021-05-02 12:10:30,417 INFO L226 Difference]: Without dead ends: 198 [2021-05-02 12:10:30,417 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 104 SyntacticMatches, 1 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1087 ImplicationChecksByTransitivity, 3237.8ms TimeCoverageRelationStatistics Valid=432, Invalid=9270, Unknown=0, NotChecked=0, Total=9702 [2021-05-02 12:10:30,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2021-05-02 12:10:30,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 197. [2021-05-02 12:10:30,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 197 states, 192 states have (on average 1.015625) internal successors, (195), 192 states have internal predecessors, (195), 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 12:10:30,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 199 transitions. [2021-05-02 12:10:30,423 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 199 transitions. Word has length 103 [2021-05-02 12:10:30,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:10:30,424 INFO L480 AbstractCegarLoop]: Abstraction has 197 states and 199 transitions. [2021-05-02 12:10:30,424 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 51 states, 51 states have (on average 2.0) internal successors, (102), 50 states have internal predecessors, (102), 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 12:10:30,424 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 199 transitions. [2021-05-02 12:10:30,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-05-02 12:10:30,424 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:10:30,424 INFO L523 BasicCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:10:30,641 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable93,91 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:10:30,641 INFO L428 AbstractCegarLoop]: === Iteration 95 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:10:30,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:10:30,641 INFO L82 PathProgramCache]: Analyzing trace with hash -402777186, now seen corresponding path program 45 times [2021-05-02 12:10:30,641 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:10:30,641 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1891103815] [2021-05-02 12:10:30,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:10:30,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:10:31,875 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:10:31,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:10:31,887 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:10:31,887 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:10:31,887 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1891103815] [2021-05-02 12:10:31,887 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1891103815] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:10:31,887 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1062339584] [2021-05-02 12:10:31,887 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 92 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 92 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:10:36,942 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 47 check-sat command(s) [2021-05-02 12:10:36,942 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:10:36,949 INFO L263 TraceCheckSpWp]: Trace formula consists of 317 conjuncts, 122 conjunts are in the unsatisfiable core [2021-05-02 12:10:36,950 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:10:37,866 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:10:37,871 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:10:37,871 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1062339584] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:10:37,871 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:10:37,871 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 49] total 51 [2021-05-02 12:10:37,871 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2007548927] [2021-05-02 12:10:37,871 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2021-05-02 12:10:37,871 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:10:37,872 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-05-02 12:10:37,872 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=2404, Unknown=0, NotChecked=0, Total=2550 [2021-05-02 12:10:37,872 INFO L87 Difference]: Start difference. First operand 197 states and 199 transitions. Second operand has 51 states, 51 states have (on average 2.0) internal successors, (102), 50 states have internal predecessors, (102), 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 12:10:42,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:10:42,036 INFO L93 Difference]: Finished difference Result 205 states and 207 transitions. [2021-05-02 12:10:42,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-05-02 12:10:42,037 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 2.0) internal successors, (102), 50 states have internal predecessors, (102), 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 103 [2021-05-02 12:10:42,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:10:42,037 INFO L225 Difference]: With dead ends: 205 [2021-05-02 12:10:42,037 INFO L226 Difference]: Without dead ends: 200 [2021-05-02 12:10:42,038 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 77 SyntacticMatches, 28 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1139 ImplicationChecksByTransitivity, 3750.4ms TimeCoverageRelationStatistics Valid=381, Invalid=9125, Unknown=0, NotChecked=0, Total=9506 [2021-05-02 12:10:42,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2021-05-02 12:10:42,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 199. [2021-05-02 12:10:42,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 199 states, 194 states have (on average 1.0154639175257731) internal successors, (197), 194 states have internal predecessors, (197), 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 12:10:42,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 201 transitions. [2021-05-02 12:10:42,044 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 201 transitions. Word has length 103 [2021-05-02 12:10:42,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:10:42,044 INFO L480 AbstractCegarLoop]: Abstraction has 199 states and 201 transitions. [2021-05-02 12:10:42,044 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 51 states, 51 states have (on average 2.0) internal successors, (102), 50 states have internal predecessors, (102), 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 12:10:42,044 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 201 transitions. [2021-05-02 12:10:42,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-05-02 12:10:42,044 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:10:42,045 INFO L523 BasicCegarLoop]: trace histogram [47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:10:42,245 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 92 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable94 [2021-05-02 12:10:42,245 INFO L428 AbstractCegarLoop]: === Iteration 96 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:10:42,245 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:10:42,245 INFO L82 PathProgramCache]: Analyzing trace with hash -1710424195, now seen corresponding path program 47 times [2021-05-02 12:10:42,246 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:10:42,246 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [444701602] [2021-05-02 12:10:42,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:10:42,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:10:43,526 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:10:43,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:10:43,532 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 0 proven. 2209 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:10:43,533 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:10:43,533 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [444701602] [2021-05-02 12:10:43,533 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [444701602] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:10:43,533 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [643988223] [2021-05-02 12:10:43,533 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 93 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 93 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:11:17,870 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 48 check-sat command(s) [2021-05-02 12:11:17,870 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:11:17,883 WARN L261 TraceCheckSpWp]: Trace formula consists of 275 conjuncts, 141 conjunts are in the unsatisfiable core [2021-05-02 12:11:17,884 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:11:19,181 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:11:19,188 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 0 proven. 2209 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:11:19,188 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [643988223] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:11:19,188 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:11:19,188 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 50] total 52 [2021-05-02 12:11:19,188 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [346574838] [2021-05-02 12:11:19,188 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2021-05-02 12:11:19,188 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:11:19,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-05-02 12:11:19,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=2503, Unknown=0, NotChecked=0, Total=2652 [2021-05-02 12:11:19,189 INFO L87 Difference]: Start difference. First operand 199 states and 201 transitions. Second operand has 52 states, 52 states have (on average 2.0) internal successors, (104), 51 states have internal predecessors, (104), 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 12:11:23,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:11:23,559 INFO L93 Difference]: Finished difference Result 207 states and 209 transitions. [2021-05-02 12:11:23,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-05-02 12:11:23,560 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.0) internal successors, (104), 51 states have internal predecessors, (104), 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 105 [2021-05-02 12:11:23,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:11:23,561 INFO L225 Difference]: With dead ends: 207 [2021-05-02 12:11:23,561 INFO L226 Difference]: Without dead ends: 202 [2021-05-02 12:11:23,561 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 62 SyntacticMatches, 45 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1222 ImplicationChecksByTransitivity, 4502.3ms TimeCoverageRelationStatistics Valid=441, Invalid=9659, Unknown=0, NotChecked=0, Total=10100 [2021-05-02 12:11:23,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2021-05-02 12:11:23,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 201. [2021-05-02 12:11:23,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 201 states, 196 states have (on average 1.0153061224489797) internal successors, (199), 196 states have internal predecessors, (199), 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 12:11:23,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 203 transitions. [2021-05-02 12:11:23,567 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 203 transitions. Word has length 105 [2021-05-02 12:11:23,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:11:23,568 INFO L480 AbstractCegarLoop]: Abstraction has 201 states and 203 transitions. [2021-05-02 12:11:23,568 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 52 states, 52 states have (on average 2.0) internal successors, (104), 51 states have internal predecessors, (104), 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 12:11:23,568 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 203 transitions. [2021-05-02 12:11:23,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-05-02 12:11:23,568 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:11:23,568 INFO L523 BasicCegarLoop]: trace histogram [47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:11:23,768 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable95,93 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:11:23,769 INFO L428 AbstractCegarLoop]: === Iteration 97 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:11:23,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:11:23,769 INFO L82 PathProgramCache]: Analyzing trace with hash 520147099, now seen corresponding path program 46 times [2021-05-02 12:11:23,769 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:11:23,769 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1578648663] [2021-05-02 12:11:23,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:11:23,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:11:25,069 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:11:25,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:11:25,072 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 0 proven. 2209 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:11:25,072 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:11:25,072 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1578648663] [2021-05-02 12:11:25,072 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1578648663] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:11:25,072 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2074627423] [2021-05-02 12:11:25,072 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 94 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 94 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:11:25,126 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:11:25,126 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:11:25,127 INFO L263 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 97 conjunts are in the unsatisfiable core [2021-05-02 12:11:25,128 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:11:25,341 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:11:25,348 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 0 proven. 2209 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:11:25,348 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2074627423] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:11:25,348 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:11:25,348 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 50] total 52 [2021-05-02 12:11:25,348 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1020273578] [2021-05-02 12:11:25,349 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2021-05-02 12:11:25,349 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:11:25,349 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-05-02 12:11:25,349 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=2503, Unknown=0, NotChecked=0, Total=2652 [2021-05-02 12:11:25,349 INFO L87 Difference]: Start difference. First operand 201 states and 203 transitions. Second operand has 52 states, 52 states have (on average 2.0) internal successors, (104), 51 states have internal predecessors, (104), 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 12:11:29,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:11:29,907 INFO L93 Difference]: Finished difference Result 209 states and 211 transitions. [2021-05-02 12:11:29,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-02 12:11:29,908 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.0) internal successors, (104), 51 states have internal predecessors, (104), 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 105 [2021-05-02 12:11:29,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:11:29,908 INFO L225 Difference]: With dead ends: 209 [2021-05-02 12:11:29,908 INFO L226 Difference]: Without dead ends: 204 [2021-05-02 12:11:29,909 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 106 SyntacticMatches, 1 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1132 ImplicationChecksByTransitivity, 3313.5ms TimeCoverageRelationStatistics Valid=389, Invalid=9511, Unknown=0, NotChecked=0, Total=9900 [2021-05-02 12:11:29,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2021-05-02 12:11:29,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 203. [2021-05-02 12:11:29,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 203 states, 198 states have (on average 1.0151515151515151) internal successors, (201), 198 states have internal predecessors, (201), 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 12:11:29,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 203 states to 203 states and 205 transitions. [2021-05-02 12:11:29,915 INFO L78 Accepts]: Start accepts. Automaton has 203 states and 205 transitions. Word has length 105 [2021-05-02 12:11:29,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:11:29,915 INFO L480 AbstractCegarLoop]: Abstraction has 203 states and 205 transitions. [2021-05-02 12:11:29,915 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 52 states, 52 states have (on average 2.0) internal successors, (104), 51 states have internal predecessors, (104), 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 12:11:29,915 INFO L276 IsEmpty]: Start isEmpty. Operand 203 states and 205 transitions. [2021-05-02 12:11:29,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-05-02 12:11:29,915 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:11:29,916 INFO L523 BasicCegarLoop]: trace histogram [48, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:11:30,126 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 94 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable96 [2021-05-02 12:11:30,126 INFO L428 AbstractCegarLoop]: === Iteration 98 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:11:30,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:11:30,126 INFO L82 PathProgramCache]: Analyzing trace with hash -1940919816, now seen corresponding path program 48 times [2021-05-02 12:11:30,126 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:11:30,126 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [642195620] [2021-05-02 12:11:30,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:11:30,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:11:31,405 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:11:31,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:11:31,407 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:11:31,407 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:11:31,407 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [642195620] [2021-05-02 12:11:31,407 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [642195620] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:11:31,407 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [362129257] [2021-05-02 12:11:31,407 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 95 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 95 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:11:38,421 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 49 check-sat command(s) [2021-05-02 12:11:38,421 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:11:38,427 INFO L263 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 105 conjunts are in the unsatisfiable core [2021-05-02 12:11:38,428 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:11:38,897 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:11:38,903 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:11:38,903 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [362129257] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:11:38,903 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:11:38,903 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 51] total 53 [2021-05-02 12:11:38,903 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [496219704] [2021-05-02 12:11:38,904 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2021-05-02 12:11:38,904 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:11:38,904 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-05-02 12:11:38,904 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=2604, Unknown=0, NotChecked=0, Total=2756 [2021-05-02 12:11:38,904 INFO L87 Difference]: Start difference. First operand 203 states and 205 transitions. Second operand has 53 states, 53 states have (on average 2.0) internal successors, (106), 52 states have internal predecessors, (106), 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 12:11:43,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:11:43,470 INFO L93 Difference]: Finished difference Result 211 states and 213 transitions. [2021-05-02 12:11:43,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-05-02 12:11:43,470 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 2.0) internal successors, (106), 52 states have internal predecessors, (106), 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 107 [2021-05-02 12:11:43,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:11:43,471 INFO L225 Difference]: With dead ends: 211 [2021-05-02 12:11:43,471 INFO L226 Difference]: Without dead ends: 206 [2021-05-02 12:11:43,472 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 102 SyntacticMatches, 7 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1194 ImplicationChecksByTransitivity, 3749.8ms TimeCoverageRelationStatistics Valid=450, Invalid=10056, Unknown=0, NotChecked=0, Total=10506 [2021-05-02 12:11:43,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2021-05-02 12:11:43,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 205. [2021-05-02 12:11:43,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 205 states, 200 states have (on average 1.015) internal successors, (203), 200 states have internal predecessors, (203), 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 12:11:43,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 207 transitions. [2021-05-02 12:11:43,478 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 207 transitions. Word has length 107 [2021-05-02 12:11:43,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:11:43,478 INFO L480 AbstractCegarLoop]: Abstraction has 205 states and 207 transitions. [2021-05-02 12:11:43,478 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 53 states, 53 states have (on average 2.0) internal successors, (106), 52 states have internal predecessors, (106), 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 12:11:43,478 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 207 transitions. [2021-05-02 12:11:43,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-05-02 12:11:43,479 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:11:43,479 INFO L523 BasicCegarLoop]: trace histogram [48, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:11:43,683 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable97,95 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:11:43,683 INFO L428 AbstractCegarLoop]: === Iteration 99 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:11:43,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:11:43,683 INFO L82 PathProgramCache]: Analyzing trace with hash -1607845288, now seen corresponding path program 47 times [2021-05-02 12:11:43,684 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:11:43,684 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1008947049] [2021-05-02 12:11:43,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:11:43,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:11:45,032 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:11:45,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:11:45,034 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:11:45,034 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:11:45,034 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1008947049] [2021-05-02 12:11:45,035 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1008947049] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:11:45,035 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [594358235] [2021-05-02 12:11:45,035 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 96 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 96 with z3 -smt2 -in SMTLIB2_COMPLIANT=true