/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/simple_1-2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 12:18:59,791 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 12:18:59,793 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 12:18:59,823 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 12:18:59,872 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 12:18:59,875 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 12:18:59,877 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 12:18:59,878 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 12:18:59,879 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 12:18:59,880 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 12:18:59,883 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 12:18:59,886 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 12:18:59,888 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 12:18:59,889 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 12:18:59,890 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 12:18:59,891 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 12:18:59,892 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 12:18:59,899 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 12:18:59,900 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 12:18:59,901 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 12:18:59,902 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 12:18:59,922 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 12:18:59,922 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 12:18:59,923 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 12:18:59,924 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 12:18:59,924 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 12:18:59,924 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 12:18:59,924 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 12:18:59,924 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 12:18:59,924 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 12:18:59,925 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 12:18:59,925 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 12:18:59,925 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 12:18:59,925 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 12:18:59,925 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 12:18:59,925 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 12:18:59,926 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 12:18:59,926 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 12:18:59,926 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 12:18:59,926 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 12:18:59,926 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 12:18:59,926 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 12:18:59,927 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 12:18:59,927 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 12:18:59,927 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 12:18:59,927 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 12:18:59,927 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 12:18:59,927 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 12:18:59,928 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 12:18:59,928 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 12:19:00,247 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 12:19:00,279 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 12:19:00,281 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 12:19:00,282 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 12:19:00,283 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 12:19:00,283 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/simple_1-2.c [2021-05-02 12:19:00,348 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5baed6089/6cd0ea6828a94fe7862033a913139047/FLAGb56b665c7 [2021-05-02 12:19:00,763 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 12:19:00,763 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/simple_1-2.c [2021-05-02 12:19:00,769 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5baed6089/6cd0ea6828a94fe7862033a913139047/FLAGb56b665c7 [2021-05-02 12:19:00,788 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5baed6089/6cd0ea6828a94fe7862033a913139047 [2021-05-02 12:19:00,792 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 12:19:00,795 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 12:19:00,798 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 12:19:00,798 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 12:19:00,802 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 12:19:00,803 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 12:19:00" (1/1) ... [2021-05-02 12:19:00,804 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@49edae2e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:19:00, skipping insertion in model container [2021-05-02 12:19:00,804 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 12:19:00" (1/1) ... [2021-05-02 12:19:00,811 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 12:19:00,827 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 12:19:00,971 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/simple_1-2.c[322,335] [2021-05-02 12:19:00,979 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 12:19:00,995 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 12:19:01,005 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/simple_1-2.c[322,335] [2021-05-02 12:19:01,007 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 12:19:01,035 INFO L208 MainTranslator]: Completed translation [2021-05-02 12:19:01,035 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:19:01 WrapperNode [2021-05-02 12:19:01,036 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 12:19:01,037 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 12:19:01,037 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 12:19:01,037 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 12:19:01,062 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:19:01" (1/1) ... [2021-05-02 12:19:01,062 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:19:01" (1/1) ... [2021-05-02 12:19:01,066 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:19:01" (1/1) ... [2021-05-02 12:19:01,067 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:19:01" (1/1) ... [2021-05-02 12:19:01,070 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:19:01" (1/1) ... [2021-05-02 12:19:01,074 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:19:01" (1/1) ... [2021-05-02 12:19:01,075 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:19:01" (1/1) ... [2021-05-02 12:19:01,076 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 12:19:01,077 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 12:19:01,077 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 12:19:01,077 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 12:19:01,078 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:19:01" (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 12:19:01,147 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 12:19:01,148 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 12:19:01,148 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 12:19:01,148 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 12:19:01,148 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 12:19:01,148 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 12:19:01,149 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 12:19:01,149 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 12:19:01,149 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 12:19:01,150 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 12:19:01,150 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 12:19:01,150 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 12:19:01,151 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 12:19:01,151 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 12:19:01,151 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 12:19:01,151 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 12:19:01,152 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 12:19:01,387 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 12:19:01,388 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 12:19:01,389 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 12:19:01 BoogieIcfgContainer [2021-05-02 12:19:01,389 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 12:19:01,390 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 12:19:01,390 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 12:19:01,396 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 12:19:01,396 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 12:19:00" (1/3) ... [2021-05-02 12:19:01,397 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2ee53ad9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 12:19:01, skipping insertion in model container [2021-05-02 12:19:01,397 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:19:01" (2/3) ... [2021-05-02 12:19:01,398 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2ee53ad9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 12:19:01, skipping insertion in model container [2021-05-02 12:19:01,398 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 12:19:01" (3/3) ... [2021-05-02 12:19:01,399 INFO L111 eAbstractionObserver]: Analyzing ICFG simple_1-2.c [2021-05-02 12:19:01,408 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 12:19:01,412 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 12:19:01,428 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 12:19:01,458 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 12:19:01,458 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 12:19:01,458 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 12:19:01,458 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 12:19:01,458 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 12:19:01,458 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 12:19:01,458 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 12:19:01,458 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 12:19:01,477 INFO L276 IsEmpty]: Start isEmpty. Operand has 18 states, 10 states have (on average 1.4) internal successors, (14), 11 states have internal predecessors, (14), 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 12:19:01,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 12:19:01,482 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:01,482 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:01,482 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:01,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:01,488 INFO L82 PathProgramCache]: Analyzing trace with hash -219174432, now seen corresponding path program 1 times [2021-05-02 12:19:01,496 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:01,496 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1760028640] [2021-05-02 12:19:01,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:01,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:01,718 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:01,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:01,731 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 12:19:01,731 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:01,731 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1760028640] [2021-05-02 12:19:01,732 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1760028640] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 12:19:01,732 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 12:19:01,732 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 12:19:01,733 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1041211299] [2021-05-02 12:19:01,737 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 12:19:01,737 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:01,751 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 12:19:01,752 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 12:19:01,754 INFO L87 Difference]: Start difference. First operand has 18 states, 10 states have (on average 1.4) internal successors, (14), 11 states have internal predecessors, (14), 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 12:19:01,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:01,846 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2021-05-02 12:19:01,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 12:19:01,849 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 12:19:01,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:01,855 INFO L225 Difference]: With dead ends: 29 [2021-05-02 12:19:01,856 INFO L226 Difference]: Without dead ends: 12 [2021-05-02 12:19:01,860 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 38.9ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 12:19:01,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2021-05-02 12:19:01,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2021-05-02 12:19:01,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 7 states have internal predecessors, (8), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:01,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2021-05-02 12:19:01,898 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 11 [2021-05-02 12:19:01,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:01,899 INFO L480 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2021-05-02 12:19:01,899 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 12:19:01,900 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2021-05-02 12:19:01,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 12:19:01,901 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:01,901 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:01,902 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 12:19:01,902 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:01,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:01,903 INFO L82 PathProgramCache]: Analyzing trace with hash -222868516, now seen corresponding path program 1 times [2021-05-02 12:19:01,903 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:01,903 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1492221870] [2021-05-02 12:19:01,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:01,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:02,053 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:02,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:02,084 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 12:19:02,085 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:02,085 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1492221870] [2021-05-02 12:19:02,085 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1492221870] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 12:19:02,087 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 12:19:02,087 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 12:19:02,088 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [207493651] [2021-05-02 12:19:02,089 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 12:19:02,089 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:02,094 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 12:19:02,095 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 12:19:02,095 INFO L87 Difference]: Start difference. First operand 12 states and 12 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 12:19:02,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:02,163 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2021-05-02 12:19:02,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 12:19:02,164 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 12:19:02,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:02,166 INFO L225 Difference]: With dead ends: 18 [2021-05-02 12:19:02,166 INFO L226 Difference]: Without dead ends: 13 [2021-05-02 12:19:02,167 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 66.0ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 12:19:02,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-05-02 12:19:02,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-05-02 12:19:02,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 8 states have (on average 1.125) internal successors, (9), 8 states have internal predecessors, (9), 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 12:19:02,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2021-05-02 12:19:02,178 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2021-05-02 12:19:02,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:02,178 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2021-05-02 12:19:02,178 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 12:19:02,179 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2021-05-02 12:19:02,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-02 12:19:02,179 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:02,179 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:02,179 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 12:19:02,179 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:02,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:02,184 INFO L82 PathProgramCache]: Analyzing trace with hash 1717471862, now seen corresponding path program 1 times [2021-05-02 12:19:02,185 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:02,186 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [718479393] [2021-05-02 12:19:02,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:02,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:02,283 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:02,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:02,292 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 12:19:02,292 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:02,293 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [718479393] [2021-05-02 12:19:02,293 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [718479393] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:02,293 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1594974657] [2021-05-02 12:19:02,293 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 12:19:02,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:02,350 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 12:19:02,354 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:02,402 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 12:19:02,403 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1594974657] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:02,403 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:02,403 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-02 12:19:02,403 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1577210729] [2021-05-02 12:19:02,404 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 12:19:02,404 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:02,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 12:19:02,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 12:19:02,405 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (4), 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 12:19:02,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:02,492 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2021-05-02 12:19:02,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 12:19:02,492 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (4), 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 12 [2021-05-02 12:19:02,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:02,493 INFO L225 Difference]: With dead ends: 19 [2021-05-02 12:19:02,493 INFO L226 Difference]: Without dead ends: 14 [2021-05-02 12:19:02,493 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 85.1ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-02 12:19:02,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-05-02 12:19:02,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-05-02 12:19:02,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 9 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 12:19:02,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2021-05-02 12:19:02,497 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2021-05-02 12:19:02,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:02,498 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2021-05-02 12:19:02,498 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (4), 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 12:19:02,498 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2021-05-02 12:19:02,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-05-02 12:19:02,498 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:02,498 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:02,699 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 12:19:02,699 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:02,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:02,700 INFO L82 PathProgramCache]: Analyzing trace with hash 1738481436, now seen corresponding path program 2 times [2021-05-02 12:19:02,700 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:02,700 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1005800687] [2021-05-02 12:19:02,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:02,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:02,809 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:02,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:02,835 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:02,835 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:02,836 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1005800687] [2021-05-02 12:19:02,836 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1005800687] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:02,836 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [747199405] [2021-05-02 12:19:02,836 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 12:19:02,875 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:19:02,875 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:02,877 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 12:19:02,878 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:02,922 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:02,939 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:02,940 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [747199405] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:02,940 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:02,940 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 12:19:02,940 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1757576797] [2021-05-02 12:19:02,941 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 12:19:02,941 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:02,941 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 12:19:02,942 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-02 12:19:02,942 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 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 12:19:03,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:03,091 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2021-05-02 12:19:03,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 12:19:03,091 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 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 12:19:03,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:03,092 INFO L225 Difference]: With dead ends: 20 [2021-05-02 12:19:03,092 INFO L226 Difference]: Without dead ends: 15 [2021-05-02 12:19:03,093 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 159.3ms TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-05-02 12:19:03,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-05-02 12:19:03,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-05-02 12:19:03,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.1) internal successors, (11), 10 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:03,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2021-05-02 12:19:03,098 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2021-05-02 12:19:03,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:03,099 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2021-05-02 12:19:03,099 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 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 12:19:03,099 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2021-05-02 12:19:03,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 12:19:03,099 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:03,099 INFO L523 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:03,300 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:03,300 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:03,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:03,301 INFO L82 PathProgramCache]: Analyzing trace with hash -1905189066, now seen corresponding path program 3 times [2021-05-02 12:19:03,301 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:03,301 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [338842405] [2021-05-02 12:19:03,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:03,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:03,400 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:03,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:03,421 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:03,422 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:03,422 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [338842405] [2021-05-02 12:19:03,422 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [338842405] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:03,422 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1800115267] [2021-05-02 12:19:03,422 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:03,489 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 12:19:03,489 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:03,490 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 12:19:03,491 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:03,548 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:03,574 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:03,575 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1800115267] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:03,575 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:03,575 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 12:19:03,575 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [873821832] [2021-05-02 12:19:03,576 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 12:19:03,576 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:03,576 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 12:19:03,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-02 12:19:03,576 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand has 8 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 2 states have call successors, (4), 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 12:19:03,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:03,722 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2021-05-02 12:19:03,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 12:19:03,722 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 2 states have call successors, (4), 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 14 [2021-05-02 12:19:03,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:03,724 INFO L225 Difference]: With dead ends: 21 [2021-05-02 12:19:03,724 INFO L226 Difference]: Without dead ends: 16 [2021-05-02 12:19:03,725 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 149.6ms TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2021-05-02 12:19:03,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-05-02 12:19:03,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2021-05-02 12:19:03,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.0909090909090908) internal successors, (12), 11 states have internal predecessors, (12), 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 12:19:03,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2021-05-02 12:19:03,732 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2021-05-02 12:19:03,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:03,732 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2021-05-02 12:19:03,732 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 2 states have call successors, (4), 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 12:19:03,732 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2021-05-02 12:19:03,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 12:19:03,733 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:03,733 INFO L523 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:03,937 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:03,937 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:03,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:03,938 INFO L82 PathProgramCache]: Analyzing trace with hash 1105142364, now seen corresponding path program 4 times [2021-05-02 12:19:03,938 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:03,938 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [532275689] [2021-05-02 12:19:03,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:03,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:04,070 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:04,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:04,078 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:04,079 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:04,079 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [532275689] [2021-05-02 12:19:04,079 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [532275689] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:04,079 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [736477287] [2021-05-02 12:19:04,079 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 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 12:19:04,125 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:19:04,126 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:04,126 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 12:19:04,128 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:04,197 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:04,206 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:04,207 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [736477287] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:04,207 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:04,207 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-02 12:19:04,207 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1188469416] [2021-05-02 12:19:04,208 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 12:19:04,208 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:04,208 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 12:19:04,208 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-05-02 12:19:04,209 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand has 9 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 8 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 12:19:04,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:04,434 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2021-05-02 12:19:04,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 12:19:04,435 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 8 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 12:19:04,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:04,436 INFO L225 Difference]: With dead ends: 22 [2021-05-02 12:19:04,436 INFO L226 Difference]: Without dead ends: 17 [2021-05-02 12:19:04,436 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 243.5ms TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2021-05-02 12:19:04,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-02 12:19:04,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-05-02 12:19:04,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.0833333333333333) internal successors, (13), 12 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:04,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2021-05-02 12:19:04,441 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2021-05-02 12:19:04,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:04,441 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2021-05-02 12:19:04,441 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 8 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 12:19:04,441 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2021-05-02 12:19:04,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-05-02 12:19:04,442 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:04,442 INFO L523 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:04,657 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:04,657 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:04,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:04,658 INFO L82 PathProgramCache]: Analyzing trace with hash -63863818, now seen corresponding path program 5 times [2021-05-02 12:19:04,658 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:04,658 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [358260446] [2021-05-02 12:19:04,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:04,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:04,816 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:04,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:04,826 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:04,826 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:04,826 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [358260446] [2021-05-02 12:19:04,826 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [358260446] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:04,826 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [805862966] [2021-05-02 12:19:04,827 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 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 12:19:04,882 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-02 12:19:04,882 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:04,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 12:19:04,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:04,951 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:04,963 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:04,963 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [805862966] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:04,963 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:04,964 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-02 12:19:04,964 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1792111816] [2021-05-02 12:19:04,965 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 12:19:04,965 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:04,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 12:19:04,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-05-02 12:19:04,966 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand has 10 states, 10 states have (on average 1.5) internal successors, (15), 9 states have internal predecessors, (15), 2 states have call successors, (4), 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 12:19:05,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:05,208 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2021-05-02 12:19:05,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 12:19:05,209 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.5) internal successors, (15), 9 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2021-05-02 12:19:05,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:05,209 INFO L225 Difference]: With dead ends: 23 [2021-05-02 12:19:05,209 INFO L226 Difference]: Without dead ends: 18 [2021-05-02 12:19:05,210 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 256.7ms TimeCoverageRelationStatistics Valid=53, Invalid=187, Unknown=0, NotChecked=0, Total=240 [2021-05-02 12:19:05,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-05-02 12:19:05,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2021-05-02 12:19:05,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.0769230769230769) internal successors, (14), 13 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 12:19:05,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2021-05-02 12:19:05,214 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2021-05-02 12:19:05,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:05,215 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2021-05-02 12:19:05,215 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 1.5) internal successors, (15), 9 states have internal predecessors, (15), 2 states have call successors, (4), 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 12:19:05,215 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2021-05-02 12:19:05,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 12:19:05,215 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:05,216 INFO L523 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:05,437 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-02 12:19:05,438 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:05,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:05,438 INFO L82 PathProgramCache]: Analyzing trace with hash -1943317092, now seen corresponding path program 6 times [2021-05-02 12:19:05,438 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:05,438 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [575742200] [2021-05-02 12:19:05,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:05,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:05,575 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:05,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:05,587 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:05,587 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:05,587 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [575742200] [2021-05-02 12:19:05,588 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [575742200] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:05,588 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [338189092] [2021-05-02 12:19:05,588 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 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 12:19:05,654 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-02 12:19:05,654 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:05,655 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 12:19:05,657 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:05,727 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:05,733 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:05,751 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:05,785 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:05,786 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [338189092] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:05,786 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:05,786 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11] total 13 [2021-05-02 12:19:05,786 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [48591317] [2021-05-02 12:19:05,786 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 12:19:05,787 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:05,787 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 12:19:05,787 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2021-05-02 12:19:05,787 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand has 13 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 11 states have internal predecessors, (18), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:06,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:06,080 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2021-05-02 12:19:06,080 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 12:19:06,080 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 11 states have internal predecessors, (18), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-02 12:19:06,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:06,081 INFO L225 Difference]: With dead ends: 24 [2021-05-02 12:19:06,081 INFO L226 Difference]: Without dead ends: 19 [2021-05-02 12:19:06,082 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 295.8ms TimeCoverageRelationStatistics Valid=65, Invalid=315, Unknown=0, NotChecked=0, Total=380 [2021-05-02 12:19:06,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-05-02 12:19:06,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-05-02 12:19:06,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.0714285714285714) internal successors, (15), 14 states have internal predecessors, (15), 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 12:19:06,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2021-05-02 12:19:06,086 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2021-05-02 12:19:06,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:06,086 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2021-05-02 12:19:06,086 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 11 states have internal predecessors, (18), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:06,086 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2021-05-02 12:19:06,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 12:19:06,087 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:06,087 INFO L523 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:06,312 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:06,312 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:06,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:06,313 INFO L82 PathProgramCache]: Analyzing trace with hash -76826442, now seen corresponding path program 7 times [2021-05-02 12:19:06,313 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:06,313 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2019023662] [2021-05-02 12:19:06,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:06,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:06,458 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:06,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:06,470 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:06,470 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:06,470 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2019023662] [2021-05-02 12:19:06,470 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2019023662] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:06,471 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1068482983] [2021-05-02 12:19:06,471 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 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 12:19:06,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:06,522 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 12:19:06,525 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:06,590 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:06,600 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:06,601 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1068482983] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:06,601 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:06,601 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2021-05-02 12:19:06,603 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2109079577] [2021-05-02 12:19:06,604 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 12:19:06,604 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:06,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 12:19:06,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-02 12:19:06,605 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand has 12 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 11 states have internal predecessors, (17), 2 states have call successors, (4), 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 12:19:06,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:06,874 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2021-05-02 12:19:06,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 12:19:06,875 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 11 states have internal predecessors, (17), 2 states have call successors, (4), 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 18 [2021-05-02 12:19:06,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:06,876 INFO L225 Difference]: With dead ends: 25 [2021-05-02 12:19:06,876 INFO L226 Difference]: Without dead ends: 20 [2021-05-02 12:19:06,876 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 297.9ms TimeCoverageRelationStatistics Valid=69, Invalid=311, Unknown=0, NotChecked=0, Total=380 [2021-05-02 12:19:06,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-05-02 12:19:06,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-05-02 12:19:06,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 15 states have (on average 1.0666666666666667) internal successors, (16), 15 states have internal predecessors, (16), 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 12:19:06,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2021-05-02 12:19:06,881 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2021-05-02 12:19:06,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:06,881 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2021-05-02 12:19:06,881 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 11 states have internal predecessors, (17), 2 states have call successors, (4), 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 12:19:06,881 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2021-05-02 12:19:06,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-02 12:19:06,882 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:06,882 INFO L523 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:07,105 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 12:19:07,105 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:07,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:07,106 INFO L82 PathProgramCache]: Analyzing trace with hash 1949808860, now seen corresponding path program 8 times [2021-05-02 12:19:07,106 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:07,106 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [195873109] [2021-05-02 12:19:07,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:07,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:07,254 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:07,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:07,263 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 12:19:07,263 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:07,263 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [195873109] [2021-05-02 12:19:07,264 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [195873109] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:07,264 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [148982012] [2021-05-02 12:19:07,264 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 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 12:19:07,323 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:19:07,323 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:07,324 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 12:19:07,325 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:07,379 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:07,391 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 12:19:07,391 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [148982012] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:07,391 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:07,391 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2021-05-02 12:19:07,391 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [522767349] [2021-05-02 12:19:07,392 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 12:19:07,392 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:07,392 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 12:19:07,392 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-02 12:19:07,393 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand has 13 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 12 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 12:19:07,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:07,732 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2021-05-02 12:19:07,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 12:19:07,733 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 12 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 12:19:07,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:07,733 INFO L225 Difference]: With dead ends: 26 [2021-05-02 12:19:07,733 INFO L226 Difference]: Without dead ends: 21 [2021-05-02 12:19:07,734 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 358.0ms TimeCoverageRelationStatistics Valid=77, Invalid=385, Unknown=0, NotChecked=0, Total=462 [2021-05-02 12:19:07,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-05-02 12:19:07,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-05-02 12:19:07,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.0625) internal successors, (17), 16 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:07,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2021-05-02 12:19:07,739 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2021-05-02 12:19:07,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:07,739 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2021-05-02 12:19:07,739 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 12 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 12:19:07,739 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2021-05-02 12:19:07,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 12:19:07,740 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:07,740 INFO L523 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:07,957 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-05-02 12:19:07,957 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:07,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:07,957 INFO L82 PathProgramCache]: Analyzing trace with hash 350993782, now seen corresponding path program 9 times [2021-05-02 12:19:07,957 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:07,958 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1234521352] [2021-05-02 12:19:07,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:07,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:08,125 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:08,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:08,132 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:08,132 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:08,132 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1234521352] [2021-05-02 12:19:08,133 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1234521352] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:08,133 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [239000182] [2021-05-02 12:19:08,133 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 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 12:19:08,266 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-05-02 12:19:08,266 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:08,267 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 12:19:08,268 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:08,325 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:08,332 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:08,333 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [239000182] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:08,333 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:08,333 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2021-05-02 12:19:08,333 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1557170167] [2021-05-02 12:19:08,334 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 12:19:08,334 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:08,334 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 12:19:08,334 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-02 12:19:08,334 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand has 14 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 13 states have internal predecessors, (19), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:08,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:08,748 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2021-05-02 12:19:08,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 12:19:08,748 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 13 states have internal predecessors, (19), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2021-05-02 12:19:08,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:08,751 INFO L225 Difference]: With dead ends: 27 [2021-05-02 12:19:08,751 INFO L226 Difference]: Without dead ends: 22 [2021-05-02 12:19:08,751 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 423.0ms TimeCoverageRelationStatistics Valid=85, Invalid=467, Unknown=0, NotChecked=0, Total=552 [2021-05-02 12:19:08,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-05-02 12:19:08,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-05-02 12:19:08,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.0588235294117647) internal successors, (18), 17 states have internal predecessors, (18), 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 12:19:08,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2021-05-02 12:19:08,760 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2021-05-02 12:19:08,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:08,760 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2021-05-02 12:19:08,761 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 13 states have internal predecessors, (19), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:08,761 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2021-05-02 12:19:08,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 12:19:08,761 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:08,762 INFO L523 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:08,965 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:08,966 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:08,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:08,966 INFO L82 PathProgramCache]: Analyzing trace with hash -1967633380, now seen corresponding path program 10 times [2021-05-02 12:19:08,966 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:08,966 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1386473060] [2021-05-02 12:19:08,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:08,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:09,179 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:09,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:09,184 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:09,184 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:09,184 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1386473060] [2021-05-02 12:19:09,185 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1386473060] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:09,185 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1582920637] [2021-05-02 12:19:09,185 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 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 12:19:09,239 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:19:09,239 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:09,240 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-02 12:19:09,241 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:09,299 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:09,308 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:09,309 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1582920637] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:09,309 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:09,309 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2021-05-02 12:19:09,309 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1149958541] [2021-05-02 12:19:09,310 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 12:19:09,310 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:09,310 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 12:19:09,311 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2021-05-02 12:19:09,311 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand has 15 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 14 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 12:19:09,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:09,723 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2021-05-02 12:19:09,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 12:19:09,723 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 14 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 12:19:09,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:09,724 INFO L225 Difference]: With dead ends: 28 [2021-05-02 12:19:09,724 INFO L226 Difference]: Without dead ends: 23 [2021-05-02 12:19:09,725 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 468.3ms TimeCoverageRelationStatistics Valid=93, Invalid=557, Unknown=0, NotChecked=0, Total=650 [2021-05-02 12:19:09,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-02 12:19:09,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-05-02 12:19:09,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.0555555555555556) internal successors, (19), 18 states have internal predecessors, (19), 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 12:19:09,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2021-05-02 12:19:09,729 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2021-05-02 12:19:09,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:09,729 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2021-05-02 12:19:09,729 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 14 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 12:19:09,729 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2021-05-02 12:19:09,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 12:19:09,730 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:09,730 INFO L523 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:09,943 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:09,943 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:09,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:09,943 INFO L82 PathProgramCache]: Analyzing trace with hash -830631370, now seen corresponding path program 11 times [2021-05-02 12:19:09,943 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:09,944 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [263611138] [2021-05-02 12:19:09,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:09,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:10,132 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:10,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:10,137 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:10,138 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:10,138 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [263611138] [2021-05-02 12:19:10,138 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [263611138] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:10,138 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1258523289] [2021-05-02 12:19:10,138 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 12:19:10,298 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2021-05-02 12:19:10,298 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:10,300 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 32 conjunts are in the unsatisfiable core [2021-05-02 12:19:10,301 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:10,447 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:10,457 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:10,457 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1258523289] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:10,458 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:10,458 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2021-05-02 12:19:10,458 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1120618451] [2021-05-02 12:19:10,458 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 12:19:10,458 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:10,459 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 12:19:10,459 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-05-02 12:19:10,459 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand has 16 states, 16 states have (on average 1.3125) internal successors, (21), 15 states have internal predecessors, (21), 2 states have call successors, (4), 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 12:19:10,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:10,910 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2021-05-02 12:19:10,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 12:19:10,911 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.3125) internal successors, (21), 15 states have internal predecessors, (21), 2 states have call successors, (4), 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 22 [2021-05-02 12:19:10,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:10,911 INFO L225 Difference]: With dead ends: 29 [2021-05-02 12:19:10,911 INFO L226 Difference]: Without dead ends: 24 [2021-05-02 12:19:10,912 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 16 SyntacticMatches, 8 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 592.5ms TimeCoverageRelationStatistics Valid=101, Invalid=655, Unknown=0, NotChecked=0, Total=756 [2021-05-02 12:19:10,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-05-02 12:19:10,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-05-02 12:19:10,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.0526315789473684) internal successors, (20), 19 states have internal predecessors, (20), 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 12:19:10,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2021-05-02 12:19:10,916 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2021-05-02 12:19:10,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:10,916 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2021-05-02 12:19:10,917 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.3125) internal successors, (21), 15 states have internal predecessors, (21), 2 states have call successors, (4), 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 12:19:10,917 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2021-05-02 12:19:10,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 12:19:10,917 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:10,917 INFO L523 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:11,121 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 12:19:11,121 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:11,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:11,121 INFO L82 PathProgramCache]: Analyzing trace with hash 56692572, now seen corresponding path program 12 times [2021-05-02 12:19:11,121 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:11,121 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [891028230] [2021-05-02 12:19:11,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:11,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:11,331 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:11,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:11,344 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:11,345 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:11,345 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [891028230] [2021-05-02 12:19:11,345 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [891028230] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:11,345 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1280153498] [2021-05-02 12:19:11,345 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 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 12:19:11,444 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-05-02 12:19:11,444 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:11,446 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 34 conjunts are in the unsatisfiable core [2021-05-02 12:19:11,447 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:11,527 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:11,527 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1280153498] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:11,527 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:11,527 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2021-05-02 12:19:11,527 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2036261805] [2021-05-02 12:19:11,529 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 12:19:11,529 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:11,529 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 12:19:11,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2021-05-02 12:19:11,529 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand has 17 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 16 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 12:19:12,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:12,068 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2021-05-02 12:19:12,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 12:19:12,068 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 16 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 12:19:12,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:12,070 INFO L225 Difference]: With dead ends: 30 [2021-05-02 12:19:12,070 INFO L226 Difference]: Without dead ends: 25 [2021-05-02 12:19:12,070 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 23 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 579.2ms TimeCoverageRelationStatistics Valid=109, Invalid=761, Unknown=0, NotChecked=0, Total=870 [2021-05-02 12:19:12,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-05-02 12:19:12,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2021-05-02 12:19:12,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.05) internal successors, (21), 20 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 12:19:12,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2021-05-02 12:19:12,087 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2021-05-02 12:19:12,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:12,087 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2021-05-02 12:19:12,087 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 16 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 12:19:12,088 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2021-05-02 12:19:12,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-02 12:19:12,088 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:12,088 INFO L523 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:12,288 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 12:19:12,289 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:12,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:12,289 INFO L82 PathProgramCache]: Analyzing trace with hash 1793930998, now seen corresponding path program 13 times [2021-05-02 12:19:12,289 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:12,289 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2130416642] [2021-05-02 12:19:12,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:12,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:12,536 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:12,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:12,544 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:12,544 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:12,544 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2130416642] [2021-05-02 12:19:12,544 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2130416642] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:12,544 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1983901047] [2021-05-02 12:19:12,544 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 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 12:19:12,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:12,586 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 12:19:12,587 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:12,655 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:12,669 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:12,669 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1983901047] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:12,669 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:12,669 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2021-05-02 12:19:12,670 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [266102515] [2021-05-02 12:19:12,671 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 12:19:12,671 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:12,671 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 12:19:12,671 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2021-05-02 12:19:12,672 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand has 18 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 17 states have internal predecessors, (23), 2 states have call successors, (4), 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 12:19:13,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:13,244 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2021-05-02 12:19:13,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 12:19:13,244 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 17 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 24 [2021-05-02 12:19:13,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:13,245 INFO L225 Difference]: With dead ends: 31 [2021-05-02 12:19:13,245 INFO L226 Difference]: Without dead ends: 26 [2021-05-02 12:19:13,245 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 595.5ms TimeCoverageRelationStatistics Valid=117, Invalid=875, Unknown=0, NotChecked=0, Total=992 [2021-05-02 12:19:13,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-05-02 12:19:13,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-05-02 12:19:13,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 21 states have (on average 1.0476190476190477) internal successors, (22), 21 states have internal predecessors, (22), 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 12:19:13,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2021-05-02 12:19:13,249 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2021-05-02 12:19:13,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:13,250 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2021-05-02 12:19:13,250 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 17 states have internal predecessors, (23), 2 states have call successors, (4), 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 12:19:13,250 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2021-05-02 12:19:13,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-02 12:19:13,251 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:13,251 INFO L523 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:13,467 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-02 12:19:13,467 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:13,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:13,467 INFO L82 PathProgramCache]: Analyzing trace with hash -186252644, now seen corresponding path program 14 times [2021-05-02 12:19:13,468 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:13,468 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1143600840] [2021-05-02 12:19:13,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:13,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:13,696 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:13,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:13,702 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:13,702 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:13,702 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1143600840] [2021-05-02 12:19:13,702 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1143600840] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:13,702 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [37053392] [2021-05-02 12:19:13,702 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 12:19:13,738 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:19:13,738 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:13,739 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-02 12:19:13,740 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:13,808 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:13,815 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:13,816 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [37053392] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:13,816 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:13,816 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2021-05-02 12:19:13,816 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [325726121] [2021-05-02 12:19:13,816 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 12:19:13,816 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:13,817 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 12:19:13,817 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2021-05-02 12:19:13,817 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand has 19 states, 19 states have (on average 1.263157894736842) internal successors, (24), 18 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 12:19:14,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:14,431 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2021-05-02 12:19:14,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 12:19:14,431 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.263157894736842) internal successors, (24), 18 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 12:19:14,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:14,432 INFO L225 Difference]: With dead ends: 32 [2021-05-02 12:19:14,432 INFO L226 Difference]: Without dead ends: 27 [2021-05-02 12:19:14,432 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 619.9ms TimeCoverageRelationStatistics Valid=125, Invalid=997, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 12:19:14,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-02 12:19:14,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-05-02 12:19:14,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 22 states have (on average 1.0454545454545454) internal successors, (23), 22 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 12:19:14,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2021-05-02 12:19:14,435 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2021-05-02 12:19:14,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:14,435 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2021-05-02 12:19:14,435 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.263157894736842) internal successors, (24), 18 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 12:19:14,435 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2021-05-02 12:19:14,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 12:19:14,436 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:14,436 INFO L523 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:14,636 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:14,636 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:14,637 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:14,637 INFO L82 PathProgramCache]: Analyzing trace with hash -1442403402, now seen corresponding path program 15 times [2021-05-02 12:19:14,637 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:14,637 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2136045224] [2021-05-02 12:19:14,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:14,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:14,888 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:14,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:14,903 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:14,903 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:14,903 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2136045224] [2021-05-02 12:19:14,903 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2136045224] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:14,903 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [405448332] [2021-05-02 12:19:14,903 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 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 12:19:15,116 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-05-02 12:19:15,116 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:15,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 39 conjunts are in the unsatisfiable core [2021-05-02 12:19:15,118 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:15,273 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:15,281 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:15,281 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [405448332] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:15,282 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:15,282 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2021-05-02 12:19:15,282 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [623212201] [2021-05-02 12:19:15,282 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 12:19:15,282 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:15,283 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 12:19:15,283 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2021-05-02 12:19:15,283 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand has 20 states, 20 states have (on average 1.25) internal successors, (25), 19 states have internal predecessors, (25), 2 states have call successors, (4), 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 12:19:15,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:15,923 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2021-05-02 12:19:15,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 12:19:15,924 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.25) internal successors, (25), 19 states have internal predecessors, (25), 2 states have call successors, (4), 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 26 [2021-05-02 12:19:15,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:15,924 INFO L225 Difference]: With dead ends: 33 [2021-05-02 12:19:15,924 INFO L226 Difference]: Without dead ends: 28 [2021-05-02 12:19:15,925 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 22 SyntacticMatches, 6 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 134 ImplicationChecksByTransitivity, 736.2ms TimeCoverageRelationStatistics Valid=133, Invalid=1127, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 12:19:15,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-05-02 12:19:15,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-05-02 12:19:15,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.0434782608695652) internal successors, (24), 23 states have internal predecessors, (24), 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 12:19:15,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2021-05-02 12:19:15,928 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2021-05-02 12:19:15,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:15,928 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2021-05-02 12:19:15,929 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 1.25) internal successors, (25), 19 states have internal predecessors, (25), 2 states have call successors, (4), 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 12:19:15,929 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2021-05-02 12:19:15,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 12:19:15,929 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:15,929 INFO L523 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:16,130 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 12:19:16,130 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:16,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:16,130 INFO L82 PathProgramCache]: Analyzing trace with hash -1728371236, now seen corresponding path program 16 times [2021-05-02 12:19:16,130 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:16,130 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1388085286] [2021-05-02 12:19:16,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:16,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:16,397 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:16,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:16,412 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:16,412 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:16,412 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1388085286] [2021-05-02 12:19:16,412 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1388085286] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:16,412 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [875490238] [2021-05-02 12:19:16,412 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 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 12:19:16,445 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:19:16,445 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:16,446 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 35 conjunts are in the unsatisfiable core [2021-05-02 12:19:16,449 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:16,530 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:16,536 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:16,536 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [875490238] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:16,537 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:16,537 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2021-05-02 12:19:16,537 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [638155882] [2021-05-02 12:19:16,537 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 12:19:16,537 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:16,537 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 12:19:16,538 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2021-05-02 12:19:16,538 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand has 21 states, 21 states have (on average 1.2380952380952381) internal successors, (26), 20 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 12:19:17,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:17,222 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2021-05-02 12:19:17,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 12:19:17,223 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.2380952380952381) internal successors, (26), 20 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 12:19:17,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:17,223 INFO L225 Difference]: With dead ends: 34 [2021-05-02 12:19:17,223 INFO L226 Difference]: Without dead ends: 29 [2021-05-02 12:19:17,224 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 723.8ms TimeCoverageRelationStatistics Valid=141, Invalid=1265, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 12:19:17,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-02 12:19:17,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2021-05-02 12:19:17,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 24 states have (on average 1.0416666666666667) internal successors, (25), 24 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 12:19:17,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2021-05-02 12:19:17,228 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2021-05-02 12:19:17,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:17,229 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2021-05-02 12:19:17,229 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.2380952380952381) internal successors, (26), 20 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 12:19:17,229 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2021-05-02 12:19:17,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-02 12:19:17,229 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:17,229 INFO L523 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:17,454 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:17,454 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:17,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:17,455 INFO L82 PathProgramCache]: Analyzing trace with hash -2003439498, now seen corresponding path program 17 times [2021-05-02 12:19:17,455 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:17,455 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2001776745] [2021-05-02 12:19:17,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:17,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:17,765 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:17,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:17,774 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:17,775 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:17,775 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2001776745] [2021-05-02 12:19:17,775 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2001776745] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:17,775 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1201252994] [2021-05-02 12:19:17,775 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 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 12:19:17,975 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-05-02 12:19:17,975 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:17,976 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 53 conjunts are in the unsatisfiable core [2021-05-02 12:19:17,977 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:18,284 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:18,291 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:18,292 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1201252994] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:18,292 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:18,292 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2021-05-02 12:19:18,292 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1877778314] [2021-05-02 12:19:18,293 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 12:19:18,293 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:18,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 12:19:18,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2021-05-02 12:19:18,294 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand has 22 states, 22 states have (on average 1.2272727272727273) internal successors, (27), 21 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:19,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:19,028 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2021-05-02 12:19:19,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-02 12:19:19,029 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.2272727272727273) internal successors, (27), 21 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 28 [2021-05-02 12:19:19,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:19,029 INFO L225 Difference]: With dead ends: 35 [2021-05-02 12:19:19,029 INFO L226 Difference]: Without dead ends: 30 [2021-05-02 12:19:19,030 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 14 SyntacticMatches, 16 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 187 ImplicationChecksByTransitivity, 1029.1ms TimeCoverageRelationStatistics Valid=149, Invalid=1411, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 12:19:19,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-02 12:19:19,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-05-02 12:19:19,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 25 states have (on average 1.04) internal successors, (26), 25 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 12:19:19,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2021-05-02 12:19:19,033 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2021-05-02 12:19:19,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:19,033 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2021-05-02 12:19:19,033 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 1.2272727272727273) internal successors, (27), 21 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:19,034 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2021-05-02 12:19:19,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 12:19:19,034 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:19,034 INFO L523 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:19,237 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:19,237 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:19,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:19,237 INFO L82 PathProgramCache]: Analyzing trace with hash -1940621028, now seen corresponding path program 18 times [2021-05-02 12:19:19,237 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:19,238 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [227236248] [2021-05-02 12:19:19,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:19,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:19,543 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:19,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:19,555 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:19,555 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:19,556 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [227236248] [2021-05-02 12:19:19,556 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [227236248] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:19,556 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1857416262] [2021-05-02 12:19:19,556 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 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 12:19:19,771 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2021-05-02 12:19:19,772 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:19,773 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 39 conjunts are in the unsatisfiable core [2021-05-02 12:19:19,774 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:19,849 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:19,856 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:19,857 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1857416262] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:19,857 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:19,857 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2021-05-02 12:19:19,857 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [92312357] [2021-05-02 12:19:19,857 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 12:19:19,857 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:19,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 12:19:19,858 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2021-05-02 12:19:19,858 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand has 23 states, 23 states have (on average 1.2173913043478262) internal successors, (28), 22 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 12:19:20,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:20,603 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2021-05-02 12:19:20,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 12:19:20,604 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.2173913043478262) internal successors, (28), 22 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 12:19:20,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:20,604 INFO L225 Difference]: With dead ends: 36 [2021-05-02 12:19:20,604 INFO L226 Difference]: Without dead ends: 31 [2021-05-02 12:19:20,605 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 175 ImplicationChecksByTransitivity, 795.2ms TimeCoverageRelationStatistics Valid=157, Invalid=1565, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 12:19:20,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-05-02 12:19:20,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2021-05-02 12:19:20,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.0384615384615385) internal successors, (27), 26 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 12:19:20,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2021-05-02 12:19:20,608 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2021-05-02 12:19:20,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:20,609 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2021-05-02 12:19:20,609 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.2173913043478262) internal successors, (28), 22 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 12:19:20,609 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2021-05-02 12:19:20,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-02 12:19:20,609 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:20,609 INFO L523 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:20,813 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-05-02 12:19:20,813 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:20,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:20,813 INFO L82 PathProgramCache]: Analyzing trace with hash 6751542, now seen corresponding path program 19 times [2021-05-02 12:19:20,813 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:20,813 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1467709869] [2021-05-02 12:19:20,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:20,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:21,157 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:21,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:21,160 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:21,160 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:21,161 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1467709869] [2021-05-02 12:19:21,161 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1467709869] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:21,161 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1212076841] [2021-05-02 12:19:21,161 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 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 12:19:21,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:21,234 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 41 conjunts are in the unsatisfiable core [2021-05-02 12:19:21,235 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:21,313 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:21,322 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:21,323 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1212076841] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:21,323 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:21,323 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 24 [2021-05-02 12:19:21,323 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1898605371] [2021-05-02 12:19:21,325 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 12:19:21,325 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:21,326 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 12:19:21,326 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2021-05-02 12:19:21,326 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand has 24 states, 24 states have (on average 1.2083333333333333) internal successors, (29), 23 states have internal predecessors, (29), 2 states have call successors, (4), 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 12:19:22,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:22,159 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2021-05-02 12:19:22,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-02 12:19:22,159 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.2083333333333333) internal successors, (29), 23 states have internal predecessors, (29), 2 states have call successors, (4), 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 30 [2021-05-02 12:19:22,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:22,160 INFO L225 Difference]: With dead ends: 37 [2021-05-02 12:19:22,160 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 12:19:22,161 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 194 ImplicationChecksByTransitivity, 874.7ms TimeCoverageRelationStatistics Valid=165, Invalid=1727, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 12:19:22,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 12:19:22,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-05-02 12:19:22,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.037037037037037) internal successors, (28), 27 states have internal predecessors, (28), 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 12:19:22,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2021-05-02 12:19:22,164 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2021-05-02 12:19:22,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:22,164 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2021-05-02 12:19:22,164 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.2083333333333333) internal successors, (29), 23 states have internal predecessors, (29), 2 states have call successors, (4), 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 12:19:22,164 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2021-05-02 12:19:22,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 12:19:22,165 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:22,165 INFO L523 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:22,376 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:22,377 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:22,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:22,377 INFO L82 PathProgramCache]: Analyzing trace with hash 245759068, now seen corresponding path program 20 times [2021-05-02 12:19:22,377 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:22,377 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1700326684] [2021-05-02 12:19:22,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:22,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:22,781 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:22,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:22,785 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:22,785 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:22,785 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1700326684] [2021-05-02 12:19:22,785 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1700326684] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:22,785 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [168830744] [2021-05-02 12:19:22,786 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 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 12:19:22,837 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:19:22,838 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:22,839 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 43 conjunts are in the unsatisfiable core [2021-05-02 12:19:22,843 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:22,938 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:22,945 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:22,945 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [168830744] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:22,946 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:22,946 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2021-05-02 12:19:22,946 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [548124809] [2021-05-02 12:19:22,946 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 12:19:22,946 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:22,946 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 12:19:22,947 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2021-05-02 12:19:22,947 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand has 25 states, 25 states have (on average 1.2) internal successors, (30), 24 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 12:19:23,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:23,885 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2021-05-02 12:19:23,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 12:19:23,887 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.2) internal successors, (30), 24 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 12:19:23,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:23,887 INFO L225 Difference]: With dead ends: 38 [2021-05-02 12:19:23,887 INFO L226 Difference]: Without dead ends: 33 [2021-05-02 12:19:23,888 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 214 ImplicationChecksByTransitivity, 1053.8ms TimeCoverageRelationStatistics Valid=173, Invalid=1897, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 12:19:23,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-02 12:19:23,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-05-02 12:19:23,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 28 states have (on average 1.0357142857142858) internal successors, (29), 28 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 12:19:23,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2021-05-02 12:19:23,891 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2021-05-02 12:19:23,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:23,891 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2021-05-02 12:19:23,891 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 1.2) internal successors, (30), 24 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 12:19:23,891 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2021-05-02 12:19:23,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 12:19:23,892 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:23,892 INFO L523 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:24,100 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-02 12:19:24,101 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:24,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:24,101 INFO L82 PathProgramCache]: Analyzing trace with hash -934942218, now seen corresponding path program 21 times [2021-05-02 12:19:24,101 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:24,101 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [607913163] [2021-05-02 12:19:24,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:24,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:24,492 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:24,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:24,496 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:24,496 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:24,496 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [607913163] [2021-05-02 12:19:24,496 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [607913163] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:24,496 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [648831984] [2021-05-02 12:19:24,496 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 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 12:19:24,737 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2021-05-02 12:19:24,738 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:24,739 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 50 conjunts are in the unsatisfiable core [2021-05-02 12:19:24,740 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:24,821 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:24,822 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:24,824 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:24,869 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:24,869 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [648831984] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:24,869 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:24,870 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 26] total 28 [2021-05-02 12:19:24,870 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1464948119] [2021-05-02 12:19:24,870 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 12:19:24,870 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:24,870 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 12:19:24,871 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=681, Unknown=0, NotChecked=0, Total=756 [2021-05-02 12:19:24,871 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand has 28 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 26 states have internal predecessors, (33), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:25,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:25,874 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2021-05-02 12:19:25,889 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-02 12:19:25,889 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 26 states have internal predecessors, (33), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2021-05-02 12:19:25,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:25,889 INFO L225 Difference]: With dead ends: 39 [2021-05-02 12:19:25,890 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 12:19:25,890 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 239 ImplicationChecksByTransitivity, 1075.8ms TimeCoverageRelationStatistics Valid=185, Invalid=2265, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 12:19:25,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 12:19:25,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-05-02 12:19:25,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.0344827586206897) internal successors, (30), 29 states have internal predecessors, (30), 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 12:19:25,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2021-05-02 12:19:25,894 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2021-05-02 12:19:25,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:25,894 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2021-05-02 12:19:25,894 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 26 states have internal predecessors, (33), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:25,894 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2021-05-02 12:19:25,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-02 12:19:25,908 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:25,908 INFO L523 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:26,111 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-05-02 12:19:26,112 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:26,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:26,112 INFO L82 PathProgramCache]: Analyzing trace with hash 1118023580, now seen corresponding path program 22 times [2021-05-02 12:19:26,112 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:26,112 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [746244051] [2021-05-02 12:19:26,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:26,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:26,485 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:26,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:26,501 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:26,501 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:26,501 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [746244051] [2021-05-02 12:19:26,501 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [746244051] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:26,501 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [338981181] [2021-05-02 12:19:26,502 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 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 12:19:26,538 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:19:26,538 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:26,539 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 47 conjunts are in the unsatisfiable core [2021-05-02 12:19:26,539 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:26,620 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:26,628 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:26,628 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [338981181] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:26,628 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:26,628 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25] total 27 [2021-05-02 12:19:26,628 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1185345970] [2021-05-02 12:19:26,628 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-02 12:19:26,628 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:26,629 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-02 12:19:26,629 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2021-05-02 12:19:26,629 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand has 27 states, 27 states have (on average 1.1851851851851851) internal successors, (32), 26 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 12:19:27,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:27,510 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2021-05-02 12:19:27,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 12:19:27,510 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.1851851851851851) internal successors, (32), 26 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 12:19:27,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:27,511 INFO L225 Difference]: With dead ends: 40 [2021-05-02 12:19:27,511 INFO L226 Difference]: Without dead ends: 35 [2021-05-02 12:19:27,511 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 257 ImplicationChecksByTransitivity, 996.1ms TimeCoverageRelationStatistics Valid=189, Invalid=2261, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 12:19:27,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-02 12:19:27,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2021-05-02 12:19:27,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 30 states have (on average 1.0333333333333334) internal successors, (31), 30 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 12:19:27,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2021-05-02 12:19:27,515 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2021-05-02 12:19:27,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:27,515 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2021-05-02 12:19:27,515 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 1.1851851851851851) internal successors, (32), 26 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 12:19:27,515 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2021-05-02 12:19:27,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-02 12:19:27,515 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:27,515 INFO L523 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:27,716 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:27,717 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:27,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:27,717 INFO L82 PathProgramCache]: Analyzing trace with hash 335453878, now seen corresponding path program 23 times [2021-05-02 12:19:27,717 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:27,717 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1222311638] [2021-05-02 12:19:27,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:27,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:28,132 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:28,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:28,141 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:28,141 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:28,141 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1222311638] [2021-05-02 12:19:28,141 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1222311638] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:28,142 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1784607868] [2021-05-02 12:19:28,142 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 12:19:29,301 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 13 check-sat command(s) [2021-05-02 12:19:29,302 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:29,304 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 71 conjunts are in the unsatisfiable core [2021-05-02 12:19:29,305 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:29,675 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:29,681 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:29,682 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1784607868] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:29,682 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:29,682 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 28 [2021-05-02 12:19:29,682 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [100974363] [2021-05-02 12:19:29,682 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 12:19:29,682 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:29,682 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 12:19:29,682 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2021-05-02 12:19:29,682 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand has 28 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 27 states have internal predecessors, (33), 2 states have call successors, (4), 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 12:19:30,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:30,694 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2021-05-02 12:19:30,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 12:19:30,694 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 27 states have internal predecessors, (33), 2 states have call successors, (4), 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 34 [2021-05-02 12:19:30,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:30,695 INFO L225 Difference]: With dead ends: 41 [2021-05-02 12:19:30,695 INFO L226 Difference]: Without dead ends: 36 [2021-05-02 12:19:30,695 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 14 SyntacticMatches, 22 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 322 ImplicationChecksByTransitivity, 1355.6ms TimeCoverageRelationStatistics Valid=197, Invalid=2455, Unknown=0, NotChecked=0, Total=2652 [2021-05-02 12:19:30,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-05-02 12:19:30,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-05-02 12:19:30,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 31 states have (on average 1.032258064516129) internal successors, (32), 31 states have internal predecessors, (32), 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 12:19:30,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2021-05-02 12:19:30,698 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2021-05-02 12:19:30,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:30,698 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2021-05-02 12:19:30,698 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 27 states have internal predecessors, (33), 2 states have call successors, (4), 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 12:19:30,698 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2021-05-02 12:19:30,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 12:19:30,699 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:30,699 INFO L523 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:30,899 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-05-02 12:19:30,899 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:30,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:30,900 INFO L82 PathProgramCache]: Analyzing trace with hash 1845596892, now seen corresponding path program 24 times [2021-05-02 12:19:30,900 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:30,900 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [29047487] [2021-05-02 12:19:30,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:30,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:31,307 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:31,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:31,317 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:31,317 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:31,317 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [29047487] [2021-05-02 12:19:31,318 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [29047487] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:31,318 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1513346604] [2021-05-02 12:19:31,318 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 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 12:19:31,791 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-05-02 12:19:31,792 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:31,793 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 63 conjunts are in the unsatisfiable core [2021-05-02 12:19:31,794 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:32,054 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:32,061 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:32,062 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1513346604] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:32,062 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:32,062 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27] total 29 [2021-05-02 12:19:32,062 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [669863963] [2021-05-02 12:19:32,062 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-02 12:19:32,062 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:32,063 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-02 12:19:32,063 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2021-05-02 12:19:32,063 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand has 29 states, 29 states have (on average 1.1724137931034482) internal successors, (34), 28 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 12:19:33,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:33,148 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2021-05-02 12:19:33,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-02 12:19:33,149 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.1724137931034482) internal successors, (34), 28 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 12:19:33,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:33,149 INFO L225 Difference]: With dead ends: 42 [2021-05-02 12:19:33,149 INFO L226 Difference]: Without dead ends: 37 [2021-05-02 12:19:33,150 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 25 SyntacticMatches, 12 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 326 ImplicationChecksByTransitivity, 1288.7ms TimeCoverageRelationStatistics Valid=205, Invalid=2657, Unknown=0, NotChecked=0, Total=2862 [2021-05-02 12:19:33,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-05-02 12:19:33,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2021-05-02 12:19:33,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 32 states have (on average 1.03125) internal successors, (33), 32 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 12:19:33,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2021-05-02 12:19:33,152 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2021-05-02 12:19:33,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:33,153 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2021-05-02 12:19:33,153 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 1.1724137931034482) internal successors, (34), 28 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 12:19:33,153 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2021-05-02 12:19:33,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 12:19:33,153 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:33,153 INFO L523 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:33,357 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:33,358 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:33,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:33,361 INFO L82 PathProgramCache]: Analyzing trace with hash 1415390070, now seen corresponding path program 25 times [2021-05-02 12:19:33,361 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:33,361 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2080663805] [2021-05-02 12:19:33,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:33,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:34,156 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:34,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:34,160 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:34,160 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:34,167 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2080663805] [2021-05-02 12:19:34,168 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2080663805] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:34,168 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1490569701] [2021-05-02 12:19:34,168 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 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 12:19:34,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:34,234 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 53 conjunts are in the unsatisfiable core [2021-05-02 12:19:34,235 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:34,326 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:34,333 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:34,333 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1490569701] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:34,333 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:34,333 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 30 [2021-05-02 12:19:34,333 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2092745739] [2021-05-02 12:19:34,334 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-02 12:19:34,334 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:34,334 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-02 12:19:34,334 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2021-05-02 12:19:34,334 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand has 30 states, 30 states have (on average 1.1666666666666667) internal successors, (35), 29 states have internal predecessors, (35), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:35,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:35,500 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2021-05-02 12:19:35,500 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-02 12:19:35,500 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.1666666666666667) internal successors, (35), 29 states have internal predecessors, (35), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 36 [2021-05-02 12:19:35,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:35,501 INFO L225 Difference]: With dead ends: 43 [2021-05-02 12:19:35,501 INFO L226 Difference]: Without dead ends: 38 [2021-05-02 12:19:35,501 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 329 ImplicationChecksByTransitivity, 1584.4ms TimeCoverageRelationStatistics Valid=213, Invalid=2867, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 12:19:35,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-02 12:19:35,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2021-05-02 12:19:35,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 33 states have (on average 1.0303030303030303) internal successors, (34), 33 states have internal predecessors, (34), 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 12:19:35,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2021-05-02 12:19:35,504 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2021-05-02 12:19:35,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:35,504 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2021-05-02 12:19:35,504 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 1.1666666666666667) internal successors, (35), 29 states have internal predecessors, (35), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:35,504 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2021-05-02 12:19:35,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-02 12:19:35,505 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:35,505 INFO L523 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:35,705 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-02 12:19:35,705 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:35,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:35,706 INFO L82 PathProgramCache]: Analyzing trace with hash 963880476, now seen corresponding path program 26 times [2021-05-02 12:19:35,706 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:35,706 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [521768888] [2021-05-02 12:19:35,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:35,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:36,169 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:36,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:36,178 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:36,178 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:36,178 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [521768888] [2021-05-02 12:19:36,178 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [521768888] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:36,178 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1138724953] [2021-05-02 12:19:36,178 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 12:19:36,214 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:19:36,214 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:36,215 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 55 conjunts are in the unsatisfiable core [2021-05-02 12:19:36,216 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:36,295 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:36,309 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:36,309 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1138724953] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:36,309 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:36,309 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29] total 31 [2021-05-02 12:19:36,309 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [244778602] [2021-05-02 12:19:36,310 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-02 12:19:36,310 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:36,310 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-02 12:19:36,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2021-05-02 12:19:36,310 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand has 31 states, 31 states have (on average 1.1612903225806452) internal successors, (36), 30 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 12:19:37,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:37,512 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2021-05-02 12:19:37,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-02 12:19:37,513 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.1612903225806452) internal successors, (36), 30 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 12:19:37,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:37,513 INFO L225 Difference]: With dead ends: 44 [2021-05-02 12:19:37,513 INFO L226 Difference]: Without dead ends: 39 [2021-05-02 12:19:37,514 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 355 ImplicationChecksByTransitivity, 1272.6ms TimeCoverageRelationStatistics Valid=221, Invalid=3085, Unknown=0, NotChecked=0, Total=3306 [2021-05-02 12:19:37,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-05-02 12:19:37,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2021-05-02 12:19:37,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 34 states have (on average 1.0294117647058822) internal successors, (35), 34 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 12:19:37,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2021-05-02 12:19:37,516 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2021-05-02 12:19:37,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:37,517 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2021-05-02 12:19:37,517 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 1.1612903225806452) internal successors, (36), 30 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 12:19:37,517 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2021-05-02 12:19:37,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 12:19:37,517 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:37,517 INFO L523 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:37,717 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,27 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:37,718 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:37,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:37,718 INFO L82 PathProgramCache]: Analyzing trace with hash -148015050, now seen corresponding path program 27 times [2021-05-02 12:19:37,718 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:37,718 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [337172921] [2021-05-02 12:19:37,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:37,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:38,298 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:38,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:38,301 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:38,301 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:38,302 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [337172921] [2021-05-02 12:19:38,302 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [337172921] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:38,302 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [100639563] [2021-05-02 12:19:38,302 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 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 12:19:38,689 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2021-05-02 12:19:38,689 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:38,691 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 58 conjunts are in the unsatisfiable core [2021-05-02 12:19:38,691 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:38,791 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:38,796 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:38,796 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [100639563] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:38,797 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:38,797 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 32 [2021-05-02 12:19:38,797 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1182108241] [2021-05-02 12:19:38,797 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-02 12:19:38,797 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:38,797 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-02 12:19:38,797 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2021-05-02 12:19:38,798 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand has 32 states, 32 states have (on average 1.15625) internal successors, (37), 31 states have internal predecessors, (37), 2 states have call successors, (4), 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 12:19:40,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:40,073 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2021-05-02 12:19:40,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-02 12:19:40,073 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.15625) internal successors, (37), 31 states have internal predecessors, (37), 2 states have call successors, (4), 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 38 [2021-05-02 12:19:40,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:40,074 INFO L225 Difference]: With dead ends: 45 [2021-05-02 12:19:40,074 INFO L226 Difference]: Without dead ends: 40 [2021-05-02 12:19:40,075 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 382 ImplicationChecksByTransitivity, 1439.8ms TimeCoverageRelationStatistics Valid=229, Invalid=3311, Unknown=0, NotChecked=0, Total=3540 [2021-05-02 12:19:40,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-05-02 12:19:40,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2021-05-02 12:19:40,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 35 states have (on average 1.0285714285714285) internal successors, (36), 35 states have internal predecessors, (36), 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 12:19:40,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2021-05-02 12:19:40,078 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2021-05-02 12:19:40,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:40,078 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2021-05-02 12:19:40,078 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 1.15625) internal successors, (37), 31 states have internal predecessors, (37), 2 states have call successors, (4), 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 12:19:40,078 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2021-05-02 12:19:40,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 12:19:40,078 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:40,078 INFO L523 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:40,281 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-05-02 12:19:40,282 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:40,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:40,282 INFO L82 PathProgramCache]: Analyzing trace with hash -257037988, now seen corresponding path program 28 times [2021-05-02 12:19:40,282 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:40,282 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1763945075] [2021-05-02 12:19:40,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:40,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:40,819 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:40,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:40,827 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:40,827 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:40,827 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1763945075] [2021-05-02 12:19:40,827 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1763945075] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:40,828 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1632830719] [2021-05-02 12:19:40,828 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 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 12:19:40,871 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:19:40,871 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:40,872 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 59 conjunts are in the unsatisfiable core [2021-05-02 12:19:40,873 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:40,966 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:40,975 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:40,976 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1632830719] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:40,976 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:40,976 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31] total 33 [2021-05-02 12:19:40,977 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1342287210] [2021-05-02 12:19:40,977 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-02 12:19:40,978 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:40,978 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-02 12:19:40,978 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=964, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 12:19:40,984 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand has 33 states, 33 states have (on average 1.1515151515151516) internal successors, (38), 32 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 12:19:42,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:42,355 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2021-05-02 12:19:42,355 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-02 12:19:42,356 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.1515151515151516) internal successors, (38), 32 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 12:19:42,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:42,357 INFO L225 Difference]: With dead ends: 46 [2021-05-02 12:19:42,357 INFO L226 Difference]: Without dead ends: 41 [2021-05-02 12:19:42,357 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 410 ImplicationChecksByTransitivity, 1459.5ms TimeCoverageRelationStatistics Valid=237, Invalid=3545, Unknown=0, NotChecked=0, Total=3782 [2021-05-02 12:19:42,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-05-02 12:19:42,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2021-05-02 12:19:42,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 36 states have (on average 1.0277777777777777) internal successors, (37), 36 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 12:19:42,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2021-05-02 12:19:42,361 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2021-05-02 12:19:42,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:42,361 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2021-05-02 12:19:42,361 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 1.1515151515151516) internal successors, (38), 32 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 12:19:42,361 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2021-05-02 12:19:42,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-02 12:19:42,362 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:42,362 INFO L523 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:42,564 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:42,565 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:42,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:42,565 INFO L82 PathProgramCache]: Analyzing trace with hash 658218230, now seen corresponding path program 29 times [2021-05-02 12:19:42,565 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:42,565 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1386216747] [2021-05-02 12:19:42,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:42,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:43,259 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:43,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:43,262 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:43,263 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:43,263 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1386216747] [2021-05-02 12:19:43,263 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1386216747] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:43,263 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1620447864] [2021-05-02 12:19:43,263 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 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 12:19:46,280 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 16 check-sat command(s) [2021-05-02 12:19:46,281 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:46,284 WARN L261 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 90 conjunts are in the unsatisfiable core [2021-05-02 12:19:46,285 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:46,865 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:46,871 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:46,871 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1620447864] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:46,871 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:46,871 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32] total 34 [2021-05-02 12:19:46,871 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [981811980] [2021-05-02 12:19:46,871 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-02 12:19:46,871 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:46,872 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-02 12:19:46,872 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1027, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 12:19:46,872 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand has 34 states, 34 states have (on average 1.1470588235294117) internal successors, (39), 33 states have internal predecessors, (39), 2 states have call successors, (4), 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 12:19:48,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:48,282 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2021-05-02 12:19:48,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-02 12:19:48,283 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.1470588235294117) internal successors, (39), 33 states have internal predecessors, (39), 2 states have call successors, (4), 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 40 [2021-05-02 12:19:48,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:48,283 INFO L225 Difference]: With dead ends: 47 [2021-05-02 12:19:48,283 INFO L226 Difference]: Without dead ends: 42 [2021-05-02 12:19:48,284 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 14 SyntacticMatches, 28 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 493 ImplicationChecksByTransitivity, 2139.0ms TimeCoverageRelationStatistics Valid=245, Invalid=3787, Unknown=0, NotChecked=0, Total=4032 [2021-05-02 12:19:48,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-02 12:19:48,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2021-05-02 12:19:48,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 37 states have (on average 1.027027027027027) internal successors, (38), 37 states have internal predecessors, (38), 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 12:19:48,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2021-05-02 12:19:48,288 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2021-05-02 12:19:48,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:48,288 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2021-05-02 12:19:48,288 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 1.1470588235294117) internal successors, (39), 33 states have internal predecessors, (39), 2 states have call successors, (4), 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 12:19:48,288 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2021-05-02 12:19:48,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 12:19:48,289 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:48,289 INFO L523 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:48,492 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-05-02 12:19:48,493 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:48,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:48,493 INFO L82 PathProgramCache]: Analyzing trace with hash -1033610084, now seen corresponding path program 30 times [2021-05-02 12:19:48,493 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:48,493 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [268875624] [2021-05-02 12:19:48,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:48,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:49,071 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:49,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:49,089 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:49,089 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:49,089 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [268875624] [2021-05-02 12:19:49,090 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [268875624] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:49,090 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1968338400] [2021-05-02 12:19:49,090 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 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 12:19:49,593 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 16 check-sat command(s) [2021-05-02 12:19:49,593 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:49,596 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 70 conjunts are in the unsatisfiable core [2021-05-02 12:19:49,597 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:49,711 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:49,711 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1968338400] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:49,711 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:49,711 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33] total 35 [2021-05-02 12:19:49,711 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1179972803] [2021-05-02 12:19:49,712 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-02 12:19:49,712 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:49,712 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-02 12:19:49,712 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 12:19:49,712 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand has 35 states, 35 states have (on average 1.1428571428571428) internal successors, (40), 34 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 12:19:51,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:51,141 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2021-05-02 12:19:51,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-02 12:19:51,141 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.1428571428571428) internal successors, (40), 34 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 12:19:51,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:51,142 INFO L225 Difference]: With dead ends: 48 [2021-05-02 12:19:51,142 INFO L226 Difference]: Without dead ends: 43 [2021-05-02 12:19:51,143 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 469 ImplicationChecksByTransitivity, 1577.1ms TimeCoverageRelationStatistics Valid=253, Invalid=4037, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 12:19:51,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-05-02 12:19:51,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2021-05-02 12:19:51,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 38 states have (on average 1.0263157894736843) internal successors, (39), 38 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 12:19:51,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2021-05-02 12:19:51,146 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2021-05-02 12:19:51,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:51,146 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2021-05-02 12:19:51,146 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 1.1428571428571428) internal successors, (40), 34 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 12:19:51,146 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2021-05-02 12:19:51,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-02 12:19:51,146 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:51,146 INFO L523 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:51,347 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:51,347 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:51,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:51,347 INFO L82 PathProgramCache]: Analyzing trace with hash -1940680266, now seen corresponding path program 31 times [2021-05-02 12:19:51,347 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:51,347 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1404235686] [2021-05-02 12:19:51,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:51,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:51,948 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:51,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:51,961 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:51,961 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:51,962 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1404235686] [2021-05-02 12:19:51,962 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1404235686] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:51,962 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1014070567] [2021-05-02 12:19:51,962 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 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 12:19:52,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:52,019 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 65 conjunts are in the unsatisfiable core [2021-05-02 12:19:52,020 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:52,113 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:52,119 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:52,119 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1014070567] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:52,119 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:52,119 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34] total 36 [2021-05-02 12:19:52,119 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1586736270] [2021-05-02 12:19:52,120 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-02 12:19:52,120 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:52,120 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-02 12:19:52,121 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1159, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 12:19:52,121 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand has 36 states, 36 states have (on average 1.1388888888888888) internal successors, (41), 35 states have internal predecessors, (41), 2 states have call successors, (4), 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 12:19:53,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:53,778 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2021-05-02 12:19:53,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 12:19:53,779 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.1388888888888888) internal successors, (41), 35 states have internal predecessors, (41), 2 states have call successors, (4), 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 42 [2021-05-02 12:19:53,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:53,779 INFO L225 Difference]: With dead ends: 49 [2021-05-02 12:19:53,779 INFO L226 Difference]: Without dead ends: 44 [2021-05-02 12:19:53,780 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 500 ImplicationChecksByTransitivity, 1744.7ms TimeCoverageRelationStatistics Valid=261, Invalid=4295, Unknown=0, NotChecked=0, Total=4556 [2021-05-02 12:19:53,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-05-02 12:19:53,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2021-05-02 12:19:53,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 39 states have (on average 1.0256410256410255) internal successors, (40), 39 states have internal predecessors, (40), 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 12:19:53,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2021-05-02 12:19:53,783 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2021-05-02 12:19:53,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:53,783 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2021-05-02 12:19:53,783 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 1.1388888888888888) internal successors, (41), 35 states have internal predecessors, (41), 2 states have call successors, (4), 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 12:19:53,783 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2021-05-02 12:19:53,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 12:19:53,783 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:53,783 INFO L523 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:53,984 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-05-02 12:19:53,984 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:53,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:53,984 INFO L82 PathProgramCache]: Analyzing trace with hash 4915164, now seen corresponding path program 32 times [2021-05-02 12:19:53,984 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:53,984 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1797783915] [2021-05-02 12:19:53,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:53,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:54,636 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:54,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:54,641 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:54,641 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:54,641 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1797783915] [2021-05-02 12:19:54,641 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1797783915] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:54,641 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [894478539] [2021-05-02 12:19:54,641 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 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 12:19:54,678 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:19:54,678 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:54,679 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 67 conjunts are in the unsatisfiable core [2021-05-02 12:19:54,680 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:54,771 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:54,779 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:54,779 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [894478539] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:54,779 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:54,779 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35] total 37 [2021-05-02 12:19:54,779 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1466766667] [2021-05-02 12:19:54,779 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-02 12:19:54,779 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:54,780 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-02 12:19:54,780 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1228, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 12:19:54,780 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand has 37 states, 37 states have (on average 1.135135135135135) internal successors, (42), 36 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 12:19:56,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:56,389 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2021-05-02 12:19:56,390 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-02 12:19:56,390 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.135135135135135) internal successors, (42), 36 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 12:19:56,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:56,390 INFO L225 Difference]: With dead ends: 50 [2021-05-02 12:19:56,390 INFO L226 Difference]: Without dead ends: 45 [2021-05-02 12:19:56,391 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 44 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 532 ImplicationChecksByTransitivity, 1705.1ms TimeCoverageRelationStatistics Valid=269, Invalid=4561, Unknown=0, NotChecked=0, Total=4830 [2021-05-02 12:19:56,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-02 12:19:56,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2021-05-02 12:19:56,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 40 states have (on average 1.025) internal successors, (41), 40 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 12:19:56,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2021-05-02 12:19:56,393 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2021-05-02 12:19:56,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:56,394 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2021-05-02 12:19:56,394 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 1.135135135135135) internal successors, (42), 36 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 12:19:56,394 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2021-05-02 12:19:56,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-02 12:19:56,394 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:56,394 INFO L523 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:56,612 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-05-02 12:19:56,613 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:56,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:56,613 INFO L82 PathProgramCache]: Analyzing trace with hash 188831350, now seen corresponding path program 33 times [2021-05-02 12:19:56,613 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:56,614 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1037668863] [2021-05-02 12:19:56,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:56,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:57,419 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:57,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:57,437 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:57,437 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:57,438 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1037668863] [2021-05-02 12:19:57,438 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1037668863] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:57,438 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [984587792] [2021-05-02 12:19:57,438 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 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 12:19:58,065 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2021-05-02 12:19:58,065 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:58,067 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 70 conjunts are in the unsatisfiable core [2021-05-02 12:19:58,067 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:58,192 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:58,199 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:58,199 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [984587792] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:58,199 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:58,199 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36] total 38 [2021-05-02 12:19:58,199 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1473051756] [2021-05-02 12:19:58,200 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-02 12:19:58,200 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:58,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-02 12:19:58,201 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1299, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 12:19:58,201 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand has 38 states, 38 states have (on average 1.131578947368421) internal successors, (43), 37 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:59,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:59,866 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2021-05-02 12:19:59,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-02 12:19:59,867 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.131578947368421) internal successors, (43), 37 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 44 [2021-05-02 12:19:59,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:59,867 INFO L225 Difference]: With dead ends: 51 [2021-05-02 12:19:59,867 INFO L226 Difference]: Without dead ends: 46 [2021-05-02 12:19:59,868 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 565 ImplicationChecksByTransitivity, 1922.9ms TimeCoverageRelationStatistics Valid=277, Invalid=4835, Unknown=0, NotChecked=0, Total=5112 [2021-05-02 12:19:59,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-05-02 12:19:59,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2021-05-02 12:19:59,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.024390243902439) internal successors, (42), 41 states have internal predecessors, (42), 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 12:19:59,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2021-05-02 12:19:59,872 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2021-05-02 12:19:59,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:59,872 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2021-05-02 12:19:59,872 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 1.131578947368421) internal successors, (43), 37 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:59,872 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2021-05-02 12:19:59,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 12:19:59,872 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:59,872 INFO L523 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:20:00,076 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-05-02 12:20:00,076 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:20:00,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:20:00,076 INFO L82 PathProgramCache]: Analyzing trace with hash 1595265820, now seen corresponding path program 34 times [2021-05-02 12:20:00,076 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:20:00,076 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [740938877] [2021-05-02 12:20:00,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:20:00,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:00,789 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:20:00,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:00,793 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:20:00,793 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:20:00,793 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [740938877] [2021-05-02 12:20:00,793 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [740938877] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:00,793 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1738098250] [2021-05-02 12:20:00,793 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 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 12:20:00,830 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:20:00,830 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:20:00,831 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 71 conjunts are in the unsatisfiable core [2021-05-02 12:20:00,832 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:20:00,926 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:00,933 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:20:00,934 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1738098250] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:00,934 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:20:00,934 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 37] total 39 [2021-05-02 12:20:00,934 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [22003812] [2021-05-02 12:20:00,934 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-02 12:20:00,934 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:20:00,934 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-02 12:20:00,934 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1372, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 12:20:00,935 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand has 39 states, 39 states have (on average 1.1282051282051282) internal successors, (44), 38 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 12:20:02,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:20:02,644 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2021-05-02 12:20:02,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-02 12:20:02,644 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.1282051282051282) internal successors, (44), 38 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 12:20:02,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:20:02,644 INFO L225 Difference]: With dead ends: 52 [2021-05-02 12:20:02,644 INFO L226 Difference]: Without dead ends: 47 [2021-05-02 12:20:02,645 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 599 ImplicationChecksByTransitivity, 1829.4ms TimeCoverageRelationStatistics Valid=285, Invalid=5117, Unknown=0, NotChecked=0, Total=5402 [2021-05-02 12:20:02,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-05-02 12:20:02,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2021-05-02 12:20:02,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 42 states have (on average 1.0238095238095237) internal successors, (43), 42 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 12:20:02,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2021-05-02 12:20:02,649 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2021-05-02 12:20:02,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:20:02,649 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2021-05-02 12:20:02,649 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 1.1282051282051282) internal successors, (44), 38 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 12:20:02,649 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2021-05-02 12:20:02,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-02 12:20:02,649 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:20:02,649 INFO L523 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:20:02,849 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-05-02 12:20:02,850 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:20:02,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:20:02,850 INFO L82 PathProgramCache]: Analyzing trace with hash -2049905866, now seen corresponding path program 35 times [2021-05-02 12:20:02,850 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:20:02,850 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [809603379] [2021-05-02 12:20:02,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:20:02,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:03,580 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:20:03,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:03,583 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:20:03,583 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:20:03,583 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [809603379] [2021-05-02 12:20:03,583 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [809603379] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:03,583 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1938636314] [2021-05-02 12:20:03,583 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 12:20:13,522 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 19 check-sat command(s) [2021-05-02 12:20:13,522 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:20:13,528 WARN L261 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 108 conjunts are in the unsatisfiable core [2021-05-02 12:20:13,529 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:20:14,376 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:14,382 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:20:14,382 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1938636314] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:14,382 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:20:14,382 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38] total 40 [2021-05-02 12:20:14,382 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1141871643] [2021-05-02 12:20:14,383 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-02 12:20:14,383 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:20:14,383 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-02 12:20:14,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1447, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 12:20:14,383 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand has 40 states, 40 states have (on average 1.125) internal successors, (45), 39 states have internal predecessors, (45), 2 states have call successors, (4), 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 12:20:16,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:20:16,226 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2021-05-02 12:20:16,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-02 12:20:16,228 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.125) internal successors, (45), 39 states have internal predecessors, (45), 2 states have call successors, (4), 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 46 [2021-05-02 12:20:16,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:20:16,228 INFO L225 Difference]: With dead ends: 53 [2021-05-02 12:20:16,228 INFO L226 Difference]: Without dead ends: 48 [2021-05-02 12:20:16,228 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 14 SyntacticMatches, 34 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 700 ImplicationChecksByTransitivity, 2692.8ms TimeCoverageRelationStatistics Valid=293, Invalid=5407, Unknown=0, NotChecked=0, Total=5700 [2021-05-02 12:20:16,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-02 12:20:16,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2021-05-02 12:20:16,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 43 states have (on average 1.0232558139534884) internal successors, (44), 43 states have internal predecessors, (44), 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 12:20:16,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2021-05-02 12:20:16,231 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2021-05-02 12:20:16,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:20:16,231 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2021-05-02 12:20:16,231 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 40 states have (on average 1.125) internal successors, (45), 39 states have internal predecessors, (45), 2 states have call successors, (4), 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 12:20:16,232 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2021-05-02 12:20:16,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 12:20:16,232 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:20:16,232 INFO L523 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:20:16,432 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-05-02 12:20:16,432 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:20:16,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:20:16,433 INFO L82 PathProgramCache]: Analyzing trace with hash 913888860, now seen corresponding path program 36 times [2021-05-02 12:20:16,433 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:20:16,433 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1217311446] [2021-05-02 12:20:16,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:20:16,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:17,278 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:20:17,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:17,289 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:20:17,289 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:20:17,289 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1217311446] [2021-05-02 12:20:17,289 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1217311446] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:17,289 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2416413] [2021-05-02 12:20:17,289 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 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 12:20:18,817 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2021-05-02 12:20:18,817 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:20:18,820 WARN L261 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 97 conjunts are in the unsatisfiable core [2021-05-02 12:20:18,821 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:20:19,276 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:20:19,277 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2416413] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:19,277 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:20:19,277 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 39] total 41 [2021-05-02 12:20:19,277 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [614490864] [2021-05-02 12:20:19,277 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-02 12:20:19,277 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:20:19,277 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-02 12:20:19,277 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1524, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 12:20:19,278 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand has 41 states, 41 states have (on average 1.1219512195121952) internal successors, (46), 40 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 12:20:21,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:20:21,186 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2021-05-02 12:20:21,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-02 12:20:21,186 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.1219512195121952) internal successors, (46), 40 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 12:20:21,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:20:21,186 INFO L225 Difference]: With dead ends: 54 [2021-05-02 12:20:21,186 INFO L226 Difference]: Without dead ends: 49 [2021-05-02 12:20:21,187 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 31 SyntacticMatches, 18 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 702 ImplicationChecksByTransitivity, 2486.0ms TimeCoverageRelationStatistics Valid=301, Invalid=5705, Unknown=0, NotChecked=0, Total=6006 [2021-05-02 12:20:21,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-02 12:20:21,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2021-05-02 12:20:21,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 44 states have (on average 1.0227272727272727) internal successors, (45), 44 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 12:20:21,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2021-05-02 12:20:21,191 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2021-05-02 12:20:21,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:20:21,191 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2021-05-02 12:20:21,191 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 1.1219512195121952) internal successors, (46), 40 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 12:20:21,191 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2021-05-02 12:20:21,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-05-02 12:20:21,191 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:20:21,192 INFO L523 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:20:21,395 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-05-02 12:20:21,395 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:20:21,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:20:21,396 INFO L82 PathProgramCache]: Analyzing trace with hash -1697755146, now seen corresponding path program 37 times [2021-05-02 12:20:21,396 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:20:21,396 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1468169659] [2021-05-02 12:20:21,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:20:21,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:22,220 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:20:22,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:22,223 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:20:22,223 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:20:22,223 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1468169659] [2021-05-02 12:20:22,223 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1468169659] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:22,223 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1526863708] [2021-05-02 12:20:22,223 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 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 12:20:22,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:22,262 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 77 conjunts are in the unsatisfiable core [2021-05-02 12:20:22,263 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:20:22,378 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:22,386 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:20:22,386 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1526863708] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:22,386 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:20:22,386 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 40] total 42 [2021-05-02 12:20:22,386 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [750896962] [2021-05-02 12:20:22,386 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-02 12:20:22,386 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:20:22,386 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-02 12:20:22,387 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=1603, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 12:20:22,387 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand has 42 states, 42 states have (on average 1.119047619047619) internal successors, (47), 41 states have internal predecessors, (47), 2 states have call successors, (4), 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 12:20:24,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:20:24,488 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2021-05-02 12:20:24,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-02 12:20:24,489 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.119047619047619) internal successors, (47), 41 states have internal predecessors, (47), 2 states have call successors, (4), 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 48 [2021-05-02 12:20:24,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:20:24,489 INFO L225 Difference]: With dead ends: 55 [2021-05-02 12:20:24,489 INFO L226 Difference]: Without dead ends: 50 [2021-05-02 12:20:24,490 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 707 ImplicationChecksByTransitivity, 2260.1ms TimeCoverageRelationStatistics Valid=309, Invalid=6011, Unknown=0, NotChecked=0, Total=6320 [2021-05-02 12:20:24,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-05-02 12:20:24,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2021-05-02 12:20:24,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 45 states have (on average 1.0222222222222221) internal successors, (46), 45 states have internal predecessors, (46), 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 12:20:24,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2021-05-02 12:20:24,494 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2021-05-02 12:20:24,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:20:24,494 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2021-05-02 12:20:24,494 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 1.119047619047619) internal successors, (47), 41 states have internal predecessors, (47), 2 states have call successors, (4), 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 12:20:24,494 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2021-05-02 12:20:24,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-02 12:20:24,494 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:20:24,494 INFO L523 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:20:24,696 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable40 [2021-05-02 12:20:24,697 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:20:24,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:20:24,697 INFO L82 PathProgramCache]: Analyzing trace with hash -1054340708, now seen corresponding path program 38 times [2021-05-02 12:20:24,697 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:20:24,697 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1371776013] [2021-05-02 12:20:24,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:20:24,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:25,658 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:20:25,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:25,663 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:20:25,663 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:20:25,664 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1371776013] [2021-05-02 12:20:25,664 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1371776013] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:25,664 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [106685391] [2021-05-02 12:20:25,664 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 12:20:25,703 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:20:25,703 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:20:25,704 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 79 conjunts are in the unsatisfiable core [2021-05-02 12:20:25,705 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:20:25,848 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:25,855 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:20:25,855 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [106685391] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:25,855 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:20:25,855 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 41] total 43 [2021-05-02 12:20:25,855 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1166277172] [2021-05-02 12:20:25,856 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-02 12:20:25,856 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:20:25,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-02 12:20:25,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=1684, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 12:20:25,856 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand has 43 states, 43 states have (on average 1.1162790697674418) internal successors, (48), 42 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 12:20:27,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:20:27,993 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2021-05-02 12:20:27,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-02 12:20:27,994 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.1162790697674418) internal successors, (48), 42 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 12:20:27,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:20:27,994 INFO L225 Difference]: With dead ends: 56 [2021-05-02 12:20:27,994 INFO L226 Difference]: Without dead ends: 51 [2021-05-02 12:20:27,995 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 745 ImplicationChecksByTransitivity, 2366.0ms TimeCoverageRelationStatistics Valid=317, Invalid=6325, Unknown=0, NotChecked=0, Total=6642 [2021-05-02 12:20:27,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-05-02 12:20:27,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2021-05-02 12:20:27,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 46 states have (on average 1.0217391304347827) internal successors, (47), 46 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 12:20:27,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2021-05-02 12:20:27,998 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2021-05-02 12:20:27,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:20:27,998 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2021-05-02 12:20:27,999 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 1.1162790697674418) internal successors, (48), 42 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 12:20:27,999 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2021-05-02 12:20:27,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-02 12:20:27,999 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:20:27,999 INFO L523 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:20:28,221 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,39 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:20:28,221 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:20:28,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:20:28,221 INFO L82 PathProgramCache]: Analyzing trace with hash 1711637686, now seen corresponding path program 39 times [2021-05-02 12:20:28,221 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:20:28,221 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1563428541] [2021-05-02 12:20:28,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:20:28,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:29,103 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:20:29,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:29,107 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:20:29,107 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:20:29,107 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1563428541] [2021-05-02 12:20:29,107 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1563428541] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:29,107 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [435081538] [2021-05-02 12:20:29,107 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 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 12:20:29,788 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2021-05-02 12:20:29,789 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:20:29,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 99 conjunts are in the unsatisfiable core [2021-05-02 12:20:29,792 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:20:30,305 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:20:30,305 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [435081538] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:30,306 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:20:30,306 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42] total 44 [2021-05-02 12:20:30,306 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [150185149] [2021-05-02 12:20:30,306 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-02 12:20:30,306 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:20:30,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-02 12:20:30,307 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=1767, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 12:20:30,307 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand has 44 states, 44 states have (on average 1.1136363636363635) internal successors, (49), 43 states have internal predecessors, (49), 2 states have call successors, (4), 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 12:20:32,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:20:32,512 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2021-05-02 12:20:32,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-02 12:20:32,513 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.1136363636363635) internal successors, (49), 43 states have internal predecessors, (49), 2 states have call successors, (4), 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 50 [2021-05-02 12:20:32,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:20:32,513 INFO L225 Difference]: With dead ends: 57 [2021-05-02 12:20:32,513 INFO L226 Difference]: Without dead ends: 52 [2021-05-02 12:20:32,514 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 39 SyntacticMatches, 13 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 806 ImplicationChecksByTransitivity, 2707.4ms TimeCoverageRelationStatistics Valid=325, Invalid=6647, Unknown=0, NotChecked=0, Total=6972 [2021-05-02 12:20:32,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-05-02 12:20:32,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2021-05-02 12:20:32,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 47 states have (on average 1.0212765957446808) internal successors, (48), 47 states have internal predecessors, (48), 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 12:20:32,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2021-05-02 12:20:32,518 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2021-05-02 12:20:32,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:20:32,518 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2021-05-02 12:20:32,518 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 44 states have (on average 1.1136363636363635) internal successors, (49), 43 states have internal predecessors, (49), 2 states have call successors, (4), 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 12:20:32,518 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2021-05-02 12:20:32,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-02 12:20:32,518 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:20:32,518 INFO L523 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:20:32,722 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,40 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:20:32,722 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:20:32,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:20:32,723 INFO L82 PathProgramCache]: Analyzing trace with hash 1557621980, now seen corresponding path program 40 times [2021-05-02 12:20:32,723 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:20:32,723 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1945827966] [2021-05-02 12:20:32,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:20:32,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:33,733 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:20:33,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:33,746 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:20:33,746 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:20:33,746 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1945827966] [2021-05-02 12:20:33,746 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1945827966] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:33,746 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [982563152] [2021-05-02 12:20:33,746 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 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 12:20:33,797 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:20:33,797 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:20:33,798 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 83 conjunts are in the unsatisfiable core [2021-05-02 12:20:33,799 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:20:33,929 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:33,940 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:20:33,940 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [982563152] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:33,940 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:20:33,940 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 43] total 45 [2021-05-02 12:20:33,941 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [310690038] [2021-05-02 12:20:33,941 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-02 12:20:33,941 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:20:33,941 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-02 12:20:33,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1852, Unknown=0, NotChecked=0, Total=1980 [2021-05-02 12:20:33,942 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand has 45 states, 45 states have (on average 1.1111111111111112) internal successors, (50), 44 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 12:20:36,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:20:36,185 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2021-05-02 12:20:36,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-02 12:20:36,185 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.1111111111111112) internal successors, (50), 44 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 12:20:36,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:20:36,185 INFO L225 Difference]: With dead ends: 58 [2021-05-02 12:20:36,185 INFO L226 Difference]: Without dead ends: 53 [2021-05-02 12:20:36,186 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 824 ImplicationChecksByTransitivity, 2520.3ms TimeCoverageRelationStatistics Valid=333, Invalid=6977, Unknown=0, NotChecked=0, Total=7310 [2021-05-02 12:20:36,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-02 12:20:36,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2021-05-02 12:20:36,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 48 states have (on average 1.0208333333333333) internal successors, (49), 48 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 12:20:36,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2021-05-02 12:20:36,189 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2021-05-02 12:20:36,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:20:36,190 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2021-05-02 12:20:36,190 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 45 states, 45 states have (on average 1.1111111111111112) internal successors, (50), 44 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 12:20:36,190 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2021-05-02 12:20:36,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-02 12:20:36,190 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:20:36,190 INFO L523 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:20:36,390 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,41 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:20:36,391 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:20:36,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:20:36,391 INFO L82 PathProgramCache]: Analyzing trace with hash 1078102390, now seen corresponding path program 41 times [2021-05-02 12:20:36,391 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:20:36,391 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1763485618] [2021-05-02 12:20:36,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:20:36,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:37,335 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:20:37,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:37,342 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:20:37,342 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:20:37,342 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1763485618] [2021-05-02 12:20:37,342 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1763485618] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:37,342 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [180281575] [2021-05-02 12:20:37,342 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 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 12:20:50,085 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 22 check-sat command(s) [2021-05-02 12:20:50,085 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:20:50,092 WARN L261 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 125 conjunts are in the unsatisfiable core [2021-05-02 12:20:50,093 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:20:51,198 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:51,204 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:20:51,205 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [180281575] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:51,205 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:20:51,205 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 44] total 46 [2021-05-02 12:20:51,205 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1964638776] [2021-05-02 12:20:51,205 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-02 12:20:51,205 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:20:51,205 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-02 12:20:51,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=1939, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 12:20:51,205 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand has 46 states, 46 states have (on average 1.108695652173913) internal successors, (51), 45 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:53,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:20:53,591 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2021-05-02 12:20:53,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-02 12:20:53,591 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.108695652173913) internal successors, (51), 45 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 52 [2021-05-02 12:20:53,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:20:53,592 INFO L225 Difference]: With dead ends: 59 [2021-05-02 12:20:53,592 INFO L226 Difference]: Without dead ends: 54 [2021-05-02 12:20:53,592 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 14 SyntacticMatches, 40 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 943 ImplicationChecksByTransitivity, 3416.7ms TimeCoverageRelationStatistics Valid=341, Invalid=7315, Unknown=0, NotChecked=0, Total=7656 [2021-05-02 12:20:53,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-05-02 12:20:53,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2021-05-02 12:20:53,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 49 states have (on average 1.0204081632653061) internal successors, (50), 49 states have internal predecessors, (50), 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 12:20:53,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2021-05-02 12:20:53,595 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2021-05-02 12:20:53,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:20:53,596 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2021-05-02 12:20:53,596 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 46 states have (on average 1.108695652173913) internal successors, (51), 45 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:53,596 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2021-05-02 12:20:53,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-02 12:20:53,596 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:20:53,596 INFO L523 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:20:53,800 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2021-05-02 12:20:53,800 INFO L428 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:20:53,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:20:53,800 INFO L82 PathProgramCache]: Analyzing trace with hash -902103012, now seen corresponding path program 42 times [2021-05-02 12:20:53,800 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:20:53,801 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [629412732] [2021-05-02 12:20:53,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:20:53,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:54,807 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:20:54,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:54,810 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:20:54,810 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:20:54,810 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [629412732] [2021-05-02 12:20:54,810 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [629412732] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:54,810 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [80762435] [2021-05-02 12:20:54,810 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 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 12:20:56,090 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 22 check-sat command(s) [2021-05-02 12:20:56,090 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:20:56,093 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 103 conjunts are in the unsatisfiable core [2021-05-02 12:20:56,094 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:20:56,449 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:20:56,449 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [80762435] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:56,449 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:20:56,449 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 45] total 47 [2021-05-02 12:20:56,449 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [305336633] [2021-05-02 12:20:56,449 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-02 12:20:56,450 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:20:56,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-02 12:20:56,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=2028, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 12:20:56,450 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand has 47 states, 47 states have (on average 1.1063829787234043) internal successors, (52), 46 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 12:20:58,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:20:58,926 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2021-05-02 12:20:58,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-02 12:20:58,926 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.1063829787234043) internal successors, (52), 46 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 12:20:58,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:20:58,927 INFO L225 Difference]: With dead ends: 60 [2021-05-02 12:20:58,927 INFO L226 Difference]: Without dead ends: 55 [2021-05-02 12:20:58,927 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 44 SyntacticMatches, 11 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 925 ImplicationChecksByTransitivity, 2854.6ms TimeCoverageRelationStatistics Valid=349, Invalid=7661, Unknown=0, NotChecked=0, Total=8010 [2021-05-02 12:20:58,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-05-02 12:20:58,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2021-05-02 12:20:58,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 50 states have (on average 1.02) internal successors, (51), 50 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 12:20:58,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2021-05-02 12:20:58,930 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2021-05-02 12:20:58,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:20:58,930 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2021-05-02 12:20:58,930 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 1.1063829787234043) internal successors, (52), 46 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 12:20:58,930 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2021-05-02 12:20:58,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-05-02 12:20:58,930 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:20:58,931 INFO L523 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:20:59,131 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45,43 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:20:59,131 INFO L428 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:20:59,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:20:59,131 INFO L82 PathProgramCache]: Analyzing trace with hash 2136038966, now seen corresponding path program 43 times [2021-05-02 12:20:59,132 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:20:59,132 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1455306974] [2021-05-02 12:20:59,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:20:59,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:00,170 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:21:00,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:00,185 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:21:00,186 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:21:00,186 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1455306974] [2021-05-02 12:21:00,186 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1455306974] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:00,186 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [266008153] [2021-05-02 12:21:00,186 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 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 12:21:00,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:00,255 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 89 conjunts are in the unsatisfiable core [2021-05-02 12:21:00,256 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:21:00,373 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:00,379 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:21:00,379 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [266008153] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:00,379 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:21:00,379 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 46] total 48 [2021-05-02 12:21:00,379 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [151206671] [2021-05-02 12:21:00,379 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2021-05-02 12:21:00,380 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:21:00,380 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-05-02 12:21:00,380 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=2119, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 12:21:00,380 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand has 48 states, 48 states have (on average 1.1041666666666667) internal successors, (53), 47 states have internal predecessors, (53), 2 states have call successors, (4), 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 12:21:02,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:21:02,958 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2021-05-02 12:21:02,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-02 12:21:02,959 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 1.1041666666666667) internal successors, (53), 47 states have internal predecessors, (53), 2 states have call successors, (4), 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 54 [2021-05-02 12:21:02,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:21:02,959 INFO L225 Difference]: With dead ends: 61 [2021-05-02 12:21:02,959 INFO L226 Difference]: Without dead ends: 56 [2021-05-02 12:21:02,960 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 950 ImplicationChecksByTransitivity, 2705.2ms TimeCoverageRelationStatistics Valid=357, Invalid=8015, Unknown=0, NotChecked=0, Total=8372 [2021-05-02 12:21:02,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-05-02 12:21:02,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2021-05-02 12:21:02,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 51 states have (on average 1.0196078431372548) internal successors, (52), 51 states have internal predecessors, (52), 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 12:21:02,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2021-05-02 12:21:02,963 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2021-05-02 12:21:02,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:21:02,963 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2021-05-02 12:21:02,963 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 48 states, 48 states have (on average 1.1041666666666667) internal successors, (53), 47 states have internal predecessors, (53), 2 states have call successors, (4), 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 12:21:02,963 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2021-05-02 12:21:02,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-02 12:21:02,963 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:21:02,963 INFO L523 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:21:03,163 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46,44 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:21:03,164 INFO L428 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:21:03,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:21:03,164 INFO L82 PathProgramCache]: Analyzing trace with hash 1829159772, now seen corresponding path program 44 times [2021-05-02 12:21:03,164 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:21:03,164 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2129547280] [2021-05-02 12:21:03,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:21:03,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:04,289 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:21:04,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:04,305 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:21:04,305 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:21:04,305 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2129547280] [2021-05-02 12:21:04,305 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2129547280] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:04,305 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [115798614] [2021-05-02 12:21:04,305 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 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 12:21:04,348 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:21:04,348 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:21:04,349 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 91 conjunts are in the unsatisfiable core [2021-05-02 12:21:04,350 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:21:04,473 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:04,479 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:21:04,479 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [115798614] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:04,479 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:21:04,479 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 47] total 49 [2021-05-02 12:21:04,479 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [420388273] [2021-05-02 12:21:04,479 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-02 12:21:04,479 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:21:04,479 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-02 12:21:04,480 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=2212, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 12:21:04,480 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand has 49 states, 49 states have (on average 1.1020408163265305) internal successors, (54), 48 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 12:21:07,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:21:07,203 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2021-05-02 12:21:07,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-05-02 12:21:07,203 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.1020408163265305) internal successors, (54), 48 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 12:21:07,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:21:07,204 INFO L225 Difference]: With dead ends: 62 [2021-05-02 12:21:07,204 INFO L226 Difference]: Without dead ends: 57 [2021-05-02 12:21:07,204 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 994 ImplicationChecksByTransitivity, 2874.7ms TimeCoverageRelationStatistics Valid=365, Invalid=8377, Unknown=0, NotChecked=0, Total=8742 [2021-05-02 12:21:07,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-05-02 12:21:07,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2021-05-02 12:21:07,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 52 states have (on average 1.0192307692307692) internal successors, (53), 52 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 12:21:07,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2021-05-02 12:21:07,209 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 55 [2021-05-02 12:21:07,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:21:07,209 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2021-05-02 12:21:07,209 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 49 states have (on average 1.1020408163265305) internal successors, (54), 48 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 12:21:07,209 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2021-05-02 12:21:07,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-05-02 12:21:07,210 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:21:07,210 INFO L523 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:21:07,416 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-05-02 12:21:07,417 INFO L428 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:21:07,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:21:07,417 INFO L82 PathProgramCache]: Analyzing trace with hash 905839350, now seen corresponding path program 45 times [2021-05-02 12:21:07,417 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:21:07,417 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [944517066] [2021-05-02 12:21:07,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:21:07,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:08,576 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:21:08,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:08,579 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:21:08,579 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:21:08,579 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [944517066] [2021-05-02 12:21:08,579 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [944517066] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:08,580 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [93952693] [2021-05-02 12:21:08,580 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 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 12:21:09,260 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2021-05-02 12:21:09,260 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:21:09,263 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 105 conjunts are in the unsatisfiable core [2021-05-02 12:21:09,264 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:21:09,616 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:21:09,616 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [93952693] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:09,616 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:21:09,616 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 48] total 50 [2021-05-02 12:21:09,616 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [196609856] [2021-05-02 12:21:09,616 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-02 12:21:09,616 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:21:09,616 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-02 12:21:09,616 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=2307, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 12:21:09,617 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand has 50 states, 50 states have (on average 1.1) internal successors, (55), 49 states have internal predecessors, (55), 2 states have call successors, (4), 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 12:21:12,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:21:12,431 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2021-05-02 12:21:12,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-02 12:21:12,431 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 1.1) internal successors, (55), 49 states have internal predecessors, (55), 2 states have call successors, (4), 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 56 [2021-05-02 12:21:12,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:21:12,432 INFO L225 Difference]: With dead ends: 63 [2021-05-02 12:21:12,432 INFO L226 Difference]: Without dead ends: 58 [2021-05-02 12:21:12,432 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 51 SyntacticMatches, 7 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1049 ImplicationChecksByTransitivity, 3174.3ms TimeCoverageRelationStatistics Valid=373, Invalid=8747, Unknown=0, NotChecked=0, Total=9120 [2021-05-02 12:21:12,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-05-02 12:21:12,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2021-05-02 12:21:12,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 53 states have (on average 1.0188679245283019) internal successors, (54), 53 states have internal predecessors, (54), 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 12:21:12,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2021-05-02 12:21:12,435 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 56 [2021-05-02 12:21:12,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:21:12,435 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2021-05-02 12:21:12,435 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 1.1) internal successors, (55), 49 states have internal predecessors, (55), 2 states have call successors, (4), 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 12:21:12,435 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2021-05-02 12:21:12,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-02 12:21:12,436 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:21:12,436 INFO L523 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:21:12,636 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-05-02 12:21:12,636 INFO L428 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:21:12,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:21:12,637 INFO L82 PathProgramCache]: Analyzing trace with hash -1947289956, now seen corresponding path program 46 times [2021-05-02 12:21:12,637 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:21:12,637 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [716587685] [2021-05-02 12:21:12,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:21:12,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:13,804 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:21:13,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:13,812 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:21:13,812 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:21:13,812 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [716587685] [2021-05-02 12:21:13,812 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [716587685] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:13,812 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [794726822] [2021-05-02 12:21:13,812 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 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 12:21:13,856 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:21:13,856 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:21:13,858 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 95 conjunts are in the unsatisfiable core [2021-05-02 12:21:13,858 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:21:13,980 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:13,990 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:21:13,991 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [794726822] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:13,991 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:21:13,991 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 49] total 51 [2021-05-02 12:21:13,991 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1992900160] [2021-05-02 12:21:13,991 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2021-05-02 12:21:13,991 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:21:13,991 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-05-02 12:21:13,991 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=2404, Unknown=0, NotChecked=0, Total=2550 [2021-05-02 12:21:13,991 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand has 51 states, 51 states have (on average 1.0980392156862746) internal successors, (56), 50 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 12:21:16,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:21:16,931 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2021-05-02 12:21:16,932 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-05-02 12:21:16,932 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.0980392156862746) internal successors, (56), 50 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 12:21:16,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:21:16,932 INFO L225 Difference]: With dead ends: 64 [2021-05-02 12:21:16,932 INFO L226 Difference]: Without dead ends: 59 [2021-05-02 12:21:16,933 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 58 SyntacticMatches, 1 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1085 ImplicationChecksByTransitivity, 3058.2ms TimeCoverageRelationStatistics Valid=381, Invalid=9125, Unknown=0, NotChecked=0, Total=9506 [2021-05-02 12:21:16,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-05-02 12:21:16,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2021-05-02 12:21:16,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 54 states have (on average 1.0185185185185186) internal successors, (55), 54 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 12:21:16,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2021-05-02 12:21:16,938 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 57 [2021-05-02 12:21:16,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:21:16,938 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2021-05-02 12:21:16,938 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 51 states, 51 states have (on average 1.0980392156862746) internal successors, (56), 50 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 12:21:16,938 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2021-05-02 12:21:16,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-02 12:21:16,938 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:21:16,939 INFO L523 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:21:17,159 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-05-02 12:21:17,159 INFO L428 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:21:17,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:21:17,159 INFO L82 PathProgramCache]: Analyzing trace with hash -199985226, now seen corresponding path program 47 times [2021-05-02 12:21:17,159 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:21:17,159 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1974862841] [2021-05-02 12:21:17,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:21:17,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:18,378 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:21:18,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:18,394 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:21:18,394 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:21:18,394 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1974862841] [2021-05-02 12:21:18,394 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1974862841] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:18,394 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1882810735] [2021-05-02 12:21:18,394 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 12:21:46,084 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 25 check-sat command(s) [2021-05-02 12:21:46,084 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:21:46,093 WARN L261 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 142 conjunts are in the unsatisfiable core [2021-05-02 12:21:46,094 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:21:47,456 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:47,464 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:21:47,464 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1882810735] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:47,464 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:21:47,464 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 50] total 52 [2021-05-02 12:21:47,464 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1183126207] [2021-05-02 12:21:47,465 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2021-05-02 12:21:47,465 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:21:47,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-05-02 12:21:47,465 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=2503, Unknown=0, NotChecked=0, Total=2652 [2021-05-02 12:21:47,465 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand has 52 states, 52 states have (on average 1.0961538461538463) internal successors, (57), 51 states have internal predecessors, (57), 2 states have call successors, (4), 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 12:21:50,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:21:50,510 INFO L93 Difference]: Finished difference Result 65 states and 65 transitions. [2021-05-02 12:21:50,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-02 12:21:50,510 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 1.0961538461538463) internal successors, (57), 51 states have internal predecessors, (57), 2 states have call successors, (4), 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 58 [2021-05-02 12:21:50,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:21:50,511 INFO L225 Difference]: With dead ends: 65 [2021-05-02 12:21:50,511 INFO L226 Difference]: Without dead ends: 60 [2021-05-02 12:21:50,511 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 14 SyntacticMatches, 46 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1222 ImplicationChecksByTransitivity, 4382.7ms TimeCoverageRelationStatistics Valid=389, Invalid=9511, Unknown=0, NotChecked=0, Total=9900 [2021-05-02 12:21:50,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-05-02 12:21:50,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2021-05-02 12:21:50,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 55 states have (on average 1.018181818181818) internal successors, (56), 55 states have internal predecessors, (56), 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 12:21:50,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 60 transitions. [2021-05-02 12:21:50,515 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 60 transitions. Word has length 58 [2021-05-02 12:21:50,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:21:50,516 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 60 transitions. [2021-05-02 12:21:50,516 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 52 states, 52 states have (on average 1.0961538461538463) internal successors, (57), 51 states have internal predecessors, (57), 2 states have call successors, (4), 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 12:21:50,516 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 60 transitions. [2021-05-02 12:21:50,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 12:21:50,516 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:21:50,516 INFO L523 BasicCegarLoop]: trace histogram [48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:21:50,723 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,48 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:21:50,723 INFO L428 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:21:50,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:21:50,723 INFO L82 PathProgramCache]: Analyzing trace with hash -1868113444, now seen corresponding path program 48 times [2021-05-02 12:21:50,723 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:21:50,723 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1407050272] [2021-05-02 12:21:50,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:21:50,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:51,986 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:21:51,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:51,989 INFO L134 CoverageAnalysis]: Checked inductivity of 1176 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:21:51,989 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:21:51,989 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1407050272] [2021-05-02 12:21:51,989 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1407050272] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:51,989 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [265809663] [2021-05-02 12:21:51,989 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 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 12:21:56,012 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2021-05-02 12:21:56,012 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:21:56,018 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 109 conjunts are in the unsatisfiable core [2021-05-02 12:21:56,019 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:21:56,330 INFO L134 CoverageAnalysis]: Checked inductivity of 1176 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:21:56,330 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [265809663] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:56,331 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:21:56,331 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 51] total 53 [2021-05-02 12:21:56,331 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1369036940] [2021-05-02 12:21:56,331 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2021-05-02 12:21:56,331 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:21:56,331 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-05-02 12:21:56,331 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=2604, Unknown=0, NotChecked=0, Total=2756 [2021-05-02 12:21:56,331 INFO L87 Difference]: Start difference. First operand 60 states and 60 transitions. Second operand has 53 states, 53 states have (on average 1.0943396226415094) internal successors, (58), 52 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 12:21:59,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:21:59,500 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2021-05-02 12:21:59,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-05-02 12:21:59,501 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.0943396226415094) internal successors, (58), 52 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 12:21:59,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:21:59,501 INFO L225 Difference]: With dead ends: 66 [2021-05-02 12:21:59,502 INFO L226 Difference]: Without dead ends: 61 [2021-05-02 12:21:59,502 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 56 SyntacticMatches, 5 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1186 ImplicationChecksByTransitivity, 3447.9ms TimeCoverageRelationStatistics Valid=397, Invalid=9905, Unknown=0, NotChecked=0, Total=10302 [2021-05-02 12:21:59,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-05-02 12:21:59,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2021-05-02 12:21:59,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 56 states have (on average 1.0178571428571428) internal successors, (57), 56 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 12:21:59,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2021-05-02 12:21:59,507 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 59 [2021-05-02 12:21:59,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:21:59,507 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2021-05-02 12:21:59,507 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 53 states, 53 states have (on average 1.0943396226415094) internal successors, (58), 52 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 12:21:59,507 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2021-05-02 12:21:59,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-05-02 12:21:59,508 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:21:59,508 INFO L523 BasicCegarLoop]: trace histogram [49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:21:59,712 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,49 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:21:59,712 INFO L428 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:21:59,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:21:59,712 INFO L82 PathProgramCache]: Analyzing trace with hash -2040480650, now seen corresponding path program 49 times [2021-05-02 12:21:59,712 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:21:59,712 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1938071974] [2021-05-02 12:21:59,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:21:59,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:22:01,011 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:22:01,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:22:01,014 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 12:22:01,015 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:22:01,015 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1938071974] [2021-05-02 12:22:01,015 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1938071974] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:22:01,015 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1574101580] [2021-05-02 12:22:01,015 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 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 12:22:01,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:22:01,063 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 101 conjunts are in the unsatisfiable core [2021-05-02 12:22:01,064 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:22:01,194 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:22:01,201 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 12:22:01,201 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1574101580] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:22:01,202 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:22:01,202 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 52] total 54 [2021-05-02 12:22:01,202 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1343695422] [2021-05-02 12:22:01,202 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2021-05-02 12:22:01,202 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:22:01,202 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-05-02 12:22:01,202 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=2707, Unknown=0, NotChecked=0, Total=2862 [2021-05-02 12:22:01,203 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand has 54 states, 54 states have (on average 1.0925925925925926) internal successors, (59), 53 states have internal predecessors, (59), 2 states have call successors, (4), 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 12:22:04,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:22:04,470 INFO L93 Difference]: Finished difference Result 67 states and 67 transitions. [2021-05-02 12:22:04,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-05-02 12:22:04,471 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 1.0925925925925926) internal successors, (59), 53 states have internal predecessors, (59), 2 states have call successors, (4), 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 60 [2021-05-02 12:22:04,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:22:04,471 INFO L225 Difference]: With dead ends: 67 [2021-05-02 12:22:04,471 INFO L226 Difference]: Without dead ends: 62 [2021-05-02 12:22:04,472 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 61 SyntacticMatches, 1 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1229 ImplicationChecksByTransitivity, 3386.6ms TimeCoverageRelationStatistics Valid=405, Invalid=10307, Unknown=0, NotChecked=0, Total=10712 [2021-05-02 12:22:04,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-05-02 12:22:04,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2021-05-02 12:22:04,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 57 states have (on average 1.0175438596491229) internal successors, (58), 57 states have internal predecessors, (58), 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 12:22:04,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 62 transitions. [2021-05-02 12:22:04,475 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 62 transitions. Word has length 60 [2021-05-02 12:22:04,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:22:04,476 INFO L480 AbstractCegarLoop]: Abstraction has 62 states and 62 transitions. [2021-05-02 12:22:04,476 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 54 states, 54 states have (on average 1.0925925925925926) internal successors, (59), 53 states have internal predecessors, (59), 2 states have call successors, (4), 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 12:22:04,476 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 62 transitions. [2021-05-02 12:22:04,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-02 12:22:04,476 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:22:04,476 INFO L523 BasicCegarLoop]: trace histogram [50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:22:04,676 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable52 [2021-05-02 12:22:04,677 INFO L428 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:22:04,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:22:04,677 INFO L82 PathProgramCache]: Analyzing trace with hash 1206070556, now seen corresponding path program 50 times [2021-05-02 12:22:04,677 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:22:04,677 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [193496247] [2021-05-02 12:22:04,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:22:04,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:22:06,032 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:22:06,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:22:06,035 INFO L134 CoverageAnalysis]: Checked inductivity of 1275 backedges. 0 proven. 1275 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:22:06,035 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:22:06,035 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [193496247] [2021-05-02 12:22:06,035 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [193496247] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:22:06,035 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [650530327] [2021-05-02 12:22:06,036 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 12:22:06,081 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:22:06,082 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:22:06,083 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 103 conjunts are in the unsatisfiable core [2021-05-02 12:22:06,085 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:22:06,235 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:22:06,241 INFO L134 CoverageAnalysis]: Checked inductivity of 1275 backedges. 0 proven. 1275 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:22:06,242 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [650530327] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:22:06,242 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:22:06,242 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 53] total 55 [2021-05-02 12:22:06,242 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [563059755] [2021-05-02 12:22:06,242 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2021-05-02 12:22:06,242 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:22:06,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-05-02 12:22:06,243 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=2812, Unknown=0, NotChecked=0, Total=2970 [2021-05-02 12:22:06,243 INFO L87 Difference]: Start difference. First operand 62 states and 62 transitions. Second operand has 55 states, 55 states have (on average 1.0909090909090908) internal successors, (60), 54 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 12:22:09,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:22:09,609 INFO L93 Difference]: Finished difference Result 68 states and 68 transitions. [2021-05-02 12:22:09,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-05-02 12:22:09,609 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 1.0909090909090908) internal successors, (60), 54 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 12:22:09,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:22:09,610 INFO L225 Difference]: With dead ends: 68 [2021-05-02 12:22:09,610 INFO L226 Difference]: Without dead ends: 63 [2021-05-02 12:22:09,610 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 62 SyntacticMatches, 1 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1279 ImplicationChecksByTransitivity, 3521.5ms TimeCoverageRelationStatistics Valid=413, Invalid=10717, Unknown=0, NotChecked=0, Total=11130 [2021-05-02 12:22:09,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-05-02 12:22:09,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2021-05-02 12:22:09,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 58 states have (on average 1.0172413793103448) internal successors, (59), 58 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 12:22:09,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2021-05-02 12:22:09,615 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 61 [2021-05-02 12:22:09,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:22:09,615 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2021-05-02 12:22:09,615 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 55 states, 55 states have (on average 1.0909090909090908) internal successors, (60), 54 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 12:22:09,615 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2021-05-02 12:22:09,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-05-02 12:22:09,616 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:22:09,616 INFO L523 BasicCegarLoop]: trace histogram [51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:22:09,824 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,51 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:22:09,825 INFO L428 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:22:09,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:22:09,825 INFO L82 PathProgramCache]: Analyzing trace with hash -1230057162, now seen corresponding path program 51 times [2021-05-02 12:22:09,825 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:22:09,825 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [940570121] [2021-05-02 12:22:09,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:22:09,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:22:11,228 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:22:11,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:22:11,232 INFO L134 CoverageAnalysis]: Checked inductivity of 1326 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:22:11,233 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:22:11,233 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [940570121] [2021-05-02 12:22:11,233 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [940570121] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:22:11,233 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1385717440] [2021-05-02 12:22:11,233 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 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 12:22:13,440 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2021-05-02 12:22:13,441 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:22:13,445 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 112 conjunts are in the unsatisfiable core [2021-05-02 12:22:13,446 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:22:13,680 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:22:13,681 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:22:13,683 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:22:13,798 INFO L134 CoverageAnalysis]: Checked inductivity of 1326 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:22:13,798 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1385717440] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:22:13,798 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:22:13,798 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 56] total 58 [2021-05-02 12:22:13,799 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [843626238] [2021-05-02 12:22:13,799 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2021-05-02 12:22:13,799 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:22:13,799 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-05-02 12:22:13,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=3141, Unknown=0, NotChecked=0, Total=3306 [2021-05-02 12:22:13,799 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand has 58 states, 58 states have (on average 1.0862068965517242) internal successors, (63), 56 states have internal predecessors, (63), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:22:17,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:22:17,359 INFO L93 Difference]: Finished difference Result 69 states and 69 transitions. [2021-05-02 12:22:17,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-05-02 12:22:17,363 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 1.0862068965517242) internal successors, (63), 56 states have internal predecessors, (63), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 62 [2021-05-02 12:22:17,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:22:17,364 INFO L225 Difference]: With dead ends: 69 [2021-05-02 12:22:17,364 INFO L226 Difference]: Without dead ends: 64 [2021-05-02 12:22:17,364 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 59 SyntacticMatches, 3 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1338 ImplicationChecksByTransitivity, 3837.8ms TimeCoverageRelationStatistics Valid=425, Invalid=11565, Unknown=0, NotChecked=0, Total=11990 [2021-05-02 12:22:17,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-05-02 12:22:17,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2021-05-02 12:22:17,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 59 states have (on average 1.0169491525423728) internal successors, (60), 59 states have internal predecessors, (60), 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 12:22:17,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 64 transitions. [2021-05-02 12:22:17,369 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 64 transitions. Word has length 62 [2021-05-02 12:22:17,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:22:17,369 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 64 transitions. [2021-05-02 12:22:17,369 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 58 states, 58 states have (on average 1.0862068965517242) internal successors, (63), 56 states have internal predecessors, (63), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:22:17,370 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 64 transitions. [2021-05-02 12:22:17,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-02 12:22:17,370 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:22:17,370 INFO L523 BasicCegarLoop]: trace histogram [52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:22:17,572 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2021-05-02 12:22:17,573 INFO L428 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:22:17,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:22:17,573 INFO L82 PathProgramCache]: Analyzing trace with hash 559394908, now seen corresponding path program 52 times [2021-05-02 12:22:17,573 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:22:17,573 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1280969495] [2021-05-02 12:22:17,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:22:17,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:22:19,068 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:22:19,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:22:19,071 INFO L134 CoverageAnalysis]: Checked inductivity of 1378 backedges. 0 proven. 1378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:22:19,071 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:22:19,071 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1280969495] [2021-05-02 12:22:19,071 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1280969495] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:22:19,071 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2103660878] [2021-05-02 12:22:19,071 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 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 12:22:19,123 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:22:19,124 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:22:19,125 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 107 conjunts are in the unsatisfiable core [2021-05-02 12:22:19,126 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:22:19,263 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:22:19,270 INFO L134 CoverageAnalysis]: Checked inductivity of 1378 backedges. 0 proven. 1378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:22:19,270 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2103660878] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:22:19,270 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:22:19,270 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 55] total 57 [2021-05-02 12:22:19,270 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [505748437] [2021-05-02 12:22:19,270 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2021-05-02 12:22:19,270 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:22:19,270 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-05-02 12:22:19,271 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=3028, Unknown=0, NotChecked=0, Total=3192 [2021-05-02 12:22:19,271 INFO L87 Difference]: Start difference. First operand 64 states and 64 transitions. Second operand has 57 states, 57 states have (on average 1.087719298245614) internal successors, (62), 56 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 12:22:22,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:22:22,867 INFO L93 Difference]: Finished difference Result 70 states and 70 transitions. [2021-05-02 12:22:22,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-05-02 12:22:22,867 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 1.087719298245614) internal successors, (62), 56 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 12:22:22,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:22:22,867 INFO L225 Difference]: With dead ends: 70 [2021-05-02 12:22:22,868 INFO L226 Difference]: Without dead ends: 65 [2021-05-02 12:22:22,868 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 64 SyntacticMatches, 1 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1382 ImplicationChecksByTransitivity, 3761.7ms TimeCoverageRelationStatistics Valid=429, Invalid=11561, Unknown=0, NotChecked=0, Total=11990 [2021-05-02 12:22:22,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-02 12:22:22,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2021-05-02 12:22:22,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 60 states have (on average 1.0166666666666666) internal successors, (61), 60 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 12:22:22,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 65 transitions. [2021-05-02 12:22:22,872 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 65 transitions. Word has length 63 [2021-05-02 12:22:22,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:22:22,872 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 65 transitions. [2021-05-02 12:22:22,872 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 57 states, 57 states have (on average 1.087719298245614) internal successors, (62), 56 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 12:22:22,873 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 65 transitions. [2021-05-02 12:22:22,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-02 12:22:22,873 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:22:22,873 INFO L523 BasicCegarLoop]: trace histogram [53, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:22:23,073 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable56 [2021-05-02 12:22:23,073 INFO L428 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:22:23,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:22:23,074 INFO L82 PathProgramCache]: Analyzing trace with hash 197834230, now seen corresponding path program 53 times [2021-05-02 12:22:23,074 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:22:23,074 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1053132233] [2021-05-02 12:22:23,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:22:23,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:22:24,569 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:22:24,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:22:24,572 INFO L134 CoverageAnalysis]: Checked inductivity of 1431 backedges. 0 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:22:24,572 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:22:24,572 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1053132233] [2021-05-02 12:22:24,572 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1053132233] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:22:24,572 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [539803035] [2021-05-02 12:22:24,572 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 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 12:24:25,327 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 28 check-sat command(s) [2021-05-02 12:24:25,327 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:24:25,344 WARN L261 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 150 conjunts are in the unsatisfiable core [2021-05-02 12:24:25,345 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:24:26,787 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:24:26,792 INFO L134 CoverageAnalysis]: Checked inductivity of 1431 backedges. 0 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:24:26,792 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [539803035] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:24:26,792 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:24:26,792 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 56] total 58 [2021-05-02 12:24:26,793 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1338014687] [2021-05-02 12:24:26,793 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2021-05-02 12:24:26,793 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:24:26,793 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-05-02 12:24:26,793 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=3139, Unknown=0, NotChecked=0, Total=3306 [2021-05-02 12:24:26,793 INFO L87 Difference]: Start difference. First operand 65 states and 65 transitions. Second operand has 58 states, 58 states have (on average 1.0862068965517242) internal successors, (63), 57 states have internal predecessors, (63), 2 states have call successors, (4), 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 12:24:30,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:24:30,511 INFO L93 Difference]: Finished difference Result 71 states and 71 transitions. [2021-05-02 12:24:30,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-05-02 12:24:30,512 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 1.0862068965517242) internal successors, (63), 57 states have internal predecessors, (63), 2 states have call successors, (4), 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 64 [2021-05-02 12:24:30,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:24:30,512 INFO L225 Difference]: With dead ends: 71 [2021-05-02 12:24:30,512 INFO L226 Difference]: Without dead ends: 66 [2021-05-02 12:24:30,513 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 24 SyntacticMatches, 42 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1517 ImplicationChecksByTransitivity, 5087.8ms TimeCoverageRelationStatistics Valid=437, Invalid=11995, Unknown=0, NotChecked=0, Total=12432 [2021-05-02 12:24:30,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-05-02 12:24:30,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2021-05-02 12:24:30,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 61 states have (on average 1.0163934426229508) internal successors, (62), 61 states have internal predecessors, (62), 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 12:24:30,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 66 transitions. [2021-05-02 12:24:30,517 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 66 transitions. Word has length 64 [2021-05-02 12:24:30,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:24:30,517 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 66 transitions. [2021-05-02 12:24:30,517 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 58 states, 58 states have (on average 1.0862068965517242) internal successors, (63), 57 states have internal predecessors, (63), 2 states have call successors, (4), 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 12:24:30,517 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 66 transitions. [2021-05-02 12:24:30,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-05-02 12:24:30,517 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:24:30,518 INFO L523 BasicCegarLoop]: trace histogram [54, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:24:30,718 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable57 [2021-05-02 12:24:30,718 INFO L428 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:24:30,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:24:30,718 INFO L82 PathProgramCache]: Analyzing trace with hash 1874355100, now seen corresponding path program 54 times [2021-05-02 12:24:30,718 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:24:30,718 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1606794823] [2021-05-02 12:24:30,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:24:30,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:24:32,284 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:24:32,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:24:32,288 INFO L134 CoverageAnalysis]: Checked inductivity of 1485 backedges. 0 proven. 1485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:24:32,288 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:24:32,288 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1606794823] [2021-05-02 12:24:32,288 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1606794823] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:24:32,288 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [446816413] [2021-05-02 12:24:32,288 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 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 12:24:38,348 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 28 check-sat command(s) [2021-05-02 12:24:38,348 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:24:38,353 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 122 conjunts are in the unsatisfiable core [2021-05-02 12:24:38,354 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:24:38,708 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:24:38,709 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:24:38,711 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:24:38,817 INFO L134 CoverageAnalysis]: Checked inductivity of 1485 backedges. 0 proven. 1485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:24:38,817 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [446816413] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:24:38,817 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:24:38,817 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 59] total 61 [2021-05-02 12:24:38,817 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1676400063] [2021-05-02 12:24:38,818 INFO L460 AbstractCegarLoop]: Interpolant automaton has 61 states [2021-05-02 12:24:38,818 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:24:38,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-05-02 12:24:38,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=3486, Unknown=0, NotChecked=0, Total=3660 [2021-05-02 12:24:38,818 INFO L87 Difference]: Start difference. First operand 66 states and 66 transitions. Second operand has 61 states, 61 states have (on average 1.0819672131147542) internal successors, (66), 59 states have internal predecessors, (66), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:24:42,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:24:42,762 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2021-05-02 12:24:42,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-05-02 12:24:42,762 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 1.0819672131147542) internal successors, (66), 59 states have internal predecessors, (66), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 65 [2021-05-02 12:24:42,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:24:42,763 INFO L225 Difference]: With dead ends: 72 [2021-05-02 12:24:42,763 INFO L226 Difference]: Without dead ends: 67 [2021-05-02 12:24:42,763 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 58 SyntacticMatches, 7 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1505 ImplicationChecksByTransitivity, 4384.9ms TimeCoverageRelationStatistics Valid=449, Invalid=12891, Unknown=0, NotChecked=0, Total=13340 [2021-05-02 12:24:42,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-05-02 12:24:42,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2021-05-02 12:24:42,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 62 states have (on average 1.0161290322580645) internal successors, (63), 62 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 12:24:42,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 67 transitions. [2021-05-02 12:24:42,772 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 67 transitions. Word has length 65 [2021-05-02 12:24:42,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:24:42,772 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 67 transitions. [2021-05-02 12:24:42,772 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 61 states, 61 states have (on average 1.0819672131147542) internal successors, (66), 59 states have internal predecessors, (66), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:24:42,772 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 67 transitions. [2021-05-02 12:24:42,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-05-02 12:24:42,773 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:24:42,773 INFO L523 BasicCegarLoop]: trace histogram [55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:24:42,976 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2021-05-02 12:24:42,977 INFO L428 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:24:42,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:24:42,977 INFO L82 PathProgramCache]: Analyzing trace with hash -1988072778, now seen corresponding path program 55 times [2021-05-02 12:24:42,977 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:24:42,977 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [677660498] [2021-05-02 12:24:42,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:24:42,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:24:44,574 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:24:44,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:24:44,579 INFO L134 CoverageAnalysis]: Checked inductivity of 1540 backedges. 0 proven. 1540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:24:44,579 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:24:44,579 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [677660498] [2021-05-02 12:24:44,580 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [677660498] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:24:44,580 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [928839441] [2021-05-02 12:24:44,580 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 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 12:24:44,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:24:44,626 INFO L263 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 113 conjunts are in the unsatisfiable core [2021-05-02 12:24:44,627 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:24:44,774 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:24:44,786 INFO L134 CoverageAnalysis]: Checked inductivity of 1540 backedges. 0 proven. 1540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:24:44,786 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [928839441] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:24:44,786 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:24:44,786 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 58] total 60 [2021-05-02 12:24:44,786 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1575685123] [2021-05-02 12:24:44,786 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2021-05-02 12:24:44,786 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:24:44,787 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-05-02 12:24:44,787 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=3367, Unknown=0, NotChecked=0, Total=3540 [2021-05-02 12:24:44,787 INFO L87 Difference]: Start difference. First operand 67 states and 67 transitions. Second operand has 60 states, 60 states have (on average 1.0833333333333333) internal successors, (65), 59 states have internal predecessors, (65), 2 states have call successors, (4), 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 12:24:48,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:24:48,791 INFO L93 Difference]: Finished difference Result 73 states and 73 transitions. [2021-05-02 12:24:48,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-05-02 12:24:48,791 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 1.0833333333333333) internal successors, (65), 59 states have internal predecessors, (65), 2 states have call successors, (4), 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 66 [2021-05-02 12:24:48,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:24:48,792 INFO L225 Difference]: With dead ends: 73 [2021-05-02 12:24:48,792 INFO L226 Difference]: Without dead ends: 68 [2021-05-02 12:24:48,792 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 67 SyntacticMatches, 1 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1544 ImplicationChecksByTransitivity, 4160.5ms TimeCoverageRelationStatistics Valid=453, Invalid=12887, Unknown=0, NotChecked=0, Total=13340 [2021-05-02 12:24:48,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-05-02 12:24:48,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2021-05-02 12:24:48,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 63 states have (on average 1.0158730158730158) internal successors, (64), 63 states have internal predecessors, (64), 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 12:24:48,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 68 transitions. [2021-05-02 12:24:48,796 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 68 transitions. Word has length 66 [2021-05-02 12:24:48,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:24:48,796 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 68 transitions. [2021-05-02 12:24:48,796 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 60 states, 60 states have (on average 1.0833333333333333) internal successors, (65), 59 states have internal predecessors, (65), 2 states have call successors, (4), 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 12:24:48,796 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 68 transitions. [2021-05-02 12:24:48,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-02 12:24:48,796 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:24:48,796 INFO L523 BasicCegarLoop]: trace histogram [56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:24:49,002 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60,56 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:24:49,002 INFO L428 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:24:49,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:24:49,002 INFO L82 PathProgramCache]: Analyzing trace with hash -1464252708, now seen corresponding path program 56 times [2021-05-02 12:24:49,002 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:24:49,003 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [160181958] [2021-05-02 12:24:49,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:24:49,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:24:50,686 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:24:50,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:24:50,688 INFO L134 CoverageAnalysis]: Checked inductivity of 1596 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:24:50,688 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:24:50,688 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [160181958] [2021-05-02 12:24:50,689 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [160181958] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:24:50,689 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2095408961] [2021-05-02 12:24:50,689 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 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 12:24:50,738 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:24:50,738 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:24:50,740 INFO L263 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 115 conjunts are in the unsatisfiable core [2021-05-02 12:24:50,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:24:50,893 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:24:50,901 INFO L134 CoverageAnalysis]: Checked inductivity of 1596 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:24:50,901 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2095408961] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:24:50,901 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:24:50,901 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 59] total 61 [2021-05-02 12:24:50,901 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1777096585] [2021-05-02 12:24:50,902 INFO L460 AbstractCegarLoop]: Interpolant automaton has 61 states [2021-05-02 12:24:50,902 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:24:50,902 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-05-02 12:24:50,902 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=3484, Unknown=0, NotChecked=0, Total=3660 [2021-05-02 12:24:50,902 INFO L87 Difference]: Start difference. First operand 68 states and 68 transitions. Second operand has 61 states, 61 states have (on average 1.0819672131147542) internal successors, (66), 60 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 12:24:55,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:24:55,025 INFO L93 Difference]: Finished difference Result 74 states and 74 transitions. [2021-05-02 12:24:55,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2021-05-02 12:24:55,025 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 1.0819672131147542) internal successors, (66), 60 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 12:24:55,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:24:55,026 INFO L225 Difference]: With dead ends: 74 [2021-05-02 12:24:55,026 INFO L226 Difference]: Without dead ends: 69 [2021-05-02 12:24:55,026 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 68 SyntacticMatches, 1 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1600 ImplicationChecksByTransitivity, 4334.9ms TimeCoverageRelationStatistics Valid=461, Invalid=13345, Unknown=0, NotChecked=0, Total=13806 [2021-05-02 12:24:55,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-05-02 12:24:55,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2021-05-02 12:24:55,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 64 states have (on average 1.015625) internal successors, (65), 64 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 12:24:55,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2021-05-02 12:24:55,030 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 67 [2021-05-02 12:24:55,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:24:55,031 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2021-05-02 12:24:55,031 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 61 states, 61 states have (on average 1.0819672131147542) internal successors, (66), 60 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 12:24:55,031 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2021-05-02 12:24:55,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-05-02 12:24:55,031 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:24:55,031 INFO L523 BasicCegarLoop]: trace histogram [57, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:24:55,240 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61,57 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:24:55,241 INFO L428 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:24:55,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:24:55,241 INFO L82 PathProgramCache]: Analyzing trace with hash 1889267574, now seen corresponding path program 57 times [2021-05-02 12:24:55,241 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:24:55,241 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [373832558] [2021-05-02 12:24:55,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:24:55,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:24:56,994 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:24:56,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:24:56,996 INFO L134 CoverageAnalysis]: Checked inductivity of 1653 backedges. 0 proven. 1653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:24:56,996 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:24:56,996 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [373832558] [2021-05-02 12:24:56,996 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [373832558] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:24:56,996 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1552545093] [2021-05-02 12:24:56,997 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 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 12:24:59,518 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2021-05-02 12:24:59,518 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:24:59,522 INFO L263 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 124 conjunts are in the unsatisfiable core [2021-05-02 12:24:59,523 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:24:59,785 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:24:59,786 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:24:59,788 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:24:59,895 INFO L134 CoverageAnalysis]: Checked inductivity of 1653 backedges. 0 proven. 1653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:24:59,895 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1552545093] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:24:59,895 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:24:59,895 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 62] total 64 [2021-05-02 12:24:59,895 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [67959752] [2021-05-02 12:24:59,895 INFO L460 AbstractCegarLoop]: Interpolant automaton has 64 states [2021-05-02 12:24:59,896 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:24:59,896 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-05-02 12:24:59,896 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=3849, Unknown=0, NotChecked=0, Total=4032 [2021-05-02 12:24:59,896 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand has 64 states, 64 states have (on average 1.078125) internal successors, (69), 62 states have internal predecessors, (69), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:25:04,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:25:04,268 INFO L93 Difference]: Finished difference Result 75 states and 75 transitions. [2021-05-02 12:25:04,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-05-02 12:25:04,268 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 1.078125) internal successors, (69), 62 states have internal predecessors, (69), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 68 [2021-05-02 12:25:04,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:25:04,268 INFO L225 Difference]: With dead ends: 75 [2021-05-02 12:25:04,268 INFO L226 Difference]: Without dead ends: 70 [2021-05-02 12:25:04,269 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 65 SyntacticMatches, 3 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1665 ImplicationChecksByTransitivity, 4726.4ms TimeCoverageRelationStatistics Valid=473, Invalid=14289, Unknown=0, NotChecked=0, Total=14762 [2021-05-02 12:25:04,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-05-02 12:25:04,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2021-05-02 12:25:04,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 65 states have (on average 1.0153846153846153) internal successors, (66), 65 states have internal predecessors, (66), 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 12:25:04,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 70 transitions. [2021-05-02 12:25:04,274 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 70 transitions. Word has length 68 [2021-05-02 12:25:04,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:25:04,274 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 70 transitions. [2021-05-02 12:25:04,274 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 64 states, 64 states have (on average 1.078125) internal successors, (69), 62 states have internal predecessors, (69), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:25:04,275 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 70 transitions. [2021-05-02 12:25:04,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-02 12:25:04,275 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:25:04,275 INFO L523 BasicCegarLoop]: trace histogram [58, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:25:04,475 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62,58 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:25:04,475 INFO L428 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:25:04,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:25:04,476 INFO L82 PathProgramCache]: Analyzing trace with hash -1525786084, now seen corresponding path program 58 times [2021-05-02 12:25:04,476 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:25:04,476 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1943931021] [2021-05-02 12:25:04,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:25:04,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:25:06,288 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:25:06,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:25:06,297 INFO L134 CoverageAnalysis]: Checked inductivity of 1711 backedges. 0 proven. 1711 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:25:06,297 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:25:06,297 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1943931021] [2021-05-02 12:25:06,297 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1943931021] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:25:06,297 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1649730787] [2021-05-02 12:25:06,297 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 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 12:25:06,344 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:25:06,344 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:25:06,346 INFO L263 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 119 conjunts are in the unsatisfiable core [2021-05-02 12:25:06,347 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:25:06,511 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:06,518 INFO L134 CoverageAnalysis]: Checked inductivity of 1711 backedges. 0 proven. 1711 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:25:06,518 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1649730787] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:25:06,518 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:25:06,518 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 61] total 63 [2021-05-02 12:25:06,518 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [134244554] [2021-05-02 12:25:06,518 INFO L460 AbstractCegarLoop]: Interpolant automaton has 63 states [2021-05-02 12:25:06,518 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:25:06,519 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-05-02 12:25:06,519 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=3724, Unknown=0, NotChecked=0, Total=3906 [2021-05-02 12:25:06,519 INFO L87 Difference]: Start difference. First operand 70 states and 70 transitions. Second operand has 63 states, 63 states have (on average 1.0793650793650793) internal successors, (68), 62 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 12:25:10,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:25:10,971 INFO L93 Difference]: Finished difference Result 76 states and 76 transitions. [2021-05-02 12:25:10,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-05-02 12:25:10,971 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 1.0793650793650793) internal successors, (68), 62 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 12:25:10,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:25:10,972 INFO L225 Difference]: With dead ends: 76 [2021-05-02 12:25:10,972 INFO L226 Difference]: Without dead ends: 71 [2021-05-02 12:25:10,973 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 70 SyntacticMatches, 1 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1715 ImplicationChecksByTransitivity, 4598.8ms TimeCoverageRelationStatistics Valid=477, Invalid=14285, Unknown=0, NotChecked=0, Total=14762 [2021-05-02 12:25:10,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-05-02 12:25:10,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2021-05-02 12:25:10,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 66 states have (on average 1.0151515151515151) internal successors, (67), 66 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 12:25:10,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 71 transitions. [2021-05-02 12:25:10,976 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 71 transitions. Word has length 69 [2021-05-02 12:25:10,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:25:10,976 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 71 transitions. [2021-05-02 12:25:10,976 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 63 states, 63 states have (on average 1.0793650793650793) internal successors, (68), 62 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 12:25:10,977 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 71 transitions. [2021-05-02 12:25:10,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-02 12:25:10,977 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:25:10,977 INFO L523 BasicCegarLoop]: trace histogram [59, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:25:11,182 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable64 [2021-05-02 12:25:11,182 INFO L428 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:25:11,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:25:11,182 INFO L82 PathProgramCache]: Analyzing trace with hash -18267082, now seen corresponding path program 59 times [2021-05-02 12:25:11,182 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:25:11,182 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1654094118] [2021-05-02 12:25:11,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:25:11,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:25:13,042 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:25:13,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:25:13,046 INFO L134 CoverageAnalysis]: Checked inductivity of 1770 backedges. 0 proven. 1770 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:25:13,046 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:25:13,046 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1654094118] [2021-05-02 12:25:13,046 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1654094118] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:25:13,046 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2103439358] [2021-05-02 12:25:13,046 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 12:25:57,352 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 31 check-sat command(s) [2021-05-02 12:25:57,352 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:25:57,365 WARN L261 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 176 conjunts are in the unsatisfiable core [2021-05-02 12:25:57,366 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:25:59,428 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:59,440 INFO L134 CoverageAnalysis]: Checked inductivity of 1770 backedges. 0 proven. 1770 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:25:59,441 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2103439358] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:25:59,441 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:25:59,441 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 62] total 64 [2021-05-02 12:25:59,441 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [751154602] [2021-05-02 12:25:59,441 INFO L460 AbstractCegarLoop]: Interpolant automaton has 64 states [2021-05-02 12:25:59,441 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:25:59,441 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-05-02 12:25:59,441 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=3847, Unknown=0, NotChecked=0, Total=4032 [2021-05-02 12:25:59,441 INFO L87 Difference]: Start difference. First operand 71 states and 71 transitions. Second operand has 64 states, 64 states have (on average 1.078125) internal successors, (69), 63 states have internal predecessors, (69), 2 states have call successors, (4), 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 12:26:04,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:26:04,149 INFO L93 Difference]: Finished difference Result 77 states and 77 transitions. [2021-05-02 12:26:04,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-05-02 12:26:04,149 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 1.078125) internal successors, (69), 63 states have internal predecessors, (69), 2 states have call successors, (4), 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 70 [2021-05-02 12:26:04,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:26:04,149 INFO L225 Difference]: With dead ends: 77 [2021-05-02 12:26:04,149 INFO L226 Difference]: Without dead ends: 72 [2021-05-02 12:26:04,150 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 18 SyntacticMatches, 54 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1880 ImplicationChecksByTransitivity, 6664.9ms TimeCoverageRelationStatistics Valid=485, Invalid=14767, Unknown=0, NotChecked=0, Total=15252 [2021-05-02 12:26:04,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-05-02 12:26:04,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2021-05-02 12:26:04,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 67 states have (on average 1.0149253731343284) internal successors, (68), 67 states have internal predecessors, (68), 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 12:26:04,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 72 transitions. [2021-05-02 12:26:04,154 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 72 transitions. Word has length 70 [2021-05-02 12:26:04,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:26:04,154 INFO L480 AbstractCegarLoop]: Abstraction has 72 states and 72 transitions. [2021-05-02 12:26:04,154 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 64 states, 64 states have (on average 1.078125) internal successors, (69), 63 states have internal predecessors, (69), 2 states have call successors, (4), 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 12:26:04,154 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 72 transitions. [2021-05-02 12:26:04,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-05-02 12:26:04,154 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:26:04,154 INFO L523 BasicCegarLoop]: trace histogram [60, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:26:04,362 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65,60 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:26:04,362 INFO L428 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:26:04,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:26:04,362 INFO L82 PathProgramCache]: Analyzing trace with hash -529818276, now seen corresponding path program 60 times [2021-05-02 12:26:04,362 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:26:04,362 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1310868311] [2021-05-02 12:26:04,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:26:04,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:26:06,347 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:26:06,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:26:06,357 INFO L134 CoverageAnalysis]: Checked inductivity of 1830 backedges. 0 proven. 1830 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:26:06,357 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:26:06,357 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1310868311] [2021-05-02 12:26:06,357 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1310868311] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:26:06,357 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [908882281] [2021-05-02 12:26:06,357 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 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 12:26:21,516 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 31 check-sat command(s) [2021-05-02 12:26:21,517 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:26:21,524 WARN L261 TraceCheckSpWp]: Trace formula consists of 265 conjuncts, 137 conjunts are in the unsatisfiable core [2021-05-02 12:26:21,525 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:26:22,032 INFO L134 CoverageAnalysis]: Checked inductivity of 1830 backedges. 0 proven. 1830 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:26:22,033 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [908882281] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:26:22,033 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:26:22,033 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 63] total 65 [2021-05-02 12:26:22,033 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [596909371] [2021-05-02 12:26:22,033 INFO L460 AbstractCegarLoop]: Interpolant automaton has 65 states [2021-05-02 12:26:22,033 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:26:22,033 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-05-02 12:26:22,033 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=188, Invalid=3972, Unknown=0, NotChecked=0, Total=4160 [2021-05-02 12:26:22,033 INFO L87 Difference]: Start difference. First operand 72 states and 72 transitions. Second operand has 65 states, 65 states have (on average 1.0769230769230769) internal successors, (70), 64 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 12:26:26,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:26:26,660 INFO L93 Difference]: Finished difference Result 78 states and 78 transitions. [2021-05-02 12:26:26,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-05-02 12:26:26,660 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 1.0769230769230769) internal successors, (70), 64 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 12:26:26,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:26:26,661 INFO L225 Difference]: With dead ends: 78 [2021-05-02 12:26:26,661 INFO L226 Difference]: Without dead ends: 73 [2021-05-02 12:26:26,662 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 64 SyntacticMatches, 9 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1848 ImplicationChecksByTransitivity, 5263.5ms TimeCoverageRelationStatistics Valid=493, Invalid=15257, Unknown=0, NotChecked=0, Total=15750 [2021-05-02 12:26:26,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2021-05-02 12:26:26,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2021-05-02 12:26:26,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 68 states have (on average 1.0147058823529411) internal successors, (69), 68 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 12:26:26,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 73 transitions. [2021-05-02 12:26:26,667 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 73 transitions. Word has length 71 [2021-05-02 12:26:26,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:26:26,668 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 73 transitions. [2021-05-02 12:26:26,668 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 65 states, 65 states have (on average 1.0769230769230769) internal successors, (70), 64 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 12:26:26,668 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 73 transitions. [2021-05-02 12:26:26,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-05-02 12:26:26,668 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:26:26,668 INFO L523 BasicCegarLoop]: trace histogram [61, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:26:26,874 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable66 [2021-05-02 12:26:26,874 INFO L428 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:26:26,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:26:26,874 INFO L82 PathProgramCache]: Analyzing trace with hash 791963894, now seen corresponding path program 61 times [2021-05-02 12:26:26,874 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:26:26,874 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1824808023] [2021-05-02 12:26:26,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:26:26,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:26:28,909 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:26:28,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:26:28,911 INFO L134 CoverageAnalysis]: Checked inductivity of 1891 backedges. 0 proven. 1891 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:26:28,911 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:26:28,911 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1824808023] [2021-05-02 12:26:28,912 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1824808023] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:26:28,912 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1878813589] [2021-05-02 12:26:28,912 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 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 12:26:28,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:26:28,961 INFO L263 TraceCheckSpWp]: Trace formula consists of 268 conjuncts, 125 conjunts are in the unsatisfiable core [2021-05-02 12:26:28,961 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:26:29,149 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:26:29,161 INFO L134 CoverageAnalysis]: Checked inductivity of 1891 backedges. 0 proven. 1891 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:26:29,162 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1878813589] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:26:29,162 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:26:29,162 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 64] total 66 [2021-05-02 12:26:29,162 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1611935152] [2021-05-02 12:26:29,162 INFO L460 AbstractCegarLoop]: Interpolant automaton has 66 states [2021-05-02 12:26:29,162 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:26:29,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-05-02 12:26:29,162 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=191, Invalid=4099, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 12:26:29,162 INFO L87 Difference]: Start difference. First operand 73 states and 73 transitions. Second operand has 66 states, 66 states have (on average 1.0757575757575757) internal successors, (71), 65 states have internal predecessors, (71), 2 states have call successors, (4), 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 12:26:34,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:26:34,067 INFO L93 Difference]: Finished difference Result 79 states and 79 transitions. [2021-05-02 12:26:34,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2021-05-02 12:26:34,067 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 1.0757575757575757) internal successors, (71), 65 states have internal predecessors, (71), 2 states have call successors, (4), 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 72 [2021-05-02 12:26:34,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:26:34,068 INFO L225 Difference]: With dead ends: 79 [2021-05-02 12:26:34,068 INFO L226 Difference]: Without dead ends: 74 [2021-05-02 12:26:34,068 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 73 SyntacticMatches, 1 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1895 ImplicationChecksByTransitivity, 5068.6ms TimeCoverageRelationStatistics Valid=501, Invalid=15755, Unknown=0, NotChecked=0, Total=16256 [2021-05-02 12:26:34,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-05-02 12:26:34,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 74. [2021-05-02 12:26:34,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 69 states have (on average 1.0144927536231885) internal successors, (70), 69 states have internal predecessors, (70), 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 12:26:34,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 74 transitions. [2021-05-02 12:26:34,074 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 74 transitions. Word has length 72 [2021-05-02 12:26:34,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:26:34,074 INFO L480 AbstractCegarLoop]: Abstraction has 74 states and 74 transitions. [2021-05-02 12:26:34,074 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 66 states, 66 states have (on average 1.0757575757575757) internal successors, (71), 65 states have internal predecessors, (71), 2 states have call successors, (4), 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 12:26:34,074 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 74 transitions. [2021-05-02 12:26:34,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-02 12:26:34,075 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:26:34,075 INFO L523 BasicCegarLoop]: trace histogram [62, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:26:34,288 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable67,62 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:26:34,289 INFO L428 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:26:34,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:26:34,289 INFO L82 PathProgramCache]: Analyzing trace with hash -1182461796, now seen corresponding path program 62 times [2021-05-02 12:26:34,289 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:26:34,289 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1993538905] [2021-05-02 12:26:34,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:26:34,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:26:36,337 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:26:36,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:26:36,349 INFO L134 CoverageAnalysis]: Checked inductivity of 1953 backedges. 0 proven. 1953 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:26:36,349 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:26:36,349 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1993538905] [2021-05-02 12:26:36,349 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1993538905] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:26:36,350 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [122516704] [2021-05-02 12:26:36,350 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 12:26:36,426 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:26:36,426 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:26:36,428 INFO L263 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 127 conjunts are in the unsatisfiable core [2021-05-02 12:26:36,429 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:26:36,608 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:26:36,615 INFO L134 CoverageAnalysis]: Checked inductivity of 1953 backedges. 0 proven. 1953 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:26:36,615 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [122516704] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:26:36,615 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:26:36,615 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 65] total 67 [2021-05-02 12:26:36,615 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [457711091] [2021-05-02 12:26:36,616 INFO L460 AbstractCegarLoop]: Interpolant automaton has 67 states [2021-05-02 12:26:36,616 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:26:36,616 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-05-02 12:26:36,616 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=4228, Unknown=0, NotChecked=0, Total=4422 [2021-05-02 12:26:36,616 INFO L87 Difference]: Start difference. First operand 74 states and 74 transitions. Second operand has 67 states, 67 states have (on average 1.0746268656716418) internal successors, (72), 66 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 12:26:41,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:26:41,653 INFO L93 Difference]: Finished difference Result 80 states and 80 transitions. [2021-05-02 12:26:41,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2021-05-02 12:26:41,654 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 1.0746268656716418) internal successors, (72), 66 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 12:26:41,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:26:41,655 INFO L225 Difference]: With dead ends: 80 [2021-05-02 12:26:41,655 INFO L226 Difference]: Without dead ends: 75 [2021-05-02 12:26:41,656 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 74 SyntacticMatches, 1 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1957 ImplicationChecksByTransitivity, 5183.1ms TimeCoverageRelationStatistics Valid=509, Invalid=16261, Unknown=0, NotChecked=0, Total=16770 [2021-05-02 12:26:41,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-05-02 12:26:41,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2021-05-02 12:26:41,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 70 states have (on average 1.0142857142857142) internal successors, (71), 70 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 12:26:41,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 75 transitions. [2021-05-02 12:26:41,661 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 75 transitions. Word has length 73 [2021-05-02 12:26:41,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:26:41,661 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 75 transitions. [2021-05-02 12:26:41,661 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 67 states, 67 states have (on average 1.0746268656716418) internal successors, (72), 66 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 12:26:41,661 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 75 transitions. [2021-05-02 12:26:41,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-05-02 12:26:41,662 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:26:41,662 INFO L523 BasicCegarLoop]: trace histogram [63, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:26:41,883 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable68 [2021-05-02 12:26:41,883 INFO L428 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:26:41,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:26:41,883 INFO L82 PathProgramCache]: Analyzing trace with hash 2034851254, now seen corresponding path program 63 times [2021-05-02 12:26:41,884 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:26:41,884 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1564830017] [2021-05-02 12:26:41,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:26:41,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:26:44,012 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:26:44,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:26:44,015 INFO L134 CoverageAnalysis]: Checked inductivity of 2016 backedges. 0 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:26:44,015 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:26:44,015 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1564830017] [2021-05-02 12:26:44,015 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1564830017] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:26:44,015 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1478745780] [2021-05-02 12:26:44,015 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 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 12:26:46,731 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2021-05-02 12:26:46,731 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:26:46,735 INFO L263 TraceCheckSpWp]: Trace formula consists of 274 conjuncts, 135 conjunts are in the unsatisfiable core [2021-05-02 12:26:46,736 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:26:47,380 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:26:47,388 INFO L134 CoverageAnalysis]: Checked inductivity of 2016 backedges. 0 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:26:47,388 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1478745780] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:26:47,388 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:26:47,388 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 66] total 68 [2021-05-02 12:26:47,388 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [920434319] [2021-05-02 12:26:47,389 INFO L460 AbstractCegarLoop]: Interpolant automaton has 68 states [2021-05-02 12:26:47,389 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:26:47,389 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-05-02 12:26:47,389 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=4359, Unknown=0, NotChecked=0, Total=4556 [2021-05-02 12:26:47,389 INFO L87 Difference]: Start difference. First operand 75 states and 75 transitions. Second operand has 68 states, 68 states have (on average 1.0735294117647058) internal successors, (73), 67 states have internal predecessors, (73), 2 states have call successors, (4), 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 12:26:52,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:26:52,643 INFO L93 Difference]: Finished difference Result 81 states and 81 transitions. [2021-05-02 12:26:52,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2021-05-02 12:26:52,644 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 1.0735294117647058) internal successors, (73), 67 states have internal predecessors, (73), 2 states have call successors, (4), 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 74 [2021-05-02 12:26:52,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:26:52,644 INFO L225 Difference]: With dead ends: 81 [2021-05-02 12:26:52,644 INFO L226 Difference]: Without dead ends: 76 [2021-05-02 12:26:52,645 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 70 SyntacticMatches, 6 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2030 ImplicationChecksByTransitivity, 5816.2ms TimeCoverageRelationStatistics Valid=517, Invalid=16775, Unknown=0, NotChecked=0, Total=17292 [2021-05-02 12:26:52,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-05-02 12:26:52,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2021-05-02 12:26:52,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 71 states have (on average 1.0140845070422535) internal successors, (72), 71 states have internal predecessors, (72), 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 12:26:52,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 76 transitions. [2021-05-02 12:26:52,649 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 76 transitions. Word has length 74 [2021-05-02 12:26:52,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:26:52,650 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 76 transitions. [2021-05-02 12:26:52,650 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 68 states, 68 states have (on average 1.0735294117647058) internal successors, (73), 67 states have internal predecessors, (73), 2 states have call successors, (4), 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 12:26:52,650 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 76 transitions. [2021-05-02 12:26:52,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-05-02 12:26:52,650 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:26:52,650 INFO L523 BasicCegarLoop]: trace histogram [64, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:26:52,852 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable69,64 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:26:52,853 INFO L428 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:26:52,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:26:52,853 INFO L82 PathProgramCache]: Analyzing trace with hash -1307659300, now seen corresponding path program 64 times [2021-05-02 12:26:52,853 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:26:52,853 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [950757260] [2021-05-02 12:26:52,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:26:52,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:26:55,061 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:26:55,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:26:55,066 INFO L134 CoverageAnalysis]: Checked inductivity of 2080 backedges. 0 proven. 2080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:26:55,066 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:26:55,066 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [950757260] [2021-05-02 12:26:55,066 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [950757260] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:26:55,066 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1465208313] [2021-05-02 12:26:55,066 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 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 12:26:55,139 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:26:55,139 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:26:55,141 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 131 conjunts are in the unsatisfiable core [2021-05-02 12:26:55,142 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:26:55,334 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:26:55,341 INFO L134 CoverageAnalysis]: Checked inductivity of 2080 backedges. 0 proven. 2080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:26:55,341 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1465208313] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:26:55,341 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:26:55,342 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 67] total 69 [2021-05-02 12:26:55,342 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [514222258] [2021-05-02 12:26:55,342 INFO L460 AbstractCegarLoop]: Interpolant automaton has 69 states [2021-05-02 12:26:55,342 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:26:55,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2021-05-02 12:26:55,342 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=4492, Unknown=0, NotChecked=0, Total=4692 [2021-05-02 12:26:55,342 INFO L87 Difference]: Start difference. First operand 76 states and 76 transitions. Second operand has 69 states, 69 states have (on average 1.0724637681159421) internal successors, (74), 68 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 12:27:00,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:27:00,578 INFO L93 Difference]: Finished difference Result 82 states and 82 transitions. [2021-05-02 12:27:00,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2021-05-02 12:27:00,578 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 69 states have (on average 1.0724637681159421) internal successors, (74), 68 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 12:27:00,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:27:00,579 INFO L225 Difference]: With dead ends: 82 [2021-05-02 12:27:00,579 INFO L226 Difference]: Without dead ends: 77 [2021-05-02 12:27:00,580 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 76 SyntacticMatches, 1 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2084 ImplicationChecksByTransitivity, 5540.6ms TimeCoverageRelationStatistics Valid=525, Invalid=17297, Unknown=0, NotChecked=0, Total=17822 [2021-05-02 12:27:00,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-02 12:27:00,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2021-05-02 12:27:00,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 72 states have (on average 1.0138888888888888) internal successors, (73), 72 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 12:27:00,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 77 transitions. [2021-05-02 12:27:00,583 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 77 transitions. Word has length 75 [2021-05-02 12:27:00,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:27:00,583 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 77 transitions. [2021-05-02 12:27:00,583 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 69 states, 69 states have (on average 1.0724637681159421) internal successors, (74), 68 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 12:27:00,583 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 77 transitions. [2021-05-02 12:27:00,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-02 12:27:00,584 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:27:00,584 INFO L523 BasicCegarLoop]: trace histogram [65, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:27:00,784 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70,65 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:27:00,784 INFO L428 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:27:00,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:27:00,785 INFO L82 PathProgramCache]: Analyzing trace with hash -1846271370, now seen corresponding path program 65 times [2021-05-02 12:27:00,785 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:27:00,785 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [927319573] [2021-05-02 12:27:00,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:27:00,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:27:03,021 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:27:03,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:27:03,024 INFO L134 CoverageAnalysis]: Checked inductivity of 2145 backedges. 0 proven. 2145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:27:03,024 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:27:03,024 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [927319573] [2021-05-02 12:27:03,024 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [927319573] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:27:03,024 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [578008464] [2021-05-02 12:27:03,024 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 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 12:29:15,973 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 34 check-sat command(s) [2021-05-02 12:29:15,973 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:29:16,001 WARN L261 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 192 conjunts are in the unsatisfiable core [2021-05-02 12:29:16,003 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:29:18,477 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:29:18,483 INFO L134 CoverageAnalysis]: Checked inductivity of 2145 backedges. 0 proven. 2145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:29:18,483 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [578008464] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:29:18,483 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:29:18,483 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 68] total 70 [2021-05-02 12:29:18,483 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1736804250] [2021-05-02 12:29:18,483 INFO L460 AbstractCegarLoop]: Interpolant automaton has 70 states [2021-05-02 12:29:18,483 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:29:18,484 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2021-05-02 12:29:18,484 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=203, Invalid=4627, Unknown=0, NotChecked=0, Total=4830 [2021-05-02 12:29:18,484 INFO L87 Difference]: Start difference. First operand 77 states and 77 transitions. Second operand has 70 states, 70 states have (on average 1.0714285714285714) internal successors, (75), 69 states have internal predecessors, (75), 2 states have call successors, (4), 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 12:29:24,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:29:24,026 INFO L93 Difference]: Finished difference Result 83 states and 83 transitions. [2021-05-02 12:29:24,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-05-02 12:29:24,027 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 70 states have (on average 1.0714285714285714) internal successors, (75), 69 states have internal predecessors, (75), 2 states have call successors, (4), 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 76 [2021-05-02 12:29:24,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:29:24,028 INFO L225 Difference]: With dead ends: 83 [2021-05-02 12:29:24,028 INFO L226 Difference]: Without dead ends: 78 [2021-05-02 12:29:24,029 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 19 SyntacticMatches, 59 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2265 ImplicationChecksByTransitivity, 7911.4ms TimeCoverageRelationStatistics Valid=533, Invalid=17827, Unknown=0, NotChecked=0, Total=18360 [2021-05-02 12:29:24,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-05-02 12:29:24,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2021-05-02 12:29:24,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 73 states have (on average 1.0136986301369864) internal successors, (74), 73 states have internal predecessors, (74), 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 12:29:24,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 78 transitions. [2021-05-02 12:29:24,034 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 78 transitions. Word has length 76 [2021-05-02 12:29:24,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:29:24,035 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 78 transitions. [2021-05-02 12:29:24,035 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 70 states, 70 states have (on average 1.0714285714285714) internal successors, (75), 69 states have internal predecessors, (75), 2 states have call successors, (4), 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 12:29:24,035 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 78 transitions. [2021-05-02 12:29:24,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-02 12:29:24,035 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:29:24,035 INFO L523 BasicCegarLoop]: trace histogram [66, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:29:24,247 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable71 [2021-05-02 12:29:24,247 INFO L428 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:29:24,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:29:24,248 INFO L82 PathProgramCache]: Analyzing trace with hash -1363376356, now seen corresponding path program 66 times [2021-05-02 12:29:24,248 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:29:24,248 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1178663379] [2021-05-02 12:29:24,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:29:24,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:29:26,583 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:29:26,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:29:26,586 INFO L134 CoverageAnalysis]: Checked inductivity of 2211 backedges. 0 proven. 2211 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:29:26,587 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:29:26,587 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1178663379] [2021-05-02 12:29:26,587 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1178663379] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:29:26,587 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [627207211] [2021-05-02 12:29:26,587 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 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 12:29:49,075 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 34 check-sat command(s) [2021-05-02 12:29:49,075 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:29:49,088 WARN L261 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 147 conjunts are in the unsatisfiable core [2021-05-02 12:29:49,090 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:29:49,544 INFO L134 CoverageAnalysis]: Checked inductivity of 2211 backedges. 0 proven. 2211 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:29:49,544 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [627207211] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:29:49,544 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:29:49,544 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 69] total 71 [2021-05-02 12:29:49,544 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [200811902] [2021-05-02 12:29:49,545 INFO L460 AbstractCegarLoop]: Interpolant automaton has 71 states [2021-05-02 12:29:49,545 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:29:49,545 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2021-05-02 12:29:49,545 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=206, Invalid=4764, Unknown=0, NotChecked=0, Total=4970 [2021-05-02 12:29:49,545 INFO L87 Difference]: Start difference. First operand 78 states and 78 transitions. Second operand has 71 states, 71 states have (on average 1.0704225352112675) internal successors, (76), 70 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 12:29:55,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:29:55,283 INFO L93 Difference]: Finished difference Result 84 states and 84 transitions. [2021-05-02 12:29:55,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2021-05-02 12:29:55,283 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 1.0704225352112675) internal successors, (76), 70 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 12:29:55,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:29:55,284 INFO L225 Difference]: With dead ends: 84 [2021-05-02 12:29:55,284 INFO L226 Difference]: Without dead ends: 79 [2021-05-02 12:29:55,285 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 72 SyntacticMatches, 7 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2225 ImplicationChecksByTransitivity, 6074.2ms TimeCoverageRelationStatistics Valid=541, Invalid=18365, Unknown=0, NotChecked=0, Total=18906 [2021-05-02 12:29:55,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-05-02 12:29:55,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2021-05-02 12:29:55,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 74 states have (on average 1.0135135135135136) internal successors, (75), 74 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 12:29:55,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 79 transitions. [2021-05-02 12:29:55,289 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 79 transitions. Word has length 77 [2021-05-02 12:29:55,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:29:55,289 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 79 transitions. [2021-05-02 12:29:55,289 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 71 states, 71 states have (on average 1.0704225352112675) internal successors, (76), 70 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 12:29:55,289 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 79 transitions. [2021-05-02 12:29:55,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-05-02 12:29:55,290 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:29:55,290 INFO L523 BasicCegarLoop]: trace histogram [67, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:29:55,496 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72,67 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:29:55,496 INFO L428 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:29:55,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:29:55,497 INFO L82 PathProgramCache]: Analyzing trace with hash 721467190, now seen corresponding path program 67 times [2021-05-02 12:29:55,497 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:29:55,497 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [965782420] [2021-05-02 12:29:55,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:29:55,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:29:57,930 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:29:57,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:29:57,932 INFO L134 CoverageAnalysis]: Checked inductivity of 2278 backedges. 0 proven. 2278 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:29:57,932 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:29:57,932 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [965782420] [2021-05-02 12:29:57,933 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [965782420] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:29:57,933 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [653638160] [2021-05-02 12:29:57,933 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 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 12:29:57,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:29:57,983 INFO L263 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 137 conjunts are in the unsatisfiable core [2021-05-02 12:29:57,984 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:29:58,174 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:29:58,182 INFO L134 CoverageAnalysis]: Checked inductivity of 2278 backedges. 0 proven. 2278 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:29:58,182 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [653638160] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:29:58,182 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:29:58,182 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 70] total 72 [2021-05-02 12:29:58,182 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1031901411] [2021-05-02 12:29:58,183 INFO L460 AbstractCegarLoop]: Interpolant automaton has 72 states [2021-05-02 12:29:58,183 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:29:58,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2021-05-02 12:29:58,183 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=4903, Unknown=0, NotChecked=0, Total=5112 [2021-05-02 12:29:58,183 INFO L87 Difference]: Start difference. First operand 79 states and 79 transitions. Second operand has 72 states, 72 states have (on average 1.0694444444444444) internal successors, (77), 71 states have internal predecessors, (77), 2 states have call successors, (4), 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 12:30:04,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:30:04,062 INFO L93 Difference]: Finished difference Result 85 states and 85 transitions. [2021-05-02 12:30:04,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-05-02 12:30:04,062 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 72 states have (on average 1.0694444444444444) internal successors, (77), 71 states have internal predecessors, (77), 2 states have call successors, (4), 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 78 [2021-05-02 12:30:04,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:30:04,063 INFO L225 Difference]: With dead ends: 85 [2021-05-02 12:30:04,063 INFO L226 Difference]: Without dead ends: 80 [2021-05-02 12:30:04,064 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 79 SyntacticMatches, 1 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2282 ImplicationChecksByTransitivity, 6062.8ms TimeCoverageRelationStatistics Valid=549, Invalid=18911, Unknown=0, NotChecked=0, Total=19460 [2021-05-02 12:30:04,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-05-02 12:30:04,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 80. [2021-05-02 12:30:04,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 75 states have (on average 1.0133333333333334) internal successors, (76), 75 states have internal predecessors, (76), 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 12:30:04,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 80 transitions. [2021-05-02 12:30:04,070 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 80 transitions. Word has length 78 [2021-05-02 12:30:04,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:30:04,070 INFO L480 AbstractCegarLoop]: Abstraction has 80 states and 80 transitions. [2021-05-02 12:30:04,070 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 72 states, 72 states have (on average 1.0694444444444444) internal successors, (77), 71 states have internal predecessors, (77), 2 states have call successors, (4), 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 12:30:04,070 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 80 transitions. [2021-05-02 12:30:04,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-02 12:30:04,071 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:30:04,071 INFO L523 BasicCegarLoop]: trace histogram [68, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:30:04,289 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable73,68 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:30:04,290 INFO L428 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:30:04,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:30:04,290 INFO L82 PathProgramCache]: Analyzing trace with hash 927107676, now seen corresponding path program 68 times [2021-05-02 12:30:04,290 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:30:04,290 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1015663900] [2021-05-02 12:30:04,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:30:04,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:30:06,794 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:30:06,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:30:06,796 INFO L134 CoverageAnalysis]: Checked inductivity of 2346 backedges. 0 proven. 2346 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:30:06,797 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:30:06,797 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1015663900] [2021-05-02 12:30:06,797 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1015663900] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:30:06,797 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2045754840] [2021-05-02 12:30:06,797 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 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 12:30:06,848 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:30:06,849 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:30:06,850 INFO L263 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 139 conjunts are in the unsatisfiable core [2021-05-02 12:30:06,851 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:30:07,053 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:30:07,059 INFO L134 CoverageAnalysis]: Checked inductivity of 2346 backedges. 0 proven. 2346 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:30:07,059 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2045754840] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:30:07,059 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:30:07,059 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 71] total 73 [2021-05-02 12:30:07,060 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1139186755] [2021-05-02 12:30:07,060 INFO L460 AbstractCegarLoop]: Interpolant automaton has 73 states [2021-05-02 12:30:07,060 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:30:07,060 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-05-02 12:30:07,060 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=5044, Unknown=0, NotChecked=0, Total=5256 [2021-05-02 12:30:07,060 INFO L87 Difference]: Start difference. First operand 80 states and 80 transitions. Second operand has 73 states, 73 states have (on average 1.0684931506849316) internal successors, (78), 72 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 12:30:13,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:30:13,093 INFO L93 Difference]: Finished difference Result 86 states and 86 transitions. [2021-05-02 12:30:13,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2021-05-02 12:30:13,094 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 1.0684931506849316) internal successors, (78), 72 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 12:30:13,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:30:13,094 INFO L225 Difference]: With dead ends: 86 [2021-05-02 12:30:13,094 INFO L226 Difference]: Without dead ends: 81 [2021-05-02 12:30:13,095 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 80 SyntacticMatches, 1 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2350 ImplicationChecksByTransitivity, 6194.1ms TimeCoverageRelationStatistics Valid=557, Invalid=19465, Unknown=0, NotChecked=0, Total=20022 [2021-05-02 12:30:13,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-05-02 12:30:13,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2021-05-02 12:30:13,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 76 states have (on average 1.013157894736842) internal successors, (77), 76 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 12:30:13,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 81 transitions. [2021-05-02 12:30:13,101 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 81 transitions. Word has length 79 [2021-05-02 12:30:13,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:30:13,101 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 81 transitions. [2021-05-02 12:30:13,101 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 73 states, 73 states have (on average 1.0684931506849316) internal successors, (78), 72 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 12:30:13,102 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 81 transitions. [2021-05-02 12:30:13,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-05-02 12:30:13,102 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:30:13,102 INFO L523 BasicCegarLoop]: trace histogram [69, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:30:13,324 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 69 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable74 [2021-05-02 12:30:13,325 INFO L428 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:30:13,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:30:13,325 INFO L82 PathProgramCache]: Analyzing trace with hash -1287971850, now seen corresponding path program 69 times [2021-05-02 12:30:13,325 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:30:13,325 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [836450306] [2021-05-02 12:30:13,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:30:13,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:30:15,885 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:30:15,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:30:15,888 INFO L134 CoverageAnalysis]: Checked inductivity of 2415 backedges. 0 proven. 2415 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:30:15,888 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:30:15,888 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [836450306] [2021-05-02 12:30:15,888 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [836450306] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:30:15,888 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1337726115] [2021-05-02 12:30:15,888 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 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 12:30:22,010 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2021-05-02 12:30:22,010 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:30:22,016 WARN L261 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 147 conjunts are in the unsatisfiable core [2021-05-02 12:30:22,017 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:30:22,272 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:30:22,273 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:30:22,276 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:30:22,415 INFO L134 CoverageAnalysis]: Checked inductivity of 2415 backedges. 0 proven. 2415 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:30:22,415 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1337726115] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:30:22,415 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:30:22,415 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 74] total 76 [2021-05-02 12:30:22,415 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2101586435] [2021-05-02 12:30:22,415 INFO L460 AbstractCegarLoop]: Interpolant automaton has 76 states [2021-05-02 12:30:22,415 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:30:22,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2021-05-02 12:30:22,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=219, Invalid=5481, Unknown=0, NotChecked=0, Total=5700 [2021-05-02 12:30:22,416 INFO L87 Difference]: Start difference. First operand 81 states and 81 transitions. Second operand has 76 states, 76 states have (on average 1.0657894736842106) internal successors, (81), 74 states have internal predecessors, (81), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:30:28,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:30:28,738 INFO L93 Difference]: Finished difference Result 87 states and 87 transitions. [2021-05-02 12:30:28,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2021-05-02 12:30:28,739 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 76 states have (on average 1.0657894736842106) internal successors, (81), 74 states have internal predecessors, (81), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 80 [2021-05-02 12:30:28,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:30:28,739 INFO L225 Difference]: With dead ends: 87 [2021-05-02 12:30:28,740 INFO L226 Difference]: Without dead ends: 82 [2021-05-02 12:30:28,740 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 78 SyntacticMatches, 2 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2425 ImplicationChecksByTransitivity, 6614.0ms TimeCoverageRelationStatistics Valid=569, Invalid=20601, Unknown=0, NotChecked=0, Total=21170 [2021-05-02 12:30:28,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-05-02 12:30:28,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2021-05-02 12:30:28,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 77 states have (on average 1.0129870129870129) internal successors, (78), 77 states have internal predecessors, (78), 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 12:30:28,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 82 transitions. [2021-05-02 12:30:28,745 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 82 transitions. Word has length 80 [2021-05-02 12:30:28,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:30:28,745 INFO L480 AbstractCegarLoop]: Abstraction has 82 states and 82 transitions. [2021-05-02 12:30:28,745 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 76 states, 76 states have (on average 1.0657894736842106) internal successors, (81), 74 states have internal predecessors, (81), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:30:28,745 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 82 transitions. [2021-05-02 12:30:28,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-05-02 12:30:28,745 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:30:28,745 INFO L523 BasicCegarLoop]: trace histogram [70, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:30:28,945 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable75,70 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:30:28,946 INFO L428 AbstractCegarLoop]: === Iteration 72 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:30:28,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:30:28,946 INFO L82 PathProgramCache]: Analyzing trace with hash -1235960420, now seen corresponding path program 70 times [2021-05-02 12:30:28,946 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:30:28,946 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1675754317] [2021-05-02 12:30:28,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:30:28,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:30:31,567 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:30:31,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:30:31,570 INFO L134 CoverageAnalysis]: Checked inductivity of 2485 backedges. 0 proven. 2485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:30:31,570 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:30:31,570 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1675754317] [2021-05-02 12:30:31,570 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1675754317] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:30:31,570 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2043962525] [2021-05-02 12:30:31,570 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 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 12:30:31,630 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:30:31,630 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:30:31,632 INFO L263 TraceCheckSpWp]: Trace formula consists of 295 conjuncts, 143 conjunts are in the unsatisfiable core [2021-05-02 12:30:31,633 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:30:31,831 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:30:31,838 INFO L134 CoverageAnalysis]: Checked inductivity of 2485 backedges. 0 proven. 2485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:30:31,838 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2043962525] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:30:31,838 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:30:31,838 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [74, 73] total 75 [2021-05-02 12:30:31,838 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1292389708] [2021-05-02 12:30:31,838 INFO L460 AbstractCegarLoop]: Interpolant automaton has 75 states [2021-05-02 12:30:31,838 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:30:31,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2021-05-02 12:30:31,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=218, Invalid=5332, Unknown=0, NotChecked=0, Total=5550 [2021-05-02 12:30:31,839 INFO L87 Difference]: Start difference. First operand 82 states and 82 transitions. Second operand has 75 states, 75 states have (on average 1.0666666666666667) internal successors, (80), 74 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 12:30:38,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:30:38,234 INFO L93 Difference]: Finished difference Result 88 states and 88 transitions. [2021-05-02 12:30:38,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2021-05-02 12:30:38,234 INFO L78 Accepts]: Start accepts. Automaton has has 75 states, 75 states have (on average 1.0666666666666667) internal successors, (80), 74 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 12:30:38,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:30:38,235 INFO L225 Difference]: With dead ends: 88 [2021-05-02 12:30:38,235 INFO L226 Difference]: Without dead ends: 83 [2021-05-02 12:30:38,235 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 227 GetRequests, 82 SyntacticMatches, 1 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2489 ImplicationChecksByTransitivity, 6495.1ms TimeCoverageRelationStatistics Valid=573, Invalid=20597, Unknown=0, NotChecked=0, Total=21170 [2021-05-02 12:30:38,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-05-02 12:30:38,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2021-05-02 12:30:38,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 78 states have (on average 1.0128205128205128) internal successors, (79), 78 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 12:30:38,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 83 transitions. [2021-05-02 12:30:38,239 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 83 transitions. Word has length 81 [2021-05-02 12:30:38,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:30:38,239 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 83 transitions. [2021-05-02 12:30:38,240 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 75 states, 75 states have (on average 1.0666666666666667) internal successors, (80), 74 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 12:30:38,240 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 83 transitions. [2021-05-02 12:30:38,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-02 12:30:38,240 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:30:38,240 INFO L523 BasicCegarLoop]: trace histogram [71, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:30:38,441 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 71 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable77 [2021-05-02 12:30:38,441 INFO L428 AbstractCegarLoop]: === Iteration 73 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:30:38,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:30:38,441 INFO L82 PathProgramCache]: Analyzing trace with hash 376393910, now seen corresponding path program 71 times [2021-05-02 12:30:38,441 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:30:38,442 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [90253050] [2021-05-02 12:30:38,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:30:38,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:30:41,132 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:30:41,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:30:41,135 INFO L134 CoverageAnalysis]: Checked inductivity of 2556 backedges. 0 proven. 2556 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:30:41,135 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:30:41,135 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [90253050] [2021-05-02 12:30:41,135 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [90253050] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:30:41,135 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [750350104] [2021-05-02 12:30:41,135 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