/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/Mono5_1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 12:49:37,359 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 12:49:37,360 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 12:49:37,385 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 12:49:37,398 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 12:49:37,398 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 12:49:37,399 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 12:49:37,400 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 12:49:37,400 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 12:49:37,401 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 12:49:37,402 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 12:49:37,403 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 12:49:37,404 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 12:49:37,406 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 12:49:37,406 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 12:49:37,407 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 12:49:37,414 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 12:49:37,433 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 12:49:37,433 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 12:49:37,434 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 12:49:37,438 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 12:49:37,475 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 12:49:37,475 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 12:49:37,476 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 12:49:37,476 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 12:49:37,476 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 12:49:37,477 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 12:49:37,477 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 12:49:37,477 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 12:49:37,477 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 12:49:37,477 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 12:49:37,477 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 12:49:37,477 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 12:49:37,477 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 12:49:37,477 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 12:49:37,478 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 12:49:37,478 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 12:49:37,478 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 12:49:37,478 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 12:49:37,478 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 12:49:37,478 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 12:49:37,478 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 12:49:37,478 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 12:49:37,478 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 12:49:37,478 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 12:49:37,479 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 12:49:37,479 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 12:49:37,479 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 12:49:37,479 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 12:49:37,479 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 12:49:37,780 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 12:49:37,800 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 12:49:37,802 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 12:49:37,803 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 12:49:37,804 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 12:49:37,804 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/Mono5_1.c [2021-05-02 12:49:37,861 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2a584fbac/600f85d16b404748a876f3c8e05cba02/FLAG936b22fe4 [2021-05-02 12:49:38,279 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 12:49:38,280 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/Mono5_1.c [2021-05-02 12:49:38,285 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2a584fbac/600f85d16b404748a876f3c8e05cba02/FLAG936b22fe4 [2021-05-02 12:49:38,695 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2a584fbac/600f85d16b404748a876f3c8e05cba02 [2021-05-02 12:49:38,697 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 12:49:38,698 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 12:49:38,701 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 12:49:38,704 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 12:49:38,707 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 12:49:38,708 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 12:49:38" (1/1) ... [2021-05-02 12:49:38,709 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@281e61ff and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:49:38, skipping insertion in model container [2021-05-02 12:49:38,709 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 12:49:38" (1/1) ... [2021-05-02 12:49:38,715 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 12:49:38,724 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 12:49:38,811 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/Mono5_1.c[311,324] [2021-05-02 12:49:38,818 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 12:49:38,824 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 12:49:38,832 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/Mono5_1.c[311,324] [2021-05-02 12:49:38,834 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 12:49:38,844 INFO L208 MainTranslator]: Completed translation [2021-05-02 12:49:38,845 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:49:38 WrapperNode [2021-05-02 12:49:38,845 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 12:49:38,846 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 12:49:38,846 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 12:49:38,846 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 12:49:38,853 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:49:38" (1/1) ... [2021-05-02 12:49:38,854 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:49:38" (1/1) ... [2021-05-02 12:49:38,858 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:49:38" (1/1) ... [2021-05-02 12:49:38,858 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:49:38" (1/1) ... [2021-05-02 12:49:38,861 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:49:38" (1/1) ... [2021-05-02 12:49:38,885 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:49:38" (1/1) ... [2021-05-02 12:49:38,890 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:49:38" (1/1) ... [2021-05-02 12:49:38,891 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 12:49:38,905 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 12:49:38,906 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 12:49:38,906 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 12:49:38,907 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:49:38" (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 12:49:38,984 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 12:49:38,985 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 12:49:38,985 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 12:49:38,985 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 12:49:38,985 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 12:49:38,985 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 12:49:38,985 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 12:49:38,986 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 12:49:38,986 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 12:49:38,986 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 12:49:38,986 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 12:49:38,986 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 12:49:38,987 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 12:49:38,987 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 12:49:38,987 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 12:49:38,987 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 12:49:38,987 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 12:49:39,222 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 12:49:39,223 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 12:49:39,224 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 12:49:39 BoogieIcfgContainer [2021-05-02 12:49:39,224 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 12:49:39,225 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 12:49:39,225 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 12:49:39,227 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 12:49:39,227 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 12:49:38" (1/3) ... [2021-05-02 12:49:39,228 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@114665d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 12:49:39, skipping insertion in model container [2021-05-02 12:49:39,228 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:49:38" (2/3) ... [2021-05-02 12:49:39,228 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@114665d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 12:49:39, skipping insertion in model container [2021-05-02 12:49:39,228 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 12:49:39" (3/3) ... [2021-05-02 12:49:39,238 INFO L111 eAbstractionObserver]: Analyzing ICFG Mono5_1.c [2021-05-02 12:49:39,242 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 12:49:39,261 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 12:49:39,274 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 12:49:39,292 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 12:49:39,293 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 12:49:39,293 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 12:49:39,293 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 12:49:39,293 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 12:49:39,293 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 12:49:39,293 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 12:49:39,293 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 12:49:39,309 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 12:49:39,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 12:49:39,312 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:49:39,313 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:49:39,313 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:49:39,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:49:39,318 INFO L82 PathProgramCache]: Analyzing trace with hash 1326077006, now seen corresponding path program 1 times [2021-05-02 12:49:39,324 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:49:39,325 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1584626149] [2021-05-02 12:49:39,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:49:39,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:39,535 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:49:39,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:39,566 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 12:49:39,566 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:49:39,567 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1584626149] [2021-05-02 12:49:39,567 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1584626149] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 12:49:39,568 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 12:49:39,568 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 12:49:39,568 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [583374804] [2021-05-02 12:49:39,571 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 12:49:39,571 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:49:39,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 12:49:39,582 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 12:49:39,584 INFO L87 Difference]: Start difference. First operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 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 12:49:39,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:49:39,643 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2021-05-02 12:49:39,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 12:49:39,645 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 12:49:39,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:49:39,651 INFO L225 Difference]: With dead ends: 31 [2021-05-02 12:49:39,652 INFO L226 Difference]: Without dead ends: 14 [2021-05-02 12:49:39,655 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 60.9ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 12:49:39,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-05-02 12:49:39,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-05-02 12:49:39,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:39,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2021-05-02 12:49:39,689 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 11 [2021-05-02 12:49:39,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:49:39,690 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2021-05-02 12:49:39,690 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 12:49:39,690 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2021-05-02 12:49:39,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 12:49:39,691 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:49:39,691 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:49:39,691 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 12:49:39,691 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:49:39,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:49:39,692 INFO L82 PathProgramCache]: Analyzing trace with hash 1315918275, now seen corresponding path program 1 times [2021-05-02 12:49:39,692 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:49:39,692 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [908011136] [2021-05-02 12:49:39,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:49:39,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:39,800 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:49:39,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:39,809 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 12:49:39,809 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:49:39,809 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [908011136] [2021-05-02 12:49:39,809 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [908011136] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 12:49:39,809 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 12:49:39,809 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 12:49:39,810 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [845803043] [2021-05-02 12:49:39,810 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 12:49:39,811 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:49:39,811 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 12:49:39,811 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 12:49:39,811 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 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 12:49:40,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:49:40,021 INFO L93 Difference]: Finished difference Result 22 states and 24 transitions. [2021-05-02 12:49:40,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 12:49:40,022 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 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 12:49:40,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:49:40,022 INFO L225 Difference]: With dead ends: 22 [2021-05-02 12:49:40,022 INFO L226 Difference]: Without dead ends: 17 [2021-05-02 12:49:40,023 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 192.9ms TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-05-02 12:49:40,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-02 12:49:40,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-05-02 12:49:40,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.25) internal successors, (15), 12 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 12:49:40,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2021-05-02 12:49:40,028 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 11 [2021-05-02 12:49:40,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:49:40,028 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2021-05-02 12:49:40,029 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 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 12:49:40,029 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2021-05-02 12:49:40,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 12:49:40,029 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:49:40,029 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:49:40,029 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 12:49:40,029 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:49:40,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:49:40,030 INFO L82 PathProgramCache]: Analyzing trace with hash 644646283, now seen corresponding path program 1 times [2021-05-02 12:49:40,030 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:49:40,030 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1239578351] [2021-05-02 12:49:40,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:49:40,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:40,113 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:49:40,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:40,124 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:49:40,124 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:49:40,124 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1239578351] [2021-05-02 12:49:40,125 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1239578351] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 12:49:40,125 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 12:49:40,125 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 12:49:40,125 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1702236804] [2021-05-02 12:49:40,125 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 12:49:40,126 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:49:40,126 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 12:49:40,126 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 12:49:40,126 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 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 12:49:40,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:49:40,196 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2021-05-02 12:49:40,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 12:49:40,196 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 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 14 [2021-05-02 12:49:40,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:49:40,197 INFO L225 Difference]: With dead ends: 28 [2021-05-02 12:49:40,197 INFO L226 Difference]: Without dead ends: 20 [2021-05-02 12:49:40,198 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 2 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 63.6ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 12:49:40,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-05-02 12:49:40,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2021-05-02 12:49:40,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:40,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2021-05-02 12:49:40,210 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 14 [2021-05-02 12:49:40,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:49:40,210 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2021-05-02 12:49:40,210 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 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 12:49:40,210 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2021-05-02 12:49:40,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 12:49:40,211 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:49:40,211 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:49:40,211 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 12:49:40,211 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:49:40,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:49:40,212 INFO L82 PathProgramCache]: Analyzing trace with hash -244564223, now seen corresponding path program 1 times [2021-05-02 12:49:40,212 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:49:40,212 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [20966953] [2021-05-02 12:49:40,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:49:40,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:40,321 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:49:40,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:40,346 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:49:40,346 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:49:40,346 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [20966953] [2021-05-02 12:49:40,346 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [20966953] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:40,347 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1643655739] [2021-05-02 12:49:40,347 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 12:49:40,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:40,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 12:49:40,407 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:49:40,486 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:49:40,487 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1643655739] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:40,487 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:49:40,487 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-02 12:49:40,487 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1998561471] [2021-05-02 12:49:40,488 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 12:49:40,488 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:49:40,488 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 12:49:40,488 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 12:49:40,488 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 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 12:49:40,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:49:40,602 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2021-05-02 12:49:40,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 12:49:40,603 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 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 17 [2021-05-02 12:49:40,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:49:40,604 INFO L225 Difference]: With dead ends: 31 [2021-05-02 12:49:40,604 INFO L226 Difference]: Without dead ends: 23 [2021-05-02 12:49:40,605 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 114.5ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-02 12:49:40,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-02 12:49:40,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2021-05-02 12:49:40,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 17 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 12:49:40,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2021-05-02 12:49:40,613 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 17 [2021-05-02 12:49:40,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:49:40,613 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2021-05-02 12:49:40,614 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 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 12:49:40,614 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2021-05-02 12:49:40,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 12:49:40,614 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:49:40,615 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:49:40,828 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:49:40,829 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:49:40,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:49:40,830 INFO L82 PathProgramCache]: Analyzing trace with hash 643533259, now seen corresponding path program 2 times [2021-05-02 12:49:40,830 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:49:40,830 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2110869845] [2021-05-02 12:49:40,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:49:40,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:40,921 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:49:40,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:40,935 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:49:40,935 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:49:40,935 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2110869845] [2021-05-02 12:49:40,935 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2110869845] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:40,935 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [69877656] [2021-05-02 12:49:40,935 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 12:49:40,981 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:49:40,981 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:49:40,982 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 12:49:40,983 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:49:41,059 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:49:41,081 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:49:41,082 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [69877656] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:41,082 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:49:41,082 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 12:49:41,083 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [720446050] [2021-05-02 12:49:41,083 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 12:49:41,084 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:49:41,084 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 12:49:41,085 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-02 12:49:41,086 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 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 12:49:41,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:49:41,192 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2021-05-02 12:49:41,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 12:49:41,193 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 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 20 [2021-05-02 12:49:41,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:49:41,193 INFO L225 Difference]: With dead ends: 34 [2021-05-02 12:49:41,193 INFO L226 Difference]: Without dead ends: 26 [2021-05-02 12:49:41,194 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 111.7ms TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-05-02 12:49:41,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-05-02 12:49:41,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2021-05-02 12:49:41,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.15) internal successors, (23), 20 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:41,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2021-05-02 12:49:41,197 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 20 [2021-05-02 12:49:41,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:49:41,198 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2021-05-02 12:49:41,198 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 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 12:49:41,198 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2021-05-02 12:49:41,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 12:49:41,198 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:49:41,198 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:49:41,417 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:49:41,418 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:49:41,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:49:41,418 INFO L82 PathProgramCache]: Analyzing trace with hash 957076161, now seen corresponding path program 3 times [2021-05-02 12:49:41,418 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:49:41,419 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1195706737] [2021-05-02 12:49:41,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:49:41,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:41,539 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:49:41,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:41,553 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 7 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:49:41,553 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:49:41,554 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1195706737] [2021-05-02 12:49:41,554 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1195706737] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:41,554 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [463309538] [2021-05-02 12:49:41,554 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 12:49:41,603 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 12:49:41,603 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:49:41,604 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 12:49:41,606 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:49:41,698 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 12:49:41,698 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [463309538] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:41,699 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:49:41,699 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 11 [2021-05-02 12:49:41,699 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [591341215] [2021-05-02 12:49:41,699 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 12:49:41,699 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:49:41,700 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 12:49:41,700 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2021-05-02 12:49:41,700 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand has 11 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 9 states have internal predecessors, (29), 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 12:49:41,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:49:41,998 INFO L93 Difference]: Finished difference Result 43 states and 49 transitions. [2021-05-02 12:49:41,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 12:49:41,998 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 9 states have internal predecessors, (29), 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 23 [2021-05-02 12:49:41,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:49:41,999 INFO L225 Difference]: With dead ends: 43 [2021-05-02 12:49:41,999 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 12:49:41,999 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 285.9ms TimeCoverageRelationStatistics Valid=70, Invalid=272, Unknown=0, NotChecked=0, Total=342 [2021-05-02 12:49:42,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 12:49:42,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2021-05-02 12:49:42,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.1538461538461537) internal successors, (30), 26 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 12:49:42,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 34 transitions. [2021-05-02 12:49:42,004 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 34 transitions. Word has length 23 [2021-05-02 12:49:42,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:49:42,004 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 34 transitions. [2021-05-02 12:49:42,004 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 9 states have internal predecessors, (29), 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 12:49:42,004 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 34 transitions. [2021-05-02 12:49:42,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 12:49:42,005 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:49:42,005 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:49:42,218 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:49:42,218 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:49:42,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:49:42,219 INFO L82 PathProgramCache]: Analyzing trace with hash 92976195, now seen corresponding path program 4 times [2021-05-02 12:49:42,219 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:49:42,219 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1119535884] [2021-05-02 12:49:42,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:49:42,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:42,312 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:49:42,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:42,322 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 23 proven. 26 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 12:49:42,324 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:49:42,324 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1119535884] [2021-05-02 12:49:42,324 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1119535884] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:42,325 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1752533893] [2021-05-02 12:49:42,325 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 12:49:42,379 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:49:42,379 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:49:42,380 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 12:49:42,382 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:49:42,455 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:49:42,466 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 23 proven. 26 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 12:49:42,466 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1752533893] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:42,466 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:49:42,466 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-02 12:49:42,466 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1903215113] [2021-05-02 12:49:42,467 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 12:49:42,467 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:49:42,467 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 12:49:42,467 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-05-02 12:49:42,468 INFO L87 Difference]: Start difference. First operand 31 states and 34 transitions. Second operand has 9 states, 9 states have (on average 3.111111111111111) internal successors, (28), 8 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 12:49:42,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:49:42,636 INFO L93 Difference]: Finished difference Result 46 states and 52 transitions. [2021-05-02 12:49:42,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 12:49:42,637 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.111111111111111) internal successors, (28), 8 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 12:49:42,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:49:42,637 INFO L225 Difference]: With dead ends: 46 [2021-05-02 12:49:42,637 INFO L226 Difference]: Without dead ends: 35 [2021-05-02 12:49:42,638 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 141.8ms TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2021-05-02 12:49:42,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-02 12:49:42,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2021-05-02 12:49:42,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.1379310344827587) internal successors, (33), 29 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 12:49:42,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 37 transitions. [2021-05-02 12:49:42,642 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 37 transitions. Word has length 29 [2021-05-02 12:49:42,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:49:42,643 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 37 transitions. [2021-05-02 12:49:42,643 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.111111111111111) internal successors, (28), 8 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 12:49:42,643 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 37 transitions. [2021-05-02 12:49:42,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 12:49:42,643 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:49:42,643 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:49:42,860 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:49:42,861 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:49:42,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:49:42,862 INFO L82 PathProgramCache]: Analyzing trace with hash 1597906957, now seen corresponding path program 5 times [2021-05-02 12:49:42,862 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:49:42,862 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [864805583] [2021-05-02 12:49:42,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:49:42,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:42,953 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:49:42,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:42,960 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 28 proven. 40 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 12:49:42,960 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:49:42,960 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [864805583] [2021-05-02 12:49:42,960 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [864805583] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:42,960 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1009466310] [2021-05-02 12:49:42,960 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 12:49:43,083 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2021-05-02 12:49:43,083 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:49:43,084 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 12:49:43,085 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:49:43,201 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:49:43,209 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 13 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:49:43,209 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1009466310] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:43,210 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:49:43,210 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 11 [2021-05-02 12:49:43,210 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [594572167] [2021-05-02 12:49:43,210 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 12:49:43,210 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:49:43,211 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 12:49:43,211 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-02 12:49:43,211 INFO L87 Difference]: Start difference. First operand 34 states and 37 transitions. Second operand has 11 states, 11 states have (on average 3.090909090909091) internal successors, (34), 10 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 12:49:43,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:49:43,448 INFO L93 Difference]: Finished difference Result 52 states and 59 transitions. [2021-05-02 12:49:43,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 12:49:43,448 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.090909090909091) internal successors, (34), 10 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 32 [2021-05-02 12:49:43,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:49:43,449 INFO L225 Difference]: With dead ends: 52 [2021-05-02 12:49:43,449 INFO L226 Difference]: Without dead ends: 41 [2021-05-02 12:49:43,449 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 28 SyntacticMatches, 6 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 229.4ms TimeCoverageRelationStatistics Valid=59, Invalid=247, Unknown=0, NotChecked=0, Total=306 [2021-05-02 12:49:43,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-05-02 12:49:43,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 40. [2021-05-02 12:49:43,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 35 states have (on average 1.1142857142857143) internal successors, (39), 35 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 12:49:43,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2021-05-02 12:49:43,454 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 32 [2021-05-02 12:49:43,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:49:43,454 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2021-05-02 12:49:43,454 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.090909090909091) internal successors, (34), 10 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 12:49:43,454 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2021-05-02 12:49:43,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 12:49:43,455 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:49:43,455 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:49:43,662 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:49:43,662 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:49:43,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:49:43,663 INFO L82 PathProgramCache]: Analyzing trace with hash -175336371, now seen corresponding path program 6 times [2021-05-02 12:49:43,663 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:49:43,663 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [511559735] [2021-05-02 12:49:43,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:49:43,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:43,775 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:49:43,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:43,783 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 38 proven. 77 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 12:49:43,784 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:49:43,784 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [511559735] [2021-05-02 12:49:43,784 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [511559735] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:43,784 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1757031916] [2021-05-02 12:49:43,784 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 12:49:43,860 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-05-02 12:49:43,861 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:49:43,861 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-02 12:49:43,863 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:49:43,957 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 12:49:43,957 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1757031916] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:43,957 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:49:43,957 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 7] total 16 [2021-05-02 12:49:43,957 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [362339665] [2021-05-02 12:49:43,958 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 12:49:43,958 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:49:43,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 12:49:43,959 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=204, Unknown=0, NotChecked=0, Total=240 [2021-05-02 12:49:43,959 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand has 16 states, 16 states have (on average 2.875) internal successors, (46), 14 states have internal predecessors, (46), 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 12:49:44,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:49:44,480 INFO L93 Difference]: Finished difference Result 61 states and 69 transitions. [2021-05-02 12:49:44,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 12:49:44,482 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.875) internal successors, (46), 14 states have internal predecessors, (46), 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 38 [2021-05-02 12:49:44,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:49:44,484 INFO L225 Difference]: With dead ends: 61 [2021-05-02 12:49:44,484 INFO L226 Difference]: Without dead ends: 47 [2021-05-02 12:49:44,484 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 423.2ms TimeCoverageRelationStatistics Valid=120, Invalid=692, Unknown=0, NotChecked=0, Total=812 [2021-05-02 12:49:44,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-05-02 12:49:44,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 46. [2021-05-02 12:49:44,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.1219512195121952) internal successors, (46), 41 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 12:49:44,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2021-05-02 12:49:44,502 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 38 [2021-05-02 12:49:44,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:49:44,502 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2021-05-02 12:49:44,502 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.875) internal successors, (46), 14 states have internal predecessors, (46), 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 12:49:44,503 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2021-05-02 12:49:44,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-02 12:49:44,506 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:49:44,506 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 8, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:49:44,718 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:49:44,719 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:49:44,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:49:44,719 INFO L82 PathProgramCache]: Analyzing trace with hash -927151221, now seen corresponding path program 7 times [2021-05-02 12:49:44,719 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:49:44,720 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2028296767] [2021-05-02 12:49:44,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:49:44,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:44,864 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:49:44,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:44,874 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 69 proven. 100 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 12:49:44,875 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:49:44,875 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2028296767] [2021-05-02 12:49:44,875 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2028296767] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:44,875 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [688099053] [2021-05-02 12:49:44,875 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 12:49:44,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:44,953 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 12:49:44,965 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:49:45,041 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:49:45,054 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 69 proven. 100 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 12:49:45,055 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [688099053] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:45,055 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:49:45,055 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2021-05-02 12:49:45,055 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1066724882] [2021-05-02 12:49:45,055 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 12:49:45,056 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:49:45,056 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 12:49:45,056 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-02 12:49:45,056 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand has 13 states, 13 states have (on average 3.076923076923077) internal successors, (40), 12 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 12:49:45,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:49:45,365 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2021-05-02 12:49:45,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 12:49:45,366 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.076923076923077) internal successors, (40), 12 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 44 [2021-05-02 12:49:45,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:49:45,368 INFO L225 Difference]: With dead ends: 64 [2021-05-02 12:49:45,368 INFO L226 Difference]: Without dead ends: 50 [2021-05-02 12:49:45,368 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 278.1ms TimeCoverageRelationStatistics Valid=77, Invalid=385, Unknown=0, NotChecked=0, Total=462 [2021-05-02 12:49:45,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-05-02 12:49:45,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2021-05-02 12:49:45,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 44 states have (on average 1.1136363636363635) internal successors, (49), 44 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 12:49:45,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 53 transitions. [2021-05-02 12:49:45,381 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 53 transitions. Word has length 44 [2021-05-02 12:49:45,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:49:45,381 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 53 transitions. [2021-05-02 12:49:45,381 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 3.076923076923077) internal successors, (40), 12 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 12:49:45,381 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 53 transitions. [2021-05-02 12:49:45,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 12:49:45,385 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:49:45,386 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 9, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:49:45,607 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 12:49:45,608 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:49:45,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:49:45,608 INFO L82 PathProgramCache]: Analyzing trace with hash 1736381057, now seen corresponding path program 8 times [2021-05-02 12:49:45,608 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:49:45,608 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [862403478] [2021-05-02 12:49:45,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:49:45,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:45,782 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:49:45,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:45,788 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 77 proven. 126 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 12:49:45,788 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:49:45,789 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [862403478] [2021-05-02 12:49:45,789 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [862403478] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:45,789 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1000632550] [2021-05-02 12:49:45,789 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 12:49:45,835 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:49:45,836 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:49:45,837 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 12:49:45,842 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:49:45,911 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:49:45,924 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 77 proven. 126 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 12:49:45,924 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1000632550] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:45,924 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:49:45,925 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2021-05-02 12:49:45,925 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1257539479] [2021-05-02 12:49:45,925 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 12:49:45,925 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:49:45,926 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 12:49:45,926 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-02 12:49:45,926 INFO L87 Difference]: Start difference. First operand 49 states and 53 transitions. Second operand has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 13 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:46,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:49:46,280 INFO L93 Difference]: Finished difference Result 67 states and 75 transitions. [2021-05-02 12:49:46,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 12:49:46,281 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 13 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 47 [2021-05-02 12:49:46,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:49:46,282 INFO L225 Difference]: With dead ends: 67 [2021-05-02 12:49:46,282 INFO L226 Difference]: Without dead ends: 53 [2021-05-02 12:49:46,282 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 312.3ms TimeCoverageRelationStatistics Valid=85, Invalid=467, Unknown=0, NotChecked=0, Total=552 [2021-05-02 12:49:46,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-02 12:49:46,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 52. [2021-05-02 12:49:46,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 47 states have (on average 1.1063829787234043) internal successors, (52), 47 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 12:49:46,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 56 transitions. [2021-05-02 12:49:46,286 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 56 transitions. Word has length 47 [2021-05-02 12:49:46,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:49:46,287 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 56 transitions. [2021-05-02 12:49:46,287 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 13 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:46,287 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 56 transitions. [2021-05-02 12:49:46,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-02 12:49:46,287 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:49:46,287 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 10, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:49:46,501 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-05-02 12:49:46,502 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:49:46,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:49:46,502 INFO L82 PathProgramCache]: Analyzing trace with hash 1505681355, now seen corresponding path program 9 times [2021-05-02 12:49:46,502 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:49:46,502 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1465617840] [2021-05-02 12:49:46,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:49:46,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:46,687 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:49:46,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:46,691 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 85 proven. 155 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 12:49:46,691 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:49:46,692 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1465617840] [2021-05-02 12:49:46,692 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1465617840] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:46,692 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [320829525] [2021-05-02 12:49:46,692 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 12:49:46,757 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-05-02 12:49:46,757 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:49:46,758 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 12:49:46,759 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:49:46,895 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 12:49:46,895 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [320829525] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:46,896 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:49:46,896 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 8] total 20 [2021-05-02 12:49:46,896 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [38788903] [2021-05-02 12:49:46,896 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 12:49:46,896 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:49:46,897 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 12:49:46,897 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=333, Unknown=0, NotChecked=0, Total=380 [2021-05-02 12:49:46,897 INFO L87 Difference]: Start difference. First operand 52 states and 56 transitions. Second operand has 20 states, 20 states have (on average 2.9) internal successors, (58), 18 states have internal predecessors, (58), 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 12:49:47,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:49:47,669 INFO L93 Difference]: Finished difference Result 76 states and 86 transitions. [2021-05-02 12:49:47,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 12:49:47,670 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.9) internal successors, (58), 18 states have internal predecessors, (58), 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 50 [2021-05-02 12:49:47,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:49:47,670 INFO L225 Difference]: With dead ends: 76 [2021-05-02 12:49:47,670 INFO L226 Difference]: Without dead ends: 59 [2021-05-02 12:49:47,671 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 626.1ms TimeCoverageRelationStatistics Valid=159, Invalid=1173, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 12:49:47,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-05-02 12:49:47,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 58. [2021-05-02 12:49:47,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 53 states have (on average 1.1132075471698113) internal successors, (59), 53 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 12:49:47,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 63 transitions. [2021-05-02 12:49:47,675 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 63 transitions. Word has length 50 [2021-05-02 12:49:47,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:49:47,675 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 63 transitions. [2021-05-02 12:49:47,675 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 2.9) internal successors, (58), 18 states have internal predecessors, (58), 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 12:49:47,676 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 63 transitions. [2021-05-02 12:49:47,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-05-02 12:49:47,676 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:49:47,676 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 11, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:49:47,881 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:49:47,881 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:49:47,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:49:47,882 INFO L82 PathProgramCache]: Analyzing trace with hash 340592717, now seen corresponding path program 10 times [2021-05-02 12:49:47,882 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:49:47,882 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1973509688] [2021-05-02 12:49:47,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:49:47,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:48,048 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:49:48,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:48,069 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 128 proven. 187 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 12:49:48,069 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:49:48,069 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1973509688] [2021-05-02 12:49:48,070 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1973509688] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:48,070 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1821091967] [2021-05-02 12:49:48,070 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 12:49:48,135 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:49:48,135 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:49:48,136 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 25 conjunts are in the unsatisfiable core [2021-05-02 12:49:48,141 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:49:48,226 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:49:48,240 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 128 proven. 187 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 12:49:48,241 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1821091967] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:48,241 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:49:48,241 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2021-05-02 12:49:48,241 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [493563295] [2021-05-02 12:49:48,241 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 12:49:48,242 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:49:48,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 12:49:48,242 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-05-02 12:49:48,242 INFO L87 Difference]: Start difference. First operand 58 states and 63 transitions. Second operand has 16 states, 16 states have (on average 3.0625) internal successors, (49), 15 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 12:49:48,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:49:48,762 INFO L93 Difference]: Finished difference Result 79 states and 89 transitions. [2021-05-02 12:49:48,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 12:49:48,763 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.0625) internal successors, (49), 15 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 56 [2021-05-02 12:49:48,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:49:48,764 INFO L225 Difference]: With dead ends: 79 [2021-05-02 12:49:48,764 INFO L226 Difference]: Without dead ends: 62 [2021-05-02 12:49:48,764 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 58 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 378.1ms TimeCoverageRelationStatistics Valid=101, Invalid=655, Unknown=0, NotChecked=0, Total=756 [2021-05-02 12:49:48,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-05-02 12:49:48,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2021-05-02 12:49:48,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 56 states have (on average 1.1071428571428572) internal successors, (62), 56 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 12:49:48,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 66 transitions. [2021-05-02 12:49:48,769 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 66 transitions. Word has length 56 [2021-05-02 12:49:48,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:49:48,769 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 66 transitions. [2021-05-02 12:49:48,770 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 3.0625) internal successors, (49), 15 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 12:49:48,770 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 66 transitions. [2021-05-02 12:49:48,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 12:49:48,770 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:49:48,770 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 12, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:49:48,985 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:49:48,985 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:49:48,986 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:49:48,986 INFO L82 PathProgramCache]: Analyzing trace with hash -1514238397, now seen corresponding path program 11 times [2021-05-02 12:49:48,986 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:49:48,986 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1012136203] [2021-05-02 12:49:48,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:49:48,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:49,161 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:49:49,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:49,166 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 139 proven. 222 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 12:49:49,166 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:49:49,166 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1012136203] [2021-05-02 12:49:49,166 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1012136203] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:49,166 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [665820368] [2021-05-02 12:49:49,166 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 12:49:49,930 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 17 check-sat command(s) [2021-05-02 12:49:49,930 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:49:49,933 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 38 conjunts are in the unsatisfiable core [2021-05-02 12:49:49,934 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:49:50,115 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:49:50,131 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 139 proven. 222 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 12:49:50,131 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [665820368] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:50,131 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:49:50,131 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2021-05-02 12:49:50,132 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1979207457] [2021-05-02 12:49:50,132 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 12:49:50,132 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:49:50,132 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 12:49:50,132 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2021-05-02 12:49:50,133 INFO L87 Difference]: Start difference. First operand 61 states and 66 transitions. Second operand has 17 states, 17 states have (on average 3.0588235294117645) internal successors, (52), 16 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 12:49:50,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:49:50,686 INFO L93 Difference]: Finished difference Result 82 states and 92 transitions. [2021-05-02 12:49:50,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 12:49:50,687 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 3.0588235294117645) internal successors, (52), 16 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 59 [2021-05-02 12:49:50,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:49:50,687 INFO L225 Difference]: With dead ends: 82 [2021-05-02 12:49:50,687 INFO L226 Difference]: Without dead ends: 65 [2021-05-02 12:49:50,688 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 51 SyntacticMatches, 11 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 512.6ms TimeCoverageRelationStatistics Valid=109, Invalid=761, Unknown=0, NotChecked=0, Total=870 [2021-05-02 12:49:50,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-02 12:49:50,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 64. [2021-05-02 12:49:50,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 59 states have (on average 1.1016949152542372) internal successors, (65), 59 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 12:49:50,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 69 transitions. [2021-05-02 12:49:50,692 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 69 transitions. Word has length 59 [2021-05-02 12:49:50,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:49:50,692 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 69 transitions. [2021-05-02 12:49:50,692 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 3.0588235294117645) internal successors, (52), 16 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 12:49:50,692 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 69 transitions. [2021-05-02 12:49:50,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-05-02 12:49:50,692 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:49:50,692 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 13, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:49:50,908 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 12:49:50,908 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:49:50,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:49:50,909 INFO L82 PathProgramCache]: Analyzing trace with hash 261274765, now seen corresponding path program 12 times [2021-05-02 12:49:50,909 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:49:50,909 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1849092920] [2021-05-02 12:49:50,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:49:50,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:51,090 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:49:51,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:51,096 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 150 proven. 260 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 12:49:51,096 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:49:51,096 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1849092920] [2021-05-02 12:49:51,096 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1849092920] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:51,096 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [701342296] [2021-05-02 12:49:51,096 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 12:49:51,277 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-05-02 12:49:51,277 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:49:51,278 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-02 12:49:51,280 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:49:51,450 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 0 proven. 165 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2021-05-02 12:49:51,451 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [701342296] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:51,451 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:49:51,451 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 9] total 24 [2021-05-02 12:49:51,451 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [947497043] [2021-05-02 12:49:51,451 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 12:49:51,452 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:49:51,452 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 12:49:51,452 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=494, Unknown=0, NotChecked=0, Total=552 [2021-05-02 12:49:51,453 INFO L87 Difference]: Start difference. First operand 64 states and 69 transitions. Second operand has 24 states, 24 states have (on average 2.9166666666666665) internal successors, (70), 22 states have internal predecessors, (70), 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 12:49:52,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:49:52,440 INFO L93 Difference]: Finished difference Result 91 states and 103 transitions. [2021-05-02 12:49:52,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 12:49:52,440 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.9166666666666665) internal successors, (70), 22 states have internal predecessors, (70), 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 12:49:52,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:49:52,441 INFO L225 Difference]: With dead ends: 91 [2021-05-02 12:49:52,441 INFO L226 Difference]: Without dead ends: 71 [2021-05-02 12:49:52,442 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 217 ImplicationChecksByTransitivity, 817.3ms TimeCoverageRelationStatistics Valid=198, Invalid=1782, Unknown=0, NotChecked=0, Total=1980 [2021-05-02 12:49:52,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-05-02 12:49:52,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 70. [2021-05-02 12:49:52,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 65 states have (on average 1.1076923076923078) internal successors, (72), 65 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 12:49:52,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 76 transitions. [2021-05-02 12:49:52,446 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 76 transitions. Word has length 62 [2021-05-02 12:49:52,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:49:52,446 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 76 transitions. [2021-05-02 12:49:52,446 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 2.9166666666666665) internal successors, (70), 22 states have internal predecessors, (70), 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 12:49:52,446 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 76 transitions. [2021-05-02 12:49:52,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-05-02 12:49:52,446 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:49:52,447 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 14, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:49:52,653 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 12:49:52,653 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:49:52,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:49:52,654 INFO L82 PathProgramCache]: Analyzing trace with hash 1123777867, now seen corresponding path program 13 times [2021-05-02 12:49:52,654 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:49:52,654 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1858330064] [2021-05-02 12:49:52,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:49:52,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:52,872 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:49:52,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:52,877 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 205 proven. 301 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 12:49:52,877 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:49:52,877 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1858330064] [2021-05-02 12:49:52,877 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1858330064] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:52,877 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1992083616] [2021-05-02 12:49:52,877 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 12:49:52,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:52,915 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-02 12:49:52,916 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:49:53,013 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:49:53,031 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 205 proven. 301 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 12:49:53,031 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1992083616] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:53,031 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:49:53,031 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2021-05-02 12:49:53,031 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [808877767] [2021-05-02 12:49:53,032 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 12:49:53,032 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:49:53,032 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 12:49:53,032 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2021-05-02 12:49:53,032 INFO L87 Difference]: Start difference. First operand 70 states and 76 transitions. Second operand has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 18 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 12:49:53,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:49:53,744 INFO L93 Difference]: Finished difference Result 94 states and 106 transitions. [2021-05-02 12:49:53,745 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 12:49:53,745 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 18 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 68 [2021-05-02 12:49:53,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:49:53,745 INFO L225 Difference]: With dead ends: 94 [2021-05-02 12:49:53,745 INFO L226 Difference]: Without dead ends: 74 [2021-05-02 12:49:53,746 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 70 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 516.8ms TimeCoverageRelationStatistics Valid=125, Invalid=997, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 12:49:53,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-05-02 12:49:53,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2021-05-02 12:49:53,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 68 states have (on average 1.1029411764705883) internal successors, (75), 68 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 12:49:53,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 79 transitions. [2021-05-02 12:49:53,750 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 79 transitions. Word has length 68 [2021-05-02 12:49:53,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:49:53,750 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 79 transitions. [2021-05-02 12:49:53,750 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 18 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 12:49:53,750 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 79 transitions. [2021-05-02 12:49:53,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-05-02 12:49:53,751 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:49:53,751 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 15, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:49:53,965 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-02 12:49:53,965 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:49:53,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:49:53,965 INFO L82 PathProgramCache]: Analyzing trace with hash 2000011841, now seen corresponding path program 14 times [2021-05-02 12:49:53,965 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:49:53,965 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [438043162] [2021-05-02 12:49:53,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:49:53,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:54,219 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:49:54,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:54,223 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 219 proven. 345 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 12:49:54,223 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:49:54,223 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [438043162] [2021-05-02 12:49:54,223 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [438043162] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:54,224 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1681059182] [2021-05-02 12:49:54,224 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 12:49:54,273 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:49:54,274 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:49:54,275 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 33 conjunts are in the unsatisfiable core [2021-05-02 12:49:54,276 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:49:54,375 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:49:54,402 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 219 proven. 345 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 12:49:54,402 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1681059182] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:54,402 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:49:54,402 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2021-05-02 12:49:54,402 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2044732084] [2021-05-02 12:49:54,403 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 12:49:54,403 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:49:54,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 12:49:54,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2021-05-02 12:49:54,403 INFO L87 Difference]: Start difference. First operand 73 states and 79 transitions. Second operand has 20 states, 20 states have (on average 3.05) internal successors, (61), 19 states have internal predecessors, (61), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:55,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:49:55,200 INFO L93 Difference]: Finished difference Result 97 states and 109 transitions. [2021-05-02 12:49:55,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 12:49:55,201 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 3.05) internal successors, (61), 19 states have internal predecessors, (61), 2 states have call successors, (4), 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 12:49:55,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:49:55,201 INFO L225 Difference]: With dead ends: 97 [2021-05-02 12:49:55,201 INFO L226 Difference]: Without dead ends: 77 [2021-05-02 12:49:55,202 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 73 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 599.2ms TimeCoverageRelationStatistics Valid=133, Invalid=1127, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 12:49:55,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-02 12:49:55,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 76. [2021-05-02 12:49:55,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 71 states have (on average 1.0985915492957747) internal successors, (78), 71 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 12:49:55,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 82 transitions. [2021-05-02 12:49:55,206 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 82 transitions. Word has length 71 [2021-05-02 12:49:55,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:49:55,206 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 82 transitions. [2021-05-02 12:49:55,206 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 3.05) internal successors, (61), 19 states have internal predecessors, (61), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:55,206 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 82 transitions. [2021-05-02 12:49:55,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-05-02 12:49:55,207 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:49:55,207 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 16, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:49:55,421 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:49:55,421 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:49:55,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:49:55,421 INFO L82 PathProgramCache]: Analyzing trace with hash 1075106187, now seen corresponding path program 15 times [2021-05-02 12:49:55,422 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:49:55,422 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1746545020] [2021-05-02 12:49:55,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:49:55,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:55,640 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:49:55,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:55,647 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 233 proven. 392 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 12:49:55,647 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:49:55,647 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1746545020] [2021-05-02 12:49:55,647 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1746545020] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:55,647 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1127148924] [2021-05-02 12:49:55,647 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 12:49:55,735 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-05-02 12:49:55,735 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:49:55,736 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 12:49:55,738 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:49:55,976 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 0 proven. 259 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2021-05-02 12:49:55,977 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1127148924] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:55,977 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:49:55,977 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 10] total 28 [2021-05-02 12:49:55,977 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [254791055] [2021-05-02 12:49:55,977 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 12:49:55,977 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:49:55,978 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 12:49:55,978 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=687, Unknown=0, NotChecked=0, Total=756 [2021-05-02 12:49:55,978 INFO L87 Difference]: Start difference. First operand 76 states and 82 transitions. Second operand has 28 states, 28 states have (on average 2.9285714285714284) internal successors, (82), 26 states have internal predecessors, (82), 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 12:49:57,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:49:57,441 INFO L93 Difference]: Finished difference Result 106 states and 120 transitions. [2021-05-02 12:49:57,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-02 12:49:57,441 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.9285714285714284) internal successors, (82), 26 states have internal predecessors, (82), 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 74 [2021-05-02 12:49:57,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:49:57,442 INFO L225 Difference]: With dead ends: 106 [2021-05-02 12:49:57,442 INFO L226 Difference]: Without dead ends: 83 [2021-05-02 12:49:57,443 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 308 ImplicationChecksByTransitivity, 1067.9ms TimeCoverageRelationStatistics Valid=237, Invalid=2519, Unknown=0, NotChecked=0, Total=2756 [2021-05-02 12:49:57,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-05-02 12:49:57,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 82. [2021-05-02 12:49:57,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 77 states have (on average 1.103896103896104) internal successors, (85), 77 states have internal predecessors, (85), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:57,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 89 transitions. [2021-05-02 12:49:57,447 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 89 transitions. Word has length 74 [2021-05-02 12:49:57,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:49:57,447 INFO L480 AbstractCegarLoop]: Abstraction has 82 states and 89 transitions. [2021-05-02 12:49:57,447 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 2.9285714285714284) internal successors, (82), 26 states have internal predecessors, (82), 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 12:49:57,447 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 89 transitions. [2021-05-02 12:49:57,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-05-02 12:49:57,448 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:49:57,448 INFO L523 BasicCegarLoop]: trace histogram [23, 23, 17, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:49:57,648 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 12:49:57,648 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:49:57,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:49:57,649 INFO L82 PathProgramCache]: Analyzing trace with hash -27098995, now seen corresponding path program 16 times [2021-05-02 12:49:57,649 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:49:57,649 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1854610960] [2021-05-02 12:49:57,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:49:57,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:57,918 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:49:57,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:57,923 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 300 proven. 442 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 12:49:57,923 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:49:57,923 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1854610960] [2021-05-02 12:49:57,923 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1854610960] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:57,923 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2107496158] [2021-05-02 12:49:57,923 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 12:49:57,968 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:49:57,968 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:49:57,970 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 37 conjunts are in the unsatisfiable core [2021-05-02 12:49:57,971 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:49:58,092 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:49:58,111 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 300 proven. 442 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 12:49:58,112 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2107496158] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:58,112 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:49:58,112 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2021-05-02 12:49:58,112 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [270130578] [2021-05-02 12:49:58,114 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 12:49:58,115 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:49:58,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 12:49:58,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2021-05-02 12:49:58,116 INFO L87 Difference]: Start difference. First operand 82 states and 89 transitions. Second operand has 22 states, 22 states have (on average 3.0454545454545454) internal successors, (67), 21 states have internal predecessors, (67), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:58,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:49:58,944 INFO L93 Difference]: Finished difference Result 109 states and 123 transitions. [2021-05-02 12:49:58,944 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-02 12:49:58,944 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 3.0454545454545454) internal successors, (67), 21 states have internal predecessors, (67), 2 states have call successors, (4), 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 80 [2021-05-02 12:49:58,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:49:58,945 INFO L225 Difference]: With dead ends: 109 [2021-05-02 12:49:58,945 INFO L226 Difference]: Without dead ends: 86 [2021-05-02 12:49:58,946 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 82 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 655.7ms TimeCoverageRelationStatistics Valid=149, Invalid=1411, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 12:49:58,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-05-02 12:49:58,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2021-05-02 12:49:58,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 80 states have (on average 1.1) internal successors, (88), 80 states have internal predecessors, (88), 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 12:49:58,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 92 transitions. [2021-05-02 12:49:58,950 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 92 transitions. Word has length 80 [2021-05-02 12:49:58,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:49:58,950 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 92 transitions. [2021-05-02 12:49:58,950 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 3.0454545454545454) internal successors, (67), 21 states have internal predecessors, (67), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:58,950 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 92 transitions. [2021-05-02 12:49:58,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-02 12:49:58,951 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:49:58,951 INFO L523 BasicCegarLoop]: trace histogram [24, 24, 18, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:49:59,168 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:49:59,169 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:49:59,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:49:59,169 INFO L82 PathProgramCache]: Analyzing trace with hash -1421933437, now seen corresponding path program 17 times [2021-05-02 12:49:59,169 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:49:59,169 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1157644029] [2021-05-02 12:49:59,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:49:59,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:59,434 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:49:59,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:59,439 INFO L134 CoverageAnalysis]: Checked inductivity of 852 backedges. 317 proven. 495 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 12:49:59,439 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:49:59,439 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1157644029] [2021-05-02 12:49:59,439 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1157644029] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:59,439 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [949047939] [2021-05-02 12:49:59,439 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 12:50:05,703 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 25 check-sat command(s) [2021-05-02 12:50:05,703 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:50:05,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 56 conjunts are in the unsatisfiable core [2021-05-02 12:50:05,709 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:50:05,997 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:06,037 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:06,056 INFO L134 CoverageAnalysis]: Checked inductivity of 852 backedges. 317 proven. 495 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 12:50:06,057 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [949047939] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:06,057 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:50:06,057 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2021-05-02 12:50:06,057 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2068522093] [2021-05-02 12:50:06,057 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 12:50:06,057 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:50:06,058 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 12:50:06,058 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2021-05-02 12:50:06,058 INFO L87 Difference]: Start difference. First operand 85 states and 92 transitions. Second operand has 23 states, 23 states have (on average 3.0434782608695654) internal successors, (70), 22 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 12:50:07,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:50:07,028 INFO L93 Difference]: Finished difference Result 112 states and 126 transitions. [2021-05-02 12:50:07,029 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 12:50:07,029 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 3.0434782608695654) internal successors, (70), 22 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 83 [2021-05-02 12:50:07,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:50:07,029 INFO L225 Difference]: With dead ends: 112 [2021-05-02 12:50:07,030 INFO L226 Difference]: Without dead ends: 89 [2021-05-02 12:50:07,030 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 68 SyntacticMatches, 18 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 208 ImplicationChecksByTransitivity, 910.7ms TimeCoverageRelationStatistics Valid=157, Invalid=1565, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 12:50:07,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-05-02 12:50:07,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 88. [2021-05-02 12:50:07,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 83 states have (on average 1.0963855421686748) internal successors, (91), 83 states have internal predecessors, (91), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:07,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 95 transitions. [2021-05-02 12:50:07,034 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 95 transitions. Word has length 83 [2021-05-02 12:50:07,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:50:07,034 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 95 transitions. [2021-05-02 12:50:07,034 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 3.0434782608695654) internal successors, (70), 22 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 12:50:07,034 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 95 transitions. [2021-05-02 12:50:07,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-05-02 12:50:07,034 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:50:07,035 INFO L523 BasicCegarLoop]: trace histogram [25, 25, 19, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:50:07,240 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:50:07,240 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:50:07,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:50:07,241 INFO L82 PathProgramCache]: Analyzing trace with hash -1126206259, now seen corresponding path program 18 times [2021-05-02 12:50:07,241 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:50:07,241 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [245582784] [2021-05-02 12:50:07,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:50:07,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:07,547 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:50:07,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:07,551 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 334 proven. 551 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 12:50:07,551 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:50:07,551 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [245582784] [2021-05-02 12:50:07,551 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [245582784] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:07,551 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1212801175] [2021-05-02 12:50:07,551 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 12:50:07,999 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2021-05-02 12:50:07,999 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:50:08,002 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 12:50:08,003 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:50:08,271 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 0 proven. 374 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2021-05-02 12:50:08,272 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1212801175] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:08,272 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:50:08,272 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 11] total 32 [2021-05-02 12:50:08,272 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [524153903] [2021-05-02 12:50:08,274 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-02 12:50:08,274 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:50:08,276 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-02 12:50:08,276 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=912, Unknown=0, NotChecked=0, Total=992 [2021-05-02 12:50:08,276 INFO L87 Difference]: Start difference. First operand 88 states and 95 transitions. Second operand has 32 states, 32 states have (on average 2.9375) internal successors, (94), 30 states have internal predecessors, (94), 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 12:50:09,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:50:09,985 INFO L93 Difference]: Finished difference Result 121 states and 137 transitions. [2021-05-02 12:50:09,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-02 12:50:09,986 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.9375) internal successors, (94), 30 states have internal predecessors, (94), 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 86 [2021-05-02 12:50:09,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:50:09,986 INFO L225 Difference]: With dead ends: 121 [2021-05-02 12:50:09,986 INFO L226 Difference]: Without dead ends: 95 [2021-05-02 12:50:09,987 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 415 ImplicationChecksByTransitivity, 1274.5ms TimeCoverageRelationStatistics Valid=276, Invalid=3384, Unknown=0, NotChecked=0, Total=3660 [2021-05-02 12:50:09,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-05-02 12:50:09,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 94. [2021-05-02 12:50:09,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 89 states have (on average 1.101123595505618) internal successors, (98), 89 states have internal predecessors, (98), 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 12:50:09,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 102 transitions. [2021-05-02 12:50:09,991 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 102 transitions. Word has length 86 [2021-05-02 12:50:09,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:50:09,991 INFO L480 AbstractCegarLoop]: Abstraction has 94 states and 102 transitions. [2021-05-02 12:50:09,991 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 2.9375) internal successors, (94), 30 states have internal predecessors, (94), 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 12:50:09,992 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 102 transitions. [2021-05-02 12:50:09,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-05-02 12:50:09,992 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:50:09,992 INFO L523 BasicCegarLoop]: trace histogram [27, 27, 20, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:50:10,196 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-05-02 12:50:10,196 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:50:10,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:50:10,196 INFO L82 PathProgramCache]: Analyzing trace with hash 1342414603, now seen corresponding path program 19 times [2021-05-02 12:50:10,196 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:50:10,196 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [320873285] [2021-05-02 12:50:10,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:50:10,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:10,500 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:50:10,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:10,504 INFO L134 CoverageAnalysis]: Checked inductivity of 1080 backedges. 413 proven. 610 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 12:50:10,504 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:50:10,504 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [320873285] [2021-05-02 12:50:10,504 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [320873285] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:10,504 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [108000894] [2021-05-02 12:50:10,504 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 12:50:10,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:10,547 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 43 conjunts are in the unsatisfiable core [2021-05-02 12:50:10,548 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:50:10,661 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:10,679 INFO L134 CoverageAnalysis]: Checked inductivity of 1080 backedges. 413 proven. 610 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 12:50:10,680 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [108000894] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:10,680 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:50:10,680 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2021-05-02 12:50:10,680 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1648588605] [2021-05-02 12:50:10,680 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 12:50:10,680 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:50:10,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 12:50:10,681 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2021-05-02 12:50:10,681 INFO L87 Difference]: Start difference. First operand 94 states and 102 transitions. Second operand has 25 states, 25 states have (on average 3.04) internal successors, (76), 24 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 12:50:11,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:50:11,747 INFO L93 Difference]: Finished difference Result 124 states and 140 transitions. [2021-05-02 12:50:11,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 12:50:11,747 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 3.04) internal successors, (76), 24 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 92 [2021-05-02 12:50:11,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:50:11,748 INFO L225 Difference]: With dead ends: 124 [2021-05-02 12:50:11,748 INFO L226 Difference]: Without dead ends: 98 [2021-05-02 12:50:11,749 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 94 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 214 ImplicationChecksByTransitivity, 789.8ms TimeCoverageRelationStatistics Valid=173, Invalid=1897, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 12:50:11,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-05-02 12:50:11,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2021-05-02 12:50:11,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 92 states have (on average 1.0978260869565217) internal successors, (101), 92 states have internal predecessors, (101), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:11,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 105 transitions. [2021-05-02 12:50:11,753 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 105 transitions. Word has length 92 [2021-05-02 12:50:11,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:50:11,753 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 105 transitions. [2021-05-02 12:50:11,753 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 3.04) internal successors, (76), 24 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 12:50:11,753 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 105 transitions. [2021-05-02 12:50:11,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-05-02 12:50:11,754 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:50:11,754 INFO L523 BasicCegarLoop]: trace histogram [28, 28, 21, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:50:11,970 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:50:11,971 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:50:11,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:50:11,971 INFO L82 PathProgramCache]: Analyzing trace with hash -786701823, now seen corresponding path program 20 times [2021-05-02 12:50:11,971 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:50:11,971 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [997257893] [2021-05-02 12:50:11,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:50:11,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:12,318 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:50:12,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:12,322 INFO L134 CoverageAnalysis]: Checked inductivity of 1162 backedges. 433 proven. 672 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 12:50:12,322 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:50:12,322 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [997257893] [2021-05-02 12:50:12,322 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [997257893] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:12,322 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1082276983] [2021-05-02 12:50:12,322 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 12:50:12,375 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:50:12,375 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:50:12,376 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 45 conjunts are in the unsatisfiable core [2021-05-02 12:50:12,378 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:50:12,507 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:12,527 INFO L134 CoverageAnalysis]: Checked inductivity of 1162 backedges. 433 proven. 672 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 12:50:12,527 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1082276983] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:12,527 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:50:12,527 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 26 [2021-05-02 12:50:12,528 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [12077671] [2021-05-02 12:50:12,529 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 12:50:12,529 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:50:12,529 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 12:50:12,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2021-05-02 12:50:12,529 INFO L87 Difference]: Start difference. First operand 97 states and 105 transitions. Second operand has 26 states, 26 states have (on average 3.0384615384615383) internal successors, (79), 25 states have internal predecessors, (79), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:13,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:50:13,658 INFO L93 Difference]: Finished difference Result 127 states and 143 transitions. [2021-05-02 12:50:13,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-02 12:50:13,659 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 3.0384615384615383) internal successors, (79), 25 states have internal predecessors, (79), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 95 [2021-05-02 12:50:13,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:50:13,659 INFO L225 Difference]: With dead ends: 127 [2021-05-02 12:50:13,660 INFO L226 Difference]: Without dead ends: 101 [2021-05-02 12:50:13,660 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 97 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 235 ImplicationChecksByTransitivity, 888.2ms TimeCoverageRelationStatistics Valid=181, Invalid=2075, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 12:50:13,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-05-02 12:50:13,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 100. [2021-05-02 12:50:13,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 95 states have (on average 1.0947368421052632) internal successors, (104), 95 states have internal predecessors, (104), 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 12:50:13,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 108 transitions. [2021-05-02 12:50:13,664 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 108 transitions. Word has length 95 [2021-05-02 12:50:13,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:50:13,664 INFO L480 AbstractCegarLoop]: Abstraction has 100 states and 108 transitions. [2021-05-02 12:50:13,665 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 3.0384615384615383) internal successors, (79), 25 states have internal predecessors, (79), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:13,665 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 108 transitions. [2021-05-02 12:50:13,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-05-02 12:50:13,665 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:50:13,665 INFO L523 BasicCegarLoop]: trace histogram [29, 29, 22, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:50:13,872 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-02 12:50:13,873 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:50:13,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:50:13,873 INFO L82 PathProgramCache]: Analyzing trace with hash -1217121461, now seen corresponding path program 21 times [2021-05-02 12:50:13,873 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:50:13,874 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1771766428] [2021-05-02 12:50:13,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:50:13,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:14,247 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:50:14,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:14,252 INFO L134 CoverageAnalysis]: Checked inductivity of 1247 backedges. 453 proven. 737 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 12:50:14,252 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:50:14,252 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1771766428] [2021-05-02 12:50:14,252 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1771766428] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:14,252 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1482875696] [2021-05-02 12:50:14,252 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 12:50:14,351 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-05-02 12:50:14,352 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:50:14,353 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 12:50:14,355 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:50:14,687 INFO L134 CoverageAnalysis]: Checked inductivity of 1247 backedges. 0 proven. 510 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2021-05-02 12:50:14,688 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1482875696] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:14,688 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:50:14,688 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 12] total 36 [2021-05-02 12:50:14,688 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [492655169] [2021-05-02 12:50:14,688 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-02 12:50:14,688 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:50:14,688 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-02 12:50:14,689 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=1169, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 12:50:14,689 INFO L87 Difference]: Start difference. First operand 100 states and 108 transitions. Second operand has 36 states, 36 states have (on average 2.9444444444444446) internal successors, (106), 34 states have internal predecessors, (106), 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 12:50:16,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:50:16,903 INFO L93 Difference]: Finished difference Result 136 states and 154 transitions. [2021-05-02 12:50:16,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-02 12:50:16,903 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.9444444444444446) internal successors, (106), 34 states have internal predecessors, (106), 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 98 [2021-05-02 12:50:16,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:50:16,905 INFO L225 Difference]: With dead ends: 136 [2021-05-02 12:50:16,906 INFO L226 Difference]: Without dead ends: 107 [2021-05-02 12:50:16,908 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 538 ImplicationChecksByTransitivity, 1606.3ms TimeCoverageRelationStatistics Valid=315, Invalid=4377, Unknown=0, NotChecked=0, Total=4692 [2021-05-02 12:50:16,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-05-02 12:50:16,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 106. [2021-05-02 12:50:16,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 101 states have (on average 1.099009900990099) internal successors, (111), 101 states have internal predecessors, (111), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:16,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 115 transitions. [2021-05-02 12:50:16,912 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 115 transitions. Word has length 98 [2021-05-02 12:50:16,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:50:16,912 INFO L480 AbstractCegarLoop]: Abstraction has 106 states and 115 transitions. [2021-05-02 12:50:16,912 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 2.9444444444444446) internal successors, (106), 34 states have internal predecessors, (106), 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 12:50:16,912 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 115 transitions. [2021-05-02 12:50:16,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-05-02 12:50:16,913 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:50:16,913 INFO L523 BasicCegarLoop]: trace histogram [31, 31, 23, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:50:17,113 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-05-02 12:50:17,114 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:50:17,114 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:50:17,114 INFO L82 PathProgramCache]: Analyzing trace with hash 1024624845, now seen corresponding path program 22 times [2021-05-02 12:50:17,114 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:50:17,114 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [563750402] [2021-05-02 12:50:17,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:50:17,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:17,499 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:50:17,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:17,503 INFO L134 CoverageAnalysis]: Checked inductivity of 1426 backedges. 544 proven. 805 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 12:50:17,503 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:50:17,503 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [563750402] [2021-05-02 12:50:17,504 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [563750402] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:17,504 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [414508679] [2021-05-02 12:50:17,504 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 12:50:17,565 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:50:17,565 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:50:17,567 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 49 conjunts are in the unsatisfiable core [2021-05-02 12:50:17,568 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:50:17,713 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:17,741 INFO L134 CoverageAnalysis]: Checked inductivity of 1426 backedges. 544 proven. 805 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 12:50:17,742 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [414508679] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:17,742 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:50:17,742 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 28 [2021-05-02 12:50:17,742 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1024938778] [2021-05-02 12:50:17,742 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 12:50:17,742 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:50:17,743 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 12:50:17,743 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2021-05-02 12:50:17,743 INFO L87 Difference]: Start difference. First operand 106 states and 115 transitions. Second operand has 28 states, 28 states have (on average 3.0357142857142856) internal successors, (85), 27 states have internal predecessors, (85), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:19,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:50:19,097 INFO L93 Difference]: Finished difference Result 139 states and 157 transitions. [2021-05-02 12:50:19,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 12:50:19,097 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 3.0357142857142856) internal successors, (85), 27 states have internal predecessors, (85), 2 states have call successors, (4), 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 104 [2021-05-02 12:50:19,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:50:19,098 INFO L225 Difference]: With dead ends: 139 [2021-05-02 12:50:19,098 INFO L226 Difference]: Without dead ends: 110 [2021-05-02 12:50:19,098 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 106 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 280 ImplicationChecksByTransitivity, 981.5ms TimeCoverageRelationStatistics Valid=197, Invalid=2455, Unknown=0, NotChecked=0, Total=2652 [2021-05-02 12:50:19,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-05-02 12:50:19,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 109. [2021-05-02 12:50:19,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 104 states have (on average 1.0961538461538463) internal successors, (114), 104 states have internal predecessors, (114), 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 12:50:19,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 118 transitions. [2021-05-02 12:50:19,103 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 118 transitions. Word has length 104 [2021-05-02 12:50:19,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:50:19,103 INFO L480 AbstractCegarLoop]: Abstraction has 109 states and 118 transitions. [2021-05-02 12:50:19,103 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 3.0357142857142856) internal successors, (85), 27 states have internal predecessors, (85), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:19,103 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 118 transitions. [2021-05-02 12:50:19,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-05-02 12:50:19,103 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:50:19,104 INFO L523 BasicCegarLoop]: trace histogram [32, 32, 24, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:50:19,312 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:50:19,313 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:50:19,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:50:19,313 INFO L82 PathProgramCache]: Analyzing trace with hash -742389053, now seen corresponding path program 23 times [2021-05-02 12:50:19,313 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:50:19,313 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [915803552] [2021-05-02 12:50:19,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:50:19,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:19,719 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:50:19,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:19,726 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 567 proven. 876 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 12:50:19,727 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:50:19,727 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [915803552] [2021-05-02 12:50:19,727 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [915803552] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:19,727 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1491913163] [2021-05-02 12:50:19,727 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 12:50:52,964 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 33 check-sat command(s) [2021-05-02 12:50:52,964 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:50:52,971 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 61 conjunts are in the unsatisfiable core [2021-05-02 12:50:52,973 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:50:53,242 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:53,255 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 237 proven. 1276 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 12:50:53,255 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1491913163] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:53,255 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:50:53,255 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 32] total 34 [2021-05-02 12:50:53,255 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [917884730] [2021-05-02 12:50:53,256 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-02 12:50:53,256 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:50:53,256 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-02 12:50:53,256 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=1032, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 12:50:53,256 INFO L87 Difference]: Start difference. First operand 109 states and 118 transitions. Second operand has 34 states, 34 states have (on average 3.0294117647058822) internal successors, (103), 33 states have internal predecessors, (103), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:55,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:50:55,150 INFO L93 Difference]: Finished difference Result 157 states and 180 transitions. [2021-05-02 12:50:55,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-02 12:50:55,151 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 3.0294117647058822) internal successors, (103), 33 states have internal predecessors, (103), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 107 [2021-05-02 12:50:55,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:50:55,152 INFO L225 Difference]: With dead ends: 157 [2021-05-02 12:50:55,152 INFO L226 Difference]: Without dead ends: 128 [2021-05-02 12:50:55,153 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 104 SyntacticMatches, 1 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 454 ImplicationChecksByTransitivity, 1339.3ms TimeCoverageRelationStatistics Valid=235, Invalid=3797, Unknown=0, NotChecked=0, Total=4032 [2021-05-02 12:50:55,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-05-02 12:50:55,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 127. [2021-05-02 12:50:55,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 122 states have (on average 1.0819672131147542) internal successors, (132), 122 states have internal predecessors, (132), 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 12:50:55,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 136 transitions. [2021-05-02 12:50:55,156 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 136 transitions. Word has length 107 [2021-05-02 12:50:55,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:50:55,157 INFO L480 AbstractCegarLoop]: Abstraction has 127 states and 136 transitions. [2021-05-02 12:50:55,157 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 3.0294117647058822) internal successors, (103), 33 states have internal predecessors, (103), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:55,157 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 136 transitions. [2021-05-02 12:50:55,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-05-02 12:50:55,157 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:50:55,157 INFO L523 BasicCegarLoop]: trace histogram [38, 38, 30, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:50:55,363 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-05-02 12:50:55,363 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:50:55,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:50:55,363 INFO L82 PathProgramCache]: Analyzing trace with hash 1711523331, now seen corresponding path program 24 times [2021-05-02 12:50:55,364 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:50:55,364 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2001962995] [2021-05-02 12:50:55,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:50:55,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:55,894 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:50:55,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:55,906 INFO L134 CoverageAnalysis]: Checked inductivity of 2147 backedges. 705 proven. 1365 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 12:50:55,906 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:50:55,906 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2001962995] [2021-05-02 12:50:55,906 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2001962995] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:55,906 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [254771154] [2021-05-02 12:50:55,906 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 12:50:57,128 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2021-05-02 12:50:57,128 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:50:57,130 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 24 conjunts are in the unsatisfiable core [2021-05-02 12:50:57,131 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:50:57,618 INFO L134 CoverageAnalysis]: Checked inductivity of 2147 backedges. 0 proven. 782 refuted. 0 times theorem prover too weak. 1365 trivial. 0 not checked. [2021-05-02 12:50:57,619 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [254771154] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:57,619 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:50:57,619 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 13] total 45 [2021-05-02 12:50:57,619 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1454138982] [2021-05-02 12:50:57,620 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-02 12:50:57,620 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:50:57,620 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-02 12:50:57,620 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1863, Unknown=0, NotChecked=0, Total=1980 [2021-05-02 12:50:57,620 INFO L87 Difference]: Start difference. First operand 127 states and 136 transitions. Second operand has 45 states, 45 states have (on average 2.9555555555555557) internal successors, (133), 43 states have internal predecessors, (133), 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 12:51:00,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:51:00,663 INFO L93 Difference]: Finished difference Result 166 states and 186 transitions. [2021-05-02 12:51:00,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-02 12:51:00,664 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 2.9555555555555557) internal successors, (133), 43 states have internal predecessors, (133), 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 125 [2021-05-02 12:51:00,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:51:00,665 INFO L225 Difference]: With dead ends: 166 [2021-05-02 12:51:00,665 INFO L226 Difference]: Without dead ends: 134 [2021-05-02 12:51:00,667 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 872 ImplicationChecksByTransitivity, 2290.5ms TimeCoverageRelationStatistics Valid=409, Invalid=7073, Unknown=0, NotChecked=0, Total=7482 [2021-05-02 12:51:00,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2021-05-02 12:51:00,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 133. [2021-05-02 12:51:00,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 128 states have (on average 1.0859375) internal successors, (139), 128 states have internal predecessors, (139), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:51:00,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 143 transitions. [2021-05-02 12:51:00,673 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 143 transitions. Word has length 125 [2021-05-02 12:51:00,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:51:00,673 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 143 transitions. [2021-05-02 12:51:00,673 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 45 states, 45 states have (on average 2.9555555555555557) internal successors, (133), 43 states have internal predecessors, (133), 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 12:51:00,674 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 143 transitions. [2021-05-02 12:51:00,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-05-02 12:51:00,674 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:51:00,674 INFO L523 BasicCegarLoop]: trace histogram [40, 40, 31, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:51:00,892 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:51:00,893 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:51:00,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:51:00,893 INFO L82 PathProgramCache]: Analyzing trace with hash 672475457, now seen corresponding path program 25 times [2021-05-02 12:51:00,893 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:51:00,893 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1537284904] [2021-05-02 12:51:00,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:51:00,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:51:01,470 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:51:01,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:51:01,474 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 823 proven. 1457 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 12:51:01,474 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:51:01,474 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1537284904] [2021-05-02 12:51:01,474 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1537284904] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:51:01,474 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [598995865] [2021-05-02 12:51:01,474 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 12:51:01,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:51:01,524 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 65 conjunts are in the unsatisfiable core [2021-05-02 12:51:01,525 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:51:01,703 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:51:01,732 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 823 proven. 1457 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 12:51:01,733 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [598995865] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:51:01,733 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:51:01,733 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34] total 36 [2021-05-02 12:51:01,733 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1983760506] [2021-05-02 12:51:01,733 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-02 12:51:01,733 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:51:01,734 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-02 12:51:01,734 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1159, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 12:51:01,734 INFO L87 Difference]: Start difference. First operand 133 states and 143 transitions. Second operand has 36 states, 36 states have (on average 3.0277777777777777) internal successors, (109), 35 states have internal predecessors, (109), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:51:03,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:51:03,805 INFO L93 Difference]: Finished difference Result 169 states and 189 transitions. [2021-05-02 12:51:03,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 12:51:03,805 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 3.0277777777777777) internal successors, (109), 35 states have internal predecessors, (109), 2 states have call successors, (4), 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 131 [2021-05-02 12:51:03,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:51:03,806 INFO L225 Difference]: With dead ends: 169 [2021-05-02 12:51:03,806 INFO L226 Difference]: Without dead ends: 137 [2021-05-02 12:51:03,807 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 133 SyntacticMatches, 1 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 500 ImplicationChecksByTransitivity, 1478.7ms TimeCoverageRelationStatistics Valid=261, Invalid=4295, Unknown=0, NotChecked=0, Total=4556 [2021-05-02 12:51:03,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2021-05-02 12:51:03,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 136. [2021-05-02 12:51:03,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 131 states have (on average 1.083969465648855) internal successors, (142), 131 states have internal predecessors, (142), 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 12:51:03,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 146 transitions. [2021-05-02 12:51:03,811 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 146 transitions. Word has length 131 [2021-05-02 12:51:03,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:51:03,811 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 146 transitions. [2021-05-02 12:51:03,811 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 3.0277777777777777) internal successors, (109), 35 states have internal predecessors, (109), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:51:03,811 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 146 transitions. [2021-05-02 12:51:03,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-05-02 12:51:03,812 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:51:03,812 INFO L523 BasicCegarLoop]: trace histogram [41, 41, 32, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:51:04,020 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-05-02 12:51:04,021 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:51:04,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:51:04,021 INFO L82 PathProgramCache]: Analyzing trace with hash -1965286005, now seen corresponding path program 26 times [2021-05-02 12:51:04,021 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:51:04,021 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1707364470] [2021-05-02 12:51:04,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:51:04,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:51:04,602 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:51:04,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:51:04,614 INFO L134 CoverageAnalysis]: Checked inductivity of 2501 backedges. 849 proven. 1552 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 12:51:04,614 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:51:04,614 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1707364470] [2021-05-02 12:51:04,614 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1707364470] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:51:04,614 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1390628244] [2021-05-02 12:51:04,614 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 12:51:04,667 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:51:04,667 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:51:04,668 INFO L263 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 67 conjunts are in the unsatisfiable core [2021-05-02 12:51:04,670 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:51:04,831 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:51:04,856 INFO L134 CoverageAnalysis]: Checked inductivity of 2501 backedges. 849 proven. 1552 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 12:51:04,856 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1390628244] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:51:04,856 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:51:04,856 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35] total 37 [2021-05-02 12:51:04,856 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [178460288] [2021-05-02 12:51:04,856 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-02 12:51:04,856 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:51:04,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-02 12:51:04,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1228, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 12:51:04,857 INFO L87 Difference]: Start difference. First operand 136 states and 146 transitions. Second operand has 37 states, 37 states have (on average 3.027027027027027) internal successors, (112), 36 states have internal predecessors, (112), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:51:07,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:51:07,152 INFO L93 Difference]: Finished difference Result 172 states and 192 transitions. [2021-05-02 12:51:07,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-02 12:51:07,152 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 3.027027027027027) internal successors, (112), 36 states have internal predecessors, (112), 2 states have call successors, (4), 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 134 [2021-05-02 12:51:07,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:51:07,153 INFO L225 Difference]: With dead ends: 172 [2021-05-02 12:51:07,153 INFO L226 Difference]: Without dead ends: 140 [2021-05-02 12:51:07,153 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 136 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 532 ImplicationChecksByTransitivity, 1552.3ms TimeCoverageRelationStatistics Valid=269, Invalid=4561, Unknown=0, NotChecked=0, Total=4830 [2021-05-02 12:51:07,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-05-02 12:51:07,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 139. [2021-05-02 12:51:07,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 134 states have (on average 1.0820895522388059) internal successors, (145), 134 states have internal predecessors, (145), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:51:07,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 149 transitions. [2021-05-02 12:51:07,158 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 149 transitions. Word has length 134 [2021-05-02 12:51:07,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:51:07,158 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 149 transitions. [2021-05-02 12:51:07,158 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 3.027027027027027) internal successors, (112), 36 states have internal predecessors, (112), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:51:07,158 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 149 transitions. [2021-05-02 12:51:07,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-05-02 12:51:07,158 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:51:07,159 INFO L523 BasicCegarLoop]: trace histogram [42, 42, 33, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:51:07,364 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-02 12:51:07,364 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:51:07,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:51:07,365 INFO L82 PathProgramCache]: Analyzing trace with hash 1499614465, now seen corresponding path program 27 times [2021-05-02 12:51:07,365 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:51:07,365 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [901198355] [2021-05-02 12:51:07,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:51:07,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:51:07,996 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:51:07,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:51:08,001 INFO L134 CoverageAnalysis]: Checked inductivity of 2625 backedges. 875 proven. 1650 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 12:51:08,001 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:51:08,001 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [901198355] [2021-05-02 12:51:08,001 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [901198355] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:51:08,001 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [290581963] [2021-05-02 12:51:08,001 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 12:51:08,130 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-05-02 12:51:08,130 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:51:08,131 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 26 conjunts are in the unsatisfiable core [2021-05-02 12:51:08,133 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:51:08,657 INFO L134 CoverageAnalysis]: Checked inductivity of 2625 backedges. 0 proven. 975 refuted. 0 times theorem prover too weak. 1650 trivial. 0 not checked. [2021-05-02 12:51:08,657 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [290581963] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:51:08,657 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:51:08,657 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 14] total 49 [2021-05-02 12:51:08,657 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2132571445] [2021-05-02 12:51:08,658 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-02 12:51:08,658 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:51:08,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-02 12:51:08,658 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=2224, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 12:51:08,658 INFO L87 Difference]: Start difference. First operand 139 states and 149 transitions. Second operand has 49 states, 49 states have (on average 2.9591836734693877) internal successors, (145), 47 states have internal predecessors, (145), 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 12:51:12,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:51:12,586 INFO L93 Difference]: Finished difference Result 181 states and 203 transitions. [2021-05-02 12:51:12,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-02 12:51:12,587 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.9591836734693877) internal successors, (145), 47 states have internal predecessors, (145), 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 137 [2021-05-02 12:51:12,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:51:12,588 INFO L225 Difference]: With dead ends: 181 [2021-05-02 12:51:12,588 INFO L226 Difference]: Without dead ends: 146 [2021-05-02 12:51:12,588 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1047 ImplicationChecksByTransitivity, 2684.0ms TimeCoverageRelationStatistics Valid=448, Invalid=8482, Unknown=0, NotChecked=0, Total=8930 [2021-05-02 12:51:12,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2021-05-02 12:51:12,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 145. [2021-05-02 12:51:12,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 145 states, 140 states have (on average 1.0857142857142856) internal successors, (152), 140 states have internal predecessors, (152), 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 12:51:12,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 156 transitions. [2021-05-02 12:51:12,594 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 156 transitions. Word has length 137 [2021-05-02 12:51:12,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:51:12,594 INFO L480 AbstractCegarLoop]: Abstraction has 145 states and 156 transitions. [2021-05-02 12:51:12,594 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 49 states have (on average 2.9591836734693877) internal successors, (145), 47 states have internal predecessors, (145), 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 12:51:12,594 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 156 transitions. [2021-05-02 12:51:12,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-05-02 12:51:12,595 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:51:12,595 INFO L523 BasicCegarLoop]: trace histogram [44, 44, 34, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:51:12,798 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,28 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:51:12,798 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:51:12,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:51:12,798 INFO L82 PathProgramCache]: Analyzing trace with hash 1232476291, now seen corresponding path program 28 times [2021-05-02 12:51:12,798 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:51:12,798 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [191205878] [2021-05-02 12:51:12,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:51:12,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:51:13,539 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:51:13,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:51:13,544 INFO L134 CoverageAnalysis]: Checked inductivity of 2882 backedges. 1005 proven. 1751 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-02 12:51:13,544 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:51:13,544 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [191205878] [2021-05-02 12:51:13,544 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [191205878] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:51:13,544 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1771288627] [2021-05-02 12:51:13,544 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 12:51:13,604 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:51:13,605 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:51:13,606 INFO L263 TraceCheckSpWp]: Trace formula consists of 285 conjuncts, 85 conjunts are in the unsatisfiable core [2021-05-02 12:51:13,610 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:51:14,044 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:51:14,062 INFO L134 CoverageAnalysis]: Checked inductivity of 2882 backedges. 333 proven. 2542 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 12:51:14,062 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1771288627] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:51:14,062 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:51:14,062 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 44] total 46 [2021-05-02 12:51:14,062 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1294347743] [2021-05-02 12:51:14,063 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-02 12:51:14,063 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:51:14,063 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-02 12:51:14,063 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=1946, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 12:51:14,063 INFO L87 Difference]: Start difference. First operand 145 states and 156 transitions. Second operand has 46 states, 46 states have (on average 3.0217391304347827) internal successors, (139), 45 states have internal predecessors, (139), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:51:17,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:51:17,668 INFO L93 Difference]: Finished difference Result 205 states and 234 transitions. [2021-05-02 12:51:17,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-02 12:51:17,669 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 3.0217391304347827) internal successors, (139), 45 states have internal predecessors, (139), 2 states have call successors, (4), 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 143 [2021-05-02 12:51:17,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:51:17,669 INFO L225 Difference]: With dead ends: 205 [2021-05-02 12:51:17,670 INFO L226 Difference]: Without dead ends: 170 [2021-05-02 12:51:17,670 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 138 SyntacticMatches, 1 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 886 ImplicationChecksByTransitivity, 2472.0ms TimeCoverageRelationStatistics Valid=327, Invalid=7329, Unknown=0, NotChecked=0, Total=7656 [2021-05-02 12:51:17,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2021-05-02 12:51:17,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 169. [2021-05-02 12:51:17,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 169 states, 164 states have (on average 1.0731707317073171) internal successors, (176), 164 states have internal predecessors, (176), 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 12:51:17,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 180 transitions. [2021-05-02 12:51:17,676 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 180 transitions. Word has length 143 [2021-05-02 12:51:17,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:51:17,676 INFO L480 AbstractCegarLoop]: Abstraction has 169 states and 180 transitions. [2021-05-02 12:51:17,676 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 46 states have (on average 3.0217391304347827) internal successors, (139), 45 states have internal predecessors, (139), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:51:17,676 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 180 transitions. [2021-05-02 12:51:17,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2021-05-02 12:51:17,677 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:51:17,677 INFO L523 BasicCegarLoop]: trace histogram [52, 52, 42, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:51:17,884 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:51:17,885 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:51:17,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:51:17,885 INFO L82 PathProgramCache]: Analyzing trace with hash -432978045, now seen corresponding path program 29 times [2021-05-02 12:51:17,885 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:51:17,885 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [730649316] [2021-05-02 12:51:17,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:51:17,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:51:18,869 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:51:18,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:51:18,873 INFO L134 CoverageAnalysis]: Checked inductivity of 4030 backedges. 1237 proven. 2667 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-02 12:51:18,873 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:51:18,873 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [730649316] [2021-05-02 12:51:18,873 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [730649316] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:51:18,873 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1042059269] [2021-05-02 12:51:18,874 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 12:57:08,812 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 53 check-sat command(s) [2021-05-02 12:57:08,812 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:57:08,850 INFO L263 TraceCheckSpWp]: Trace formula consists of 317 conjuncts, 136 conjunts are in the unsatisfiable core [2021-05-02 12:57:08,852 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:57:10,014 INFO L134 CoverageAnalysis]: Checked inductivity of 4030 backedges. 1237 proven. 2667 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-02 12:57:10,014 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1042059269] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:57:10,014 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:57:10,014 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 45] total 47 [2021-05-02 12:57:10,014 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [720330454] [2021-05-02 12:57:10,015 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-02 12:57:10,015 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:57:10,015 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-02 12:57:10,015 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=2028, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 12:57:10,016 INFO L87 Difference]: Start difference. First operand 169 states and 180 transitions. Second operand has 47 states, 47 states have (on average 3.021276595744681) internal successors, (142), 46 states have internal predecessors, (142), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:13,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:57:13,756 INFO L93 Difference]: Finished difference Result 208 states and 230 transitions. [2021-05-02 12:57:13,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-02 12:57:13,757 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 3.021276595744681) internal successors, (142), 46 states have internal predecessors, (142), 2 states have call successors, (4), 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 167 [2021-05-02 12:57:13,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:57:13,758 INFO L225 Difference]: With dead ends: 208 [2021-05-02 12:57:13,758 INFO L226 Difference]: Without dead ends: 173 [2021-05-02 12:57:13,759 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 128 SyntacticMatches, 42 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 987 ImplicationChecksByTransitivity, 3413.1ms TimeCoverageRelationStatistics Valid=349, Invalid=7661, Unknown=0, NotChecked=0, Total=8010 [2021-05-02 12:57:13,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2021-05-02 12:57:13,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 172. [2021-05-02 12:57:13,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 172 states, 167 states have (on average 1.0718562874251496) internal successors, (179), 167 states have internal predecessors, (179), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:13,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 183 transitions. [2021-05-02 12:57:13,766 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 183 transitions. Word has length 167 [2021-05-02 12:57:13,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:57:13,766 INFO L480 AbstractCegarLoop]: Abstraction has 172 states and 183 transitions. [2021-05-02 12:57:13,766 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 3.021276595744681) internal successors, (142), 46 states have internal predecessors, (142), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:13,766 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 183 transitions. [2021-05-02 12:57:13,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2021-05-02 12:57:13,767 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:57:13,767 INFO L523 BasicCegarLoop]: trace histogram [53, 53, 43, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:57:13,967 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2021-05-02 12:57:13,968 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:57:13,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:57:13,968 INFO L82 PathProgramCache]: Analyzing trace with hash -2112790835, now seen corresponding path program 30 times [2021-05-02 12:57:13,968 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:57:13,968 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1326155497] [2021-05-02 12:57:13,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:57:14,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:57:14,962 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:57:14,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:57:14,973 INFO L134 CoverageAnalysis]: Checked inductivity of 4187 backedges. 1266 proven. 2795 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-02 12:57:14,973 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:57:14,973 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1326155497] [2021-05-02 12:57:14,973 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1326155497] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:57:14,974 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [295142159] [2021-05-02 12:57:14,974 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 12:57:18,412 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 31 check-sat command(s) [2021-05-02 12:57:18,413 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:57:18,418 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 12:57:18,420 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:57:19,118 INFO L134 CoverageAnalysis]: Checked inductivity of 4187 backedges. 0 proven. 1392 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2021-05-02 12:57:19,119 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [295142159] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:57:19,119 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:57:19,119 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 15] total 60 [2021-05-02 12:57:19,119 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1972043255] [2021-05-02 12:57:19,119 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2021-05-02 12:57:19,119 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:57:19,120 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-05-02 12:57:19,120 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=160, Invalid=3380, Unknown=0, NotChecked=0, Total=3540 [2021-05-02 12:57:19,120 INFO L87 Difference]: Start difference. First operand 172 states and 183 transitions. Second operand has 60 states, 60 states have (on average 2.966666666666667) internal successors, (178), 58 states have internal predecessors, (178), 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 12:57:25,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:57:25,241 INFO L93 Difference]: Finished difference Result 217 states and 241 transitions. [2021-05-02 12:57:25,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2021-05-02 12:57:25,241 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 2.966666666666667) internal successors, (178), 58 states have internal predecessors, (178), 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 170 [2021-05-02 12:57:25,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:57:25,242 INFO L225 Difference]: With dead ends: 217 [2021-05-02 12:57:25,242 INFO L226 Difference]: Without dead ends: 179 [2021-05-02 12:57:25,243 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 161 SyntacticMatches, 0 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1609 ImplicationChecksByTransitivity, 3991.4ms TimeCoverageRelationStatistics Valid=564, Invalid=13008, Unknown=0, NotChecked=0, Total=13572 [2021-05-02 12:57:25,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2021-05-02 12:57:25,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 178. [2021-05-02 12:57:25,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178 states, 173 states have (on average 1.0751445086705202) internal successors, (186), 173 states have internal predecessors, (186), 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 12:57:25,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 190 transitions. [2021-05-02 12:57:25,249 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 190 transitions. Word has length 170 [2021-05-02 12:57:25,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:57:25,250 INFO L480 AbstractCegarLoop]: Abstraction has 178 states and 190 transitions. [2021-05-02 12:57:25,250 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 60 states, 60 states have (on average 2.966666666666667) internal successors, (178), 58 states have internal predecessors, (178), 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 12:57:25,250 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 190 transitions. [2021-05-02 12:57:25,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2021-05-02 12:57:25,250 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:57:25,250 INFO L523 BasicCegarLoop]: trace histogram [55, 55, 44, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:57:25,455 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:57:25,455 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:57:25,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:57:25,456 INFO L82 PathProgramCache]: Analyzing trace with hash -348660725, now seen corresponding path program 31 times [2021-05-02 12:57:25,456 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:57:25,456 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [777814536] [2021-05-02 12:57:25,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:57:25,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:57:26,565 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:57:26,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:57:26,569 INFO L134 CoverageAnalysis]: Checked inductivity of 4510 backedges. 1429 proven. 2926 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 12:57:26,570 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:57:26,570 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [777814536] [2021-05-02 12:57:26,570 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [777814536] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:57:26,570 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [646120699] [2021-05-02 12:57:26,570 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 12:57:26,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:57:26,651 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 91 conjunts are in the unsatisfiable core [2021-05-02 12:57:26,653 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:57:26,906 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:57:26,937 INFO L134 CoverageAnalysis]: Checked inductivity of 4510 backedges. 1429 proven. 2926 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 12:57:26,938 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [646120699] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:57:26,938 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:57:26,938 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 47] total 49 [2021-05-02 12:57:26,938 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [896809540] [2021-05-02 12:57:26,938 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-02 12:57:26,938 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:57:26,939 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-02 12:57:26,939 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=2212, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 12:57:26,939 INFO L87 Difference]: Start difference. First operand 178 states and 190 transitions. Second operand has 49 states, 49 states have (on average 3.020408163265306) internal successors, (148), 48 states have internal predecessors, (148), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:31,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:57:31,099 INFO L93 Difference]: Finished difference Result 220 states and 244 transitions. [2021-05-02 12:57:31,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-05-02 12:57:31,099 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 3.020408163265306) internal successors, (148), 48 states have internal predecessors, (148), 2 states have call successors, (4), 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 176 [2021-05-02 12:57:31,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:57:31,100 INFO L225 Difference]: With dead ends: 220 [2021-05-02 12:57:31,100 INFO L226 Difference]: Without dead ends: 182 [2021-05-02 12:57:31,101 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 271 GetRequests, 178 SyntacticMatches, 1 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 994 ImplicationChecksByTransitivity, 2845.1ms TimeCoverageRelationStatistics Valid=365, Invalid=8377, Unknown=0, NotChecked=0, Total=8742 [2021-05-02 12:57:31,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2021-05-02 12:57:31,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 181. [2021-05-02 12:57:31,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181 states, 176 states have (on average 1.0738636363636365) internal successors, (189), 176 states have internal predecessors, (189), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:31,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 193 transitions. [2021-05-02 12:57:31,107 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 193 transitions. Word has length 176 [2021-05-02 12:57:31,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:57:31,107 INFO L480 AbstractCegarLoop]: Abstraction has 181 states and 193 transitions. [2021-05-02 12:57:31,108 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 49 states have (on average 3.020408163265306) internal successors, (148), 48 states have internal predecessors, (148), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:31,108 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 193 transitions. [2021-05-02 12:57:31,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2021-05-02 12:57:31,108 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:57:31,108 INFO L523 BasicCegarLoop]: trace histogram [56, 56, 45, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:57:31,320 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-05-02 12:57:31,321 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:57:31,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:57:31,322 INFO L82 PathProgramCache]: Analyzing trace with hash -507750399, now seen corresponding path program 32 times [2021-05-02 12:57:31,322 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:57:31,322 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1214217433] [2021-05-02 12:57:31,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:57:31,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:57:32,447 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:57:32,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:57:32,457 INFO L134 CoverageAnalysis]: Checked inductivity of 4676 backedges. 1461 proven. 3060 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 12:57:32,458 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:57:32,458 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1214217433] [2021-05-02 12:57:32,458 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1214217433] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:57:32,458 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [676134752] [2021-05-02 12:57:32,458 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 12:57:32,537 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:57:32,537 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:57:32,540 INFO L263 TraceCheckSpWp]: Trace formula consists of 335 conjuncts, 93 conjunts are in the unsatisfiable core [2021-05-02 12:57:32,542 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:57:32,788 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:57:32,822 INFO L134 CoverageAnalysis]: Checked inductivity of 4676 backedges. 1461 proven. 3060 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 12:57:32,822 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [676134752] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:57:32,822 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:57:32,822 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 48] total 50 [2021-05-02 12:57:32,822 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1531859559] [2021-05-02 12:57:32,822 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-02 12:57:32,823 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:57:32,823 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-02 12:57:32,823 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=2307, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 12:57:32,823 INFO L87 Difference]: Start difference. First operand 181 states and 193 transitions. Second operand has 50 states, 50 states have (on average 3.02) internal successors, (151), 49 states have internal predecessors, (151), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:37,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:57:37,019 INFO L93 Difference]: Finished difference Result 223 states and 247 transitions. [2021-05-02 12:57:37,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-02 12:57:37,020 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 3.02) internal successors, (151), 49 states have internal predecessors, (151), 2 states have call successors, (4), 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 179 [2021-05-02 12:57:37,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:57:37,021 INFO L225 Difference]: With dead ends: 223 [2021-05-02 12:57:37,021 INFO L226 Difference]: Without dead ends: 185 [2021-05-02 12:57:37,022 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 181 SyntacticMatches, 1 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1039 ImplicationChecksByTransitivity, 2854.8ms TimeCoverageRelationStatistics Valid=373, Invalid=8747, Unknown=0, NotChecked=0, Total=9120 [2021-05-02 12:57:37,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-05-02 12:57:37,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 184. [2021-05-02 12:57:37,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 184 states, 179 states have (on average 1.0726256983240223) internal successors, (192), 179 states have internal predecessors, (192), 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 12:57:37,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 196 transitions. [2021-05-02 12:57:37,028 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 196 transitions. Word has length 179 [2021-05-02 12:57:37,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:57:37,028 INFO L480 AbstractCegarLoop]: Abstraction has 184 states and 196 transitions. [2021-05-02 12:57:37,028 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 3.02) internal successors, (151), 49 states have internal predecessors, (151), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:37,028 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 196 transitions. [2021-05-02 12:57:37,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2021-05-02 12:57:37,029 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:57:37,029 INFO L523 BasicCegarLoop]: trace histogram [57, 57, 46, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:57:37,244 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-05-02 12:57:37,245 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:57:37,245 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:57:37,245 INFO L82 PathProgramCache]: Analyzing trace with hash 1695666251, now seen corresponding path program 33 times [2021-05-02 12:57:37,245 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:57:37,245 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1109428433] [2021-05-02 12:57:37,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:57:37,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:57:38,430 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:57:38,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:57:38,445 INFO L134 CoverageAnalysis]: Checked inductivity of 4845 backedges. 1493 proven. 3197 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 12:57:38,446 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:57:38,446 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1109428433] [2021-05-02 12:57:38,446 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1109428433] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:57:38,446 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1772219318] [2021-05-02 12:57:38,446 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 12:57:38,623 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2021-05-02 12:57:38,624 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:57:38,625 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 30 conjunts are in the unsatisfiable core [2021-05-02 12:57:38,627 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:57:39,387 INFO L134 CoverageAnalysis]: Checked inductivity of 4845 backedges. 0 proven. 1648 refuted. 0 times theorem prover too weak. 3197 trivial. 0 not checked. [2021-05-02 12:57:39,387 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1772219318] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:57:39,387 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:57:39,388 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 16] total 64 [2021-05-02 12:57:39,388 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1634222536] [2021-05-02 12:57:39,388 INFO L460 AbstractCegarLoop]: Interpolant automaton has 64 states [2021-05-02 12:57:39,388 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:57:39,388 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-05-02 12:57:39,388 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=3861, Unknown=0, NotChecked=0, Total=4032 [2021-05-02 12:57:39,389 INFO L87 Difference]: Start difference. First operand 184 states and 196 transitions. Second operand has 64 states, 64 states have (on average 2.96875) internal successors, (190), 62 states have internal predecessors, (190), 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 12:57:45,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:57:45,719 INFO L93 Difference]: Finished difference Result 232 states and 258 transitions. [2021-05-02 12:57:45,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-05-02 12:57:45,720 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 2.96875) internal successors, (190), 62 states have internal predecessors, (190), 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 182 [2021-05-02 12:57:45,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:57:45,720 INFO L225 Difference]: With dead ends: 232 [2021-05-02 12:57:45,721 INFO L226 Difference]: Without dead ends: 191 [2021-05-02 12:57:45,721 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 295 GetRequests, 172 SyntacticMatches, 0 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1844 ImplicationChecksByTransitivity, 4536.9ms TimeCoverageRelationStatistics Valid=603, Invalid=14897, Unknown=0, NotChecked=0, Total=15500 [2021-05-02 12:57:45,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2021-05-02 12:57:45,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 190. [2021-05-02 12:57:45,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 190 states, 185 states have (on average 1.0756756756756756) internal successors, (199), 185 states have internal predecessors, (199), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:45,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 203 transitions. [2021-05-02 12:57:45,728 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 203 transitions. Word has length 182 [2021-05-02 12:57:45,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:57:45,728 INFO L480 AbstractCegarLoop]: Abstraction has 190 states and 203 transitions. [2021-05-02 12:57:45,728 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 64 states, 64 states have (on average 2.96875) internal successors, (190), 62 states have internal predecessors, (190), 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 12:57:45,728 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 203 transitions. [2021-05-02 12:57:45,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2021-05-02 12:57:45,729 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:57:45,729 INFO L523 BasicCegarLoop]: trace histogram [59, 59, 47, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:57:45,933 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-05-02 12:57:45,933 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:57:45,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:57:45,933 INFO L82 PathProgramCache]: Analyzing trace with hash 1408742093, now seen corresponding path program 34 times [2021-05-02 12:57:45,933 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:57:45,934 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [437546472] [2021-05-02 12:57:45,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:57:45,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:57:47,184 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:57:47,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:57:47,197 INFO L134 CoverageAnalysis]: Checked inductivity of 5192 backedges. 1668 proven. 3337 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2021-05-02 12:57:47,198 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:57:47,198 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [437546472] [2021-05-02 12:57:47,198 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [437546472] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:57:47,198 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1879749061] [2021-05-02 12:57:47,198 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 12:57:47,278 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:57:47,279 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:57:47,281 INFO L263 TraceCheckSpWp]: Trace formula consists of 349 conjuncts, 97 conjunts are in the unsatisfiable core [2021-05-02 12:57:47,283 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:57:47,535 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:57:47,580 INFO L134 CoverageAnalysis]: Checked inductivity of 5192 backedges. 1668 proven. 3337 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2021-05-02 12:57:47,581 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1879749061] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:57:47,581 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:57:47,581 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 50] total 52 [2021-05-02 12:57:47,581 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [589328865] [2021-05-02 12:57:47,581 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2021-05-02 12:57:47,581 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:57:47,582 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-05-02 12:57:47,582 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=2503, Unknown=0, NotChecked=0, Total=2652 [2021-05-02 12:57:47,582 INFO L87 Difference]: Start difference. First operand 190 states and 203 transitions. Second operand has 52 states, 52 states have (on average 3.019230769230769) internal successors, (157), 51 states have internal predecessors, (157), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:52,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:57:52,290 INFO L93 Difference]: Finished difference Result 235 states and 261 transitions. [2021-05-02 12:57:52,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-02 12:57:52,291 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 3.019230769230769) internal successors, (157), 51 states have internal predecessors, (157), 2 states have call successors, (4), 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 188 [2021-05-02 12:57:52,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:57:52,291 INFO L225 Difference]: With dead ends: 235 [2021-05-02 12:57:52,291 INFO L226 Difference]: Without dead ends: 194 [2021-05-02 12:57:52,292 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 190 SyntacticMatches, 1 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1132 ImplicationChecksByTransitivity, 3134.2ms TimeCoverageRelationStatistics Valid=389, Invalid=9511, Unknown=0, NotChecked=0, Total=9900 [2021-05-02 12:57:52,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2021-05-02 12:57:52,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 193. [2021-05-02 12:57:52,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 188 states have (on average 1.074468085106383) internal successors, (202), 188 states have internal predecessors, (202), 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 12:57:52,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 206 transitions. [2021-05-02 12:57:52,302 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 206 transitions. Word has length 188 [2021-05-02 12:57:52,303 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:57:52,303 INFO L480 AbstractCegarLoop]: Abstraction has 193 states and 206 transitions. [2021-05-02 12:57:52,303 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 52 states, 52 states have (on average 3.019230769230769) internal successors, (157), 51 states have internal predecessors, (157), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:52,303 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 206 transitions. [2021-05-02 12:57:52,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2021-05-02 12:57:52,303 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:57:52,304 INFO L523 BasicCegarLoop]: trace histogram [60, 60, 48, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:57:52,516 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-05-02 12:57:52,517 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:57:52,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:57:52,517 INFO L82 PathProgramCache]: Analyzing trace with hash -897323581, now seen corresponding path program 35 times [2021-05-02 12:57:52,517 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:57:52,517 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1897353678] [2021-05-02 12:57:52,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:57:52,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:57:53,769 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:57:53,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:57:53,781 INFO L134 CoverageAnalysis]: Checked inductivity of 5370 backedges. 1703 proven. 3480 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2021-05-02 12:57:53,782 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:57:53,782 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1897353678] [2021-05-02 12:57:53,782 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1897353678] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:57:53,782 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1774057394] [2021-05-02 12:57:53,782 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