/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/eureka_01-2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 11:49:47,250 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 11:49:47,251 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 11:49:47,273 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 11:49:47,296 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 11:49:47,296 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 11:49:47,297 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 11:49:47,298 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 11:49:47,298 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 11:49:47,299 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 11:49:47,300 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 11:49:47,302 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 11:49:47,303 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 11:49:47,304 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 11:49:47,304 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 11:49:47,305 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 11:49:47,307 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 11:49:47,313 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 11:49:47,313 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 11:49:47,314 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 11:49:47,314 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2021-05-02 11:49:47,329 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 11:49:47,330 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 11:49:47,330 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 11:49:47,331 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 11:49:47,331 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 11:49:47,331 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 11:49:47,331 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 11:49:47,331 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 11:49:47,331 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 11:49:47,331 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 11:49:47,331 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 11:49:47,332 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 11:49:47,332 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 11:49:47,332 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 11:49:47,332 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 11:49:47,332 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 11:49:47,332 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 11:49:47,332 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 11:49:47,332 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 11:49:47,332 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 11:49:47,333 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 11:49:47,333 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 11:49:47,333 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 11:49:47,333 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 11:49:47,333 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 11:49:47,333 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 11:49:47,333 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 11:49:47,333 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 11:49:47,333 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 11:49:47,567 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 11:49:47,583 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 11:49:47,584 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 11:49:47,585 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 11:49:47,587 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 11:49:47,587 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/eureka_01-2.c [2021-05-02 11:49:47,634 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e8e51c4ba/dd3e78709b1740e395be7d65267a9017/FLAGeb01a4055 [2021-05-02 11:49:47,931 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 11:49:47,931 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/eureka_01-2.c [2021-05-02 11:49:47,935 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e8e51c4ba/dd3e78709b1740e395be7d65267a9017/FLAGeb01a4055 [2021-05-02 11:49:48,371 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e8e51c4ba/dd3e78709b1740e395be7d65267a9017 [2021-05-02 11:49:48,378 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 11:49:48,380 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 11:49:48,383 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 11:49:48,383 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 11:49:48,385 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 11:49:48,386 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 11:49:48" (1/1) ... [2021-05-02 11:49:48,388 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@19bb7574 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:48, skipping insertion in model container [2021-05-02 11:49:48,388 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 11:49:48" (1/1) ... [2021-05-02 11:49:48,392 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 11:49:48,403 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 11:49:48,516 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/eureka_01-2.c[323,336] [2021-05-02 11:49:48,557 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 11:49:48,562 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 11:49:48,594 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/eureka_01-2.c[323,336] [2021-05-02 11:49:48,631 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 11:49:48,639 INFO L208 MainTranslator]: Completed translation [2021-05-02 11:49:48,640 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:48 WrapperNode [2021-05-02 11:49:48,640 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 11:49:48,643 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 11:49:48,643 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 11:49:48,646 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 11:49:48,654 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:48" (1/1) ... [2021-05-02 11:49:48,654 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:48" (1/1) ... [2021-05-02 11:49:48,667 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:48" (1/1) ... [2021-05-02 11:49:48,667 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:48" (1/1) ... [2021-05-02 11:49:48,683 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:48" (1/1) ... [2021-05-02 11:49:48,686 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:48" (1/1) ... [2021-05-02 11:49:48,688 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:48" (1/1) ... [2021-05-02 11:49:48,689 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 11:49:48,690 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 11:49:48,690 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 11:49:48,690 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 11:49:48,690 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:48" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 11:49:48,768 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 11:49:48,768 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 11:49:48,768 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 11:49:48,768 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 11:49:48,768 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 11:49:48,769 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 11:49:48,769 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 11:49:48,769 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 11:49:48,769 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 11:49:48,769 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 11:49:48,769 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 11:49:48,769 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 11:49:48,769 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 11:49:48,769 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 11:49:48,769 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 11:49:48,769 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 11:49:48,769 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 11:49:48,966 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 11:49:48,967 INFO L299 CfgBuilder]: Removed 5 assume(true) statements. [2021-05-02 11:49:48,967 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 11:49:48 BoogieIcfgContainer [2021-05-02 11:49:48,968 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 11:49:48,969 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 11:49:48,969 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 11:49:48,970 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 11:49:48,971 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 11:49:48" (1/3) ... [2021-05-02 11:49:48,971 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@43dd0a88 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 11:49:48, skipping insertion in model container [2021-05-02 11:49:48,971 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:48" (2/3) ... [2021-05-02 11:49:48,971 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@43dd0a88 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 11:49:48, skipping insertion in model container [2021-05-02 11:49:48,971 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 11:49:48" (3/3) ... [2021-05-02 11:49:48,972 INFO L111 eAbstractionObserver]: Analyzing ICFG eureka_01-2.c [2021-05-02 11:49:48,976 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 11:49:48,982 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 11:49:48,993 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 11:49:49,030 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 11:49:49,030 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 11:49:49,030 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 11:49:49,031 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 11:49:49,031 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 11:49:49,031 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 11:49:49,031 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 11:49:49,031 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 11:49:49,041 INFO L276 IsEmpty]: Start isEmpty. Operand has 35 states, 27 states have (on average 1.5555555555555556) internal successors, (42), 28 states have internal predecessors, (42), 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 11:49:49,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 11:49:49,044 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:49,044 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:49,045 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:49,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:49,048 INFO L82 PathProgramCache]: Analyzing trace with hash -10776725, now seen corresponding path program 1 times [2021-05-02 11:49:49,053 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:49,054 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [398049867] [2021-05-02 11:49:49,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:49,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:49,246 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:49,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:49,264 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:49:49,264 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:49,264 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [398049867] [2021-05-02 11:49:49,265 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [398049867] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 11:49:49,265 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 11:49:49,265 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 11:49:49,265 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2102601344] [2021-05-02 11:49:49,268 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 11:49:49,268 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:49:49,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 11:49:49,277 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 11:49:49,279 INFO L87 Difference]: Start difference. First operand has 35 states, 27 states have (on average 1.5555555555555556) internal successors, (42), 28 states have internal predecessors, (42), 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 4.333333333333333) internal successors, (13), 2 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:49,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:49:49,351 INFO L93 Difference]: Finished difference Result 61 states and 85 transitions. [2021-05-02 11:49:49,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 11:49:49,353 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 2 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-02 11:49:49,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:49:49,358 INFO L225 Difference]: With dead ends: 61 [2021-05-02 11:49:49,358 INFO L226 Difference]: Without dead ends: 30 [2021-05-02 11:49:49,361 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 54.0ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 11:49:49,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-02 11:49:49,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-05-02 11:49:49,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 24 states have (on average 1.2916666666666667) internal successors, (31), 24 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 11:49:49,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 36 transitions. [2021-05-02 11:49:49,391 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 36 transitions. Word has length 17 [2021-05-02 11:49:49,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:49:49,391 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 36 transitions. [2021-05-02 11:49:49,391 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 2 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:49,391 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 36 transitions. [2021-05-02 11:49:49,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 11:49:49,392 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:49,392 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:49,392 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 11:49:49,392 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:49,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:49,393 INFO L82 PathProgramCache]: Analyzing trace with hash -2004250474, now seen corresponding path program 1 times [2021-05-02 11:49:49,393 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:49,393 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2052191231] [2021-05-02 11:49:49,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:49,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:49,485 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:49,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:49,504 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:49:49,505 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:49,505 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2052191231] [2021-05-02 11:49:49,505 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2052191231] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 11:49:49,505 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 11:49:49,505 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 11:49:49,505 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1135151899] [2021-05-02 11:49:49,506 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 11:49:49,506 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:49:49,507 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 11:49:49,507 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 11:49:49,507 INFO L87 Difference]: Start difference. First operand 30 states and 36 transitions. Second operand has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:49,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:49:49,586 INFO L93 Difference]: Finished difference Result 54 states and 66 transitions. [2021-05-02 11:49:49,586 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 11:49:49,586 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-02 11:49:49,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:49:49,587 INFO L225 Difference]: With dead ends: 54 [2021-05-02 11:49:49,587 INFO L226 Difference]: Without dead ends: 33 [2021-05-02 11:49:49,588 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 24.8ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 11:49:49,588 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-02 11:49:49,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2021-05-02 11:49:49,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 25 states have (on average 1.28) internal successors, (32), 25 states have internal predecessors, (32), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 11:49:49,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 37 transitions. [2021-05-02 11:49:49,592 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 37 transitions. Word has length 17 [2021-05-02 11:49:49,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:49:49,592 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 37 transitions. [2021-05-02 11:49:49,592 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:49,592 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 37 transitions. [2021-05-02 11:49:49,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 11:49:49,593 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:49,593 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:49,593 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 11:49:49,593 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:49,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:49,593 INFO L82 PathProgramCache]: Analyzing trace with hash 1025073247, now seen corresponding path program 1 times [2021-05-02 11:49:49,594 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:49,594 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [533005322] [2021-05-02 11:49:49,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:49,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:49,647 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:49,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:49,656 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 11:49:49,656 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:49,656 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [533005322] [2021-05-02 11:49:49,656 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [533005322] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 11:49:49,656 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 11:49:49,657 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 11:49:49,657 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1053580914] [2021-05-02 11:49:49,657 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 11:49:49,657 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:49:49,657 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 11:49:49,658 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 11:49:49,658 INFO L87 Difference]: Start difference. First operand 31 states and 37 transitions. Second operand has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:49,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:49:49,748 INFO L93 Difference]: Finished difference Result 61 states and 74 transitions. [2021-05-02 11:49:49,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 11:49:49,749 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 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 20 [2021-05-02 11:49:49,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:49:49,750 INFO L225 Difference]: With dead ends: 61 [2021-05-02 11:49:49,750 INFO L226 Difference]: Without dead ends: 46 [2021-05-02 11:49:49,751 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 22.6ms TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 11:49:49,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-05-02 11:49:49,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 32. [2021-05-02 11:49:49,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 26 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 11:49:49,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 38 transitions. [2021-05-02 11:49:49,756 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 38 transitions. Word has length 20 [2021-05-02 11:49:49,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:49:49,756 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 38 transitions. [2021-05-02 11:49:49,757 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:49,757 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 38 transitions. [2021-05-02 11:49:49,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 11:49:49,757 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:49,757 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:49,757 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 11:49:49,757 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:49,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:49,758 INFO L82 PathProgramCache]: Analyzing trace with hash -315835948, now seen corresponding path program 1 times [2021-05-02 11:49:49,758 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:49,758 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1465579017] [2021-05-02 11:49:49,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:49,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:49,823 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:49,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:49,831 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 11:49:49,831 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:49,831 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1465579017] [2021-05-02 11:49:49,832 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1465579017] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 11:49:49,832 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 11:49:49,832 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 11:49:49,833 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [577969047] [2021-05-02 11:49:49,834 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 11:49:49,834 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:49:49,834 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 11:49:49,835 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 11:49:49,835 INFO L87 Difference]: Start difference. First operand 32 states and 38 transitions. Second operand has 5 states, 5 states have (on average 3.8) internal successors, (19), 4 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:49,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:49:49,898 INFO L93 Difference]: Finished difference Result 55 states and 67 transitions. [2021-05-02 11:49:49,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 11:49:49,898 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 4 states have internal predecessors, (19), 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 23 [2021-05-02 11:49:49,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:49:49,901 INFO L225 Difference]: With dead ends: 55 [2021-05-02 11:49:49,902 INFO L226 Difference]: Without dead ends: 35 [2021-05-02 11:49:49,902 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 25.5ms TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 11:49:49,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-02 11:49:49,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 33. [2021-05-02 11:49:49,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 27 states have (on average 1.2592592592592593) internal successors, (34), 27 states have internal predecessors, (34), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 11:49:49,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 39 transitions. [2021-05-02 11:49:49,908 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 39 transitions. Word has length 23 [2021-05-02 11:49:49,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:49:49,908 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 39 transitions. [2021-05-02 11:49:49,908 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 4 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:49,908 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 39 transitions. [2021-05-02 11:49:49,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 11:49:49,909 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:49,909 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:49,909 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-02 11:49:49,909 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:49,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:49,909 INFO L82 PathProgramCache]: Analyzing trace with hash -873463802, now seen corresponding path program 1 times [2021-05-02 11:49:49,909 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:49,909 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [841107104] [2021-05-02 11:49:49,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:49,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:49,965 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:49,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:49,973 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 11:49:49,974 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:49,974 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [841107104] [2021-05-02 11:49:49,974 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [841107104] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 11:49:49,974 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 11:49:49,974 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 11:49:49,974 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2073977065] [2021-05-02 11:49:49,975 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 11:49:49,975 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:49:49,976 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 11:49:49,976 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 11:49:49,976 INFO L87 Difference]: Start difference. First operand 33 states and 39 transitions. Second operand has 5 states, 5 states have (on average 4.4) internal successors, (22), 4 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:50,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:49:50,045 INFO L93 Difference]: Finished difference Result 58 states and 69 transitions. [2021-05-02 11:49:50,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 11:49:50,047 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 4 states have internal predecessors, (22), 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 26 [2021-05-02 11:49:50,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:49:50,047 INFO L225 Difference]: With dead ends: 58 [2021-05-02 11:49:50,047 INFO L226 Difference]: Without dead ends: 47 [2021-05-02 11:49:50,048 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 20.2ms TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 11:49:50,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-05-02 11:49:50,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 34. [2021-05-02 11:49:50,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 28 states have (on average 1.25) internal successors, (35), 28 states have internal predecessors, (35), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 11:49:50,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 40 transitions. [2021-05-02 11:49:50,070 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 40 transitions. Word has length 26 [2021-05-02 11:49:50,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:49:50,070 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 40 transitions. [2021-05-02 11:49:50,070 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 4 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:50,071 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 40 transitions. [2021-05-02 11:49:50,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 11:49:50,071 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:50,071 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:50,071 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-05-02 11:49:50,071 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:50,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:50,072 INFO L82 PathProgramCache]: Analyzing trace with hash -1835268693, now seen corresponding path program 1 times [2021-05-02 11:49:50,072 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:50,072 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1356697045] [2021-05-02 11:49:50,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:50,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:50,142 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:50,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:50,150 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 11:49:50,151 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:50,152 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1356697045] [2021-05-02 11:49:50,152 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1356697045] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:50,152 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [63070385] [2021-05-02 11:49:50,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:49:50,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:50,252 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 11:49:50,256 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:49:50,325 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:50,332 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:50,350 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:50,379 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 11:49:50,379 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [63070385] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:50,379 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:49:50,379 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 7 [2021-05-02 11:49:50,379 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1814237955] [2021-05-02 11:49:50,380 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 11:49:50,380 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:49:50,380 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 11:49:50,381 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 11:49:50,381 INFO L87 Difference]: Start difference. First operand 34 states and 40 transitions. Second operand has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 6 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:50,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:49:50,464 INFO L93 Difference]: Finished difference Result 63 states and 76 transitions. [2021-05-02 11:49:50,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 11:49:50,464 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 6 states have internal predecessors, (31), 2 states have call successors, (4), 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 11:49:50,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:49:50,465 INFO L225 Difference]: With dead ends: 63 [2021-05-02 11:49:50,465 INFO L226 Difference]: Without dead ends: 39 [2021-05-02 11:49:50,465 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 40.0ms TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 11:49:50,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-05-02 11:49:50,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 37. [2021-05-02 11:49:50,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 31 states have (on average 1.2580645161290323) internal successors, (39), 31 states have internal predecessors, (39), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 11:49:50,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 44 transitions. [2021-05-02 11:49:50,468 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 44 transitions. Word has length 29 [2021-05-02 11:49:50,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:49:50,468 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 44 transitions. [2021-05-02 11:49:50,468 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 6 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:50,468 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 44 transitions. [2021-05-02 11:49:50,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 11:49:50,469 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:50,469 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:50,677 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-05-02 11:49:50,677 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:50,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:50,677 INFO L82 PathProgramCache]: Analyzing trace with hash 533557236, now seen corresponding path program 2 times [2021-05-02 11:49:50,677 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:50,678 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [170150340] [2021-05-02 11:49:50,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:50,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:50,721 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:50,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:50,725 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 11:49:50,725 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:50,725 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [170150340] [2021-05-02 11:49:50,725 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [170150340] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:50,725 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [566201213] [2021-05-02 11:49:50,725 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:49:50,793 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 11:49:50,794 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:49:50,795 INFO L263 TraceCheckSpWp]: Trace formula consists of 305 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 11:49:50,796 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:49:50,818 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:50,819 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:50,830 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:50,849 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 11:49:50,849 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [566201213] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 11:49:50,849 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 11:49:50,849 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 7 [2021-05-02 11:49:50,850 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [733399058] [2021-05-02 11:49:50,850 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 11:49:50,850 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:49:50,850 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 11:49:50,850 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-02 11:49:50,850 INFO L87 Difference]: Start difference. First operand 37 states and 44 transitions. Second operand has 4 states, 4 states have (on average 7.0) internal successors, (28), 4 states have internal predecessors, (28), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:50,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:49:50,882 INFO L93 Difference]: Finished difference Result 75 states and 91 transitions. [2021-05-02 11:49:50,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 11:49:50,882 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.0) internal successors, (28), 4 states have internal predecessors, (28), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2021-05-02 11:49:50,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:49:50,883 INFO L225 Difference]: With dead ends: 75 [2021-05-02 11:49:50,883 INFO L226 Difference]: Without dead ends: 48 [2021-05-02 11:49:50,883 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 31.8ms TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-02 11:49:50,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-02 11:49:50,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 37. [2021-05-02 11:49:50,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 31 states have (on average 1.2258064516129032) internal successors, (38), 31 states have internal predecessors, (38), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 11:49:50,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 43 transitions. [2021-05-02 11:49:50,887 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 43 transitions. Word has length 32 [2021-05-02 11:49:50,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:49:50,887 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 43 transitions. [2021-05-02 11:49:50,887 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 7.0) internal successors, (28), 4 states have internal predecessors, (28), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:50,887 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 43 transitions. [2021-05-02 11:49:50,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 11:49:50,887 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:50,888 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:51,103 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:49:51,104 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:51,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:51,104 INFO L82 PathProgramCache]: Analyzing trace with hash 752411954, now seen corresponding path program 1 times [2021-05-02 11:49:51,104 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:51,104 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1923277743] [2021-05-02 11:49:51,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:51,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:51,156 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:51,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:51,162 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 11:49:51,162 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:51,162 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1923277743] [2021-05-02 11:49:51,162 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1923277743] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:51,162 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [401970698] [2021-05-02 11:49:51,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:49:51,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:51,237 INFO L263 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 11:49:51,240 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:49:51,269 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:51,272 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:51,289 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:51,292 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:51,304 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:51,323 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 11:49:51,324 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [401970698] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:51,324 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:49:51,324 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 9 [2021-05-02 11:49:51,324 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [878051094] [2021-05-02 11:49:51,325 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 11:49:51,325 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:49:51,325 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 11:49:51,326 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=43, Unknown=0, NotChecked=0, Total=72 [2021-05-02 11:49:51,326 INFO L87 Difference]: Start difference. First operand 37 states and 43 transitions. Second operand has 9 states, 9 states have (on average 4.111111111111111) internal successors, (37), 8 states have internal predecessors, (37), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:51,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:49:51,397 INFO L93 Difference]: Finished difference Result 66 states and 77 transitions. [2021-05-02 11:49:51,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 11:49:51,397 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 4.111111111111111) internal successors, (37), 8 states have internal predecessors, (37), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2021-05-02 11:49:51,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:49:51,400 INFO L225 Difference]: With dead ends: 66 [2021-05-02 11:49:51,400 INFO L226 Difference]: Without dead ends: 42 [2021-05-02 11:49:51,400 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 41.9ms TimeCoverageRelationStatistics Valid=29, Invalid=43, Unknown=0, NotChecked=0, Total=72 [2021-05-02 11:49:51,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-02 11:49:51,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2021-05-02 11:49:51,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 34 states have (on average 1.2058823529411764) internal successors, (41), 34 states have internal predecessors, (41), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 11:49:51,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 46 transitions. [2021-05-02 11:49:51,412 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 46 transitions. Word has length 32 [2021-05-02 11:49:51,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:49:51,412 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 46 transitions. [2021-05-02 11:49:51,413 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 4.111111111111111) internal successors, (37), 8 states have internal predecessors, (37), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:51,413 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 46 transitions. [2021-05-02 11:49:51,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 11:49:51,416 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:51,416 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:51,632 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:49:51,632 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:51,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:51,632 INFO L82 PathProgramCache]: Analyzing trace with hash -21429173, now seen corresponding path program 2 times [2021-05-02 11:49:51,632 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:51,632 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1151342173] [2021-05-02 11:49:51,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:51,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:51,680 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:51,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:51,686 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 11:49:51,686 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:51,686 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1151342173] [2021-05-02 11:49:51,686 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1151342173] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:51,686 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1401454724] [2021-05-02 11:49:51,686 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:49:51,747 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 11:49:51,747 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:49:51,749 INFO L263 TraceCheckSpWp]: Trace formula consists of 309 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 11:49:51,750 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:49:51,771 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:51,773 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:51,789 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:51,794 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:51,807 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:51,810 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:51,822 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:51,839 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 11:49:51,840 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1401454724] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:51,840 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:49:51,840 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 11 [2021-05-02 11:49:51,840 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1657747687] [2021-05-02 11:49:51,840 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 11:49:51,840 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:49:51,841 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 11:49:51,841 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=66, Unknown=0, NotChecked=0, Total=110 [2021-05-02 11:49:51,841 INFO L87 Difference]: Start difference. First operand 40 states and 46 transitions. Second operand has 11 states, 11 states have (on average 3.909090909090909) internal successors, (43), 10 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:51,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:49:51,912 INFO L93 Difference]: Finished difference Result 69 states and 80 transitions. [2021-05-02 11:49:51,912 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 11:49:51,913 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.909090909090909) internal successors, (43), 10 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 35 [2021-05-02 11:49:51,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:49:51,915 INFO L225 Difference]: With dead ends: 69 [2021-05-02 11:49:51,915 INFO L226 Difference]: Without dead ends: 45 [2021-05-02 11:49:51,915 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 47.2ms TimeCoverageRelationStatistics Valid=44, Invalid=66, Unknown=0, NotChecked=0, Total=110 [2021-05-02 11:49:51,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-02 11:49:51,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 43. [2021-05-02 11:49:51,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 37 states have (on average 1.1891891891891893) internal successors, (44), 37 states have internal predecessors, (44), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 11:49:51,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 49 transitions. [2021-05-02 11:49:51,924 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 49 transitions. Word has length 35 [2021-05-02 11:49:51,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:49:51,924 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 49 transitions. [2021-05-02 11:49:51,924 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.909090909090909) internal successors, (43), 10 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:51,924 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 49 transitions. [2021-05-02 11:49:51,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 11:49:51,927 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:51,927 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:52,134 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:49:52,134 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:52,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:52,135 INFO L82 PathProgramCache]: Analyzing trace with hash 1862001298, now seen corresponding path program 3 times [2021-05-02 11:49:52,135 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:52,135 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1488124877] [2021-05-02 11:49:52,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:52,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:52,223 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:52,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:52,228 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 11:49:52,228 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:52,228 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1488124877] [2021-05-02 11:49:52,228 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1488124877] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:52,228 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1018063400] [2021-05-02 11:49:52,228 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:49:52,276 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 11:49:52,276 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:49:52,277 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 11:49:52,279 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:49:52,319 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:52,321 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:52,331 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:52,342 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-05-02 11:49:52,342 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1018063400] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:52,342 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:49:52,342 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 5] total 11 [2021-05-02 11:49:52,342 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1407142148] [2021-05-02 11:49:52,343 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 11:49:52,343 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:49:52,343 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 11:49:52,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=67, Unknown=0, NotChecked=0, Total=110 [2021-05-02 11:49:52,343 INFO L87 Difference]: Start difference. First operand 43 states and 49 transitions. Second operand has 11 states, 11 states have (on average 4.454545454545454) internal successors, (49), 10 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 11:49:52,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:49:52,521 INFO L93 Difference]: Finished difference Result 129 states and 160 transitions. [2021-05-02 11:49:52,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 11:49:52,522 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 4.454545454545454) internal successors, (49), 10 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 38 [2021-05-02 11:49:52,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:49:52,523 INFO L225 Difference]: With dead ends: 129 [2021-05-02 11:49:52,523 INFO L226 Difference]: Without dead ends: 105 [2021-05-02 11:49:52,523 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 87.9ms TimeCoverageRelationStatistics Valid=70, Invalid=112, Unknown=0, NotChecked=0, Total=182 [2021-05-02 11:49:52,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-05-02 11:49:52,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 70. [2021-05-02 11:49:52,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 64 states have (on average 1.234375) internal successors, (79), 64 states have internal predecessors, (79), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 11:49:52,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2021-05-02 11:49:52,528 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 38 [2021-05-02 11:49:52,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:49:52,528 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2021-05-02 11:49:52,528 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 4.454545454545454) internal successors, (49), 10 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 11:49:52,529 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2021-05-02 11:49:52,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-05-02 11:49:52,529 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:52,529 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:52,747 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 11:49:52,747 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:52,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:52,747 INFO L82 PathProgramCache]: Analyzing trace with hash -1082760369, now seen corresponding path program 4 times [2021-05-02 11:49:52,748 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:52,748 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1720067832] [2021-05-02 11:49:52,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:52,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:52,829 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:52,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:52,835 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 29 proven. 1 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2021-05-02 11:49:52,835 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:52,836 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1720067832] [2021-05-02 11:49:52,836 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1720067832] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:52,836 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1119236851] [2021-05-02 11:49:52,836 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:49:52,985 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 11:49:52,985 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:49:52,987 INFO L263 TraceCheckSpWp]: Trace formula consists of 403 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 11:49:52,998 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:49:53,039 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:53,041 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:53,058 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:53,092 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 29 proven. 1 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2021-05-02 11:49:53,092 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1119236851] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:53,092 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:49:53,093 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 9 [2021-05-02 11:49:53,093 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [655577965] [2021-05-02 11:49:53,093 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 11:49:53,093 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:49:53,093 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 11:49:53,094 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-05-02 11:49:53,094 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand has 9 states, 9 states have (on average 4.888888888888889) internal successors, (44), 8 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:53,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:49:53,145 INFO L93 Difference]: Finished difference Result 137 states and 176 transitions. [2021-05-02 11:49:53,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 11:49:53,145 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 4.888888888888889) internal successors, (44), 8 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 65 [2021-05-02 11:49:53,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:49:53,146 INFO L225 Difference]: With dead ends: 137 [2021-05-02 11:49:53,146 INFO L226 Difference]: Without dead ends: 95 [2021-05-02 11:49:53,146 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 38.4ms TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-05-02 11:49:53,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-05-02 11:49:53,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 85. [2021-05-02 11:49:53,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 79 states have (on average 1.2531645569620253) internal successors, (99), 79 states have internal predecessors, (99), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 11:49:53,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 104 transitions. [2021-05-02 11:49:53,150 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 104 transitions. Word has length 65 [2021-05-02 11:49:53,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:49:53,150 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 104 transitions. [2021-05-02 11:49:53,151 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 4.888888888888889) internal successors, (44), 8 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:53,151 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 104 transitions. [2021-05-02 11:49:53,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-05-02 11:49:53,151 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:53,151 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:53,367 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:49:53,367 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:53,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:53,367 INFO L82 PathProgramCache]: Analyzing trace with hash 1448329309, now seen corresponding path program 5 times [2021-05-02 11:49:53,368 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:53,368 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [453077713] [2021-05-02 11:49:53,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:53,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:53,457 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:53,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:53,460 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 73 proven. 5 refuted. 0 times theorem prover too weak. 178 trivial. 0 not checked. [2021-05-02 11:49:53,460 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:53,460 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [453077713] [2021-05-02 11:49:53,460 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [453077713] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:53,460 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [283852852] [2021-05-02 11:49:53,460 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 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 11:49:55,952 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 13 check-sat command(s) [2021-05-02 11:49:55,952 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:49:55,964 INFO L263 TraceCheckSpWp]: Trace formula consists of 478 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 11:49:55,966 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:49:56,025 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:56,028 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:56,045 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:56,046 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:56,056 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:56,103 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 131 proven. 5 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-05-02 11:49:56,103 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [283852852] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:56,103 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:49:56,103 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 11 [2021-05-02 11:49:56,104 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [6645897] [2021-05-02 11:49:56,104 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 11:49:56,104 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:49:56,104 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 11:49:56,104 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-05-02 11:49:56,104 INFO L87 Difference]: Start difference. First operand 85 states and 104 transitions. Second operand has 11 states, 11 states have (on average 5.090909090909091) internal successors, (56), 10 states have internal predecessors, (56), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:56,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:49:56,178 INFO L93 Difference]: Finished difference Result 164 states and 212 transitions. [2021-05-02 11:49:56,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 11:49:56,178 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 5.090909090909091) internal successors, (56), 10 states have internal predecessors, (56), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 80 [2021-05-02 11:49:56,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:49:56,179 INFO L225 Difference]: With dead ends: 164 [2021-05-02 11:49:56,179 INFO L226 Difference]: Without dead ends: 110 [2021-05-02 11:49:56,179 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 48.2ms TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-05-02 11:49:56,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-05-02 11:49:56,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 100. [2021-05-02 11:49:56,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 94 states have (on average 1.2659574468085106) internal successors, (119), 94 states have internal predecessors, (119), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 11:49:56,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 124 transitions. [2021-05-02 11:49:56,184 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 124 transitions. Word has length 80 [2021-05-02 11:49:56,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:49:56,184 INFO L480 AbstractCegarLoop]: Abstraction has 100 states and 124 transitions. [2021-05-02 11:49:56,184 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 5.090909090909091) internal successors, (56), 10 states have internal predecessors, (56), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:56,184 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 124 transitions. [2021-05-02 11:49:56,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-05-02 11:49:56,185 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:56,185 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 15, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:56,385 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:49:56,386 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:56,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:56,386 INFO L82 PathProgramCache]: Analyzing trace with hash 1620432271, now seen corresponding path program 6 times [2021-05-02 11:49:56,386 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:56,386 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [814799541] [2021-05-02 11:49:56,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:56,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:56,485 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:56,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:56,488 INFO L134 CoverageAnalysis]: Checked inductivity of 461 backedges. 141 proven. 12 refuted. 0 times theorem prover too weak. 308 trivial. 0 not checked. [2021-05-02 11:49:56,489 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:56,489 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [814799541] [2021-05-02 11:49:56,489 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [814799541] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:56,489 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [388072652] [2021-05-02 11:49:56,489 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 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 11:49:56,560 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-02 11:49:56,560 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:49:56,562 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 11:49:56,564 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:49:56,666 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:56,667 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:56,677 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:56,682 INFO L134 CoverageAnalysis]: Checked inductivity of 461 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 460 trivial. 0 not checked. [2021-05-02 11:49:56,683 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [388072652] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:56,683 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:49:56,683 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 5] total 11 [2021-05-02 11:49:56,683 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [825740797] [2021-05-02 11:49:56,683 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 11:49:56,683 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:49:56,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 11:49:56,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=73, Unknown=0, NotChecked=0, Total=110 [2021-05-02 11:49:56,684 INFO L87 Difference]: Start difference. First operand 100 states and 124 transitions. Second operand has 11 states, 11 states have (on average 5.181818181818182) internal successors, (57), 10 states have internal predecessors, (57), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:56,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:49:56,919 INFO L93 Difference]: Finished difference Result 204 states and 264 transitions. [2021-05-02 11:49:56,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 11:49:56,919 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 5.181818181818182) internal successors, (57), 10 states have internal predecessors, (57), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 95 [2021-05-02 11:49:56,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:49:56,920 INFO L225 Difference]: With dead ends: 204 [2021-05-02 11:49:56,920 INFO L226 Difference]: Without dead ends: 138 [2021-05-02 11:49:56,921 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 160.5ms TimeCoverageRelationStatistics Valid=147, Invalid=273, Unknown=0, NotChecked=0, Total=420 [2021-05-02 11:49:56,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2021-05-02 11:49:56,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 118. [2021-05-02 11:49:56,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 112 states have (on average 1.2678571428571428) internal successors, (142), 112 states have internal predecessors, (142), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 11:49:56,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 147 transitions. [2021-05-02 11:49:56,926 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 147 transitions. Word has length 95 [2021-05-02 11:49:56,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:49:56,926 INFO L480 AbstractCegarLoop]: Abstraction has 118 states and 147 transitions. [2021-05-02 11:49:56,926 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 5.181818181818182) internal successors, (57), 10 states have internal predecessors, (57), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:56,926 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 147 transitions. [2021-05-02 11:49:56,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-05-02 11:49:56,927 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:56,927 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 20, 5, 5, 5, 5, 5, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:57,129 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 11:49:57,130 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:57,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:57,130 INFO L82 PathProgramCache]: Analyzing trace with hash -37206732, now seen corresponding path program 7 times [2021-05-02 11:49:57,130 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:57,130 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [433520899] [2021-05-02 11:49:57,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:57,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:57,212 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:57,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:57,215 INFO L134 CoverageAnalysis]: Checked inductivity of 745 backedges. 233 proven. 22 refuted. 0 times theorem prover too weak. 490 trivial. 0 not checked. [2021-05-02 11:49:57,215 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:57,215 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [433520899] [2021-05-02 11:49:57,215 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [433520899] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:57,215 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1970944586] [2021-05-02 11:49:57,215 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 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 11:49:57,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:57,328 INFO L263 TraceCheckSpWp]: Trace formula consists of 642 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 11:49:57,330 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:49:57,364 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,366 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,401 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,404 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,418 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,420 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,437 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,438 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,452 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,508 INFO L134 CoverageAnalysis]: Checked inductivity of 745 backedges. 233 proven. 22 refuted. 0 times theorem prover too weak. 490 trivial. 0 not checked. [2021-05-02 11:49:57,509 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1970944586] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:57,509 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:49:57,509 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 15 [2021-05-02 11:49:57,509 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [686282633] [2021-05-02 11:49:57,509 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 11:49:57,509 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:49:57,510 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 11:49:57,510 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=132, Unknown=0, NotChecked=0, Total=210 [2021-05-02 11:49:57,510 INFO L87 Difference]: Start difference. First operand 118 states and 147 transitions. Second operand has 15 states, 15 states have (on average 4.133333333333334) internal successors, (62), 14 states have internal predecessors, (62), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:57,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:49:57,600 INFO L93 Difference]: Finished difference Result 224 states and 290 transitions. [2021-05-02 11:49:57,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 11:49:57,600 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 4.133333333333334) internal successors, (62), 14 states have internal predecessors, (62), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 113 [2021-05-02 11:49:57,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:49:57,601 INFO L225 Difference]: With dead ends: 224 [2021-05-02 11:49:57,601 INFO L226 Difference]: Without dead ends: 143 [2021-05-02 11:49:57,601 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 110 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 97.7ms TimeCoverageRelationStatistics Valid=78, Invalid=132, Unknown=0, NotChecked=0, Total=210 [2021-05-02 11:49:57,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2021-05-02 11:49:57,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 133. [2021-05-02 11:49:57,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 127 states have (on average 1.2755905511811023) internal successors, (162), 127 states have internal predecessors, (162), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 11:49:57,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 167 transitions. [2021-05-02 11:49:57,606 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 167 transitions. Word has length 113 [2021-05-02 11:49:57,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:49:57,606 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 167 transitions. [2021-05-02 11:49:57,606 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 4.133333333333334) internal successors, (62), 14 states have internal predecessors, (62), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:57,607 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 167 transitions. [2021-05-02 11:49:57,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2021-05-02 11:49:57,607 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:57,607 INFO L523 BasicCegarLoop]: trace histogram [25, 25, 25, 5, 5, 5, 5, 5, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:57,820 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:49:57,821 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:57,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:57,821 INFO L82 PathProgramCache]: Analyzing trace with hash -489067198, now seen corresponding path program 8 times [2021-05-02 11:49:57,821 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:57,821 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1826513817] [2021-05-02 11:49:57,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:57,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:57,935 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:57,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:57,938 INFO L134 CoverageAnalysis]: Checked inductivity of 1100 backedges. 349 proven. 35 refuted. 0 times theorem prover too weak. 716 trivial. 0 not checked. [2021-05-02 11:49:57,938 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:57,938 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1826513817] [2021-05-02 11:49:57,938 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1826513817] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:57,938 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1627406563] [2021-05-02 11:49:57,938 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 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 11:49:58,050 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 11:49:58,051 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:49:58,052 INFO L263 TraceCheckSpWp]: Trace formula consists of 717 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-02 11:49:58,054 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:49:58,090 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:58,091 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:58,115 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:58,116 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:58,128 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:58,129 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:58,141 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:58,142 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:58,157 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:58,158 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:58,171 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:58,229 INFO L134 CoverageAnalysis]: Checked inductivity of 1100 backedges. 349 proven. 35 refuted. 0 times theorem prover too weak. 716 trivial. 0 not checked. [2021-05-02 11:49:58,230 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1627406563] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:58,230 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:49:58,230 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 17 [2021-05-02 11:49:58,230 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1440365150] [2021-05-02 11:49:58,230 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 11:49:58,230 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:49:58,230 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 11:49:58,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=171, Unknown=0, NotChecked=0, Total=272 [2021-05-02 11:49:58,231 INFO L87 Difference]: Start difference. First operand 133 states and 167 transitions. Second operand has 17 states, 17 states have (on average 4.0) internal successors, (68), 16 states have internal predecessors, (68), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:58,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:49:58,303 INFO L93 Difference]: Finished difference Result 251 states and 326 transitions. [2021-05-02 11:49:58,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 11:49:58,303 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 4.0) internal successors, (68), 16 states have internal predecessors, (68), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 128 [2021-05-02 11:49:58,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:49:58,304 INFO L225 Difference]: With dead ends: 251 [2021-05-02 11:49:58,304 INFO L226 Difference]: Without dead ends: 158 [2021-05-02 11:49:58,305 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 99.4ms TimeCoverageRelationStatistics Valid=101, Invalid=171, Unknown=0, NotChecked=0, Total=272 [2021-05-02 11:49:58,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2021-05-02 11:49:58,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 148. [2021-05-02 11:49:58,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 142 states have (on average 1.2816901408450705) internal successors, (182), 142 states have internal predecessors, (182), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 11:49:58,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 187 transitions. [2021-05-02 11:49:58,311 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 187 transitions. Word has length 128 [2021-05-02 11:49:58,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:49:58,311 INFO L480 AbstractCegarLoop]: Abstraction has 148 states and 187 transitions. [2021-05-02 11:49:58,313 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 4.0) internal successors, (68), 16 states have internal predecessors, (68), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:58,313 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 187 transitions. [2021-05-02 11:49:58,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-05-02 11:49:58,313 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:58,313 INFO L523 BasicCegarLoop]: trace histogram [30, 30, 30, 5, 5, 5, 5, 5, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:58,529 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 11:49:58,529 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:58,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:58,529 INFO L82 PathProgramCache]: Analyzing trace with hash -784627596, now seen corresponding path program 9 times [2021-05-02 11:49:58,529 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:58,530 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1578400306] [2021-05-02 11:49:58,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:58,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:58,645 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:58,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:58,648 INFO L134 CoverageAnalysis]: Checked inductivity of 1530 backedges. 489 proven. 51 refuted. 0 times theorem prover too weak. 990 trivial. 0 not checked. [2021-05-02 11:49:58,648 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:58,648 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1578400306] [2021-05-02 11:49:58,648 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1578400306] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:58,648 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1976307776] [2021-05-02 11:49:58,648 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 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 11:49:58,729 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 11:49:58,729 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:49:58,730 INFO L263 TraceCheckSpWp]: Trace formula consists of 318 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 11:49:58,732 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:49:58,873 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:58,874 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:58,884 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:58,885 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:58,894 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:58,900 INFO L134 CoverageAnalysis]: Checked inductivity of 1530 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1525 trivial. 0 not checked. [2021-05-02 11:49:58,900 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1976307776] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:58,900 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:49:58,900 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 6] total 15 [2021-05-02 11:49:58,900 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [512304067] [2021-05-02 11:49:58,900 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 11:49:58,900 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:49:58,901 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 11:49:58,901 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=141, Unknown=0, NotChecked=0, Total=210 [2021-05-02 11:49:58,901 INFO L87 Difference]: Start difference. First operand 148 states and 187 transitions. Second operand has 15 states, 15 states have (on average 4.6) internal successors, (69), 14 states have internal predecessors, (69), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:59,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:49:59,428 INFO L93 Difference]: Finished difference Result 295 states and 383 transitions. [2021-05-02 11:49:59,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 11:49:59,429 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 4.6) internal successors, (69), 14 states have internal predecessors, (69), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 143 [2021-05-02 11:49:59,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:49:59,429 INFO L225 Difference]: With dead ends: 295 [2021-05-02 11:49:59,429 INFO L226 Difference]: Without dead ends: 190 [2021-05-02 11:49:59,430 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 324 ImplicationChecksByTransitivity, 395.0ms TimeCoverageRelationStatistics Valid=489, Invalid=993, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 11:49:59,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2021-05-02 11:49:59,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 166. [2021-05-02 11:49:59,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 160 states have (on average 1.28125) internal successors, (205), 160 states have internal predecessors, (205), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 11:49:59,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 210 transitions. [2021-05-02 11:49:59,437 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 210 transitions. Word has length 143 [2021-05-02 11:49:59,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:49:59,437 INFO L480 AbstractCegarLoop]: Abstraction has 166 states and 210 transitions. [2021-05-02 11:49:59,437 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 4.6) internal successors, (69), 14 states have internal predecessors, (69), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:59,438 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 210 transitions. [2021-05-02 11:49:59,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2021-05-02 11:49:59,438 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:59,438 INFO L523 BasicCegarLoop]: trace histogram [35, 35, 35, 5, 5, 5, 5, 5, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:59,656 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-02 11:49:59,656 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:59,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:59,657 INFO L82 PathProgramCache]: Analyzing trace with hash 221913391, now seen corresponding path program 10 times [2021-05-02 11:49:59,657 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:59,657 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [973062786] [2021-05-02 11:49:59,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:59,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:59,805 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:59,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:59,808 INFO L134 CoverageAnalysis]: Checked inductivity of 2042 backedges. 653 proven. 70 refuted. 0 times theorem prover too weak. 1319 trivial. 0 not checked. [2021-05-02 11:49:59,808 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:59,808 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [973062786] [2021-05-02 11:49:59,808 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [973062786] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:59,808 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1743415919] [2021-05-02 11:49:59,808 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 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 11:49:59,938 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 11:49:59,938 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:49:59,940 INFO L263 TraceCheckSpWp]: Trace formula consists of 696 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 11:49:59,942 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:49:59,970 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:59,976 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:59,984 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:59,985 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:59,992 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:59,994 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,002 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,003 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,014 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,020 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,031 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,032 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,055 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,161 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,162 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,173 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,174 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,186 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,187 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,197 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,202 INFO L134 CoverageAnalysis]: Checked inductivity of 2042 backedges. 56 proven. 591 refuted. 0 times theorem prover too weak. 1395 trivial. 0 not checked. [2021-05-02 11:50:00,203 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1743415919] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:50:00,203 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:50:00,203 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 14] total 24 [2021-05-02 11:50:00,203 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [707987197] [2021-05-02 11:50:00,203 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 11:50:00,203 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:50:00,204 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 11:50:00,204 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=430, Unknown=0, NotChecked=0, Total=552 [2021-05-02 11:50:00,204 INFO L87 Difference]: Start difference. First operand 166 states and 210 transitions. Second operand has 24 states, 24 states have (on average 3.9583333333333335) internal successors, (95), 23 states have internal predecessors, (95), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:50:01,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:50:01,257 INFO L93 Difference]: Finished difference Result 332 states and 430 transitions. [2021-05-02 11:50:01,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-05-02 11:50:01,258 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 3.9583333333333335) internal successors, (95), 23 states have internal predecessors, (95), 2 states have call successors, (4), 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 161 [2021-05-02 11:50:01,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:50:01,259 INFO L225 Difference]: With dead ends: 332 [2021-05-02 11:50:01,259 INFO L226 Difference]: Without dead ends: 212 [2021-05-02 11:50:01,260 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 152 SyntacticMatches, 0 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1429 ImplicationChecksByTransitivity, 721.3ms TimeCoverageRelationStatistics Valid=1022, Invalid=4090, Unknown=0, NotChecked=0, Total=5112 [2021-05-02 11:50:01,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2021-05-02 11:50:01,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 184. [2021-05-02 11:50:01,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 184 states, 178 states have (on average 1.2808988764044944) internal successors, (228), 178 states have internal predecessors, (228), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 11:50:01,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 233 transitions. [2021-05-02 11:50:01,272 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 233 transitions. Word has length 161 [2021-05-02 11:50:01,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:50:01,272 INFO L480 AbstractCegarLoop]: Abstraction has 184 states and 233 transitions. [2021-05-02 11:50:01,272 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 3.9583333333333335) internal successors, (95), 23 states have internal predecessors, (95), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:50:01,272 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 233 transitions. [2021-05-02 11:50:01,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2021-05-02 11:50:01,274 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:50:01,274 INFO L523 BasicCegarLoop]: trace histogram [40, 40, 40, 5, 5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:50:01,488 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 11:50:01,489 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:50:01,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:50:01,489 INFO L82 PathProgramCache]: Analyzing trace with hash 70943508, now seen corresponding path program 11 times [2021-05-02 11:50:01,489 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:50:01,489 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [162018848] [2021-05-02 11:50:01,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:50:01,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:50:01,664 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:50:01,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:50:01,668 INFO L134 CoverageAnalysis]: Checked inductivity of 2632 backedges. 841 proven. 92 refuted. 0 times theorem prover too weak. 1699 trivial. 0 not checked. [2021-05-02 11:50:01,668 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:50:01,668 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [162018848] [2021-05-02 11:50:01,668 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [162018848] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:50:01,668 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1265159960] [2021-05-02 11:50:01,668 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 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