/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/Mono6_1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 12:49:54,092 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 12:49:54,094 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 12:49:54,125 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 12:49:54,140 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 12:49:54,142 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 12:49:54,143 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 12:49:54,144 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 12:49:54,146 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 12:49:54,146 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 12:49:54,148 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 12:49:54,152 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 12:49:54,153 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 12:49:54,153 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 12:49:54,155 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 12:49:54,157 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 12:49:54,162 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 12:49:54,168 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 12:49:54,168 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 12:49:54,169 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 12:49:54,169 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2021-05-02 12:49:54,197 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 12:49:54,197 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 12:49:54,199 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 12:49:54,199 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 12:49:54,200 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 12:49:54,200 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 12:49:54,200 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 12:49:54,200 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 12:49:54,200 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 12:49:54,200 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 12:49:54,201 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 12:49:54,201 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 12:49:54,201 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 12:49:54,201 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 12:49:54,201 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 12:49:54,202 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 12:49:54,202 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 12:49:54,202 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 12:49:54,202 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 12:49:54,202 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 12:49:54,202 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 12:49:54,203 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 12:49:54,203 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 12:49:54,203 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 12:49:54,203 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 12:49:54,203 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 12:49:54,203 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 12:49:54,203 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 12:49:54,203 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 12:49:54,494 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 12:49:54,513 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 12:49:54,515 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 12:49:54,516 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 12:49:54,517 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 12:49:54,517 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/Mono6_1.c [2021-05-02 12:49:54,559 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e795323e8/454fec72dd294daf897c9e1b42eb47f8/FLAG9b33f139b [2021-05-02 12:49:54,919 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 12:49:54,920 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/Mono6_1.c [2021-05-02 12:49:54,924 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e795323e8/454fec72dd294daf897c9e1b42eb47f8/FLAG9b33f139b [2021-05-02 12:49:54,935 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e795323e8/454fec72dd294daf897c9e1b42eb47f8 [2021-05-02 12:49:54,937 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 12:49:54,939 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 12:49:54,942 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 12:49:54,942 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 12:49:54,944 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 12:49:54,945 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 12:49:54" (1/1) ... [2021-05-02 12:49:54,945 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3a9af2b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:49:54, skipping insertion in model container [2021-05-02 12:49:54,946 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 12:49:54" (1/1) ... [2021-05-02 12:49:54,950 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 12:49:54,959 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 12:49:55,074 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/Mono6_1.c[311,324] [2021-05-02 12:49:55,084 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 12:49:55,090 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 12:49:55,137 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/Mono6_1.c[311,324] [2021-05-02 12:49:55,140 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 12:49:55,150 INFO L208 MainTranslator]: Completed translation [2021-05-02 12:49:55,150 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:49:55 WrapperNode [2021-05-02 12:49:55,150 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 12:49:55,151 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 12:49:55,151 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 12:49:55,164 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 12:49:55,171 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:49:55" (1/1) ... [2021-05-02 12:49:55,172 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:49:55" (1/1) ... [2021-05-02 12:49:55,192 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:49:55" (1/1) ... [2021-05-02 12:49:55,192 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:49:55" (1/1) ... [2021-05-02 12:49:55,198 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:49:55" (1/1) ... [2021-05-02 12:49:55,202 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:49:55" (1/1) ... [2021-05-02 12:49:55,204 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:49:55" (1/1) ... [2021-05-02 12:49:55,207 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 12:49:55,207 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 12:49:55,207 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 12:49:55,207 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 12:49:55,208 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:49:55" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 12:49:55,334 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 12:49:55,335 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 12:49:55,348 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 12:49:55,349 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 12:49:55,349 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 12:49:55,349 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 12:49:55,349 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 12:49:55,349 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 12:49:55,349 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 12:49:55,350 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 12:49:55,350 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 12:49:55,350 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 12:49:55,350 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 12:49:55,350 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 12:49:55,351 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 12:49:55,351 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 12:49:55,351 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 12:49:55,663 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 12:49:55,663 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 12:49:55,664 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 12:49:55 BoogieIcfgContainer [2021-05-02 12:49:55,664 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 12:49:55,665 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 12:49:55,665 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 12:49:55,667 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 12:49:55,667 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 12:49:54" (1/3) ... [2021-05-02 12:49:55,667 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@65d4955b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 12:49:55, skipping insertion in model container [2021-05-02 12:49:55,667 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:49:55" (2/3) ... [2021-05-02 12:49:55,668 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@65d4955b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 12:49:55, skipping insertion in model container [2021-05-02 12:49:55,668 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 12:49:55" (3/3) ... [2021-05-02 12:49:55,697 INFO L111 eAbstractionObserver]: Analyzing ICFG Mono6_1.c [2021-05-02 12:49:55,701 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 12:49:55,703 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 12:49:55,739 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 12:49:55,780 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 12:49:55,780 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 12:49:55,780 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 12:49:55,780 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 12:49:55,780 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 12:49:55,780 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 12:49:55,780 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 12:49:55,780 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 12:49:55,810 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 12:49:55,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 12:49:55,813 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:49:55,814 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:49:55,814 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:49:55,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:49:55,825 INFO L82 PathProgramCache]: Analyzing trace with hash -2135496849, now seen corresponding path program 1 times [2021-05-02 12:49:55,830 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:49:55,844 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1852464772] [2021-05-02 12:49:55,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:49:55,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:56,161 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:49:56,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:56,187 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:49:56,188 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:49:56,188 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1852464772] [2021-05-02 12:49:56,189 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1852464772] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 12:49:56,189 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 12:49:56,189 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 12:49:56,197 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [995619057] [2021-05-02 12:49:56,201 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 12:49:56,201 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:49:56,210 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 12:49:56,224 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 12:49:56,227 INFO L87 Difference]: Start difference. First operand has 21 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:56,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:49:56,301 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2021-05-02 12:49:56,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 12:49:56,302 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 12:49:56,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:49:56,306 INFO L225 Difference]: With dead ends: 33 [2021-05-02 12:49:56,310 INFO L226 Difference]: Without dead ends: 14 [2021-05-02 12:49:56,326 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 98.5ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 12:49:56,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-05-02 12:49:56,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-05-02 12:49:56,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:56,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2021-05-02 12:49:56,367 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 11 [2021-05-02 12:49:56,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:49:56,367 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2021-05-02 12:49:56,367 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:56,368 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2021-05-02 12:49:56,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 12:49:56,368 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:49:56,368 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:49:56,369 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 12:49:56,369 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:49:56,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:49:56,369 INFO L82 PathProgramCache]: Analyzing trace with hash -2145655580, now seen corresponding path program 1 times [2021-05-02 12:49:56,370 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:49:56,370 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [557779847] [2021-05-02 12:49:56,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:49:56,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:56,624 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:49:56,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:56,658 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:49:56,658 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:49:56,658 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [557779847] [2021-05-02 12:49:56,659 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [557779847] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 12:49:56,659 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 12:49:56,660 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 12:49:56,660 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1098098360] [2021-05-02 12:49:56,661 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 12:49:56,661 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:49:56,662 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 12:49:56,662 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 12:49:56,662 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:56,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:49:56,786 INFO L93 Difference]: Finished difference Result 25 states and 29 transitions. [2021-05-02 12:49:56,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 12:49:56,786 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 12:49:56,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:49:56,787 INFO L225 Difference]: With dead ends: 25 [2021-05-02 12:49:56,787 INFO L226 Difference]: Without dead ends: 17 [2021-05-02 12:49:56,788 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 165.1ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 12:49:56,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-02 12:49:56,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 16. [2021-05-02 12:49:56,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:56,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2021-05-02 12:49:56,792 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 11 [2021-05-02 12:49:56,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:49:56,792 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2021-05-02 12:49:56,792 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:56,792 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2021-05-02 12:49:56,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 12:49:56,792 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:49:56,793 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:49:56,793 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 12:49:56,793 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:49:56,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:49:56,793 INFO L82 PathProgramCache]: Analyzing trace with hash -79339060, now seen corresponding path program 1 times [2021-05-02 12:49:56,793 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:49:56,794 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [882576968] [2021-05-02 12:49:56,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:49:56,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:57,016 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:49:57,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:57,045 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:49:57,046 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:49:57,046 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [882576968] [2021-05-02 12:49:57,046 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [882576968] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:57,049 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1757827137] [2021-05-02 12:49:57,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:49:57,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:57,090 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-02 12:49:57,094 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:49:57,141 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:49:57,173 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:49:57,176 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:49:57,185 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:49:57,212 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 12:49:57,213 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1757827137] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 12:49:57,213 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 12:49:57,213 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5] total 9 [2021-05-02 12:49:57,213 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2083687178] [2021-05-02 12:49:57,213 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 12:49:57,214 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:49:57,214 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 12:49:57,214 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-05-02 12:49:57,215 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 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 12:49:57,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:49:57,257 INFO L93 Difference]: Finished difference Result 24 states and 26 transitions. [2021-05-02 12:49:57,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 12:49:57,257 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 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 14 [2021-05-02 12:49:57,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:49:57,258 INFO L225 Difference]: With dead ends: 24 [2021-05-02 12:49:57,258 INFO L226 Difference]: Without dead ends: 19 [2021-05-02 12:49:57,258 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 138.8ms TimeCoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2021-05-02 12:49:57,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-05-02 12:49:57,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-05-02 12:49:57,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:57,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2021-05-02 12:49:57,262 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 14 [2021-05-02 12:49:57,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:49:57,262 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2021-05-02 12:49:57,262 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 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 12:49:57,262 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2021-05-02 12:49:57,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 12:49:57,263 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:49:57,263 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:49:57,484 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 12:49:57,485 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:49:57,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:49:57,485 INFO L82 PathProgramCache]: Analyzing trace with hash 309814626, now seen corresponding path program 1 times [2021-05-02 12:49:57,486 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:49:57,486 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [153785190] [2021-05-02 12:49:57,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:49:57,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:57,546 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:49:57,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:57,553 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:49:57,554 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:49:57,554 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [153785190] [2021-05-02 12:49:57,554 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [153785190] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:57,554 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [380477915] [2021-05-02 12:49:57,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:49:57,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:57,622 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 12:49:57,623 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:49:57,680 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:49:57,681 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [380477915] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:57,681 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:49:57,681 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-02 12:49:57,681 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1437742380] [2021-05-02 12:49:57,682 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 12:49:57,682 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:49:57,682 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 12:49:57,682 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 12:49:57,682 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:57,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:49:57,774 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2021-05-02 12:49:57,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 12:49:57,774 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-02 12:49:57,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:49:57,775 INFO L225 Difference]: With dead ends: 31 [2021-05-02 12:49:57,775 INFO L226 Difference]: Without dead ends: 23 [2021-05-02 12:49:57,775 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 74.2ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-02 12:49:57,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-02 12:49:57,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2021-05-02 12:49:57,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 17 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:57,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2021-05-02 12:49:57,779 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 17 [2021-05-02 12:49:57,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:49:57,779 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2021-05-02 12:49:57,779 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:57,780 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2021-05-02 12:49:57,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 12:49:57,780 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:49:57,780 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:49:57,997 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:49:57,998 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:49:57,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:49:57,998 INFO L82 PathProgramCache]: Analyzing trace with hash 1077515338, now seen corresponding path program 2 times [2021-05-02 12:49:57,998 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:49:57,999 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2034051256] [2021-05-02 12:49:57,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:49:58,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:58,075 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:49:58,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:58,081 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:49:58,081 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:49:58,081 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2034051256] [2021-05-02 12:49:58,081 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2034051256] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:58,081 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [313231004] [2021-05-02 12:49:58,081 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 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:49:58,118 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:49:58,118 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:49:58,119 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 12:49:58,120 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:49:58,158 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:49:58,167 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:49:58,168 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [313231004] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:58,168 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:49:58,168 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 12:49:58,168 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1954990784] [2021-05-02 12:49:58,168 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 12:49:58,168 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:49:58,169 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 12:49:58,169 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-02 12:49:58,169 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:58,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:49:58,276 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2021-05-02 12:49:58,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 12:49:58,277 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2021-05-02 12:49:58,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:49:58,277 INFO L225 Difference]: With dead ends: 34 [2021-05-02 12:49:58,277 INFO L226 Difference]: Without dead ends: 26 [2021-05-02 12:49:58,278 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 105.6ms TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-05-02 12:49:58,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-05-02 12:49:58,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2021-05-02 12:49:58,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.15) internal successors, (23), 20 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:58,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2021-05-02 12:49:58,282 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 20 [2021-05-02 12:49:58,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:49:58,282 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2021-05-02 12:49:58,282 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:58,282 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2021-05-02 12:49:58,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 12:49:58,282 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:49:58,282 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:49:58,500 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:49:58,500 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:49:58,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:49:58,501 INFO L82 PathProgramCache]: Analyzing trace with hash 948575330, now seen corresponding path program 3 times [2021-05-02 12:49:58,501 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:49:58,501 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1666018711] [2021-05-02 12:49:58,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:49:58,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:58,572 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:49:58,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:58,577 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 7 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:49:58,577 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:49:58,577 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1666018711] [2021-05-02 12:49:58,577 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1666018711] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:58,577 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1744748552] [2021-05-02 12:49:58,577 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:49:58,620 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 12:49:58,621 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:49:58,621 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 12:49:58,623 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:49:58,686 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:49:58,688 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:49:58,692 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:49:58,717 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 12:49:58,717 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1744748552] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:58,717 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:49:58,717 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2021-05-02 12:49:58,718 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [602259431] [2021-05-02 12:49:58,718 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 12:49:58,718 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:49:58,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 12:49:58,718 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2021-05-02 12:49:58,719 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand has 12 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 10 states have internal predecessors, (29), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:59,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:49:59,078 INFO L93 Difference]: Finished difference Result 43 states and 49 transitions. [2021-05-02 12:49:59,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 12:49:59,079 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 10 states have internal predecessors, (29), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2021-05-02 12:49:59,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:49:59,079 INFO L225 Difference]: With dead ends: 43 [2021-05-02 12:49:59,079 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 12:49:59,080 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 330.2ms TimeCoverageRelationStatistics Valid=78, Invalid=342, Unknown=0, NotChecked=0, Total=420 [2021-05-02 12:49:59,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 12:49:59,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2021-05-02 12:49:59,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.1538461538461537) internal successors, (30), 26 states have internal predecessors, (30), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:59,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 34 transitions. [2021-05-02 12:49:59,084 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 34 transitions. Word has length 23 [2021-05-02 12:49:59,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:49:59,084 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 34 transitions. [2021-05-02 12:49:59,084 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 10 states have internal predecessors, (29), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:59,084 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 34 transitions. [2021-05-02 12:49:59,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 12:49:59,085 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:49:59,085 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:49:59,285 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:49:59,286 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:49:59,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:49:59,286 INFO L82 PathProgramCache]: Analyzing trace with hash -1260080860, now seen corresponding path program 4 times [2021-05-02 12:49:59,287 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:49:59,287 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1800878226] [2021-05-02 12:49:59,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:49:59,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:59,384 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:49:59,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:59,388 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 23 proven. 26 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 12:49:59,388 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:49:59,389 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1800878226] [2021-05-02 12:49:59,389 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1800878226] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:59,389 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [293095078] [2021-05-02 12:49:59,389 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 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:49:59,455 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:49:59,455 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:49:59,456 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 12:49:59,457 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:49:59,504 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:49:59,514 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 23 proven. 26 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 12:49:59,515 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [293095078] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:59,515 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:49:59,515 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-02 12:49:59,515 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1836185443] [2021-05-02 12:49:59,515 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 12:49:59,515 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:49:59,516 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 12:49:59,516 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-05-02 12:49:59,516 INFO L87 Difference]: Start difference. First operand 31 states and 34 transitions. Second operand has 9 states, 9 states have (on average 3.111111111111111) internal successors, (28), 8 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:59,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:49:59,676 INFO L93 Difference]: Finished difference Result 46 states and 52 transitions. [2021-05-02 12:49:59,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 12:49:59,677 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.111111111111111) internal successors, (28), 8 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2021-05-02 12:49:59,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:49:59,677 INFO L225 Difference]: With dead ends: 46 [2021-05-02 12:49:59,677 INFO L226 Difference]: Without dead ends: 35 [2021-05-02 12:49:59,677 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 172.0ms TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2021-05-02 12:49:59,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-02 12:49:59,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2021-05-02 12:49:59,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.1379310344827587) internal successors, (33), 29 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:59,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 37 transitions. [2021-05-02 12:49:59,681 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 37 transitions. Word has length 29 [2021-05-02 12:49:59,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:49:59,681 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 37 transitions. [2021-05-02 12:49:59,681 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.111111111111111) internal successors, (28), 8 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:49:59,681 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 37 transitions. [2021-05-02 12:49:59,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 12:49:59,682 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:49:59,682 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:49:59,896 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:49:59,897 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:49:59,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:49:59,897 INFO L82 PathProgramCache]: Analyzing trace with hash 26199052, now seen corresponding path program 5 times [2021-05-02 12:49:59,897 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:49:59,897 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1147665683] [2021-05-02 12:49:59,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:49:59,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:59,982 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:49:59,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:49:59,992 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 28 proven. 40 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 12:49:59,992 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:49:59,992 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1147665683] [2021-05-02 12:49:59,993 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1147665683] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:49:59,993 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1290498249] [2021-05-02 12:49:59,993 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 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:50:00,108 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2021-05-02 12:50:00,108 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:50:00,109 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 12:50:00,110 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:50:00,224 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:00,234 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 13 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:50:00,234 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1290498249] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:00,234 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:50:00,234 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 11 [2021-05-02 12:50:00,235 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [142833616] [2021-05-02 12:50:00,235 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 12:50:00,235 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:50:00,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 12:50:00,236 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-02 12:50:00,236 INFO L87 Difference]: Start difference. First operand 34 states and 37 transitions. Second operand has 11 states, 11 states have (on average 3.090909090909091) internal successors, (34), 10 states have internal predecessors, (34), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:00,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:50:00,490 INFO L93 Difference]: Finished difference Result 52 states and 59 transitions. [2021-05-02 12:50:00,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 12:50:00,490 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.090909090909091) internal successors, (34), 10 states have internal predecessors, (34), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2021-05-02 12:50:00,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:50:00,490 INFO L225 Difference]: With dead ends: 52 [2021-05-02 12:50:00,491 INFO L226 Difference]: Without dead ends: 41 [2021-05-02 12:50:00,491 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 28 SyntacticMatches, 6 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 240.0ms TimeCoverageRelationStatistics Valid=59, Invalid=247, Unknown=0, NotChecked=0, Total=306 [2021-05-02 12:50:00,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-05-02 12:50:00,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 40. [2021-05-02 12:50:00,494 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 35 states have (on average 1.1142857142857143) internal successors, (39), 35 states have internal predecessors, (39), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:00,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2021-05-02 12:50:00,495 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 32 [2021-05-02 12:50:00,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:50:00,495 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2021-05-02 12:50:00,495 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.090909090909091) internal successors, (34), 10 states have internal predecessors, (34), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:00,495 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2021-05-02 12:50:00,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 12:50:00,495 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:50:00,496 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:50:00,700 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:50:00,700 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:50:00,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:50:00,701 INFO L82 PathProgramCache]: Analyzing trace with hash -86495988, now seen corresponding path program 6 times [2021-05-02 12:50:00,701 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:50:00,701 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1207228481] [2021-05-02 12:50:00,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:50:00,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:00,808 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:50:00,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:00,812 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 38 proven. 77 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 12:50:00,812 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:50:00,812 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1207228481] [2021-05-02 12:50:00,812 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1207228481] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:00,813 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [799225073] [2021-05-02 12:50:00,813 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 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:50:00,928 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-05-02 12:50:00,928 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:50:00,929 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 12:50:00,930 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:50:00,958 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:00,968 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:00,979 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:01,041 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:01,043 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:01,046 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:01,074 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 12:50:01,074 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [799225073] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:01,074 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:50:01,074 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8] total 17 [2021-05-02 12:50:01,076 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [293908285] [2021-05-02 12:50:01,076 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 12:50:01,076 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:50:01,076 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 12:50:01,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=234, Unknown=0, NotChecked=0, Total=272 [2021-05-02 12:50:01,077 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand has 17 states, 16 states have (on average 2.875) internal successors, (46), 15 states have internal predecessors, (46), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:01,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:50:01,732 INFO L93 Difference]: Finished difference Result 61 states and 69 transitions. [2021-05-02 12:50:01,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 12:50:01,733 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.875) internal successors, (46), 15 states have internal predecessors, (46), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2021-05-02 12:50:01,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:50:01,735 INFO L225 Difference]: With dead ends: 61 [2021-05-02 12:50:01,735 INFO L226 Difference]: Without dead ends: 47 [2021-05-02 12:50:01,736 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 544.9ms TimeCoverageRelationStatistics Valid=128, Invalid=802, Unknown=0, NotChecked=0, Total=930 [2021-05-02 12:50:01,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-05-02 12:50:01,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 46. [2021-05-02 12:50:01,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.1219512195121952) internal successors, (46), 41 states have internal predecessors, (46), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:01,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2021-05-02 12:50:01,754 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 38 [2021-05-02 12:50:01,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:50:01,754 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2021-05-02 12:50:01,754 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 16 states have (on average 2.875) internal successors, (46), 15 states have internal predecessors, (46), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:01,754 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2021-05-02 12:50:01,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-02 12:50:01,756 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:50:01,756 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 8, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:50:01,974 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:50:01,974 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:50:01,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:50:01,975 INFO L82 PathProgramCache]: Analyzing trace with hash 1869072650, now seen corresponding path program 7 times [2021-05-02 12:50:01,975 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:50:01,975 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1164907245] [2021-05-02 12:50:01,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:50:01,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:02,107 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:50:02,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:02,111 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 69 proven. 100 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 12:50:02,111 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:50:02,111 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1164907245] [2021-05-02 12:50:02,111 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1164907245] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:02,112 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1788312313] [2021-05-02 12:50:02,112 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 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:50:02,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:02,147 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 12:50:02,149 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:50:02,226 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:02,240 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 69 proven. 100 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 12:50:02,240 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1788312313] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:02,240 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:50:02,240 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2021-05-02 12:50:02,240 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1653836690] [2021-05-02 12:50:02,240 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 12:50:02,241 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:50:02,241 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 12:50:02,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-02 12:50:02,241 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand has 13 states, 13 states have (on average 3.076923076923077) internal successors, (40), 12 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:02,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:50:02,634 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2021-05-02 12:50:02,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 12:50:02,634 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.076923076923077) internal successors, (40), 12 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 44 [2021-05-02 12:50:02,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:50:02,635 INFO L225 Difference]: With dead ends: 64 [2021-05-02 12:50:02,635 INFO L226 Difference]: Without dead ends: 50 [2021-05-02 12:50:02,635 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 316.9ms TimeCoverageRelationStatistics Valid=77, Invalid=385, Unknown=0, NotChecked=0, Total=462 [2021-05-02 12:50:02,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-05-02 12:50:02,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2021-05-02 12:50:02,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 44 states have (on average 1.1136363636363635) internal successors, (49), 44 states have internal predecessors, (49), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:02,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 53 transitions. [2021-05-02 12:50:02,639 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 53 transitions. Word has length 44 [2021-05-02 12:50:02,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:50:02,639 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 53 transitions. [2021-05-02 12:50:02,639 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 3.076923076923077) internal successors, (40), 12 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:02,639 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 53 transitions. [2021-05-02 12:50:02,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 12:50:02,640 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:50:02,640 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 9, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:50:02,857 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 12:50:02,857 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:50:02,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:50:02,857 INFO L82 PathProgramCache]: Analyzing trace with hash -2061006558, now seen corresponding path program 8 times [2021-05-02 12:50:02,858 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:50:02,858 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [41132788] [2021-05-02 12:50:02,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:50:02,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:02,996 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:50:02,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:03,000 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 77 proven. 126 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 12:50:03,000 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:50:03,000 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [41132788] [2021-05-02 12:50:03,000 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [41132788] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:03,000 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [517625229] [2021-05-02 12:50:03,000 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 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:50:03,064 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:50:03,065 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:50:03,065 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 12:50:03,066 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:50:03,129 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:03,140 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 77 proven. 126 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 12:50:03,141 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [517625229] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:03,141 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:50:03,141 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2021-05-02 12:50:03,141 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [516300366] [2021-05-02 12:50:03,141 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 12:50:03,141 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:50:03,142 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 12:50:03,142 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-02 12:50:03,142 INFO L87 Difference]: Start difference. First operand 49 states and 53 transitions. Second operand has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 13 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:03,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:50:03,561 INFO L93 Difference]: Finished difference Result 67 states and 75 transitions. [2021-05-02 12:50:03,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 12:50:03,562 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 13 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 47 [2021-05-02 12:50:03,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:50:03,562 INFO L225 Difference]: With dead ends: 67 [2021-05-02 12:50:03,562 INFO L226 Difference]: Without dead ends: 53 [2021-05-02 12:50:03,563 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 328.0ms TimeCoverageRelationStatistics Valid=85, Invalid=467, Unknown=0, NotChecked=0, Total=552 [2021-05-02 12:50:03,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-02 12:50:03,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 52. [2021-05-02 12:50:03,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 47 states have (on average 1.1063829787234043) internal successors, (52), 47 states have internal predecessors, (52), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:03,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 56 transitions. [2021-05-02 12:50:03,566 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 56 transitions. Word has length 47 [2021-05-02 12:50:03,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:50:03,566 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 56 transitions. [2021-05-02 12:50:03,567 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 13 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:03,567 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 56 transitions. [2021-05-02 12:50:03,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-02 12:50:03,567 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:50:03,567 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 10, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:50:03,783 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:50:03,783 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:50:03,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:50:03,784 INFO L82 PathProgramCache]: Analyzing trace with hash 2052764170, now seen corresponding path program 9 times [2021-05-02 12:50:03,784 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:50:03,784 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [598355621] [2021-05-02 12:50:03,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:50:03,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:03,925 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:50:03,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:03,930 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 85 proven. 155 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 12:50:03,931 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:50:03,931 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [598355621] [2021-05-02 12:50:03,931 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [598355621] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:03,931 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1320088644] [2021-05-02 12:50:03,931 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 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:50:04,040 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-05-02 12:50:04,040 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:50:04,041 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 12:50:04,042 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:50:04,168 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:04,224 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:04,226 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:04,232 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:04,266 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 12:50:04,266 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1320088644] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:04,266 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:50:04,266 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 10] total 22 [2021-05-02 12:50:04,266 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [264907891] [2021-05-02 12:50:04,266 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 12:50:04,267 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:50:04,267 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 12:50:04,267 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=410, Unknown=0, NotChecked=0, Total=462 [2021-05-02 12:50:04,267 INFO L87 Difference]: Start difference. First operand 52 states and 56 transitions. Second operand has 22 states, 21 states have (on average 2.761904761904762) internal successors, (58), 20 states have internal predecessors, (58), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:05,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:50:05,291 INFO L93 Difference]: Finished difference Result 77 states and 87 transitions. [2021-05-02 12:50:05,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 12:50:05,291 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 2.761904761904762) internal successors, (58), 20 states have internal predecessors, (58), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 50 [2021-05-02 12:50:05,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:50:05,293 INFO L225 Difference]: With dead ends: 77 [2021-05-02 12:50:05,293 INFO L226 Difference]: Without dead ends: 60 [2021-05-02 12:50:05,293 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 198 ImplicationChecksByTransitivity, 821.1ms TimeCoverageRelationStatistics Valid=176, Invalid=1464, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 12:50:05,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-05-02 12:50:05,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 58. [2021-05-02 12:50:05,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 53 states have (on average 1.1132075471698113) internal successors, (59), 53 states have internal predecessors, (59), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:05,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 63 transitions. [2021-05-02 12:50:05,309 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 63 transitions. Word has length 50 [2021-05-02 12:50:05,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:50:05,309 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 63 transitions. [2021-05-02 12:50:05,309 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 21 states have (on average 2.761904761904762) internal successors, (58), 20 states have internal predecessors, (58), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:05,310 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 63 transitions. [2021-05-02 12:50:05,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-05-02 12:50:05,310 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:50:05,310 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 11, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:50:05,530 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 12:50:05,531 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:50:05,532 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:50:05,532 INFO L82 PathProgramCache]: Analyzing trace with hash -795402420, now seen corresponding path program 10 times [2021-05-02 12:50:05,532 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:50:05,532 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1415539826] [2021-05-02 12:50:05,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:50:05,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:05,717 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:50:05,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:05,720 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 128 proven. 187 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 12:50:05,720 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:50:05,720 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1415539826] [2021-05-02 12:50:05,720 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1415539826] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:05,721 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [529687499] [2021-05-02 12:50:05,721 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 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:50:05,759 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:50:05,760 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:50:05,760 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 25 conjunts are in the unsatisfiable core [2021-05-02 12:50:05,766 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:50:05,842 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:05,856 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 128 proven. 187 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 12:50:05,856 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [529687499] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:05,857 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:50:05,857 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2021-05-02 12:50:05,858 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [130373799] [2021-05-02 12:50:05,858 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 12:50:05,858 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:50:05,859 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 12:50:05,859 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-05-02 12:50:05,859 INFO L87 Difference]: Start difference. First operand 58 states and 63 transitions. Second operand has 16 states, 16 states have (on average 3.0625) internal successors, (49), 15 states have internal predecessors, (49), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:06,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:50:06,354 INFO L93 Difference]: Finished difference Result 79 states and 89 transitions. [2021-05-02 12:50:06,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 12:50:06,355 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.0625) internal successors, (49), 15 states have internal predecessors, (49), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 56 [2021-05-02 12:50:06,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:50:06,355 INFO L225 Difference]: With dead ends: 79 [2021-05-02 12:50:06,355 INFO L226 Difference]: Without dead ends: 62 [2021-05-02 12:50:06,356 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 58 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 447.8ms TimeCoverageRelationStatistics Valid=101, Invalid=655, Unknown=0, NotChecked=0, Total=756 [2021-05-02 12:50:06,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-05-02 12:50:06,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2021-05-02 12:50:06,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 56 states have (on average 1.1071428571428572) internal successors, (62), 56 states have internal predecessors, (62), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:06,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 66 transitions. [2021-05-02 12:50:06,360 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 66 transitions. Word has length 56 [2021-05-02 12:50:06,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:50:06,360 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 66 transitions. [2021-05-02 12:50:06,360 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 3.0625) internal successors, (49), 15 states have internal predecessors, (49), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:06,360 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 66 transitions. [2021-05-02 12:50:06,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 12:50:06,362 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:50:06,362 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 12, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:50:06,577 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 12:50:06,578 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:50:06,578 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:50:06,578 INFO L82 PathProgramCache]: Analyzing trace with hash -520127644, now seen corresponding path program 11 times [2021-05-02 12:50:06,579 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:50:06,579 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [348367900] [2021-05-02 12:50:06,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:50:06,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:06,796 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:50:06,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:06,802 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 139 proven. 222 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 12:50:06,802 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:50:06,802 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [348367900] [2021-05-02 12:50:06,803 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [348367900] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:06,803 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1438830201] [2021-05-02 12:50:06,803 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 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:50:07,580 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 17 check-sat command(s) [2021-05-02 12:50:07,580 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:50:07,583 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 38 conjunts are in the unsatisfiable core [2021-05-02 12:50:07,584 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:50:07,738 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:07,751 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 139 proven. 222 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 12:50:07,751 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1438830201] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:07,751 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:50:07,752 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2021-05-02 12:50:07,752 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [476163290] [2021-05-02 12:50:07,752 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 12:50:07,752 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:50:07,752 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 12:50:07,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2021-05-02 12:50:07,753 INFO L87 Difference]: Start difference. First operand 61 states and 66 transitions. Second operand has 17 states, 17 states have (on average 3.0588235294117645) internal successors, (52), 16 states have internal predecessors, (52), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:08,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:50:08,364 INFO L93 Difference]: Finished difference Result 82 states and 92 transitions. [2021-05-02 12:50:08,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 12:50:08,364 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 3.0588235294117645) internal successors, (52), 16 states have internal predecessors, (52), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 59 [2021-05-02 12:50:08,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:50:08,365 INFO L225 Difference]: With dead ends: 82 [2021-05-02 12:50:08,365 INFO L226 Difference]: Without dead ends: 65 [2021-05-02 12:50:08,366 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 51 SyntacticMatches, 11 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 550.7ms TimeCoverageRelationStatistics Valid=109, Invalid=761, Unknown=0, NotChecked=0, Total=870 [2021-05-02 12:50:08,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-02 12:50:08,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 64. [2021-05-02 12:50:08,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 59 states have (on average 1.1016949152542372) internal successors, (65), 59 states have internal predecessors, (65), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:08,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 69 transitions. [2021-05-02 12:50:08,369 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 69 transitions. Word has length 59 [2021-05-02 12:50:08,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:50:08,369 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 69 transitions. [2021-05-02 12:50:08,369 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 3.0588235294117645) internal successors, (52), 16 states have internal predecessors, (52), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:08,369 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 69 transitions. [2021-05-02 12:50:08,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-05-02 12:50:08,370 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:50:08,370 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 13, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:50:08,574 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 12:50:08,574 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:50:08,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:50:08,574 INFO L82 PathProgramCache]: Analyzing trace with hash 1098156108, now seen corresponding path program 12 times [2021-05-02 12:50:08,574 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:50:08,575 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [323241680] [2021-05-02 12:50:08,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:50:08,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:08,801 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:50:08,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:08,805 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 150 proven. 260 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 12:50:08,805 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:50:08,805 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [323241680] [2021-05-02 12:50:08,805 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [323241680] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:08,805 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1495087429] [2021-05-02 12:50:08,805 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:50:09,013 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-05-02 12:50:09,013 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:50:09,014 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 12:50:09,016 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:50:09,259 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:09,269 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:09,277 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:09,284 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:09,420 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:09,421 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:09,423 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:09,466 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 31 proven. 207 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2021-05-02 12:50:09,467 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1495087429] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:09,467 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:50:09,467 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 14] total 29 [2021-05-02 12:50:09,467 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [533323142] [2021-05-02 12:50:09,467 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-02 12:50:09,467 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:50:09,468 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-02 12:50:09,468 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=737, Unknown=0, NotChecked=0, Total=812 [2021-05-02 12:50:09,468 INFO L87 Difference]: Start difference. First operand 64 states and 69 transitions. Second operand has 29 states, 28 states have (on average 2.75) internal successors, (77), 27 states have internal predecessors, (77), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:11,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:50:11,269 INFO L93 Difference]: Finished difference Result 93 states and 106 transitions. [2021-05-02 12:50:11,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 12:50:11,269 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 2.75) internal successors, (77), 27 states have internal predecessors, (77), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 62 [2021-05-02 12:50:11,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:50:11,270 INFO L225 Difference]: With dead ends: 93 [2021-05-02 12:50:11,270 INFO L226 Difference]: Without dead ends: 73 [2021-05-02 12:50:11,271 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 324 ImplicationChecksByTransitivity, 1634.0ms TimeCoverageRelationStatistics Valid=292, Invalid=2360, Unknown=0, NotChecked=0, Total=2652 [2021-05-02 12:50:11,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2021-05-02 12:50:11,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2021-05-02 12:50:11,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 68 states have (on average 1.1029411764705883) internal successors, (75), 68 states have internal predecessors, (75), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:11,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 79 transitions. [2021-05-02 12:50:11,276 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 79 transitions. Word has length 62 [2021-05-02 12:50:11,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:50:11,276 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 79 transitions. [2021-05-02 12:50:11,276 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 28 states have (on average 2.75) internal successors, (77), 27 states have internal predecessors, (77), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:11,276 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 79 transitions. [2021-05-02 12:50:11,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-05-02 12:50:11,277 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:50:11,277 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 15, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:50:11,493 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:50:11,493 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:50:11,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:50:11,493 INFO L82 PathProgramCache]: Analyzing trace with hash -762223134, now seen corresponding path program 13 times [2021-05-02 12:50:11,493 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:50:11,494 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1857208187] [2021-05-02 12:50:11,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:50:11,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:11,741 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:50:11,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:11,745 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 219 proven. 345 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 12:50:11,746 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:50:11,746 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1857208187] [2021-05-02 12:50:11,746 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1857208187] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:11,746 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [36618305] [2021-05-02 12:50:11,746 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 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:50:11,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:11,801 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 33 conjunts are in the unsatisfiable core [2021-05-02 12:50:11,802 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:50:11,891 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:11,912 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 219 proven. 345 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 12:50:11,912 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [36618305] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:11,912 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:50:11,912 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2021-05-02 12:50:11,912 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1219929510] [2021-05-02 12:50:11,913 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 12:50:11,913 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:50:11,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 12:50:11,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2021-05-02 12:50:11,914 INFO L87 Difference]: Start difference. First operand 73 states and 79 transitions. Second operand has 20 states, 20 states have (on average 3.05) internal successors, (61), 19 states have internal predecessors, (61), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:12,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:50:12,696 INFO L93 Difference]: Finished difference Result 97 states and 109 transitions. [2021-05-02 12:50:12,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 12:50:12,697 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 3.05) internal successors, (61), 19 states have internal predecessors, (61), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 71 [2021-05-02 12:50:12,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:50:12,697 INFO L225 Difference]: With dead ends: 97 [2021-05-02 12:50:12,697 INFO L226 Difference]: Without dead ends: 77 [2021-05-02 12:50:12,698 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 73 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 610.0ms TimeCoverageRelationStatistics Valid=133, Invalid=1127, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 12:50:12,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-02 12:50:12,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 76. [2021-05-02 12:50:12,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 71 states have (on average 1.0985915492957747) internal successors, (78), 71 states have internal predecessors, (78), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:12,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 82 transitions. [2021-05-02 12:50:12,702 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 82 transitions. Word has length 71 [2021-05-02 12:50:12,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:50:12,702 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 82 transitions. [2021-05-02 12:50:12,703 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 3.05) internal successors, (61), 19 states have internal predecessors, (61), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:12,703 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 82 transitions. [2021-05-02 12:50:12,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-05-02 12:50:12,703 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:50:12,703 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 16, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:50:12,921 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:50:12,922 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:50:12,922 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:50:12,922 INFO L82 PathProgramCache]: Analyzing trace with hash 1989301962, now seen corresponding path program 14 times [2021-05-02 12:50:12,922 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:50:12,922 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1093794907] [2021-05-02 12:50:12,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:50:12,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:13,179 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:50:13,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:13,184 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 233 proven. 392 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 12:50:13,184 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:50:13,184 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1093794907] [2021-05-02 12:50:13,184 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1093794907] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:13,184 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1903054101] [2021-05-02 12:50:13,184 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 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:50:13,228 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:50:13,228 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:50:13,229 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 35 conjunts are in the unsatisfiable core [2021-05-02 12:50:13,230 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:50:13,324 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:13,341 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 233 proven. 392 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 12:50:13,341 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1903054101] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:13,341 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:50:13,341 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2021-05-02 12:50:13,341 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1646742271] [2021-05-02 12:50:13,342 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 12:50:13,342 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:50:13,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 12:50:13,342 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2021-05-02 12:50:13,342 INFO L87 Difference]: Start difference. First operand 76 states and 82 transitions. Second operand has 21 states, 21 states have (on average 3.0476190476190474) internal successors, (64), 20 states have internal predecessors, (64), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:14,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:50:14,259 INFO L93 Difference]: Finished difference Result 100 states and 112 transitions. [2021-05-02 12:50:14,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 12:50:14,259 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 3.0476190476190474) internal successors, (64), 20 states have internal predecessors, (64), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 74 [2021-05-02 12:50:14,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:50:14,260 INFO L225 Difference]: With dead ends: 100 [2021-05-02 12:50:14,260 INFO L226 Difference]: Without dead ends: 80 [2021-05-02 12:50:14,260 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 76 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 693.1ms TimeCoverageRelationStatistics Valid=141, Invalid=1265, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 12:50:14,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-05-02 12:50:14,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2021-05-02 12:50:14,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 74 states have (on average 1.0945945945945945) internal successors, (81), 74 states have internal predecessors, (81), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:14,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 85 transitions. [2021-05-02 12:50:14,265 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 85 transitions. Word has length 74 [2021-05-02 12:50:14,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:50:14,265 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 85 transitions. [2021-05-02 12:50:14,265 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 3.0476190476190474) internal successors, (64), 20 states have internal predecessors, (64), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:14,265 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 85 transitions. [2021-05-02 12:50:14,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-02 12:50:14,266 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:50:14,266 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 17, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:50:14,484 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-05-02 12:50:14,484 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:50:14,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:50:14,485 INFO L82 PathProgramCache]: Analyzing trace with hash -1072374558, now seen corresponding path program 15 times [2021-05-02 12:50:14,485 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:50:14,485 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [66240723] [2021-05-02 12:50:14,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:50:14,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:14,771 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:50:14,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:14,774 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 247 proven. 442 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 12:50:14,775 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:50:14,775 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [66240723] [2021-05-02 12:50:14,775 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [66240723] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:14,775 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1354240306] [2021-05-02 12:50:14,775 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:50:14,856 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-05-02 12:50:14,856 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:50:14,858 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 12:50:14,859 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:50:14,888 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:15,159 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:15,161 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:15,163 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:15,211 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 0 proven. 273 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2021-05-02 12:50:15,211 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1354240306] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:15,211 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:50:15,211 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 11] total 30 [2021-05-02 12:50:15,212 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [112796075] [2021-05-02 12:50:15,212 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-02 12:50:15,212 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:50:15,212 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-02 12:50:15,213 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=796, Unknown=0, NotChecked=0, Total=870 [2021-05-02 12:50:15,213 INFO L87 Difference]: Start difference. First operand 79 states and 85 transitions. Second operand has 30 states, 29 states have (on average 2.9310344827586206) internal successors, (85), 28 states have internal predecessors, (85), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:17,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:50:17,098 INFO L93 Difference]: Finished difference Result 109 states and 123 transitions. [2021-05-02 12:50:17,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-02 12:50:17,098 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 29 states have (on average 2.9310344827586206) internal successors, (85), 28 states have internal predecessors, (85), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 77 [2021-05-02 12:50:17,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:50:17,099 INFO L225 Difference]: With dead ends: 109 [2021-05-02 12:50:17,099 INFO L226 Difference]: Without dead ends: 86 [2021-05-02 12:50:17,100 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 71 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 360 ImplicationChecksByTransitivity, 1472.8ms TimeCoverageRelationStatistics Valid=256, Invalid=2936, Unknown=0, NotChecked=0, Total=3192 [2021-05-02 12:50:17,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-05-02 12:50:17,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2021-05-02 12:50:17,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 80 states have (on average 1.1) internal successors, (88), 80 states have internal predecessors, (88), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:17,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 92 transitions. [2021-05-02 12:50:17,104 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 92 transitions. Word has length 77 [2021-05-02 12:50:17,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:50:17,105 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 92 transitions. [2021-05-02 12:50:17,105 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 29 states have (on average 2.9310344827586206) internal successors, (85), 28 states have internal predecessors, (85), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:17,105 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 92 transitions. [2021-05-02 12:50:17,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-02 12:50:17,105 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:50:17,105 INFO L523 BasicCegarLoop]: trace histogram [24, 24, 18, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:50:17,324 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:50:17,324 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:50:17,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:50:17,325 INFO L82 PathProgramCache]: Analyzing trace with hash 936877732, now seen corresponding path program 16 times [2021-05-02 12:50:17,325 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:50:17,325 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [503998375] [2021-05-02 12:50:17,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:50:17,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:17,626 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:50:17,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:17,631 INFO L134 CoverageAnalysis]: Checked inductivity of 852 backedges. 317 proven. 495 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 12:50:17,631 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:50:17,631 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [503998375] [2021-05-02 12:50:17,631 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [503998375] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:17,631 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1992569588] [2021-05-02 12:50:17,631 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 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:50:17,687 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:50:17,688 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:50:17,689 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 39 conjunts are in the unsatisfiable core [2021-05-02 12:50:17,690 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:50:17,794 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:17,812 INFO L134 CoverageAnalysis]: Checked inductivity of 852 backedges. 317 proven. 495 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 12:50:17,812 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1992569588] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:17,813 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:50:17,813 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2021-05-02 12:50:17,813 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [479091816] [2021-05-02 12:50:17,813 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 12:50:17,813 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:50:17,813 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 12:50:17,814 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2021-05-02 12:50:17,814 INFO L87 Difference]: Start difference. First operand 85 states and 92 transitions. Second operand has 23 states, 23 states have (on average 3.0434782608695654) internal successors, (70), 22 states have internal predecessors, (70), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:18,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:50:18,881 INFO L93 Difference]: Finished difference Result 112 states and 126 transitions. [2021-05-02 12:50:18,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 12:50:18,882 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 3.0434782608695654) internal successors, (70), 22 states have internal predecessors, (70), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 83 [2021-05-02 12:50:18,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:50:18,883 INFO L225 Difference]: With dead ends: 112 [2021-05-02 12:50:18,883 INFO L226 Difference]: Without dead ends: 89 [2021-05-02 12:50:18,884 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 85 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 175 ImplicationChecksByTransitivity, 819.5ms TimeCoverageRelationStatistics Valid=157, Invalid=1565, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 12:50:18,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-05-02 12:50:18,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 88. [2021-05-02 12:50:18,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 83 states have (on average 1.0963855421686748) internal successors, (91), 83 states have internal predecessors, (91), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:18,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 95 transitions. [2021-05-02 12:50:18,888 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 95 transitions. Word has length 83 [2021-05-02 12:50:18,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:50:18,888 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 95 transitions. [2021-05-02 12:50:18,888 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 3.0434782608695654) internal successors, (70), 22 states have internal predecessors, (70), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:18,888 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 95 transitions. [2021-05-02 12:50:18,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-05-02 12:50:18,889 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:50:18,889 INFO L523 BasicCegarLoop]: trace histogram [25, 25, 19, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:50:19,106 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-05-02 12:50:19,107 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:50:19,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:50:19,107 INFO L82 PathProgramCache]: Analyzing trace with hash -659655796, now seen corresponding path program 17 times [2021-05-02 12:50:19,107 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:50:19,107 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1014872485] [2021-05-02 12:50:19,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:50:19,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:19,427 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:50:19,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:19,431 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 334 proven. 551 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 12:50:19,431 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:50:19,431 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1014872485] [2021-05-02 12:50:19,431 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1014872485] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:19,431 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1941637962] [2021-05-02 12:50:19,431 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 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:50:25,597 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 26 check-sat command(s) [2021-05-02 12:50:25,598 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:50:25,603 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 62 conjunts are in the unsatisfiable core [2021-05-02 12:50:25,604 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:50:25,932 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 334 proven. 551 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 12:50:25,932 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1941637962] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:25,933 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:50:25,933 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 24 [2021-05-02 12:50:25,933 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [790876601] [2021-05-02 12:50:25,933 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 12:50:25,933 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:50:25,933 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 12:50:25,934 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2021-05-02 12:50:25,934 INFO L87 Difference]: Start difference. First operand 88 states and 95 transitions. Second operand has 24 states, 24 states have (on average 3.0416666666666665) internal successors, (73), 23 states have internal predecessors, (73), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:27,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:50:27,108 INFO L93 Difference]: Finished difference Result 115 states and 129 transitions. [2021-05-02 12:50:27,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-02 12:50:27,109 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 3.0416666666666665) internal successors, (73), 23 states have internal predecessors, (73), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 86 [2021-05-02 12:50:27,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:50:27,109 INFO L225 Difference]: With dead ends: 115 [2021-05-02 12:50:27,109 INFO L226 Difference]: Without dead ends: 92 [2021-05-02 12:50:27,110 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 69 SyntacticMatches, 20 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 1077.6ms TimeCoverageRelationStatistics Valid=165, Invalid=1727, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 12:50:27,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-05-02 12:50:27,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2021-05-02 12:50:27,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 86 states have (on average 1.0930232558139534) internal successors, (94), 86 states have internal predecessors, (94), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:27,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 98 transitions. [2021-05-02 12:50:27,114 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 98 transitions. Word has length 86 [2021-05-02 12:50:27,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:50:27,114 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 98 transitions. [2021-05-02 12:50:27,114 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 3.0416666666666665) internal successors, (73), 23 states have internal predecessors, (73), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:27,114 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 98 transitions. [2021-05-02 12:50:27,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-05-02 12:50:27,115 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:50:27,115 INFO L523 BasicCegarLoop]: trace histogram [26, 26, 20, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:50:27,320 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-05-02 12:50:27,321 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:50:27,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:50:27,321 INFO L82 PathProgramCache]: Analyzing trace with hash -522152540, now seen corresponding path program 18 times [2021-05-02 12:50:27,321 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:50:27,321 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1207282316] [2021-05-02 12:50:27,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:50:27,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:27,654 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:50:27,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:27,659 INFO L134 CoverageAnalysis]: Checked inductivity of 1001 backedges. 351 proven. 610 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 12:50:27,659 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:50:27,659 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1207282316] [2021-05-02 12:50:27,659 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1207282316] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:27,659 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1294997957] [2021-05-02 12:50:27,659 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 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:50:27,958 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2021-05-02 12:50:27,958 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:50:27,960 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 42 conjunts are in the unsatisfiable core [2021-05-02 12:50:27,962 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:50:28,021 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:28,531 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:28,540 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:28,546 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:28,832 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:28,834 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:28,836 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:28,906 INFO L134 CoverageAnalysis]: Checked inductivity of 1001 backedges. 145 proven. 511 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2021-05-02 12:50:28,906 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1294997957] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:28,906 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:50:28,906 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 22] total 44 [2021-05-02 12:50:28,907 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [585843589] [2021-05-02 12:50:28,907 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-02 12:50:28,907 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:50:28,907 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-02 12:50:28,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=1747, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 12:50:28,908 INFO L87 Difference]: Start difference. First operand 91 states and 98 transitions. Second operand has 44 states, 43 states have (on average 2.627906976744186) internal successors, (113), 42 states have internal predecessors, (113), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:31,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:50:31,911 INFO L93 Difference]: Finished difference Result 126 states and 143 transitions. [2021-05-02 12:50:31,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 12:50:31,911 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 43 states have (on average 2.627906976744186) internal successors, (113), 42 states have internal predecessors, (113), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 89 [2021-05-02 12:50:31,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:50:31,912 INFO L225 Difference]: With dead ends: 126 [2021-05-02 12:50:31,912 INFO L226 Difference]: Without dead ends: 100 [2021-05-02 12:50:31,913 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 729 ImplicationChecksByTransitivity, 3094.0ms TimeCoverageRelationStatistics Valid=566, Invalid=5134, Unknown=0, NotChecked=0, Total=5700 [2021-05-02 12:50:31,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-05-02 12:50:31,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2021-05-02 12:50:31,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 95 states have (on average 1.0947368421052632) internal successors, (104), 95 states have internal predecessors, (104), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:31,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 108 transitions. [2021-05-02 12:50:31,917 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 108 transitions. Word has length 89 [2021-05-02 12:50:31,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:50:31,917 INFO L480 AbstractCegarLoop]: Abstraction has 100 states and 108 transitions. [2021-05-02 12:50:31,917 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 43 states have (on average 2.627906976744186) internal successors, (113), 42 states have internal predecessors, (113), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:31,917 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 108 transitions. [2021-05-02 12:50:31,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-05-02 12:50:31,917 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:50:31,917 INFO L523 BasicCegarLoop]: trace histogram [29, 29, 22, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:50:32,118 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-05-02 12:50:32,118 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:50:32,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:50:32,118 INFO L82 PathProgramCache]: Analyzing trace with hash 1990880138, now seen corresponding path program 19 times [2021-05-02 12:50:32,118 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:50:32,118 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [492450169] [2021-05-02 12:50:32,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:50:32,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:32,680 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:50:32,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:32,684 INFO L134 CoverageAnalysis]: Checked inductivity of 1247 backedges. 453 proven. 737 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 12:50:32,684 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:50:32,684 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [492450169] [2021-05-02 12:50:32,684 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [492450169] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:32,684 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [831092661] [2021-05-02 12:50:32,684 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 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:50:32,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:32,777 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 47 conjunts are in the unsatisfiable core [2021-05-02 12:50:32,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:50:32,903 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:32,924 INFO L134 CoverageAnalysis]: Checked inductivity of 1247 backedges. 453 proven. 737 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 12:50:32,924 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [831092661] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:32,924 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:50:32,925 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25] total 27 [2021-05-02 12:50:32,925 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2038589612] [2021-05-02 12:50:32,925 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-02 12:50:32,925 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:50:32,925 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-02 12:50:32,926 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2021-05-02 12:50:32,926 INFO L87 Difference]: Start difference. First operand 100 states and 108 transitions. Second operand has 27 states, 27 states have (on average 3.037037037037037) internal successors, (82), 26 states have internal predecessors, (82), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:34,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:50:34,403 INFO L93 Difference]: Finished difference Result 130 states and 146 transitions. [2021-05-02 12:50:34,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 12:50:34,404 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 3.037037037037037) internal successors, (82), 26 states have internal predecessors, (82), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 98 [2021-05-02 12:50:34,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:50:34,404 INFO L225 Difference]: With dead ends: 130 [2021-05-02 12:50:34,404 INFO L226 Difference]: Without dead ends: 104 [2021-05-02 12:50:34,405 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 100 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 257 ImplicationChecksByTransitivity, 1165.6ms TimeCoverageRelationStatistics Valid=189, Invalid=2261, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 12:50:34,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-05-02 12:50:34,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2021-05-02 12:50:34,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 98 states have (on average 1.0918367346938775) internal successors, (107), 98 states have internal predecessors, (107), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:34,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 111 transitions. [2021-05-02 12:50:34,409 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 111 transitions. Word has length 98 [2021-05-02 12:50:34,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:50:34,409 INFO L480 AbstractCegarLoop]: Abstraction has 103 states and 111 transitions. [2021-05-02 12:50:34,409 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 3.037037037037037) internal successors, (82), 26 states have internal predecessors, (82), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:34,409 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 111 transitions. [2021-05-02 12:50:34,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-05-02 12:50:34,410 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:50:34,410 INFO L523 BasicCegarLoop]: trace histogram [30, 30, 23, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:50:34,624 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-02 12:50:34,625 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:50:34,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:50:34,625 INFO L82 PathProgramCache]: Analyzing trace with hash -2029901406, now seen corresponding path program 20 times [2021-05-02 12:50:34,625 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:50:34,625 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [132285281] [2021-05-02 12:50:34,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:50:34,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:35,032 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:50:35,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:35,040 INFO L134 CoverageAnalysis]: Checked inductivity of 1335 backedges. 473 proven. 805 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 12:50:35,040 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:50:35,040 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [132285281] [2021-05-02 12:50:35,040 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [132285281] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:35,040 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1673247765] [2021-05-02 12:50:35,040 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 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:50:35,087 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:50:35,087 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:50:35,088 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 49 conjunts are in the unsatisfiable core [2021-05-02 12:50:35,089 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:50:35,222 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:35,242 INFO L134 CoverageAnalysis]: Checked inductivity of 1335 backedges. 473 proven. 805 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 12:50:35,243 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1673247765] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:35,243 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:50:35,243 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 28 [2021-05-02 12:50:35,243 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1248241705] [2021-05-02 12:50:35,243 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 12:50:35,243 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:50:35,243 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 12:50:35,244 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2021-05-02 12:50:35,244 INFO L87 Difference]: Start difference. First operand 103 states and 111 transitions. Second operand has 28 states, 28 states have (on average 3.0357142857142856) internal successors, (85), 27 states have internal predecessors, (85), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:36,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:50:36,799 INFO L93 Difference]: Finished difference Result 133 states and 149 transitions. [2021-05-02 12:50:36,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 12:50:36,800 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 3.0357142857142856) internal successors, (85), 27 states have internal predecessors, (85), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 101 [2021-05-02 12:50:36,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:50:36,801 INFO L225 Difference]: With dead ends: 133 [2021-05-02 12:50:36,801 INFO L226 Difference]: Without dead ends: 107 [2021-05-02 12:50:36,801 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 103 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 280 ImplicationChecksByTransitivity, 1117.4ms TimeCoverageRelationStatistics Valid=197, Invalid=2455, Unknown=0, NotChecked=0, Total=2652 [2021-05-02 12:50:36,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-05-02 12:50:36,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 106. [2021-05-02 12:50:36,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 101 states have (on average 1.0891089108910892) internal successors, (110), 101 states have internal predecessors, (110), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:36,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 114 transitions. [2021-05-02 12:50:36,806 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 114 transitions. Word has length 101 [2021-05-02 12:50:36,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:50:36,806 INFO L480 AbstractCegarLoop]: Abstraction has 106 states and 114 transitions. [2021-05-02 12:50:36,806 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 3.0357142857142856) internal successors, (85), 27 states have internal predecessors, (85), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:36,806 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 114 transitions. [2021-05-02 12:50:36,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-05-02 12:50:36,806 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:50:36,807 INFO L523 BasicCegarLoop]: trace histogram [31, 31, 24, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:50:37,022 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,22 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:50:37,023 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:50:37,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:50:37,023 INFO L82 PathProgramCache]: Analyzing trace with hash 1505006730, now seen corresponding path program 21 times [2021-05-02 12:50:37,023 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:50:37,023 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1817904180] [2021-05-02 12:50:37,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:50:37,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:37,459 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:50:37,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:37,462 INFO L134 CoverageAnalysis]: Checked inductivity of 1426 backedges. 493 proven. 876 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 12:50:37,462 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:50:37,462 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1817904180] [2021-05-02 12:50:37,462 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1817904180] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:37,462 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [947169218] [2021-05-02 12:50:37,462 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 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:50:37,591 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-05-02 12:50:37,591 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:50:37,592 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 26 conjunts are in the unsatisfiable core [2021-05-02 12:50:37,593 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:50:37,628 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:38,018 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:38,019 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:38,021 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:38,103 INFO L134 CoverageAnalysis]: Checked inductivity of 1426 backedges. 0 proven. 550 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2021-05-02 12:50:38,103 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [947169218] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:38,103 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:50:38,103 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 13] total 39 [2021-05-02 12:50:38,103 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1327453014] [2021-05-02 12:50:38,104 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-02 12:50:38,104 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:50:38,104 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-02 12:50:38,104 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1383, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 12:50:38,105 INFO L87 Difference]: Start difference. First operand 106 states and 114 transitions. Second operand has 39 states, 38 states have (on average 2.9473684210526314) internal successors, (112), 37 states have internal predecessors, (112), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:41,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:50:41,039 INFO L93 Difference]: Finished difference Result 142 states and 160 transitions. [2021-05-02 12:50:41,039 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-02 12:50:41,039 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 2.9473684210526314) internal successors, (112), 37 states have internal predecessors, (112), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 104 [2021-05-02 12:50:41,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:50:41,040 INFO L225 Difference]: With dead ends: 142 [2021-05-02 12:50:41,040 INFO L226 Difference]: Without dead ends: 113 [2021-05-02 12:50:41,041 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 96 SyntacticMatches, 1 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 641 ImplicationChecksByTransitivity, 2186.4ms TimeCoverageRelationStatistics Valid=345, Invalid=5205, Unknown=0, NotChecked=0, Total=5550 [2021-05-02 12:50:41,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-05-02 12:50:41,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 112. [2021-05-02 12:50:41,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 107 states have (on average 1.0934579439252337) internal successors, (117), 107 states have internal predecessors, (117), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:41,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 121 transitions. [2021-05-02 12:50:41,045 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 121 transitions. Word has length 104 [2021-05-02 12:50:41,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:50:41,045 INFO L480 AbstractCegarLoop]: Abstraction has 112 states and 121 transitions. [2021-05-02 12:50:41,046 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 38 states have (on average 2.9473684210526314) internal successors, (112), 37 states have internal predecessors, (112), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:41,046 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 121 transitions. [2021-05-02 12:50:41,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-05-02 12:50:41,046 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:50:41,046 INFO L523 BasicCegarLoop]: trace histogram [33, 33, 25, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:50:41,259 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:50:41,259 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:50:41,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:50:41,260 INFO L82 PathProgramCache]: Analyzing trace with hash 1259990732, now seen corresponding path program 22 times [2021-05-02 12:50:41,260 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:50:41,260 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1315988951] [2021-05-02 12:50:41,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:50:41,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:41,717 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:50:41,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:41,721 INFO L134 CoverageAnalysis]: Checked inductivity of 1617 backedges. 590 proven. 950 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 12:50:41,721 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:50:41,721 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1315988951] [2021-05-02 12:50:41,721 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1315988951] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:41,721 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [115860609] [2021-05-02 12:50:41,721 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 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:50:41,769 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:50:41,769 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:50:41,770 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 53 conjunts are in the unsatisfiable core [2021-05-02 12:50:41,771 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:50:41,897 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:50:41,922 INFO L134 CoverageAnalysis]: Checked inductivity of 1617 backedges. 590 proven. 950 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 12:50:41,923 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [115860609] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:41,923 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:50:41,923 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 30 [2021-05-02 12:50:41,923 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1577164005] [2021-05-02 12:50:41,923 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-02 12:50:41,923 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:50:41,924 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-02 12:50:41,924 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2021-05-02 12:50:41,924 INFO L87 Difference]: Start difference. First operand 112 states and 121 transitions. Second operand has 30 states, 30 states have (on average 3.033333333333333) internal successors, (91), 29 states have internal predecessors, (91), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:43,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:50:43,563 INFO L93 Difference]: Finished difference Result 145 states and 163 transitions. [2021-05-02 12:50:43,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-02 12:50:43,563 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 3.033333333333333) internal successors, (91), 29 states have internal predecessors, (91), 2 states have call successors, (4), 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 110 [2021-05-02 12:50:43,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:50:43,564 INFO L225 Difference]: With dead ends: 145 [2021-05-02 12:50:43,564 INFO L226 Difference]: Without dead ends: 116 [2021-05-02 12:50:43,565 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 112 SyntacticMatches, 1 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 329 ImplicationChecksByTransitivity, 1194.6ms TimeCoverageRelationStatistics Valid=213, Invalid=2867, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 12:50:43,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-05-02 12:50:43,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 115. [2021-05-02 12:50:43,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 110 states have (on average 1.0909090909090908) internal successors, (120), 110 states have internal predecessors, (120), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:43,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 124 transitions. [2021-05-02 12:50:43,569 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 124 transitions. Word has length 110 [2021-05-02 12:50:43,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:50:43,569 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 124 transitions. [2021-05-02 12:50:43,570 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 3.033333333333333) internal successors, (91), 29 states have internal predecessors, (91), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:50:43,570 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 124 transitions. [2021-05-02 12:50:43,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-05-02 12:50:43,570 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:50:43,570 INFO L523 BasicCegarLoop]: trace histogram [34, 34, 26, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:50:43,770 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-05-02 12:50:43,771 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:50:43,771 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:50:43,771 INFO L82 PathProgramCache]: Analyzing trace with hash 739068132, now seen corresponding path program 23 times [2021-05-02 12:50:43,771 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:50:43,771 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1771093027] [2021-05-02 12:50:43,771 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:50:43,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:44,270 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:50:44,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:50:44,273 INFO L134 CoverageAnalysis]: Checked inductivity of 1717 backedges. 613 proven. 1027 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 12:50:44,273 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:50:44,273 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1771093027] [2021-05-02 12:50:44,273 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1771093027] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:50:44,273 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1631257778] [2021-05-02 12:50:44,274 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 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:51:13,180 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 35 check-sat command(s) [2021-05-02 12:51:13,180 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:51:13,188 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 60 conjunts are in the unsatisfiable core [2021-05-02 12:51:13,189 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:51:13,388 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:51:13,408 INFO L134 CoverageAnalysis]: Checked inductivity of 1717 backedges. 487 proven. 1190 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 12:51:13,409 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1631257778] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:51:13,409 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:51:13,409 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 31] total 33 [2021-05-02 12:51:13,409 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [222670040] [2021-05-02 12:51:13,409 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-02 12:51:13,409 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:51:13,409 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-02 12:51:13,410 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=966, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 12:51:13,410 INFO L87 Difference]: Start difference. First operand 115 states and 124 transitions. Second operand has 33 states, 33 states have (on average 3.0303030303030303) internal successors, (100), 32 states have internal predecessors, (100), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:51:15,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:51:15,359 INFO L93 Difference]: Finished difference Result 154 states and 174 transitions. [2021-05-02 12:51:15,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-02 12:51:15,359 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 3.0303030303030303) internal successors, (100), 32 states have internal predecessors, (100), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 113 [2021-05-02 12:51:15,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:51:15,368 INFO L225 Difference]: With dead ends: 154 [2021-05-02 12:51:15,368 INFO L226 Difference]: Without dead ends: 125 [2021-05-02 12:51:15,370 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 112 SyntacticMatches, 2 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 418 ImplicationChecksByTransitivity, 1374.4ms TimeCoverageRelationStatistics Valid=233, Invalid=3549, Unknown=0, NotChecked=0, Total=3782 [2021-05-02 12:51:15,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2021-05-02 12:51:15,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 124. [2021-05-02 12:51:15,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 119 states have (on average 1.084033613445378) internal successors, (129), 119 states have internal predecessors, (129), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:51:15,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 133 transitions. [2021-05-02 12:51:15,380 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 133 transitions. Word has length 113 [2021-05-02 12:51:15,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:51:15,380 INFO L480 AbstractCegarLoop]: Abstraction has 124 states and 133 transitions. [2021-05-02 12:51:15,380 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 3.0303030303030303) internal successors, (100), 32 states have internal predecessors, (100), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:51:15,380 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 133 transitions. [2021-05-02 12:51:15,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-05-02 12:51:15,381 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:51:15,381 INFO L523 BasicCegarLoop]: trace histogram [37, 37, 29, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:51:15,587 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:51:15,587 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:51:15,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:51:15,587 INFO L82 PathProgramCache]: Analyzing trace with hash 694190284, now seen corresponding path program 24 times [2021-05-02 12:51:15,587 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:51:15,588 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [947523001] [2021-05-02 12:51:15,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:51:15,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:51:16,147 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:51:16,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:51:16,150 INFO L134 CoverageAnalysis]: Checked inductivity of 2035 backedges. 682 proven. 1276 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 12:51:16,150 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:51:16,151 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [947523001] [2021-05-02 12:51:16,151 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [947523001] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:51:16,151 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [951801466] [2021-05-02 12:51:16,151 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:51:17,106 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2021-05-02 12:51:17,106 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:51:17,108 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 44 conjunts are in the unsatisfiable core [2021-05-02 12:51:17,110 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:51:17,834 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:51:18,253 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:51:18,255 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:51:18,257 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:51:18,347 INFO L134 CoverageAnalysis]: Checked inductivity of 2035 backedges. 190 proven. 969 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2021-05-02 12:51:18,347 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [951801466] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:51:18,347 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:51:18,347 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 24] total 55 [2021-05-02 12:51:18,347 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1574049937] [2021-05-02 12:51:18,347 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2021-05-02 12:51:18,347 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:51:18,348 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-05-02 12:51:18,348 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=2794, Unknown=0, NotChecked=0, Total=2970 [2021-05-02 12:51:18,349 INFO L87 Difference]: Start difference. First operand 124 states and 133 transitions. Second operand has 55 states, 54 states have (on average 2.7037037037037037) internal successors, (146), 53 states have internal predecessors, (146), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:51:23,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:51:23,458 INFO L93 Difference]: Finished difference Result 165 states and 186 transitions. [2021-05-02 12:51:23,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-02 12:51:23,458 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 54 states have (on average 2.7037037037037037) internal successors, (146), 53 states have internal predecessors, (146), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 122 [2021-05-02 12:51:23,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:51:23,459 INFO L225 Difference]: With dead ends: 165 [2021-05-02 12:51:23,459 INFO L226 Difference]: Without dead ends: 133 [2021-05-02 12:51:23,461 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 103 SyntacticMatches, 1 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1180 ImplicationChecksByTransitivity, 4860.1ms TimeCoverageRelationStatistics Valid=776, Invalid=8730, Unknown=0, NotChecked=0, Total=9506 [2021-05-02 12:51:23,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-05-02 12:51:23,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2021-05-02 12:51:23,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 128 states have (on average 1.0859375) internal successors, (139), 128 states have internal predecessors, (139), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:51:23,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 143 transitions. [2021-05-02 12:51:23,465 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 143 transitions. Word has length 122 [2021-05-02 12:51:23,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:51:23,465 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 143 transitions. [2021-05-02 12:51:23,465 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 55 states, 54 states have (on average 2.7037037037037037) internal successors, (146), 53 states have internal predecessors, (146), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:51:23,465 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 143 transitions. [2021-05-02 12:51:23,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-05-02 12:51:23,466 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:51:23,466 INFO L523 BasicCegarLoop]: trace histogram [40, 40, 31, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:51:23,673 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-05-02 12:51:23,673 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:51:23,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:51:23,674 INFO L82 PathProgramCache]: Analyzing trace with hash 2037914978, now seen corresponding path program 25 times [2021-05-02 12:51:23,674 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:51:23,674 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1663318581] [2021-05-02 12:51:23,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:51:23,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:51:24,545 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:51:24,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:51:24,549 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 823 proven. 1457 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 12:51:24,550 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:51:24,550 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1663318581] [2021-05-02 12:51:24,550 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1663318581] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:51:24,550 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [693436127] [2021-05-02 12:51:24,550 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 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:51:24,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:51:24,625 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 65 conjunts are in the unsatisfiable core [2021-05-02 12:51:24,627 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:51:24,797 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:51:24,830 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 823 proven. 1457 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 12:51:24,830 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [693436127] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:51:24,830 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:51:24,830 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34] total 36 [2021-05-02 12:51:24,830 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [779456840] [2021-05-02 12:51:24,835 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-02 12:51:24,835 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:51:24,835 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-02 12:51:24,836 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1159, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 12:51:24,837 INFO L87 Difference]: Start difference. First operand 133 states and 143 transitions. Second operand has 36 states, 36 states have (on average 3.0277777777777777) internal successors, (109), 35 states have internal predecessors, (109), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:51:27,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:51:27,181 INFO L93 Difference]: Finished difference Result 169 states and 189 transitions. [2021-05-02 12:51:27,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 12:51:27,181 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 3.0277777777777777) internal successors, (109), 35 states have internal predecessors, (109), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 131 [2021-05-02 12:51:27,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:51:27,182 INFO L225 Difference]: With dead ends: 169 [2021-05-02 12:51:27,182 INFO L226 Difference]: Without dead ends: 137 [2021-05-02 12:51:27,182 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 133 SyntacticMatches, 1 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 500 ImplicationChecksByTransitivity, 1839.8ms TimeCoverageRelationStatistics Valid=261, Invalid=4295, Unknown=0, NotChecked=0, Total=4556 [2021-05-02 12:51:27,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2021-05-02 12:51:27,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 136. [2021-05-02 12:51:27,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 131 states have (on average 1.083969465648855) internal successors, (142), 131 states have internal predecessors, (142), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:51:27,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 146 transitions. [2021-05-02 12:51:27,187 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 146 transitions. Word has length 131 [2021-05-02 12:51:27,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:51:27,187 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 146 transitions. [2021-05-02 12:51:27,187 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 3.0277777777777777) internal successors, (109), 35 states have internal predecessors, (109), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:51:27,187 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 146 transitions. [2021-05-02 12:51:27,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-05-02 12:51:27,188 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:51:27,188 INFO L523 BasicCegarLoop]: trace histogram [41, 41, 32, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:51:27,396 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-05-02 12:51:27,397 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:51:27,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:51:27,397 INFO L82 PathProgramCache]: Analyzing trace with hash 1586135626, now seen corresponding path program 26 times [2021-05-02 12:51:27,397 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:51:27,397 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1075578434] [2021-05-02 12:51:27,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:51:27,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:51:28,051 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:51:28,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:51:28,054 INFO L134 CoverageAnalysis]: Checked inductivity of 2501 backedges. 849 proven. 1552 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 12:51:28,054 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:51:28,054 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1075578434] [2021-05-02 12:51:28,054 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1075578434] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:51:28,054 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1081213744] [2021-05-02 12:51:28,054 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 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:51:28,108 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:51:28,108 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:51:28,109 INFO L263 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 67 conjunts are in the unsatisfiable core [2021-05-02 12:51:28,110 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:51:28,285 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:51:28,312 INFO L134 CoverageAnalysis]: Checked inductivity of 2501 backedges. 849 proven. 1552 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 12:51:28,312 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1081213744] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:51:28,312 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:51:28,312 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35] total 37 [2021-05-02 12:51:28,312 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1050656184] [2021-05-02 12:51:28,312 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-02 12:51:28,312 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:51:28,313 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-02 12:51:28,313 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1228, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 12:51:28,313 INFO L87 Difference]: Start difference. First operand 136 states and 146 transitions. Second operand has 37 states, 37 states have (on average 3.027027027027027) internal successors, (112), 36 states have internal predecessors, (112), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:51:30,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:51:30,807 INFO L93 Difference]: Finished difference Result 172 states and 192 transitions. [2021-05-02 12:51:30,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-02 12:51:30,807 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 3.027027027027027) internal successors, (112), 36 states have internal predecessors, (112), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 134 [2021-05-02 12:51:30,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:51:30,808 INFO L225 Difference]: With dead ends: 172 [2021-05-02 12:51:30,808 INFO L226 Difference]: Without dead ends: 140 [2021-05-02 12:51:30,808 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 136 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 532 ImplicationChecksByTransitivity, 1729.4ms TimeCoverageRelationStatistics Valid=269, Invalid=4561, Unknown=0, NotChecked=0, Total=4830 [2021-05-02 12:51:30,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-05-02 12:51:30,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 139. [2021-05-02 12:51:30,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 134 states have (on average 1.0820895522388059) internal successors, (145), 134 states have internal predecessors, (145), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:51:30,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 149 transitions. [2021-05-02 12:51:30,813 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 149 transitions. Word has length 134 [2021-05-02 12:51:30,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:51:30,813 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 149 transitions. [2021-05-02 12:51:30,813 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 3.027027027027027) internal successors, (112), 36 states have internal predecessors, (112), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:51:30,813 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 149 transitions. [2021-05-02 12:51:30,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-05-02 12:51:30,814 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:51:30,814 INFO L523 BasicCegarLoop]: trace histogram [42, 42, 33, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:51:31,025 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-05-02 12:51:31,025 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:51:31,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:51:31,025 INFO L82 PathProgramCache]: Analyzing trace with hash -1240001438, now seen corresponding path program 27 times [2021-05-02 12:51:31,025 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:51:31,025 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1487773860] [2021-05-02 12:51:31,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:51:31,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:51:31,730 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:51:31,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:51:31,738 INFO L134 CoverageAnalysis]: Checked inductivity of 2625 backedges. 875 proven. 1650 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 12:51:31,738 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:51:31,738 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1487773860] [2021-05-02 12:51:31,738 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1487773860] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:51:31,738 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [675217263] [2021-05-02 12:51:31,738 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:51:31,902 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-05-02 12:51:31,902 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:51:31,903 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 12:51:31,905 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:51:32,515 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:51:32,517 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:51:32,519 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:51:32,601 INFO L134 CoverageAnalysis]: Checked inductivity of 2625 backedges. 0 proven. 975 refuted. 0 times theorem prover too weak. 1650 trivial. 0 not checked. [2021-05-02 12:51:32,601 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [675217263] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:51:32,601 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:51:32,601 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 15] total 50 [2021-05-02 12:51:32,601 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1768653463] [2021-05-02 12:51:32,602 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-02 12:51:32,602 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:51:32,602 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-02 12:51:32,602 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=2320, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 12:51:32,603 INFO L87 Difference]: Start difference. First operand 139 states and 149 transitions. Second operand has 50 states, 49 states have (on average 2.9591836734693877) internal successors, (145), 48 states have internal predecessors, (145), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:51:36,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:51:36,565 INFO L93 Difference]: Finished difference Result 181 states and 203 transitions. [2021-05-02 12:51:36,565 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-05-02 12:51:36,565 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 49 states have (on average 2.9591836734693877) internal successors, (145), 48 states have internal predecessors, (145), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 137 [2021-05-02 12:51:36,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:51:36,566 INFO L225 Difference]: With dead ends: 181 [2021-05-02 12:51:36,566 INFO L226 Difference]: Without dead ends: 146 [2021-05-02 12:51:36,567 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 128 SyntacticMatches, 0 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1093 ImplicationChecksByTransitivity, 3188.6ms TimeCoverageRelationStatistics Valid=456, Invalid=8856, Unknown=0, NotChecked=0, Total=9312 [2021-05-02 12:51:36,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2021-05-02 12:51:36,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 145. [2021-05-02 12:51:36,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 145 states, 140 states have (on average 1.0857142857142856) internal successors, (152), 140 states have internal predecessors, (152), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:51:36,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 156 transitions. [2021-05-02 12:51:36,572 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 156 transitions. Word has length 137 [2021-05-02 12:51:36,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:51:36,572 INFO L480 AbstractCegarLoop]: Abstraction has 145 states and 156 transitions. [2021-05-02 12:51:36,572 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 49 states have (on average 2.9591836734693877) internal successors, (145), 48 states have internal predecessors, (145), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:51:36,572 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 156 transitions. [2021-05-02 12:51:36,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-05-02 12:51:36,572 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:51:36,573 INFO L523 BasicCegarLoop]: trace histogram [44, 44, 34, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:51:36,775 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-05-02 12:51:36,776 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:51:36,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:51:36,776 INFO L82 PathProgramCache]: Analyzing trace with hash 757154596, now seen corresponding path program 28 times [2021-05-02 12:51:36,776 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:51:36,776 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [624666522] [2021-05-02 12:51:36,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:51:36,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:51:37,478 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:51:37,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:51:37,481 INFO L134 CoverageAnalysis]: Checked inductivity of 2882 backedges. 1005 proven. 1751 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-02 12:51:37,481 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:51:37,481 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [624666522] [2021-05-02 12:51:37,481 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [624666522] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:51:37,481 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [479373919] [2021-05-02 12:51:37,481 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 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:51:37,535 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:51:37,535 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:51:37,536 INFO L263 TraceCheckSpWp]: Trace formula consists of 285 conjuncts, 85 conjunts are in the unsatisfiable core [2021-05-02 12:51:37,538 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:51:38,014 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:51:38,027 INFO L134 CoverageAnalysis]: Checked inductivity of 2882 backedges. 333 proven. 2542 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 12:51:38,028 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [479373919] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:51:38,028 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:51:38,028 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 44] total 46 [2021-05-02 12:51:38,028 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [643106385] [2021-05-02 12:51:38,028 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-02 12:51:38,028 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:51:38,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-02 12:51:38,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=1946, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 12:51:38,029 INFO L87 Difference]: Start difference. First operand 145 states and 156 transitions. Second operand has 46 states, 46 states have (on average 3.0217391304347827) internal successors, (139), 45 states have internal predecessors, (139), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:51:40,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:51:40,688 INFO L93 Difference]: Finished difference Result 205 states and 234 transitions. [2021-05-02 12:51:40,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-02 12:51:40,688 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 3.0217391304347827) internal successors, (139), 45 states have internal predecessors, (139), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 143 [2021-05-02 12:51:40,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:51:40,689 INFO L225 Difference]: With dead ends: 205 [2021-05-02 12:51:40,689 INFO L226 Difference]: Without dead ends: 170 [2021-05-02 12:51:40,689 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 138 SyntacticMatches, 1 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 886 ImplicationChecksByTransitivity, 2083.6ms TimeCoverageRelationStatistics Valid=327, Invalid=7329, Unknown=0, NotChecked=0, Total=7656 [2021-05-02 12:51:40,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2021-05-02 12:51:40,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 169. [2021-05-02 12:51:40,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 169 states, 164 states have (on average 1.0731707317073171) internal successors, (176), 164 states have internal predecessors, (176), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:51:40,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 180 transitions. [2021-05-02 12:51:40,695 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 180 transitions. Word has length 143 [2021-05-02 12:51:40,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:51:40,695 INFO L480 AbstractCegarLoop]: Abstraction has 169 states and 180 transitions. [2021-05-02 12:51:40,695 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 46 states have (on average 3.0217391304347827) internal successors, (139), 45 states have internal predecessors, (139), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:51:40,695 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 180 transitions. [2021-05-02 12:51:40,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2021-05-02 12:51:40,696 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:51:40,696 INFO L523 BasicCegarLoop]: trace histogram [52, 52, 42, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:51:40,911 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable40 [2021-05-02 12:51:40,911 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:51:40,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:51:40,912 INFO L82 PathProgramCache]: Analyzing trace with hash -1749835996, now seen corresponding path program 29 times [2021-05-02 12:51:40,912 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:51:40,912 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [119287942] [2021-05-02 12:51:40,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:51:40,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:51:41,845 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:51:41,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:51:41,849 INFO L134 CoverageAnalysis]: Checked inductivity of 4030 backedges. 1237 proven. 2667 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-02 12:51:41,850 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:51:41,850 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [119287942] [2021-05-02 12:51:41,850 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [119287942] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:51:41,850 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1018436386] [2021-05-02 12:51:41,850 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 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:56:39,988 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 53 check-sat command(s) [2021-05-02 12:56:39,988 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:56:40,009 INFO L263 TraceCheckSpWp]: Trace formula consists of 317 conjuncts, 136 conjunts are in the unsatisfiable core [2021-05-02 12:56:40,011 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:56:41,145 INFO L134 CoverageAnalysis]: Checked inductivity of 4030 backedges. 1237 proven. 2667 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-02 12:56:41,145 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1018436386] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:41,145 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:56:41,146 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 45] total 47 [2021-05-02 12:56:41,146 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [853745695] [2021-05-02 12:56:41,146 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-02 12:56:41,146 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:56:41,146 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-02 12:56:41,146 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=2028, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 12:56:41,147 INFO L87 Difference]: Start difference. First operand 169 states and 180 transitions. Second operand has 47 states, 47 states have (on average 3.021276595744681) internal successors, (142), 46 states have internal predecessors, (142), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:56:44,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:56:44,965 INFO L93 Difference]: Finished difference Result 208 states and 230 transitions. [2021-05-02 12:56:44,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-02 12:56:44,965 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 3.021276595744681) internal successors, (142), 46 states have internal predecessors, (142), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 167 [2021-05-02 12:56:44,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:56:44,966 INFO L225 Difference]: With dead ends: 208 [2021-05-02 12:56:44,966 INFO L226 Difference]: Without dead ends: 173 [2021-05-02 12:56:44,967 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 128 SyntacticMatches, 42 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 987 ImplicationChecksByTransitivity, 3369.5ms TimeCoverageRelationStatistics Valid=349, Invalid=7661, Unknown=0, NotChecked=0, Total=8010 [2021-05-02 12:56:44,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2021-05-02 12:56:44,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 172. [2021-05-02 12:56:44,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 172 states, 167 states have (on average 1.0718562874251496) internal successors, (179), 167 states have internal predecessors, (179), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:56:44,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 183 transitions. [2021-05-02 12:56:44,972 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 183 transitions. Word has length 167 [2021-05-02 12:56:44,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:56:44,972 INFO L480 AbstractCegarLoop]: Abstraction has 172 states and 183 transitions. [2021-05-02 12:56:44,973 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 3.021276595744681) internal successors, (142), 46 states have internal predecessors, (142), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:56:44,973 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 183 transitions. [2021-05-02 12:56:44,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2021-05-02 12:56:44,973 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:56:44,973 INFO L523 BasicCegarLoop]: trace histogram [53, 53, 43, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:56:45,178 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:56:45,178 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:56:45,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:56:45,179 INFO L82 PathProgramCache]: Analyzing trace with hash 981184524, now seen corresponding path program 30 times [2021-05-02 12:56:45,179 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:56:45,179 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [462260625] [2021-05-02 12:56:45,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:56:45,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:46,170 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:56:46,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:46,173 INFO L134 CoverageAnalysis]: Checked inductivity of 4187 backedges. 1266 proven. 2795 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-02 12:56:46,173 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:56:46,173 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [462260625] [2021-05-02 12:56:46,173 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [462260625] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:46,173 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1730725694] [2021-05-02 12:56:46,173 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 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:56:47,845 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 31 check-sat command(s) [2021-05-02 12:56:47,845 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:56:47,847 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-02 12:56:47,849 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:56:48,441 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:48,442 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:48,444 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:48,512 INFO L134 CoverageAnalysis]: Checked inductivity of 4187 backedges. 0 proven. 1392 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2021-05-02 12:56:48,512 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1730725694] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:48,513 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:56:48,513 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 16] total 61 [2021-05-02 12:56:48,513 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1126178513] [2021-05-02 12:56:48,513 INFO L460 AbstractCegarLoop]: Interpolant automaton has 61 states [2021-05-02 12:56:48,513 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:56:48,513 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-05-02 12:56:48,514 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=3498, Unknown=0, NotChecked=0, Total=3660 [2021-05-02 12:56:48,514 INFO L87 Difference]: Start difference. First operand 172 states and 183 transitions. Second operand has 61 states, 60 states have (on average 2.966666666666667) internal successors, (178), 59 states have internal predecessors, (178), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:56:55,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:56:55,008 INFO L93 Difference]: Finished difference Result 217 states and 241 transitions. [2021-05-02 12:56:55,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-05-02 12:56:55,009 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 60 states have (on average 2.966666666666667) internal successors, (178), 59 states have internal predecessors, (178), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 170 [2021-05-02 12:56:55,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:56:55,010 INFO L225 Difference]: With dead ends: 217 [2021-05-02 12:56:55,010 INFO L226 Difference]: Without dead ends: 179 [2021-05-02 12:56:55,011 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 160 SyntacticMatches, 0 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1666 ImplicationChecksByTransitivity, 4161.0ms TimeCoverageRelationStatistics Valid=572, Invalid=13470, Unknown=0, NotChecked=0, Total=14042 [2021-05-02 12:56:55,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2021-05-02 12:56:55,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 178. [2021-05-02 12:56:55,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178 states, 173 states have (on average 1.0751445086705202) internal successors, (186), 173 states have internal predecessors, (186), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:56:55,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 190 transitions. [2021-05-02 12:56:55,022 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 190 transitions. Word has length 170 [2021-05-02 12:56:55,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:56:55,022 INFO L480 AbstractCegarLoop]: Abstraction has 178 states and 190 transitions. [2021-05-02 12:56:55,022 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 61 states, 60 states have (on average 2.966666666666667) internal successors, (178), 59 states have internal predecessors, (178), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:56:55,022 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 190 transitions. [2021-05-02 12:56:55,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2021-05-02 12:56:55,023 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:56:55,023 INFO L523 BasicCegarLoop]: trace histogram [55, 55, 44, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:56:55,228 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,32 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:56:55,228 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:56:55,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:56:55,229 INFO L82 PathProgramCache]: Analyzing trace with hash -466275830, now seen corresponding path program 31 times [2021-05-02 12:56:55,229 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:56:55,229 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1467666060] [2021-05-02 12:56:55,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:56:55,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:56,342 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:56:56,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:56,345 INFO L134 CoverageAnalysis]: Checked inductivity of 4510 backedges. 1429 proven. 2926 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 12:56:56,346 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:56:56,346 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1467666060] [2021-05-02 12:56:56,346 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1467666060] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:56,346 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [128026597] [2021-05-02 12:56:56,346 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 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:56:56,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:56,418 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 91 conjunts are in the unsatisfiable core [2021-05-02 12:56:56,420 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:56:56,654 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:56,710 INFO L134 CoverageAnalysis]: Checked inductivity of 4510 backedges. 1429 proven. 2926 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 12:56:56,710 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [128026597] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:56,710 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:56:56,710 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 47] total 49 [2021-05-02 12:56:56,711 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1373795301] [2021-05-02 12:56:56,711 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-02 12:56:56,711 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:56:56,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-02 12:56:56,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=2212, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 12:56:56,712 INFO L87 Difference]: Start difference. First operand 178 states and 190 transitions. Second operand has 49 states, 49 states have (on average 3.020408163265306) internal successors, (148), 48 states have internal predecessors, (148), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:00,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:57:00,697 INFO L93 Difference]: Finished difference Result 220 states and 244 transitions. [2021-05-02 12:57:00,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-05-02 12:57:00,698 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 3.020408163265306) internal successors, (148), 48 states have internal predecessors, (148), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 176 [2021-05-02 12:57:00,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:57:00,699 INFO L225 Difference]: With dead ends: 220 [2021-05-02 12:57:00,699 INFO L226 Difference]: Without dead ends: 182 [2021-05-02 12:57:00,699 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 271 GetRequests, 178 SyntacticMatches, 1 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 994 ImplicationChecksByTransitivity, 2730.3ms TimeCoverageRelationStatistics Valid=365, Invalid=8377, Unknown=0, NotChecked=0, Total=8742 [2021-05-02 12:57:00,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2021-05-02 12:57:00,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 181. [2021-05-02 12:57:00,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181 states, 176 states have (on average 1.0738636363636365) internal successors, (189), 176 states have internal predecessors, (189), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:00,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 193 transitions. [2021-05-02 12:57:00,705 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 193 transitions. Word has length 176 [2021-05-02 12:57:00,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:57:00,705 INFO L480 AbstractCegarLoop]: Abstraction has 181 states and 193 transitions. [2021-05-02 12:57:00,705 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 49 states have (on average 3.020408163265306) internal successors, (148), 48 states have internal predecessors, (148), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:00,705 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 193 transitions. [2021-05-02 12:57:00,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2021-05-02 12:57:00,706 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:57:00,706 INFO L523 BasicCegarLoop]: trace histogram [56, 56, 45, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:57:00,906 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2021-05-02 12:57:00,907 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:57:00,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:57:00,907 INFO L82 PathProgramCache]: Analyzing trace with hash -603085278, now seen corresponding path program 32 times [2021-05-02 12:57:00,907 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:57:00,907 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [412223459] [2021-05-02 12:57:00,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:57:00,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:57:02,113 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:57:02,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:57:02,138 INFO L134 CoverageAnalysis]: Checked inductivity of 4676 backedges. 1461 proven. 3060 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 12:57:02,138 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:57:02,138 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [412223459] [2021-05-02 12:57:02,138 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [412223459] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:57:02,138 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [167902760] [2021-05-02 12:57:02,138 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 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:57:02,228 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:57:02,228 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:57:02,230 INFO L263 TraceCheckSpWp]: Trace formula consists of 335 conjuncts, 93 conjunts are in the unsatisfiable core [2021-05-02 12:57:02,231 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:57:02,447 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:57:02,475 INFO L134 CoverageAnalysis]: Checked inductivity of 4676 backedges. 1461 proven. 3060 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 12:57:02,476 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [167902760] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:57:02,476 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:57:02,476 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 48] total 50 [2021-05-02 12:57:02,476 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [645494058] [2021-05-02 12:57:02,476 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-02 12:57:02,476 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:57:02,477 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-02 12:57:02,477 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=2307, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 12:57:02,477 INFO L87 Difference]: Start difference. First operand 181 states and 193 transitions. Second operand has 50 states, 50 states have (on average 3.02) internal successors, (151), 49 states have internal predecessors, (151), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:05,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:57:05,662 INFO L93 Difference]: Finished difference Result 223 states and 247 transitions. [2021-05-02 12:57:05,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-02 12:57:05,663 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 3.02) internal successors, (151), 49 states have internal predecessors, (151), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 179 [2021-05-02 12:57:05,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:57:05,663 INFO L225 Difference]: With dead ends: 223 [2021-05-02 12:57:05,663 INFO L226 Difference]: Without dead ends: 185 [2021-05-02 12:57:05,664 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 181 SyntacticMatches, 1 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1039 ImplicationChecksByTransitivity, 2457.2ms TimeCoverageRelationStatistics Valid=373, Invalid=8747, Unknown=0, NotChecked=0, Total=9120 [2021-05-02 12:57:05,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-05-02 12:57:05,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 184. [2021-05-02 12:57:05,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 184 states, 179 states have (on average 1.0726256983240223) internal successors, (192), 179 states have internal predecessors, (192), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:05,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 196 transitions. [2021-05-02 12:57:05,673 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 196 transitions. Word has length 179 [2021-05-02 12:57:05,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:57:05,673 INFO L480 AbstractCegarLoop]: Abstraction has 184 states and 196 transitions. [2021-05-02 12:57:05,673 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 3.02) internal successors, (151), 49 states have internal predecessors, (151), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:05,673 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 196 transitions. [2021-05-02 12:57:05,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2021-05-02 12:57:05,674 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:57:05,674 INFO L523 BasicCegarLoop]: trace histogram [57, 57, 46, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:57:05,890 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2021-05-02 12:57:05,890 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:57:05,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:57:05,890 INFO L82 PathProgramCache]: Analyzing trace with hash -369386742, now seen corresponding path program 33 times [2021-05-02 12:57:05,891 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:57:05,891 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [486027189] [2021-05-02 12:57:05,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:57:05,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:57:07,058 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:57:07,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:57:07,062 INFO L134 CoverageAnalysis]: Checked inductivity of 4845 backedges. 1493 proven. 3197 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 12:57:07,062 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:57:07,062 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [486027189] [2021-05-02 12:57:07,062 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [486027189] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:57:07,062 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1530166861] [2021-05-02 12:57:07,062 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 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:57:07,288 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2021-05-02 12:57:07,289 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:57:07,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 35 conjunts are in the unsatisfiable core [2021-05-02 12:57:07,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:57:08,131 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:57:08,267 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:57:08,268 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:57:08,269 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:57:08,378 INFO L134 CoverageAnalysis]: Checked inductivity of 4845 backedges. 0 proven. 1648 refuted. 0 times theorem prover too weak. 3197 trivial. 0 not checked. [2021-05-02 12:57:08,378 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1530166861] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:57:08,378 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:57:08,379 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 18] total 66 [2021-05-02 12:57:08,379 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1834389590] [2021-05-02 12:57:08,379 INFO L460 AbstractCegarLoop]: Interpolant automaton has 66 states [2021-05-02 12:57:08,379 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:57:08,379 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-05-02 12:57:08,380 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=4114, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 12:57:08,380 INFO L87 Difference]: Start difference. First operand 184 states and 196 transitions. Second operand has 66 states, 65 states have (on average 2.923076923076923) internal successors, (190), 64 states have internal predecessors, (190), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:15,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:57:15,397 INFO L93 Difference]: Finished difference Result 233 states and 259 transitions. [2021-05-02 12:57:15,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2021-05-02 12:57:15,398 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 65 states have (on average 2.923076923076923) internal successors, (190), 64 states have internal predecessors, (190), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 182 [2021-05-02 12:57:15,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:57:15,398 INFO L225 Difference]: With dead ends: 233 [2021-05-02 12:57:15,398 INFO L226 Difference]: Without dead ends: 192 [2021-05-02 12:57:15,399 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 297 GetRequests, 170 SyntacticMatches, 0 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2032 ImplicationChecksByTransitivity, 5082.0ms TimeCoverageRelationStatistics Valid=620, Invalid=15892, Unknown=0, NotChecked=0, Total=16512 [2021-05-02 12:57:15,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2021-05-02 12:57:15,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 190. [2021-05-02 12:57:15,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 190 states, 185 states have (on average 1.0756756756756756) internal successors, (199), 185 states have internal predecessors, (199), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:15,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 203 transitions. [2021-05-02 12:57:15,429 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 203 transitions. Word has length 182 [2021-05-02 12:57:15,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:57:15,429 INFO L480 AbstractCegarLoop]: Abstraction has 190 states and 203 transitions. [2021-05-02 12:57:15,429 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 66 states, 65 states have (on average 2.923076923076923) internal successors, (190), 64 states have internal predecessors, (190), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:15,429 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 203 transitions. [2021-05-02 12:57:15,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2021-05-02 12:57:15,430 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:57:15,430 INFO L523 BasicCegarLoop]: trace histogram [59, 59, 47, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:57:15,630 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2021-05-02 12:57:15,631 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:57:15,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:57:15,631 INFO L82 PathProgramCache]: Analyzing trace with hash -1017945524, now seen corresponding path program 34 times [2021-05-02 12:57:15,631 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:57:15,631 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1249833660] [2021-05-02 12:57:15,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:57:15,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:57:16,883 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:57:16,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:57:16,887 INFO L134 CoverageAnalysis]: Checked inductivity of 5192 backedges. 1668 proven. 3337 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2021-05-02 12:57:16,887 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:57:16,887 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1249833660] [2021-05-02 12:57:16,887 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1249833660] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:57:16,887 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [229675684] [2021-05-02 12:57:16,887 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 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:57:16,951 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:57:16,951 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:57:16,953 INFO L263 TraceCheckSpWp]: Trace formula consists of 349 conjuncts, 97 conjunts are in the unsatisfiable core [2021-05-02 12:57:16,954 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:57:17,206 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:57:17,245 INFO L134 CoverageAnalysis]: Checked inductivity of 5192 backedges. 1668 proven. 3337 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2021-05-02 12:57:17,245 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [229675684] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:57:17,245 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:57:17,245 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 50] total 52 [2021-05-02 12:57:17,245 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [777876837] [2021-05-02 12:57:17,246 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2021-05-02 12:57:17,246 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:57:17,246 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-05-02 12:57:17,246 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=2503, Unknown=0, NotChecked=0, Total=2652 [2021-05-02 12:57:17,246 INFO L87 Difference]: Start difference. First operand 190 states and 203 transitions. Second operand has 52 states, 52 states have (on average 3.019230769230769) internal successors, (157), 51 states have internal predecessors, (157), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:22,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:57:22,031 INFO L93 Difference]: Finished difference Result 235 states and 261 transitions. [2021-05-02 12:57:22,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-02 12:57:22,032 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 3.019230769230769) internal successors, (157), 51 states have internal predecessors, (157), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 188 [2021-05-02 12:57:22,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:57:22,032 INFO L225 Difference]: With dead ends: 235 [2021-05-02 12:57:22,033 INFO L226 Difference]: Without dead ends: 194 [2021-05-02 12:57:22,033 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 190 SyntacticMatches, 1 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1132 ImplicationChecksByTransitivity, 3119.0ms TimeCoverageRelationStatistics Valid=389, Invalid=9511, Unknown=0, NotChecked=0, Total=9900 [2021-05-02 12:57:22,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2021-05-02 12:57:22,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 193. [2021-05-02 12:57:22,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 188 states have (on average 1.074468085106383) internal successors, (202), 188 states have internal predecessors, (202), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:22,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 206 transitions. [2021-05-02 12:57:22,039 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 206 transitions. Word has length 188 [2021-05-02 12:57:22,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:57:22,039 INFO L480 AbstractCegarLoop]: Abstraction has 193 states and 206 transitions. [2021-05-02 12:57:22,039 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 52 states, 52 states have (on average 3.019230769230769) internal successors, (157), 51 states have internal predecessors, (157), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:57:22,040 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 206 transitions. [2021-05-02 12:57:22,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2021-05-02 12:57:22,040 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:57:22,040 INFO L523 BasicCegarLoop]: trace histogram [60, 60, 48, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:57:22,241 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-05-02 12:57:22,241 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:57:22,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:57:22,241 INFO L82 PathProgramCache]: Analyzing trace with hash 1919316580, now seen corresponding path program 35 times [2021-05-02 12:57:22,241 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:57:22,241 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1549076192] [2021-05-02 12:57:22,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:57:22,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:57:23,519 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:57:23,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:57:23,524 INFO L134 CoverageAnalysis]: Checked inductivity of 5370 backedges. 1703 proven. 3480 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2021-05-02 12:57:23,524 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:57:23,524 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1549076192] [2021-05-02 12:57:23,524 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1549076192] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:57:23,524 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [413375539] [2021-05-02 12:57:23,524 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 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true