/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/nested3-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 00:46:51,803 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 00:46:51,806 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 00:46:51,842 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 00:46:51,860 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-06 00:46:51,862 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-06 00:46:51,863 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-06 00:46:51,865 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-06 00:46:51,867 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-06 00:46:51,867 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-06 00:46:51,869 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-06 00:46:51,874 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-06 00:46:51,875 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-06 00:46:51,877 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-06 00:46:51,879 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-06 00:46:51,881 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-06 00:46:51,886 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-06 00:46:51,893 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 00:46:51,894 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 00:46:51,895 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 00:46:51,895 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 [2021-05-06 00:46:51,950 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 00:46:51,951 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 00:46:51,953 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-06 00:46:51,953 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-06 00:46:51,953 INFO L138 SettingsManager]: * Use SBE=true [2021-05-06 00:46:51,954 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 00:46:51,954 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 00:46:51,954 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 00:46:51,954 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 00:46:51,954 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 00:46:51,955 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 00:46:51,955 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 00:46:51,955 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 00:46:51,956 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 00:46:51,956 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 00:46:51,956 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 00:46:51,956 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 00:46:51,956 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 00:46:51,957 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 00:46:51,957 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 00:46:51,957 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 00:46:51,957 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 00:46:51,957 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-06 00:46:51,958 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-06 00:46:51,958 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-06 00:46:51,958 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-06 00:46:51,958 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 00:46:51,958 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-06 00:46:51,958 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 00:46:52,310 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 00:46:52,338 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 00:46:52,340 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 00:46:52,341 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 00:46:52,342 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 00:46:52,342 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/nested3-1.c [2021-05-06 00:46:52,402 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/abd9a6b7d/da3f0d33b9e7484991b18fee87fe076d/FLAG4976bc7bc [2021-05-06 00:46:52,785 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 00:46:52,786 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/nested3-1.c [2021-05-06 00:46:52,790 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/abd9a6b7d/da3f0d33b9e7484991b18fee87fe076d/FLAG4976bc7bc [2021-05-06 00:46:53,205 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/abd9a6b7d/da3f0d33b9e7484991b18fee87fe076d [2021-05-06 00:46:53,207 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 00:46:53,208 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 00:46:53,225 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 00:46:53,225 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 00:46:53,229 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 00:46:53,229 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 12:46:53" (1/1) ... [2021-05-06 00:46:53,230 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2610a055 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:46:53, skipping insertion in model container [2021-05-06 00:46:53,230 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 12:46:53" (1/1) ... [2021-05-06 00:46:53,238 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 00:46:53,250 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 00:46:53,355 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/nested3-1.c[321,334] [2021-05-06 00:46:53,372 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 00:46:53,378 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 00:46:53,403 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/nested3-1.c[321,334] [2021-05-06 00:46:53,407 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 00:46:53,437 INFO L208 MainTranslator]: Completed translation [2021-05-06 00:46:53,437 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:46:53 WrapperNode [2021-05-06 00:46:53,437 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 00:46:53,440 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 00:46:53,440 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 00:46:53,441 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 00:46:53,450 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:46:53" (1/1) ... [2021-05-06 00:46:53,450 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:46:53" (1/1) ... [2021-05-06 00:46:53,458 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:46:53" (1/1) ... [2021-05-06 00:46:53,458 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:46:53" (1/1) ... [2021-05-06 00:46:53,466 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:46:53" (1/1) ... [2021-05-06 00:46:53,469 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:46:53" (1/1) ... [2021-05-06 00:46:53,473 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:46:53" (1/1) ... [2021-05-06 00:46:53,474 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 00:46:53,475 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 00:46:53,475 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 00:46:53,475 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 00:46:53,476 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:46:53" (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 [2021-05-06 00:46:53,526 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 00:46:53,526 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 00:46:53,526 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 00:46:53,526 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 00:46:53,526 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 00:46:53,526 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 00:46:53,526 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 00:46:53,527 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 00:46:53,527 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 00:46:53,527 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 00:46:53,527 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 00:46:53,527 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 00:46:53,527 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 00:46:53,527 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 00:46:53,527 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 00:46:53,528 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 00:46:53,528 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 00:46:53,793 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 00:46:53,793 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2021-05-06 00:46:53,794 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 12:46:53 BoogieIcfgContainer [2021-05-06 00:46:53,794 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 00:46:53,795 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 00:46:53,795 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 00:46:53,798 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 00:46:53,798 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 12:46:53" (1/3) ... [2021-05-06 00:46:53,798 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@16aff7e0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 12:46:53, skipping insertion in model container [2021-05-06 00:46:53,799 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:46:53" (2/3) ... [2021-05-06 00:46:53,799 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@16aff7e0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 12:46:53, skipping insertion in model container [2021-05-06 00:46:53,799 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 12:46:53" (3/3) ... [2021-05-06 00:46:53,800 INFO L111 eAbstractionObserver]: Analyzing ICFG nested3-1.c [2021-05-06 00:46:53,804 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-06 00:46:53,807 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 00:46:53,821 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 00:46:53,838 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 00:46:53,838 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 00:46:53,838 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-06 00:46:53,838 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 00:46:53,838 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 00:46:53,838 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 00:46:53,839 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 00:46:53,839 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 00:46:53,861 INFO L276 IsEmpty]: Start isEmpty. Operand has 25 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 16 states have internal predecessors, (23), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 00:46:53,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-06 00:46:53,864 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:46:53,865 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:46:53,865 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:46:53,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:46:53,869 INFO L82 PathProgramCache]: Analyzing trace with hash -1794590667, now seen corresponding path program 1 times [2021-05-06 00:46:53,880 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:46:53,881 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [664120477] [2021-05-06 00:46:53,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:46:53,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:46:54,066 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:46:54,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:46:54,090 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:46:54,091 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:46:54,091 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [664120477] [2021-05-06 00:46:54,092 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [664120477] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 00:46:54,092 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 00:46:54,092 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 00:46:54,093 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1344888072] [2021-05-06 00:46:54,097 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 00:46:54,097 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:46:54,109 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 00:46:54,110 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 00:46:54,112 INFO L87 Difference]: Start difference. First operand has 25 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 16 states have internal predecessors, (23), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) 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) [2021-05-06 00:46:54,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:46:54,181 INFO L93 Difference]: Finished difference Result 44 states and 63 transitions. [2021-05-06 00:46:54,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 00:46:54,182 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 [2021-05-06 00:46:54,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:46:54,188 INFO L225 Difference]: With dead ends: 44 [2021-05-06 00:46:54,188 INFO L226 Difference]: Without dead ends: 20 [2021-05-06 00:46:54,190 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 58.4ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 00:46:54,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-05-06 00:46:54,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-05-06 00:46:54,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 13 states have internal predecessors, (16), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 00:46:54,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2021-05-06 00:46:54,222 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 11 [2021-05-06 00:46:54,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:46:54,222 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2021-05-06 00:46:54,222 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) [2021-05-06 00:46:54,223 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2021-05-06 00:46:54,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-06 00:46:54,223 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:46:54,223 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:46:54,224 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 00:46:54,224 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:46:54,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:46:54,225 INFO L82 PathProgramCache]: Analyzing trace with hash -1824143339, now seen corresponding path program 1 times [2021-05-06 00:46:54,225 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:46:54,225 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1794411975] [2021-05-06 00:46:54,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:46:54,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:46:54,360 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:46:54,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:46:54,388 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:46:54,389 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:46:54,389 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1794411975] [2021-05-06 00:46:54,389 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1794411975] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 00:46:54,390 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 00:46:54,390 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 00:46:54,391 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1977174045] [2021-05-06 00:46:54,392 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-06 00:46:54,392 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:46:54,396 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-06 00:46:54,396 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 00:46:54,396 INFO L87 Difference]: Start difference. First operand 20 states and 24 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) [2021-05-06 00:46:54,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:46:54,519 INFO L93 Difference]: Finished difference Result 34 states and 42 transitions. [2021-05-06 00:46:54,520 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-06 00:46:54,521 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 [2021-05-06 00:46:54,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:46:54,523 INFO L225 Difference]: With dead ends: 34 [2021-05-06 00:46:54,523 INFO L226 Difference]: Without dead ends: 27 [2021-05-06 00:46:54,524 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 55.3ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-06 00:46:54,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-06 00:46:54,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 21. [2021-05-06 00:46:54,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 14 states have internal predecessors, (17), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 00:46:54,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2021-05-06 00:46:54,536 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 11 [2021-05-06 00:46:54,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:46:54,536 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2021-05-06 00:46:54,537 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) [2021-05-06 00:46:54,537 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2021-05-06 00:46:54,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-06 00:46:54,537 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:46:54,537 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:46:54,538 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 00:46:54,538 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:46:54,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:46:54,539 INFO L82 PathProgramCache]: Analyzing trace with hash -699512288, now seen corresponding path program 1 times [2021-05-06 00:46:54,539 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:46:54,540 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [294193690] [2021-05-06 00:46:54,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:46:54,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:46:54,643 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:46:54,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:46:54,657 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:46:54,657 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:46:54,657 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [294193690] [2021-05-06 00:46:54,657 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [294193690] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 00:46:54,658 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 00:46:54,658 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 00:46:54,658 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [722161355] [2021-05-06 00:46:54,658 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-06 00:46:54,658 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:46:54,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-06 00:46:54,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 00:46:54,659 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 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) [2021-05-06 00:46:54,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:46:54,746 INFO L93 Difference]: Finished difference Result 39 states and 50 transitions. [2021-05-06 00:46:54,746 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-06 00:46:54,746 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 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 12 [2021-05-06 00:46:54,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:46:54,749 INFO L225 Difference]: With dead ends: 39 [2021-05-06 00:46:54,749 INFO L226 Difference]: Without dead ends: 25 [2021-05-06 00:46:54,750 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 46.3ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-06 00:46:54,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-05-06 00:46:54,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 22. [2021-05-06 00:46:54,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 15 states have internal predecessors, (18), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 00:46:54,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2021-05-06 00:46:54,764 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 12 [2021-05-06 00:46:54,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:46:54,764 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2021-05-06 00:46:54,764 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 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) [2021-05-06 00:46:54,764 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2021-05-06 00:46:54,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-05-06 00:46:54,765 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:46:54,765 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:46:54,765 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-06 00:46:54,765 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:46:54,766 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:46:54,766 INFO L82 PathProgramCache]: Analyzing trace with hash -185588926, now seen corresponding path program 1 times [2021-05-06 00:46:54,767 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:46:54,767 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1353840380] [2021-05-06 00:46:54,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:46:54,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:46:54,827 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:46:54,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:46:54,836 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:46:54,836 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:46:54,836 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1353840380] [2021-05-06 00:46:54,837 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1353840380] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 00:46:54,837 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 00:46:54,837 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 00:46:54,837 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1949271501] [2021-05-06 00:46:54,837 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-06 00:46:54,838 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:46:54,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-06 00:46:54,838 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 00:46:54,838 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 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) [2021-05-06 00:46:54,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:46:54,923 INFO L93 Difference]: Finished difference Result 39 states and 48 transitions. [2021-05-06 00:46:54,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-06 00:46:54,923 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 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 13 [2021-05-06 00:46:54,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:46:54,925 INFO L225 Difference]: With dead ends: 39 [2021-05-06 00:46:54,925 INFO L226 Difference]: Without dead ends: 24 [2021-05-06 00:46:54,926 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 42.2ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-06 00:46:54,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-05-06 00:46:54,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2021-05-06 00:46:54,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 16 states have internal predecessors, (19), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 00:46:54,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2021-05-06 00:46:54,933 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 13 [2021-05-06 00:46:54,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:46:54,934 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2021-05-06 00:46:54,934 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 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) [2021-05-06 00:46:54,934 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2021-05-06 00:46:54,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-06 00:46:54,935 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:46:54,935 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:46:54,935 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-06 00:46:54,935 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:46:54,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:46:54,936 INFO L82 PathProgramCache]: Analyzing trace with hash -1431986846, now seen corresponding path program 1 times [2021-05-06 00:46:54,936 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:46:54,936 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [811226668] [2021-05-06 00:46:54,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:46:54,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:46:55,031 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:46:55,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:46:55,044 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:46:55,044 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:46:55,044 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [811226668] [2021-05-06 00:46:55,044 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [811226668] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:46:55,045 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [89970261] [2021-05-06 00:46:55,045 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 [2021-05-06 00:46:55,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:46:55,102 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-06 00:46:55,106 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:46:55,163 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:46:55,164 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [89970261] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:46:55,164 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:46:55,164 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-06 00:46:55,164 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1030337564] [2021-05-06 00:46:55,164 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 00:46:55,164 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:46:55,165 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 00:46:55,165 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 00:46:55,165 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:46:55,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:46:55,281 INFO L93 Difference]: Finished difference Result 41 states and 50 transitions. [2021-05-06 00:46:55,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 00:46:55,282 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-05-06 00:46:55,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:46:55,282 INFO L225 Difference]: With dead ends: 41 [2021-05-06 00:46:55,282 INFO L226 Difference]: Without dead ends: 25 [2021-05-06 00:46:55,283 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 86.4ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-06 00:46:55,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-05-06 00:46:55,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2021-05-06 00:46:55,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 16 states have (on average 1.25) internal successors, (20), 17 states have internal predecessors, (20), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 00:46:55,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2021-05-06 00:46:55,288 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 14 [2021-05-06 00:46:55,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:46:55,288 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2021-05-06 00:46:55,288 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:46:55,288 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2021-05-06 00:46:55,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-06 00:46:55,289 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:46:55,289 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:46:55,504 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:46:55,505 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:46:55,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:46:55,506 INFO L82 PathProgramCache]: Analyzing trace with hash -1415616702, now seen corresponding path program 2 times [2021-05-06 00:46:55,506 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:46:55,506 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [920921381] [2021-05-06 00:46:55,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:46:55,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:46:55,592 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:46:55,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:46:55,605 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:46:55,605 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:46:55,605 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [920921381] [2021-05-06 00:46:55,605 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [920921381] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:46:55,606 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [841184646] [2021-05-06 00:46:55,606 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:46:55,693 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 00:46:55,693 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:46:55,694 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 00:46:55,695 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:46:55,766 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:46:55,794 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:46:55,795 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [841184646] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:46:55,795 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:46:55,795 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-06 00:46:55,795 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [384808786] [2021-05-06 00:46:55,796 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 00:46:55,796 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:46:55,796 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 00:46:55,796 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-06 00:46:55,797 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:46:55,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:46:55,943 INFO L93 Difference]: Finished difference Result 43 states and 52 transitions. [2021-05-06 00:46:55,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 00:46:55,944 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-05-06 00:46:55,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:46:55,945 INFO L225 Difference]: With dead ends: 43 [2021-05-06 00:46:55,945 INFO L226 Difference]: Without dead ends: 26 [2021-05-06 00:46:55,946 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 128.2ms TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-05-06 00:46:55,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-05-06 00:46:55,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2021-05-06 00:46:55,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 00:46:55,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2021-05-06 00:46:55,954 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 15 [2021-05-06 00:46:55,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:46:55,954 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2021-05-06 00:46:55,954 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 00:46:55,955 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2021-05-06 00:46:55,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-05-06 00:46:55,955 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:46:55,955 INFO L523 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:46:56,168 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:46:56,169 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:46:56,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:46:56,169 INFO L82 PathProgramCache]: Analyzing trace with hash -908142238, now seen corresponding path program 3 times [2021-05-06 00:46:56,169 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:46:56,170 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [305174347] [2021-05-06 00:46:56,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:46:56,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:46:56,262 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:46:56,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:46:56,269 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:46:56,269 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:46:56,269 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [305174347] [2021-05-06 00:46:56,269 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [305174347] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:46:56,269 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [277945969] [2021-05-06 00:46:56,269 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:46:56,348 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-06 00:46:56,348 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:46:56,349 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-06 00:46:56,350 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:46:56,512 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:46:56,527 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:46:56,723 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-06 00:46:56,723 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [277945969] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 00:46:56,723 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-06 00:46:56,723 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [7] total 11 [2021-05-06 00:46:56,724 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [917264714] [2021-05-06 00:46:56,724 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 00:46:56,724 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:46:56,725 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 00:46:56,725 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-06 00:46:56,725 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand has 6 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 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) [2021-05-06 00:46:56,984 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2021-05-06 00:46:57,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:46:57,035 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2021-05-06 00:46:57,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 00:46:57,036 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 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 16 [2021-05-06 00:46:57,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:46:57,037 INFO L225 Difference]: With dead ends: 32 [2021-05-06 00:46:57,037 INFO L226 Difference]: Without dead ends: 30 [2021-05-06 00:46:57,037 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 509.3ms TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-06 00:46:57,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-06 00:46:57,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2021-05-06 00:46:57,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 20 states have (on average 1.2) internal successors, (24), 21 states have internal predecessors, (24), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 00:46:57,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2021-05-06 00:46:57,042 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 16 [2021-05-06 00:46:57,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:46:57,043 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2021-05-06 00:46:57,043 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 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) [2021-05-06 00:46:57,043 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2021-05-06 00:46:57,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-06 00:46:57,043 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:46:57,043 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:46:57,265 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:46:57,265 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:46:57,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:46:57,265 INFO L82 PathProgramCache]: Analyzing trace with hash -1400074750, now seen corresponding path program 1 times [2021-05-06 00:46:57,266 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:46:57,266 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1355591423] [2021-05-06 00:46:57,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:46:57,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:46:57,354 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:46:57,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:46:57,360 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-05-06 00:46:57,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:46:57,369 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 00:46:57,369 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:46:57,369 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1355591423] [2021-05-06 00:46:57,369 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1355591423] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:46:57,369 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [270615489] [2021-05-06 00:46:57,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2021-05-06 00:46:57,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:46:57,420 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-06 00:46:57,421 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:46:57,491 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-06 00:46:57,491 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [270615489] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:46:57,491 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:46:57,491 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 11 [2021-05-06 00:46:57,492 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1611534609] [2021-05-06 00:46:57,492 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 00:46:57,492 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:46:57,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 00:46:57,493 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-05-06 00:46:57,493 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 3 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 00:46:58,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:46:58,005 INFO L93 Difference]: Finished difference Result 68 states and 82 transitions. [2021-05-06 00:46:58,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-06 00:46:58,007 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 3 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 23 [2021-05-06 00:46:58,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:46:58,008 INFO L225 Difference]: With dead ends: 68 [2021-05-06 00:46:58,008 INFO L226 Difference]: Without dead ends: 46 [2021-05-06 00:46:58,009 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 448.2ms TimeCoverageRelationStatistics Valid=134, Invalid=466, Unknown=0, NotChecked=0, Total=600 [2021-05-06 00:46:58,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-05-06 00:46:58,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 38. [2021-05-06 00:46:58,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 29 states have internal predecessors, (33), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 00:46:58,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 43 transitions. [2021-05-06 00:46:58,020 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 43 transitions. Word has length 23 [2021-05-06 00:46:58,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:46:58,020 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 43 transitions. [2021-05-06 00:46:58,020 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 3 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 00:46:58,020 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 43 transitions. [2021-05-06 00:46:58,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-06 00:46:58,021 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:46:58,021 INFO L523 BasicCegarLoop]: trace histogram [8, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:46:58,244 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:46:58,245 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:46:58,245 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:46:58,245 INFO L82 PathProgramCache]: Analyzing trace with hash -1701412060, now seen corresponding path program 2 times [2021-05-06 00:46:58,245 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:46:58,245 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1446380608] [2021-05-06 00:46:58,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:46:58,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:46:58,329 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:46:58,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:46:58,333 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-05-06 00:46:58,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:46:58,336 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2021-05-06 00:46:58,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:46:58,338 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 31 proven. 10 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-05-06 00:46:58,338 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:46:58,338 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1446380608] [2021-05-06 00:46:58,338 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1446380608] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:46:58,338 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1282612786] [2021-05-06 00:46:58,339 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2021-05-06 00:46:58,446 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 00:46:58,446 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:46:58,447 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-06 00:46:58,449 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:46:58,534 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 4 proven. 30 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-05-06 00:46:58,534 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1282612786] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:46:58,534 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:46:58,535 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 5] total 11 [2021-05-06 00:46:58,535 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1649573493] [2021-05-06 00:46:58,535 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 00:46:58,535 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:46:58,536 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 00:46:58,536 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2021-05-06 00:46:58,536 INFO L87 Difference]: Start difference. First operand 38 states and 43 transitions. Second operand has 11 states, 11 states have (on average 2.909090909090909) internal successors, (32), 10 states have internal predecessors, (32), 4 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 00:46:59,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:46:59,452 INFO L93 Difference]: Finished difference Result 89 states and 108 transitions. [2021-05-06 00:46:59,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-06 00:46:59,453 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.909090909090909) internal successors, (32), 10 states have internal predecessors, (32), 4 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 36 [2021-05-06 00:46:59,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:46:59,453 INFO L225 Difference]: With dead ends: 89 [2021-05-06 00:46:59,453 INFO L226 Difference]: Without dead ends: 58 [2021-05-06 00:46:59,454 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 247 ImplicationChecksByTransitivity, 717.6ms TimeCoverageRelationStatistics Valid=204, Invalid=918, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 00:46:59,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-05-06 00:46:59,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 49. [2021-05-06 00:46:59,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 38 states have (on average 1.1578947368421053) internal successors, (44), 39 states have internal predecessors, (44), 7 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 00:46:59,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 56 transitions. [2021-05-06 00:46:59,463 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 56 transitions. Word has length 36 [2021-05-06 00:46:59,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:46:59,463 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 56 transitions. [2021-05-06 00:46:59,463 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.909090909090909) internal successors, (32), 10 states have internal predecessors, (32), 4 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 00:46:59,464 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 56 transitions. [2021-05-06 00:46:59,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-06 00:46:59,465 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:46:59,465 INFO L523 BasicCegarLoop]: trace histogram [15, 4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:46:59,669 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:46:59,670 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:46:59,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:46:59,670 INFO L82 PathProgramCache]: Analyzing trace with hash -1216595262, now seen corresponding path program 3 times [2021-05-06 00:46:59,670 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:46:59,670 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1458779297] [2021-05-06 00:46:59,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:46:59,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:46:59,769 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:46:59,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:46:59,773 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2021-05-06 00:46:59,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:46:59,775 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-05-06 00:46:59,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:46:59,779 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-05-06 00:46:59,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:46:59,781 INFO L134 CoverageAnalysis]: Checked inductivity of 183 backedges. 81 proven. 15 refuted. 0 times theorem prover too weak. 87 trivial. 0 not checked. [2021-05-06 00:46:59,782 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:46:59,782 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1458779297] [2021-05-06 00:46:59,782 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1458779297] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:46:59,782 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1489950818] [2021-05-06 00:46:59,782 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 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 [2021-05-06 00:46:59,920 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-05-06 00:46:59,920 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:46:59,921 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-06 00:46:59,923 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:47:00,038 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:47:00,060 INFO L134 CoverageAnalysis]: Checked inductivity of 183 backedges. 91 proven. 15 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-06 00:47:00,060 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1489950818] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:00,060 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:47:00,060 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-06 00:47:00,062 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [198380397] [2021-05-06 00:47:00,063 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 00:47:00,063 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:47:00,063 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 00:47:00,063 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-05-06 00:47:00,063 INFO L87 Difference]: Start difference. First operand 49 states and 56 transitions. Second operand has 10 states, 10 states have (on average 3.1) internal successors, (31), 9 states have internal predecessors, (31), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 00:47:00,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:47:00,289 INFO L93 Difference]: Finished difference Result 95 states and 112 transitions. [2021-05-06 00:47:00,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 00:47:00,290 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 9 states have internal predecessors, (31), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 51 [2021-05-06 00:47:00,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:47:00,292 INFO L225 Difference]: With dead ends: 95 [2021-05-06 00:47:00,292 INFO L226 Difference]: Without dead ends: 53 [2021-05-06 00:47:00,295 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 57 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 232.1ms TimeCoverageRelationStatistics Valid=53, Invalid=187, Unknown=0, NotChecked=0, Total=240 [2021-05-06 00:47:00,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-06 00:47:00,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 52. [2021-05-06 00:47:00,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 41 states have (on average 1.146341463414634) internal successors, (47), 42 states have internal predecessors, (47), 7 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 00:47:00,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 59 transitions. [2021-05-06 00:47:00,313 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 59 transitions. Word has length 51 [2021-05-06 00:47:00,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:47:00,314 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 59 transitions. [2021-05-06 00:47:00,314 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 9 states have internal predecessors, (31), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 00:47:00,314 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 59 transitions. [2021-05-06 00:47:00,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-05-06 00:47:00,321 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:47:00,321 INFO L523 BasicCegarLoop]: trace histogram [18, 4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:47:00,529 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:47:00,529 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:47:00,530 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:47:00,530 INFO L82 PathProgramCache]: Analyzing trace with hash 243654054, now seen corresponding path program 4 times [2021-05-06 00:47:00,530 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:47:00,530 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2033940064] [2021-05-06 00:47:00,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:47:00,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:00,666 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:47:00,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:00,671 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-05-06 00:47:00,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:00,673 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-05-06 00:47:00,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:00,674 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2021-05-06 00:47:00,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:00,681 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 107 proven. 21 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-05-06 00:47:00,681 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:47:00,681 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2033940064] [2021-05-06 00:47:00,682 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2033940064] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:00,682 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [149431722] [2021-05-06 00:47:00,682 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 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 [2021-05-06 00:47:00,749 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 00:47:00,750 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:47:00,751 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-06 00:47:00,760 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:47:00,820 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:47:00,866 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 101 proven. 21 refuted. 0 times theorem prover too weak. 118 trivial. 0 not checked. [2021-05-06 00:47:00,866 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [149431722] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:00,867 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:47:00,867 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2021-05-06 00:47:00,867 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1287566776] [2021-05-06 00:47:00,867 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 00:47:00,867 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:47:00,868 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 00:47:00,868 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-06 00:47:00,868 INFO L87 Difference]: Start difference. First operand 52 states and 59 transitions. Second operand has 11 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 10 states have internal predecessors, (28), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 00:47:01,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:47:01,143 INFO L93 Difference]: Finished difference Result 101 states and 118 transitions. [2021-05-06 00:47:01,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 00:47:01,143 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 10 states have internal predecessors, (28), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 54 [2021-05-06 00:47:01,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:47:01,144 INFO L225 Difference]: With dead ends: 101 [2021-05-06 00:47:01,144 INFO L226 Difference]: Without dead ends: 56 [2021-05-06 00:47:01,145 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 62 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 244.2ms TimeCoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2021-05-06 00:47:01,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-05-06 00:47:01,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2021-05-06 00:47:01,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 44 states have (on average 1.1363636363636365) internal successors, (50), 45 states have internal predecessors, (50), 7 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 00:47:01,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 62 transitions. [2021-05-06 00:47:01,154 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 62 transitions. Word has length 54 [2021-05-06 00:47:01,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:47:01,154 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 62 transitions. [2021-05-06 00:47:01,154 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 10 states have internal predecessors, (28), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 00:47:01,154 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 62 transitions. [2021-05-06 00:47:01,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-06 00:47:01,155 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:47:01,155 INFO L523 BasicCegarLoop]: trace histogram [21, 4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:47:01,368 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:47:01,369 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:47:01,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:47:01,369 INFO L82 PathProgramCache]: Analyzing trace with hash 469900866, now seen corresponding path program 5 times [2021-05-06 00:47:01,369 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:47:01,369 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1931652940] [2021-05-06 00:47:01,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:47:01,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:01,523 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:47:01,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:01,526 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 00:47:01,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:01,528 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2021-05-06 00:47:01,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:01,530 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2021-05-06 00:47:01,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:01,531 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 137 proven. 28 refuted. 0 times theorem prover too weak. 141 trivial. 0 not checked. [2021-05-06 00:47:01,531 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:47:01,531 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1931652940] [2021-05-06 00:47:01,532 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1931652940] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:01,532 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [563530466] [2021-05-06 00:47:01,532 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:47:01,582 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-05-06 00:47:01,582 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:47:01,583 WARN L261 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-06 00:47:01,585 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:47:01,686 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:47:01,717 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 210 proven. 28 refuted. 0 times theorem prover too weak. 68 trivial. 0 not checked. [2021-05-06 00:47:01,717 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [563530466] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:01,717 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:47:01,718 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2021-05-06 00:47:01,718 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [753594078] [2021-05-06 00:47:01,718 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-06 00:47:01,718 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:47:01,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-06 00:47:01,718 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-06 00:47:01,719 INFO L87 Difference]: Start difference. First operand 55 states and 62 transitions. Second operand has 12 states, 12 states have (on average 2.75) internal successors, (33), 11 states have internal predecessors, (33), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 00:47:02,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:47:02,003 INFO L93 Difference]: Finished difference Result 107 states and 124 transitions. [2021-05-06 00:47:02,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 00:47:02,003 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.75) internal successors, (33), 11 states have internal predecessors, (33), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 57 [2021-05-06 00:47:02,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:47:02,004 INFO L225 Difference]: With dead ends: 107 [2021-05-06 00:47:02,004 INFO L226 Difference]: Without dead ends: 59 [2021-05-06 00:47:02,004 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 59 SyntacticMatches, 6 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 337.6ms TimeCoverageRelationStatistics Valid=69, Invalid=311, Unknown=0, NotChecked=0, Total=380 [2021-05-06 00:47:02,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-05-06 00:47:02,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 58. [2021-05-06 00:47:02,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 47 states have (on average 1.127659574468085) internal successors, (53), 48 states have internal predecessors, (53), 7 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 00:47:02,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 65 transitions. [2021-05-06 00:47:02,014 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 65 transitions. Word has length 57 [2021-05-06 00:47:02,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:47:02,014 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 65 transitions. [2021-05-06 00:47:02,014 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.75) internal successors, (33), 11 states have internal predecessors, (33), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 00:47:02,014 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 65 transitions. [2021-05-06 00:47:02,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-05-06 00:47:02,015 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:47:02,015 INFO L523 BasicCegarLoop]: trace histogram [24, 4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:47:02,228 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-05-06 00:47:02,229 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:47:02,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:47:02,229 INFO L82 PathProgramCache]: Analyzing trace with hash -578639834, now seen corresponding path program 6 times [2021-05-06 00:47:02,230 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:47:02,230 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1654235148] [2021-05-06 00:47:02,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:47:02,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:02,397 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:47:02,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:02,401 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-06 00:47:02,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:02,403 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2021-05-06 00:47:02,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:02,409 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49 [2021-05-06 00:47:02,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:02,411 INFO L134 CoverageAnalysis]: Checked inductivity of 381 backedges. 171 proven. 36 refuted. 0 times theorem prover too weak. 174 trivial. 0 not checked. [2021-05-06 00:47:02,411 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:47:02,411 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1654235148] [2021-05-06 00:47:02,411 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1654235148] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:02,411 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [767879530] [2021-05-06 00:47:02,411 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 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 [2021-05-06 00:47:02,697 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2021-05-06 00:47:02,697 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:47:02,698 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-06 00:47:02,700 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:47:02,739 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:47:02,787 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:47:02,819 INFO L134 CoverageAnalysis]: Checked inductivity of 381 backedges. 261 proven. 36 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-05-06 00:47:02,819 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [767879530] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:02,819 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:47:02,819 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2021-05-06 00:47:02,819 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1832969670] [2021-05-06 00:47:02,820 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 00:47:02,820 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:47:02,820 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 00:47:02,820 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-06 00:47:02,821 INFO L87 Difference]: Start difference. First operand 58 states and 65 transitions. Second operand has 13 states, 13 states have (on average 2.6153846153846154) internal successors, (34), 12 states have internal predecessors, (34), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 00:47:03,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:47:03,239 INFO L93 Difference]: Finished difference Result 113 states and 130 transitions. [2021-05-06 00:47:03,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 00:47:03,240 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.6153846153846154) internal successors, (34), 12 states have internal predecessors, (34), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 60 [2021-05-06 00:47:03,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:47:03,241 INFO L225 Difference]: With dead ends: 113 [2021-05-06 00:47:03,241 INFO L226 Difference]: Without dead ends: 62 [2021-05-06 00:47:03,241 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 66 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 394.9ms TimeCoverageRelationStatistics Valid=77, Invalid=385, Unknown=0, NotChecked=0, Total=462 [2021-05-06 00:47:03,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-05-06 00:47:03,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2021-05-06 00:47:03,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 50 states have (on average 1.12) internal successors, (56), 51 states have internal predecessors, (56), 7 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 00:47:03,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 68 transitions. [2021-05-06 00:47:03,252 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 68 transitions. Word has length 60 [2021-05-06 00:47:03,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:47:03,252 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 68 transitions. [2021-05-06 00:47:03,253 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.6153846153846154) internal successors, (34), 12 states have internal predecessors, (34), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 00:47:03,253 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 68 transitions. [2021-05-06 00:47:03,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-06 00:47:03,253 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:47:03,253 INFO L523 BasicCegarLoop]: trace histogram [27, 4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:47:03,461 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:47:03,461 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:47:03,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:47:03,461 INFO L82 PathProgramCache]: Analyzing trace with hash -1427676734, now seen corresponding path program 7 times [2021-05-06 00:47:03,462 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:47:03,462 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1528870509] [2021-05-06 00:47:03,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:47:03,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:03,656 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:47:03,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:03,660 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-06 00:47:03,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:03,664 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2021-05-06 00:47:03,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:03,665 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 52 [2021-05-06 00:47:03,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:03,667 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 209 proven. 45 refuted. 0 times theorem prover too weak. 211 trivial. 0 not checked. [2021-05-06 00:47:03,667 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:47:03,667 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1528870509] [2021-05-06 00:47:03,667 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1528870509] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:03,667 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [861187635] [2021-05-06 00:47:03,667 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 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 [2021-05-06 00:47:03,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:03,742 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-06 00:47:03,744 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:47:03,802 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:47:03,852 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 203 proven. 45 refuted. 0 times theorem prover too weak. 217 trivial. 0 not checked. [2021-05-06 00:47:03,853 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [861187635] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:03,853 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:47:03,853 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2021-05-06 00:47:03,853 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1676461886] [2021-05-06 00:47:03,853 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 00:47:03,854 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:47:03,854 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 00:47:03,854 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-06 00:47:03,854 INFO L87 Difference]: Start difference. First operand 61 states and 68 transitions. Second operand has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 13 states have internal predecessors, (31), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 00:47:04,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:47:04,298 INFO L93 Difference]: Finished difference Result 119 states and 136 transitions. [2021-05-06 00:47:04,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 00:47:04,298 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 13 states have internal predecessors, (31), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 63 [2021-05-06 00:47:04,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:47:04,299 INFO L225 Difference]: With dead ends: 119 [2021-05-06 00:47:04,299 INFO L226 Difference]: Without dead ends: 65 [2021-05-06 00:47:04,300 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 71 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 412.4ms TimeCoverageRelationStatistics Valid=85, Invalid=467, Unknown=0, NotChecked=0, Total=552 [2021-05-06 00:47:04,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-06 00:47:04,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 64. [2021-05-06 00:47:04,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 53 states have (on average 1.1132075471698113) internal successors, (59), 54 states have internal predecessors, (59), 7 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 00:47:04,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 71 transitions. [2021-05-06 00:47:04,309 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 71 transitions. Word has length 63 [2021-05-06 00:47:04,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:47:04,309 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 71 transitions. [2021-05-06 00:47:04,310 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 13 states have internal predecessors, (31), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 00:47:04,310 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 71 transitions. [2021-05-06 00:47:04,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-05-06 00:47:04,310 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:47:04,310 INFO L523 BasicCegarLoop]: trace histogram [30, 4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:47:04,533 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:47:04,533 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:47:04,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:47:04,534 INFO L82 PathProgramCache]: Analyzing trace with hash 402461350, now seen corresponding path program 8 times [2021-05-06 00:47:04,534 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:47:04,534 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1789170315] [2021-05-06 00:47:04,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:47:04,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:04,726 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:47:04,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:04,729 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-05-06 00:47:04,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:04,731 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-05-06 00:47:04,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:04,734 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55 [2021-05-06 00:47:04,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:04,735 INFO L134 CoverageAnalysis]: Checked inductivity of 558 backedges. 251 proven. 55 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2021-05-06 00:47:04,736 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:47:04,736 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1789170315] [2021-05-06 00:47:04,736 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1789170315] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:04,736 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1178955763] [2021-05-06 00:47:04,736 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 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 [2021-05-06 00:47:04,835 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 00:47:04,836 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:47:04,837 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-06 00:47:04,838 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:47:04,981 INFO L134 CoverageAnalysis]: Checked inductivity of 558 backedges. 6 proven. 375 refuted. 0 times theorem prover too weak. 177 trivial. 0 not checked. [2021-05-06 00:47:04,981 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1178955763] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:04,981 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:47:04,981 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 6] total 18 [2021-05-06 00:47:04,981 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1274872921] [2021-05-06 00:47:04,982 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 00:47:04,982 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:47:04,982 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 00:47:04,982 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=263, Unknown=0, NotChecked=0, Total=306 [2021-05-06 00:47:04,983 INFO L87 Difference]: Start difference. First operand 64 states and 71 transitions. Second operand has 18 states, 18 states have (on average 2.3333333333333335) internal successors, (42), 17 states have internal predecessors, (42), 5 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 00:47:07,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:47:07,322 INFO L93 Difference]: Finished difference Result 154 states and 178 transitions. [2021-05-06 00:47:07,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-05-06 00:47:07,322 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.3333333333333335) internal successors, (42), 17 states have internal predecessors, (42), 5 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 66 [2021-05-06 00:47:07,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:47:07,323 INFO L225 Difference]: With dead ends: 154 [2021-05-06 00:47:07,323 INFO L226 Difference]: Without dead ends: 97 [2021-05-06 00:47:07,325 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 72 SyntacticMatches, 1 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1683 ImplicationChecksByTransitivity, 1852.4ms TimeCoverageRelationStatistics Valid=551, Invalid=5301, Unknown=0, NotChecked=0, Total=5852 [2021-05-06 00:47:07,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2021-05-06 00:47:07,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 82. [2021-05-06 00:47:07,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 70 states have (on average 1.1) internal successors, (77), 71 states have internal predecessors, (77), 8 states have call successors, (8), 4 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-06 00:47:07,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 91 transitions. [2021-05-06 00:47:07,338 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 91 transitions. Word has length 66 [2021-05-06 00:47:07,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:47:07,338 INFO L480 AbstractCegarLoop]: Abstraction has 82 states and 91 transitions. [2021-05-06 00:47:07,338 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.3333333333333335) internal successors, (42), 17 states have internal predecessors, (42), 5 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 00:47:07,338 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 91 transitions. [2021-05-06 00:47:07,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-06 00:47:07,339 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:47:07,339 INFO L523 BasicCegarLoop]: trace histogram [44, 5, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:47:07,544 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-06 00:47:07,544 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:47:07,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:47:07,545 INFO L82 PathProgramCache]: Analyzing trace with hash 591428512, now seen corresponding path program 9 times [2021-05-06 00:47:07,545 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:47:07,545 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [974870108] [2021-05-06 00:47:07,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:47:07,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:07,735 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:47:07,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:07,743 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-05-06 00:47:07,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:07,753 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2021-05-06 00:47:07,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:07,754 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 58 [2021-05-06 00:47:07,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:07,757 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 77 [2021-05-06 00:47:07,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:07,759 INFO L134 CoverageAnalysis]: Checked inductivity of 1182 backedges. 444 proven. 66 refuted. 0 times theorem prover too weak. 672 trivial. 0 not checked. [2021-05-06 00:47:07,759 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:47:07,759 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [974870108] [2021-05-06 00:47:07,759 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [974870108] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:07,759 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [918429467] [2021-05-06 00:47:07,759 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 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 [2021-05-06 00:47:08,229 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-05-06 00:47:08,229 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:47:08,231 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 55 conjunts are in the unsatisfiable core [2021-05-06 00:47:08,233 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:47:08,305 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:47:08,308 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:47:08,519 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:47:08,532 INFO L134 CoverageAnalysis]: Checked inductivity of 1182 backedges. 352 proven. 444 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2021-05-06 00:47:08,532 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [918429467] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:08,532 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:47:08,532 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2021-05-06 00:47:08,532 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1895558673] [2021-05-06 00:47:08,533 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-06 00:47:08,533 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:47:08,533 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-06 00:47:08,533 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-05-06 00:47:08,533 INFO L87 Difference]: Start difference. First operand 82 states and 91 transitions. Second operand has 16 states, 16 states have (on average 2.375) internal successors, (38), 15 states have internal predecessors, (38), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 00:47:09,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:47:09,002 INFO L93 Difference]: Finished difference Result 162 states and 184 transitions. [2021-05-06 00:47:09,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 00:47:09,008 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.375) internal successors, (38), 15 states have internal predecessors, (38), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 88 [2021-05-06 00:47:09,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:47:09,008 INFO L225 Difference]: With dead ends: 162 [2021-05-06 00:47:09,008 INFO L226 Difference]: Without dead ends: 87 [2021-05-06 00:47:09,009 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 86 SyntacticMatches, 12 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 506.6ms TimeCoverageRelationStatistics Valid=101, Invalid=655, Unknown=0, NotChecked=0, Total=756 [2021-05-06 00:47:09,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-05-06 00:47:09,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 86. [2021-05-06 00:47:09,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 74 states have (on average 1.0945945945945945) internal successors, (81), 75 states have internal predecessors, (81), 8 states have call successors, (8), 4 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-06 00:47:09,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 95 transitions. [2021-05-06 00:47:09,022 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 95 transitions. Word has length 88 [2021-05-06 00:47:09,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:47:09,022 INFO L480 AbstractCegarLoop]: Abstraction has 86 states and 95 transitions. [2021-05-06 00:47:09,022 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.375) internal successors, (38), 15 states have internal predecessors, (38), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 00:47:09,022 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 95 transitions. [2021-05-06 00:47:09,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-05-06 00:47:09,023 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:47:09,023 INFO L523 BasicCegarLoop]: trace histogram [48, 5, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:47:09,228 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-06 00:47:09,228 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:47:09,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:47:09,229 INFO L82 PathProgramCache]: Analyzing trace with hash -946609112, now seen corresponding path program 10 times [2021-05-06 00:47:09,229 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:47:09,229 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1386408754] [2021-05-06 00:47:09,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:47:09,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:09,469 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:47:09,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:09,475 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-05-06 00:47:09,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:09,477 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-05-06 00:47:09,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:09,478 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 61 [2021-05-06 00:47:09,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:09,481 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 81 [2021-05-06 00:47:09,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:09,483 INFO L134 CoverageAnalysis]: Checked inductivity of 1380 backedges. 519 proven. 78 refuted. 0 times theorem prover too weak. 783 trivial. 0 not checked. [2021-05-06 00:47:09,483 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:47:09,484 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1386408754] [2021-05-06 00:47:09,484 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1386408754] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:09,484 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [688072776] [2021-05-06 00:47:09,484 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 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 [2021-05-06 00:47:09,564 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 00:47:09,565 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:47:09,566 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-06 00:47:09,568 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:47:09,848 INFO L134 CoverageAnalysis]: Checked inductivity of 1380 backedges. 8 proven. 1086 refuted. 0 times theorem prover too weak. 286 trivial. 0 not checked. [2021-05-06 00:47:09,848 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [688072776] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:09,848 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:47:09,848 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 12] total 26 [2021-05-06 00:47:09,848 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1372976968] [2021-05-06 00:47:09,849 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 00:47:09,849 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:47:09,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 00:47:09,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=574, Unknown=0, NotChecked=0, Total=650 [2021-05-06 00:47:09,849 INFO L87 Difference]: Start difference. First operand 86 states and 95 transitions. Second operand has 26 states, 26 states have (on average 2.0384615384615383) internal successors, (53), 25 states have internal predecessors, (53), 6 states have call successors, (9), 3 states have call predecessors, (9), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-06 00:47:12,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:47:12,934 INFO L93 Difference]: Finished difference Result 203 states and 232 transitions. [2021-05-06 00:47:12,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2021-05-06 00:47:12,935 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.0384615384615383) internal successors, (53), 25 states have internal predecessors, (53), 6 states have call successors, (9), 3 states have call predecessors, (9), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Word has length 92 [2021-05-06 00:47:12,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:47:12,936 INFO L225 Difference]: With dead ends: 203 [2021-05-06 00:47:12,936 INFO L226 Difference]: Without dead ends: 124 [2021-05-06 00:47:12,938 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3807 ImplicationChecksByTransitivity, 2702.7ms TimeCoverageRelationStatistics Valid=812, Invalid=10960, Unknown=0, NotChecked=0, Total=11772 [2021-05-06 00:47:12,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-05-06 00:47:12,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 107. [2021-05-06 00:47:12,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 94 states have (on average 1.0851063829787233) internal successors, (102), 95 states have internal predecessors, (102), 9 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 00:47:12,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 118 transitions. [2021-05-06 00:47:12,951 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 118 transitions. Word has length 92 [2021-05-06 00:47:12,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:47:12,952 INFO L480 AbstractCegarLoop]: Abstraction has 107 states and 118 transitions. [2021-05-06 00:47:12,952 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 2.0384615384615383) internal successors, (53), 25 states have internal predecessors, (53), 6 states have call successors, (9), 3 states have call predecessors, (9), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-06 00:47:12,952 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 118 transitions. [2021-05-06 00:47:12,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-05-06 00:47:12,953 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:47:12,953 INFO L523 BasicCegarLoop]: trace histogram [65, 6, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:47:13,160 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-06 00:47:13,160 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:47:13,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:47:13,161 INFO L82 PathProgramCache]: Analyzing trace with hash -707936382, now seen corresponding path program 11 times [2021-05-06 00:47:13,161 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:47:13,161 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1081942165] [2021-05-06 00:47:13,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:47:13,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:13,435 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:47:13,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:13,439 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2021-05-06 00:47:13,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:13,441 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2021-05-06 00:47:13,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:13,442 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2021-05-06 00:47:13,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:13,444 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 85 [2021-05-06 00:47:13,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:13,445 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 106 [2021-05-06 00:47:13,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:13,447 INFO L134 CoverageAnalysis]: Checked inductivity of 2500 backedges. 799 proven. 91 refuted. 0 times theorem prover too weak. 1610 trivial. 0 not checked. [2021-05-06 00:47:13,448 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:47:13,448 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1081942165] [2021-05-06 00:47:13,448 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1081942165] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:13,448 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1569905613] [2021-05-06 00:47:13,448 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 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 [2021-05-06 00:47:15,096 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2021-05-06 00:47:15,096 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:47:15,099 WARN L261 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 98 conjunts are in the unsatisfiable core [2021-05-06 00:47:15,104 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:47:15,284 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:47:15,373 INFO L134 CoverageAnalysis]: Checked inductivity of 2500 backedges. 1406 proven. 91 refuted. 0 times theorem prover too weak. 1003 trivial. 0 not checked. [2021-05-06 00:47:15,373 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1569905613] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:15,373 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:47:15,373 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2021-05-06 00:47:15,373 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [816198407] [2021-05-06 00:47:15,374 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 00:47:15,374 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:47:15,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 00:47:15,374 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2021-05-06 00:47:15,374 INFO L87 Difference]: Start difference. First operand 107 states and 118 transitions. Second operand has 18 states, 18 states have (on average 2.1666666666666665) internal successors, (39), 17 states have internal predecessors, (39), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 00:47:15,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:47:15,905 INFO L93 Difference]: Finished difference Result 213 states and 240 transitions. [2021-05-06 00:47:15,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-06 00:47:15,906 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.1666666666666665) internal successors, (39), 17 states have internal predecessors, (39), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 117 [2021-05-06 00:47:15,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:47:15,907 INFO L225 Difference]: With dead ends: 213 [2021-05-06 00:47:15,907 INFO L226 Difference]: Without dead ends: 113 [2021-05-06 00:47:15,907 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 117 SyntacticMatches, 12 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 621.4ms TimeCoverageRelationStatistics Valid=117, Invalid=875, Unknown=0, NotChecked=0, Total=992 [2021-05-06 00:47:15,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-05-06 00:47:15,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 112. [2021-05-06 00:47:15,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 99 states have (on average 1.0808080808080809) internal successors, (107), 100 states have internal predecessors, (107), 9 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 00:47:15,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 123 transitions. [2021-05-06 00:47:15,924 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 123 transitions. Word has length 117 [2021-05-06 00:47:15,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:47:15,924 INFO L480 AbstractCegarLoop]: Abstraction has 112 states and 123 transitions. [2021-05-06 00:47:15,924 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.1666666666666665) internal successors, (39), 17 states have internal predecessors, (39), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 00:47:15,924 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 123 transitions. [2021-05-06 00:47:15,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-05-06 00:47:15,925 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:47:15,925 INFO L523 BasicCegarLoop]: trace histogram [70, 6, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:47:16,130 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:47:16,131 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:47:16,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:47:16,131 INFO L82 PathProgramCache]: Analyzing trace with hash 329534762, now seen corresponding path program 12 times [2021-05-06 00:47:16,131 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:47:16,131 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [634795505] [2021-05-06 00:47:16,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:47:16,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:16,414 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:47:16,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:16,418 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-05-06 00:47:16,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:16,420 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2021-05-06 00:47:16,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:16,421 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 67 [2021-05-06 00:47:16,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:16,423 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 89 [2021-05-06 00:47:16,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:16,425 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 111 [2021-05-06 00:47:16,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:16,428 INFO L134 CoverageAnalysis]: Checked inductivity of 2860 backedges. 915 proven. 105 refuted. 0 times theorem prover too weak. 1840 trivial. 0 not checked. [2021-05-06 00:47:16,428 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:47:16,428 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [634795505] [2021-05-06 00:47:16,428 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [634795505] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:16,428 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [348182124] [2021-05-06 00:47:16,429 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 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 [2021-05-06 00:47:21,379 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 16 check-sat command(s) [2021-05-06 00:47:21,379 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:47:21,384 INFO L263 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 93 conjunts are in the unsatisfiable core [2021-05-06 00:47:21,386 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:47:21,408 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:47:21,413 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:47:21,608 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:47:21,681 INFO L134 CoverageAnalysis]: Checked inductivity of 2860 backedges. 1579 proven. 160 refuted. 0 times theorem prover too weak. 1121 trivial. 0 not checked. [2021-05-06 00:47:21,681 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [348182124] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:21,681 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:47:21,681 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2021-05-06 00:47:21,681 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [66176587] [2021-05-06 00:47:21,682 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-06 00:47:21,682 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:47:21,682 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-06 00:47:21,682 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2021-05-06 00:47:21,682 INFO L87 Difference]: Start difference. First operand 112 states and 123 transitions. Second operand has 19 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 18 states have internal predecessors, (40), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 00:47:22,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:47:22,304 INFO L93 Difference]: Finished difference Result 223 states and 250 transitions. [2021-05-06 00:47:22,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 00:47:22,304 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 18 states have internal predecessors, (40), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 122 [2021-05-06 00:47:22,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:47:22,305 INFO L225 Difference]: With dead ends: 223 [2021-05-06 00:47:22,305 INFO L226 Difference]: Without dead ends: 118 [2021-05-06 00:47:22,306 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 121 SyntacticMatches, 14 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 760.7ms TimeCoverageRelationStatistics Valid=125, Invalid=997, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 00:47:22,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2021-05-06 00:47:22,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 117. [2021-05-06 00:47:22,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 104 states have (on average 1.0769230769230769) internal successors, (112), 105 states have internal predecessors, (112), 9 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 00:47:22,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 128 transitions. [2021-05-06 00:47:22,323 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 128 transitions. Word has length 122 [2021-05-06 00:47:22,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:47:22,323 INFO L480 AbstractCegarLoop]: Abstraction has 117 states and 128 transitions. [2021-05-06 00:47:22,323 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 18 states have internal predecessors, (40), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 00:47:22,323 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 128 transitions. [2021-05-06 00:47:22,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-05-06 00:47:22,324 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:47:22,324 INFO L523 BasicCegarLoop]: trace histogram [75, 6, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:47:22,529 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:47:22,529 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:47:22,530 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:47:22,530 INFO L82 PathProgramCache]: Analyzing trace with hash 1607123586, now seen corresponding path program 13 times [2021-05-06 00:47:22,530 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:47:22,530 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [780206351] [2021-05-06 00:47:22,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:47:22,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:22,813 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:47:22,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:22,819 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-05-06 00:47:22,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:22,820 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 47 [2021-05-06 00:47:22,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:22,821 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 70 [2021-05-06 00:47:22,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:22,824 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 93 [2021-05-06 00:47:22,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:22,826 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 116 [2021-05-06 00:47:22,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:22,828 INFO L134 CoverageAnalysis]: Checked inductivity of 3245 backedges. 1039 proven. 120 refuted. 0 times theorem prover too weak. 2086 trivial. 0 not checked. [2021-05-06 00:47:22,828 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:47:22,828 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [780206351] [2021-05-06 00:47:22,828 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [780206351] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:22,828 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [759091898] [2021-05-06 00:47:22,828 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 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 [2021-05-06 00:47:22,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:22,929 INFO L263 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 33 conjunts are in the unsatisfiable core [2021-05-06 00:47:22,931 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:47:22,997 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:47:23,094 INFO L134 CoverageAnalysis]: Checked inductivity of 3245 backedges. 1029 proven. 120 refuted. 0 times theorem prover too weak. 2096 trivial. 0 not checked. [2021-05-06 00:47:23,094 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [759091898] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:23,094 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:47:23,094 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2021-05-06 00:47:23,095 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [176715835] [2021-05-06 00:47:23,095 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-06 00:47:23,095 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:47:23,095 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-06 00:47:23,095 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2021-05-06 00:47:23,096 INFO L87 Difference]: Start difference. First operand 117 states and 128 transitions. Second operand has 20 states, 20 states have (on average 1.85) internal successors, (37), 19 states have internal predecessors, (37), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 00:47:23,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:47:23,778 INFO L93 Difference]: Finished difference Result 233 states and 260 transitions. [2021-05-06 00:47:23,778 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-06 00:47:23,778 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.85) internal successors, (37), 19 states have internal predecessors, (37), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 127 [2021-05-06 00:47:23,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:47:23,779 INFO L225 Difference]: With dead ends: 233 [2021-05-06 00:47:23,779 INFO L226 Difference]: Without dead ends: 123 [2021-05-06 00:47:23,780 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 139 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 621.8ms TimeCoverageRelationStatistics Valid=133, Invalid=1127, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 00:47:23,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2021-05-06 00:47:23,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 122. [2021-05-06 00:47:23,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 109 states have (on average 1.073394495412844) internal successors, (117), 110 states have internal predecessors, (117), 9 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 00:47:23,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 133 transitions. [2021-05-06 00:47:23,796 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 133 transitions. Word has length 127 [2021-05-06 00:47:23,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:47:23,796 INFO L480 AbstractCegarLoop]: Abstraction has 122 states and 133 transitions. [2021-05-06 00:47:23,796 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 1.85) internal successors, (37), 19 states have internal predecessors, (37), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 00:47:23,796 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 133 transitions. [2021-05-06 00:47:23,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2021-05-06 00:47:23,797 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:47:23,797 INFO L523 BasicCegarLoop]: trace histogram [80, 6, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:47:24,012 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:47:24,013 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:47:24,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:47:24,013 INFO L82 PathProgramCache]: Analyzing trace with hash 1360675882, now seen corresponding path program 14 times [2021-05-06 00:47:24,013 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:47:24,013 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [936570486] [2021-05-06 00:47:24,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:47:24,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:24,321 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:47:24,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:24,324 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2021-05-06 00:47:24,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:24,326 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49 [2021-05-06 00:47:24,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:24,327 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 73 [2021-05-06 00:47:24,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:24,328 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 97 [2021-05-06 00:47:24,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:24,330 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 121 [2021-05-06 00:47:24,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:24,332 INFO L134 CoverageAnalysis]: Checked inductivity of 3655 backedges. 1171 proven. 136 refuted. 0 times theorem prover too weak. 2348 trivial. 0 not checked. [2021-05-06 00:47:24,332 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:47:24,332 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [936570486] [2021-05-06 00:47:24,332 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [936570486] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:24,332 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1672277169] [2021-05-06 00:47:24,332 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:47:24,471 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 00:47:24,471 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:47:24,472 INFO L263 TraceCheckSpWp]: Trace formula consists of 409 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-06 00:47:24,474 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:47:24,752 INFO L134 CoverageAnalysis]: Checked inductivity of 3655 backedges. 10 proven. 2925 refuted. 0 times theorem prover too weak. 720 trivial. 0 not checked. [2021-05-06 00:47:24,752 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1672277169] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:24,752 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:47:24,752 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 8] total 26 [2021-05-06 00:47:24,753 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1862878322] [2021-05-06 00:47:24,755 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 00:47:24,755 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:47:24,755 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 00:47:24,755 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=585, Unknown=0, NotChecked=0, Total=650 [2021-05-06 00:47:24,755 INFO L87 Difference]: Start difference. First operand 122 states and 133 transitions. Second operand has 26 states, 26 states have (on average 2.1538461538461537) internal successors, (56), 25 states have internal predecessors, (56), 7 states have call successors, (10), 3 states have call predecessors, (10), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 00:47:29,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:47:29,962 INFO L93 Difference]: Finished difference Result 284 states and 318 transitions. [2021-05-06 00:47:29,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 128 states. [2021-05-06 00:47:29,963 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.1538461538461537) internal successors, (56), 25 states have internal predecessors, (56), 7 states have call successors, (10), 3 states have call predecessors, (10), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Word has length 132 [2021-05-06 00:47:29,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:47:29,963 INFO L225 Difference]: With dead ends: 284 [2021-05-06 00:47:29,963 INFO L226 Difference]: Without dead ends: 169 [2021-05-06 00:47:29,967 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 140 SyntacticMatches, 1 SemanticMatches, 149 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7672 ImplicationChecksByTransitivity, 4217.1ms TimeCoverageRelationStatistics Valid=1191, Invalid=21459, Unknown=0, NotChecked=0, Total=22650 [2021-05-06 00:47:29,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2021-05-06 00:47:29,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 148. [2021-05-06 00:47:29,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 134 states have (on average 1.0671641791044777) internal successors, (143), 135 states have internal predecessors, (143), 10 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 00:47:29,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 161 transitions. [2021-05-06 00:47:29,988 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 161 transitions. Word has length 132 [2021-05-06 00:47:29,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:47:29,988 INFO L480 AbstractCegarLoop]: Abstraction has 148 states and 161 transitions. [2021-05-06 00:47:29,988 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 2.1538461538461537) internal successors, (56), 25 states have internal predecessors, (56), 7 states have call successors, (10), 3 states have call predecessors, (10), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 00:47:29,988 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 161 transitions. [2021-05-06 00:47:29,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 163 [2021-05-06 00:47:29,989 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:47:29,989 INFO L523 BasicCegarLoop]: trace histogram [102, 7, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:47:30,193 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-05-06 00:47:30,194 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:47:30,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:47:30,194 INFO L82 PathProgramCache]: Analyzing trace with hash 305127648, now seen corresponding path program 15 times [2021-05-06 00:47:30,194 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:47:30,194 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1478473538] [2021-05-06 00:47:30,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:47:30,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:30,533 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:47:30,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:30,536 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2021-05-06 00:47:30,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:30,537 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2021-05-06 00:47:30,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:30,538 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 76 [2021-05-06 00:47:30,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:30,543 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 101 [2021-05-06 00:47:30,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:30,544 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 126 [2021-05-06 00:47:30,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:30,545 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 151 [2021-05-06 00:47:30,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:30,548 INFO L134 CoverageAnalysis]: Checked inductivity of 5901 backedges. 1638 proven. 153 refuted. 0 times theorem prover too weak. 4110 trivial. 0 not checked. [2021-05-06 00:47:30,548 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:47:30,548 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1478473538] [2021-05-06 00:47:30,548 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1478473538] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:30,549 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [637233615] [2021-05-06 00:47:30,549 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 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 [2021-05-06 00:47:31,544 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2021-05-06 00:47:31,544 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:47:31,547 INFO L263 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 46 conjunts are in the unsatisfiable core [2021-05-06 00:47:31,548 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:47:31,916 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:47:31,931 INFO L134 CoverageAnalysis]: Checked inductivity of 5901 backedges. 1666 proven. 153 refuted. 0 times theorem prover too weak. 4082 trivial. 0 not checked. [2021-05-06 00:47:31,931 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [637233615] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:31,931 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:47:31,932 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2021-05-06 00:47:31,932 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1589651529] [2021-05-06 00:47:31,932 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 00:47:31,932 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:47:31,932 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 00:47:31,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2021-05-06 00:47:31,933 INFO L87 Difference]: Start difference. First operand 148 states and 161 transitions. Second operand has 22 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 21 states have internal predecessors, (43), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 00:47:32,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:47:32,737 INFO L93 Difference]: Finished difference Result 296 states and 328 transitions. [2021-05-06 00:47:32,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 00:47:32,739 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 21 states have internal predecessors, (43), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 162 [2021-05-06 00:47:32,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:47:32,740 INFO L225 Difference]: With dead ends: 296 [2021-05-06 00:47:32,740 INFO L226 Difference]: Without dead ends: 155 [2021-05-06 00:47:32,741 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 166 SyntacticMatches, 10 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 175 ImplicationChecksByTransitivity, 927.2ms TimeCoverageRelationStatistics Valid=149, Invalid=1411, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 00:47:32,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2021-05-06 00:47:32,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 154. [2021-05-06 00:47:32,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 154 states, 140 states have (on average 1.0642857142857143) internal successors, (149), 141 states have internal predecessors, (149), 10 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 00:47:32,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 167 transitions. [2021-05-06 00:47:32,760 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 167 transitions. Word has length 162 [2021-05-06 00:47:32,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:47:32,760 INFO L480 AbstractCegarLoop]: Abstraction has 154 states and 167 transitions. [2021-05-06 00:47:32,760 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 21 states have internal predecessors, (43), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 00:47:32,761 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 167 transitions. [2021-05-06 00:47:32,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2021-05-06 00:47:32,761 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:47:32,761 INFO L523 BasicCegarLoop]: trace histogram [108, 7, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:47:32,966 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-05-06 00:47:32,966 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:47:32,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:47:32,967 INFO L82 PathProgramCache]: Analyzing trace with hash -423191380, now seen corresponding path program 16 times [2021-05-06 00:47:32,967 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:47:32,967 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1354191898] [2021-05-06 00:47:32,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:47:33,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:33,318 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:47:33,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:33,321 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-05-06 00:47:33,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:33,323 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 53 [2021-05-06 00:47:33,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:33,324 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 79 [2021-05-06 00:47:33,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:33,326 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 105 [2021-05-06 00:47:33,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:33,329 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 131 [2021-05-06 00:47:33,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:33,330 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 157 [2021-05-06 00:47:33,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:33,334 INFO L134 CoverageAnalysis]: Checked inductivity of 6564 backedges. 1823 proven. 171 refuted. 0 times theorem prover too weak. 4570 trivial. 0 not checked. [2021-05-06 00:47:33,334 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:47:33,334 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1354191898] [2021-05-06 00:47:33,334 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1354191898] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:33,334 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1065357188] [2021-05-06 00:47:33,334 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 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 [2021-05-06 00:47:33,453 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 00:47:33,453 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:47:33,454 INFO L263 TraceCheckSpWp]: Trace formula consists of 508 conjuncts, 39 conjunts are in the unsatisfiable core [2021-05-06 00:47:33,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:47:33,531 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:47:33,670 INFO L134 CoverageAnalysis]: Checked inductivity of 6564 backedges. 1811 proven. 171 refuted. 0 times theorem prover too weak. 4582 trivial. 0 not checked. [2021-05-06 00:47:33,671 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1065357188] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:33,671 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:47:33,671 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2021-05-06 00:47:33,671 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [921325968] [2021-05-06 00:47:33,671 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-06 00:47:33,671 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:47:33,672 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-06 00:47:33,672 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2021-05-06 00:47:33,672 INFO L87 Difference]: Start difference. First operand 154 states and 167 transitions. Second operand has 23 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 22 states have internal predecessors, (40), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 00:47:34,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:47:34,404 INFO L93 Difference]: Finished difference Result 308 states and 340 transitions. [2021-05-06 00:47:34,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-06 00:47:34,404 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 22 states have internal predecessors, (40), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 168 [2021-05-06 00:47:34,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:47:34,405 INFO L225 Difference]: With dead ends: 308 [2021-05-06 00:47:34,405 INFO L226 Difference]: Without dead ends: 161 [2021-05-06 00:47:34,406 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 182 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 175 ImplicationChecksByTransitivity, 788.0ms TimeCoverageRelationStatistics Valid=157, Invalid=1565, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 00:47:34,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2021-05-06 00:47:34,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 160. [2021-05-06 00:47:34,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160 states, 146 states have (on average 1.0616438356164384) internal successors, (155), 147 states have internal predecessors, (155), 10 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 00:47:34,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 173 transitions. [2021-05-06 00:47:34,430 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 173 transitions. Word has length 168 [2021-05-06 00:47:34,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:47:34,430 INFO L480 AbstractCegarLoop]: Abstraction has 160 states and 173 transitions. [2021-05-06 00:47:34,430 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 22 states have internal predecessors, (40), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 00:47:34,430 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 173 transitions. [2021-05-06 00:47:34,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2021-05-06 00:47:34,431 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:47:34,431 INFO L523 BasicCegarLoop]: trace histogram [114, 7, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:47:34,648 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-06 00:47:34,649 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:47:34,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:47:34,649 INFO L82 PathProgramCache]: Analyzing trace with hash 1389986400, now seen corresponding path program 17 times [2021-05-06 00:47:34,649 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:47:34,649 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [159962678] [2021-05-06 00:47:34,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:47:34,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:35,011 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:47:35,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:35,021 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2021-05-06 00:47:35,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:35,023 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55 [2021-05-06 00:47:35,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:35,024 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 82 [2021-05-06 00:47:35,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:35,026 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 109 [2021-05-06 00:47:35,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:35,027 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 136 [2021-05-06 00:47:35,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:35,028 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 163 [2021-05-06 00:47:35,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:35,031 INFO L134 CoverageAnalysis]: Checked inductivity of 7263 backedges. 2018 proven. 190 refuted. 0 times theorem prover too weak. 5055 trivial. 0 not checked. [2021-05-06 00:47:35,031 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:47:35,031 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [159962678] [2021-05-06 00:47:35,031 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [159962678] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:35,031 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [65962903] [2021-05-06 00:47:35,031 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:47:51,744 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 11 check-sat command(s) [2021-05-06 00:47:51,745 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:47:51,755 WARN L261 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 130 conjunts are in the unsatisfiable core [2021-05-06 00:47:51,757 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:47:52,043 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:47:52,156 INFO L134 CoverageAnalysis]: Checked inductivity of 7263 backedges. 3642 proven. 190 refuted. 0 times theorem prover too weak. 3431 trivial. 0 not checked. [2021-05-06 00:47:52,156 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [65962903] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:52,156 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:47:52,156 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 24 [2021-05-06 00:47:52,156 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1194501131] [2021-05-06 00:47:52,157 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-06 00:47:52,157 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:47:52,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-06 00:47:52,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2021-05-06 00:47:52,157 INFO L87 Difference]: Start difference. First operand 160 states and 173 transitions. Second operand has 24 states, 24 states have (on average 1.875) internal successors, (45), 23 states have internal predecessors, (45), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 00:47:52,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:47:52,991 INFO L93 Difference]: Finished difference Result 320 states and 352 transitions. [2021-05-06 00:47:52,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-06 00:47:52,991 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.875) internal successors, (45), 23 states have internal predecessors, (45), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 174 [2021-05-06 00:47:52,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:47:52,992 INFO L225 Difference]: With dead ends: 320 [2021-05-06 00:47:52,992 INFO L226 Difference]: Without dead ends: 167 [2021-05-06 00:47:52,993 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 171 SyntacticMatches, 17 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 226 ImplicationChecksByTransitivity, 1017.3ms TimeCoverageRelationStatistics Valid=165, Invalid=1727, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 00:47:52,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2021-05-06 00:47:53,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 166. [2021-05-06 00:47:53,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 152 states have (on average 1.0592105263157894) internal successors, (161), 153 states have internal predecessors, (161), 10 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 00:47:53,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 179 transitions. [2021-05-06 00:47:53,021 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 179 transitions. Word has length 174 [2021-05-06 00:47:53,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:47:53,021 INFO L480 AbstractCegarLoop]: Abstraction has 166 states and 179 transitions. [2021-05-06 00:47:53,021 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.875) internal successors, (45), 23 states have internal predecessors, (45), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 00:47:53,021 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 179 transitions. [2021-05-06 00:47:53,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 181 [2021-05-06 00:47:53,022 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:47:53,022 INFO L523 BasicCegarLoop]: trace histogram [120, 7, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:47:53,229 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-05-06 00:47:53,229 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:47:53,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:47:53,229 INFO L82 PathProgramCache]: Analyzing trace with hash 606000428, now seen corresponding path program 18 times [2021-05-06 00:47:53,229 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:47:53,229 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1193794685] [2021-05-06 00:47:53,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:47:53,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:53,596 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:47:53,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:53,609 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-05-06 00:47:53,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:53,611 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 57 [2021-05-06 00:47:53,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:53,612 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 85 [2021-05-06 00:47:53,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:53,613 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 113 [2021-05-06 00:47:53,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:53,614 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 141 [2021-05-06 00:47:53,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:53,615 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 169 [2021-05-06 00:47:53,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:47:53,617 INFO L134 CoverageAnalysis]: Checked inductivity of 7998 backedges. 2223 proven. 210 refuted. 0 times theorem prover too weak. 5565 trivial. 0 not checked. [2021-05-06 00:47:53,617 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:47:53,617 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1193794685] [2021-05-06 00:47:53,617 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1193794685] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:47:53,617 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2083909256] [2021-05-06 00:47:53,617 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 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 [2021-05-06 00:48:55,886 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 22 check-sat command(s) [2021-05-06 00:48:55,886 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:48:55,906 INFO L263 TraceCheckSpWp]: Trace formula consists of 400 conjuncts, 170 conjunts are in the unsatisfiable core [2021-05-06 00:48:55,909 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:48:55,932 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:48:55,934 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:48:56,191 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:48:56,301 INFO L134 CoverageAnalysis]: Checked inductivity of 7998 backedges. 3927 proven. 364 refuted. 0 times theorem prover too weak. 3707 trivial. 0 not checked. [2021-05-06 00:48:56,301 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2083909256] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:48:56,301 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:48:56,301 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2021-05-06 00:48:56,302 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [515622597] [2021-05-06 00:48:56,302 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 00:48:56,302 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:48:56,302 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 00:48:56,302 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2021-05-06 00:48:56,303 INFO L87 Difference]: Start difference. First operand 166 states and 179 transitions. Second operand has 25 states, 25 states have (on average 1.84) internal successors, (46), 24 states have internal predecessors, (46), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 00:48:57,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:48:57,162 INFO L93 Difference]: Finished difference Result 332 states and 364 transitions. [2021-05-06 00:48:57,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-06 00:48:57,162 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.84) internal successors, (46), 24 states have internal predecessors, (46), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 180 [2021-05-06 00:48:57,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:48:57,163 INFO L225 Difference]: With dead ends: 332 [2021-05-06 00:48:57,163 INFO L226 Difference]: Without dead ends: 173 [2021-05-06 00:48:57,164 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 179 SyntacticMatches, 16 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 244 ImplicationChecksByTransitivity, 1036.7ms TimeCoverageRelationStatistics Valid=173, Invalid=1897, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 00:48:57,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2021-05-06 00:48:57,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 172. [2021-05-06 00:48:57,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 172 states, 158 states have (on average 1.0569620253164558) internal successors, (167), 159 states have internal predecessors, (167), 10 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 00:48:57,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 185 transitions. [2021-05-06 00:48:57,185 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 185 transitions. Word has length 180 [2021-05-06 00:48:57,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:48:57,186 INFO L480 AbstractCegarLoop]: Abstraction has 172 states and 185 transitions. [2021-05-06 00:48:57,186 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 1.84) internal successors, (46), 24 states have internal predecessors, (46), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 00:48:57,186 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 185 transitions. [2021-05-06 00:48:57,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2021-05-06 00:48:57,187 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:48:57,187 INFO L523 BasicCegarLoop]: trace histogram [126, 7, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:48:57,399 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-05-06 00:48:57,399 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:48:57,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:48:57,400 INFO L82 PathProgramCache]: Analyzing trace with hash -1340783648, now seen corresponding path program 19 times [2021-05-06 00:48:57,400 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:48:57,400 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [359111405] [2021-05-06 00:48:57,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:48:57,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:57,814 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:48:57,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:57,825 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 30 [2021-05-06 00:48:57,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:57,826 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-06 00:48:57,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:57,828 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 88 [2021-05-06 00:48:57,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:57,829 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 117 [2021-05-06 00:48:57,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:57,831 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 146 [2021-05-06 00:48:57,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:57,832 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 175 [2021-05-06 00:48:57,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:57,835 INFO L134 CoverageAnalysis]: Checked inductivity of 8769 backedges. 2438 proven. 231 refuted. 0 times theorem prover too weak. 6100 trivial. 0 not checked. [2021-05-06 00:48:57,835 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:48:57,835 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [359111405] [2021-05-06 00:48:57,835 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [359111405] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:48:57,835 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1272871293] [2021-05-06 00:48:57,835 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 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 [2021-05-06 00:48:57,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:57,954 INFO L263 TraceCheckSpWp]: Trace formula consists of 562 conjuncts, 45 conjunts are in the unsatisfiable core [2021-05-06 00:48:57,957 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:48:58,038 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:48:58,188 INFO L134 CoverageAnalysis]: Checked inductivity of 8769 backedges. 2426 proven. 231 refuted. 0 times theorem prover too weak. 6112 trivial. 0 not checked. [2021-05-06 00:48:58,189 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1272871293] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:48:58,189 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:48:58,189 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 26 [2021-05-06 00:48:58,189 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1337823933] [2021-05-06 00:48:58,189 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 00:48:58,189 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:48:58,190 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 00:48:58,191 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2021-05-06 00:48:58,191 INFO L87 Difference]: Start difference. First operand 172 states and 185 transitions. Second operand has 26 states, 26 states have (on average 1.6538461538461537) internal successors, (43), 25 states have internal predecessors, (43), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 00:48:59,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:48:59,203 INFO L93 Difference]: Finished difference Result 344 states and 376 transitions. [2021-05-06 00:48:59,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-06 00:48:59,203 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.6538461538461537) internal successors, (43), 25 states have internal predecessors, (43), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 186 [2021-05-06 00:48:59,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:48:59,204 INFO L225 Difference]: With dead ends: 344 [2021-05-06 00:48:59,204 INFO L226 Difference]: Without dead ends: 179 [2021-05-06 00:48:59,205 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 200 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 235 ImplicationChecksByTransitivity, 944.1ms TimeCoverageRelationStatistics Valid=181, Invalid=2075, Unknown=0, NotChecked=0, Total=2256 [2021-05-06 00:48:59,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2021-05-06 00:48:59,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 178. [2021-05-06 00:48:59,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178 states, 164 states have (on average 1.0548780487804879) internal successors, (173), 165 states have internal predecessors, (173), 10 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 00:48:59,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 191 transitions. [2021-05-06 00:48:59,224 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 191 transitions. Word has length 186 [2021-05-06 00:48:59,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:48:59,224 INFO L480 AbstractCegarLoop]: Abstraction has 178 states and 191 transitions. [2021-05-06 00:48:59,224 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 1.6538461538461537) internal successors, (43), 25 states have internal predecessors, (43), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 00:48:59,224 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 191 transitions. [2021-05-06 00:48:59,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 193 [2021-05-06 00:48:59,225 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:48:59,225 INFO L523 BasicCegarLoop]: trace histogram [132, 7, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:48:59,440 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:48:59,441 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:48:59,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:48:59,441 INFO L82 PathProgramCache]: Analyzing trace with hash -1978798676, now seen corresponding path program 20 times [2021-05-06 00:48:59,441 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:48:59,441 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1350583961] [2021-05-06 00:48:59,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:48:59,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:59,880 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:48:59,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:59,889 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2021-05-06 00:48:59,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:59,891 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 61 [2021-05-06 00:48:59,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:59,892 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 91 [2021-05-06 00:48:59,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:59,901 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 121 [2021-05-06 00:48:59,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:59,903 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 151 [2021-05-06 00:48:59,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:59,904 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 181 [2021-05-06 00:48:59,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:48:59,906 INFO L134 CoverageAnalysis]: Checked inductivity of 9576 backedges. 2663 proven. 253 refuted. 0 times theorem prover too weak. 6660 trivial. 0 not checked. [2021-05-06 00:48:59,906 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:48:59,907 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1350583961] [2021-05-06 00:48:59,907 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1350583961] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:48:59,907 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1141486848] [2021-05-06 00:48:59,907 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 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 [2021-05-06 00:49:00,069 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 00:49:00,069 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:49:00,071 INFO L263 TraceCheckSpWp]: Trace formula consists of 580 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-06 00:49:00,073 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:49:00,437 INFO L134 CoverageAnalysis]: Checked inductivity of 9576 backedges. 12 proven. 7986 refuted. 0 times theorem prover too weak. 1578 trivial. 0 not checked. [2021-05-06 00:49:00,437 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1141486848] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:49:00,437 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:49:00,438 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 9] total 33 [2021-05-06 00:49:00,438 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1233059620] [2021-05-06 00:49:00,438 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 00:49:00,438 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:49:00,438 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 00:49:00,439 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=971, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 00:49:00,439 INFO L87 Difference]: Start difference. First operand 178 states and 191 transitions. Second operand has 33 states, 33 states have (on average 2.0) internal successors, (66), 32 states have internal predecessors, (66), 8 states have call successors, (11), 3 states have call predecessors, (11), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 00:49:09,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:49:09,239 INFO L93 Difference]: Finished difference Result 409 states and 448 transitions. [2021-05-06 00:49:09,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 194 states. [2021-05-06 00:49:09,239 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.0) internal successors, (66), 32 states have internal predecessors, (66), 8 states have call successors, (11), 3 states have call predecessors, (11), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Word has length 192 [2021-05-06 00:49:09,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:49:09,240 INFO L225 Difference]: With dead ends: 409 [2021-05-06 00:49:09,240 INFO L226 Difference]: Without dead ends: 238 [2021-05-06 00:49:09,244 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 424 GetRequests, 201 SyntacticMatches, 1 SemanticMatches, 222 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18015 ImplicationChecksByTransitivity, 6967.6ms TimeCoverageRelationStatistics Valid=1838, Invalid=48114, Unknown=0, NotChecked=0, Total=49952 [2021-05-06 00:49:09,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 238 states. [2021-05-06 00:49:09,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 238 to 211. [2021-05-06 00:49:09,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 211 states, 196 states have (on average 1.0510204081632653) internal successors, (206), 197 states have internal predecessors, (206), 11 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-06 00:49:09,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 226 transitions. [2021-05-06 00:49:09,276 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 226 transitions. Word has length 192 [2021-05-06 00:49:09,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:49:09,277 INFO L480 AbstractCegarLoop]: Abstraction has 211 states and 226 transitions. [2021-05-06 00:49:09,277 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 2.0) internal successors, (66), 32 states have internal predecessors, (66), 8 states have call successors, (11), 3 states have call predecessors, (11), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 00:49:09,277 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 226 transitions. [2021-05-06 00:49:09,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 230 [2021-05-06 00:49:09,278 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:49:09,278 INFO L523 BasicCegarLoop]: trace histogram [161, 8, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:49:09,483 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-05-06 00:49:09,484 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:49:09,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:49:09,484 INFO L82 PathProgramCache]: Analyzing trace with hash -627182910, now seen corresponding path program 21 times [2021-05-06 00:49:09,484 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:49:09,484 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [303663684] [2021-05-06 00:49:09,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:49:09,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:49:10,107 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:49:10,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:49:10,117 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 32 [2021-05-06 00:49:10,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:49:10,119 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 63 [2021-05-06 00:49:10,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:49:10,120 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 94 [2021-05-06 00:49:10,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:49:10,124 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 125 [2021-05-06 00:49:10,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:49:10,125 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 156 [2021-05-06 00:49:10,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:49:10,126 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 187 [2021-05-06 00:49:10,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:49:10,127 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 218 [2021-05-06 00:49:10,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:49:10,130 INFO L134 CoverageAnalysis]: Checked inductivity of 14196 backedges. 3477 proven. 276 refuted. 0 times theorem prover too weak. 10443 trivial. 0 not checked. [2021-05-06 00:49:10,130 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:49:10,130 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [303663684] [2021-05-06 00:49:10,130 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [303663684] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:49:10,130 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [461339276] [2021-05-06 00:49:10,131 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2021-05-06 00:49:11,975 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 26 check-sat command(s) [2021-05-06 00:49:11,975 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:49:11,978 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 103 conjunts are in the unsatisfiable core [2021-05-06 00:49:11,980 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:49:12,079 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:49:12,081 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:49:12,659 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:49:12,672 INFO L134 CoverageAnalysis]: Checked inductivity of 14196 backedges. 3127 proven. 2812 refuted. 0 times theorem prover too weak. 8257 trivial. 0 not checked. [2021-05-06 00:49:12,672 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [461339276] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:49:12,672 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:49:12,672 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 28 [2021-05-06 00:49:12,672 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [333935572] [2021-05-06 00:49:12,672 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-06 00:49:12,672 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:49:12,673 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-06 00:49:12,673 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2021-05-06 00:49:12,673 INFO L87 Difference]: Start difference. First operand 211 states and 226 transitions. Second operand has 28 states, 28 states have (on average 1.7857142857142858) internal successors, (50), 27 states have internal predecessors, (50), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 00:49:13,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:49:13,769 INFO L93 Difference]: Finished difference Result 423 states and 460 transitions. [2021-05-06 00:49:13,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-06 00:49:13,770 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.7857142857142858) internal successors, (50), 27 states have internal predecessors, (50), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 229 [2021-05-06 00:49:13,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:49:13,771 INFO L225 Difference]: With dead ends: 423 [2021-05-06 00:49:13,771 INFO L226 Difference]: Without dead ends: 219 [2021-05-06 00:49:13,772 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 295 GetRequests, 223 SyntacticMatches, 22 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 322 ImplicationChecksByTransitivity, 1539.8ms TimeCoverageRelationStatistics Valid=197, Invalid=2455, Unknown=0, NotChecked=0, Total=2652 [2021-05-06 00:49:13,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2021-05-06 00:49:13,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 218. [2021-05-06 00:49:13,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 218 states, 203 states have (on average 1.0492610837438423) internal successors, (213), 204 states have internal predecessors, (213), 11 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-06 00:49:13,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218 states to 218 states and 233 transitions. [2021-05-06 00:49:13,805 INFO L78 Accepts]: Start accepts. Automaton has 218 states and 233 transitions. Word has length 229 [2021-05-06 00:49:13,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:49:13,805 INFO L480 AbstractCegarLoop]: Abstraction has 218 states and 233 transitions. [2021-05-06 00:49:13,806 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 1.7857142857142858) internal successors, (50), 27 states have internal predecessors, (50), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 00:49:13,806 INFO L276 IsEmpty]: Start isEmpty. Operand 218 states and 233 transitions. [2021-05-06 00:49:13,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 237 [2021-05-06 00:49:13,807 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:49:13,807 INFO L523 BasicCegarLoop]: trace histogram [168, 8, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:49:14,012 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:49:14,012 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:49:14,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:49:14,012 INFO L82 PathProgramCache]: Analyzing trace with hash 200123438, now seen corresponding path program 22 times [2021-05-06 00:49:14,012 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:49:14,012 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [184408210] [2021-05-06 00:49:14,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:49:14,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:49:14,534 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:49:14,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:49:14,537 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2021-05-06 00:49:14,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:49:14,538 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 65 [2021-05-06 00:49:14,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:49:14,539 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 97 [2021-05-06 00:49:14,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:49:14,540 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 129 [2021-05-06 00:49:14,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:49:14,541 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 161 [2021-05-06 00:49:14,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:49:14,542 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 193 [2021-05-06 00:49:14,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:49:14,543 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 225 [2021-05-06 00:49:14,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:49:14,545 INFO L134 CoverageAnalysis]: Checked inductivity of 15393 backedges. 3771 proven. 300 refuted. 0 times theorem prover too weak. 11322 trivial. 0 not checked. [2021-05-06 00:49:14,545 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:49:14,545 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [184408210] [2021-05-06 00:49:14,546 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [184408210] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:49:14,546 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [184400615] [2021-05-06 00:49:14,546 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 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 [2021-05-06 00:49:14,699 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 00:49:14,700 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:49:14,703 INFO L263 TraceCheckSpWp]: Trace formula consists of 703 conjuncts, 51 conjunts are in the unsatisfiable core [2021-05-06 00:49:14,705 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:49:14,787 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:49:14,970 INFO L134 CoverageAnalysis]: Checked inductivity of 15393 backedges. 3757 proven. 300 refuted. 0 times theorem prover too weak. 11336 trivial. 0 not checked. [2021-05-06 00:49:14,970 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [184400615] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:49:14,970 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:49:14,970 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27] total 29 [2021-05-06 00:49:14,970 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1684321108] [2021-05-06 00:49:14,970 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-06 00:49:14,971 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:49:14,971 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-06 00:49:14,971 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2021-05-06 00:49:14,971 INFO L87 Difference]: Start difference. First operand 218 states and 233 transitions. Second operand has 29 states, 29 states have (on average 1.5862068965517242) internal successors, (46), 28 states have internal predecessors, (46), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 00:49:16,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:49:16,130 INFO L93 Difference]: Finished difference Result 437 states and 474 transitions. [2021-05-06 00:49:16,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-06 00:49:16,131 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.5862068965517242) internal successors, (46), 28 states have internal predecessors, (46), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 236 [2021-05-06 00:49:16,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:49:16,131 INFO L225 Difference]: With dead ends: 437 [2021-05-06 00:49:16,131 INFO L226 Difference]: Without dead ends: 226 [2021-05-06 00:49:16,132 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 305 GetRequests, 252 SyntacticMatches, 1 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 304 ImplicationChecksByTransitivity, 1152.7ms TimeCoverageRelationStatistics Valid=205, Invalid=2657, Unknown=0, NotChecked=0, Total=2862 [2021-05-06 00:49:16,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2021-05-06 00:49:16,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 225. [2021-05-06 00:49:16,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 225 states, 210 states have (on average 1.0476190476190477) internal successors, (220), 211 states have internal predecessors, (220), 11 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-06 00:49:16,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 240 transitions. [2021-05-06 00:49:16,163 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 240 transitions. Word has length 236 [2021-05-06 00:49:16,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:49:16,163 INFO L480 AbstractCegarLoop]: Abstraction has 225 states and 240 transitions. [2021-05-06 00:49:16,163 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 1.5862068965517242) internal successors, (46), 28 states have internal predecessors, (46), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 00:49:16,163 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 240 transitions. [2021-05-06 00:49:16,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 244 [2021-05-06 00:49:16,164 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:49:16,164 INFO L523 BasicCegarLoop]: trace histogram [175, 8, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:49:16,380 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-06 00:49:16,381 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:49:16,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:49:16,381 INFO L82 PathProgramCache]: Analyzing trace with hash -76532414, now seen corresponding path program 23 times [2021-05-06 00:49:16,381 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:49:16,381 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1635267281] [2021-05-06 00:49:16,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:49:16,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:49:16,950 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:49:16,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:49:16,961 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 34 [2021-05-06 00:49:16,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:49:16,963 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 67 [2021-05-06 00:49:16,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:49:16,964 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 100 [2021-05-06 00:49:16,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:49:16,965 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 133 [2021-05-06 00:49:16,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:49:16,966 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 166 [2021-05-06 00:49:16,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:49:16,969 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 199 [2021-05-06 00:49:16,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:49:16,970 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 232 [2021-05-06 00:49:16,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:49:16,972 INFO L134 CoverageAnalysis]: Checked inductivity of 16639 backedges. 4077 proven. 325 refuted. 0 times theorem prover too weak. 12237 trivial. 0 not checked. [2021-05-06 00:49:16,972 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:49:16,972 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1635267281] [2021-05-06 00:49:16,972 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1635267281] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:49:16,972 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1696150295] [2021-05-06 00:49:16,972 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 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 [2021-05-06 00:50:13,146 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 14 check-sat command(s) [2021-05-06 00:50:13,146 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:50:13,167 INFO L263 TraceCheckSpWp]: Trace formula consists of 356 conjuncts, 141 conjunts are in the unsatisfiable core [2021-05-06 00:50:13,169 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:50:13,505 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:50:13,677 INFO L134 CoverageAnalysis]: Checked inductivity of 16639 backedges. 7486 proven. 325 refuted. 0 times theorem prover too weak. 8828 trivial. 0 not checked. [2021-05-06 00:50:13,677 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1696150295] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:50:13,677 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:50:13,677 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 30 [2021-05-06 00:50:13,678 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [28792261] [2021-05-06 00:50:13,678 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-06 00:50:13,678 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:50:13,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-06 00:50:13,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2021-05-06 00:50:13,679 INFO L87 Difference]: Start difference. First operand 225 states and 240 transitions. Second operand has 30 states, 30 states have (on average 1.7) internal successors, (51), 29 states have internal predecessors, (51), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 00:50:15,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:50:15,060 INFO L93 Difference]: Finished difference Result 451 states and 488 transitions. [2021-05-06 00:50:15,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-06 00:50:15,061 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.7) internal successors, (51), 29 states have internal predecessors, (51), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 243 [2021-05-06 00:50:15,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:50:15,063 INFO L225 Difference]: With dead ends: 451 [2021-05-06 00:50:15,063 INFO L226 Difference]: Without dead ends: 233 [2021-05-06 00:50:15,064 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 313 GetRequests, 245 SyntacticMatches, 14 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 355 ImplicationChecksByTransitivity, 1488.4ms TimeCoverageRelationStatistics Valid=213, Invalid=2867, Unknown=0, NotChecked=0, Total=3080 [2021-05-06 00:50:15,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2021-05-06 00:50:15,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 232. [2021-05-06 00:50:15,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 232 states, 217 states have (on average 1.0460829493087558) internal successors, (227), 218 states have internal predecessors, (227), 11 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-06 00:50:15,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 247 transitions. [2021-05-06 00:50:15,099 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 247 transitions. Word has length 243 [2021-05-06 00:50:15,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:50:15,099 INFO L480 AbstractCegarLoop]: Abstraction has 232 states and 247 transitions. [2021-05-06 00:50:15,099 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 1.7) internal successors, (51), 29 states have internal predecessors, (51), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 00:50:15,099 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 247 transitions. [2021-05-06 00:50:15,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 251 [2021-05-06 00:50:15,100 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:50:15,100 INFO L523 BasicCegarLoop]: trace histogram [182, 8, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:50:15,310 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,27 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:50:15,310 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:50:15,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:50:15,311 INFO L82 PathProgramCache]: Analyzing trace with hash -1558592082, now seen corresponding path program 24 times [2021-05-06 00:50:15,311 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:50:15,311 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [168189262] [2021-05-06 00:50:15,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:50:15,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:50:15,858 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:50:15,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:50:15,863 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2021-05-06 00:50:15,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:50:15,864 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 69 [2021-05-06 00:50:15,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:50:15,872 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 103 [2021-05-06 00:50:15,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:50:15,874 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 137 [2021-05-06 00:50:15,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:50:15,875 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 171 [2021-05-06 00:50:15,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:50:15,876 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 205 [2021-05-06 00:50:15,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:50:15,878 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 239 [2021-05-06 00:50:15,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:50:15,879 INFO L134 CoverageAnalysis]: Checked inductivity of 17934 backedges. 4395 proven. 351 refuted. 0 times theorem prover too weak. 13188 trivial. 0 not checked. [2021-05-06 00:50:15,879 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:50:15,880 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [168189262] [2021-05-06 00:50:15,880 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [168189262] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:50:15,880 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2143079813] [2021-05-06 00:50:15,880 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 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 [2021-05-06 00:52:49,571 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 28 check-sat command(s) [2021-05-06 00:52:49,571 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:52:49,603 INFO L263 TraceCheckSpWp]: Trace formula consists of 550 conjuncts, 151 conjunts are in the unsatisfiable core [2021-05-06 00:52:49,606 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:52:49,912 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:52:50,074 INFO L134 CoverageAnalysis]: Checked inductivity of 17934 backedges. 8069 proven. 351 refuted. 0 times theorem prover too weak. 9514 trivial. 0 not checked. [2021-05-06 00:52:50,074 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2143079813] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:52:50,074 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:52:50,074 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29] total 31 [2021-05-06 00:52:50,075 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1812883493] [2021-05-06 00:52:50,075 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-06 00:52:50,075 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:52:50,076 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-06 00:52:50,076 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2021-05-06 00:52:50,076 INFO L87 Difference]: Start difference. First operand 232 states and 247 transitions. Second operand has 31 states, 31 states have (on average 1.6774193548387097) internal successors, (52), 30 states have internal predecessors, (52), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 00:52:51,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:52:51,401 INFO L93 Difference]: Finished difference Result 465 states and 502 transitions. [2021-05-06 00:52:51,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-06 00:52:51,402 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.6774193548387097) internal successors, (52), 30 states have internal predecessors, (52), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 250 [2021-05-06 00:52:51,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:52:51,402 INFO L225 Difference]: With dead ends: 465 [2021-05-06 00:52:51,403 INFO L226 Difference]: Without dead ends: 240 [2021-05-06 00:52:51,403 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 322 GetRequests, 251 SyntacticMatches, 15 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 383 ImplicationChecksByTransitivity, 1443.8ms TimeCoverageRelationStatistics Valid=221, Invalid=3085, Unknown=0, NotChecked=0, Total=3306 [2021-05-06 00:52:51,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 240 states. [2021-05-06 00:52:51,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 240 to 239. [2021-05-06 00:52:51,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 239 states, 224 states have (on average 1.0446428571428572) internal successors, (234), 225 states have internal predecessors, (234), 11 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-06 00:52:51,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 254 transitions. [2021-05-06 00:52:51,440 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 254 transitions. Word has length 250 [2021-05-06 00:52:51,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:52:51,440 INFO L480 AbstractCegarLoop]: Abstraction has 239 states and 254 transitions. [2021-05-06 00:52:51,440 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 1.6774193548387097) internal successors, (52), 30 states have internal predecessors, (52), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 00:52:51,441 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 254 transitions. [2021-05-06 00:52:51,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 258 [2021-05-06 00:52:51,442 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:52:51,442 INFO L523 BasicCegarLoop]: trace histogram [189, 8, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:52:51,657 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-05-06 00:52:51,657 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:52:51,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:52:51,657 INFO L82 PathProgramCache]: Analyzing trace with hash 1410078658, now seen corresponding path program 25 times [2021-05-06 00:52:51,657 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:52:51,657 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2124764666] [2021-05-06 00:52:51,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:52:51,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:52:52,210 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:52:52,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:52:52,221 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 36 [2021-05-06 00:52:52,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:52:52,223 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 71 [2021-05-06 00:52:52,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:52:52,224 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 106 [2021-05-06 00:52:52,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:52:52,225 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 141 [2021-05-06 00:52:52,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:52:52,226 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 176 [2021-05-06 00:52:52,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:52:52,227 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 211 [2021-05-06 00:52:52,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:52:52,228 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 246 [2021-05-06 00:52:52,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:52:52,230 INFO L134 CoverageAnalysis]: Checked inductivity of 19278 backedges. 4725 proven. 378 refuted. 0 times theorem prover too weak. 14175 trivial. 0 not checked. [2021-05-06 00:52:52,230 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:52:52,231 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2124764666] [2021-05-06 00:52:52,231 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2124764666] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:52:52,231 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [747887946] [2021-05-06 00:52:52,231 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 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 [2021-05-06 00:52:52,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:52:52,399 INFO L263 TraceCheckSpWp]: Trace formula consists of 766 conjuncts, 57 conjunts are in the unsatisfiable core [2021-05-06 00:52:52,402 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:52:52,487 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:52:52,702 INFO L134 CoverageAnalysis]: Checked inductivity of 19278 backedges. 4711 proven. 378 refuted. 0 times theorem prover too weak. 14189 trivial. 0 not checked. [2021-05-06 00:52:52,702 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [747887946] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:52:52,702 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:52:52,702 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 32 [2021-05-06 00:52:52,702 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1263766945] [2021-05-06 00:52:52,703 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-06 00:52:52,703 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:52:52,703 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-06 00:52:52,703 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2021-05-06 00:52:52,704 INFO L87 Difference]: Start difference. First operand 239 states and 254 transitions. Second operand has 32 states, 32 states have (on average 1.53125) internal successors, (49), 31 states have internal predecessors, (49), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 00:52:54,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:52:54,031 INFO L93 Difference]: Finished difference Result 479 states and 516 transitions. [2021-05-06 00:52:54,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-06 00:52:54,032 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.53125) internal successors, (49), 31 states have internal predecessors, (49), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 257 [2021-05-06 00:52:54,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:52:54,033 INFO L225 Difference]: With dead ends: 479 [2021-05-06 00:52:54,033 INFO L226 Difference]: Without dead ends: 247 [2021-05-06 00:52:54,033 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 273 SyntacticMatches, 1 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 382 ImplicationChecksByTransitivity, 1285.3ms TimeCoverageRelationStatistics Valid=229, Invalid=3311, Unknown=0, NotChecked=0, Total=3540 [2021-05-06 00:52:54,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2021-05-06 00:52:54,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 246. [2021-05-06 00:52:54,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 246 states, 231 states have (on average 1.0432900432900434) internal successors, (241), 232 states have internal predecessors, (241), 11 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-06 00:52:54,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 246 states to 246 states and 261 transitions. [2021-05-06 00:52:54,069 INFO L78 Accepts]: Start accepts. Automaton has 246 states and 261 transitions. Word has length 257 [2021-05-06 00:52:54,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:52:54,070 INFO L480 AbstractCegarLoop]: Abstraction has 246 states and 261 transitions. [2021-05-06 00:52:54,070 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 1.53125) internal successors, (49), 31 states have internal predecessors, (49), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 00:52:54,070 INFO L276 IsEmpty]: Start isEmpty. Operand 246 states and 261 transitions. [2021-05-06 00:52:54,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 265 [2021-05-06 00:52:54,071 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:52:54,071 INFO L523 BasicCegarLoop]: trace histogram [196, 8, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:52:54,272 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:52:54,273 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:52:54,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:52:54,273 INFO L82 PathProgramCache]: Analyzing trace with hash 1963345710, now seen corresponding path program 26 times [2021-05-06 00:52:54,273 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:52:54,273 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [289717590] [2021-05-06 00:52:54,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:52:54,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:52:54,850 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:52:54,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:52:54,862 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-05-06 00:52:54,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:52:54,863 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 73 [2021-05-06 00:52:54,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:52:54,864 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 109 [2021-05-06 00:52:54,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:52:54,865 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 145 [2021-05-06 00:52:54,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:52:54,866 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 181 [2021-05-06 00:52:54,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:52:54,867 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 217 [2021-05-06 00:52:54,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:52:54,869 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 253 [2021-05-06 00:52:54,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:52:54,871 INFO L134 CoverageAnalysis]: Checked inductivity of 20671 backedges. 5067 proven. 406 refuted. 0 times theorem prover too weak. 15198 trivial. 0 not checked. [2021-05-06 00:52:54,871 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:52:54,871 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [289717590] [2021-05-06 00:52:54,871 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [289717590] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:52:54,871 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1982328650] [2021-05-06 00:52:54,871 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:52:55,028 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 00:52:55,028 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:52:55,030 INFO L263 TraceCheckSpWp]: Trace formula consists of 787 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-06 00:52:55,033 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:52:55,530 INFO L134 CoverageAnalysis]: Checked inductivity of 20671 backedges. 14 proven. 17731 refuted. 0 times theorem prover too weak. 2926 trivial. 0 not checked. [2021-05-06 00:52:55,531 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1982328650] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:52:55,531 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:52:55,531 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 10] total 40 [2021-05-06 00:52:55,531 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1946094053] [2021-05-06 00:52:55,531 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-06 00:52:55,531 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:52:55,532 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-06 00:52:55,532 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1455, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 00:52:55,532 INFO L87 Difference]: Start difference. First operand 246 states and 261 transitions. Second operand has 40 states, 40 states have (on average 1.9) internal successors, (76), 39 states have internal predecessors, (76), 9 states have call successors, (12), 3 states have call predecessors, (12), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-06 00:53:08,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:53:08,929 INFO L93 Difference]: Finished difference Result 558 states and 602 transitions. [2021-05-06 00:53:08,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 272 states. [2021-05-06 00:53:08,930 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.9) internal successors, (76), 39 states have internal predecessors, (76), 9 states have call successors, (12), 3 states have call predecessors, (12), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Word has length 264 [2021-05-06 00:53:08,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:53:08,931 INFO L225 Difference]: With dead ends: 558 [2021-05-06 00:53:08,931 INFO L226 Difference]: Without dead ends: 319 [2021-05-06 00:53:08,935 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 582 GetRequests, 275 SyntacticMatches, 0 SemanticMatches, 307 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35852 ImplicationChecksByTransitivity, 10590.9ms TimeCoverageRelationStatistics Valid=2605, Invalid=92567, Unknown=0, NotChecked=0, Total=95172 [2021-05-06 00:53:08,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 319 states. [2021-05-06 00:53:08,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 319 to 286. [2021-05-06 00:53:08,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 286 states, 270 states have (on average 1.0407407407407407) internal successors, (281), 271 states have internal predecessors, (281), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-06 00:53:08,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 303 transitions. [2021-05-06 00:53:08,982 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 303 transitions. Word has length 264 [2021-05-06 00:53:08,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:53:08,982 INFO L480 AbstractCegarLoop]: Abstraction has 286 states and 303 transitions. [2021-05-06 00:53:08,983 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 40 states have (on average 1.9) internal successors, (76), 39 states have internal predecessors, (76), 9 states have call successors, (12), 3 states have call predecessors, (12), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-06 00:53:08,983 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 303 transitions. [2021-05-06 00:53:08,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 309 [2021-05-06 00:53:08,984 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:53:08,984 INFO L523 BasicCegarLoop]: trace histogram [232, 9, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:53:09,188 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-05-06 00:53:09,189 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:53:09,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:53:09,189 INFO L82 PathProgramCache]: Analyzing trace with hash -255623392, now seen corresponding path program 27 times [2021-05-06 00:53:09,189 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:53:09,189 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [363767359] [2021-05-06 00:53:09,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:53:09,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:53:09,828 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:53:09,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:53:09,832 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 38 [2021-05-06 00:53:09,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:53:09,835 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 75 [2021-05-06 00:53:09,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:53:09,835 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 112 [2021-05-06 00:53:09,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:53:09,836 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 149 [2021-05-06 00:53:09,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:53:09,837 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 186 [2021-05-06 00:53:09,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:53:09,838 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 223 [2021-05-06 00:53:09,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:53:09,842 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 260 [2021-05-06 00:53:09,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:53:09,843 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 297 [2021-05-06 00:53:09,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:53:09,845 INFO L134 CoverageAnalysis]: Checked inductivity of 28900 backedges. 6324 proven. 435 refuted. 0 times theorem prover too weak. 22141 trivial. 0 not checked. [2021-05-06 00:53:09,845 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:53:09,845 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [363767359] [2021-05-06 00:53:09,845 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [363767359] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:53:09,845 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1850508683] [2021-05-06 00:53:09,845 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 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 [2021-05-06 00:53:12,383 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 32 check-sat command(s) [2021-05-06 00:53:12,383 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:53:12,389 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 135 conjunts are in the unsatisfiable core [2021-05-06 00:53:12,399 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:53:12,596 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:53:12,597 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:53:12,602 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:53:12,603 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:53:12,606 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:53:12,607 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:53:12,610 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:53:12,611 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:53:12,614 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:53:12,614 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:53:12,619 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:53:12,620 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:53:13,362 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:53:13,374 INFO L134 CoverageAnalysis]: Checked inductivity of 28900 backedges. 5854 proven. 4345 refuted. 0 times theorem prover too weak. 18701 trivial. 0 not checked. [2021-05-06 00:53:13,374 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1850508683] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:53:13,374 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:53:13,374 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32] total 34 [2021-05-06 00:53:13,374 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1452319566] [2021-05-06 00:53:13,375 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-06 00:53:13,375 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:53:13,375 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-06 00:53:13,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1027, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 00:53:13,375 INFO L87 Difference]: Start difference. First operand 286 states and 303 transitions. Second operand has 34 states, 34 states have (on average 1.6470588235294117) internal successors, (56), 33 states have internal predecessors, (56), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 00:53:14,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:53:14,895 INFO L93 Difference]: Finished difference Result 574 states and 616 transitions. [2021-05-06 00:53:14,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-06 00:53:14,895 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.6470588235294117) internal successors, (56), 33 states have internal predecessors, (56), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 308 [2021-05-06 00:53:14,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:53:14,896 INFO L225 Difference]: With dead ends: 574 [2021-05-06 00:53:14,896 INFO L226 Difference]: Without dead ends: 295 [2021-05-06 00:53:14,897 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 388 GetRequests, 291 SyntacticMatches, 35 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 507 ImplicationChecksByTransitivity, 1998.7ms TimeCoverageRelationStatistics Valid=245, Invalid=3787, Unknown=0, NotChecked=0, Total=4032 [2021-05-06 00:53:14,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 295 states. [2021-05-06 00:53:14,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 295 to 294. [2021-05-06 00:53:14,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 294 states, 278 states have (on average 1.039568345323741) internal successors, (289), 279 states have internal predecessors, (289), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-06 00:53:14,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 294 states to 294 states and 311 transitions. [2021-05-06 00:53:14,937 INFO L78 Accepts]: Start accepts. Automaton has 294 states and 311 transitions. Word has length 308 [2021-05-06 00:53:14,937 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:53:14,937 INFO L480 AbstractCegarLoop]: Abstraction has 294 states and 311 transitions. [2021-05-06 00:53:14,937 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 1.6470588235294117) internal successors, (56), 33 states have internal predecessors, (56), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 00:53:14,937 INFO L276 IsEmpty]: Start isEmpty. Operand 294 states and 311 transitions. [2021-05-06 00:53:14,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 317 [2021-05-06 00:53:14,939 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:53:14,939 INFO L523 BasicCegarLoop]: trace histogram [240, 9, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:53:15,144 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:53:15,145 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:53:15,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:53:15,145 INFO L82 PathProgramCache]: Analyzing trace with hash 1164865584, now seen corresponding path program 28 times [2021-05-06 00:53:15,145 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:53:15,145 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [925850522] [2021-05-06 00:53:15,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:53:15,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:53:15,847 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:53:15,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:53:15,849 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2021-05-06 00:53:15,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:53:15,850 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 77 [2021-05-06 00:53:15,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:53:15,851 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 115 [2021-05-06 00:53:15,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:53:15,852 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 153 [2021-05-06 00:53:15,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:53:15,853 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 191 [2021-05-06 00:53:15,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:53:15,854 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 229 [2021-05-06 00:53:15,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:53:15,855 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 267 [2021-05-06 00:53:15,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:53:15,856 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 305 [2021-05-06 00:53:15,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:53:15,858 INFO L134 CoverageAnalysis]: Checked inductivity of 30848 backedges. 6751 proven. 465 refuted. 0 times theorem prover too weak. 23632 trivial. 0 not checked. [2021-05-06 00:53:15,858 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:53:15,859 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [925850522] [2021-05-06 00:53:15,859 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [925850522] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:53:15,859 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [911140503] [2021-05-06 00:53:15,859 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 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 [2021-05-06 00:53:16,089 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 00:53:16,089 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:53:16,092 INFO L263 TraceCheckSpWp]: Trace formula consists of 934 conjuncts, 63 conjunts are in the unsatisfiable core [2021-05-06 00:53:16,098 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:53:16,186 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:53:16,424 INFO L134 CoverageAnalysis]: Checked inductivity of 30848 backedges. 6735 proven. 465 refuted. 0 times theorem prover too weak. 23648 trivial. 0 not checked. [2021-05-06 00:53:16,424 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [911140503] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:53:16,424 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:53:16,425 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33] total 35 [2021-05-06 00:53:16,425 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1465653399] [2021-05-06 00:53:16,425 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-06 00:53:16,425 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:53:16,425 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-06 00:53:16,425 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 00:53:16,426 INFO L87 Difference]: Start difference. First operand 294 states and 311 transitions. Second operand has 35 states, 35 states have (on average 1.4857142857142858) internal successors, (52), 34 states have internal predecessors, (52), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 00:53:17,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:53:17,860 INFO L93 Difference]: Finished difference Result 590 states and 632 transitions. [2021-05-06 00:53:17,860 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-06 00:53:17,860 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.4857142857142858) internal successors, (52), 34 states have internal predecessors, (52), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 316 [2021-05-06 00:53:17,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:53:17,861 INFO L225 Difference]: With dead ends: 590 [2021-05-06 00:53:17,861 INFO L226 Difference]: Without dead ends: 303 [2021-05-06 00:53:17,862 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 399 GetRequests, 334 SyntacticMatches, 1 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 469 ImplicationChecksByTransitivity, 1543.8ms TimeCoverageRelationStatistics Valid=253, Invalid=4037, Unknown=0, NotChecked=0, Total=4290 [2021-05-06 00:53:17,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 303 states. [2021-05-06 00:53:17,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 303 to 302. [2021-05-06 00:53:17,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 302 states, 286 states have (on average 1.0384615384615385) internal successors, (297), 287 states have internal predecessors, (297), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-06 00:53:17,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 302 states to 302 states and 319 transitions. [2021-05-06 00:53:17,911 INFO L78 Accepts]: Start accepts. Automaton has 302 states and 319 transitions. Word has length 316 [2021-05-06 00:53:17,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:53:17,912 INFO L480 AbstractCegarLoop]: Abstraction has 302 states and 319 transitions. [2021-05-06 00:53:17,912 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 1.4857142857142858) internal successors, (52), 34 states have internal predecessors, (52), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 00:53:17,912 INFO L276 IsEmpty]: Start isEmpty. Operand 302 states and 319 transitions. [2021-05-06 00:53:17,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 325 [2021-05-06 00:53:17,913 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:53:17,914 INFO L523 BasicCegarLoop]: trace histogram [248, 9, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:53:18,127 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-05-06 00:53:18,128 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:53:18,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:53:18,128 INFO L82 PathProgramCache]: Analyzing trace with hash -1140522720, now seen corresponding path program 29 times [2021-05-06 00:53:18,128 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:53:18,128 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [473130673] [2021-05-06 00:53:18,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:53:18,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:53:18,839 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:53:18,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:53:18,841 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-05-06 00:53:18,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:53:18,842 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 79 [2021-05-06 00:53:18,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:53:18,856 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 118 [2021-05-06 00:53:18,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:53:18,858 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 157 [2021-05-06 00:53:18,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:53:18,859 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 196 [2021-05-06 00:53:18,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:53:18,860 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 235 [2021-05-06 00:53:18,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:53:18,861 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 274 [2021-05-06 00:53:18,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:53:18,865 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 313 [2021-05-06 00:53:18,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:53:18,867 INFO L134 CoverageAnalysis]: Checked inductivity of 32860 backedges. 7192 proven. 496 refuted. 0 times theorem prover too weak. 25172 trivial. 0 not checked. [2021-05-06 00:53:18,867 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:53:18,867 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [473130673] [2021-05-06 00:53:18,867 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [473130673] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:53:18,867 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [47720765] [2021-05-06 00:53:18,867 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 00:57:01,935 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 17 check-sat command(s) [2021-05-06 00:57:01,935 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 00:57:01,975 INFO L263 TraceCheckSpWp]: Trace formula consists of 515 conjuncts, 67 conjunts are in the unsatisfiable core [2021-05-06 00:57:01,978 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 00:57:02,148 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 00:57:02,362 INFO L134 CoverageAnalysis]: Checked inductivity of 32860 backedges. 13370 proven. 496 refuted. 0 times theorem prover too weak. 18994 trivial. 0 not checked. [2021-05-06 00:57:02,362 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [47720765] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:57:02,362 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 00:57:02,363 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34] total 36 [2021-05-06 00:57:02,363 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1990309424] [2021-05-06 00:57:02,363 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-06 00:57:02,363 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 00:57:02,363 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-06 00:57:02,363 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1159, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 00:57:02,363 INFO L87 Difference]: Start difference. First operand 302 states and 319 transitions. Second operand has 36 states, 36 states have (on average 1.5833333333333333) internal successors, (57), 35 states have internal predecessors, (57), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 00:57:03,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 00:57:03,849 INFO L93 Difference]: Finished difference Result 606 states and 648 transitions. [2021-05-06 00:57:03,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-06 00:57:03,849 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.5833333333333333) internal successors, (57), 35 states have internal predecessors, (57), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 324 [2021-05-06 00:57:03,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 00:57:03,850 INFO L225 Difference]: With dead ends: 606 [2021-05-06 00:57:03,850 INFO L226 Difference]: Without dead ends: 311 [2021-05-06 00:57:03,851 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 408 GetRequests, 339 SyntacticMatches, 3 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 504 ImplicationChecksByTransitivity, 1613.9ms TimeCoverageRelationStatistics Valid=261, Invalid=4295, Unknown=0, NotChecked=0, Total=4556 [2021-05-06 00:57:03,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 311 states. [2021-05-06 00:57:03,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 311 to 310. [2021-05-06 00:57:03,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 310 states, 294 states have (on average 1.0374149659863945) internal successors, (305), 295 states have internal predecessors, (305), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-06 00:57:03,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 310 states to 310 states and 327 transitions. [2021-05-06 00:57:03,900 INFO L78 Accepts]: Start accepts. Automaton has 310 states and 327 transitions. Word has length 324 [2021-05-06 00:57:03,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 00:57:03,901 INFO L480 AbstractCegarLoop]: Abstraction has 310 states and 327 transitions. [2021-05-06 00:57:03,901 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 1.5833333333333333) internal successors, (57), 35 states have internal predecessors, (57), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 00:57:03,901 INFO L276 IsEmpty]: Start isEmpty. Operand 310 states and 327 transitions. [2021-05-06 00:57:03,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 333 [2021-05-06 00:57:03,902 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 00:57:03,902 INFO L523 BasicCegarLoop]: trace histogram [256, 9, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 00:57:04,119 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-05-06 00:57:04,119 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 00:57:04,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 00:57:04,119 INFO L82 PathProgramCache]: Analyzing trace with hash 658416176, now seen corresponding path program 30 times [2021-05-06 00:57:04,120 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 00:57:04,120 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1810844749] [2021-05-06 00:57:04,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 00:57:04,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:57:04,942 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 00:57:04,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:57:04,945 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-05-06 00:57:04,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:57:04,947 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 81 [2021-05-06 00:57:04,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:57:04,947 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 121 [2021-05-06 00:57:04,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:57:04,948 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 161 [2021-05-06 00:57:04,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:57:04,949 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 201 [2021-05-06 00:57:04,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:57:04,950 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 241 [2021-05-06 00:57:04,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:57:04,951 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 281 [2021-05-06 00:57:04,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:57:04,952 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 321 [2021-05-06 00:57:04,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 00:57:04,954 INFO L134 CoverageAnalysis]: Checked inductivity of 34936 backedges. 7647 proven. 528 refuted. 0 times theorem prover too weak. 26761 trivial. 0 not checked. [2021-05-06 00:57:04,955 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 00:57:04,955 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1810844749] [2021-05-06 00:57:04,955 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1810844749] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 00:57:04,955 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1181145268] [2021-05-06 00:57:04,955 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 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