/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-industry-pattern/nested-3.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 12:47:26,458 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 12:47:26,461 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 12:47:26,496 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 12:47:26,514 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 12:47:26,515 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 12:47:26,517 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 12:47:26,518 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 12:47:26,520 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 12:47:26,521 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 12:47:26,522 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 12:47:26,527 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 12:47:26,528 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 12:47:26,529 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 12:47:26,530 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 12:47:26,532 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 12:47:26,537 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 12:47:26,544 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 12:47:26,546 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 12:47:26,546 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 12:47:26,550 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2021-05-02 12:47:26,586 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 12:47:26,586 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 12:47:26,589 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 12:47:26,589 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 12:47:26,589 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 12:47:26,589 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 12:47:26,589 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 12:47:26,589 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 12:47:26,589 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 12:47:26,590 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 12:47:26,590 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 12:47:26,590 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 12:47:26,591 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 12:47:26,591 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 12:47:26,591 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 12:47:26,591 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 12:47:26,591 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 12:47:26,591 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 12:47:26,591 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 12:47:26,591 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 12:47:26,592 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 12:47:26,592 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 12:47:26,592 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 12:47:26,592 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 12:47:26,592 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 12:47:26,592 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 12:47:26,592 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 12:47:26,592 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 12:47:26,593 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 12:47:26,924 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 12:47:26,945 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 12:47:26,947 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 12:47:26,948 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 12:47:26,949 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 12:47:26,949 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-industry-pattern/nested-3.c [2021-05-02 12:47:27,005 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a95a37d07/30023af4a3bb4d9a94f1f67597cfc71e/FLAGb6cbca1fb [2021-05-02 12:47:27,377 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 12:47:27,377 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-industry-pattern/nested-3.c [2021-05-02 12:47:27,382 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a95a37d07/30023af4a3bb4d9a94f1f67597cfc71e/FLAGb6cbca1fb [2021-05-02 12:47:27,821 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a95a37d07/30023af4a3bb4d9a94f1f67597cfc71e [2021-05-02 12:47:27,823 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 12:47:27,825 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 12:47:27,828 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 12:47:27,829 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 12:47:27,832 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 12:47:27,833 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 12:47:27" (1/1) ... [2021-05-02 12:47:27,834 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@eb75afe and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:47:27, skipping insertion in model container [2021-05-02 12:47:27,834 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 12:47:27" (1/1) ... [2021-05-02 12:47:27,839 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 12:47:27,851 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 12:47:27,962 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-industry-pattern/nested-3.c[404,417] [2021-05-02 12:47:27,970 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 12:47:27,976 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 12:47:28,030 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-industry-pattern/nested-3.c[404,417] [2021-05-02 12:47:28,034 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 12:47:28,045 INFO L208 MainTranslator]: Completed translation [2021-05-02 12:47:28,045 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:47:28 WrapperNode [2021-05-02 12:47:28,045 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 12:47:28,046 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 12:47:28,046 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 12:47:28,048 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 12:47:28,056 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:47:28" (1/1) ... [2021-05-02 12:47:28,057 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:47:28" (1/1) ... [2021-05-02 12:47:28,065 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:47:28" (1/1) ... [2021-05-02 12:47:28,066 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:47:28" (1/1) ... [2021-05-02 12:47:28,078 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:47:28" (1/1) ... [2021-05-02 12:47:28,084 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:47:28" (1/1) ... [2021-05-02 12:47:28,088 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:47:28" (1/1) ... [2021-05-02 12:47:28,091 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 12:47:28,093 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 12:47:28,093 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 12:47:28,093 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 12:47:28,093 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:47:28" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 12:47:28,166 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 12:47:28,167 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 12:47:28,167 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 12:47:28,167 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 12:47:28,167 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 12:47:28,167 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 12:47:28,168 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 12:47:28,168 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 12:47:28,168 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 12:47:28,169 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-02 12:47:28,169 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 12:47:28,169 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 12:47:28,169 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 12:47:28,169 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 12:47:28,170 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 12:47:28,170 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 12:47:28,170 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 12:47:28,170 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 12:47:28,441 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 12:47:28,442 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-02 12:47:28,443 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 12:47:28 BoogieIcfgContainer [2021-05-02 12:47:28,443 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 12:47:28,445 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 12:47:28,445 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 12:47:28,457 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 12:47:28,457 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 12:47:27" (1/3) ... [2021-05-02 12:47:28,458 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@788fdf08 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 12:47:28, skipping insertion in model container [2021-05-02 12:47:28,458 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:47:28" (2/3) ... [2021-05-02 12:47:28,458 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@788fdf08 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 12:47:28, skipping insertion in model container [2021-05-02 12:47:28,458 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 12:47:28" (3/3) ... [2021-05-02 12:47:28,459 INFO L111 eAbstractionObserver]: Analyzing ICFG nested-3.c [2021-05-02 12:47:28,463 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 12:47:28,466 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 12:47:28,478 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 12:47:28,493 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 12:47:28,494 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 12:47:28,494 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 12:47:28,494 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 12:47:28,494 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 12:47:28,494 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 12:47:28,494 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 12:47:28,494 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 12:47:28,506 INFO L276 IsEmpty]: Start isEmpty. Operand has 23 states, 15 states have (on average 1.6) internal successors, (24), 17 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 12:47:28,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 12:47:28,510 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:47:28,511 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:47:28,511 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:47:28,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:47:28,517 INFO L82 PathProgramCache]: Analyzing trace with hash -1677248157, now seen corresponding path program 1 times [2021-05-02 12:47:28,523 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:47:28,523 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1680793103] [2021-05-02 12:47:28,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:47:28,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:28,741 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:47:28,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:28,774 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:47:28,775 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:47:28,775 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1680793103] [2021-05-02 12:47:28,776 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1680793103] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 12:47:28,777 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 12:47:28,777 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 12:47:28,778 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1311052295] [2021-05-02 12:47:28,781 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 12:47:28,783 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:47:28,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 12:47:28,795 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 12:47:28,796 INFO L87 Difference]: Start difference. First operand has 23 states, 15 states have (on average 1.6) internal successors, (24), 17 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:47:28,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:47:28,909 INFO L93 Difference]: Finished difference Result 40 states and 61 transitions. [2021-05-02 12:47:28,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 12:47:28,912 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-05-02 12:47:28,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:47:28,918 INFO L225 Difference]: With dead ends: 40 [2021-05-02 12:47:28,918 INFO L226 Difference]: Without dead ends: 23 [2021-05-02 12:47:28,920 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 70.5ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 12:47:28,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-02 12:47:28,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2021-05-02 12:47:28,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 15 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 12:47:28,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2021-05-02 12:47:28,951 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 14 [2021-05-02 12:47:28,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:47:28,951 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2021-05-02 12:47:28,952 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:47:28,952 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2021-05-02 12:47:28,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 12:47:28,952 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:47:28,952 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:47:28,953 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 12:47:28,953 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:47:28,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:47:28,954 INFO L82 PathProgramCache]: Analyzing trace with hash -946078686, now seen corresponding path program 1 times [2021-05-02 12:47:28,954 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:47:28,954 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [142414337] [2021-05-02 12:47:28,954 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:47:28,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:29,112 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:47:29,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:29,135 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:47:29,135 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:47:29,136 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [142414337] [2021-05-02 12:47:29,136 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [142414337] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:29,136 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1830335179] [2021-05-02 12:47:29,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:47:29,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:29,214 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 2 conjunts are in the unsatisfiable core [2021-05-02 12:47:29,219 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:47:29,275 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 12:47:29,275 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1830335179] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 12:47:29,276 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 12:47:29,276 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-05-02 12:47:29,276 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1870208098] [2021-05-02 12:47:29,277 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 12:47:29,277 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:47:29,277 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 12:47:29,278 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-05-02 12:47:29,278 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:47:29,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:47:29,306 INFO L93 Difference]: Finished difference Result 37 states and 47 transitions. [2021-05-02 12:47:29,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 12:47:29,307 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 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 17 [2021-05-02 12:47:29,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:47:29,309 INFO L225 Difference]: With dead ends: 37 [2021-05-02 12:47:29,309 INFO L226 Difference]: Without dead ends: 23 [2021-05-02 12:47:29,310 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 103.2ms TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-05-02 12:47:29,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-02 12:47:29,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2021-05-02 12:47:29,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 16 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 12:47:29,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2021-05-02 12:47:29,315 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 17 [2021-05-02 12:47:29,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:47:29,315 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2021-05-02 12:47:29,315 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:47:29,316 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2021-05-02 12:47:29,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 12:47:29,316 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:47:29,316 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:47:29,523 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-02 12:47:29,525 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:47:29,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:47:29,526 INFO L82 PathProgramCache]: Analyzing trace with hash -944231644, now seen corresponding path program 1 times [2021-05-02 12:47:29,526 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:47:29,526 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [59884511] [2021-05-02 12:47:29,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:47:29,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:29,580 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:47:29,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:29,596 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:47:29,596 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:47:29,596 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [59884511] [2021-05-02 12:47:29,597 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [59884511] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:29,597 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [382329822] [2021-05-02 12:47:29,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:47:29,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:29,686 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 3 conjunts are in the unsatisfiable core [2021-05-02 12:47:29,688 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:47:29,741 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:29,745 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:29,784 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:47:29,785 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [382329822] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:29,785 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:47:29,785 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-02 12:47:29,785 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [313565455] [2021-05-02 12:47:29,785 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 12:47:29,785 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:47:29,786 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 12:47:29,786 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 12:47:29,786 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:47:29,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:47:29,853 INFO L93 Difference]: Finished difference Result 42 states and 53 transitions. [2021-05-02 12:47:29,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 12:47:29,854 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-02 12:47:29,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:47:29,856 INFO L225 Difference]: With dead ends: 42 [2021-05-02 12:47:29,856 INFO L226 Difference]: Without dead ends: 27 [2021-05-02 12:47:29,858 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 40.0ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 12:47:29,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-02 12:47:29,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2021-05-02 12:47:29,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 19 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 12:47:29,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2021-05-02 12:47:29,870 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 17 [2021-05-02 12:47:29,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:47:29,871 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2021-05-02 12:47:29,871 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:47:29,871 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2021-05-02 12:47:29,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 12:47:29,871 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:47:29,872 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:47:30,084 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:47:30,087 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:47:30,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:47:30,088 INFO L82 PathProgramCache]: Analyzing trace with hash 1546320901, now seen corresponding path program 2 times [2021-05-02 12:47:30,088 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:47:30,088 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [877393436] [2021-05-02 12:47:30,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:47:30,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:30,152 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:47:30,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:30,158 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:47:30,159 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:47:30,159 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [877393436] [2021-05-02 12:47:30,159 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [877393436] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:30,159 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2069923860] [2021-05-02 12:47:30,159 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:47:30,230 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:47:30,231 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:47:30,232 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 12:47:30,233 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:47:30,272 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:30,349 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:30,359 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 12:47:30,359 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2069923860] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:30,359 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:47:30,359 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 9 [2021-05-02 12:47:30,359 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1418956247] [2021-05-02 12:47:30,360 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 12:47:30,360 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:47:30,360 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 12:47:30,360 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2021-05-02 12:47:30,361 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 8 states have internal predecessors, (25), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:47:30,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:47:30,511 INFO L93 Difference]: Finished difference Result 72 states and 94 transitions. [2021-05-02 12:47:30,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 12:47:30,512 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 8 states have internal predecessors, (25), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2021-05-02 12:47:30,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:47:30,513 INFO L225 Difference]: With dead ends: 72 [2021-05-02 12:47:30,513 INFO L226 Difference]: Without dead ends: 54 [2021-05-02 12:47:30,514 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 102.5ms TimeCoverageRelationStatistics Valid=54, Invalid=128, Unknown=0, NotChecked=0, Total=182 [2021-05-02 12:47:30,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-05-02 12:47:30,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 45. [2021-05-02 12:47:30,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 37 states have (on average 1.3243243243243243) internal successors, (49), 38 states have internal predecessors, (49), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 12:47:30,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 56 transitions. [2021-05-02 12:47:30,520 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 56 transitions. Word has length 20 [2021-05-02 12:47:30,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:47:30,520 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 56 transitions. [2021-05-02 12:47:30,520 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 8 states have internal predecessors, (25), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:47:30,520 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 56 transitions. [2021-05-02 12:47:30,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 12:47:30,520 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:47:30,521 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:47:30,737 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:47:30,737 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:47:30,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:47:30,738 INFO L82 PathProgramCache]: Analyzing trace with hash -1262334590, now seen corresponding path program 1 times [2021-05-02 12:47:30,738 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:47:30,738 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1940150941] [2021-05-02 12:47:30,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:47:30,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:30,798 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:47:30,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:30,812 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:47:30,812 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:47:30,812 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1940150941] [2021-05-02 12:47:30,812 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1940150941] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:30,813 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [754513057] [2021-05-02 12:47:30,813 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 [2021-05-02 12:47:30,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:30,861 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 12:47:30,862 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:47:30,880 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:30,882 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:30,896 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:30,901 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:30,912 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:30,915 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:30,927 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:47:30,928 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [754513057] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:30,928 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:47:30,928 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 12:47:30,929 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [658047141] [2021-05-02 12:47:30,930 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 12:47:30,932 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:47:30,933 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 12:47:30,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 12:47:30,933 INFO L87 Difference]: Start difference. First operand 45 states and 56 transitions. Second operand has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:47:31,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:47:31,028 INFO L93 Difference]: Finished difference Result 110 states and 141 transitions. [2021-05-02 12:47:31,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 12:47:31,030 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2021-05-02 12:47:31,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:47:31,031 INFO L225 Difference]: With dead ends: 110 [2021-05-02 12:47:31,031 INFO L226 Difference]: Without dead ends: 71 [2021-05-02 12:47:31,031 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 40.1ms TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 12:47:31,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-05-02 12:47:31,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 51. [2021-05-02 12:47:31,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 43 states have (on average 1.3255813953488371) internal successors, (57), 44 states have internal predecessors, (57), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 12:47:31,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 64 transitions. [2021-05-02 12:47:31,043 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 64 transitions. Word has length 23 [2021-05-02 12:47:31,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:47:31,043 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 64 transitions. [2021-05-02 12:47:31,043 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:47:31,043 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 64 transitions. [2021-05-02 12:47:31,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 12:47:31,044 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:47:31,044 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:47:31,249 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:47:31,250 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:47:31,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:47:31,250 INFO L82 PathProgramCache]: Analyzing trace with hash 976433571, now seen corresponding path program 2 times [2021-05-02 12:47:31,250 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:47:31,250 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1684638097] [2021-05-02 12:47:31,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:47:31,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:31,323 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:47:31,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:31,335 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:47:31,337 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:47:31,337 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1684638097] [2021-05-02 12:47:31,337 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1684638097] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:31,337 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [829584215] [2021-05-02 12:47:31,337 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 [2021-05-02 12:47:31,390 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:47:31,390 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:47:31,391 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 3 conjunts are in the unsatisfiable core [2021-05-02 12:47:31,394 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:47:31,429 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:31,431 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:31,459 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 12:47:31,459 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [829584215] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 12:47:31,459 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 12:47:31,459 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [8] total 10 [2021-05-02 12:47:31,459 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [681035105] [2021-05-02 12:47:31,460 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 12:47:31,460 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:47:31,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 12:47:31,461 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-02 12:47:31,461 INFO L87 Difference]: Start difference. First operand 51 states and 64 transitions. Second operand has 4 states, 4 states have (on average 4.5) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:47:31,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:47:31,494 INFO L93 Difference]: Finished difference Result 128 states and 166 transitions. [2021-05-02 12:47:31,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 12:47:31,495 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 4 states have internal predecessors, (18), 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 26 [2021-05-02 12:47:31,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:47:31,495 INFO L225 Difference]: With dead ends: 128 [2021-05-02 12:47:31,495 INFO L226 Difference]: Without dead ends: 83 [2021-05-02 12:47:31,496 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 64.9ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-02 12:47:31,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-05-02 12:47:31,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 71. [2021-05-02 12:47:31,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 63 states have (on average 1.2698412698412698) internal successors, (80), 64 states have internal predecessors, (80), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 12:47:31,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 87 transitions. [2021-05-02 12:47:31,503 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 87 transitions. Word has length 26 [2021-05-02 12:47:31,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:47:31,503 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 87 transitions. [2021-05-02 12:47:31,503 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:47:31,503 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 87 transitions. [2021-05-02 12:47:31,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 12:47:31,504 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:47:31,504 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:47:31,704 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-05-02 12:47:31,704 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:47:31,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:47:31,705 INFO L82 PathProgramCache]: Analyzing trace with hash -303430107, now seen corresponding path program 3 times [2021-05-02 12:47:31,705 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:47:31,705 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [448491987] [2021-05-02 12:47:31,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:47:31,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:31,764 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:47:31,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:31,773 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:47:31,774 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:47:31,774 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [448491987] [2021-05-02 12:47:31,774 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [448491987] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:31,774 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2067782172] [2021-05-02 12:47:31,774 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 [2021-05-02 12:47:31,820 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 12:47:31,820 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:47:31,821 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 12:47:31,822 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:47:31,895 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:31,899 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:31,954 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:31,957 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:31,968 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:31,999 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 12:47:31,999 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2067782172] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 12:47:31,999 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 12:47:31,999 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [8] total 15 [2021-05-02 12:47:31,999 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1241254317] [2021-05-02 12:47:32,000 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 12:47:32,000 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:47:32,000 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 12:47:32,000 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-02 12:47:32,001 INFO L87 Difference]: Start difference. First operand 71 states and 87 transitions. Second operand has 9 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 8 states have internal predecessors, (17), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:47:32,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:47:32,062 INFO L93 Difference]: Finished difference Result 124 states and 151 transitions. [2021-05-02 12:47:32,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 12:47:32,063 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 8 states have internal predecessors, (17), 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 26 [2021-05-02 12:47:32,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:47:32,064 INFO L225 Difference]: With dead ends: 124 [2021-05-02 12:47:32,064 INFO L226 Difference]: Without dead ends: 122 [2021-05-02 12:47:32,065 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 107.9ms TimeCoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2021-05-02 12:47:32,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-05-02 12:47:32,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 120. [2021-05-02 12:47:32,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 108 states have (on average 1.25) internal successors, (135), 110 states have internal predecessors, (135), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 12:47:32,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 146 transitions. [2021-05-02 12:47:32,074 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 146 transitions. Word has length 26 [2021-05-02 12:47:32,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:47:32,074 INFO L480 AbstractCegarLoop]: Abstraction has 120 states and 146 transitions. [2021-05-02 12:47:32,075 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 8 states have internal predecessors, (17), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:47:32,075 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 146 transitions. [2021-05-02 12:47:32,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 12:47:32,075 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:47:32,075 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:47:32,295 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:47:32,295 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:47:32,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:47:32,296 INFO L82 PathProgramCache]: Analyzing trace with hash -1074969437, now seen corresponding path program 1 times [2021-05-02 12:47:32,296 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:47:32,296 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1271194706] [2021-05-02 12:47:32,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:47:32,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:32,363 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:47:32,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:32,372 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:47:32,373 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:47:32,373 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1271194706] [2021-05-02 12:47:32,373 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1271194706] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:32,373 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1658446367] [2021-05-02 12:47:32,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:47:32,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:32,409 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 12:47:32,410 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:47:32,427 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:32,428 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:32,433 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:32,435 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:32,440 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:32,441 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:32,446 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:32,448 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:32,455 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:47:32,456 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1658446367] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:32,456 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:47:32,456 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-02 12:47:32,456 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2080102285] [2021-05-02 12:47:32,456 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 12:47:32,456 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:47:32,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 12:47:32,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 12:47:32,457 INFO L87 Difference]: Start difference. First operand 120 states and 146 transitions. Second operand has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:47:32,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:47:32,525 INFO L93 Difference]: Finished difference Result 251 states and 309 transitions. [2021-05-02 12:47:32,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 12:47:32,526 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2021-05-02 12:47:32,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:47:32,528 INFO L225 Difference]: With dead ends: 251 [2021-05-02 12:47:32,528 INFO L226 Difference]: Without dead ends: 170 [2021-05-02 12:47:32,529 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 36.7ms TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 12:47:32,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2021-05-02 12:47:32,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 141. [2021-05-02 12:47:32,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 129 states have (on average 1.2325581395348837) internal successors, (159), 131 states have internal predecessors, (159), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 12:47:32,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 170 transitions. [2021-05-02 12:47:32,539 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 170 transitions. Word has length 26 [2021-05-02 12:47:32,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:47:32,539 INFO L480 AbstractCegarLoop]: Abstraction has 141 states and 170 transitions. [2021-05-02 12:47:32,539 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:47:32,539 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 170 transitions. [2021-05-02 12:47:32,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 12:47:32,540 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:47:32,540 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:47:32,752 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:47:32,753 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:47:32,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:47:32,754 INFO L82 PathProgramCache]: Analyzing trace with hash -1342841816, now seen corresponding path program 2 times [2021-05-02 12:47:32,754 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:47:32,754 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1042382577] [2021-05-02 12:47:32,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:47:32,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:32,817 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:47:32,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:32,831 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:47:32,831 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:47:32,831 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1042382577] [2021-05-02 12:47:32,832 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1042382577] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:32,832 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1290738468] [2021-05-02 12:47:32,832 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:47:32,877 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:47:32,877 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:47:32,878 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 12:47:32,879 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:47:32,934 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:32,935 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:32,940 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:32,979 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:32,986 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 12:47:32,986 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1290738468] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:32,986 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:47:32,986 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6] total 12 [2021-05-02 12:47:32,986 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [871249331] [2021-05-02 12:47:32,986 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 12:47:32,986 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:47:32,987 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 12:47:32,987 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=89, Unknown=0, NotChecked=0, Total=132 [2021-05-02 12:47:32,987 INFO L87 Difference]: Start difference. First operand 141 states and 170 transitions. Second operand has 12 states, 12 states have (on average 3.0) internal successors, (36), 11 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:47:33,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:47:33,190 INFO L93 Difference]: Finished difference Result 358 states and 442 transitions. [2021-05-02 12:47:33,190 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 12:47:33,191 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.0) internal successors, (36), 11 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2021-05-02 12:47:33,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:47:33,193 INFO L225 Difference]: With dead ends: 358 [2021-05-02 12:47:33,193 INFO L226 Difference]: Without dead ends: 265 [2021-05-02 12:47:33,195 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 116.7ms TimeCoverageRelationStatistics Valid=102, Invalid=240, Unknown=0, NotChecked=0, Total=342 [2021-05-02 12:47:33,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 265 states. [2021-05-02 12:47:33,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 265 to 156. [2021-05-02 12:47:33,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 156 states, 144 states have (on average 1.2291666666666667) internal successors, (177), 146 states have internal predecessors, (177), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 12:47:33,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 188 transitions. [2021-05-02 12:47:33,219 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 188 transitions. Word has length 29 [2021-05-02 12:47:33,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:47:33,220 INFO L480 AbstractCegarLoop]: Abstraction has 156 states and 188 transitions. [2021-05-02 12:47:33,220 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 3.0) internal successors, (36), 11 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:47:33,220 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 188 transitions. [2021-05-02 12:47:33,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 12:47:33,226 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:47:33,226 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:47:33,432 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 12:47:33,433 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:47:33,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:47:33,433 INFO L82 PathProgramCache]: Analyzing trace with hash 937197895, now seen corresponding path program 3 times [2021-05-02 12:47:33,433 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:47:33,433 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2057457815] [2021-05-02 12:47:33,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:47:33,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:33,527 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:47:33,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:33,549 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:47:33,549 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:47:33,549 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2057457815] [2021-05-02 12:47:33,549 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2057457815] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:33,549 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [783328607] [2021-05-02 12:47:33,549 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 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:47:33,590 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 12:47:33,590 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:47:33,591 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 12:47:33,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:47:33,658 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 12:47:33,659 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [783328607] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 12:47:33,659 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 12:47:33,659 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [10] total 12 [2021-05-02 12:47:33,659 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1514242695] [2021-05-02 12:47:33,660 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 12:47:33,660 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:47:33,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 12:47:33,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2021-05-02 12:47:33,661 INFO L87 Difference]: Start difference. First operand 156 states and 188 transitions. Second operand has 4 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:47:33,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:47:33,707 INFO L93 Difference]: Finished difference Result 280 states and 339 transitions. [2021-05-02 12:47:33,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 12:47:33,707 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2021-05-02 12:47:33,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:47:33,708 INFO L225 Difference]: With dead ends: 280 [2021-05-02 12:47:33,708 INFO L226 Difference]: Without dead ends: 194 [2021-05-02 12:47:33,709 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 67.7ms TimeCoverageRelationStatistics Valid=46, Invalid=110, Unknown=0, NotChecked=0, Total=156 [2021-05-02 12:47:33,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2021-05-02 12:47:33,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 162. [2021-05-02 12:47:33,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 150 states have (on average 1.22) internal successors, (183), 152 states have internal predecessors, (183), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 12:47:33,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 194 transitions. [2021-05-02 12:47:33,717 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 194 transitions. Word has length 32 [2021-05-02 12:47:33,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:47:33,717 INFO L480 AbstractCegarLoop]: Abstraction has 162 states and 194 transitions. [2021-05-02 12:47:33,717 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:47:33,717 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 194 transitions. [2021-05-02 12:47:33,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 12:47:33,718 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:47:33,718 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:47:33,928 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:47:33,929 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:47:33,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:47:33,930 INFO L82 PathProgramCache]: Analyzing trace with hash -1737005181, now seen corresponding path program 4 times [2021-05-02 12:47:33,930 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:47:33,930 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1269237236] [2021-05-02 12:47:33,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:47:33,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:34,005 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:47:34,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:34,013 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:47:34,013 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:47:34,013 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1269237236] [2021-05-02 12:47:34,013 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1269237236] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:34,013 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2106693164] [2021-05-02 12:47:34,013 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:47:34,056 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:47:34,057 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:47:34,057 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-02 12:47:34,058 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:47:34,086 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:34,089 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:34,095 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:34,105 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:34,110 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:34,111 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:34,116 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:34,117 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:34,122 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:34,123 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:34,130 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:34,131 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:34,143 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:47:34,144 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2106693164] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:34,144 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:47:34,144 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2021-05-02 12:47:34,144 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1166510444] [2021-05-02 12:47:34,145 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 12:47:34,145 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:47:34,146 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 12:47:34,146 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2021-05-02 12:47:34,147 INFO L87 Difference]: Start difference. First operand 162 states and 194 transitions. Second operand has 11 states, 11 states have (on average 3.0) internal successors, (33), 10 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:47:34,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:47:34,202 INFO L93 Difference]: Finished difference Result 353 states and 422 transitions. [2021-05-02 12:47:34,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 12:47:34,202 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.0) internal successors, (33), 10 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2021-05-02 12:47:34,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:47:34,205 INFO L225 Difference]: With dead ends: 353 [2021-05-02 12:47:34,205 INFO L226 Difference]: Without dead ends: 247 [2021-05-02 12:47:34,206 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 56.1ms TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2021-05-02 12:47:34,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2021-05-02 12:47:34,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 183. [2021-05-02 12:47:34,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 183 states, 171 states have (on average 1.2105263157894737) internal successors, (207), 173 states have internal predecessors, (207), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 12:47:34,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 218 transitions. [2021-05-02 12:47:34,216 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 218 transitions. Word has length 32 [2021-05-02 12:47:34,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:47:34,216 INFO L480 AbstractCegarLoop]: Abstraction has 183 states and 218 transitions. [2021-05-02 12:47:34,217 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.0) internal successors, (33), 10 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:47:34,217 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 218 transitions. [2021-05-02 12:47:34,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 12:47:34,218 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:47:34,218 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:47:34,435 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:47:34,436 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:47:34,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:47:34,436 INFO L82 PathProgramCache]: Analyzing trace with hash -1981761020, now seen corresponding path program 5 times [2021-05-02 12:47:34,437 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:47:34,437 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [719335338] [2021-05-02 12:47:34,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:47:34,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:34,592 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:47:34,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:34,597 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:47:34,598 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:47:34,598 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [719335338] [2021-05-02 12:47:34,598 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [719335338] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:34,598 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1820460797] [2021-05-02 12:47:34,598 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:47:34,643 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2021-05-02 12:47:34,643 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:47:34,644 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 12:47:34,645 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:47:34,664 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:34,668 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:34,675 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:34,676 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:34,683 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:34,686 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:34,700 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:34,702 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:34,708 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:34,709 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:34,715 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:34,716 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:34,721 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:34,723 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:34,732 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:47:34,732 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1820460797] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:34,732 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:47:34,732 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2021-05-02 12:47:34,732 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1522704568] [2021-05-02 12:47:34,733 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 12:47:34,733 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:47:34,733 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 12:47:34,733 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2021-05-02 12:47:34,734 INFO L87 Difference]: Start difference. First operand 183 states and 218 transitions. Second operand has 12 states, 12 states have (on average 3.0) internal successors, (36), 11 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:47:34,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:47:34,831 INFO L93 Difference]: Finished difference Result 386 states and 460 transitions. [2021-05-02 12:47:34,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 12:47:34,831 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.0) internal successors, (36), 11 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2021-05-02 12:47:34,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:47:34,833 INFO L225 Difference]: With dead ends: 386 [2021-05-02 12:47:34,833 INFO L226 Difference]: Without dead ends: 268 [2021-05-02 12:47:34,833 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 64.4ms TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2021-05-02 12:47:34,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2021-05-02 12:47:34,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 204. [2021-05-02 12:47:34,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 204 states, 192 states have (on average 1.203125) internal successors, (231), 194 states have internal predecessors, (231), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 12:47:34,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 242 transitions. [2021-05-02 12:47:34,843 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 242 transitions. Word has length 35 [2021-05-02 12:47:34,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:47:34,843 INFO L480 AbstractCegarLoop]: Abstraction has 204 states and 242 transitions. [2021-05-02 12:47:34,843 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 3.0) internal successors, (36), 11 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:47:34,843 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 242 transitions. [2021-05-02 12:47:34,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 12:47:34,843 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:47:34,843 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:47:35,061 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 12:47:35,061 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:47:35,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:47:35,061 INFO L82 PathProgramCache]: Analyzing trace with hash -648492061, now seen corresponding path program 6 times [2021-05-02 12:47:35,062 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:47:35,062 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [700481782] [2021-05-02 12:47:35,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:47:35,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:35,144 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:47:35,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:35,152 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:47:35,152 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:47:35,152 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [700481782] [2021-05-02 12:47:35,152 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [700481782] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:35,152 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [701349659] [2021-05-02 12:47:35,152 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:47:35,195 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-05-02 12:47:35,195 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:47:35,196 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 12:47:35,197 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:47:35,268 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:35,302 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:35,321 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:35,322 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:35,326 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:35,349 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-05-02 12:47:35,349 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [701349659] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 12:47:35,350 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 12:47:35,350 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [12] total 19 [2021-05-02 12:47:35,350 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1753616988] [2021-05-02 12:47:35,350 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 12:47:35,350 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:47:35,351 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 12:47:35,351 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=267, Unknown=0, NotChecked=0, Total=342 [2021-05-02 12:47:35,351 INFO L87 Difference]: Start difference. First operand 204 states and 242 transitions. Second operand has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 8 states have internal predecessors, (16), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:47:35,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:47:35,420 INFO L93 Difference]: Finished difference Result 213 states and 251 transitions. [2021-05-02 12:47:35,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 12:47:35,420 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 8 states have internal predecessors, (16), 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 38 [2021-05-02 12:47:35,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:47:35,422 INFO L225 Difference]: With dead ends: 213 [2021-05-02 12:47:35,422 INFO L226 Difference]: Without dead ends: 211 [2021-05-02 12:47:35,423 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 144.1ms TimeCoverageRelationStatistics Valid=84, Invalid=336, Unknown=0, NotChecked=0, Total=420 [2021-05-02 12:47:35,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2021-05-02 12:47:35,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 204. [2021-05-02 12:47:35,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 204 states, 192 states have (on average 1.203125) internal successors, (231), 194 states have internal predecessors, (231), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 12:47:35,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 242 transitions. [2021-05-02 12:47:35,435 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 242 transitions. Word has length 38 [2021-05-02 12:47:35,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:47:35,435 INFO L480 AbstractCegarLoop]: Abstraction has 204 states and 242 transitions. [2021-05-02 12:47:35,435 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 8 states have internal predecessors, (16), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:47:35,436 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 242 transitions. [2021-05-02 12:47:35,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 12:47:35,436 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:47:35,436 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:47:35,649 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 12:47:35,649 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:47:35,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:47:35,649 INFO L82 PathProgramCache]: Analyzing trace with hash 86977569, now seen corresponding path program 1 times [2021-05-02 12:47:35,650 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:47:35,650 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1769812818] [2021-05-02 12:47:35,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:47:35,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:35,686 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:47:35,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:35,691 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2021-05-02 12:47:35,691 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:47:35,691 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1769812818] [2021-05-02 12:47:35,691 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1769812818] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 12:47:35,691 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 12:47:35,691 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 12:47:35,691 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [576170930] [2021-05-02 12:47:35,692 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 12:47:35,692 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:47:35,692 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 12:47:35,692 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 12:47:35,692 INFO L87 Difference]: Start difference. First operand 204 states and 242 transitions. Second operand has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:47:35,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:47:35,748 INFO L93 Difference]: Finished difference Result 324 states and 389 transitions. [2021-05-02 12:47:35,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 12:47:35,749 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2021-05-02 12:47:35,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:47:35,750 INFO L225 Difference]: With dead ends: 324 [2021-05-02 12:47:35,750 INFO L226 Difference]: Without dead ends: 211 [2021-05-02 12:47:35,751 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 15.2ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 12:47:35,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2021-05-02 12:47:35,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 200. [2021-05-02 12:47:35,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 200 states, 188 states have (on average 1.196808510638298) internal successors, (225), 190 states have internal predecessors, (225), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 12:47:35,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 236 transitions. [2021-05-02 12:47:35,760 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 236 transitions. Word has length 38 [2021-05-02 12:47:35,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:47:35,760 INFO L480 AbstractCegarLoop]: Abstraction has 200 states and 236 transitions. [2021-05-02 12:47:35,760 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:47:35,760 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 236 transitions. [2021-05-02 12:47:35,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-05-02 12:47:35,761 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:47:35,761 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 14, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:47:35,761 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-05-02 12:47:35,761 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:47:35,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:47:35,762 INFO L82 PathProgramCache]: Analyzing trace with hash 389678656, now seen corresponding path program 1 times [2021-05-02 12:47:35,762 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:47:35,762 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1100744585] [2021-05-02 12:47:35,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:47:35,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:35,860 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:47:35,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:35,869 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 34 [2021-05-02 12:47:35,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:35,871 INFO L134 CoverageAnalysis]: Checked inductivity of 399 backedges. 212 proven. 92 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2021-05-02 12:47:35,871 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:47:35,871 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1100744585] [2021-05-02 12:47:35,871 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1100744585] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:35,871 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1187605274] [2021-05-02 12:47:35,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:47:35,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:35,928 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 12:47:35,930 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:47:35,950 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:35,952 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:35,957 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:35,958 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:35,964 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:35,966 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:35,970 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:35,971 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:35,975 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:35,976 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:35,981 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:35,982 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:35,992 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:35,994 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:35,998 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:36,000 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:36,032 INFO L134 CoverageAnalysis]: Checked inductivity of 399 backedges. 210 proven. 92 refuted. 0 times theorem prover too weak. 97 trivial. 0 not checked. [2021-05-02 12:47:36,033 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1187605274] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:36,033 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:47:36,033 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2021-05-02 12:47:36,033 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [390719085] [2021-05-02 12:47:36,033 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 12:47:36,033 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:47:36,034 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 12:47:36,034 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2021-05-02 12:47:36,034 INFO L87 Difference]: Start difference. First operand 200 states and 236 transitions. Second operand has 13 states, 13 states have (on average 3.8461538461538463) internal successors, (50), 12 states have internal predecessors, (50), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 12:47:36,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:47:36,095 INFO L93 Difference]: Finished difference Result 411 states and 486 transitions. [2021-05-02 12:47:36,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 12:47:36,095 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.8461538461538463) internal successors, (50), 12 states have internal predecessors, (50), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 71 [2021-05-02 12:47:36,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:47:36,096 INFO L225 Difference]: With dead ends: 411 [2021-05-02 12:47:36,096 INFO L226 Difference]: Without dead ends: 285 [2021-05-02 12:47:36,097 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 69.9ms TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2021-05-02 12:47:36,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 285 states. [2021-05-02 12:47:36,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 285 to 221. [2021-05-02 12:47:36,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 221 states, 209 states have (on average 1.1913875598086126) internal successors, (249), 211 states have internal predecessors, (249), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 12:47:36,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 221 states to 221 states and 260 transitions. [2021-05-02 12:47:36,107 INFO L78 Accepts]: Start accepts. Automaton has 221 states and 260 transitions. Word has length 71 [2021-05-02 12:47:36,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:47:36,107 INFO L480 AbstractCegarLoop]: Abstraction has 221 states and 260 transitions. [2021-05-02 12:47:36,107 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 3.8461538461538463) internal successors, (50), 12 states have internal predecessors, (50), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 12:47:36,107 INFO L276 IsEmpty]: Start isEmpty. Operand 221 states and 260 transitions. [2021-05-02 12:47:36,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-02 12:47:36,108 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:47:36,108 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 16, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:47:36,321 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 12:47:36,321 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:47:36,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:47:36,321 INFO L82 PathProgramCache]: Analyzing trace with hash 1130708772, now seen corresponding path program 2 times [2021-05-02 12:47:36,321 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:47:36,321 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1011581538] [2021-05-02 12:47:36,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:47:36,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:36,417 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:47:36,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:36,421 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-05-02 12:47:36,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:36,423 INFO L134 CoverageAnalysis]: Checked inductivity of 502 backedges. 265 proven. 117 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-05-02 12:47:36,424 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:47:36,424 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1011581538] [2021-05-02 12:47:36,424 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1011581538] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:36,424 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1283490037] [2021-05-02 12:47:36,424 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:47:36,486 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:47:36,487 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:47:36,487 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 12:47:36,489 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:47:36,507 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:36,508 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:36,515 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:36,517 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:36,521 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:36,522 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:36,526 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:36,528 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:36,532 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:36,533 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:36,538 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:36,539 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:36,543 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:36,545 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:36,549 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:36,550 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:36,555 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:36,556 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:36,597 INFO L134 CoverageAnalysis]: Checked inductivity of 502 backedges. 263 proven. 117 refuted. 0 times theorem prover too weak. 122 trivial. 0 not checked. [2021-05-02 12:47:36,597 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1283490037] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:36,598 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:47:36,598 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2021-05-02 12:47:36,598 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1543272053] [2021-05-02 12:47:36,598 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 12:47:36,598 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:47:36,599 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 12:47:36,599 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2021-05-02 12:47:36,599 INFO L87 Difference]: Start difference. First operand 221 states and 260 transitions. Second operand has 14 states, 14 states have (on average 3.7857142857142856) internal successors, (53), 13 states have internal predecessors, (53), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 12:47:36,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:47:36,694 INFO L93 Difference]: Finished difference Result 444 states and 524 transitions. [2021-05-02 12:47:36,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 12:47:36,694 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.7857142857142856) internal successors, (53), 13 states have internal predecessors, (53), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 77 [2021-05-02 12:47:36,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:47:36,695 INFO L225 Difference]: With dead ends: 444 [2021-05-02 12:47:36,696 INFO L226 Difference]: Without dead ends: 306 [2021-05-02 12:47:36,696 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 73.5ms TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2021-05-02 12:47:36,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 306 states. [2021-05-02 12:47:36,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 306 to 242. [2021-05-02 12:47:36,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 242 states, 230 states have (on average 1.1869565217391305) internal successors, (273), 232 states have internal predecessors, (273), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 12:47:36,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 242 states to 242 states and 284 transitions. [2021-05-02 12:47:36,707 INFO L78 Accepts]: Start accepts. Automaton has 242 states and 284 transitions. Word has length 77 [2021-05-02 12:47:36,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:47:36,707 INFO L480 AbstractCegarLoop]: Abstraction has 242 states and 284 transitions. [2021-05-02 12:47:36,707 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 3.7857142857142856) internal successors, (53), 13 states have internal predecessors, (53), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 12:47:36,707 INFO L276 IsEmpty]: Start isEmpty. Operand 242 states and 284 transitions. [2021-05-02 12:47:36,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-02 12:47:36,708 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:47:36,708 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 18, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:47:36,921 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:47:36,921 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:47:36,922 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:47:36,922 INFO L82 PathProgramCache]: Analyzing trace with hash 1110186496, now seen corresponding path program 3 times [2021-05-02 12:47:36,922 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:47:36,922 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [276252005] [2021-05-02 12:47:36,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:47:36,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:37,058 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:47:37,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:37,074 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-05-02 12:47:37,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:37,085 INFO L134 CoverageAnalysis]: Checked inductivity of 617 backedges. 324 proven. 145 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2021-05-02 12:47:37,085 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:47:37,086 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [276252005] [2021-05-02 12:47:37,086 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [276252005] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:37,086 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2070257294] [2021-05-02 12:47:37,086 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:47:37,131 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 12:47:37,131 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:47:37,132 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 12:47:37,137 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:47:37,293 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:37,294 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:37,345 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:37,347 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:37,350 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:37,376 INFO L134 CoverageAnalysis]: Checked inductivity of 617 backedges. 30 proven. 325 refuted. 0 times theorem prover too weak. 262 trivial. 0 not checked. [2021-05-02 12:47:37,377 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2070257294] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:37,377 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:47:37,377 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 10] total 22 [2021-05-02 12:47:37,377 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [481500241] [2021-05-02 12:47:37,377 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 12:47:37,377 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:47:37,378 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 12:47:37,378 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=361, Unknown=0, NotChecked=0, Total=462 [2021-05-02 12:47:37,379 INFO L87 Difference]: Start difference. First operand 242 states and 284 transitions. Second operand has 22 states, 22 states have (on average 3.272727272727273) internal successors, (72), 20 states have internal predecessors, (72), 4 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 12:47:37,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:47:37,996 INFO L93 Difference]: Finished difference Result 690 states and 818 transitions. [2021-05-02 12:47:37,996 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-02 12:47:37,996 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 3.272727272727273) internal successors, (72), 20 states have internal predecessors, (72), 4 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 83 [2021-05-02 12:47:37,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:47:37,998 INFO L225 Difference]: With dead ends: 690 [2021-05-02 12:47:37,998 INFO L226 Difference]: Without dead ends: 540 [2021-05-02 12:47:38,000 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 417 ImplicationChecksByTransitivity, 492.7ms TimeCoverageRelationStatistics Valid=441, Invalid=1629, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 12:47:38,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 540 states. [2021-05-02 12:47:38,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 540 to 422. [2021-05-02 12:47:38,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 422 states, 405 states have (on average 1.1876543209876542) internal successors, (481), 408 states have internal predecessors, (481), 9 states have call successors, (9), 8 states have call predecessors, (9), 7 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 12:47:38,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 422 states to 422 states and 498 transitions. [2021-05-02 12:47:38,019 INFO L78 Accepts]: Start accepts. Automaton has 422 states and 498 transitions. Word has length 83 [2021-05-02 12:47:38,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:47:38,019 INFO L480 AbstractCegarLoop]: Abstraction has 422 states and 498 transitions. [2021-05-02 12:47:38,019 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 3.272727272727273) internal successors, (72), 20 states have internal predecessors, (72), 4 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 12:47:38,019 INFO L276 IsEmpty]: Start isEmpty. Operand 422 states and 498 transitions. [2021-05-02 12:47:38,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-05-02 12:47:38,021 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:47:38,021 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 20, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:47:38,236 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:47:38,237 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:47:38,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:47:38,238 INFO L82 PathProgramCache]: Analyzing trace with hash -1885082458, now seen corresponding path program 1 times [2021-05-02 12:47:38,238 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:47:38,238 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1744848257] [2021-05-02 12:47:38,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:47:38,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:38,356 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:47:38,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:38,365 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2021-05-02 12:47:38,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:38,369 INFO L134 CoverageAnalysis]: Checked inductivity of 744 backedges. 391 proven. 176 refuted. 0 times theorem prover too weak. 177 trivial. 0 not checked. [2021-05-02 12:47:38,369 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:47:38,369 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1744848257] [2021-05-02 12:47:38,369 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1744848257] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:38,369 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1355702356] [2021-05-02 12:47:38,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:47:38,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:38,421 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 12:47:38,423 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:47:38,438 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:38,440 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:38,444 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:38,446 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:38,450 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:38,452 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:38,456 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:38,457 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:38,464 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:38,465 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:38,470 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:38,471 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:38,476 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:38,477 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:38,482 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:38,483 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:38,489 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:38,490 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:38,495 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:38,496 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:38,501 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:38,503 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:38,543 INFO L134 CoverageAnalysis]: Checked inductivity of 744 backedges. 387 proven. 176 refuted. 0 times theorem prover too weak. 181 trivial. 0 not checked. [2021-05-02 12:47:38,543 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1355702356] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:38,544 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:47:38,544 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2021-05-02 12:47:38,544 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1895877334] [2021-05-02 12:47:38,544 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 12:47:38,544 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:47:38,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 12:47:38,545 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2021-05-02 12:47:38,545 INFO L87 Difference]: Start difference. First operand 422 states and 498 transitions. Second operand has 16 states, 16 states have (on average 4.3125) internal successors, (69), 15 states have internal predecessors, (69), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 12:47:38,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:47:38,688 INFO L93 Difference]: Finished difference Result 870 states and 1024 transitions. [2021-05-02 12:47:38,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 12:47:38,689 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 4.3125) internal successors, (69), 15 states have internal predecessors, (69), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 89 [2021-05-02 12:47:38,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:47:38,691 INFO L225 Difference]: With dead ends: 870 [2021-05-02 12:47:38,691 INFO L226 Difference]: Without dead ends: 549 [2021-05-02 12:47:38,692 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 87.9ms TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2021-05-02 12:47:38,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 549 states. [2021-05-02 12:47:38,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 549 to 443. [2021-05-02 12:47:38,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 443 states, 426 states have (on average 1.1854460093896713) internal successors, (505), 429 states have internal predecessors, (505), 9 states have call successors, (9), 8 states have call predecessors, (9), 7 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 12:47:38,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 443 states to 443 states and 522 transitions. [2021-05-02 12:47:38,710 INFO L78 Accepts]: Start accepts. Automaton has 443 states and 522 transitions. Word has length 89 [2021-05-02 12:47:38,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:47:38,710 INFO L480 AbstractCegarLoop]: Abstraction has 443 states and 522 transitions. [2021-05-02 12:47:38,710 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 4.3125) internal successors, (69), 15 states have internal predecessors, (69), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 12:47:38,711 INFO L276 IsEmpty]: Start isEmpty. Operand 443 states and 522 transitions. [2021-05-02 12:47:38,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-05-02 12:47:38,712 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:47:38,712 INFO L523 BasicCegarLoop]: trace histogram [24, 24, 22, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:47:38,924 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:47:38,925 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:47:38,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:47:38,925 INFO L82 PathProgramCache]: Analyzing trace with hash 696975166, now seen corresponding path program 2 times [2021-05-02 12:47:38,925 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:47:38,925 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1309948458] [2021-05-02 12:47:38,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:47:38,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:39,051 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:47:39,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:39,058 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2021-05-02 12:47:39,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:39,060 INFO L134 CoverageAnalysis]: Checked inductivity of 883 backedges. 460 proven. 210 refuted. 0 times theorem prover too weak. 213 trivial. 0 not checked. [2021-05-02 12:47:39,060 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:47:39,060 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1309948458] [2021-05-02 12:47:39,060 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1309948458] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:39,060 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2101481104] [2021-05-02 12:47:39,060 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 [2021-05-02 12:47:39,115 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:47:39,115 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:47:39,116 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 12:47:39,118 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:47:39,136 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:39,141 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:39,145 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:39,147 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:39,150 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:39,250 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:39,257 INFO L134 CoverageAnalysis]: Checked inductivity of 883 backedges. 6 proven. 183 refuted. 0 times theorem prover too weak. 694 trivial. 0 not checked. [2021-05-02 12:47:39,257 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2101481104] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:39,257 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:47:39,257 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 7] total 19 [2021-05-02 12:47:39,257 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1942624437] [2021-05-02 12:47:39,259 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 12:47:39,259 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:47:39,260 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 12:47:39,260 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=215, Unknown=0, NotChecked=0, Total=342 [2021-05-02 12:47:39,260 INFO L87 Difference]: Start difference. First operand 443 states and 522 transitions. Second operand has 19 states, 19 states have (on average 3.9473684210526314) internal successors, (75), 18 states have internal predecessors, (75), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 12:47:39,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:47:39,623 INFO L93 Difference]: Finished difference Result 1494 states and 1726 transitions. [2021-05-02 12:47:39,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-02 12:47:39,624 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.9473684210526314) internal successors, (75), 18 states have internal predecessors, (75), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 95 [2021-05-02 12:47:39,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:47:39,630 INFO L225 Difference]: With dead ends: 1494 [2021-05-02 12:47:39,630 INFO L226 Difference]: Without dead ends: 1161 [2021-05-02 12:47:39,632 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 165 ImplicationChecksByTransitivity, 257.2ms TimeCoverageRelationStatistics Valid=340, Invalid=716, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 12:47:39,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1161 states. [2021-05-02 12:47:39,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1161 to 467. [2021-05-02 12:47:39,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 467 states, 450 states have (on average 1.1866666666666668) internal successors, (534), 453 states have internal predecessors, (534), 9 states have call successors, (9), 8 states have call predecessors, (9), 7 states have return successors, (8), 5 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 12:47:39,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 467 states to 467 states and 551 transitions. [2021-05-02 12:47:39,661 INFO L78 Accepts]: Start accepts. Automaton has 467 states and 551 transitions. Word has length 95 [2021-05-02 12:47:39,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:47:39,661 INFO L480 AbstractCegarLoop]: Abstraction has 467 states and 551 transitions. [2021-05-02 12:47:39,661 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 3.9473684210526314) internal successors, (75), 18 states have internal predecessors, (75), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 12:47:39,661 INFO L276 IsEmpty]: Start isEmpty. Operand 467 states and 551 transitions. [2021-05-02 12:47:39,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-05-02 12:47:39,662 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:47:39,662 INFO L523 BasicCegarLoop]: trace histogram [26, 26, 24, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:47:39,876 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-05-02 12:47:39,877 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:47:39,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:47:39,877 INFO L82 PathProgramCache]: Analyzing trace with hash 1781723818, now seen corresponding path program 3 times [2021-05-02 12:47:39,877 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:47:39,877 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1514025198] [2021-05-02 12:47:39,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:47:39,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:40,009 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:47:40,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:40,014 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49 [2021-05-02 12:47:40,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:40,017 INFO L134 CoverageAnalysis]: Checked inductivity of 1034 backedges. 537 proven. 247 refuted. 0 times theorem prover too weak. 250 trivial. 0 not checked. [2021-05-02 12:47:40,017 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:47:40,017 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1514025198] [2021-05-02 12:47:40,017 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1514025198] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:40,017 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1822431055] [2021-05-02 12:47:40,017 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 [2021-05-02 12:47:40,059 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 12:47:40,060 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:47:40,060 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 12:47:40,062 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:47:40,142 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:40,143 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:40,172 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:40,269 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:40,311 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:40,318 INFO L134 CoverageAnalysis]: Checked inductivity of 1034 backedges. 575 proven. 27 refuted. 0 times theorem prover too weak. 432 trivial. 0 not checked. [2021-05-02 12:47:40,319 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1822431055] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:40,319 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:47:40,319 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 11] total 26 [2021-05-02 12:47:40,319 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1872357907] [2021-05-02 12:47:40,319 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 12:47:40,319 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:47:40,319 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 12:47:40,320 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=502, Unknown=0, NotChecked=0, Total=650 [2021-05-02 12:47:40,320 INFO L87 Difference]: Start difference. First operand 467 states and 551 transitions. Second operand has 26 states, 26 states have (on average 3.1538461538461537) internal successors, (82), 25 states have internal predecessors, (82), 3 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 12:47:43,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:47:43,748 INFO L93 Difference]: Finished difference Result 1708 states and 1977 transitions. [2021-05-02 12:47:43,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 137 states. [2021-05-02 12:47:43,749 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 3.1538461538461537) internal successors, (82), 25 states have internal predecessors, (82), 3 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 101 [2021-05-02 12:47:43,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:47:43,753 INFO L225 Difference]: With dead ends: 1708 [2021-05-02 12:47:43,753 INFO L226 Difference]: Without dead ends: 1357 [2021-05-02 12:47:43,759 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 99 SyntacticMatches, 0 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9033 ImplicationChecksByTransitivity, 3032.2ms TimeCoverageRelationStatistics Valid=4172, Invalid=19390, Unknown=0, NotChecked=0, Total=23562 [2021-05-02 12:47:43,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1357 states. [2021-05-02 12:47:43,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1357 to 657. [2021-05-02 12:47:43,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 657 states, 631 states have (on average 1.2060221870047543) internal successors, (761), 638 states have internal predecessors, (761), 15 states have call successors, (15), 11 states have call predecessors, (15), 10 states have return successors, (14), 7 states have call predecessors, (14), 14 states have call successors, (14) [2021-05-02 12:47:43,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 657 states to 657 states and 790 transitions. [2021-05-02 12:47:43,802 INFO L78 Accepts]: Start accepts. Automaton has 657 states and 790 transitions. Word has length 101 [2021-05-02 12:47:43,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:47:43,802 INFO L480 AbstractCegarLoop]: Abstraction has 657 states and 790 transitions. [2021-05-02 12:47:43,803 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 3.1538461538461537) internal successors, (82), 25 states have internal predecessors, (82), 3 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 12:47:43,803 INFO L276 IsEmpty]: Start isEmpty. Operand 657 states and 790 transitions. [2021-05-02 12:47:43,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-05-02 12:47:43,804 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:47:43,804 INFO L523 BasicCegarLoop]: trace histogram [29, 29, 28, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:47:44,021 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-02 12:47:44,022 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:47:44,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:47:44,022 INFO L82 PathProgramCache]: Analyzing trace with hash -1645472033, now seen corresponding path program 4 times [2021-05-02 12:47:44,022 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:47:44,022 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1692539886] [2021-05-02 12:47:44,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:47:44,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:44,166 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:47:44,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:44,171 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55 [2021-05-02 12:47:44,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:44,174 INFO L134 CoverageAnalysis]: Checked inductivity of 1283 backedges. 665 proven. 287 refuted. 0 times theorem prover too weak. 331 trivial. 0 not checked. [2021-05-02 12:47:44,174 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:47:44,174 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1692539886] [2021-05-02 12:47:44,174 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1692539886] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:44,174 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1691719077] [2021-05-02 12:47:44,174 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 [2021-05-02 12:47:44,253 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:47:44,253 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:47:44,254 INFO L263 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 12:47:44,256 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:47:44,270 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:44,271 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:44,276 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:44,277 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:44,280 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:44,281 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:44,285 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:44,286 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:44,289 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:44,291 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:44,294 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:44,295 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:44,308 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:44,309 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:44,313 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:44,315 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:44,318 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:44,319 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:44,324 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:44,325 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:44,333 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:44,335 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:44,340 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:44,341 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:44,345 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:44,346 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:44,351 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:44,352 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:44,356 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:44,357 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:44,412 INFO L134 CoverageAnalysis]: Checked inductivity of 1283 backedges. 661 proven. 330 refuted. 0 times theorem prover too weak. 292 trivial. 0 not checked. [2021-05-02 12:47:44,412 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1691719077] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:44,412 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:47:44,413 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 20 [2021-05-02 12:47:44,413 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1351148477] [2021-05-02 12:47:44,414 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 12:47:44,414 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:47:44,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 12:47:44,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2021-05-02 12:47:44,415 INFO L87 Difference]: Start difference. First operand 657 states and 790 transitions. Second operand has 20 states, 20 states have (on average 4.0) internal successors, (80), 19 states have internal predecessors, (80), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 12:47:44,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:47:44,649 INFO L93 Difference]: Finished difference Result 1671 states and 1950 transitions. [2021-05-02 12:47:44,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 12:47:44,649 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 4.0) internal successors, (80), 19 states have internal predecessors, (80), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 110 [2021-05-02 12:47:44,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:47:44,653 INFO L225 Difference]: With dead ends: 1671 [2021-05-02 12:47:44,653 INFO L226 Difference]: Without dead ends: 1149 [2021-05-02 12:47:44,656 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 128.5ms TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2021-05-02 12:47:44,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1149 states. [2021-05-02 12:47:44,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1149 to 708. [2021-05-02 12:47:44,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 708 states, 682 states have (on average 1.2008797653958945) internal successors, (819), 689 states have internal predecessors, (819), 15 states have call successors, (15), 11 states have call predecessors, (15), 10 states have return successors, (14), 7 states have call predecessors, (14), 14 states have call successors, (14) [2021-05-02 12:47:44,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 708 states to 708 states and 848 transitions. [2021-05-02 12:47:44,700 INFO L78 Accepts]: Start accepts. Automaton has 708 states and 848 transitions. Word has length 110 [2021-05-02 12:47:44,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:47:44,700 INFO L480 AbstractCegarLoop]: Abstraction has 708 states and 848 transitions. [2021-05-02 12:47:44,700 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 4.0) internal successors, (80), 19 states have internal predecessors, (80), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 12:47:44,700 INFO L276 IsEmpty]: Start isEmpty. Operand 708 states and 848 transitions. [2021-05-02 12:47:44,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2021-05-02 12:47:44,701 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:47:44,701 INFO L523 BasicCegarLoop]: trace histogram [32, 32, 30, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:47:44,919 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-05-02 12:47:44,920 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:47:44,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:47:44,920 INFO L82 PathProgramCache]: Analyzing trace with hash 1439463682, now seen corresponding path program 5 times [2021-05-02 12:47:44,920 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:47:44,921 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [705654029] [2021-05-02 12:47:44,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:47:44,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:45,096 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:47:45,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:45,100 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 58 [2021-05-02 12:47:45,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:45,103 INFO L134 CoverageAnalysis]: Checked inductivity of 1559 backedges. 806 proven. 376 refuted. 0 times theorem prover too weak. 377 trivial. 0 not checked. [2021-05-02 12:47:45,103 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:47:45,103 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [705654029] [2021-05-02 12:47:45,103 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [705654029] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:45,103 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1822822365] [2021-05-02 12:47:45,103 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 [2021-05-02 12:47:45,166 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 17 check-sat command(s) [2021-05-02 12:47:45,166 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:47:45,167 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 12:47:45,169 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:47:45,183 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:45,184 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:45,188 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:45,189 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:45,193 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:45,194 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:45,198 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:45,199 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:45,203 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:45,204 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:45,208 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:45,209 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:45,213 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:45,214 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:45,218 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:45,219 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:45,224 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:45,225 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:45,228 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:45,229 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:45,233 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:45,234 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:45,238 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:45,239 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:45,243 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:45,244 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:45,248 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:45,249 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:45,253 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:45,254 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:45,258 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:45,259 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:45,316 INFO L134 CoverageAnalysis]: Checked inductivity of 1559 backedges. 802 proven. 376 refuted. 0 times theorem prover too weak. 381 trivial. 0 not checked. [2021-05-02 12:47:45,317 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1822822365] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:45,317 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:47:45,317 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2021-05-02 12:47:45,317 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [361726156] [2021-05-02 12:47:45,319 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 12:47:45,319 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:47:45,319 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 12:47:45,319 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2021-05-02 12:47:45,319 INFO L87 Difference]: Start difference. First operand 708 states and 848 transitions. Second operand has 21 states, 21 states have (on average 4.0) internal successors, (84), 20 states have internal predecessors, (84), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 12:47:45,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:47:45,529 INFO L93 Difference]: Finished difference Result 1763 states and 2055 transitions. [2021-05-02 12:47:45,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 12:47:45,530 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 4.0) internal successors, (84), 20 states have internal predecessors, (84), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 119 [2021-05-02 12:47:45,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:47:45,533 INFO L225 Difference]: With dead ends: 1763 [2021-05-02 12:47:45,533 INFO L226 Difference]: Without dead ends: 1203 [2021-05-02 12:47:45,535 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 141.9ms TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2021-05-02 12:47:45,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1203 states. [2021-05-02 12:47:45,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1203 to 756. [2021-05-02 12:47:45,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 756 states, 730 states have (on average 1.1972602739726028) internal successors, (874), 737 states have internal predecessors, (874), 15 states have call successors, (15), 11 states have call predecessors, (15), 10 states have return successors, (14), 7 states have call predecessors, (14), 14 states have call successors, (14) [2021-05-02 12:47:45,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 756 states to 756 states and 903 transitions. [2021-05-02 12:47:45,580 INFO L78 Accepts]: Start accepts. Automaton has 756 states and 903 transitions. Word has length 119 [2021-05-02 12:47:45,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:47:45,580 INFO L480 AbstractCegarLoop]: Abstraction has 756 states and 903 transitions. [2021-05-02 12:47:45,580 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 4.0) internal successors, (84), 20 states have internal predecessors, (84), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 12:47:45,580 INFO L276 IsEmpty]: Start isEmpty. Operand 756 states and 903 transitions. [2021-05-02 12:47:45,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-05-02 12:47:45,581 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:47:45,582 INFO L523 BasicCegarLoop]: trace histogram [34, 34, 32, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:47:45,796 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-05-02 12:47:45,797 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:47:45,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:47:45,797 INFO L82 PathProgramCache]: Analyzing trace with hash -1882462746, now seen corresponding path program 6 times [2021-05-02 12:47:45,797 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:47:45,798 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2049146914] [2021-05-02 12:47:45,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:47:45,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:45,985 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:47:45,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:45,994 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 61 [2021-05-02 12:47:45,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:45,996 INFO L134 CoverageAnalysis]: Checked inductivity of 1758 backedges. 907 proven. 425 refuted. 0 times theorem prover too weak. 426 trivial. 0 not checked. [2021-05-02 12:47:45,997 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:47:45,997 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2049146914] [2021-05-02 12:47:45,997 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2049146914] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:45,997 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1161070400] [2021-05-02 12:47:45,997 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 [2021-05-02 12:47:46,066 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-05-02 12:47:46,066 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:47:46,067 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 12:47:46,068 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:47:46,138 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:46,168 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:46,225 INFO L134 CoverageAnalysis]: Checked inductivity of 1758 backedges. 941 proven. 0 refuted. 0 times theorem prover too weak. 817 trivial. 0 not checked. [2021-05-02 12:47:46,225 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1161070400] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 12:47:46,225 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 12:47:46,225 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [21] total 24 [2021-05-02 12:47:46,225 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2029927899] [2021-05-02 12:47:46,227 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 12:47:46,227 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:47:46,228 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 12:47:46,228 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=336, Unknown=0, NotChecked=0, Total=552 [2021-05-02 12:47:46,229 INFO L87 Difference]: Start difference. First operand 756 states and 903 transitions. Second operand has 5 states, 5 states have (on average 5.2) internal successors, (26), 5 states have internal predecessors, (26), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 12:47:46,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:47:46,313 INFO L93 Difference]: Finished difference Result 1155 states and 1382 transitions. [2021-05-02 12:47:46,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 12:47:46,313 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.2) internal successors, (26), 5 states have internal predecessors, (26), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 125 [2021-05-02 12:47:46,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:47:46,316 INFO L225 Difference]: With dead ends: 1155 [2021-05-02 12:47:46,316 INFO L226 Difference]: Without dead ends: 1043 [2021-05-02 12:47:46,317 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 187.9ms TimeCoverageRelationStatistics Valid=220, Invalid=380, Unknown=0, NotChecked=0, Total=600 [2021-05-02 12:47:46,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1043 states. [2021-05-02 12:47:46,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1043 to 1041. [2021-05-02 12:47:46,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1041 states, 1007 states have (on average 1.201588877855015) internal successors, (1210), 1015 states have internal predecessors, (1210), 19 states have call successors, (19), 15 states have call predecessors, (19), 14 states have return successors, (18), 10 states have call predecessors, (18), 18 states have call successors, (18) [2021-05-02 12:47:46,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1041 states to 1041 states and 1247 transitions. [2021-05-02 12:47:46,377 INFO L78 Accepts]: Start accepts. Automaton has 1041 states and 1247 transitions. Word has length 125 [2021-05-02 12:47:46,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:47:46,377 INFO L480 AbstractCegarLoop]: Abstraction has 1041 states and 1247 transitions. [2021-05-02 12:47:46,377 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 5.2) internal successors, (26), 5 states have internal predecessors, (26), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 12:47:46,377 INFO L276 IsEmpty]: Start isEmpty. Operand 1041 states and 1247 transitions. [2021-05-02 12:47:46,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-05-02 12:47:46,378 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:47:46,378 INFO L523 BasicCegarLoop]: trace histogram [34, 34, 32, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:47:46,592 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-05-02 12:47:46,592 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:47:46,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:47:46,593 INFO L82 PathProgramCache]: Analyzing trace with hash -1497564502, now seen corresponding path program 7 times [2021-05-02 12:47:46,593 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:47:46,593 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [74507116] [2021-05-02 12:47:46,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:47:46,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:46,789 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:47:46,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:46,797 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 61 [2021-05-02 12:47:46,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:46,800 INFO L134 CoverageAnalysis]: Checked inductivity of 1758 backedges. 905 proven. 425 refuted. 0 times theorem prover too weak. 428 trivial. 0 not checked. [2021-05-02 12:47:46,800 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:47:46,800 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [74507116] [2021-05-02 12:47:46,800 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [74507116] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:46,800 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [418500466] [2021-05-02 12:47:46,800 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 [2021-05-02 12:47:46,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:46,872 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 12:47:46,874 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:47:46,888 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:46,890 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:46,894 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:46,895 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:46,899 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:46,900 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:46,904 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:46,905 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:46,918 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:46,920 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:46,924 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:46,925 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:46,929 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:46,930 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:46,934 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:46,935 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:46,939 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:46,940 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:46,944 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:46,945 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:46,949 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:46,950 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:46,954 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:46,955 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:46,960 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:46,961 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:46,965 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:46,966 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:46,970 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:46,971 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:46,976 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:46,977 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:46,986 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:46,987 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:47,043 INFO L134 CoverageAnalysis]: Checked inductivity of 1758 backedges. 903 proven. 425 refuted. 0 times theorem prover too weak. 430 trivial. 0 not checked. [2021-05-02 12:47:47,043 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [418500466] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:47,043 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:47:47,043 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2021-05-02 12:47:47,043 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [115954569] [2021-05-02 12:47:47,044 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 12:47:47,044 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:47:47,044 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 12:47:47,044 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2021-05-02 12:47:47,045 INFO L87 Difference]: Start difference. First operand 1041 states and 1247 transitions. Second operand has 22 states, 22 states have (on average 3.5454545454545454) internal successors, (78), 21 states have internal predecessors, (78), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 12:47:47,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:47:47,358 INFO L93 Difference]: Finished difference Result 2653 states and 3089 transitions. [2021-05-02 12:47:47,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-02 12:47:47,359 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 3.5454545454545454) internal successors, (78), 21 states have internal predecessors, (78), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 125 [2021-05-02 12:47:47,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:47:47,363 INFO L225 Difference]: With dead ends: 2653 [2021-05-02 12:47:47,364 INFO L226 Difference]: Without dead ends: 1772 [2021-05-02 12:47:47,365 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 128 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 159.0ms TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2021-05-02 12:47:47,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1772 states. [2021-05-02 12:47:47,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1772 to 1107. [2021-05-02 12:47:47,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1107 states, 1073 states have (on average 1.1985088536812676) internal successors, (1286), 1081 states have internal predecessors, (1286), 19 states have call successors, (19), 15 states have call predecessors, (19), 14 states have return successors, (18), 10 states have call predecessors, (18), 18 states have call successors, (18) [2021-05-02 12:47:47,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1107 states to 1107 states and 1323 transitions. [2021-05-02 12:47:47,432 INFO L78 Accepts]: Start accepts. Automaton has 1107 states and 1323 transitions. Word has length 125 [2021-05-02 12:47:47,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:47:47,432 INFO L480 AbstractCegarLoop]: Abstraction has 1107 states and 1323 transitions. [2021-05-02 12:47:47,432 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 3.5454545454545454) internal successors, (78), 21 states have internal predecessors, (78), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 12:47:47,432 INFO L276 IsEmpty]: Start isEmpty. Operand 1107 states and 1323 transitions. [2021-05-02 12:47:47,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-05-02 12:47:47,434 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:47:47,434 INFO L523 BasicCegarLoop]: trace histogram [36, 36, 34, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:47:47,648 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:47:47,649 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:47:47,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:47:47,649 INFO L82 PathProgramCache]: Analyzing trace with hash 1338568318, now seen corresponding path program 8 times [2021-05-02 12:47:47,650 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:47:47,650 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1394569803] [2021-05-02 12:47:47,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:47:47,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:47,845 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:47:47,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:47,855 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2021-05-02 12:47:47,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:47,858 INFO L134 CoverageAnalysis]: Checked inductivity of 1969 backedges. 1012 proven. 477 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2021-05-02 12:47:47,858 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:47:47,858 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1394569803] [2021-05-02 12:47:47,859 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1394569803] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:47,859 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1099962401] [2021-05-02 12:47:47,859 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 [2021-05-02 12:47:47,914 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:47:47,914 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:47:47,916 INFO L263 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 12:47:47,917 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:47:47,931 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:47,932 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:47,937 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:47,938 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:47,942 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:47,943 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:47,947 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:47,948 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:47,952 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:47,953 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:47,957 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:47,958 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:47,963 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:47,964 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:47,968 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:47,969 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:47,973 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:47,974 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:47,978 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:47,979 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:47,982 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:47,983 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:47,987 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:47,988 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:47,992 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:47,993 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:47,997 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:47,998 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:48,004 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:48,007 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:48,011 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:48,012 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:48,016 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:48,017 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:48,022 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:48,023 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:48,078 INFO L134 CoverageAnalysis]: Checked inductivity of 1969 backedges. 1010 proven. 477 refuted. 0 times theorem prover too weak. 482 trivial. 0 not checked. [2021-05-02 12:47:48,079 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1099962401] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:48,079 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:47:48,079 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2021-05-02 12:47:48,079 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [439094366] [2021-05-02 12:47:48,079 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 12:47:48,079 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:47:48,080 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 12:47:48,080 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2021-05-02 12:47:48,080 INFO L87 Difference]: Start difference. First operand 1107 states and 1323 transitions. Second operand has 23 states, 23 states have (on average 3.5217391304347827) internal successors, (81), 22 states have internal predecessors, (81), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 12:47:48,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:47:48,451 INFO L93 Difference]: Finished difference Result 2773 states and 3228 transitions. [2021-05-02 12:47:48,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 12:47:48,452 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 3.5217391304347827) internal successors, (81), 22 states have internal predecessors, (81), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 131 [2021-05-02 12:47:48,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:47:48,457 INFO L225 Difference]: With dead ends: 2773 [2021-05-02 12:47:48,457 INFO L226 Difference]: Without dead ends: 1838 [2021-05-02 12:47:48,459 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 134 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 162.0ms TimeCoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2021-05-02 12:47:48,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1838 states. [2021-05-02 12:47:48,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1838 to 1173. [2021-05-02 12:47:48,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1173 states, 1139 states have (on average 1.195785776997366) internal successors, (1362), 1147 states have internal predecessors, (1362), 19 states have call successors, (19), 15 states have call predecessors, (19), 14 states have return successors, (18), 10 states have call predecessors, (18), 18 states have call successors, (18) [2021-05-02 12:47:48,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1173 states to 1173 states and 1399 transitions. [2021-05-02 12:47:48,567 INFO L78 Accepts]: Start accepts. Automaton has 1173 states and 1399 transitions. Word has length 131 [2021-05-02 12:47:48,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:47:48,567 INFO L480 AbstractCegarLoop]: Abstraction has 1173 states and 1399 transitions. [2021-05-02 12:47:48,568 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 3.5217391304347827) internal successors, (81), 22 states have internal predecessors, (81), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 12:47:48,568 INFO L276 IsEmpty]: Start isEmpty. Operand 1173 states and 1399 transitions. [2021-05-02 12:47:48,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-05-02 12:47:48,570 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:47:48,570 INFO L523 BasicCegarLoop]: trace histogram [38, 38, 36, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:47:48,783 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-05-02 12:47:48,783 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:47:48,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:47:48,784 INFO L82 PathProgramCache]: Analyzing trace with hash 255579498, now seen corresponding path program 9 times [2021-05-02 12:47:48,784 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:47:48,784 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [701603974] [2021-05-02 12:47:48,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:47:48,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:48,995 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:47:49,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:49,013 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 67 [2021-05-02 12:47:49,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:49,015 INFO L134 CoverageAnalysis]: Checked inductivity of 2192 backedges. 1125 proven. 532 refuted. 0 times theorem prover too weak. 535 trivial. 0 not checked. [2021-05-02 12:47:49,015 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:47:49,016 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [701603974] [2021-05-02 12:47:49,016 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [701603974] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:49,016 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1856265073] [2021-05-02 12:47:49,016 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 [2021-05-02 12:47:49,058 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 12:47:49,058 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:47:49,059 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 12:47:49,060 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:47:49,270 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:49,272 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:49,326 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:49,327 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:49,330 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:49,359 INFO L134 CoverageAnalysis]: Checked inductivity of 2192 backedges. 57 proven. 1126 refuted. 0 times theorem prover too weak. 1009 trivial. 0 not checked. [2021-05-02 12:47:49,359 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1856265073] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:49,359 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:47:49,359 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 10] total 31 [2021-05-02 12:47:49,360 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1441710212] [2021-05-02 12:47:49,360 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-02 12:47:49,361 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:47:49,361 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-02 12:47:49,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=254, Invalid=676, Unknown=0, NotChecked=0, Total=930 [2021-05-02 12:47:49,362 INFO L87 Difference]: Start difference. First operand 1173 states and 1399 transitions. Second operand has 31 states, 31 states have (on average 3.225806451612903) internal successors, (100), 29 states have internal predecessors, (100), 4 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 12:47:50,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:47:50,699 INFO L93 Difference]: Finished difference Result 3123 states and 3637 transitions. [2021-05-02 12:47:50,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-05-02 12:47:50,700 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 3.225806451612903) internal successors, (100), 29 states have internal predecessors, (100), 4 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 137 [2021-05-02 12:47:50,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:47:50,704 INFO L225 Difference]: With dead ends: 3123 [2021-05-02 12:47:50,704 INFO L226 Difference]: Without dead ends: 2134 [2021-05-02 12:47:50,707 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 134 SyntacticMatches, 0 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1110 ImplicationChecksByTransitivity, 992.8ms TimeCoverageRelationStatistics Valid=1224, Invalid=4032, Unknown=0, NotChecked=0, Total=5256 [2021-05-02 12:47:50,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2134 states. [2021-05-02 12:47:50,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2134 to 1462. [2021-05-02 12:47:50,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1462 states, 1421 states have (on average 1.1822660098522169) internal successors, (1680), 1432 states have internal predecessors, (1680), 23 states have call successors, (23), 18 states have call predecessors, (23), 17 states have return successors, (22), 11 states have call predecessors, (22), 22 states have call successors, (22) [2021-05-02 12:47:50,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1462 states to 1462 states and 1725 transitions. [2021-05-02 12:47:50,828 INFO L78 Accepts]: Start accepts. Automaton has 1462 states and 1725 transitions. Word has length 137 [2021-05-02 12:47:50,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:47:50,828 INFO L480 AbstractCegarLoop]: Abstraction has 1462 states and 1725 transitions. [2021-05-02 12:47:50,829 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 3.225806451612903) internal successors, (100), 29 states have internal predecessors, (100), 4 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 12:47:50,829 INFO L276 IsEmpty]: Start isEmpty. Operand 1462 states and 1725 transitions. [2021-05-02 12:47:50,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-05-02 12:47:50,830 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:47:50,830 INFO L523 BasicCegarLoop]: trace histogram [40, 40, 38, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:47:51,036 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-02 12:47:51,037 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:47:51,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:47:51,037 INFO L82 PathProgramCache]: Analyzing trace with hash 1995518210, now seen corresponding path program 10 times [2021-05-02 12:47:51,037 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:47:51,037 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1889224716] [2021-05-02 12:47:51,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:47:51,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:51,258 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:47:51,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:51,265 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 70 [2021-05-02 12:47:51,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:51,268 INFO L134 CoverageAnalysis]: Checked inductivity of 2427 backedges. 1244 proven. 590 refuted. 0 times theorem prover too weak. 593 trivial. 0 not checked. [2021-05-02 12:47:51,268 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:47:51,268 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1889224716] [2021-05-02 12:47:51,268 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1889224716] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:51,268 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [940636070] [2021-05-02 12:47:51,268 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 [2021-05-02 12:47:51,313 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:47:51,313 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:47:51,314 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 12:47:51,316 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:47:51,472 INFO L134 CoverageAnalysis]: Checked inductivity of 2427 backedges. 1282 proven. 0 refuted. 0 times theorem prover too weak. 1145 trivial. 0 not checked. [2021-05-02 12:47:51,472 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [940636070] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 12:47:51,472 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 12:47:51,472 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [24] total 26 [2021-05-02 12:47:51,473 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [604429428] [2021-05-02 12:47:51,473 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 12:47:51,473 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:47:51,473 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 12:47:51,473 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=391, Unknown=0, NotChecked=0, Total=650 [2021-05-02 12:47:51,473 INFO L87 Difference]: Start difference. First operand 1462 states and 1725 transitions. Second operand has 4 states, 4 states have (on average 6.0) internal successors, (24), 4 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 12:47:51,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:47:51,611 INFO L93 Difference]: Finished difference Result 2614 states and 2994 transitions. [2021-05-02 12:47:51,611 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 12:47:51,611 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.0) internal successors, (24), 4 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 143 [2021-05-02 12:47:51,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:47:51,626 INFO L225 Difference]: With dead ends: 2614 [2021-05-02 12:47:51,626 INFO L226 Difference]: Without dead ends: 1710 [2021-05-02 12:47:51,628 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 214.0ms TimeCoverageRelationStatistics Valid=259, Invalid=391, Unknown=0, NotChecked=0, Total=650 [2021-05-02 12:47:51,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1710 states. [2021-05-02 12:47:51,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1710 to 1224. [2021-05-02 12:47:51,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1224 states, 1195 states have (on average 1.1715481171548117) internal successors, (1400), 1200 states have internal predecessors, (1400), 15 states have call successors, (15), 14 states have call predecessors, (15), 13 states have return successors, (14), 9 states have call predecessors, (14), 14 states have call successors, (14) [2021-05-02 12:47:51,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1224 states to 1224 states and 1429 transitions. [2021-05-02 12:47:51,727 INFO L78 Accepts]: Start accepts. Automaton has 1224 states and 1429 transitions. Word has length 143 [2021-05-02 12:47:51,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:47:51,727 INFO L480 AbstractCegarLoop]: Abstraction has 1224 states and 1429 transitions. [2021-05-02 12:47:51,727 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 6.0) internal successors, (24), 4 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 12:47:51,727 INFO L276 IsEmpty]: Start isEmpty. Operand 1224 states and 1429 transitions. [2021-05-02 12:47:51,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-05-02 12:47:51,729 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:47:51,729 INFO L523 BasicCegarLoop]: trace histogram [41, 41, 39, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:47:51,944 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-05-02 12:47:51,945 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:47:51,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:47:51,945 INFO L82 PathProgramCache]: Analyzing trace with hash 375220455, now seen corresponding path program 1 times [2021-05-02 12:47:51,945 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:47:51,945 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1524829618] [2021-05-02 12:47:51,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:47:51,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:52,198 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:47:52,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:52,205 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 70 [2021-05-02 12:47:52,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:52,208 INFO L134 CoverageAnalysis]: Checked inductivity of 2549 backedges. 1305 proven. 590 refuted. 0 times theorem prover too weak. 654 trivial. 0 not checked. [2021-05-02 12:47:52,208 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:47:52,208 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1524829618] [2021-05-02 12:47:52,208 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1524829618] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:52,208 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1251586298] [2021-05-02 12:47:52,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:47:52,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:52,271 INFO L263 TraceCheckSpWp]: Trace formula consists of 309 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 12:47:52,273 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:47:52,289 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:52,290 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:52,297 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:52,301 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:52,313 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:52,315 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:52,318 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:52,319 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:52,323 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:52,327 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:52,331 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:52,332 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:52,335 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:52,336 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:52,340 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:52,341 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:52,345 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:52,346 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:52,349 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:52,350 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:52,354 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:52,355 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:52,358 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:52,359 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:52,363 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:52,364 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:52,369 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:52,370 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:52,374 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:52,375 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:52,379 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:52,380 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:52,384 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:52,385 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:52,389 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:52,390 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:52,394 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:52,395 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:52,399 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:52,400 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:52,460 INFO L134 CoverageAnalysis]: Checked inductivity of 2549 backedges. 1303 proven. 590 refuted. 0 times theorem prover too weak. 656 trivial. 0 not checked. [2021-05-02 12:47:52,460 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1251586298] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:52,461 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:47:52,461 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2021-05-02 12:47:52,461 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [243288276] [2021-05-02 12:47:52,461 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 12:47:52,461 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:47:52,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 12:47:52,462 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2021-05-02 12:47:52,462 INFO L87 Difference]: Start difference. First operand 1224 states and 1429 transitions. Second operand has 25 states, 25 states have (on average 3.44) internal successors, (86), 24 states have internal predecessors, (86), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 12:47:52,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:47:52,905 INFO L93 Difference]: Finished difference Result 2991 states and 3413 transitions. [2021-05-02 12:47:52,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 12:47:52,906 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 3.44) internal successors, (86), 24 states have internal predecessors, (86), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 146 [2021-05-02 12:47:52,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:47:52,911 INFO L225 Difference]: With dead ends: 2991 [2021-05-02 12:47:52,911 INFO L226 Difference]: Without dead ends: 1946 [2021-05-02 12:47:52,913 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 149 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 219.8ms TimeCoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2021-05-02 12:47:52,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1946 states. [2021-05-02 12:47:53,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1946 to 1275. [2021-05-02 12:47:53,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1275 states, 1246 states have (on average 1.1709470304975922) internal successors, (1459), 1251 states have internal predecessors, (1459), 15 states have call successors, (15), 14 states have call predecessors, (15), 13 states have return successors, (14), 9 states have call predecessors, (14), 14 states have call successors, (14) [2021-05-02 12:47:53,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1275 states to 1275 states and 1488 transitions. [2021-05-02 12:47:53,036 INFO L78 Accepts]: Start accepts. Automaton has 1275 states and 1488 transitions. Word has length 146 [2021-05-02 12:47:53,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:47:53,037 INFO L480 AbstractCegarLoop]: Abstraction has 1275 states and 1488 transitions. [2021-05-02 12:47:53,037 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 3.44) internal successors, (86), 24 states have internal predecessors, (86), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 12:47:53,037 INFO L276 IsEmpty]: Start isEmpty. Operand 1275 states and 1488 transitions. [2021-05-02 12:47:53,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-05-02 12:47:53,038 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:47:53,038 INFO L523 BasicCegarLoop]: trace histogram [42, 42, 40, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:47:53,256 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,27 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:47:53,257 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:47:53,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:47:53,257 INFO L82 PathProgramCache]: Analyzing trace with hash -1824149208, now seen corresponding path program 2 times [2021-05-02 12:47:53,257 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:47:53,257 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1215885158] [2021-05-02 12:47:53,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:47:53,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:53,501 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:47:53,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:53,505 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 73 [2021-05-02 12:47:53,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:53,508 INFO L134 CoverageAnalysis]: Checked inductivity of 2674 backedges. 1369 proven. 651 refuted. 0 times theorem prover too weak. 654 trivial. 0 not checked. [2021-05-02 12:47:53,508 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:47:53,508 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1215885158] [2021-05-02 12:47:53,508 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1215885158] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:53,508 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1057185584] [2021-05-02 12:47:53,508 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:47:53,578 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:47:53,579 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:47:53,580 INFO L263 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 24 conjunts are in the unsatisfiable core [2021-05-02 12:47:53,582 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:47:53,596 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:53,597 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:53,601 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:53,602 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:53,605 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:53,606 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:53,610 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:53,611 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:53,615 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:53,615 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:53,619 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:53,620 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:53,624 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:53,625 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:53,628 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:53,629 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:53,633 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:53,634 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:53,640 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:53,641 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:53,645 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:53,646 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:53,650 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:53,651 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:53,654 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:53,655 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:53,659 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:53,660 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:53,664 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:53,665 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:53,669 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:53,669 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:53,674 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:53,675 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:53,678 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:53,679 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:53,683 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:53,684 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:53,687 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:53,688 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:53,691 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:53,791 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:53,797 INFO L134 CoverageAnalysis]: Checked inductivity of 2674 backedges. 6 proven. 1974 refuted. 0 times theorem prover too weak. 694 trivial. 0 not checked. [2021-05-02 12:47:53,797 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1057185584] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:53,797 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:47:53,797 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 28 [2021-05-02 12:47:53,798 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [369562601] [2021-05-02 12:47:53,798 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 12:47:53,798 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:47:53,798 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 12:47:53,798 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=307, Invalid=449, Unknown=0, NotChecked=0, Total=756 [2021-05-02 12:47:53,799 INFO L87 Difference]: Start difference. First operand 1275 states and 1488 transitions. Second operand has 28 states, 28 states have (on average 3.607142857142857) internal successors, (101), 27 states have internal predecessors, (101), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 12:47:54,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:47:54,632 INFO L93 Difference]: Finished difference Result 3352 states and 3876 transitions. [2021-05-02 12:47:54,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-05-02 12:47:54,632 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 3.607142857142857) internal successors, (101), 27 states have internal predecessors, (101), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 149 [2021-05-02 12:47:54,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:47:54,638 INFO L225 Difference]: With dead ends: 3352 [2021-05-02 12:47:54,638 INFO L226 Difference]: Without dead ends: 2265 [2021-05-02 12:47:54,640 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 151 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 381 ImplicationChecksByTransitivity, 517.2ms TimeCoverageRelationStatistics Valid=862, Invalid=1688, Unknown=0, NotChecked=0, Total=2550 [2021-05-02 12:47:54,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2265 states. [2021-05-02 12:47:54,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2265 to 1315. [2021-05-02 12:47:54,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1315 states, 1286 states have (on average 1.1726283048211508) internal successors, (1508), 1291 states have internal predecessors, (1508), 15 states have call successors, (15), 14 states have call predecessors, (15), 13 states have return successors, (14), 9 states have call predecessors, (14), 14 states have call successors, (14) [2021-05-02 12:47:54,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1315 states to 1315 states and 1537 transitions. [2021-05-02 12:47:54,760 INFO L78 Accepts]: Start accepts. Automaton has 1315 states and 1537 transitions. Word has length 149 [2021-05-02 12:47:54,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:47:54,760 INFO L480 AbstractCegarLoop]: Abstraction has 1315 states and 1537 transitions. [2021-05-02 12:47:54,760 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 3.607142857142857) internal successors, (101), 27 states have internal predecessors, (101), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 12:47:54,760 INFO L276 IsEmpty]: Start isEmpty. Operand 1315 states and 1537 transitions. [2021-05-02 12:47:54,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2021-05-02 12:47:54,761 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:47:54,761 INFO L523 BasicCegarLoop]: trace histogram [44, 44, 42, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:47:54,977 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-05-02 12:47:54,977 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:47:54,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:47:54,977 INFO L82 PathProgramCache]: Analyzing trace with hash 1943283136, now seen corresponding path program 3 times [2021-05-02 12:47:54,977 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:47:54,978 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [589941126] [2021-05-02 12:47:54,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:47:54,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:55,213 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:47:55,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:55,216 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 76 [2021-05-02 12:47:55,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:55,219 INFO L134 CoverageAnalysis]: Checked inductivity of 2933 backedges. 1500 proven. 715 refuted. 0 times theorem prover too weak. 718 trivial. 0 not checked. [2021-05-02 12:47:55,219 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:47:55,219 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [589941126] [2021-05-02 12:47:55,220 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [589941126] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:55,220 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1819118165] [2021-05-02 12:47:55,220 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:47:55,274 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 12:47:55,274 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:47:55,275 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 12:47:55,277 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:47:55,599 INFO L134 CoverageAnalysis]: Checked inductivity of 2933 backedges. 1 proven. 1502 refuted. 0 times theorem prover too weak. 1430 trivial. 0 not checked. [2021-05-02 12:47:55,599 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1819118165] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:55,599 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:47:55,599 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 10] total 34 [2021-05-02 12:47:55,600 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [625493266] [2021-05-02 12:47:55,600 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-02 12:47:55,600 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:47:55,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-02 12:47:55,601 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=319, Invalid=803, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 12:47:55,601 INFO L87 Difference]: Start difference. First operand 1315 states and 1537 transitions. Second operand has 34 states, 34 states have (on average 3.176470588235294) internal successors, (108), 32 states have internal predecessors, (108), 4 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 12:47:57,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:47:57,222 INFO L93 Difference]: Finished difference Result 3036 states and 3491 transitions. [2021-05-02 12:47:57,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2021-05-02 12:47:57,228 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 3.176470588235294) internal successors, (108), 32 states have internal predecessors, (108), 4 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 155 [2021-05-02 12:47:57,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:47:57,233 INFO L225 Difference]: With dead ends: 3036 [2021-05-02 12:47:57,233 INFO L226 Difference]: Without dead ends: 1918 [2021-05-02 12:47:57,238 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 236 GetRequests, 153 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1518 ImplicationChecksByTransitivity, 1242.0ms TimeCoverageRelationStatistics Valid=1544, Invalid=5596, Unknown=0, NotChecked=0, Total=7140 [2021-05-02 12:47:57,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1918 states. [2021-05-02 12:47:57,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1918 to 1254. [2021-05-02 12:47:57,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1254 states, 1225 states have (on average 1.1706122448979592) internal successors, (1434), 1230 states have internal predecessors, (1434), 15 states have call successors, (15), 14 states have call predecessors, (15), 13 states have return successors, (14), 9 states have call predecessors, (14), 14 states have call successors, (14) [2021-05-02 12:47:57,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1254 states to 1254 states and 1463 transitions. [2021-05-02 12:47:57,343 INFO L78 Accepts]: Start accepts. Automaton has 1254 states and 1463 transitions. Word has length 155 [2021-05-02 12:47:57,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:47:57,343 INFO L480 AbstractCegarLoop]: Abstraction has 1254 states and 1463 transitions. [2021-05-02 12:47:57,343 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 3.176470588235294) internal successors, (108), 32 states have internal predecessors, (108), 4 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 12:47:57,343 INFO L276 IsEmpty]: Start isEmpty. Operand 1254 states and 1463 transitions. [2021-05-02 12:47:57,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 240 [2021-05-02 12:47:57,346 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:47:57,347 INFO L523 BasicCegarLoop]: trace histogram [69, 69, 66, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:47:57,562 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:47:57,563 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:47:57,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:47:57,563 INFO L82 PathProgramCache]: Analyzing trace with hash -794549114, now seen corresponding path program 4 times [2021-05-02 12:47:57,563 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:47:57,563 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [762591211] [2021-05-02 12:47:57,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:47:57,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:57,871 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:47:57,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:57,883 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 79 [2021-05-02 12:47:57,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:57,885 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 157 [2021-05-02 12:47:57,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:57,888 INFO L134 CoverageAnalysis]: Checked inductivity of 7268 backedges. 3274 proven. 782 refuted. 0 times theorem prover too weak. 3212 trivial. 0 not checked. [2021-05-02 12:47:57,888 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:47:57,888 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [762591211] [2021-05-02 12:47:57,888 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [762591211] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:57,888 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [762162987] [2021-05-02 12:47:57,888 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:47:57,968 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:47:57,968 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:47:57,970 INFO L263 TraceCheckSpWp]: Trace formula consists of 438 conjuncts, 25 conjunts are in the unsatisfiable core [2021-05-02 12:47:57,972 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:47:57,986 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:57,987 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:57,991 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:57,992 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:57,998 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:57,999 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:58,003 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:58,004 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:58,018 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:58,019 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:58,022 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:58,023 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:58,028 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:58,029 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:58,032 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:58,033 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:58,037 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:58,038 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:58,041 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:58,042 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:58,047 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:58,048 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:58,053 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:58,054 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:58,058 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:58,058 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:58,063 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:58,064 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:58,068 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:58,068 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:58,072 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:58,073 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:58,079 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:58,080 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:58,085 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:58,085 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:58,089 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:58,090 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:58,093 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:58,094 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:58,097 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:58,098 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:58,102 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:58,103 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:58,106 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:58,107 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:58,229 INFO L134 CoverageAnalysis]: Checked inductivity of 7268 backedges. 3270 proven. 782 refuted. 0 times theorem prover too weak. 3216 trivial. 0 not checked. [2021-05-02 12:47:58,229 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [762162987] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:58,229 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:47:58,229 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 28 [2021-05-02 12:47:58,229 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1126335521] [2021-05-02 12:47:58,230 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 12:47:58,230 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:47:58,230 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 12:47:58,230 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2021-05-02 12:47:58,230 INFO L87 Difference]: Start difference. First operand 1254 states and 1463 transitions. Second operand has 28 states, 28 states have (on average 3.392857142857143) internal successors, (95), 27 states have internal predecessors, (95), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 12:47:58,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:47:58,717 INFO L93 Difference]: Finished difference Result 3022 states and 3450 transitions. [2021-05-02 12:47:58,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 12:47:58,718 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 3.392857142857143) internal successors, (95), 27 states have internal predecessors, (95), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 239 [2021-05-02 12:47:58,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:47:58,723 INFO L225 Difference]: With dead ends: 3022 [2021-05-02 12:47:58,723 INFO L226 Difference]: Without dead ends: 1974 [2021-05-02 12:47:58,724 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 270 GetRequests, 244 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 268.2ms TimeCoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2021-05-02 12:47:58,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1974 states. [2021-05-02 12:47:58,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1974 to 1307. [2021-05-02 12:47:58,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1307 states, 1278 states have (on average 1.1697965571205007) internal successors, (1495), 1283 states have internal predecessors, (1495), 15 states have call successors, (15), 14 states have call predecessors, (15), 13 states have return successors, (14), 9 states have call predecessors, (14), 14 states have call successors, (14) [2021-05-02 12:47:58,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1307 states to 1307 states and 1524 transitions. [2021-05-02 12:47:58,828 INFO L78 Accepts]: Start accepts. Automaton has 1307 states and 1524 transitions. Word has length 239 [2021-05-02 12:47:58,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:47:58,829 INFO L480 AbstractCegarLoop]: Abstraction has 1307 states and 1524 transitions. [2021-05-02 12:47:58,829 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 3.392857142857143) internal successors, (95), 27 states have internal predecessors, (95), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 12:47:58,829 INFO L276 IsEmpty]: Start isEmpty. Operand 1307 states and 1524 transitions. [2021-05-02 12:47:58,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 249 [2021-05-02 12:47:58,832 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:47:58,832 INFO L523 BasicCegarLoop]: trace histogram [72, 72, 69, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:47:59,045 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-05-02 12:47:59,045 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:47:59,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:47:59,045 INFO L82 PathProgramCache]: Analyzing trace with hash 1787270213, now seen corresponding path program 5 times [2021-05-02 12:47:59,045 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:47:59,046 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1185969572] [2021-05-02 12:47:59,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:47:59,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:59,357 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:47:59,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:59,361 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 82 [2021-05-02 12:47:59,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:59,363 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 163 [2021-05-02 12:47:59,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:47:59,366 INFO L134 CoverageAnalysis]: Checked inductivity of 7907 backedges. 3560 proven. 852 refuted. 0 times theorem prover too weak. 3495 trivial. 0 not checked. [2021-05-02 12:47:59,366 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:47:59,366 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1185969572] [2021-05-02 12:47:59,366 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1185969572] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:47:59,366 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2080228171] [2021-05-02 12:47:59,366 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:47:59,451 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 47 check-sat command(s) [2021-05-02 12:47:59,451 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:47:59,452 INFO L263 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 12:47:59,455 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:47:59,478 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:59,479 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:59,496 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:59,497 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:59,516 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:59,517 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:59,538 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:59,539 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:59,558 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:59,559 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:59,580 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:59,581 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:59,602 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:59,603 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:59,624 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:59,625 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:59,647 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:59,648 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:59,671 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:59,672 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:59,695 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:59,696 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:59,720 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:59,721 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:59,745 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:59,746 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:59,771 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:59,772 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:59,798 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:59,799 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:59,826 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:59,827 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:59,866 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:59,867 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:59,896 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:59,897 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:59,937 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:59,938 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:59,967 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:47:59,978 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:48:00,009 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:48:00,010 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:48:00,040 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:48:00,041 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:48:00,070 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:48:00,072 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:48:00,104 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:48:00,105 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:48:00,136 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:48:00,176 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:48:00,297 INFO L134 CoverageAnalysis]: Checked inductivity of 7907 backedges. 3712 proven. 805 refuted. 0 times theorem prover too weak. 3390 trivial. 0 not checked. [2021-05-02 12:48:00,297 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2080228171] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:48:00,297 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:48:00,297 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 29] total 55 [2021-05-02 12:48:00,297 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [353361860] [2021-05-02 12:48:00,298 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2021-05-02 12:48:00,298 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:48:00,298 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-05-02 12:48:00,299 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=757, Invalid=2213, Unknown=0, NotChecked=0, Total=2970 [2021-05-02 12:48:00,299 INFO L87 Difference]: Start difference. First operand 1307 states and 1524 transitions. Second operand has 55 states, 55 states have (on average 3.2) internal successors, (176), 54 states have internal predecessors, (176), 3 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 12:48:13,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:48:13,292 INFO L93 Difference]: Finished difference Result 8421 states and 9789 transitions. [2021-05-02 12:48:13,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 429 states. [2021-05-02 12:48:13,297 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 3.2) internal successors, (176), 54 states have internal predecessors, (176), 3 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 248 [2021-05-02 12:48:13,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:48:13,315 INFO L225 Difference]: With dead ends: 8421 [2021-05-02 12:48:13,316 INFO L226 Difference]: Without dead ends: 7329 [2021-05-02 12:48:13,330 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 1006 GetRequests, 577 SyntacticMatches, 0 SemanticMatches, 429 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97417 ImplicationChecksByTransitivity, 10381.9ms TimeCoverageRelationStatistics Valid=56110, Invalid=129220, Unknown=0, NotChecked=0, Total=185330 [2021-05-02 12:48:13,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7329 states. [2021-05-02 12:48:14,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7329 to 5087. [2021-05-02 12:48:14,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5087 states, 5052 states have (on average 1.051464766429137) internal successors, (5312), 5058 states have internal predecessors, (5312), 18 states have call successors, (18), 17 states have call predecessors, (18), 16 states have return successors, (17), 11 states have call predecessors, (17), 17 states have call successors, (17) [2021-05-02 12:48:14,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5087 states to 5087 states and 5347 transitions. [2021-05-02 12:48:14,177 INFO L78 Accepts]: Start accepts. Automaton has 5087 states and 5347 transitions. Word has length 248 [2021-05-02 12:48:14,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:48:14,177 INFO L480 AbstractCegarLoop]: Abstraction has 5087 states and 5347 transitions. [2021-05-02 12:48:14,177 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 55 states, 55 states have (on average 3.2) internal successors, (176), 54 states have internal predecessors, (176), 3 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 12:48:14,177 INFO L276 IsEmpty]: Start isEmpty. Operand 5087 states and 5347 transitions. [2021-05-02 12:48:14,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 258 [2021-05-02 12:48:14,186 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:48:14,186 INFO L523 BasicCegarLoop]: trace histogram [75, 75, 72, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:48:14,402 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:48:14,403 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:48:14,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:48:14,403 INFO L82 PathProgramCache]: Analyzing trace with hash 1062652774, now seen corresponding path program 6 times [2021-05-02 12:48:14,403 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:48:14,403 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1367749295] [2021-05-02 12:48:14,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:48:14,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:48:14,739 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:48:14,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:48:14,749 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 85 [2021-05-02 12:48:14,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:48:14,751 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 169 [2021-05-02 12:48:14,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:48:14,753 INFO L134 CoverageAnalysis]: Checked inductivity of 8573 backedges. 3858 proven. 925 refuted. 0 times theorem prover too weak. 3790 trivial. 0 not checked. [2021-05-02 12:48:14,753 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:48:14,753 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1367749295] [2021-05-02 12:48:14,754 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1367749295] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:48:14,754 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [984921038] [2021-05-02 12:48:14,754 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:48:14,802 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-05-02 12:48:14,802 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:48:14,803 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 12:48:14,806 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:48:15,016 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:48:15,132 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:48:15,133 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:48:15,176 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:48:15,178 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:48:15,180 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:48:15,217 INFO L134 CoverageAnalysis]: Checked inductivity of 8573 backedges. 3939 proven. 1 refuted. 0 times theorem prover too weak. 4633 trivial. 0 not checked. [2021-05-02 12:48:15,217 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [984921038] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:48:15,217 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:48:15,218 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 10] total 37 [2021-05-02 12:48:15,218 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [744427916] [2021-05-02 12:48:15,218 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-02 12:48:15,218 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:48:15,218 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-02 12:48:15,219 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=402, Invalid=930, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 12:48:15,219 INFO L87 Difference]: Start difference. First operand 5087 states and 5347 transitions. Second operand has 37 states, 37 states have (on average 3.2162162162162162) internal successors, (119), 35 states have internal predecessors, (119), 3 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 12:48:16,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:48:16,983 INFO L93 Difference]: Finished difference Result 10096 states and 10791 transitions. [2021-05-02 12:48:16,983 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-02 12:48:16,984 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 3.2162162162162162) internal successors, (119), 35 states have internal predecessors, (119), 3 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 257 [2021-05-02 12:48:16,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:48:16,984 INFO L225 Difference]: With dead ends: 10096 [2021-05-02 12:48:16,984 INFO L226 Difference]: Without dead ends: 0 [2021-05-02 12:48:16,996 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 255 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 644 ImplicationChecksByTransitivity, 937.7ms TimeCoverageRelationStatistics Valid=1221, Invalid=2939, Unknown=0, NotChecked=0, Total=4160 [2021-05-02 12:48:16,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-05-02 12:48:16,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-05-02 12:48:16,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-02 12:48:16,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-05-02 12:48:16,997 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 257 [2021-05-02 12:48:16,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:48:16,997 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-05-02 12:48:16,997 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 3.2162162162162162) internal successors, (119), 35 states have internal predecessors, (119), 3 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 12:48:16,997 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-05-02 12:48:16,997 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-05-02 12:48:17,216 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-05-02 12:48:17,219 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2021-05-02 12:48:17,513 WARN L205 SmtUtils]: Spent 284.00 ms on a formula simplification. DAG size of input: 385 DAG size of output: 241 [2021-05-02 12:59:32,210 WARN L205 SmtUtils]: Spent 11.24 m on a formula simplification. DAG size of input: 5582 DAG size of output: 3935 [2021-05-02 12:59:32,365 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 252 DAG size of output: 23 [2021-05-02 12:59:32,512 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 113 DAG size of output: 1 [2021-05-02 12:59:32,702 WARN L205 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 192 DAG size of output: 30