/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-acceleration/array_2-2.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 12:04:27,209 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 12:04:27,211 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 12:04:27,235 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 12:04:27,260 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 12:04:27,262 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 12:04:27,264 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 12:04:27,265 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 12:04:27,266 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 12:04:27,267 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 12:04:27,272 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 12:04:27,289 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 12:04:27,291 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 12:04:27,294 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 12:04:27,295 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 12:04:27,296 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 12:04:27,298 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 12:04:27,303 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 12:04:27,304 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 12:04:27,304 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 12:04:27,308 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 12:04:27,335 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 12:04:27,336 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 12:04:27,337 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 12:04:27,337 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 12:04:27,337 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 12:04:27,337 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 12:04:27,338 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 12:04:27,338 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 12:04:27,338 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 12:04:27,338 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 12:04:27,338 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 12:04:27,338 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 12:04:27,338 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 12:04:27,338 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 12:04:27,338 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 12:04:27,339 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 12:04:27,339 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 12:04:27,339 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 12:04:27,339 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 12:04:27,339 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 12:04:27,339 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 12:04:27,339 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 12:04:27,339 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 12:04:27,339 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 12:04:27,340 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 12:04:27,340 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 12:04:27,340 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 12:04:27,340 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 12:04:27,340 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 12:04:27,606 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 12:04:27,629 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 12:04:27,631 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 12:04:27,632 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 12:04:27,633 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 12:04:27,634 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_2-2.i [2021-05-02 12:04:27,691 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/978d5b76a/8358842054574f5383814956da66f18b/FLAGf365e8602 [2021-05-02 12:04:28,070 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 12:04:28,072 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_2-2.i [2021-05-02 12:04:28,077 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/978d5b76a/8358842054574f5383814956da66f18b/FLAGf365e8602 [2021-05-02 12:04:28,477 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/978d5b76a/8358842054574f5383814956da66f18b [2021-05-02 12:04:28,478 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 12:04:28,479 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 12:04:28,480 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 12:04:28,481 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 12:04:28,483 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 12:04:28,484 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 12:04:28" (1/1) ... [2021-05-02 12:04:28,485 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@11c16405 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:04:28, skipping insertion in model container [2021-05-02 12:04:28,485 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 12:04:28" (1/1) ... [2021-05-02 12:04:28,489 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 12:04:28,499 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 12:04:28,573 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-acceleration/array_2-2.i[849,862] [2021-05-02 12:04:28,593 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 12:04:28,598 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 12:04:28,637 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-acceleration/array_2-2.i[849,862] [2021-05-02 12:04:28,646 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 12:04:28,656 INFO L208 MainTranslator]: Completed translation [2021-05-02 12:04:28,656 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:04:28 WrapperNode [2021-05-02 12:04:28,656 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 12:04:28,657 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 12:04:28,657 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 12:04:28,657 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 12:04:28,664 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:04:28" (1/1) ... [2021-05-02 12:04:28,664 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:04:28" (1/1) ... [2021-05-02 12:04:28,668 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:04:28" (1/1) ... [2021-05-02 12:04:28,668 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:04:28" (1/1) ... [2021-05-02 12:04:28,672 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:04:28" (1/1) ... [2021-05-02 12:04:28,674 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:04:28" (1/1) ... [2021-05-02 12:04:28,675 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:04:28" (1/1) ... [2021-05-02 12:04:28,676 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 12:04:28,677 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 12:04:28,677 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 12:04:28,677 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 12:04:28,678 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:04:28" (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 12:04:28,726 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 12:04:28,727 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 12:04:28,727 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 12:04:28,727 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 12:04:28,727 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 12:04:28,727 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 12:04:28,727 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 12:04:28,727 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-02 12:04:28,727 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-02 12:04:28,727 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 12:04:28,727 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 12:04:28,727 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-02 12:04:28,727 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 12:04:28,728 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 12:04:28,728 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 12:04:28,728 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 12:04:28,728 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 12:04:28,728 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 12:04:28,728 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 12:04:28,728 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 12:04:28,933 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 12:04:28,933 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-02 12:04:28,934 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 12:04:28 BoogieIcfgContainer [2021-05-02 12:04:28,934 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 12:04:28,935 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 12:04:28,935 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 12:04:28,937 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 12:04:28,937 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 12:04:28" (1/3) ... [2021-05-02 12:04:28,937 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@710c20bf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 12:04:28, skipping insertion in model container [2021-05-02 12:04:28,938 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:04:28" (2/3) ... [2021-05-02 12:04:28,938 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@710c20bf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 12:04:28, skipping insertion in model container [2021-05-02 12:04:28,938 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 12:04:28" (3/3) ... [2021-05-02 12:04:28,939 INFO L111 eAbstractionObserver]: Analyzing ICFG array_2-2.i [2021-05-02 12:04:28,942 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 12:04:28,945 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 12:04:28,956 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 12:04:28,971 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 12:04:28,971 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 12:04:28,971 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 12:04:28,971 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 12:04:28,972 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 12:04:28,972 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 12:04:28,972 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 12:04:28,972 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 12:04:28,982 INFO L276 IsEmpty]: Start isEmpty. Operand has 24 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 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 12:04:28,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 12:04:28,985 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:28,986 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:28,986 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:28,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:28,989 INFO L82 PathProgramCache]: Analyzing trace with hash -1954431608, now seen corresponding path program 1 times [2021-05-02 12:04:28,994 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:28,995 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1176148460] [2021-05-02 12:04:28,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:29,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:29,130 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:29,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:29,146 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 12:04:29,146 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:29,146 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1176148460] [2021-05-02 12:04:29,147 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1176148460] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 12:04:29,147 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 12:04:29,147 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 12:04:29,148 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1896685711] [2021-05-02 12:04:29,150 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 12:04:29,150 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:29,161 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 12:04:29,162 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 12:04:29,163 INFO L87 Difference]: Start difference. First operand has 24 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 2 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 12:04:29,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:29,228 INFO L93 Difference]: Finished difference Result 40 states and 47 transitions. [2021-05-02 12:04:29,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 12:04:29,230 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 2 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 12:04:29,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:29,234 INFO L225 Difference]: With dead ends: 40 [2021-05-02 12:04:29,234 INFO L226 Difference]: Without dead ends: 17 [2021-05-02 12:04:29,238 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 29.5ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 12:04:29,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-02 12:04:29,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-05-02 12:04:29,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:04:29,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2021-05-02 12:04:29,260 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 14 [2021-05-02 12:04:29,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:29,260 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2021-05-02 12:04:29,260 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 2 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 12:04:29,260 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2021-05-02 12:04:29,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 12:04:29,261 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:29,261 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:29,261 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 12:04:29,261 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:29,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:29,262 INFO L82 PathProgramCache]: Analyzing trace with hash 301833364, now seen corresponding path program 1 times [2021-05-02 12:04:29,262 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:29,262 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [863383817] [2021-05-02 12:04:29,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:29,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:29,319 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:29,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:29,364 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 12:04:29,364 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:29,365 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [863383817] [2021-05-02 12:04:29,365 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [863383817] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 12:04:29,365 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 12:04:29,365 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 12:04:29,365 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1492134789] [2021-05-02 12:04:29,366 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 12:04:29,366 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:29,367 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 12:04:29,367 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 12:04:29,367 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:04:29,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:29,425 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2021-05-02 12:04:29,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 12:04:29,426 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 12:04:29,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:29,427 INFO L225 Difference]: With dead ends: 30 [2021-05-02 12:04:29,427 INFO L226 Difference]: Without dead ends: 21 [2021-05-02 12:04:29,428 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 20.7ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 12:04:29,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-05-02 12:04:29,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 19. [2021-05-02 12:04:29,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:04:29,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2021-05-02 12:04:29,443 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 14 [2021-05-02 12:04:29,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:29,443 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2021-05-02 12:04:29,443 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 12:04:29,443 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2021-05-02 12:04:29,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 12:04:29,445 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:29,445 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:29,445 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 12:04:29,445 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:29,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:29,446 INFO L82 PathProgramCache]: Analyzing trace with hash 1319589272, now seen corresponding path program 1 times [2021-05-02 12:04:29,446 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:29,446 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1593171202] [2021-05-02 12:04:29,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:29,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:29,509 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:29,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:29,533 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 12:04:29,534 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:29,534 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1593171202] [2021-05-02 12:04:29,534 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1593171202] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:29,534 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [769533611] [2021-05-02 12:04:29,534 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 12:04:29,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:29,621 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 3 conjunts are in the unsatisfiable core [2021-05-02 12:04:29,625 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:04:29,669 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:29,681 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:29,712 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 12:04:29,712 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [769533611] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:29,712 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:04:29,712 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-02 12:04:29,712 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1757262989] [2021-05-02 12:04:29,713 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 12:04:29,713 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:29,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 12:04:29,715 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 12:04:29,715 INFO L87 Difference]: Start difference. First operand 19 states and 20 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 12:04:29,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:29,764 INFO L93 Difference]: Finished difference Result 35 states and 38 transitions. [2021-05-02 12:04:29,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 12:04:29,765 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 18 [2021-05-02 12:04:29,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:29,765 INFO L225 Difference]: With dead ends: 35 [2021-05-02 12:04:29,765 INFO L226 Difference]: Without dead ends: 25 [2021-05-02 12:04:29,766 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 22.0ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 12:04:29,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-05-02 12:04:29,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 23. [2021-05-02 12:04:29,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 18 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:04:29,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2021-05-02 12:04:29,769 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 18 [2021-05-02 12:04:29,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:29,769 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2021-05-02 12:04:29,769 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 12:04:29,769 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2021-05-02 12:04:29,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 12:04:29,770 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:29,770 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:29,970 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 12:04:29,971 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:29,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:29,972 INFO L82 PathProgramCache]: Analyzing trace with hash 1327365276, now seen corresponding path program 2 times [2021-05-02 12:04:29,972 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:29,972 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [509407898] [2021-05-02 12:04:29,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:29,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:30,035 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:30,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:30,048 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 12:04:30,048 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:30,048 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [509407898] [2021-05-02 12:04:30,049 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [509407898] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:30,049 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [266282590] [2021-05-02 12:04:30,049 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:04:30,097 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:04:30,097 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:04:30,098 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 12:04:30,099 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:04:30,135 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:30,138 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:30,152 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:30,155 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:30,187 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 12:04:30,188 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [266282590] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:30,188 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:04:30,188 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 12:04:30,188 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [940056567] [2021-05-02 12:04:30,188 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 12:04:30,188 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:30,189 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 12:04:30,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 12:04:30,189 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:04:30,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:30,230 INFO L93 Difference]: Finished difference Result 41 states and 44 transitions. [2021-05-02 12:04:30,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 12:04:30,231 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2021-05-02 12:04:30,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:30,231 INFO L225 Difference]: With dead ends: 41 [2021-05-02 12:04:30,232 INFO L226 Difference]: Without dead ends: 29 [2021-05-02 12:04:30,232 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 27.7ms TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 12:04:30,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-02 12:04:30,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2021-05-02 12:04:30,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 22 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:04:30,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2021-05-02 12:04:30,235 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 22 [2021-05-02 12:04:30,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:30,235 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2021-05-02 12:04:30,236 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:04:30,236 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2021-05-02 12:04:30,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 12:04:30,236 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:30,236 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:30,452 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:04:30,453 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:30,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:30,453 INFO L82 PathProgramCache]: Analyzing trace with hash -2060021344, now seen corresponding path program 3 times [2021-05-02 12:04:30,454 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:30,454 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1197123890] [2021-05-02 12:04:30,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:30,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:30,501 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:30,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:30,505 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 12:04:30,505 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:30,505 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1197123890] [2021-05-02 12:04:30,506 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1197123890] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:30,506 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [212650915] [2021-05-02 12:04:30,506 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:04:30,555 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 12:04:30,556 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:04:30,557 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 12:04:30,560 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:04:30,596 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:30,597 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:30,602 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:30,603 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:30,608 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:30,609 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:30,616 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 12:04:30,616 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [212650915] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:30,616 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:04:30,617 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 12:04:30,617 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1129109450] [2021-05-02 12:04:30,617 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 12:04:30,617 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:30,617 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 12:04:30,618 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 12:04:30,618 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand has 8 states, 8 states have (on average 3.875) internal successors, (31), 7 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:04:30,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:30,681 INFO L93 Difference]: Finished difference Result 47 states and 50 transitions. [2021-05-02 12:04:30,681 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 12:04:30,682 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.875) internal successors, (31), 7 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2021-05-02 12:04:30,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:30,683 INFO L225 Difference]: With dead ends: 47 [2021-05-02 12:04:30,683 INFO L226 Difference]: Without dead ends: 33 [2021-05-02 12:04:30,684 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 26.3ms TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 12:04:30,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-02 12:04:30,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2021-05-02 12:04:30,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.0769230769230769) internal successors, (28), 26 states have internal predecessors, (28), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:04:30,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2021-05-02 12:04:30,691 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 26 [2021-05-02 12:04:30,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:30,691 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2021-05-02 12:04:30,691 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.875) internal successors, (31), 7 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:04:30,692 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2021-05-02 12:04:30,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-02 12:04:30,693 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:30,693 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:30,904 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:04:30,904 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:30,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:30,905 INFO L82 PathProgramCache]: Analyzing trace with hash -515500892, now seen corresponding path program 4 times [2021-05-02 12:04:30,905 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:30,905 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [249490614] [2021-05-02 12:04:30,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:30,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:30,978 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:30,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:30,983 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 12:04:30,985 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:30,985 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [249490614] [2021-05-02 12:04:30,985 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [249490614] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:30,985 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [230738443] [2021-05-02 12:04:30,985 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:04:31,040 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:04:31,041 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:04:31,041 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 12:04:31,044 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:04:31,066 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:31,068 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:31,075 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:31,077 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:31,082 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:31,084 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:31,088 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:31,092 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:31,114 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 12:04:31,114 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [230738443] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:31,114 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:04:31,114 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-02 12:04:31,114 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [807981627] [2021-05-02 12:04:31,115 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 12:04:31,115 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:31,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 12:04:31,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 12:04:31,117 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 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 12:04:31,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:31,176 INFO L93 Difference]: Finished difference Result 53 states and 56 transitions. [2021-05-02 12:04:31,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 12:04:31,176 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 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 30 [2021-05-02 12:04:31,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:31,177 INFO L225 Difference]: With dead ends: 53 [2021-05-02 12:04:31,177 INFO L226 Difference]: Without dead ends: 37 [2021-05-02 12:04:31,177 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 38.1ms TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 12:04:31,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-05-02 12:04:31,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2021-05-02 12:04:31,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 30 states have (on average 1.0666666666666667) internal successors, (32), 30 states have internal predecessors, (32), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:04:31,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2021-05-02 12:04:31,180 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 30 [2021-05-02 12:04:31,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:31,180 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2021-05-02 12:04:31,180 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 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 12:04:31,180 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2021-05-02 12:04:31,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-02 12:04:31,181 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:31,181 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:31,396 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:04:31,396 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:31,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:31,397 INFO L82 PathProgramCache]: Analyzing trace with hash 1377928616, now seen corresponding path program 5 times [2021-05-02 12:04:31,397 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:31,397 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [439768869] [2021-05-02 12:04:31,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:31,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:31,466 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:31,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:31,474 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-02 12:04:31,474 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:31,474 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [439768869] [2021-05-02 12:04:31,474 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [439768869] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:31,474 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [90682999] [2021-05-02 12:04:31,475 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:04:31,831 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-05-02 12:04:31,831 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:04:31,834 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 12:04:31,836 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:04:31,863 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:31,865 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:31,872 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:31,875 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:31,879 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:31,881 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:31,885 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:31,888 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:31,894 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:31,895 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:31,903 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-02 12:04:31,903 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [90682999] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:31,903 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:04:31,903 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-02 12:04:31,903 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [646377778] [2021-05-02 12:04:31,904 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 12:04:31,904 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:31,904 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 12:04:31,904 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-05-02 12:04:31,904 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand has 10 states, 10 states have (on average 3.9) internal successors, (39), 9 states have internal predecessors, (39), 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 12:04:31,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:31,965 INFO L93 Difference]: Finished difference Result 59 states and 62 transitions. [2021-05-02 12:04:31,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 12:04:31,965 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.9) internal successors, (39), 9 states have internal predecessors, (39), 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 34 [2021-05-02 12:04:31,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:31,966 INFO L225 Difference]: With dead ends: 59 [2021-05-02 12:04:31,966 INFO L226 Difference]: Without dead ends: 41 [2021-05-02 12:04:31,966 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 40.3ms TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-05-02 12:04:31,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-05-02 12:04:31,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 39. [2021-05-02 12:04:31,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 34 states have (on average 1.0588235294117647) internal successors, (36), 34 states have internal predecessors, (36), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:04:31,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2021-05-02 12:04:31,969 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 34 [2021-05-02 12:04:31,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:31,969 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2021-05-02 12:04:31,969 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.9) internal successors, (39), 9 states have internal predecessors, (39), 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 12:04:31,969 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2021-05-02 12:04:31,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 12:04:31,970 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:31,970 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:32,186 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-02 12:04:32,186 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:32,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:32,187 INFO L82 PathProgramCache]: Analyzing trace with hash 1159586988, now seen corresponding path program 6 times [2021-05-02 12:04:32,187 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:32,187 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1317306977] [2021-05-02 12:04:32,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:32,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:32,258 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:32,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:32,262 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 12:04:32,262 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:32,262 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1317306977] [2021-05-02 12:04:32,262 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1317306977] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:32,262 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1914984371] [2021-05-02 12:04:32,262 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:04:32,428 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-05-02 12:04:32,428 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:04:32,430 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-02 12:04:32,431 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:04:32,478 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:32,481 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:32,491 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:32,492 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:32,496 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:32,500 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:32,506 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:32,508 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:32,512 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:32,514 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:32,519 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:32,520 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:32,528 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 12:04:32,529 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1914984371] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:32,529 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:04:32,529 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2021-05-02 12:04:32,529 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [511492585] [2021-05-02 12:04:32,529 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 12:04:32,529 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:32,530 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 12:04:32,530 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2021-05-02 12:04:32,530 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand has 11 states, 11 states have (on average 3.909090909090909) internal successors, (43), 10 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:04:32,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:32,599 INFO L93 Difference]: Finished difference Result 65 states and 68 transitions. [2021-05-02 12:04:32,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 12:04:32,599 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.909090909090909) internal successors, (43), 10 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2021-05-02 12:04:32,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:32,600 INFO L225 Difference]: With dead ends: 65 [2021-05-02 12:04:32,600 INFO L226 Difference]: Without dead ends: 45 [2021-05-02 12:04:32,600 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 49.6ms TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2021-05-02 12:04:32,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-02 12:04:32,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 43. [2021-05-02 12:04:32,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 38 states have (on average 1.0526315789473684) internal successors, (40), 38 states have internal predecessors, (40), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:04:32,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2021-05-02 12:04:32,603 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 38 [2021-05-02 12:04:32,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:32,604 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2021-05-02 12:04:32,604 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.909090909090909) internal successors, (43), 10 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:04:32,604 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2021-05-02 12:04:32,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-02 12:04:32,604 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:32,604 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:32,825 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:04:32,825 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:32,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:32,826 INFO L82 PathProgramCache]: Analyzing trace with hash 638595504, now seen corresponding path program 7 times [2021-05-02 12:04:32,826 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:32,826 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1282009286] [2021-05-02 12:04:32,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:32,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:32,916 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:32,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:32,927 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-05-02 12:04:32,927 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:32,927 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1282009286] [2021-05-02 12:04:32,927 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1282009286] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:32,927 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [483125991] [2021-05-02 12:04:32,928 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:04:33,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:33,003 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 12:04:33,011 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:04:33,025 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:33,029 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:33,033 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:33,035 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:33,038 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:33,039 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:33,044 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:33,045 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:33,049 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:33,054 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:33,058 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:33,060 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:33,066 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:33,069 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:33,092 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-05-02 12:04:33,092 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [483125991] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:33,092 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:04:33,092 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2021-05-02 12:04:33,094 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [739455284] [2021-05-02 12:04:33,094 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 12:04:33,095 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:33,095 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 12:04:33,095 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2021-05-02 12:04:33,095 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand has 12 states, 12 states have (on average 2.5) internal successors, (30), 11 states have internal predecessors, (30), 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 12:04:33,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:33,170 INFO L93 Difference]: Finished difference Result 71 states and 74 transitions. [2021-05-02 12:04:33,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 12:04:33,170 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.5) internal successors, (30), 11 states have internal predecessors, (30), 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 42 [2021-05-02 12:04:33,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:33,171 INFO L225 Difference]: With dead ends: 71 [2021-05-02 12:04:33,171 INFO L226 Difference]: Without dead ends: 49 [2021-05-02 12:04:33,171 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 47.1ms TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2021-05-02 12:04:33,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-02 12:04:33,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 47. [2021-05-02 12:04:33,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 42 states have (on average 1.0476190476190477) internal successors, (44), 42 states have internal predecessors, (44), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:04:33,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2021-05-02 12:04:33,174 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 42 [2021-05-02 12:04:33,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:33,174 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2021-05-02 12:04:33,174 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.5) internal successors, (30), 11 states have internal predecessors, (30), 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 12:04:33,174 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2021-05-02 12:04:33,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-02 12:04:33,175 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:33,175 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:33,394 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:04:33,395 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:33,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:33,395 INFO L82 PathProgramCache]: Analyzing trace with hash -548574028, now seen corresponding path program 8 times [2021-05-02 12:04:33,395 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:33,395 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [355206273] [2021-05-02 12:04:33,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:33,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:33,502 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:33,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:33,506 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-02 12:04:33,506 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:33,506 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [355206273] [2021-05-02 12:04:33,506 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [355206273] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:33,506 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [489150113] [2021-05-02 12:04:33,507 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 12:04:33,583 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:04:33,583 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:04:33,584 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 12:04:33,585 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:04:33,602 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:33,604 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:33,607 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:33,609 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:33,612 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:33,613 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:33,617 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:33,618 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:33,622 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:33,624 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:33,627 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:33,629 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:33,632 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:33,634 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:33,637 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:33,638 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:33,659 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-02 12:04:33,659 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [489150113] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:33,660 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:04:33,660 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2021-05-02 12:04:33,660 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [996928361] [2021-05-02 12:04:33,660 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 12:04:33,660 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:33,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 12:04:33,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2021-05-02 12:04:33,661 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand has 13 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 12 states have internal predecessors, (32), 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 12:04:33,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:33,725 INFO L93 Difference]: Finished difference Result 77 states and 80 transitions. [2021-05-02 12:04:33,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 12:04:33,725 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 12 states have internal predecessors, (32), 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 46 [2021-05-02 12:04:33,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:33,726 INFO L225 Difference]: With dead ends: 77 [2021-05-02 12:04:33,726 INFO L226 Difference]: Without dead ends: 53 [2021-05-02 12:04:33,726 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 54.3ms TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2021-05-02 12:04:33,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-02 12:04:33,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 51. [2021-05-02 12:04:33,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 46 states have (on average 1.0434782608695652) internal successors, (48), 46 states have internal predecessors, (48), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:04:33,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2021-05-02 12:04:33,729 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 46 [2021-05-02 12:04:33,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:33,729 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2021-05-02 12:04:33,729 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 12 states have internal predecessors, (32), 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 12:04:33,730 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2021-05-02 12:04:33,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-02 12:04:33,730 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:33,730 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:33,944 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 12:04:33,945 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:33,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:33,945 INFO L82 PathProgramCache]: Analyzing trace with hash 1504351672, now seen corresponding path program 9 times [2021-05-02 12:04:33,945 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:33,945 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [769589340] [2021-05-02 12:04:33,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:33,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:34,049 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:34,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:34,053 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 12:04:34,053 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:34,053 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [769589340] [2021-05-02 12:04:34,053 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [769589340] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:34,054 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [23036185] [2021-05-02 12:04:34,054 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 12:04:34,894 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-05-02 12:04:34,895 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:04:34,899 INFO L263 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 12:04:34,900 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:04:34,951 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:34,957 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:34,964 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:34,965 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:34,969 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:34,970 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:34,973 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:34,974 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:34,977 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:34,979 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:34,984 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:34,985 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:34,992 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:34,993 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:35,001 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:35,002 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:35,008 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:35,009 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:35,016 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 12:04:35,017 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [23036185] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:35,017 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:04:35,017 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2021-05-02 12:04:35,017 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1458439475] [2021-05-02 12:04:35,017 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 12:04:35,017 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:35,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 12:04:35,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2021-05-02 12:04:35,018 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand has 14 states, 14 states have (on average 3.9285714285714284) internal successors, (55), 13 states have internal predecessors, (55), 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 12:04:35,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:35,097 INFO L93 Difference]: Finished difference Result 83 states and 86 transitions. [2021-05-02 12:04:35,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 12:04:35,097 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.9285714285714284) internal successors, (55), 13 states have internal predecessors, (55), 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 50 [2021-05-02 12:04:35,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:35,098 INFO L225 Difference]: With dead ends: 83 [2021-05-02 12:04:35,098 INFO L226 Difference]: Without dead ends: 57 [2021-05-02 12:04:35,098 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 67.6ms TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2021-05-02 12:04:35,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-05-02 12:04:35,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 55. [2021-05-02 12:04:35,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 50 states have (on average 1.04) internal successors, (52), 50 states have internal predecessors, (52), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:04:35,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2021-05-02 12:04:35,102 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 50 [2021-05-02 12:04:35,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:35,102 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2021-05-02 12:04:35,102 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 3.9285714285714284) internal successors, (55), 13 states have internal predecessors, (55), 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 12:04:35,102 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2021-05-02 12:04:35,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-05-02 12:04:35,102 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:35,102 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:35,303 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:04:35,303 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:35,304 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:35,304 INFO L82 PathProgramCache]: Analyzing trace with hash -58938180, now seen corresponding path program 10 times [2021-05-02 12:04:35,304 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:35,304 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [704005583] [2021-05-02 12:04:35,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:35,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:35,412 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:35,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:35,415 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 12:04:35,416 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:35,416 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [704005583] [2021-05-02 12:04:35,416 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [704005583] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:35,416 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [702854126] [2021-05-02 12:04:35,416 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 12:04:35,469 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:04:35,469 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:04:35,470 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-02 12:04:35,472 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:04:35,483 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:35,484 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:35,488 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:35,489 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:35,493 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:35,494 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:35,497 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:35,498 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:35,501 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:35,502 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:35,505 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:35,506 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:35,509 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:35,510 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:35,513 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:35,515 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:35,518 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:35,519 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:35,521 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:35,522 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:35,545 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 12:04:35,545 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [702854126] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:35,545 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:04:35,545 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2021-05-02 12:04:35,545 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [957194485] [2021-05-02 12:04:35,546 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 12:04:35,546 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:35,546 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 12:04:35,546 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2021-05-02 12:04:35,546 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand has 15 states, 15 states have (on average 2.4) internal successors, (36), 14 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 12:04:35,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:35,646 INFO L93 Difference]: Finished difference Result 89 states and 92 transitions. [2021-05-02 12:04:35,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 12:04:35,646 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.4) internal successors, (36), 14 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 54 [2021-05-02 12:04:35,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:35,646 INFO L225 Difference]: With dead ends: 89 [2021-05-02 12:04:35,647 INFO L226 Difference]: Without dead ends: 61 [2021-05-02 12:04:35,647 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 67.4ms TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2021-05-02 12:04:35,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-05-02 12:04:35,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 59. [2021-05-02 12:04:35,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 54 states have (on average 1.037037037037037) internal successors, (56), 54 states have internal predecessors, (56), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:04:35,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2021-05-02 12:04:35,650 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 54 [2021-05-02 12:04:35,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:35,650 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2021-05-02 12:04:35,650 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.4) internal successors, (36), 14 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 12:04:35,650 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2021-05-02 12:04:35,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-02 12:04:35,651 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:35,651 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:35,866 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:04:35,867 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:35,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:35,867 INFO L82 PathProgramCache]: Analyzing trace with hash 764981696, now seen corresponding path program 11 times [2021-05-02 12:04:35,867 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:35,867 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [146506394] [2021-05-02 12:04:35,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:35,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:35,970 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:35,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:35,974 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-05-02 12:04:35,974 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:35,974 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [146506394] [2021-05-02 12:04:35,974 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [146506394] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:35,974 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1061472609] [2021-05-02 12:04:35,974 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 12:05:00,676 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2021-05-02 12:05:00,676 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:05:00,714 INFO L263 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 12:05:00,715 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:05:00,769 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:00,770 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:00,773 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:00,774 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:00,777 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:00,778 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:00,782 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:00,783 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:00,785 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:00,786 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:00,789 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:00,790 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:00,793 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:00,794 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:00,797 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:00,798 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:00,801 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:00,802 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:00,805 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:00,805 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:00,808 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:00,809 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:00,815 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-05-02 12:05:00,815 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1061472609] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:00,815 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:05:00,816 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2021-05-02 12:05:00,816 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [957688281] [2021-05-02 12:05:00,816 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 12:05:00,816 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:05:00,816 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 12:05:00,817 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2021-05-02 12:05:00,817 INFO L87 Difference]: Start difference. First operand 59 states and 60 transitions. Second operand has 16 states, 16 states have (on average 3.9375) internal successors, (63), 15 states have internal predecessors, (63), 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 12:05:00,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:05:00,897 INFO L93 Difference]: Finished difference Result 95 states and 98 transitions. [2021-05-02 12:05:00,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 12:05:00,898 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.9375) internal successors, (63), 15 states have internal predecessors, (63), 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 58 [2021-05-02 12:05:00,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:05:00,899 INFO L225 Difference]: With dead ends: 95 [2021-05-02 12:05:00,899 INFO L226 Difference]: Without dead ends: 65 [2021-05-02 12:05:00,900 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 78.9ms TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2021-05-02 12:05:00,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-02 12:05:00,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 63. [2021-05-02 12:05:00,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 58 states have (on average 1.0344827586206897) internal successors, (60), 58 states have internal predecessors, (60), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:05:00,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2021-05-02 12:05:00,911 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 58 [2021-05-02 12:05:00,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:05:00,911 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2021-05-02 12:05:00,911 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 3.9375) internal successors, (63), 15 states have internal predecessors, (63), 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 12:05:00,911 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2021-05-02 12:05:00,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-05-02 12:05:00,914 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:05:00,914 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:05:01,129 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 12:05:01,129 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:05:01,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:05:01,129 INFO L82 PathProgramCache]: Analyzing trace with hash -783047484, now seen corresponding path program 12 times [2021-05-02 12:05:01,129 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:05:01,129 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [465590578] [2021-05-02 12:05:01,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:05:01,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:01,269 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:05:01,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:01,278 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-05-02 12:05:01,278 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:05:01,278 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [465590578] [2021-05-02 12:05:01,278 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [465590578] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:01,279 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1626094238] [2021-05-02 12:05:01,279 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 12:05:08,664 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-05-02 12:05:08,664 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:05:08,680 INFO L263 TraceCheckSpWp]: Trace formula consists of 264 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-02 12:05:08,682 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:05:08,733 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:08,734 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:08,752 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:08,762 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:08,763 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:08,766 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:08,767 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:08,770 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:08,771 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:08,774 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:08,775 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:08,778 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:08,779 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:08,782 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:08,784 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:08,787 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:08,788 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:08,791 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:08,792 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:08,795 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:08,796 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:08,799 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:08,800 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:08,803 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:08,804 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:08,808 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:08,809 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:08,816 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 23 proven. 144 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-05-02 12:05:08,816 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1626094238] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:08,816 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:05:08,816 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 17] total 19 [2021-05-02 12:05:08,816 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1313118395] [2021-05-02 12:05:08,817 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 12:05:08,817 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:05:08,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 12:05:08,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2021-05-02 12:05:08,818 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand has 19 states, 19 states have (on average 3.6315789473684212) internal successors, (69), 18 states have internal predecessors, (69), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:05:08,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:05:08,911 INFO L93 Difference]: Finished difference Result 103 states and 108 transitions. [2021-05-02 12:05:08,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 12:05:08,911 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.6315789473684212) internal successors, (69), 18 states have internal predecessors, (69), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 62 [2021-05-02 12:05:08,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:05:08,914 INFO L225 Difference]: With dead ends: 103 [2021-05-02 12:05:08,914 INFO L226 Difference]: Without dead ends: 71 [2021-05-02 12:05:08,916 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 133.1ms TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2021-05-02 12:05:08,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-05-02 12:05:08,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2021-05-02 12:05:08,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 66 states have (on average 1.0303030303030303) internal successors, (68), 66 states have internal predecessors, (68), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:05:08,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 72 transitions. [2021-05-02 12:05:08,928 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 72 transitions. Word has length 62 [2021-05-02 12:05:08,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:05:08,928 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 72 transitions. [2021-05-02 12:05:08,928 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 3.6315789473684212) internal successors, (69), 18 states have internal predecessors, (69), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:05:08,928 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 72 transitions. [2021-05-02 12:05:08,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-02 12:05:08,930 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:05:08,930 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:05:09,151 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 12:05:09,151 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:05:09,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:05:09,152 INFO L82 PathProgramCache]: Analyzing trace with hash 2054837452, now seen corresponding path program 13 times [2021-05-02 12:05:09,152 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:05:09,152 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [315863402] [2021-05-02 12:05:09,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:05:09,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:09,302 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:05:09,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:09,305 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-05-02 12:05:09,305 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:05:09,305 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [315863402] [2021-05-02 12:05:09,305 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [315863402] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:09,305 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1910265248] [2021-05-02 12:05:09,305 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:05:09,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:09,377 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-02 12:05:09,378 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:05:09,394 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:09,395 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:09,398 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:09,399 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:09,402 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:09,403 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:09,411 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:09,413 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:09,417 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:09,418 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:09,428 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:09,431 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:09,436 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:09,438 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:09,440 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:09,441 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:09,445 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:09,446 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:09,449 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:09,450 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:09,453 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:09,454 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:09,457 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:09,458 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:09,461 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:09,462 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:09,465 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:09,466 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:09,493 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-05-02 12:05:09,493 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1910265248] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:09,493 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:05:09,493 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2021-05-02 12:05:09,493 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [249249046] [2021-05-02 12:05:09,494 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 12:05:09,494 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:05:09,494 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 12:05:09,494 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2021-05-02 12:05:09,494 INFO L87 Difference]: Start difference. First operand 71 states and 72 transitions. Second operand has 19 states, 19 states have (on average 2.3157894736842106) internal successors, (44), 18 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:05:09,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:05:09,612 INFO L93 Difference]: Finished difference Result 113 states and 116 transitions. [2021-05-02 12:05:09,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 12:05:09,612 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.3157894736842106) internal successors, (44), 18 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 70 [2021-05-02 12:05:09,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:05:09,613 INFO L225 Difference]: With dead ends: 113 [2021-05-02 12:05:09,613 INFO L226 Difference]: Without dead ends: 77 [2021-05-02 12:05:09,613 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 108.8ms TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2021-05-02 12:05:09,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-02 12:05:09,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 75. [2021-05-02 12:05:09,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 70 states have (on average 1.0285714285714285) internal successors, (72), 70 states have internal predecessors, (72), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:05:09,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 76 transitions. [2021-05-02 12:05:09,616 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 76 transitions. Word has length 70 [2021-05-02 12:05:09,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:05:09,616 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 76 transitions. [2021-05-02 12:05:09,616 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 2.3157894736842106) internal successors, (44), 18 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:05:09,616 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 76 transitions. [2021-05-02 12:05:09,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-05-02 12:05:09,616 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:05:09,617 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:05:09,832 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 12:05:09,832 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:05:09,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:05:09,833 INFO L82 PathProgramCache]: Analyzing trace with hash 1091572176, now seen corresponding path program 14 times [2021-05-02 12:05:09,833 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:05:09,833 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [59605985] [2021-05-02 12:05:09,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:05:09,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:09,993 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:05:09,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:09,996 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2021-05-02 12:05:09,996 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:05:09,996 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [59605985] [2021-05-02 12:05:09,996 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [59605985] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:09,996 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1689045458] [2021-05-02 12:05:09,996 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 12:05:10,065 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:05:10,065 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:05:10,067 INFO L263 TraceCheckSpWp]: Trace formula consists of 306 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 12:05:10,068 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:05:10,080 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:10,081 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:10,084 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:10,085 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:10,089 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:10,091 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:10,093 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:10,094 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:10,097 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:10,098 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:10,101 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:10,102 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:10,124 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:10,126 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:10,129 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:10,132 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:10,135 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:10,137 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:10,140 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:10,141 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:10,144 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:10,145 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:10,148 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:10,149 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:10,151 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:10,152 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:10,155 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:10,156 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:10,159 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:10,160 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:10,188 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2021-05-02 12:05:10,189 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1689045458] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:10,189 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:05:10,189 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2021-05-02 12:05:10,189 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [790111656] [2021-05-02 12:05:10,189 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 12:05:10,189 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:05:10,189 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 12:05:10,190 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2021-05-02 12:05:10,190 INFO L87 Difference]: Start difference. First operand 75 states and 76 transitions. Second operand has 20 states, 20 states have (on average 2.3) internal successors, (46), 19 states have internal predecessors, (46), 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 12:05:10,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:05:10,294 INFO L93 Difference]: Finished difference Result 119 states and 122 transitions. [2021-05-02 12:05:10,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 12:05:10,294 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.3) internal successors, (46), 19 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 74 [2021-05-02 12:05:10,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:05:10,295 INFO L225 Difference]: With dead ends: 119 [2021-05-02 12:05:10,295 INFO L226 Difference]: Without dead ends: 81 [2021-05-02 12:05:10,295 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 115.5ms TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2021-05-02 12:05:10,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-05-02 12:05:10,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 79. [2021-05-02 12:05:10,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 74 states have (on average 1.027027027027027) internal successors, (76), 74 states have internal predecessors, (76), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:05:10,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 80 transitions. [2021-05-02 12:05:10,299 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 80 transitions. Word has length 74 [2021-05-02 12:05:10,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:05:10,300 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 80 transitions. [2021-05-02 12:05:10,300 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 2.3) internal successors, (46), 19 states have internal predecessors, (46), 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 12:05:10,300 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 80 transitions. [2021-05-02 12:05:10,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-05-02 12:05:10,300 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:05:10,300 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:05:10,518 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:05:10,518 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:05:10,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:05:10,519 INFO L82 PathProgramCache]: Analyzing trace with hash -57099052, now seen corresponding path program 15 times [2021-05-02 12:05:10,519 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:05:10,519 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [685837636] [2021-05-02 12:05:10,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:05:10,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:10,682 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:05:10,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:10,685 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2021-05-02 12:05:10,685 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:05:10,685 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [685837636] [2021-05-02 12:05:10,685 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [685837636] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:10,685 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1933168323] [2021-05-02 12:05:10,685 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 12:05:24,334 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2021-05-02 12:05:24,334 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:05:24,356 INFO L263 TraceCheckSpWp]: Trace formula consists of 320 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 12:05:24,358 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:05:24,370 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:24,371 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:24,374 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:24,375 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:24,378 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:24,379 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:24,381 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:24,382 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:24,385 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:24,386 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:24,388 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:24,389 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:24,392 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:24,393 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:24,395 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:24,396 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:24,399 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:24,400 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:24,402 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:24,403 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:24,406 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:24,407 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:24,410 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:24,411 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:24,433 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:24,434 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:24,437 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:24,438 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:24,440 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:24,441 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:24,444 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:24,445 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:24,473 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2021-05-02 12:05:24,473 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1933168323] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:24,474 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:05:24,474 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2021-05-02 12:05:24,474 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1039336266] [2021-05-02 12:05:24,474 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 12:05:24,474 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:05:24,475 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 12:05:24,475 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2021-05-02 12:05:24,475 INFO L87 Difference]: Start difference. First operand 79 states and 80 transitions. Second operand has 21 states, 21 states have (on average 2.2857142857142856) internal successors, (48), 20 states have internal predecessors, (48), 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 12:05:24,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:05:24,573 INFO L93 Difference]: Finished difference Result 125 states and 128 transitions. [2021-05-02 12:05:24,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 12:05:24,573 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.2857142857142856) internal successors, (48), 20 states have internal predecessors, (48), 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 78 [2021-05-02 12:05:24,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:05:24,574 INFO L225 Difference]: With dead ends: 125 [2021-05-02 12:05:24,574 INFO L226 Difference]: Without dead ends: 85 [2021-05-02 12:05:24,574 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 129.2ms TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2021-05-02 12:05:24,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-05-02 12:05:24,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 83. [2021-05-02 12:05:24,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 78 states have (on average 1.0256410256410255) internal successors, (80), 78 states have internal predecessors, (80), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:05:24,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 84 transitions. [2021-05-02 12:05:24,577 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 84 transitions. Word has length 78 [2021-05-02 12:05:24,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:05:24,577 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 84 transitions. [2021-05-02 12:05:24,577 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 2.2857142857142856) internal successors, (48), 20 states have internal predecessors, (48), 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 12:05:24,577 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 84 transitions. [2021-05-02 12:05:24,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-02 12:05:24,577 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:05:24,577 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:05:24,792 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 12:05:24,793 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:05:24,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:05:24,793 INFO L82 PathProgramCache]: Analyzing trace with hash -1981196840, now seen corresponding path program 16 times [2021-05-02 12:05:24,793 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:05:24,793 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [715736017] [2021-05-02 12:05:24,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:05:24,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:24,962 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:05:24,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:24,964 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2021-05-02 12:05:24,965 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:05:24,965 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [715736017] [2021-05-02 12:05:24,965 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [715736017] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:24,965 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [972966346] [2021-05-02 12:05:24,965 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:05:25,030 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:05:25,030 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:05:25,031 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 12:05:25,032 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:05:25,046 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:25,047 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:25,053 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:25,054 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:25,058 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:25,061 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:25,070 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:25,073 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:25,077 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:25,078 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:25,081 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:25,082 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:25,085 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:25,086 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:25,089 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:25,090 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:25,093 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:25,094 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:25,096 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:25,097 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:25,100 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:25,101 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:25,104 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:25,105 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:25,107 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:25,108 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:25,111 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:25,112 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:25,115 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:25,129 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:25,132 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:25,134 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:25,137 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:25,138 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:25,171 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2021-05-02 12:05:25,171 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [972966346] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:25,171 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:05:25,171 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2021-05-02 12:05:25,171 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1636308748] [2021-05-02 12:05:25,172 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 12:05:25,172 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:05:25,172 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 12:05:25,172 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2021-05-02 12:05:25,172 INFO L87 Difference]: Start difference. First operand 83 states and 84 transitions. Second operand has 22 states, 22 states have (on average 2.272727272727273) internal successors, (50), 21 states have internal predecessors, (50), 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 12:05:25,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:05:25,297 INFO L93 Difference]: Finished difference Result 131 states and 134 transitions. [2021-05-02 12:05:25,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-02 12:05:25,298 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.272727272727273) internal successors, (50), 21 states have internal predecessors, (50), 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 82 [2021-05-02 12:05:25,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:05:25,298 INFO L225 Difference]: With dead ends: 131 [2021-05-02 12:05:25,298 INFO L226 Difference]: Without dead ends: 89 [2021-05-02 12:05:25,299 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 133.1ms TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2021-05-02 12:05:25,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-05-02 12:05:25,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 87. [2021-05-02 12:05:25,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 82 states have (on average 1.024390243902439) internal successors, (84), 82 states have internal predecessors, (84), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:05:25,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 88 transitions. [2021-05-02 12:05:25,301 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 88 transitions. Word has length 82 [2021-05-02 12:05:25,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:05:25,301 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 88 transitions. [2021-05-02 12:05:25,301 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.272727272727273) internal successors, (50), 21 states have internal predecessors, (50), 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 12:05:25,301 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 88 transitions. [2021-05-02 12:05:25,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-05-02 12:05:25,302 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:05:25,302 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:05:25,517 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 12:05:25,517 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:05:25,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:05:25,518 INFO L82 PathProgramCache]: Analyzing trace with hash 1146543324, now seen corresponding path program 17 times [2021-05-02 12:05:25,518 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:05:25,518 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1348317744] [2021-05-02 12:05:25,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:05:25,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:25,700 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:05:25,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:25,703 INFO L134 CoverageAnalysis]: Checked inductivity of 648 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 324 trivial. 0 not checked. [2021-05-02 12:05:25,703 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:05:25,703 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1348317744] [2021-05-02 12:05:25,703 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1348317744] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:25,703 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2124716231] [2021-05-02 12:05:25,703 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true