/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/heavy-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 11:49:46,731 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 11:49:46,733 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 11:49:46,767 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 11:49:46,840 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 11:49:46,841 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 11:49:46,841 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 11:49:46,842 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2021-05-02 11:49:46,880 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 11:49:46,880 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 11:49:46,881 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 11:49:46,881 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 11:49:46,881 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 11:49:46,881 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 11:49:46,882 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 11:49:46,882 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 11:49:46,882 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 11:49:46,882 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 11:49:46,882 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 11:49:46,882 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 11:49:46,882 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 11:49:46,882 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 11:49:46,882 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 11:49:46,883 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 11:49:46,883 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 11:49:46,883 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 11:49:46,883 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 11:49:46,883 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 11:49:46,883 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 11:49:46,883 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 11:49:46,883 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 11:49:46,883 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 11:49:46,884 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 11:49:46,884 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 11:49:46,884 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 11:49:46,884 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 11:49:46,884 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 11:49:47,135 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 11:49:47,148 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 11:49:47,150 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 11:49:47,151 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 11:49:47,151 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 11:49:47,151 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/heavy-1.c [2021-05-02 11:49:47,198 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b2137a350/5fa916c4d41f4a7183e810af0b54f155/FLAG1e9546263 [2021-05-02 11:49:47,541 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 11:49:47,543 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/heavy-1.c [2021-05-02 11:49:47,547 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b2137a350/5fa916c4d41f4a7183e810af0b54f155/FLAG1e9546263 [2021-05-02 11:49:47,968 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b2137a350/5fa916c4d41f4a7183e810af0b54f155 [2021-05-02 11:49:47,970 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 11:49:47,971 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 11:49:47,972 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 11:49:47,972 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 11:49:47,991 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 11:49:47,992 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 11:49:47" (1/1) ... [2021-05-02 11:49:47,993 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@402571ad and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:47, skipping insertion in model container [2021-05-02 11:49:47,993 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 11:49:47" (1/1) ... [2021-05-02 11:49:47,998 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 11:49:48,007 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 11:49:48,089 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/heavy-1.c[600,613] [2021-05-02 11:49:48,091 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 11:49:48,135 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 11:49:48,159 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/heavy-1.c[600,613] [2021-05-02 11:49:48,171 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 11:49:48,201 INFO L208 MainTranslator]: Completed translation [2021-05-02 11:49:48,202 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:48 WrapperNode [2021-05-02 11:49:48,202 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 11:49:48,202 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 11:49:48,202 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 11:49:48,204 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 11:49:48,210 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:48" (1/1) ... [2021-05-02 11:49:48,211 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:48" (1/1) ... [2021-05-02 11:49:48,216 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:48" (1/1) ... [2021-05-02 11:49:48,216 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:48" (1/1) ... [2021-05-02 11:49:48,227 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:48" (1/1) ... [2021-05-02 11:49:48,230 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:48" (1/1) ... [2021-05-02 11:49:48,234 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:48" (1/1) ... [2021-05-02 11:49:48,236 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 11:49:48,238 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 11:49:48,238 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 11:49:48,238 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 11:49:48,238 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:48" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 11:49:48,293 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 11:49:48,293 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 11:49:48,293 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 11:49:48,293 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 11:49:48,294 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 11:49:48,294 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 11:49:48,294 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 11:49:48,294 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 11:49:48,294 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 11:49:48,295 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 11:49:48,295 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 11:49:48,295 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 11:49:48,295 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 11:49:48,295 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2021-05-02 11:49:48,296 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 11:49:48,296 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 11:49:48,559 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 11:49:48,560 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2021-05-02 11:49:48,561 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 11:49:48 BoogieIcfgContainer [2021-05-02 11:49:48,561 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 11:49:48,562 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 11:49:48,562 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 11:49:48,564 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 11:49:48,564 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 11:49:47" (1/3) ... [2021-05-02 11:49:48,564 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2a31a8c6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 11:49:48, skipping insertion in model container [2021-05-02 11:49:48,564 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:48" (2/3) ... [2021-05-02 11:49:48,565 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2a31a8c6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 11:49:48, skipping insertion in model container [2021-05-02 11:49:48,565 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 11:49:48" (3/3) ... [2021-05-02 11:49:48,566 INFO L111 eAbstractionObserver]: Analyzing ICFG heavy-1.c [2021-05-02 11:49:48,570 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 11:49:48,572 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 11:49:48,584 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 11:49:48,599 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 11:49:48,599 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 11:49:48,599 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 11:49:48,599 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 11:49:48,599 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 11:49:48,599 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 11:49:48,599 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 11:49:48,600 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 11:49:48,610 INFO L276 IsEmpty]: Start isEmpty. Operand has 19 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 14 states have internal predecessors, (21), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 11:49:48,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-05-02 11:49:48,613 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:48,614 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:48,614 INFO L428 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:48,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:48,618 INFO L82 PathProgramCache]: Analyzing trace with hash 1947864061, now seen corresponding path program 1 times [2021-05-02 11:49:48,624 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:48,624 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2047707065] [2021-05-02 11:49:48,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:48,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:48,829 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:48,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:48,860 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:49:48,861 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:48,861 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2047707065] [2021-05-02 11:49:48,862 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2047707065] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 11:49:48,862 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 11:49:48,862 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 11:49:48,862 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1071661298] [2021-05-02 11:49:48,865 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 11:49:48,865 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:49:48,882 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 11:49:48,883 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 11:49:48,884 INFO L87 Difference]: Start difference. First operand has 19 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 14 states have internal predecessors, (21), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:48,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:49:48,974 INFO L93 Difference]: Finished difference Result 42 states and 61 transitions. [2021-05-02 11:49:48,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 11:49:48,975 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9 [2021-05-02 11:49:48,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:49:48,980 INFO L225 Difference]: With dead ends: 42 [2021-05-02 11:49:48,981 INFO L226 Difference]: Without dead ends: 23 [2021-05-02 11:49:48,983 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 66.9ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 11:49:48,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-02 11:49:49,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 15. [2021-05-02 11:49:49,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 11 states have internal predecessors, (14), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:49,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2021-05-02 11:49:49,009 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 9 [2021-05-02 11:49:49,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:49:49,009 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2021-05-02 11:49:49,009 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:49,009 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2021-05-02 11:49:49,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-05-02 11:49:49,010 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:49,010 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:49,011 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 11:49:49,011 INFO L428 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:49,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:49,013 INFO L82 PathProgramCache]: Analyzing trace with hash 1947835231, now seen corresponding path program 1 times [2021-05-02 11:49:49,013 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:49,013 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1461307073] [2021-05-02 11:49:49,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:49,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:49,119 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:49,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:49,130 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:49:49,130 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:49,131 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1461307073] [2021-05-02 11:49:49,131 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1461307073] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 11:49:49,131 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 11:49:49,131 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 11:49:49,131 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [746433472] [2021-05-02 11:49:49,132 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 11:49:49,132 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:49:49,132 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 11:49:49,133 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 11:49:49,133 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:49,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:49:49,229 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2021-05-02 11:49:49,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 11:49:49,230 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9 [2021-05-02 11:49:49,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:49:49,232 INFO L225 Difference]: With dead ends: 36 [2021-05-02 11:49:49,232 INFO L226 Difference]: Without dead ends: 33 [2021-05-02 11:49:49,233 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 74.3ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 11:49:49,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-02 11:49:49,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 16. [2021-05-02 11:49:49,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:49,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2021-05-02 11:49:49,244 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 9 [2021-05-02 11:49:49,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:49:49,244 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2021-05-02 11:49:49,245 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:49,245 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2021-05-02 11:49:49,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-02 11:49:49,245 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:49,246 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:49,246 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 11:49:49,247 INFO L428 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:49,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:49,247 INFO L82 PathProgramCache]: Analyzing trace with hash -1310776898, now seen corresponding path program 1 times [2021-05-02 11:49:49,247 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:49,248 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [544982727] [2021-05-02 11:49:49,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:49,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:49,329 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:49,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:49,361 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:49:49,362 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:49,362 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [544982727] [2021-05-02 11:49:49,362 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [544982727] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 11:49:49,362 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 11:49:49,362 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 11:49:49,362 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [277560637] [2021-05-02 11:49:49,363 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 11:49:49,363 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:49:49,363 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 11:49:49,363 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 11:49:49,363 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:49,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:49:49,441 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2021-05-02 11:49:49,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 11:49:49,441 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-02 11:49:49,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:49:49,442 INFO L225 Difference]: With dead ends: 40 [2021-05-02 11:49:49,442 INFO L226 Difference]: Without dead ends: 31 [2021-05-02 11:49:49,443 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 58.1ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 11:49:49,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-05-02 11:49:49,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 17. [2021-05-02 11:49:49,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 13 states have internal predecessors, (16), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:49,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2021-05-02 11:49:49,449 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2021-05-02 11:49:49,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:49:49,449 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2021-05-02 11:49:49,449 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:49,449 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2021-05-02 11:49:49,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 11:49:49,450 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:49,450 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:49,450 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 11:49:49,450 INFO L428 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:49,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:49,450 INFO L82 PathProgramCache]: Analyzing trace with hash -1718535333, now seen corresponding path program 1 times [2021-05-02 11:49:49,451 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:49,451 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1191127547] [2021-05-02 11:49:49,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:49,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:49,507 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:49,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:49,517 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:49:49,517 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:49,517 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1191127547] [2021-05-02 11:49:49,517 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1191127547] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 11:49:49,518 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 11:49:49,518 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 11:49:49,518 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1548032799] [2021-05-02 11:49:49,518 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 11:49:49,518 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:49:49,519 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 11:49:49,520 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 11:49:49,520 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:49,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:49:49,583 INFO L93 Difference]: Finished difference Result 31 states and 37 transitions. [2021-05-02 11:49:49,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 11:49:49,583 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-05-02 11:49:49,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:49:49,584 INFO L225 Difference]: With dead ends: 31 [2021-05-02 11:49:49,584 INFO L226 Difference]: Without dead ends: 21 [2021-05-02 11:49:49,585 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 47.7ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 11:49:49,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-05-02 11:49:49,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2021-05-02 11:49:49,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:49,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2021-05-02 11:49:49,590 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 15 [2021-05-02 11:49:49,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:49:49,591 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2021-05-02 11:49:49,591 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:49,591 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2021-05-02 11:49:49,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 11:49:49,592 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:49,592 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:49,592 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-02 11:49:49,592 INFO L428 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:49,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:49,592 INFO L82 PathProgramCache]: Analyzing trace with hash -1543508103, now seen corresponding path program 1 times [2021-05-02 11:49:49,593 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:49,593 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [363781049] [2021-05-02 11:49:49,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:49,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:49,699 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:49,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:49,715 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:49:49,722 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:49,742 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [363781049] [2021-05-02 11:49:49,742 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [363781049] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:49,742 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [889930961] [2021-05-02 11:49:49,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:49:49,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:49,785 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 11:49:49,787 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:49:49,827 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:49:49,827 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [889930961] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:49,827 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:49:49,827 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-02 11:49:49,828 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1778379342] [2021-05-02 11:49:49,828 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 11:49:49,828 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:49:49,828 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 11:49:49,828 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 11:49:49,829 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:49,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:49:49,890 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2021-05-02 11:49:49,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 11:49:49,890 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-02 11:49:49,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:49:49,891 INFO L225 Difference]: With dead ends: 34 [2021-05-02 11:49:49,891 INFO L226 Difference]: Without dead ends: 23 [2021-05-02 11:49:49,891 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 65.8ms TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-05-02 11:49:49,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-02 11:49:49,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2021-05-02 11:49:49,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:49,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2021-05-02 11:49:49,894 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 17 [2021-05-02 11:49:49,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:49:49,894 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2021-05-02 11:49:49,894 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:49,894 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2021-05-02 11:49:49,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-02 11:49:49,894 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:49,895 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:50,110 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:49:50,112 INFO L428 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:50,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:50,113 INFO L82 PathProgramCache]: Analyzing trace with hash -846064617, now seen corresponding path program 2 times [2021-05-02 11:49:50,113 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:50,113 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [605319242] [2021-05-02 11:49:50,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:50,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:50,183 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:50,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:50,194 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:49:50,194 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:50,194 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [605319242] [2021-05-02 11:49:50,194 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [605319242] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:50,194 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1063022946] [2021-05-02 11:49:50,195 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:49:50,239 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 11:49:50,239 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:49:50,240 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 11:49:50,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:49:50,314 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 11:49:50,315 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1063022946] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:50,315 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:49:50,315 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 10 [2021-05-02 11:49:50,315 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2089895994] [2021-05-02 11:49:50,315 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 11:49:50,315 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:49:50,316 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 11:49:50,316 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-05-02 11:49:50,316 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand has 10 states, 10 states have (on average 2.9) internal successors, (29), 9 states have internal predecessors, (29), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:50,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:49:50,505 INFO L93 Difference]: Finished difference Result 62 states and 74 transitions. [2021-05-02 11:49:50,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 11:49:50,506 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.9) internal successors, (29), 9 states have internal predecessors, (29), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2021-05-02 11:49:50,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:49:50,506 INFO L225 Difference]: With dead ends: 62 [2021-05-02 11:49:50,506 INFO L226 Difference]: Without dead ends: 49 [2021-05-02 11:49:50,507 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 156.8ms TimeCoverageRelationStatistics Valid=60, Invalid=180, Unknown=0, NotChecked=0, Total=240 [2021-05-02 11:49:50,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-02 11:49:50,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 34. [2021-05-02 11:49:50,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 30 states have (on average 1.1666666666666667) internal successors, (35), 30 states have internal predecessors, (35), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:50,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 38 transitions. [2021-05-02 11:49:50,512 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 38 transitions. Word has length 19 [2021-05-02 11:49:50,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:49:50,512 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 38 transitions. [2021-05-02 11:49:50,512 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.9) internal successors, (29), 9 states have internal predecessors, (29), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:50,512 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 38 transitions. [2021-05-02 11:49:50,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-02 11:49:50,513 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:50,513 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:50,728 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:49:50,728 INFO L428 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:50,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:50,728 INFO L82 PathProgramCache]: Analyzing trace with hash -330471925, now seen corresponding path program 3 times [2021-05-02 11:49:50,729 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:50,729 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1009320711] [2021-05-02 11:49:50,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:50,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:50,832 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:50,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:50,838 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 30 proven. 9 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 11:49:50,838 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:50,838 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1009320711] [2021-05-02 11:49:50,838 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1009320711] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:50,838 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1534500490] [2021-05-02 11:49:50,838 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 11:49:51,141 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-05-02 11:49:51,142 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:49:51,143 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-02 11:49:51,145 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:49:51,242 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:51,255 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 32 proven. 10 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 11:49:51,255 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1534500490] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:51,255 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:49:51,255 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2021-05-02 11:49:51,256 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1758519556] [2021-05-02 11:49:51,256 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 11:49:51,256 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:49:51,256 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 11:49:51,256 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-05-02 11:49:51,257 INFO L87 Difference]: Start difference. First operand 34 states and 38 transitions. Second operand has 9 states, 9 states have (on average 3.888888888888889) internal successors, (35), 8 states have internal predecessors, (35), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:51,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:49:51,420 INFO L93 Difference]: Finished difference Result 67 states and 77 transitions. [2021-05-02 11:49:51,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 11:49:51,420 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.888888888888889) internal successors, (35), 8 states have internal predecessors, (35), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 33 [2021-05-02 11:49:51,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:49:51,421 INFO L225 Difference]: With dead ends: 67 [2021-05-02 11:49:51,421 INFO L226 Difference]: Without dead ends: 41 [2021-05-02 11:49:51,421 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 30 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 165.8ms TimeCoverageRelationStatistics Valid=51, Invalid=159, Unknown=0, NotChecked=0, Total=210 [2021-05-02 11:49:51,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-05-02 11:49:51,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 38. [2021-05-02 11:49:51,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 34 states have (on average 1.1470588235294117) internal successors, (39), 34 states have internal predecessors, (39), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:51,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 42 transitions. [2021-05-02 11:49:51,425 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 42 transitions. Word has length 33 [2021-05-02 11:49:51,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:49:51,425 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 42 transitions. [2021-05-02 11:49:51,425 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.888888888888889) internal successors, (35), 8 states have internal predecessors, (35), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:51,425 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 42 transitions. [2021-05-02 11:49:51,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-02 11:49:51,426 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:51,426 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:51,630 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:49:51,630 INFO L428 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:51,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:51,631 INFO L82 PathProgramCache]: Analyzing trace with hash -967465145, now seen corresponding path program 4 times [2021-05-02 11:49:51,631 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:51,631 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [88113659] [2021-05-02 11:49:51,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:51,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:51,731 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:51,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:51,737 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 46 proven. 16 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-05-02 11:49:51,737 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:51,737 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [88113659] [2021-05-02 11:49:51,737 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [88113659] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:51,737 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2042874003] [2021-05-02 11:49:51,738 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 11:49:51,783 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 11:49:51,783 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:49:51,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 11:49:51,785 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:49:51,893 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-05-02 11:49:51,894 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2042874003] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:51,894 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:49:51,894 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2021-05-02 11:49:51,894 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1232136065] [2021-05-02 11:49:51,894 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 11:49:51,894 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:49:51,894 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 11:49:51,895 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2021-05-02 11:49:51,895 INFO L87 Difference]: Start difference. First operand 38 states and 42 transitions. Second operand has 14 states, 14 states have (on average 3.5) internal successors, (49), 13 states have internal predecessors, (49), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:52,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:49:52,317 INFO L93 Difference]: Finished difference Result 108 states and 125 transitions. [2021-05-02 11:49:52,318 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-02 11:49:52,318 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.5) internal successors, (49), 13 states have internal predecessors, (49), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 37 [2021-05-02 11:49:52,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:49:52,318 INFO L225 Difference]: With dead ends: 108 [2021-05-02 11:49:52,318 INFO L226 Difference]: Without dead ends: 78 [2021-05-02 11:49:52,319 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 151 ImplicationChecksByTransitivity, 280.2ms TimeCoverageRelationStatistics Valid=120, Invalid=636, Unknown=0, NotChecked=0, Total=756 [2021-05-02 11:49:52,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-05-02 11:49:52,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 58. [2021-05-02 11:49:52,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 54 states have (on average 1.1296296296296295) internal successors, (61), 54 states have internal predecessors, (61), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:52,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 64 transitions. [2021-05-02 11:49:52,324 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 64 transitions. Word has length 37 [2021-05-02 11:49:52,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:49:52,324 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 64 transitions. [2021-05-02 11:49:52,324 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 3.5) internal successors, (49), 13 states have internal predecessors, (49), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:52,325 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 64 transitions. [2021-05-02 11:49:52,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-02 11:49:52,325 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:52,325 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:52,540 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:49:52,541 INFO L428 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:52,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:52,541 INFO L82 PathProgramCache]: Analyzing trace with hash 761285653, now seen corresponding path program 5 times [2021-05-02 11:49:52,541 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:52,541 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2012992245] [2021-05-02 11:49:52,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:52,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:52,644 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:52,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:52,649 INFO L134 CoverageAnalysis]: Checked inductivity of 285 backedges. 130 proven. 25 refuted. 0 times theorem prover too weak. 130 trivial. 0 not checked. [2021-05-02 11:49:52,649 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:52,649 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2012992245] [2021-05-02 11:49:52,649 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2012992245] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:52,649 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1907234368] [2021-05-02 11:49:52,649 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 11:49:52,712 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-05-02 11:49:52,712 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:49:52,713 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 11:49:52,715 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:49:52,825 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:52,861 INFO L134 CoverageAnalysis]: Checked inductivity of 285 backedges. 200 proven. 25 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-05-02 11:49:52,861 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1907234368] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:52,861 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:49:52,861 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-02 11:49:52,862 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1553737815] [2021-05-02 11:49:52,862 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 11:49:52,862 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:49:52,862 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 11:49:52,862 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-05-02 11:49:52,863 INFO L87 Difference]: Start difference. First operand 58 states and 64 transitions. Second operand has 10 states, 10 states have (on average 3.7) internal successors, (37), 9 states have internal predecessors, (37), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:52,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:49:52,999 INFO L93 Difference]: Finished difference Result 118 states and 133 transitions. [2021-05-02 11:49:52,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 11:49:53,000 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.7) internal successors, (37), 9 states have internal predecessors, (37), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 57 [2021-05-02 11:49:53,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:49:53,000 INFO L225 Difference]: With dead ends: 118 [2021-05-02 11:49:53,000 INFO L226 Difference]: Without dead ends: 68 [2021-05-02 11:49:53,001 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 56 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 96.4ms TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-05-02 11:49:53,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-05-02 11:49:53,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 64. [2021-05-02 11:49:53,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 60 states have (on average 1.1166666666666667) internal successors, (67), 60 states have internal predecessors, (67), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:53,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 70 transitions. [2021-05-02 11:49:53,006 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 70 transitions. Word has length 57 [2021-05-02 11:49:53,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:49:53,007 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 70 transitions. [2021-05-02 11:49:53,007 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.7) internal successors, (37), 9 states have internal predecessors, (37), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:53,007 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 70 transitions. [2021-05-02 11:49:53,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-02 11:49:53,008 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:53,008 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:53,208 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:49:53,208 INFO L428 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:53,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:53,209 INFO L82 PathProgramCache]: Analyzing trace with hash 1747085295, now seen corresponding path program 6 times [2021-05-02 11:49:53,209 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:53,209 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [522194474] [2021-05-02 11:49:53,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:53,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:53,340 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:53,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:53,343 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 178 proven. 36 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2021-05-02 11:49:53,343 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:53,343 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [522194474] [2021-05-02 11:49:53,344 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [522194474] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:53,344 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [389319155] [2021-05-02 11:49:53,344 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 11:49:53,939 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 14 check-sat command(s) [2021-05-02 11:49:53,939 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:49:53,941 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 11:49:53,943 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:49:54,025 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 183 proven. 1 refuted. 0 times theorem prover too weak. 206 trivial. 0 not checked. [2021-05-02 11:49:54,025 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [389319155] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:54,025 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:49:54,025 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 4] total 12 [2021-05-02 11:49:54,026 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [350979270] [2021-05-02 11:49:54,026 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 11:49:54,026 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:49:54,026 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 11:49:54,026 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2021-05-02 11:49:54,027 INFO L87 Difference]: Start difference. First operand 64 states and 70 transitions. Second operand has 12 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 11 states have internal predecessors, (37), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:54,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:49:54,461 INFO L93 Difference]: Finished difference Result 234 states and 264 transitions. [2021-05-02 11:49:54,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-02 11:49:54,461 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 11 states have internal predecessors, (37), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 63 [2021-05-02 11:49:54,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:49:54,462 INFO L225 Difference]: With dead ends: 234 [2021-05-02 11:49:54,462 INFO L226 Difference]: Without dead ends: 178 [2021-05-02 11:49:54,464 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 122 ImplicationChecksByTransitivity, 256.1ms TimeCoverageRelationStatistics Valid=120, Invalid=636, Unknown=0, NotChecked=0, Total=756 [2021-05-02 11:49:54,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2021-05-02 11:49:54,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 121. [2021-05-02 11:49:54,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 117 states have (on average 1.0854700854700854) internal successors, (127), 117 states have internal predecessors, (127), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:54,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 130 transitions. [2021-05-02 11:49:54,506 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 130 transitions. Word has length 63 [2021-05-02 11:49:54,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:49:54,506 INFO L480 AbstractCegarLoop]: Abstraction has 121 states and 130 transitions. [2021-05-02 11:49:54,506 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 11 states have internal predecessors, (37), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:54,506 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 130 transitions. [2021-05-02 11:49:54,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2021-05-02 11:49:54,507 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:54,507 INFO L523 BasicCegarLoop]: trace histogram [42, 42, 6, 6, 6, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:54,712 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:49:54,713 INFO L428 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:54,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:54,713 INFO L82 PathProgramCache]: Analyzing trace with hash 1915293246, now seen corresponding path program 7 times [2021-05-02 11:49:54,713 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:54,713 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1628429438] [2021-05-02 11:49:54,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:54,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:54,884 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:54,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:54,890 INFO L134 CoverageAnalysis]: Checked inductivity of 2049 backedges. 576 proven. 49 refuted. 0 times theorem prover too weak. 1424 trivial. 0 not checked. [2021-05-02 11:49:54,890 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:54,890 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1628429438] [2021-05-02 11:49:54,890 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1628429438] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:54,890 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2073137121] [2021-05-02 11:49:54,890 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 11:49:54,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:54,970 INFO L263 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 11:49:54,973 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:49:55,167 INFO L134 CoverageAnalysis]: Checked inductivity of 2049 backedges. 933 proven. 146 refuted. 0 times theorem prover too weak. 970 trivial. 0 not checked. [2021-05-02 11:49:55,167 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2073137121] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:55,167 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:49:55,167 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8] total 17 [2021-05-02 11:49:55,167 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1524791844] [2021-05-02 11:49:55,168 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 11:49:55,168 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:49:55,168 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 11:49:55,168 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=225, Unknown=0, NotChecked=0, Total=272 [2021-05-02 11:49:55,168 INFO L87 Difference]: Start difference. First operand 121 states and 130 transitions. Second operand has 17 states, 17 states have (on average 2.8823529411764706) internal successors, (49), 16 states have internal predecessors, (49), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:55,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:49:55,943 INFO L93 Difference]: Finished difference Result 354 states and 392 transitions. [2021-05-02 11:49:55,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-02 11:49:55,944 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.8823529411764706) internal successors, (49), 16 states have internal predecessors, (49), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 120 [2021-05-02 11:49:55,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:49:55,944 INFO L225 Difference]: With dead ends: 354 [2021-05-02 11:49:55,944 INFO L226 Difference]: Without dead ends: 256 [2021-05-02 11:49:55,945 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 340 ImplicationChecksByTransitivity, 433.6ms TimeCoverageRelationStatistics Valid=183, Invalid=1377, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 11:49:55,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2021-05-02 11:49:55,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 190. [2021-05-02 11:49:55,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 190 states, 186 states have (on average 1.0698924731182795) internal successors, (199), 186 states have internal predecessors, (199), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:55,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 202 transitions. [2021-05-02 11:49:55,955 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 202 transitions. Word has length 120 [2021-05-02 11:49:55,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:49:55,955 INFO L480 AbstractCegarLoop]: Abstraction has 190 states and 202 transitions. [2021-05-02 11:49:55,955 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.8823529411764706) internal successors, (49), 16 states have internal predecessors, (49), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:55,955 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 202 transitions. [2021-05-02 11:49:55,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2021-05-02 11:49:55,956 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:55,956 INFO L523 BasicCegarLoop]: trace histogram [72, 72, 9, 9, 9, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:56,173 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:49:56,173 INFO L428 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:56,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:56,173 INFO L82 PathProgramCache]: Analyzing trace with hash 1297849731, now seen corresponding path program 8 times [2021-05-02 11:49:56,173 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:56,174 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [922872918] [2021-05-02 11:49:56,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:56,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:56,413 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:56,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:56,419 INFO L134 CoverageAnalysis]: Checked inductivity of 5907 backedges. 1174 proven. 64 refuted. 0 times theorem prover too weak. 4669 trivial. 0 not checked. [2021-05-02 11:49:56,419 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:56,419 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [922872918] [2021-05-02 11:49:56,419 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [922872918] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:56,420 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [298902010] [2021-05-02 11:49:56,420 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